i2c-s3c2410.c revision 069a9502dd7c51cf2f9031cd86d88774c696101c
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* linux/drivers/i2c/busses/i2c-s3c2410.c 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone * Copyright (C) 2004,2005,2009 Simtec Electronics 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Ben Dooks <ben@simtec.co.uk> 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * S3C2410 I2C Controller 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it under the terms of the GNU General Public License as published by 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (at your option) any later version. 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is distributed in the hope that it will be useful, 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * GNU General Public License for more details. 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * You should have received a copy of the GNU General Public License 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * along with this program; if not, write to the Free Software 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/i2c.h> 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/time.h> 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/interrupt.h> 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/delay.h> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/err.h> 33d052d1beff706920e82c5d55006b08e256b5df09Russell King#include <linux/platform_device.h> 34c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown#include <linux/pm_runtime.h> 35f8ce25476d5f12ffa29b885e49c38cd95053437eRussell King#include <linux/clk.h> 3661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#include <linux/cpufreq.h> 375a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 382178218027e4da0608219fae1d02e5c88f4e560dH Hartley Sweeten#include <linux/io.h> 394edd65e63fe4a998164a8d7d8c8c86f4300825d7Sachin Kamat#include <linux/of.h> 405a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#include <linux/of_gpio.h> 412693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa#include <linux/pinctrl/consumer.h> 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/irq.h> 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 45436d42c61c3eef1d02256174c8615046c61a28adArnd Bergmann#include <linux/platform_data/i2c-s3c2410.h> 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 47e636602ac2613da8c1777cb42443223994be4107Heiko Stübner/* see s3c2410x user guide, v1.1, section 9 (p447) for more info */ 48e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 497a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON 0x00 507a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT 0x04 517a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICADD 0x08 527a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICDS 0x0C 537a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2440_IICLC 0x10 54e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 557a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_ACKEN (1 << 7) 567a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_TXDIV_16 (0 << 6) 577a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_TXDIV_512 (1 << 6) 587a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_IRQEN (1 << 5) 597a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_IRQPEND (1 << 4) 607a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICCON_SCALE(x) ((x) & 0xf) 61e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICCON_SCALEMASK (0xf) 62e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 637a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_MASTER_RX (2 << 6) 647a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_MASTER_TX (3 << 6) 657a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_SLAVE_RX (0 << 6) 667a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_SLAVE_TX (1 << 6) 677a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_MODEMASK (3 << 6) 68e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 697a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_START (1 << 5) 707a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_BUSBUSY (1 << 5) 717a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_TXRXEN (1 << 4) 727a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_ARBITR (1 << 3) 737a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_ASSLAVE (1 << 2) 747a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_ADDR0 (1 << 1) 757a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICSTAT_LASTBIT (1 << 0) 76e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 77e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICLC_SDA_DELAY0 (0 << 0) 78e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICLC_SDA_DELAY5 (1 << 0) 79e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICLC_SDA_DELAY10 (2 << 0) 80e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICLC_SDA_DELAY15 (3 << 0) 81e636602ac2613da8c1777cb42443223994be4107Heiko Stübner#define S3C2410_IICLC_SDA_DELAY_MASK (3 << 0) 82e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 837a6674dabfe240cc7015fc201f9662d0640e8081Heiko Stübner#define S3C2410_IICLC_FILTER_ON (1 << 2) 84e636602ac2613da8c1777cb42443223994be4107Heiko Stübner 8527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */ 8627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#define QUIRK_S3C2440 (1 << 0) 87ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_HDMIPHY (1 << 1) 88ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_NO_GPIO (1 << 2) 89117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan#define QUIRK_POLL (1 << 3) 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 91fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz/* Max time to wait for bus to become idle after a xfer (in us) */ 92fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz#define S3C2410_IDLE_TIMEOUT 5000 93fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 9427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* i2c controller state */ 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsenum s3c24xx_i2c_state { 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_IDLE, 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_START, 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_READ, 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_WRITE, 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_STOP 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct s3c24xx_i2c { 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wait_queue_head_t wait; 1055f1b11555ef21fb3a8a9d21a2e5914e2bc1b9d9bPankaj Dubey kernel_ulong_t quirks; 106be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks unsigned int suspended:1; 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msg; 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_num; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_idx; 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_ptr; 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 113e00a8cdf325346c531c841ee85c803792db60157Ben Dooks unsigned int tx_setup; 114e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks unsigned int irq; 115e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds enum s3c24xx_i2c_state state; 11761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long clkrate; 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void __iomem *regs; 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct clk *clk; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct device *dev; 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_adapter adap; 12361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 1244fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata; 1255a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int gpios[2]; 1262693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa struct pinctrl *pctrl; 12761f4d6b42158a836a008711a71b68cc78b0624aaNaveen Krishna Ch#if defined(CONFIG_ARM_S3C24XX_CPUFREQ) 12861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks struct notifier_block freq_transition; 12961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#endif 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowskistatic struct platform_device_id s3c24xx_driver_ids[] = { 13327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { 13427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .name = "s3c2410-i2c", 13527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .driver_data = 0, 13627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski }, { 13727452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .name = "s3c2440-i2c", 13827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .driver_data = QUIRK_S3C2440, 139ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski }, { 140ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .name = "s3c2440-hdmiphy-i2c", 141ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .driver_data = QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO, 14227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski }, { }, 14327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski}; 14427452498a6ed507154616d59e6bd41a96ec291c8Karol LewandowskiMODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids); 14527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski 146117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthanstatic int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat); 147117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 14827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#ifdef CONFIG_OF 14927452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowskistatic const struct of_device_id s3c24xx_i2c_match[] = { 15027452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { .compatible = "samsung,s3c2410-i2c", .data = (void *)0 }, 15127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { .compatible = "samsung,s3c2440-i2c", .data = (void *)QUIRK_S3C2440 }, 152ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski { .compatible = "samsung,s3c2440-hdmiphy-i2c", 153ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .data = (void *)(QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO) }, 154faf93ff6ed5f6406ca51ec6d60f85fa166fe545cGiridhar Maruthy { .compatible = "samsung,exynos5440-i2c", 155faf93ff6ed5f6406ca51ec6d60f85fa166fe545cGiridhar Maruthy .data = (void *)(QUIRK_S3C2440 | QUIRK_NO_GPIO) }, 156117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan { .compatible = "samsung,exynos5-sata-phy-i2c", 157117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan .data = (void *)(QUIRK_S3C2440 | QUIRK_POLL | QUIRK_NO_GPIO) }, 15827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski {}, 15927452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski}; 16027452498a6ed507154616d59e6bd41a96ec291c8Karol LewandowskiMODULE_DEVICE_TABLE(of, s3c24xx_i2c_match); 16127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#endif 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 16327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* s3c24xx_get_device_quirks 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 16527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski * Get controller type either from device tree or platform device variant. 