i2c-s3c2410.c revision d3b64c59341ac88b37a4474f8dee86b0d37accca
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> 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/irq.h> 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 449498cb79463c9b2abb243a4b0c2ce3ac1853d5b0Ben Dooks#include <plat/regs-iic.h> 459498cb79463c9b2abb243a4b0c2ce3ac1853d5b0Ben Dooks#include <plat/iic.h> 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4727452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */ 4827452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski#define QUIRK_S3C2440 (1 << 0) 49ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_HDMIPHY (1 << 1) 50ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski#define QUIRK_NO_GPIO (1 << 2) 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski/* i2c controller state */ 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsenum s3c24xx_i2c_state { 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_IDLE, 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_START, 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_READ, 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_WRITE, 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds STATE_STOP 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct s3c24xx_i2c { 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spinlock_t lock; 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 resource *ioarea; 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_adapter adap; 8361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 844fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata; 855a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int gpios[2]; 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 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* stop the transfer */ 2393d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks iicstat &= ~S3C2410_IICSTAT_START; 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(iicstat, i2c->regs + S3C2410_IICSTAT); 2413d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_STOP; 2433d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_master_complete(i2c, ret); 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_irq(i2c); 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* helper functions to determine the current state in the set of 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * messages we are sending */ 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_lastmsg() 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2533d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * returns TRUE if the current message is the last in the set 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_lastmsg(struct s3c24xx_i2c *i2c) 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_idx >= (i2c->msg_num - 1); 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msglast 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we this is the last byte in the current message 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msglast(struct s3c24xx_i2c *i2c) 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr == i2c->msg->len-1; 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* is_msgend 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * returns TRUE if we reached the end of the current message 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int is_msgend(struct s3c24xx_i2c *i2c) 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return i2c->msg_ptr >= i2c->msg->len; 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 28119820510c504d5ba572959c67a72d913afc187a6Huisung Kang/* i2c_s3c_irq_nextbyte 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * process an interrupt and work out what to do 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 28619820510c504d5ba572959c67a72d913afc187a6Huisung Kangstatic int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned char byte; 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret = 0; 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (i2c->state) { 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_IDLE: 29508882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__); 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_STOP: 29908882d20932224d5c4500a855a2f4b1216e5f836Harvey Harrison dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__); 3003d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks s3c24xx_i2c_disable_irq(i2c); 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_START: 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last thing we did was send a start condition on the 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * bus, or started a new i2c message 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3073d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 30863f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT && 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds !(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ack was not received... */ 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "ack was not received\n"); 31363f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks s3c24xx_i2c_stop(i2c, -ENXIO); 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_READ; 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_WRITE; 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* terminate the transfer if there is nothing to do 32363f5c2891eae6b4dd0538ef094e5f256d6150d7bBen Dooks * as this is used by the i2c probe to find devices. */ 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c) && i2c->msg->len == 0) { 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_ack; 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_READ) 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto prepare_read; 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3333d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* fall through to the write state, as we will need to 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * send a byte as well */ 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_WRITE: 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we are writing data to the device... check for the 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * end of the message, and if so, work out what to do 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3412709781be6141798162f1089df728fb218a590dfBen Dooks if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) { 3422709781be6141798162f1089df728fb218a590dfBen Dooks if (iicstat & S3C2410_IICSTAT_LASTBIT) { 3432709781be6141798162f1089df728fb218a590dfBen Dooks dev_dbg(i2c->dev, "WRITE: No Ack\n"); 3442709781be6141798162f1089df728fb218a590dfBen Dooks 3452709781be6141798162f1089df728fb218a590dfBen Dooks s3c24xx_i2c_stop(i2c, -ECONNREFUSED); 3462709781be6141798162f1089df728fb218a590dfBen Dooks goto out_ack; 3472709781be6141798162f1089df728fb218a590dfBen Dooks } 3482709781be6141798162f1089df728fb218a590dfBen Dooks } 3492709781be6141798162f1089df728fb218a590dfBen Dooks 3503d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks retry_write: 3512709781be6141798162f1089df728fb218a590dfBen Dooks 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!is_msgend(i2c)) { 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = i2c->msg->buf[i2c->msg_ptr++]; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(byte, i2c->regs + S3C2410_IICDS); 355e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 356e00a8cdf325346c531c841ee85c803792db60157Ben Dooks /* delay after writing the byte to allow the 357e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data setup time on the bus, as writing the 358e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * data to the register causes the first bit 359e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * to appear on SDA, and SCL will change as 360e00a8cdf325346c531c841ee85c803792db60157Ben Dooks * soon as the interrupt is acknowledged */ 361e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 362e00a8cdf325346c531c841ee85c803792db60157Ben Dooks ndelay(i2c->tx_setup); 363e00a8cdf325346c531c841ee85c803792db60157Ben Dooks 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (!is_lastmsg(i2c)) { 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to