i2c-s3c2410.c revision 0da2e7768b4c2b4dbbb148ebe1606b6b4698fca2
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> 395a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#include <linux/of_i2c.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 459498cb79463c9b2abb243a4b0c2ce3ac1853d5b0Ben Dooks#include <plat/regs-iic.h> 46436d42c61c3eef1d02256174c8615046c61a28adArnd Bergmann#include <linux/platform_data/i2c-s3c2410.h> 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */ 4927452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#define QUIRK_S3C2440 (1 << 0) 50ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_HDMIPHY (1 << 1) 51ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_NO_GPIO (1 << 2) 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* i2c controller state */ 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsenum s3c24xx_i2c_state { 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_IDLE, 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_START, 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_READ, 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_WRITE, 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_STOP 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct s3c24xx_i2c { 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wait_queue_head_t wait; 6427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski unsigned int quirks; 65be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks unsigned int suspended:1; 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msg; 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_num; 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_idx; 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int msg_ptr; 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 72e00a8cdf325346c531c841ee85c803792db60157Ben Dooks unsigned int tx_setup; 73e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks unsigned int irq; 74e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds enum s3c24xx_i2c_state state; 7661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long clkrate; 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void __iomem *regs; 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct clk *clk; 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct device *dev; 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_adapter adap; 8261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 834fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata; 845a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int gpios[2]; 852693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa struct pinctrl *pctrl; 8661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#ifdef CONFIG_CPU_FREQ 8761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks struct notifier_block freq_transition; 8861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#endif 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowskistatic struct platform_device_id s3c24xx_driver_ids[] = { 9227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { 9327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .name = "s3c2410-i2c", 9427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .driver_data = 0, 9527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski }, { 9627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .name = "s3c2440-i2c", 9727452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski .driver_data = QUIRK_S3C2440, 98ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski }, { 99ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .name = "s3c2440-hdmiphy-i2c", 100ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .driver_data = QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO, 10127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski }, { }, 10227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski}; 10327452498a6ed507154616d59e6bd41a96ec291c8Karol LewandowskiMODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids); 10427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski 10527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#ifdef CONFIG_OF 10627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowskistatic const struct of_device_id s3c24xx_i2c_match[] = { 10727452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { .compatible = "samsung,s3c2410-i2c", .data = (void *)0 }, 10827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski { .compatible = "samsung,s3c2440-i2c", .data = (void *)QUIRK_S3C2440 }, 109ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski { .compatible = "samsung,s3c2440-hdmiphy-i2c", 110ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski .data = (void *)(QUIRK_S3C2440 | QUIRK_HDMIPHY | QUIRK_NO_GPIO) }, 11127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski {}, 11227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski}; 11327452498a6ed507154616d59e6bd41a96ec291c8Karol LewandowskiMODULE_DEVICE_TABLE(of, s3c24xx_i2c_match); 11427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#endif 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* s3c24xx_get_device_quirks 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski * Get controller type either from device tree or platform device variant. 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12127452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowskistatic inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pdev) 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12327452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski if (pdev->dev.of_node) { 12427452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski const struct of_device_id *match; 125b900ba4c1513a8c9a2fab8dca4cc6f50b17d6861Karol Lewandowski match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node); 12627452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski return (unsigned int)match->data; 12727452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski } 1285a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 12927452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski return platform_get_device_id(pdev)->driver_data; 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_master_complete 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * complete the message and wake up the caller, using the given return code, 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * or zero to mean ok. 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret) 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "master_complete %d\n", ret); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg = NULL; 1443d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->msg_idx++; 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_num = 0; 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret) 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx = ret; 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wake_up(&i2c->wait); 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c) 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 1553d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON); 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c) 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 1633d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON); 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* irq enable/disable functions */ 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c) 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 1733d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON); 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c) 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 1813d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp = readl(i2c->regs + S3C2410_IICCON); 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON); 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_message_start 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1893d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * put the start of a message onto the bus 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1923d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooksstatic void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msg) 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int addr = (msg->addr & 0x7f) << 1; 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long