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1685f1b11555ef21fb3a8a9d21a2e5914e2bc1b9d9bPankaj Dubeystatic inline kernel_ulong_t s3c24xx_get_device_quirks(struct platform_device *pdev) 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 17027452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski if (pdev->dev.of_node) { 17127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski const struct of_device_id *match; 172b900ba4c1513a8c9a2fab8dca4cc6f50b17d6861Karol Lewandowski match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node); 1735f1b11555ef21fb3a8a9d21a2e5914e2bc1b9d9bPankaj Dubey return (kernel_ulong_t)match->data; 17427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski } 1755a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 17627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski return platform_get_device_id(pdev)->driver_data; 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_master_complete 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * complete the message and wake up the caller, using the given return code, 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * or zero to mean ok. 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret) 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "master_complete %d\n", ret); 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg = NULL; 1913d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->msg_idx++; 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_num = 0; 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret) 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx = ret; 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 196117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (!(i2c->quirks & QUIRK_POLL)) 197117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan wake_up(&i2c->wait); 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c) 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2033d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON); 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c) 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2113d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON); 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* irq enable/disable functions */ 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c) 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2213d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON); 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c) 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2293d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON); 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 234117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthanstatic bool is_ack(struct s3c24xx_i2c *i2c) 235117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan{ 236117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan int tries; 237117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 238117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan for (tries = 50; tries; --tries) { 239117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (readl(i2c->regs + S3C2410_IICCON) 240117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan & S3C2410_IICCON_IRQPEND) { 241117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (!(readl(i2c->regs + S3C2410_IICSTAT) 242117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan & S3C2410_IICSTAT_LASTBIT)) 243117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan return true; 244117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 245117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan usleep_range(1000, 2000); 246117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 247117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_err(i2c->dev, "ack was not recieved\n"); 248117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan return false; 249117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan} 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_message_start 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2533d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * put the start of a message onto the bus 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2563d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooksstatic void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msg) 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int addr = (msg->addr & 0x7f) << 1; 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long stat; 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iiccon; 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat = 0; 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_TXRXEN; 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (msg->flags & I2C_M_RD) { 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_MASTER_RX; 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr |= 1; 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_MASTER_TX; 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (msg->flags & I2C_M_REV_DIR_ADDR) 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr ^= 1; 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 27548fc7f7e787dd65ffe88521bce31f4062ba273ebAdam Buchbinder /* todo - check for whether ack wanted or not */ 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_enable_ack(i2c); 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iiccon = readl(i2c->regs + S3C2410_IICCON); 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(stat, i2c->regs + S3C2410_IICSTAT); 2803d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr); 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(addr, i2c->regs + S3C2410_IICDS); 2833d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 284e00a8cdf325346c531c841ee85c803792db60157Ben Dooks /* delay here to ensure the data byte has gotten onto the bus 285e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * before the transaction is started */ 286e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 287e00a8cdf325346c531c841ee85c803792db60157Ben Dooks ndelay(i2c->tx_setup); 288e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon); 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(iiccon, i2c->regs + S3C2410_IICCON); 2913d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2923d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks stat |= S3C2410_IICSTAT_START; 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(stat, i2c->regs + S3C2410_IICSTAT); 294117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 295117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (i2c->quirks & QUIRK_POLL) { 296117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan while ((i2c->msg_num != 0) && is_ack(i2c)) { 297117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan i2c_s3c_irq_nextbyte(i2c, stat); 298117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan stat = readl(i2c->regs + S3C2410_IICSTAT); 299117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 300117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (stat & S3C2410_IICSTAT_ARBITR) 301117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_err(i2c->dev, "deal with arbitration loss\n"); 302117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 303117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicstat = readl(i2c->regs + S3C2410_IICSTAT); 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "STOP\n"); 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3120da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* 3130da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * The datasheet says that the STOP sequence should be: 3140da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 1) I2CSTAT.5 = 0 - Clear BUSY (or 'generate STOP') 3150da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2) I2CCON.4 = 0 - Clear IRQPEND 3160da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3) Wait until the stop condition takes effect. 3170da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 4*) I2CSTAT.4 = 0 - Clear TXRXEN 3180da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3190da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Where, step "4*" is only for buses with the "HDMIPHY" quirk. 3200da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3210da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * However, after much experimentation, it appears that: 3220da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * a) normal buses automatically clear BUSY and transition from 3230da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Master->Slave when they complete generating a STOP condition. 3240da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Therefore, step (3) can be done in doxfer() by polling I2CCON.4 3250da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * after starting the STOP generation here. 3260da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * b) HDMIPHY bus does neither, so there is no way to do step 3. 