go to the next i2c message */ 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "WRITE: Next Message\n"); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 3703d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->msg_idx++; 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 3723d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* check to see if we need to do another message */ 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_NOSTART) { 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->msg->flags & I2C_M_RD) { 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* cannot do this, the controller 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * forces us to send a new START 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * when we change direction */ 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, -EINVAL); 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto retry_write; 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send the new start */ 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, i2c->msg); 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* send stop */ 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATE_READ: 3993d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* we have a byte of data in the data register, do 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * something with it, and then work out wether we are 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * going to do any more read/write 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds byte = readb(i2c->regs + S3C2410_IICDS); 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg->buf[i2c->msg_ptr++] = byte; 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4073d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks prepare_read: 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_msglast(i2c)) { 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last byte of buffer */ 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_disable_ack(i2c); 4133d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (is_msgend(i2c)) { 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ok, we've read the entire buffer, see if there 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * is anything else we need to do */ 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (is_lastmsg(i2c)) { 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* last message, send stop and complete */ 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Send Stop\n"); 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_stop(i2c, 0); 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* go to the next transfer */ 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "READ: Next Transfer\n"); 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx++; 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg++; 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* acknowlegde the IRQ and get back on with the work */ 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_ack: 4393d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_irq 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * top level IRQ servicing routine 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4517d12e780e003f93433d49ce78cfedf4b4c52adc5David Howellsstatic irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id) 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = dev_id; 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long status; 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds status = readl(i2c->regs + S3C2410_IICSTAT); 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (status & S3C2410_IICSTAT_ARBITR) { 4603d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* deal with arbitration loss */ 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "deal with arbitration loss\n"); 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->state == STATE_IDLE) { 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n"); 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4673d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks tmp = readl(i2c->regs + S3C2410_IICCON); 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tmp &= ~S3C2410_IICCON_IRQPEND; 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writel(tmp, i2c->regs + S3C2410_IICCON); 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4723d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* pretty much this leaves us with the fact that we've 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * transmitted or received whatever byte we last sent */ 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 47619820510c504d5ba572959c67a72d913afc187a6Huisung Kang i2c_s3c_irq_nextbyte(i2c, status); 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return IRQ_HANDLED; 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_set_master 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * get the i2c bus for a master transaction 4861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 4871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c) 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicstat; 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int timeout = 400; 4921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 493ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski /* the timeout for HDMIPHY is reduced to 10 ms because 494ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski * the hangup is expected to happen, so waiting 400 ms 495ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski * causes only unnecessary system hangup 496ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski */ 497ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_HDMIPHY) 498ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski timeout = 10; 499ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 5001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (timeout-- > 0) { 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds iicstat = readl(i2c->regs + S3C2410_IICSTAT); 5023d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(iicstat & S3C2410_IICSTAT_BUSBUSY)) 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds msleep(1); 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 509ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski /* hang-up of bus dedicated for HDMIPHY occurred, resetting */ 510ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_HDMIPHY) { 511ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICCON); 512ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICSTAT); 513ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski writel(0, i2c->regs + S3C2410_IICDS); 514ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 515ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return 0; 516ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski } 517ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ETIMEDOUT; 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_doxfer 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * this starts an i2c transfer 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5263d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooksstatic int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, 5273d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks struct i2c_msg *msgs, int num) 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5291bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown unsigned long iicstat, timeout; 5301bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown int spins = 20; 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 533be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks if (i2c->suspended) 53461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return -EIO; 53561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_set_master(i2c); 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot get bus (error %d)\n", ret); 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EAGAIN; 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&i2c->lock); 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg = msgs; 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_num = num; 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_ptr = 0; 