stat; 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iiccon; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat = 0; 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_TXRXEN; 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (msg->flags & I2C_M_RD) { 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_MASTER_RX; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr |= 1; 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds stat |= S3C2410_IICSTAT_MASTER_TX; 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (msg->flags & I2C_M_REV_DIR_ADDR) 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr ^= 1; 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2113d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* todo - check for wether ack wanted or not */ 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_enable_ack(i2c); 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iiccon = readl(i2c->regs + S3C2410_IICCON); 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(stat, i2c->regs + S3C2410_IICSTAT); 2163d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr); 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(addr, i2c->regs + S3C2410_IICDS); 2193d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 220e00a8cdf325346c531c841ee85c803792db60157Ben Dooks /* delay here to ensure the data byte has gotten onto the bus 221e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * before the transaction is started */ 222e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 223e00a8cdf325346c531c841ee85c803792db60157Ben Dooks ndelay(i2c->tx_setup); 224e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon); 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(iiccon, i2c->regs + S3C2410_IICCON); 2273d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2283d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks stat |= S3C2410_IICSTAT_START; 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(stat, i2c->regs + S3C2410_IICSTAT); 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicstat = readl(i2c->regs + S3C2410_IICSTAT); 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "STOP\n"); 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2380da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* 2390da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * The datasheet says that the STOP sequence should be: 2400da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 1) I2CSTAT.5 = 0 - Clear BUSY (or 'generate STOP') 2410da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2) I2CCON.4 = 0 - Clear IRQPEND 2420da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 3) Wait until the stop condition takes effect. 2430da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 4*) I2CSTAT.4 = 0 - Clear TXRXEN 2440da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2450da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Where, step "4*" is only for buses with the "HDMIPHY" quirk. 2460da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2470da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * However, after much experimentation, it appears that: 2480da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * a) normal buses automatically clear BUSY and transition from 2490da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Master->Slave when they complete generating a STOP condition. 2500da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Therefore, step (3) can be done in doxfer() by polling I2CCON.4 2510da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * after starting the STOP generation here. 2520da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * b) HDMIPHY bus does neither, so there is no way to do step 3. 2530da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * There is no indication when this bus has finished generating 2540da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * STOP. 2550da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2560da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * In fact, we have found that as soon as the IRQPEND bit is cleared in 2570da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * step 2, the HDMIPHY bus generates the STOP condition, and then 2580da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * immediately starts transferring another data byte, even though the 2590da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * bus is supposedly stopped. This is presumably because the bus is 2600da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * still in "Master" mode, and its BUSY bit is still set. 2610da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2620da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * To avoid these extra post-STOP transactions on HDMI phy devices, we 2630da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * just disable Serial Output on the bus (I2CSTAT.4 = 0) directly, 2640da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * instead of first generating a proper STOP condition. This should 2650da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * float SDA & SCK terminating the transfer. Subsequent transfers 2660da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * start with a proper START condition, and proceed normally. 2670da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * 2680da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * The HDMIPHY bus is an internal bus that always has exactly two 2690da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * devices, the host as Master and the HDMIPHY device as the slave. 2700da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz * Skipping the STOP condition has been tested on this bus and works. 2710da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz */ 2720da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz if (i2c->quirks & QUIRK_HDMIPHY) { 2730da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* Stop driving the I2C pins */ 2740da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz iicstat &= ~S3C2410_IICSTAT_TXRXEN; 2750da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz } else { 2760da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* stop the transfer */ 2770da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz iicstat &= ~S3C2410_IICSTAT_START; 2780da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz } 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(iicstat, i2c->regs + S3C2410_IICSTAT); 2803d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_STOP; 2823d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_master_complete(i2c, ret); 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_irq(i2c); 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* helper functions to determine the current state in the set of 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * messages we are sending */ 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_lastmsg() 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2923d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * returns TRUE if the current message is the last in the set 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_lastmsg(struct s3c24xx_i2c *i2c) 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_idx >= (i2c->msg_num - 1); 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msglast 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we this is the last byte in the current message 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msglast(struct s3c24xx_i2c *i2c) 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr == i2c->msg->len-1; 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msgend 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we reached the end of the current message 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msgend(struct s3c24xx_i2c *i2c) 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr >= i2c->msg->len; 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 32019820510c504d5ba572959c67a72d913afc187a6Huisung Kang/* i2c_s3c_irq_nextbyte 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * process an interrupt and work out what to do 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 32519820510c504d5ba572959c67a72d913afc187a6Huisung Kangstatic int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char byte; 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = 0; 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (i2c->state) { 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_IDLE: 33408882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__); 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_STOP: 33808882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__); 3393d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks s3c24xx_i2c_disable_irq(i2c); 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_START: 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last thing we did was send a start condition on the 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bus, or started a new i2c message 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3463d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 34763f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT && 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds !(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ack was not received... */ 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "ack was not received\n"); 35263f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks s3c24xx_i2c_stop(i2c, -ENXIO); 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_READ; 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_WRITE; 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* terminate the transfer if there is nothing to do 36263f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks * as this is used by the i2c probe to find devices. */ 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c) && i2c->msg->len == 0) { 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_READ) 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto prepare_read; 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3723d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* fall through to the write state, as we will need to 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * send a byte as well */ 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_WRITE: 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we are writing data to the device... check for the 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * end of the message, and if so, work out what to do 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3802709781be6141798162f1089df728fb218a590dfBen Dooks if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 3812709781be6141798162f1089df728fb218a590dfBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT) { 3822709781be6141798162f1089df728fb218a590dfBen Dooks dev_dbg(i2c->dev, "WRITE: No Ack\n"); 3832709781be6141798162f1089df728fb218a590dfBen Dooks 3842709781be6141798162f1089df728fb218a590dfBen Dooks s3c24xx_i2c_stop(i2c, -ECONNREFUSED); 3852709781be6141798162f1089df728fb218a590dfBen Dooks goto out_ack; 3862709781be6141798162f1089df728fb218a590dfBen Dooks } 3872709781be6141798162f1089df728fb218a590dfBen Dooks } 3882709781be6141798162f1089df728fb218a590dfBen Dooks 3893d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks retry_write: 3902709781be6141798162f1089df728fb218a590dfBen Dooks 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!is_msgend(i2c)) { 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = i2c->msg->buf[i2c->msg_ptr++]; 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(byte, i2c->regs + S3C2410_IICDS); 394e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 395e00a8cdf325346c531c841ee85c803792db60157Ben Dooks /* delay after writing the byte to allow the 396e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data setup time on the bus, as writing the 397e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data to the register causes the first bit 398e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * to appear on SDA, and SCL will change as 399e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * soon as the interrupt is acknowledged */ 400e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 401e00a8cdf325346c531c841ee85c803792db60157Ben Dooks ndelay(i2c->tx_setup); 402e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (!is_lastmsg(i2c)) { 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to go to the next i2c message */ 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "WRITE: Next Message\n"); 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 4093d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->msg_idx++; 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 4113d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* check to see if we need to do another message */ 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_NOSTART) { 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) { 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* cannot do this, the controller 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * forces us to send a new START 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * when we change direction */ 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, -EINVAL); 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto retry_write; 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send the new start */ 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, i2c->msg); 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send stop */ 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_READ: 4383d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* we have a byte of data in the data register, do 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * something with it, and then work out wether we are 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * going to do any more read/write 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = readb(i2c->regs + S3C2410_IICDS); 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg->buf[i2c->msg_ptr++] = byte; 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4463d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks prepare_read: 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_msglast(i2c)) { 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last byte of buffer */ 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_ack(i2c); 4523d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (is_msgend(i2c)) { 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ok, we've read the entire buffer, see if there 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * is anything else we need to do */ 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) { 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last message, send stop and complete */ 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Send Stop\n"); 4601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* go to the next transfer */ 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Next Transfer\n"); 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx++; 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* acknowlegde the IRQ and get back on with the work */ 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_ack: 4783d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_irq 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * top level IRQ servicing routine 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4907d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id) 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = dev_id; 4931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long status; 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 4951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = readl(i2c->regs + S3C2410_IICSTAT); 4971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status & S3C2410_IICSTAT_ARBITR) { 4993d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* deal with arbitration loss */ 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "deal with arbitration loss\n"); 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_IDLE) { 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n"); 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5063d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5113d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* pretty much this leaves us with the fact that we've 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * transmitted or received whatever byte we last sent */ 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 