3270da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * There is no indication when this bus has finished generating 3280da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * STOP. 3290da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3300da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * In fact, we have found that as soon as the IRQPEND bit is cleared in 3310da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * step 2, the HDMIPHY bus generates the STOP condition, and then 3320da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * immediately starts transferring another data byte, even though the 3330da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * bus is supposedly stopped. This is presumably because the bus is 3340da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * still in "Master" mode, and its BUSY bit is still set. 3350da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3360da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * To avoid these extra post-STOP transactions on HDMI phy devices, we 3370da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * just disable Serial Output on the bus (I2CSTAT.4 = 0) directly, 3380da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * instead of first generating a proper STOP condition. This should 3390da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * float SDA & SCK terminating the transfer. Subsequent transfers 3400da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * start with a proper START condition, and proceed normally. 3410da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3420da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * The HDMIPHY bus is an internal bus that always has exactly two 3430da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * devices, the host as Master and the HDMIPHY device as the slave. 3440da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Skipping the STOP condition has been tested on this bus and works. 3450da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz */ 3460da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz if (i2c->quirks & QUIRK_HDMIPHY) { 3470da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* Stop driving the I2C pins */ 3480da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz iicstat &= ~S3C2410_IICSTAT_TXRXEN; 3490da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz } else { 3500da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* stop the transfer */ 3510da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz iicstat &= ~S3C2410_IICSTAT_START; 3520da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz } 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(iicstat, i2c->regs + S3C2410_IICSTAT); 3543d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_STOP; 3563d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_master_complete(i2c, ret); 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_irq(i2c); 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* helper functions to determine the current state in the set of 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * messages we are sending */ 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_lastmsg() 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3663d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * returns TRUE if the current message is the last in the set 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_lastmsg(struct s3c24xx_i2c *i2c) 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_idx >= (i2c->msg_num - 1); 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msglast 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we this is the last byte in the current message 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msglast(struct s3c24xx_i2c *i2c) 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 38185747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo /* msg->len is always 1 for the first byte of smbus block read. 38285747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo * Actual length will be read from slave. More bytes will be 38385747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo * read according to the length then. */ 38485747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1) 38585747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo return 0; 38685747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr == i2c->msg->len-1; 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msgend 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we reached the end of the current message 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msgend(struct s3c24xx_i2c *i2c) 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr >= i2c->msg->len; 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 40019820510c504d5ba572959c67a72d913afc187a6Huisung Kang/* i2c_s3c_irq_nextbyte 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * process an interrupt and work out what to do 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 40519820510c504d5ba572959c67a72d913afc187a6Huisung Kangstatic int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char byte; 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = 0; 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (i2c->state) { 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_IDLE: 41408882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__); 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_STOP: 41808882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__); 4193d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks s3c24xx_i2c_disable_irq(i2c); 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_START: 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last thing we did was send a start condition on the 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bus, or started a new i2c message 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4263d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 42763f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT && 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds !(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ack was not received... */ 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "ack was not received\n"); 43263f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks s3c24xx_i2c_stop(i2c, -ENXIO); 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_READ; 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_WRITE; 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* terminate the transfer if there is nothing to do 44263f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks * as this is used by the i2c probe to find devices. */ 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c) && i2c->msg->len == 0) { 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_READ) 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto prepare_read; 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4523d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* fall through to the write state, as we will need to 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * send a byte as well */ 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_WRITE: 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we are writing data to the device... check for the 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * end of the message, and if so, work out what to do 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4602709781be6141798162f1089df728fb218a590dfBen Dooks if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 4612709781be6141798162f1089df728fb218a590dfBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT) { 4622709781be6141798162f1089df728fb218a590dfBen Dooks dev_dbg(i2c->dev, "WRITE: No Ack\n"); 4632709781be6141798162f1089df728fb218a590dfBen Dooks 4642709781be6141798162f1089df728fb218a590dfBen Dooks s3c24xx_i2c_stop(i2c, -ECONNREFUSED); 4652709781be6141798162f1089df728fb218a590dfBen Dooks goto out_ack; 4662709781be6141798162f1089df728fb218a590dfBen Dooks } 4672709781be6141798162f1089df728fb218a590dfBen Dooks } 4682709781be6141798162f1089df728fb218a590dfBen Dooks 4693d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks retry_write: 4702709781be6141798162f1089df728fb218a590dfBen Dooks 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!is_msgend(i2c)) { 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = i2c->msg->buf[i2c->msg_ptr++]; 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(byte, i2c->regs + S3C2410_IICDS); 474e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 475e00a8cdf325346c531c841ee85c803792db60157Ben Dooks /* delay after writing the byte to allow the 476e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data setup time on the bus, as writing the 477e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data to the register causes the first bit 478e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * to appear on SDA, and SCL will change as 479e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * soon as the interrupt is acknowledged */ 480e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 481e00a8cdf325346c531c841ee85c803792db60157Ben Dooks ndelay(i2c->tx_setup); 482e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (!is_lastmsg(i2c)) { 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to go to the next i2c message */ 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "WRITE: Next Message\n"); 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 4893d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->msg_idx++; 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 4913d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* check to see if we need to do another message */ 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_NOSTART) { 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) { 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* cannot do this, the controller 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * forces us to send a new START 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * when we change direction */ 4991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, -EINVAL); 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto retry_write; 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send the new start */ 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, i2c->msg); 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 5111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send stop */ 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_READ: 