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->msg_idx = 0; 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->state = STATE_START; 5501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_enable_irq(i2c); 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s3c24xx_i2c_message_start(i2c, msgs); 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&i2c->lock); 5543d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = i2c->msg_idx; 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5593d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks /* having these next two as dev_err() makes life very 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * noisy when doing an i2cdetect */ 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (timeout == 0) 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "timeout\n"); 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (ret != num) 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret); 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* ensure the stop has been through the bus */ 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5691bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown dev_dbg(i2c->dev, "waiting for bus idle\n"); 5701bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 5711bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown /* first, try busy waiting briefly */ 5721bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown do { 57337de03ea1246c8280f6c8c6f61ea98973e9b9448Mark Brown cpu_relax(); 5741bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown iicstat = readl(i2c->regs + S3C2410_IICSTAT); 5751bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown } while ((iicstat & S3C2410_IICSTAT_START) && --spins); 5761bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 5771bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown /* if that timed out sleep */ 5781bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown if (!spins) { 5791bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown msleep(1); 5801bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown iicstat = readl(i2c->regs + S3C2410_IICSTAT); 5811bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown } 5821bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown 5831bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown if (iicstat & S3C2410_IICSTAT_START) 5841bc2962e530527de829bf4b1eb99f24dc25d1828Mark Brown dev_warn(i2c->dev, "timeout waiting for bus idle\n"); 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 5871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_xfer 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * first port of call from the i2c bus code when an message needs 59344bbe87e9017efa050bb1b506c6822f1f3bb94d7Steven Cole * transferring across the i2c bus. 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_xfer(struct i2c_adapter *adap, 5971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct i2c_msg *msgs, int num) 5981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c24xx_i2c *i2c = (struct s3c24xx_i2c *)adap->algo_data; 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int retry; 6011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 6021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 603c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_get_sync(&adap->dev); 604d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 605d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard 6061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (retry = 0; retry < adap->retries; retry++) { 6071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_doxfer(i2c, msgs, num); 6091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 610d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard if (ret != -EAGAIN) { 611d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 612a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 614d2360b8e845ce0e142e72697a504ee9372421dc3Arnaud Patard } 6151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "Retrying transmission (%d)\n", retry); 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds udelay(100); 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 621d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 622a86ae9ff2905ebff4689bcd4946d7a95d9f5f237Mark Brown pm_runtime_put(&adap->dev); 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EREMOTEIO; 6241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* declare our i2c functionality */ 6271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic u32 s3c24xx_i2c_func(struct i2c_adapter *adap) 6281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 62914674e70119ea01549ce593d8901a797f8a90f74Mark Brown return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART | 63014674e70119ea01549ce593d8901a797f8a90f74Mark Brown I2C_FUNC_PROTOCOL_MANGLING; 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* i2c bus registration info */ 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6358f9082c5ce0e2c2f7ad0211b0c089f680d2efc11Jean Delvarestatic const struct i2c_algorithm s3c24xx_i2c_algorithm = { 6361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .master_xfer = s3c24xx_i2c_xfer, 6371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .functionality = s3c24xx_i2c_func, 6381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 6391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_calcdivisor 6411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * return the divisor settings for a given frequency 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted, 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int *div1, unsigned int *divs) 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_divs = clkin / wanted; 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int calc_div1; 6501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > (16*16)) 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 512; 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_div1 = 16; 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs += calc_div1-1; 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs /= calc_div1; 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs == 0) 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 1; 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (calc_divs > 17) 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds calc_divs = 17; 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *divs = calc_divs; 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *div1 = calc_div1; 6661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return clkin / (calc_divs * calc_div1); 6681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 67061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks/* s3c24xx_i2c_clockrate 6711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 6721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * work out a divisor for the user requested frequency setting, 6731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * either by the requested frequency, or scanning the acceptable 6741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * range of frequencies until something is found 6751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 6761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 67761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got) 6781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6794fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long clkin = clk_get_rate(i2c->clk); 6811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int divs, div1; 682c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone unsigned long target_frequency; 68361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks u32 iiccon; 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int freq; 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 68661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->clkrate = clkin; 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds clkin /= 1000; /* clkin now in KHz */ 6883d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 689c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_dbg(i2c->dev, "pdata desired frequency %lu\n", pdata->frequency); 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 