51519820510c504d5ba572959c67a72d913afc187a6Huisung Kang i2c_s3c_irq_nextbyte(i2c, status); 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_set_master 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * get the i2c bus for a master transaction 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c) 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicstat; 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int timeout = 400; 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 532ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski /* the timeout for HDMIPHY is reduced to 10 ms because 533ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski * the hangup is expected to happen, so waiting 400 ms 534ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski * causes only unnecessary system hangup 535ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski */ 536ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_HDMIPHY) 537ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski timeout = 10; 538ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (timeout-- > 0) { 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iicstat = readl(i2c->regs + S3C2410_IICSTAT); 5413d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(iicstat & S3C2410_IICSTAT_BUSBUSY)) 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds msleep(1); 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 548ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski /* hang-up of bus dedicated for HDMIPHY occurred, resetting */ 549ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_HDMIPHY) { 550ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICCON); 551ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICSTAT); 552ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICDS); 553ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 554ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return 0; 555ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski } 556ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ETIMEDOUT; 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_doxfer 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * this starts an i2c transfer 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5653d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooksstatic int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, 5663d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks struct i2c_msg *msgs, int num) 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5681bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown unsigned long iicstat, timeout; 5691bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown int spins = 20; 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 572be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks if (i2c->suspended) 57361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return -EIO; 57461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_set_master(i2c); 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot get bus (error %d)\n", ret); 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EAGAIN; 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg = msgs; 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_num = num; 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx = 0; 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_enable_irq(i2c); 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, msgs); 5903d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = i2c->msg_idx; 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5953d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* having these next two as dev_err() makes life very 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * noisy when doing an i2cdetect */ 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (timeout == 0) 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "timeout\n"); 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (ret != num) 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret); 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6030da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz /* For QUIRK_HDMIPHY, bus is already disabled */ 6040da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz if (i2c->quirks & QUIRK_HDMIPHY) 6050da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz goto out; 6060da2e7768b4c2b4dbbb148ebe1606b6b4698fca2Daniel Kurtz 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ensure the stop has been through the bus */ 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6091bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown dev_dbg(i2c->dev, "waiting for bus idle\n"); 6101bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 6111bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown /* first, try busy waiting briefly */ 6121bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown do { 61337de03ea1246c8280f6c8c6f61ea98973e9b9448Mark Brown cpu_relax(); 6141bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown iicstat = readl(i2c->regs + S3C2410_IICSTAT); 6151bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown } while ((iicstat & S3C2410_IICSTAT_START) && --spins); 6161bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 6171bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown /* if that timed out sleep */ 6181bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown if (!spins) { 6191bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown msleep(1); 6201bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown iicstat = readl(i2c->regs + S3C2410_IICSTAT); 6211bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown } 6221bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 6231bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown if (iicstat & S3C2410_IICSTAT_START) 6241bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown dev_warn(i2c->dev, "timeout waiting for bus idle\n"); 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_xfer 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * first port of call from the i2c bus code when an message needs 63344bbe87e9017efa050bb1b506c6822f1f3bb94d7Steven Cole * transferring across the i2c bus. 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_xfer(struct i2c_adapter *adap, 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msgs, int num) 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = (struct s3c24xx_i2c *)adap->algo_data; 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int retry; 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 643c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_get_sync(&adap->dev); 644d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 645d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (retry = 0; retry < adap->retries; retry++) { 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_doxfer(i2c, msgs, num); 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 650d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard if (ret != -EAGAIN) { 651d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 652a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 654d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard } 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "Retrying transmission (%d)\n", retry); 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds udelay(100); 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 661d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 662a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EREMOTEIO; 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* declare our i2c functionality */ 6671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic u32 s3c24xx_i2c_func(struct i2c_adapter *adap) 6681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 66914674e70119ea01549ce593d8901a797f8a90f74Mark Brown return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART | 67014674e70119ea01549ce593d8901a797f8a90f74Mark Brown I2C_FUNC_PROTOCOL_MANGLING; 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* i2c bus registration info */ 6741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6758f9082c5ce0e2c2f7ad0211b0c089f680d2efc11Jean Delvarestatic const struct i2c_algorithm s3c24xx_i2c_algorithm = { 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .master_xfer = s3c24xx_i2c_xfer, 6771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .functionality = s3c24xx_i2c_func, 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_calcdivisor 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * return the divisor settings for a given frequency 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted, 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int *div1, unsigned int *divs) 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_divs = clkin / wanted; 6891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_div1; 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > (16*16)) 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 512; 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 16; 6951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs += calc_div1-1; 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs /= calc_div1; 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs == 0) 7001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 1; 7011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > 17) 7021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 17; 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *divs = calc_divs; 7051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *div1 = calc_div1; 7061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return clkin / (calc_divs * calc_div1); 7081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 71061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks/* s3c24xx_i2c_clockrate 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * work out a divisor for the user requested frequency setting, 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * either by the requested frequency, or scanning the acceptable 7141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * range of frequencies until something is found 7151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 7161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 71761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) 7181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7194fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 7201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long clkin = clk_get_rate(i2c->clk); 7211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int divs, div1; 722c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone unsigned long target_frequency; 72361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks u32 iiccon; 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int freq; 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 72661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->clkrate = clkin; 7271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds clkin /= 1000; /* clkin now in KHz */ 7283d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 729c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_dbg(i2c->dev, "pdata desired frequency %lu\n", pdata->frequency); 7301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 731c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency = pdata->frequency ? pdata->frequency : 100000; 7321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 733c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency /= 1000; /* Target frequency now in KHz */ 7341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 735c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone freq = s3c24xx_i2c_calcdivisor(clkin, target_frequency, &div1, &divs); 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 737c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone if (freq > target_frequency) { 738c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_err(i2c->dev, 739c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone "Unable to achieve desired frequency %luKHz." \ 740c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone " Lowest achievable %dKHz\n", target_frequency, freq); 741c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone return -EINVAL; 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *got = freq; 74561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 74661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon = readl(i2c->regs + S3C2410_IICCON); 74761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon &= ~(S3C2410_IICCON_SCALEMASK | S3C2410_IICCON_TXDIV_512); 74861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= (divs-1); 74961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 75061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (div1 == 512) 75161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= S3C2410_IICCON_TXDIV_512; 75261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 75361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(iiccon, i2c->regs + S3C2410_IICCON); 75461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 75527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski if (i2c->quirks & QUIRK_S3C2440) { 756a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks unsigned long sda_delay; 757a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 758a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (pdata->sda_delay) { 7597031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = clkin * pdata->sda_delay; 7607031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = DIV_ROUND_UP(sda_delay, 1000000); 761a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = DIV_ROUND_UP(sda_delay, 5); 762a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (sda_delay > 3) 763a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 3; 764a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay |= S3C2410_IICLC_FILTER_ON; 765a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } else 766a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 0; 767a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 768a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay); 769a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks writel(sda_delay, i2c->regs + S3C2440_IICLC); 770a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } 771a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 77261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return 0; 77361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 77461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 77561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#ifdef CONFIG_CPU_FREQ 77661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 77761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition) 77861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 77961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb, 78061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long val, void *data) 78161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 78261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks struct s3c24xx_i2c *i2c = freq_to_i2c(nb); 78361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned int got; 78461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int delta_f; 78561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int ret; 78661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 78761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks delta_f = clk_get_rate(i2c->clk) - i2c->clkrate; 78861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 78961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks /* if we're post-change and the input clock has slowed down 79061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * or at pre-change and the clock is about to speed up, then 79161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * adjust our clock rate. <0 is slow, >0 speedup. 