5183d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* we have a byte of data in the data register, do 51948fc7f7e787dd65ffe88521bce31f4062ba273ebAdam Buchbinder * something with it, and then work out whether we are 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * going to do any more read/write 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = readb(i2c->regs + S3C2410_IICDS); 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg->buf[i2c->msg_ptr++] = byte; 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 52685747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo /* Add actual length to read for smbus block read */ 52785747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1) 52885747311ecb6167c989093c64a13807366fdd3a9Jaemin Yoo i2c->msg->len += byte; 5293d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks prepare_read: 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_msglast(i2c)) { 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last byte of buffer */ 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_ack(i2c); 5353d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (is_msgend(i2c)) { 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ok, we've read the entire buffer, see if there 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * is anything else we need to do */ 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) { 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last message, send stop and complete */ 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Send Stop\n"); 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* go to the next transfer */ 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Next Transfer\n"); 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx++; 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* acknowlegde the IRQ and get back on with the work */ 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_ack: 5613d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_irq 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * top level IRQ servicing routine 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5737d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id) 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = dev_id; 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long status; 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = readl(i2c->regs + S3C2410_IICSTAT); 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status & S3C2410_IICSTAT_ARBITR) { 5823d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* deal with arbitration loss */ 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "deal with arbitration loss\n"); 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_IDLE) { 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n"); 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5893d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5943d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* pretty much this leaves us with the fact that we've 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * transmitted or received whatever byte we last sent */ 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 59819820510c504d5ba572959c67a72d913afc187a6Huisung Kang i2c_s3c_irq_nextbyte(i2c, status); 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 604069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass/* 605069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * Disable the bus so that we won't get any interrupts from now on, or try 606069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * to drive any lines. This is the default state when we don't have 607069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * anything to send/receive. 608069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * 609069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * If there is an event on the bus, or we have a pre-existing event at 610069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * kernel boot time, we may not notice the event and the I2C controller 611069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass * will lock the bus with the I2C clock line low indefinitely. 612069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass */ 613069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glassstatic inline void s3c24xx_i2c_disable_bus(struct s3c24xx_i2c *i2c) 614069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass{ 615069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass unsigned long tmp; 616069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass 617069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass /* Stop driving the I2C pins */ 618069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass tmp = readl(i2c->regs + S3C2410_IICSTAT); 619069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass tmp &= ~S3C2410_IICSTAT_TXRXEN; 620069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass writel(tmp, i2c->regs + S3C2410_IICSTAT); 621069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass 622069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass /* We don't expect any interrupts now, and don't want send acks */ 623069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass tmp = readl(i2c->regs + S3C2410_IICCON); 624069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass tmp &= ~(S3C2410_IICCON_IRQEN | S3C2410_IICCON_IRQPEND | 625069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass S3C2410_IICCON_ACKEN); 626069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass writel(tmp, i2c->regs + S3C2410_IICCON); 627069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass} 628069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_set_master 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * get the i2c bus for a master transaction 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c) 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicstat; 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int timeout = 400; 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (timeout-- > 0) { 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iicstat = readl(i2c->regs + S3C2410_IICSTAT); 6423d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(iicstat & S3C2410_IICSTAT_BUSBUSY)) 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds msleep(1); 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ETIMEDOUT; 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 651ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 652fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz/* s3c24xx_i2c_wait_idle 653fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * 654fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * wait for the i2c bus to become idle. 655fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz*/ 656fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 657fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtzstatic void s3c24xx_i2c_wait_idle(struct s3c24xx_i2c *i2c) 658fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz{ 659fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz unsigned long iicstat; 660fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz ktime_t start, now; 661fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz unsigned long delay; 66231f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown int spins; 663fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 664fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz /* ensure the stop has been through the bus */ 665fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 666fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz dev_dbg(i2c->dev, "waiting for bus idle\n"); 667fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 668fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz start = now = ktime_get(); 669fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 670fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz /* 671fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * Most of the time, the bus is already idle within a few usec of the 672fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * end of a transaction. However, really slow i2c devices can stretch 673fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * the clock, delaying STOP generation. 674fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz * 67531f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * On slower SoCs this typically happens within a very small number of 67631f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * instructions so busy wait briefly to avoid scheduling overhead. 677fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz */ 67831f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown spins = 3; 679fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz iicstat = readl(i2c->regs + S3C2410_IICSTAT); 68031f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown while ((iicstat & S3C2410_IICSTAT_START) && --spins) { 68131f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown cpu_relax(); 68231f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown iicstat = readl(i2c->regs + S3C2410_IICSTAT); 683ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski } 684ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 68531f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown /* 68631f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * If we do get an appreciable delay as a compromise between idle 68731f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * detection latency for the normal, fast case, and system load in the 68831f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * slow device case, use an exponential back off in the polling loop, 68931f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * up to 1/10th of the total timeout, then continue to poll at a 69031f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown * constant rate up to the timeout. 