691c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency = pdata->frequency ? pdata->frequency : 100000; 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 693c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone target_frequency /= 1000; /* Target frequency now in KHz */ 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 695c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone freq = s3c24xx_i2c_calcdivisor(clkin, target_frequency, &div1, &divs); 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 697c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone if (freq > target_frequency) { 698c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone dev_err(i2c->dev, 699c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone "Unable to achieve desired frequency %luKHz." \ 700c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone " Lowest achievable %dKHz\n", target_frequency, freq); 701c564e6ae6c5aa6e3995ff87ed4a32b4788ad5109Daniel Silverstone return -EINVAL; 7021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *got = freq; 70561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 70661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon = readl(i2c->regs + S3C2410_IICCON); 70761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon &= ~(S3C2410_IICCON_SCALEMASK | S3C2410_IICCON_TXDIV_512); 70861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= (divs-1); 70961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 71061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (div1 == 512) 71161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks iiccon |= S3C2410_IICCON_TXDIV_512; 71261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 71361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(iiccon, i2c->regs + S3C2410_IICCON); 71461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 71527452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski if (i2c->quirks & QUIRK_S3C2440) { 716a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks unsigned long sda_delay; 717a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 718a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (pdata->sda_delay) { 7197031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = clkin * pdata->sda_delay; 7207031307aefb6048377385dbb0af2dd43bb0190bbMyungJoo Ham sda_delay = DIV_ROUND_UP(sda_delay, 1000000); 721a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = DIV_ROUND_UP(sda_delay, 5); 722a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks if (sda_delay > 3) 723a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 3; 724a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay |= S3C2410_IICLC_FILTER_ON; 725a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } else 726a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks sda_delay = 0; 727a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 728a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay); 729a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks writel(sda_delay, i2c->regs + S3C2440_IICLC); 730a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks } 731a192f7153bb33151f83440cd9c0442233a064bf1Ben Dooks 73261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return 0; 73361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 73461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 73561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#ifdef CONFIG_CPU_FREQ 73661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 73761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition) 73861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 73961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb, 74061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long val, void *data) 74161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 74261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks struct s3c24xx_i2c *i2c = freq_to_i2c(nb); 74361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned long flags; 74461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks unsigned int got; 74561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int delta_f; 74661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks int ret; 74761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 74861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks delta_f = clk_get_rate(i2c->clk) - i2c->clkrate; 74961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 75061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks /* if we're post-change and the input clock has slowed down 75161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * or at pre-change and the clock is about to speed up, then 75261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks * adjust our clock rate. <0 is slow, >0 speedup. 75361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks */ 75461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 75561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if ((val == CPUFREQ_POSTCHANGE && delta_f < 0) || 75661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks (val == CPUFREQ_PRECHANGE && delta_f > 0)) { 75761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks spin_lock_irqsave(&i2c->lock, flags); 75861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_clockrate(i2c, &got); 75961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks spin_unlock_irqrestore(&i2c->lock, flags); 76061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 76161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (ret < 0) 76261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(i2c->dev, "cannot find frequency\n"); 76361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks else 76461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_info(i2c->dev, "setting freq %d\n", got); 76561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks } 76661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 7671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 77061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 77161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 77261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks i2c->freq_transition.notifier_call = s3c24xx_i2c_cpufreq_transition; 77361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 77461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks return cpufreq_register_notifier(&i2c->freq_transition, 77561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 77661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 77761c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 77861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 77961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 78061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks cpufreq_unregister_notifier(&i2c->freq_transition, 78161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks CPUFREQ_TRANSITION_NOTIFIER); 78261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 78361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 78461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#else 78561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c) 78661c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 79061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooksstatic inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c) 79161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks{ 79261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks} 79361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks#endif 79461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 7955a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 7965a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 7975a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 7985a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham int idx, gpio, ret; 7995a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 800ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 801ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return 0; 802ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 8035a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) { 8045a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio = of_get_gpio(i2c->dev->of_node, idx); 8055a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!gpio_is_valid(gpio)) { 