79261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks */ 79361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 79461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if ((val == CPUFREQ_POSTCHANGE && delta_f < 0) || 79561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks (val == CPUFREQ_PRECHANGE && delta_f > 0)) { 7969bcd04bfbbd5599de011176b846ed00ac15a234cDaniel Kurtz i2c_lock_adapter(&i2c->adap); 79761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_clockrate(i2c, &got); 7989bcd04bfbbd5599de011176b846ed00ac15a234cDaniel Kurtz i2c_unlock_adapter(&i2c->adap); 79961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 80061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (ret < 0) 80161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(i2c->dev, "cannot find frequency\n"); 80261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks else 80361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_info(i2c->dev, "setting freq %d\n", got); 80461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks } 80561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 80961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 81061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 81161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->freq_transition.notifier_call = s3c24xx_i2c_cpufreq_transition; 81261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 81361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return cpufreq_register_notifier(&i2c->freq_transition, 81461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 81561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 81661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 81761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 81861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 81961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks cpufreq_unregister_notifier(&i2c->freq_transition, 82061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 82161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 82261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 82361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#else 82461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 82561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 82961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 83061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 83161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 83261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#endif 83361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 8345a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 8355a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 8365a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8375a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int idx, gpio, ret; 8385a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 839ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 840ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return 0; 841ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 8425a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) { 8435a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio = of_get_gpio(i2c->dev->of_node, idx); 8445a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!gpio_is_valid(gpio)) { 8455a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio); 8465a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 8475a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8485a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8495a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham ret = gpio_request(gpio, "i2c-bus"); 8505a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (ret) { 8515a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "gpio [%d] request failed\n", gpio); 8525a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 8535a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8545a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8555a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return 0; 8565a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8575a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamfree_gpio: 8585a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham while (--idx >= 0) 8595a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 8605a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 8615a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8625a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8635a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 8645a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8655a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham unsigned int idx; 866ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 867ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 868ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return; 869ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 8705a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) 8715a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 8725a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8735a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 8745a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 8755a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8768ebe661dd2ab16e2e9c272ed5c86019c7407b9a1Tushar Behera return 0; 8775a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8785a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8795a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 8805a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8815a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8825a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 8835a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_init 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8863d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * initialise the controller, set the IO lines and frequency 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c) 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicon = S3C2410_IICCON_IRQEN | S3C2410_IICCON_ACKEN; 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c2410_platform_i2c *pdata; 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int freq; 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* get the plafrom data */ 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8974fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham pdata = i2c->pdata; 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* inititalise the gpio */ 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9018be310a6dea491b28f81672752d9d2c7fc25cdd3Ben Dooks if (pdata->cfg_gpio) 9028be310a6dea491b28f81672752d9d2c7fc25cdd3Ben Dooks pdata->cfg_gpio(to_platform_device(i2c->dev)); 9032693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) 9042693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa return -EINVAL; 9051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* write slave address */ 9073d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD); 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr); 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 91261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(iicon, i2c->regs + S3C2410_IICCON); 91361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to work out the divisors for the clock... */ 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 91661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (s3c24xx_i2c_clockrate(i2c, &freq) != 0) { 91761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(0, i2c->regs + S3C2410_IICCON); 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot meet bus frequency required\n"); 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* todo - check that the i2c lines aren't being dragged anywhere */ 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq); 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02lx\n", iicon); 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9305a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 9315a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham/* s3c24xx_i2c_parse_dt 9325a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * 9335a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * Parse the device tree node and retreive the platform data. 9345a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham*/ 9355a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9365a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 9375a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 9385a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 9395a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 9405a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9415a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!np) 9425a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 9435a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9445a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham pdata->bus_num = -1; /* i2c bus number is dynamically assigned */ 9455a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay); 9465a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr); 