Index: linux-3.14.30/drivers/i2c/busses/Kconfig =================================================================== --- linux-3.14.30.orig/drivers/i2c/busses/Kconfig 2015-03-11 16:46:46.963996212 +0800 +++ linux-3.14.30/drivers/i2c/busses/Kconfig 2015-03-12 10:40:34.849574512 +0800 @@ -663,6 +663,10 @@ tristate "Ralink I2C Controller" select OF_I2C +config I2C_MT7621 + tristate "Mt7621 I2C Controller" + select OF_I2C + config HAVE_S3C2410_I2C bool help Index: linux-3.14.30/drivers/i2c/busses/Makefile =================================================================== --- linux-3.14.30.orig/drivers/i2c/busses/Makefile 2015-03-11 16:46:46.967996212 +0800 +++ linux-3.14.30/drivers/i2c/busses/Makefile 2015-03-11 17:52:43.008121712 +0800 @@ -64,6 +64,7 @@ obj-$(CONFIG_I2C_PXA) += i2c-pxa.o obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o obj-$(CONFIG_I2C_RALINK) += i2c-ralink.o +obj-$(CONFIG_I2C_MT7621) += i2c-mt7621.o obj-$(CONFIG_I2C_RIIC) += i2c-riic.o obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o obj-$(CONFIG_I2C_S6000) += i2c-s6000.o Index: linux-3.14.30/drivers/i2c/busses/i2c-mt7621.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-3.14.30/drivers/i2c/busses/i2c-mt7621.c 2015-03-12 11:45:00.449759139 +0800 @@ -0,0 +1,358 @@ +/* + * drivers/i2c/busses/i2c-mt7621.c + * + * Copyright (C) 2013 Steven Liu + * + * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus. + * (C) 2014 Sittisak + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define REG_CONFIG_REG 0x00 +#define REG_CLKDIV_REG 0x04 +#define REG_DEVADDR_REG 0x08 +#define REG_ADDR_REG 0x0C +#define REG_DATAOUT_REG 0x10 +#define REG_DATAIN_REG 0x14 +#define REG_STATUS_REG 0x18 +#define REG_STARTXFR_REG 0x1C +#define REG_BYTECNT_REG 0x20 +#define REG_SM0_IS_AUTOMODE 0x28 +#define REG_SM0CTL0 0x40 + + +#define I2C_STARTERR 0x10 +#define I2C_ACKERR 0x08 +#define I2C_DATARDY 0x04 +#define I2C_SDOEMPTY 0x02 +#define I2C_BUSY 0x01 + +/* I2C_CFG register bit field */ +#define I2C_CFG_ADDRLEN_8 (7<<5) /* 8 bits */ +#define I2C_CFG_DEVADLEN_7 (6<<2) +#define I2C_CFG_ADDRDIS (1<<1) +#define I2C_CFG_DEVADDIS (1<<0) + +#define I2C_CFG_DEFAULT (I2C_CFG_ADDRLEN_8 | \ + I2C_CFG_DEVADLEN_7 | \ + I2C_CFG_ADDRDIS) + +#define I2C_RETRY 0x1000 + +#define CLKDIV_VALUE 333 +#define i2c_busy_loop (CLKDIV_VALUE*30) + +#define READ_CMD 0x01 +#define WRITE_CMD 0x00 +#define READ_BLOCK 16 + +#define I2C_OFFSET 0x900 +#define RSTCTRL_OFFSET 0x34 + +#define MT7621_REG(x) (*((volatile u32 *)(x))) + +struct i2c_algo_mt7621_data{ + u32 ioaddr; + wait_queue_head_t waitq; + spinlock_t lock; + int id; +}; +/***********************************************************/ + +static unsigned long clkdiv_value = CLKDIV_VALUE; + +static void __iomem *memsysctlbase; +static void __iomem *membase; +static struct i2c_adapter *adapter; +static int i2c_id; + +static void rt_i2c_w32(u32 val, unsigned reg) +{ + iowrite32(val, membase + reg); +} + +static u32 rt_i2c_r32(unsigned reg) +{ + return ioread32(membase + reg); +} + +static void mt7621_i2c_reset(void) +{ + u32 val; + val = MT7621_REG(RSTCTRL_OFFSET+memsysctlbase); + val = val | (1<<16); + MT7621_REG(RSTCTRL_OFFSET+memsysctlbase) = val; + val = val & ~(1<<16); + MT7621_REG(RSTCTRL_OFFSET+memsysctlbase) = val; + udelay(500); +} +static void mt7621_i2c_enable(struct i2c_msg *msg) +{ + rt_i2c_w32(msg->addr,REG_DEVADDR_REG); + rt_i2c_w32(0,REG_ADDR_REG); +} + +static void i2c_master_init(void) +{ + u32 value; + /*set mt7621 i2c mode*/ + (*((volatile u32*)(memsysctlbase+0x60))) &=~0x4; + + mt7621_i2c_reset(); + rt_i2c_w32(I2C_CFG_DEFAULT,REG_CONFIG_REG); + + value = 1<< 31; + value |= 1<<28; + value |= clkdiv_value <<16; + value |= 1<<6; + value |= 1<<1; + rt_i2c_w32(value,REG_SM0CTL0); + rt_i2c_w32(1,REG_SM0_IS_AUTOMODE);//auto mode +} + + +static inline int rt_i2c_wait_rx_done(void) +{ + int i=0; + while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY)) && (i=i2c_busy_loop){ + pr_err("err,wait for idle timeout"); + return -ETIMEDOUT; + } + return 0; +} + +static inline int rt_i2c_wait_idle(void) +{ + int i=0; + while((rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY) && (i=i2c_busy_loop){ + pr_err("err,wait for idle timeout"); + return -ETIMEDOUT; + } + return 0; +} + +static inline int rt_i2c_wait_tx_done(void) +{ + int i=0; + while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY)) && (i=i2c_busy_loop){ + pr_err("err,wait for idle timeout"); + return -ETIMEDOUT; + } + return 0; +} + +static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg) +{ + int i = 0, j = 0, pos = 0; + int nblock = msg->len / READ_BLOCK; + int rem = msg->len % READ_BLOCK; + + if (msg->flags & I2C_M_TEN) { + printk("10 bits addr not supported\n"); + return -EINVAL; + } + + if (msg->flags & I2C_M_RD) { + for (i = 0; i < nblock; i++) { + if (rt_i2c_wait_idle()) + goto ERR_TIMEOUT; + rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG); + rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); + for (j = 0; j < READ_BLOCK; j++) { + if (rt_i2c_wait_rx_done()) + goto ERR_TIMEOUT; + msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); + } + } + + if (rt_i2c_wait_idle()) { + goto ERR_TIMEOUT; + } + + rt_i2c_w32(rem - 1, REG_BYTECNT_REG); + rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); + + for (i = 0; i < rem; i++) { + if (rt_i2c_wait_rx_done()) + goto ERR_TIMEOUT; + msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); + } + } else { + if (rt_i2c_wait_idle()) { + goto ERR_TIMEOUT; + } + rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG); + for (i = 0; i < msg->len; i++) { + rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG); + if(i == 0) + rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG); + + if (rt_i2c_wait_tx_done()) + goto ERR_TIMEOUT; + } + } + + return 0; +ERR_TIMEOUT: + return -ETIMEDOUT; +} + +static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n) +{ + int i = 0; + int ret = 0; + i2c_master_init(); + mt7621_i2c_enable(m); + + for (i = 0; i != n && ret==0; i++) { + ret = rt_i2c_handle_msg(a, &m[i]); + + if (ret) { + return ret; + } + } + + return i; +} + +static u32 rt_i2c_func(struct i2c_adapter *a) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm rt_i2c_algo = { + .master_xfer = rt_i2c_master_xfer, + .functionality = rt_i2c_func, +}; + +static int rt_i2c_probe(struct platform_device *pdev) +{ + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + int ret; + struct i2c_algo_mt7621_data *adapter_data; + + adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL); + if (!adapter) { + dev_err(&pdev->dev, "failed to allocate i2c_adapter\n"); + ret = -ENOMEM; + goto out; + } + adapter_data = kzalloc(sizeof(struct i2c_algo_mt7621_data), GFP_KERNEL); + if (!adapter_data) { + ret = -ENOMEM; + goto free_adapter; + } + + membase = devm_request_and_ioremap(&pdev->dev, res); + if (IS_ERR(membase)){ + ret = -EBUSY; + goto free_both; + } + memsysctlbase = membase - I2C_OFFSET; + + adapter_data->id = i2c_id++; + strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name)); + + adapter->owner = THIS_MODULE; + adapter->nr = pdev->id; + adapter->timeout = HZ; + adapter->algo = &rt_i2c_algo; + adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; + adapter->dev.parent = &pdev->dev; + adapter->dev.of_node = pdev->dev.of_node; + + init_waitqueue_head(&adapter_data->waitq); + spin_lock_init(&adapter_data->lock); + + platform_set_drvdata(pdev, adapter); + adapter->algo_data = adapter_data; + + ret = i2c_add_numbered_adapter(adapter); + if (ret) + return ret; + + printk("MT7621A i2c add adapter is ok\n"); + + return 0; +free_both: + kfree(adapter_data); + free_adapter: + kfree(adapter); +out: + return ret; +} + +static int rt_i2c_remove(struct platform_device *pdev) +{ + struct i2c_algo_mt7621_data *adapter_data = (struct i2c_algo_mt7621_data *)adapter->algo_data; + release_mem_region((resource_size_t)membase,0x100); + kfree(adapter_data); + kfree(adapter); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static const struct of_device_id i2c_rt_dt_ids[] = { + { .compatible = "ralink,i2c-mt7621", }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids); + +static struct platform_driver rt_i2c_driver = { + .probe = rt_i2c_probe, + .remove = rt_i2c_remove, + .driver = { + .owner = THIS_MODULE, + .name = "i2c-mt7621", + .of_match_table = i2c_rt_dt_ids, + }, +}; + +static int __init i2c_rt_init (void) +{ + return platform_driver_register(&rt_i2c_driver); +} + +static void __exit i2c_rt_exit (void) +{ + platform_driver_unregister(&rt_i2c_driver); +} +module_init (i2c_rt_init); +module_exit (i2c_rt_exit); + +MODULE_AUTHOR("Steven Liu "); +MODULE_DESCRIPTION("MT7621 I2c host driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:MT7621-I2C");