8065a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "invalid gpio[%d]: %d\n", idx, gpio); 8075a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 8085a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8095a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8105a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham ret = gpio_request(gpio, "i2c-bus"); 8115a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (ret) { 8125a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(i2c->dev, "gpio [%d] request failed\n", gpio); 8135a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham goto free_gpio; 8145a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8155a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 8165a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return 0; 8175a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8185a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamfree_gpio: 8195a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham while (--idx >= 0) 8205a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 8215a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 8225a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8235a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8245a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 8255a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8265a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham unsigned int idx; 827ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 828ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski if (i2c->quirks & QUIRK_NO_GPIO) 829ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski return; 830ec39ef83eb9b22cc732329e85fc4ec03e76d9ddaKarol Lewandowski 8315a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham for (idx = 0; idx < 2; idx++) 8325a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham gpio_free(i2c->gpios[idx]); 8335a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8345a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 8355a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic int s3c24xx_i2c_parse_dt_gpio(struct s3c24xx_i2c *i2c) 8365a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8378ebe661dd2ab16e2e9c272ed5c86019c7407b9a1Tushar Behera return 0; 8385a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8395a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8405a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void s3c24xx_i2c_dt_gpio_free(struct s3c24xx_i2c *i2c) 8415a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 8425a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 8435a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 8445a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_init 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 8473d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * initialise the controller, set the IO lines and frequency 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c) 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long iicon = S3C2410_IICCON_IRQEN | S3C2410_IICCON_ACKEN; 8531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct s3c2410_platform_i2c *pdata; 8541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int freq; 8551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* get the plafrom data */ 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8584fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham pdata = i2c->pdata; 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* inititalise the gpio */ 8611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8628be310a6dea491b28f81672752d9d2c7fc25cdd3Ben Dooks if (pdata->cfg_gpio) 8638be310a6dea491b28f81672752d9d2c7fc25cdd3Ben Dooks pdata->cfg_gpio(to_platform_device(i2c->dev)); 8645a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham else 8655a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (s3c24xx_i2c_parse_dt_gpio(i2c)) 8665a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 8671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* write slave address */ 8693d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD); 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr); 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 87461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(iicon, i2c->regs + S3C2410_IICCON); 87561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we need to work out the divisors for the clock... */ 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 87861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks if (s3c24xx_i2c_clockrate(i2c, &freq) != 0) { 87961c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks writel(0, i2c->regs + S3C2410_IICCON); 8801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_err(i2c->dev, "cannot meet bus frequency required\n"); 8811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 8821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* todo - check that the i2c lines aren't being dragged anywhere */ 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq); 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02lx\n", iicon); 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8925a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#ifdef CONFIG_OF 8935a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham/* s3c24xx_i2c_parse_dt 8945a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * 8955a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham * Parse the device tree node and retreive the platform data. 8965a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham*/ 8975a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 8985a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 8995a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 9005a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 9015a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham struct s3c2410_platform_i2c *pdata = i2c->pdata; 9025a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9035a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!np) 9045a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 9055a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9065a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham pdata->bus_num = -1; /* i2c bus number is dynamically assigned */ 9075a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-sda-delay", &pdata->sda_delay); 9085a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-slave-addr", &pdata->slave_addr); 9095a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_property_read_u32(np, "samsung,i2c-max-bus-freq", 9105a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham (u32 *)&pdata->frequency); 9115a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 9125a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#else 9135a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahamstatic void 9145a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abrahams3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c) 9155a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham{ 9165a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return; 9175a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham} 9185a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham#endif 9195a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_probe 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called by the bus driver when a suitable device is found 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9253ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_probe(struct platform_device *pdev) 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 927692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks struct s3c24xx_i2c *i2c; 9284fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham struct s3c2410_platform_i2c *pdata = NULL; 9291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct resource *res; 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int ret; 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9325a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdev->dev.of_node) { 9335a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham pdata = pdev->dev.platform_data; 9345a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham if (!pdata) { 