69131f313d9bebfc17e48c787c8c36b38662b4134a1Mark Brown */ 692fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz delay = 1; 693fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz while ((iicstat & S3C2410_IICSTAT_START) && 694fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz ktime_us_delta(now, start) < S3C2410_IDLE_TIMEOUT) { 695fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz usleep_range(delay, 2 * delay); 696fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz if (delay < S3C2410_IDLE_TIMEOUT / 10) 697fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz delay <<= 1; 698fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz now = ktime_get(); 699fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz iicstat = readl(i2c->regs + S3C2410_IICSTAT); 700fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz } 701fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz 702fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz if (iicstat & S3C2410_IICSTAT_START) 703fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz dev_warn(i2c->dev, "timeout waiting for bus idle\n"); 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_doxfer 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * this starts an i2c transfer 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7113d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooksstatic int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, 7123d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks struct i2c_msg *msgs, int num) 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 714fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz unsigned long timeout; 7151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 7161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 717be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks if (i2c->suspended) 71861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return -EIO; 71961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 7201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_set_master(i2c); 7211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 7221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot get bus (error %d)\n", ret); 7231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EAGAIN; 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg = msgs; 7281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_num = num; 7291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 7301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx = 0; 7311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_enable_irq(i2c); 7341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, msgs); 7353d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 736117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (i2c->quirks & QUIRK_POLL) { 737117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan ret = i2c->msg_idx; 738117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 739117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (ret != num) 740117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret); 741117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 742117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan goto out; 743117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 744117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 7451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); 7461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = i2c->msg_idx; 7481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7493d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* having these next two as dev_err() makes life very 7501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * noisy when doing an i2cdetect */ 7511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (timeout == 0) 7531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "timeout\n"); 7541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (ret != num) 7551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret); 7561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7570da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* For QUIRK_HDMIPHY, bus is already disabled */ 7580da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz if (i2c->quirks & QUIRK_HDMIPHY) 7590da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz goto out; 7601bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 761fe724bf9f023384eb14431c0e49ec46017ba8e30Daniel Kurtz s3c24xx_i2c_wait_idle(i2c); 7621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 763069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass s3c24xx_i2c_disable_bus(i2c); 764069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass 7651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 766069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass i2c->state = STATE_IDLE; 767069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_xfer 7721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * first port of call from the i2c bus code when an message needs 77444bbe87e9017efa050bb1b506c6822f1f3bb94d7Steven Cole * transferring across the i2c bus. 7751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 7761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_xfer(struct i2c_adapter *adap, 7781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msgs, int num) 7791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = (struct s3c24xx_i2c *)adap->algo_data; 7811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int retry; 7821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 7831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 784c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_get_sync(&adap->dev); 785d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 786d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (retry = 0; retry < adap->retries; retry++) { 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_doxfer(i2c, msgs, num); 7901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard if (ret != -EAGAIN) { 792d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 793a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 7941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 795d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard } 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "Retrying transmission (%d)\n", retry); 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds udelay(100); 8001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 802d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 803a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EREMOTEIO; 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* declare our i2c functionality */ 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic u32 s3c24xx_i2c_func(struct i2c_adapter *adap) 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 81014674e70119ea01549ce593d8901a797f8a90f74Mark Brown return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART | 81114674e70119ea01549ce593d8901a797f8a90f74Mark Brown I2C_FUNC_PROTOCOL_MANGLING; 8121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* i2c bus registration info */ 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8168f9082c5ce0e2c2f7ad0211b0c089f680d2efc11Jean Delvarestatic const struct i2c_algorithm s3c24xx_i2c_algorithm = { 8171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .master_xfer = s3c24xx_i2c_xfer, 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .functionality = s3c24xx_i2c_func, 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 8201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_calcdivisor 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * return the divisor settings for a given frequency 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted, 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int *div1, unsigned int *divs) 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_divs = clkin / wanted; 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_div1; 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > (16*16)) 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 512; 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 16; 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs += calc_div1-1; 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs /= calc_div1; 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs == 0) 8411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 1; 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > 17) 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 17; 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *divs = calc_divs; 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *div1 = calc_div1; 8471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return clkin / (calc_divs * calc_div1); 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 85161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks/* s3c24xx_i2c_clockrate 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * work out a divisor for the user requested frequency setting, 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * either by the requested frequency, or scanning the acceptable 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * range of frequencies until something is found 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 85861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8604fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long clkin = clk_get_rate(i2c->clk); 8621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int divs, div1; 863c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone unsigned long target_frequency; 86461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks u32 iiccon; 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int freq; 8661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 86761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->clkrate = clkin; 8681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds clkin /= 1000; /* clkin now in KHz */ 8693d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 870c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_dbg(i2c->dev, "pdata desired frequency %lu\n", pdata->frequency); 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 872c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency = pdata->frequency ? pdata->frequency : 100000; 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 874c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency /= 1000; /* Target frequency now in KHz */ 8751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 