9475a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-max-bus-freq", 9485a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham (u32 *)&pdata->frequency); 9495a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 9505a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 9515a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 9525a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 9535a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 9545a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 9555a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 9565a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 9575a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_probe 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called by the bus driver when a suitable device is found 9611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 9621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9633ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_probe(struct platform_device *pdev) 9641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 965692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks struct s3c24xx_i2c *i2c; 9664fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = NULL; 9671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct resource *res; 9681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 9691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9705a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdev->dev.of_node) { 9715a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham pdata = pdev->dev.platform_data; 9725a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdata) { 9735a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(&pdev->dev, "no platform data\n"); 9745a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 9755a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 9766a039cabba3ddd556643156ce0a7cd07da456b20Ben Dooks } 977399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 9784ea1557ff7862f63511420395d16647b74ba6f5cMark Brown i2c = devm_kzalloc(&pdev->dev, sizeof(struct s3c24xx_i2c), GFP_KERNEL); 979692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks if (!i2c) { 980692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks dev_err(&pdev->dev, "no memory for state\n"); 981692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks return -ENOMEM; 982692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks } 983692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 9844fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 9854fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (!i2c->pdata) { 9864fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham ret = -ENOMEM; 9874fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham goto err_noclk; 9884fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham } 9894fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 99027452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski i2c->quirks = s3c24xx_get_device_quirks(pdev); 9914fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (pdata) 9924fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham memcpy(i2c->pdata, pdata, sizeof(*pdata)); 9935a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham else 9945a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c); 9954fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 996692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name)); 997692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.owner = THIS_MODULE; 998692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.algo = &s3c24xx_i2c_algorithm; 999692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.retries = 2; 1000692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; 1001692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->tx_setup = 50; 1002692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 1003692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks init_waitqueue_head(&i2c->wait); 1004399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 10051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the clock and enable it */ 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10073ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->dev = &pdev->dev; 10083ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->clk = clk_get(&pdev->dev, "i2c"); 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (IS_ERR(i2c->clk)) { 10103ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot get clock\n"); 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENOENT; 10125b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_noclk; 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10153ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk); 10161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1017d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* map the registers */ 10201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 10221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res == NULL) { 10233ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot find IO resource\n"); 10241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENOENT; 10255b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_clk; 10261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1028a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown i2c->regs = devm_request_and_ioremap(&pdev->dev, res); 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->regs == NULL) { 10313ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot map IO\n"); 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENXIO; 1033a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown goto err_clk; 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1036a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown dev_dbg(&pdev->dev, "registers %p (%p)\n", 1037a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown i2c->regs, res); 10381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* setup info block for the i2c core */ 10401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->adap.algo_data = i2c; 10423ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->adap.dev.parent = &pdev->dev; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10442693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa i2c->pctrl = devm_pinctrl_get_select_default(i2c->dev); 10452693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa 10461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* initialise the i2c controller */ 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_init(i2c); 10491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) 1050a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown goto err_clk; 10511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the IRQ for this unit (note, this relies on the init call to 10533d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * ensure no current IRQs pending 10541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1056e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks i2c->irq = ret = platform_get_irq(pdev, 0); 1057e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks if (ret <= 0) { 10583ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot find IRQ\n"); 1059a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown goto err_clk; 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10624311051c358ad0e66b68934e7a33cf10ba533466Yong Zhang ret = request_irq(i2c->irq, s3c24xx_i2c_irq, 0, 1063e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks dev_name(&pdev->dev), i2c); 10641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 1066e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq); 1067a72ad456bb93a0114b4d6702421b35a9c548bd46Mark Brown goto err_clk; 10681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 107061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_register_cpufreq(i2c); 10711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 107261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(&pdev->dev, "failed to register cpufreq notifier\n"); 10735b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_irq; 10741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1076399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks /* Note, previous versions of the driver used i2c_add_adapter() 1077399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * to add the bus at any number. We now pass the bus number via 1078399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * the platform data, so if unset it will now default to always 1079399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * being bus 0. 