9355a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham dev_err(&pdev->dev, "no platform data\n"); 9365a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham return -EINVAL; 9375a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham } 9386a039cabba3ddd556643156ce0a7cd07da456b20Ben Dooks } 939399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 9404ea1557ff7862f63511420395d16647b74ba6f5cMark Brown i2c = devm_kzalloc(&pdev->dev, sizeof(struct s3c24xx_i2c), GFP_KERNEL); 941692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks if (!i2c) { 942692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks dev_err(&pdev->dev, "no memory for state\n"); 943692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks return -ENOMEM; 944692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks } 945692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 9464fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 9474fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (!i2c->pdata) { 9484fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham ret = -ENOMEM; 9494fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham goto err_noclk; 9504fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham } 9514fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 95227452498a6ed507154616d59e6bd41a96ec291c8Karol Lewandowski i2c->quirks = s3c24xx_get_device_quirks(pdev); 9534fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham if (pdata) 9544fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham memcpy(i2c->pdata, pdata, sizeof(*pdata)); 9555a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham else 9565a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham s3c24xx_i2c_parse_dt(pdev->dev.of_node, i2c); 9574fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham 958692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks strlcpy(i2c->adap.name, "s3c2410-i2c", sizeof(i2c->adap.name)); 959692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.owner = THIS_MODULE; 960692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.algo = &s3c24xx_i2c_algorithm; 961692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.retries = 2; 962692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; 963692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks i2c->tx_setup = 50; 964692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks 965692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks spin_lock_init(&i2c->lock); 966692acbd3a866a9f84e18a5980b3a97ca52e501b2Ben Dooks init_waitqueue_head(&i2c->wait); 967399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 9681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the clock and enable it */ 9691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9703ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->dev = &pdev->dev; 9713ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->clk = clk_get(&pdev->dev, "i2c"); 9721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (IS_ERR(i2c->clk)) { 9733ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot get clock\n"); 9741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENOENT; 9755b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_noclk; 9761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9783ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk); 9791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 980d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 9811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* map the registers */ 9831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 9851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res == NULL) { 9863ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot find IO resource\n"); 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENOENT; 9885b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_clk; 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 991933a2aec8d08cda11c4b427ea7930b0e92eb9bc8Ben Dooks i2c->ioarea = request_mem_region(res->start, resource_size(res), 9921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pdev->name); 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->ioarea == NULL) { 9953ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot request IO\n"); 9961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENXIO; 9975b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_clk; 9981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1000933a2aec8d08cda11c4b427ea7930b0e92eb9bc8Ben Dooks i2c->regs = ioremap(res->start, resource_size(res)); 10011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (i2c->regs == NULL) { 10033ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot map IO\n"); 10041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -ENXIO; 10055b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_ioarea; 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10083d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks dev_dbg(&pdev->dev, "registers %p (%p, %p)\n", 10093d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks i2c->regs, i2c->ioarea, res); 10101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* setup info block for the i2c core */ 10121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds i2c->adap.algo_data = i2c; 10143ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King i2c->adap.dev.parent = &pdev->dev; 10151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* initialise the i2c controller */ 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = s3c24xx_i2c_init(i2c); 10191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) 10205b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_iomap; 10211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* find the IRQ for this unit (note, this relies on the init call to 10233d0911bfe03b5f077cef32ca644b5756d48affc3Ben Dooks * ensure no current IRQs pending 10241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1026e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks i2c->irq = ret = platform_get_irq(pdev, 0); 1027e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks if (ret <= 0) { 10283ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "cannot find IRQ\n"); 10295b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_iomap; 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10324311051c358ad0e66b68934e7a33cf10ba533466Yong Zhang ret = request_irq(i2c->irq, s3c24xx_i2c_irq, 0, 1033e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks dev_name(&pdev->dev), i2c); 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret != 0) { 1036e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq); 10375b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_iomap; 10381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 104061c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks ret = s3c24xx_i2c_register_cpufreq(i2c); 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 104261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks dev_err(&pdev->dev, "failed to register cpufreq notifier\n"); 10435b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks goto err_irq; 10441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1046399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks /* Note, previous versions of the driver used i2c_add_adapter() 1047399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * to add the bus at any number. We now pass the bus number via 1048399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * the platform data, so if unset it will now default to always 1049399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks * being bus 0. 