876c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone freq = s3c24xx_i2c_calcdivisor(clkin, target_frequency, &div1, &divs); 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 878c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone if (freq > target_frequency) { 879c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_err(i2c->dev, 880c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone "Unable to achieve desired frequency %luKHz." \ 881c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone " Lowest achievable %dKHz\n", target_frequency, freq); 882c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone return -EINVAL; 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *got = freq; 88661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 88761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon = readl(i2c->regs + S3C2410_IICCON); 88861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon &= ~(S3C2410_IICCON_SCALEMASK | S3C2410_IICCON_TXDIV_512); 88961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= (divs-1); 89061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 89161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (div1 == 512) 89261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= S3C2410_IICCON_TXDIV_512; 89361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 894117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (i2c->quirks & QUIRK_POLL) 895117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan iiccon |= S3C2410_IICCON_SCALE(2); 896117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan 89761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(iiccon, i2c->regs + S3C2410_IICCON); 89861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 89927452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski if (i2c->quirks & QUIRK_S3C2440) { 900a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks unsigned long sda_delay; 901a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 902a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (pdata->sda_delay) { 9037031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = clkin * pdata->sda_delay; 9047031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = DIV_ROUND_UP(sda_delay, 1000000); 905a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = DIV_ROUND_UP(sda_delay, 5); 906a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (sda_delay > 3) 907a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 3; 908a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay |= S3C2410_IICLC_FILTER_ON; 909a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } else 910a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 0; 911a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 912a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay); 913a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks writel(sda_delay, i2c->regs + S3C2440_IICLC); 914a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } 915a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 91661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return 0; 91761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 91861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 91961f4d6b42158a836a008711a71b68cc78b0624aaNaveen Krishna Ch#if defined(CONFIG_ARM_S3C24XX_CPUFREQ) 92061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 92161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition) 92261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 92361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb, 92461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long val, void *data) 92561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 92661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks struct s3c24xx_i2c *i2c = freq_to_i2c(nb); 92761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned int got; 92861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int delta_f; 92961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int ret; 93061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 93161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks delta_f = clk_get_rate(i2c->clk) - i2c->clkrate; 93261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 93361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks /* if we're post-change and the input clock has slowed down 93461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * or at pre-change and the clock is about to speed up, then 93561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * adjust our clock rate. <0 is slow, >0 speedup. 93661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks */ 93761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 93861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if ((val == CPUFREQ_POSTCHANGE && delta_f < 0) || 93961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks (val == CPUFREQ_PRECHANGE && delta_f > 0)) { 9409bcd04bfbbd5599de011176b846ed00ac15a234cDaniel Kurtz i2c_lock_adapter(&i2c->adap); 94161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_clockrate(i2c, &got); 9429bcd04bfbbd5599de011176b846ed00ac15a234cDaniel Kurtz i2c_unlock_adapter(&i2c->adap); 94361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 94461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (ret < 0) 94561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(i2c->dev, "cannot find frequency\n"); 94661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks else 94761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_info(i2c->dev, "setting freq %d\n", got); 94861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks } 94961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 9501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 95361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 95461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 95561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->freq_transition.notifier_call = s3c24xx_i2c_cpufreq_transition; 95661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 95761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return cpufreq_register_notifier(&i2c->freq_transition, 95861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 95961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 96061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 96161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 96261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 96361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks cpufreq_unregister_notifier(&i2c->freq_transition, 96461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 96561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 96661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 96761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#else 96861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 96961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 9701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 97361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 97461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 97561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 97661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#endif 97761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 9785a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 9795a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 9805a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 9815a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int idx, gpio, ret; 9825a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 983ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 984ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return 0; 985ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 9865a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) { 9875a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio = of_get_gpio(i2c->dev->of_node, idx); 9885a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!gpio_is_valid(gpio)) { 9895a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio); 9905a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 9915a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 992963f2076e3b4d62e219b3fa60de7b50e335f5783Abhilash Kesavan i2c->gpios[idx] = gpio; 9935a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9945a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham ret = gpio_request(gpio, "i2c-bus"); 9955a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (ret) { 9965a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "gpio [%d] request failed\n", gpio); 9975a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 9985a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 9995a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 10005a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return 0; 10015a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10025a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamfree_gpio: 10035a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham while (--idx >= 0) 10045a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 10055a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 10065a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10075a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10085a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 10095a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 10105a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham unsigned int idx; 1011ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 1012ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 1013ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return; 1014ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 10155a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) 10165a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 10175a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10185a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 10195a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 10205a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 10218ebe661dd2ab16e2e9c272ed5c86019c7407b9a1Tushar Behera return 0; 10225a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10235a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10245a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 