1080399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks */ 1081399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 10824fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->adap.nr = i2c->pdata->bus_num; 10835a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham i2c->adap.dev.of_node = pdev->dev.of_node; 1084399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 1085399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks ret = i2c_add_numbered_adapter(&i2c->adap); 10861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 10873ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "failed to add bus to i2c core\n"); 108861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks goto err_cpufreq; 10891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10915a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_i2c_register_devices(&i2c->adap); 10923ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King platform_set_drvdata(pdev, i2c); 10931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1094c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&pdev->dev); 1095c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&i2c->adap.dev); 1096c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 109722e965c2aeb3e636831c8b28f9d7d8e25199891eJean Delvare dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev)); 1098d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 10995b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks return 0; 11001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 110161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks err_cpufreq: 110261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks s3c24xx_i2c_deregister_cpufreq(i2c); 110361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 11045b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_irq: 1105e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks free_irq(i2c->irq, i2c); 11065b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 11075b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_clk: 1108d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 11095b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks clk_put(i2c->clk); 11101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11115b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_noclk: 11121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_remove 11161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called when device is removed from the bus 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11203ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_remove(struct platform_device *pdev) 11211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11223ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11235b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 1124c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&i2c->adap.dev); 1125c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&pdev->dev); 1126c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 112761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks s3c24xx_i2c_deregister_cpufreq(i2c); 112861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 11295b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks i2c_del_adapter(&i2c->adap); 1130e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks free_irq(i2c->irq, i2c); 11315b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 1132d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 11335b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks clk_put(i2c->clk); 11345b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 11352693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa if (pdev->dev.of_node && IS_ERR(i2c->pctrl)) 11362693ac69880a33d4d9df6f128415b65e745f00baTomasz Figa s3c24xx_i2c_dt_gpio_free(i2c); 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11412935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM_SLEEP 11426a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_suspend_noirq(struct device *dev) 1143be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks{ 11446a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 11456a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11466a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1147be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 1; 11486a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1149be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks return 0; 1150be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks} 1151be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks 11526a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_resume(struct device *dev) 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11546a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 11556a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11569480e307cd88ef09ec9294c7d97ebec18e6d2221Russell King 1157be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 0; 1158d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 1159be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks s3c24xx_i2c_init(i2c); 1160d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11642935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#endif 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11662935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM 1167471452104b8520337ae2fb48c4e61cd4896e025dAlexey Dobriyanstatic const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = { 11682935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#ifdef CONFIG_PM_SLEEP 11696a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .suspend_noirq = s3c24xx_i2c_suspend_noirq, 11706a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .resume = s3c24xx_i2c_resume, 11712935e0e05a3e348f046f1b485e933b85d1479aaaMark Brown#endif 11726a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm}; 11736a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 11746a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops) 11751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11766a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS NULL 11771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* device driver for platform bus bits */ 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11817d85ccd816535f56880f7dfdb4de056794376b2cBen Dooksstatic struct platform_driver s3c24xx_i2c_driver = { 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .probe = s3c24xx_i2c_probe, 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .remove = s3c24xx_i2c_remove, 11847d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .id_table = s3c24xx_driver_ids, 11853ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .driver = { 11863ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .owner = THIS_MODULE, 11877d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .name = "s3c-i2c", 11886a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .pm = S3C24XX_DEV_PM_OPS, 11899df7eadf80caea58b9854a8433cba543dbe3b161Karol Lewandowski .of_match_table = of_match_ptr(s3c24xx_i2c_match), 11903ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King }, 11911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init i2c_adap_s3c_init(void) 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11957d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks return platform_driver_register(&s3c24xx_i2c_driver); 11961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 119718dc83a6ea483941fb34293c6805a85bbcf0f718Mark Brownsubsys_initcall(i2c_adap_s3c_init); 11981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit i2c_adap_s3c_exit(void) 12001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12017d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks platform_driver_unregister(&s3c24xx_i2c_driver); 12021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(i2c_adap_s3c_exit); 12041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("S3C24XX I2C Bus driver"); 12061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); 12071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1208