1050399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks */ 1051399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 10524fd81eb2d64295ab038a3ea9d44e0eac85a6648cThomas Abraham i2c->adap.nr = i2c->pdata->bus_num; 10535a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham i2c->adap.dev.of_node = pdev->dev.of_node; 1054399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks 1055399dee2371787825a1845de87c0cbee7b7c30ad6Ben Dooks ret = i2c_add_numbered_adapter(&i2c->adap); 10561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret < 0) { 10573ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King dev_err(&pdev->dev, "failed to add bus to i2c core\n"); 105861c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks goto err_cpufreq; 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10615a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham of_i2c_register_devices(&i2c->adap); 10623ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King platform_set_drvdata(pdev, i2c); 10631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1064c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&pdev->dev); 1065c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_enable(&i2c->adap.dev); 1066c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 106722e965c2aeb3e636831c8b28f9d7d8e25199891eJean Delvare dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev)); 1068d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 10695b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks return 0; 10701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 107161c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks err_cpufreq: 107261c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks s3c24xx_i2c_deregister_cpufreq(i2c); 107361c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 10745b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_irq: 1075e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks free_irq(i2c->irq, i2c); 10765b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 10775b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_iomap: 10785b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks iounmap(i2c->regs); 10795b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 10805b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_ioarea: 10815b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks release_resource(i2c->ioarea); 10825b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks kfree(i2c->ioarea); 10835b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 10845b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_clk: 1085d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 10865b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks clk_put(i2c->clk); 10871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10885b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks err_noclk: 10891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 10901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* s3c24xx_i2c_remove 10931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called when device is removed from the bus 10951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds*/ 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10973ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell Kingstatic int s3c24xx_i2c_remove(struct platform_device *pdev) 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10993ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11005b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 1101c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&i2c->adap.dev); 1102c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown pm_runtime_disable(&pdev->dev); 1103c62c3ca55e0db52b311b1258ed08bc6c7525195eMark Brown 110461c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks s3c24xx_i2c_deregister_cpufreq(i2c); 110561c7cff89224fc5651b5ba5ff2185d19304b2484Ben Dooks 11065b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks i2c_del_adapter(&i2c->adap); 1107e0d1ec97853fa09cf676dc6b51dafd35db12759eBen Dooks free_irq(i2c->irq, i2c); 11085b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 1109d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 11105b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks clk_put(i2c->clk); 11115b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 11125b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks iounmap(i2c->regs); 11135b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks 11145b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks release_resource(i2c->ioarea); 11155a5f50802f5a31b9e15de8df40d5621af970a560Thomas Abraham s3c24xx_i2c_dt_gpio_free(i2c); 11165b68790cd5e2879067bcbc45b01eeb6081e7d731Ben Dooks kfree(i2c->ioarea); 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_PM 11226a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_suspend_noirq(struct device *dev) 1123be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks{ 11246a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 11256a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11266a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1127be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 1; 11286a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 1129be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks return 0; 1130be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks} 1131be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks 11326a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Dammstatic int s3c24xx_i2c_resume(struct device *dev) 11331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11346a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct platform_device *pdev = to_platform_device(dev); 11356a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev); 11369480e307cd88ef09ec9294c7d97ebec18e6d2221Russell King 1137be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks i2c->suspended = 0; 1138d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_prepare_enable(i2c->clk); 1139be44f01e8af3862767f466f89c12640a2f2b0038Ben Dooks s3c24xx_i2c_init(i2c); 1140d3b64c59341ac88b37a4474f8dee86b0d37acccaThomas Abraham clk_disable_unprepare(i2c->clk); 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 11431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1145471452104b8520337ae2fb48c4e61cd4896e025dAlexey Dobriyanstatic const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = { 11466a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .suspend_noirq = s3c24xx_i2c_suspend_noirq, 11476a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .resume = s3c24xx_i2c_resume, 11486a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm}; 11496a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm 11506a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops) 11511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 11526a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm#define S3C24XX_DEV_PM_OPS NULL 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 11541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* device driver for platform bus bits */ 11561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11577d85ccd816535f56880f7dfdb4de056794376b2cBen Dooksstatic struct platform_driver s3c24xx_i2c_driver = { 11581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .probe = s3c24xx_i2c_probe, 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .remove = s3c24xx_i2c_remove, 11607d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .id_table = s3c24xx_driver_ids, 11613ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .driver = { 11623ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King .owner = THIS_MODULE, 11637d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks .name = "s3c-i2c", 11646a6c6189b1fef97de9b8b936131fe2085ac42a5aMagnus Damm .pm = S3C24XX_DEV_PM_OPS, 11659df7eadf80caea58b9854a8433cba543dbe3b161Karol Lewandowski .of_match_table = of_match_ptr(s3c24xx_i2c_match), 11663ae5eaec1d2d9c0cf53745352e7d4b152810ba24Russell King }, 11671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 11681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init i2c_adap_s3c_init(void) 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11717d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks return platform_driver_register(&s3c24xx_i2c_driver); 11721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 117318dc83a6ea483941fb34293c6805a85bbcf0f718Mark Brownsubsys_initcall(i2c_adap_s3c_init); 11741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit i2c_adap_s3c_exit(void) 11761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11777d85ccd816535f56880f7dfdb4de056794376b2cBen Dooks platform_driver_unregister(&s3c24xx_i2c_driver); 11781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(i2c_adap_s3c_exit); 11801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION("S3C24XX I2C Bus driver"); 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1184