10255a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 10265a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10275a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 10285a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_init 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10313d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * initialise the controller, set the IO lines and frequency 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 10331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c) 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c2410_platform_i2c *pdata; 10371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int freq; 10381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* get the plafrom data */ 10401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10414fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham pdata = i2c->pdata; 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* write slave address */ 10443d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 10451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD); 10461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr); 10481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1049069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass writel(0, i2c->regs + S3C2410_IICCON); 1050069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass writel(0, i2c->regs + S3C2410_IICSTAT); 105161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 10521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to work out the divisors for the clock... */ 10531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 105461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (s3c24xx_i2c_clockrate(i2c, &freq) != 0) { 10551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot meet bus frequency required\n"); 10561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* todo - check that the i2c lines aren't being dragged anywhere */ 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq); 1062069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02x\n", 1063069a9502dd7c51cf2f9031cd86d88774c696101cSimon Glass readl(i2c->regs + S3C2410_IICCON)); 10641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 10661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10685a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 10695a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham/* s3c24xx_i2c_parse_dt 10705a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * 10715a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * Parse the device tree node and retreive the platform data. 10725a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham*/ 10735a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10745a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 10755a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 10765a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 10775a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 10785a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10795a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!np) 10805a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 10815a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10825a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham pdata->bus_num = -1; /* i2c bus number is dynamically assigned */ 10835a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay); 10845a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr); 10855a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-max-bus-freq", 10865a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham (u32 *)&pdata->frequency); 10875a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10885a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 10895a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 10905a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 10915a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 10925a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 10935a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 10945a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 10955a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_probe 10971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called by the bus driver when a suitable device is found 10991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 11001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11013ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_probe(struct platform_device *pdev) 11021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1103692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks struct s3c24xx_i2c *i2c; 11044fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = NULL; 11051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct resource *res; 11061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 11071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11085a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdev->dev.of_node) { 11096d4028c644edc0a2e4a8c948ebf81e8f2f09726eJingoo Han pdata = dev_get_platdata(&pdev->dev); 11105a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdata) { 11115a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(&pdev->dev, "no platform data\n"); 11125a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 11135a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 11146a039cabba3ddd556643156ce0a7cd07da456b20Ben Dooks } 1115399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 11164ea1557ff7862f63511420395d16647b74ba6f5cMark Brown i2c = devm_kzalloc(&pdev->dev, sizeof(struct s3c24xx_i2c), GFP_KERNEL); 1117692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks if (!i2c) { 1118692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks dev_err(&pdev->dev, "no memory for state\n"); 1119692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks return -ENOMEM; 1120692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks } 1121692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 11224fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 11234fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (!i2c->pdata) { 1124669da30d4c972fe62e14a435abf909d19d9b9467Tushar Behera dev_err(&pdev->dev, "no memory for platform data\n"); 1125669da30d4c972fe62e14a435abf909d19d9b9467Tushar Behera return -ENOMEM; 11264fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham } 11274fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 112827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski i2c->quirks = s3c24xx_get_device_quirks(pdev); 11294fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (pdata) 11304fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham memcpy(i2c->pdata, pdata, sizeof(*pdata)); 11315a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham else 11325a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c); 11334fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 1134692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name)); 1135692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.owner = THIS_MODULE; 1136692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.algo = &s3c24xx_i2c_algorithm; 1137692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.retries = 2; 11385304032c9ebe5ed8a6dcac328bb399fb87c5c9afWolfram Sang i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD | I2C_CLASS_DEPRECATED; 1139692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->tx_setup = 50; 1140692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 1141692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks init_waitqueue_head(&i2c->wait); 1142399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 11431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the clock and enable it */ 11441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11453ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->dev = &pdev->dev; 11462b255b947f39d9360662abf6667957add6064646Tushar Behera i2c->clk = devm_clk_get(&pdev->dev, "i2c"); 11471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (IS_ERR(i2c->clk)) { 11483ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot get clock\n"); 1149669da30d4c972fe62e14a435abf909d19d9b9467Tushar Behera return -ENOENT; 11501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11523ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk); 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* map the registers */ 11561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 115884dbf809fbae0591d319a7ea76e6032ff434824cThierry Reding i2c->regs = devm_ioremap_resource(&pdev->dev, res); 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 116052caa59ed335616c5254adff7911465a57ed9f14Linus Torvalds if (IS_ERR(i2c->regs)) 116152caa59ed335616c5254adff7911465a57ed9f14Linus Torvalds return PTR_ERR(i2c->regs); 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1163a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown dev_dbg(&pdev->dev, "registers %p (%p)\n", 1164a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown i2c->regs, res); 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* setup info block for the i2c core */ 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->adap.algo_data = i2c; 11693ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->adap.dev.parent = &pdev->dev; 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11712693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa i2c->pctrl = devm_pinctrl_get_select_default(i2c->dev); 11722693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa 1173658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan /* inititalise the i2c gpio lines */ 1174658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan 1175658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan if (i2c->pdata->cfg_gpio) { 1176658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan i2c->pdata->cfg_gpio(to_platform_device(i2c->dev)); 1177658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan } else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) { 1178d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera return -EINVAL; 1179658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan } 1180658122fe5e3a72940631ceda3efcb841054d91dcAbhilash Kesavan 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* initialise the i2c controller */ 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1183d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera clk_prepare_enable(i2c->clk); 11841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_init(i2c); 1185d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera clk_disable_unprepare(i2c->clk); 1186d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera if (ret != 0) { 1187d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera dev_err(&pdev->dev, "I2C controller init failed\n"); 1188d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera return ret; 1189d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera } 11901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the IRQ for this unit (note, this relies on the init call to 11913d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * ensure no current IRQs pending 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1194117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (!(i2c->quirks & QUIRK_POLL)) { 1195117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan i2c->irq = ret = platform_get_irq(pdev, 0); 1196117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (ret <= 0) { 1197117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_err(&pdev->dev, "cannot find IRQ\n"); 1198117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan return ret; 1199117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12012b255b947f39d9360662abf6667957add6064646Tushar Behera ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0, 1202117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_name(&pdev->dev), i2c); 12031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1204117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan if (ret != 0) { 1205117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq); 1206117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan return ret; 1207117053f77a5a4d055ec4fc7b4f6639045a24fefdVasanth Ananthan } 12081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 121061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_register_cpufreq(i2c); 12111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 121261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(&pdev->dev, "failed to register cpufreq notifier\n"); 1213d16933b33914a6dff38a4ecbe8edce44a17898e8Tushar Behera return ret; 12141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1216399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks /* Note, previous versions of the driver used i2c_add_adapter() 1217399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * to add the bus at any number. We now pass the bus number via 1218399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * the platform data, so if unset it will now default to always 1219399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * being bus 0. 1220399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks */ 1221399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 12224fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->adap.nr = i2c->pdata->bus_num; 12235a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham i2c->adap.dev.of_node = pdev->dev.of_node; 1224399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 1225399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks ret = i2c_add_numbered_adapter(&i2c->adap); 12261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 12273ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "failed to add bus to i2c core\n"); 1228dc6fea4456aeadd3452638668101f269fbb9fd0dTushar Behera s3c24xx_i2c_deregister_cpufreq(i2c); 1229dc6fea4456aeadd3452638668101f269fbb9fd0dTushar Behera return ret; 12301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12323ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King platform_set_drvdata(pdev, i2c); 12331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1234c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&pdev->dev); 1235c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&i2c->adap.dev); 1236c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 123722e965c2aeb3e636831c8b28f9d7d8e25199891eJean Delvare dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev)); 12385b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks return 0; 12391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_remove 12421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 12431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called when device is removed from the bus 12441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 12451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12463ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_remove(struct platform_device *pdev) 12471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12483ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 12495b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 1250c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&i2c->adap.dev); 1251c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&pdev->dev); 1252c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 125361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks s3c24xx_i2c_deregister_cpufreq(i2c); 125461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 12555b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks i2c_del_adapter(&i2c->adap); 12565b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 12572693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa if (pdev->dev.of_node && IS_ERR(i2c->pctrl)) 12582693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa s3c24xx_i2c_dt_gpio_free(i2c); 12591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 12611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12632935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM_SLEEP 12646a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_suspend_noirq(struct device *dev) 1265be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks{ 12666a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 12676a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 12686a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1269be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 1; 12706a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1271be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks return 0; 1272be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks} 1273be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks 12746a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_resume(struct device *dev) 12751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12766a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 12776a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 12789480e307cd88ef09ec9294c7d97ebec18e6d2221Russell King 1279be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 0; 1280d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 1281be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks s3c24xx_i2c_init(i2c); 1282d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 12831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 12851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12862935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#endif 12871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12882935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM 1289471452104b8520337ae2fb48c4e61cd4896e025dAlexey Dobriyanstatic const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = { 12902935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM_SLEEP 12916a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .suspend_noirq = s3c24xx_i2c_suspend_noirq, 12926a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .resume = s3c24xx_i2c_resume, 12932935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#endif 12946a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm}; 12956a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 12966a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops) 12971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 12986a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS NULL 12991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 13001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* device driver for platform bus bits */ 13021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13037d85ccd816535f56880f7dfdb4de056794376b2cBen Dooksstatic struct platform_driver s3c24xx_i2c_driver = { 13041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .probe = s3c24xx_i2c_probe, 13051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .remove = s3c24xx_i2c_remove, 13067d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .id_table = s3c24xx_driver_ids, 13073ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .driver = { 13083ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .owner = THIS_MODULE, 13097d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .name = "s3c-i2c", 13106a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .pm = S3C24XX_DEV_PM_OPS, 13119df7eadf80caea58b9854a8433cba543dbe3b161Karol Lewandowski .of_match_table = of_match_ptr(s3c24xx_i2c_match), 13123ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King }, 13131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 13141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init i2c_adap_s3c_init(void) 13161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13177d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks return platform_driver_register(&s3c24xx_i2c_driver); 13181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 131918dc83a6ea483941fb34293c6805a85bbcf0f718Mark Brownsubsys_initcall(i2c_adap_s3c_init); 13201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit i2c_adap_s3c_exit(void) 13221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13237d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks platform_driver_unregister(&s3c24xx_i2c_driver); 13241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(i2c_adap_s3c_exit); 13261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("S3C24XX I2C Bus driver"); 13281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); 13291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1330