diff options
Diffstat (limited to 'target/linux/ramips/patches-3.18/0074-i2c-MIPS-add-mt7621-I2C-driver.patch')
| -rw-r--r-- | target/linux/ramips/patches-3.18/0074-i2c-MIPS-add-mt7621-I2C-driver.patch | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.18/0074-i2c-MIPS-add-mt7621-I2C-driver.patch b/target/linux/ramips/patches-3.18/0074-i2c-MIPS-add-mt7621-I2C-driver.patch new file mode 100644 index 0000000..9b9a72b --- /dev/null +++ b/target/linux/ramips/patches-3.18/0074-i2c-MIPS-add-mt7621-I2C-driver.patch @@ -0,0 +1,329 @@ +--- a/drivers/i2c/busses/Kconfig ++++ b/drivers/i2c/busses/Kconfig +@@ -715,6 +715,10 @@ config I2C_RALINK + tristate "Ralink I2C Controller" + select OF_I2C + ++config I2C_MT7621 ++ tristate "MT7621 I2C Controller" ++ select OF_I2C ++ + config HAVE_S3C2410_I2C + bool + help +--- a/drivers/i2c/busses/Makefile ++++ b/drivers/i2c/busses/Makefile +@@ -67,6 +67,7 @@ obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o + obj-$(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_QUP) += i2c-qup.o + obj-$(CONFIG_I2C_RIIC) += i2c-riic.o + obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o +--- /dev/null ++++ b/drivers/i2c/busses/i2c-mt7621.c +@@ -0,0 +1,303 @@ ++/* ++ * drivers/i2c/busses/i2c-mt7621.c ++ * ++ * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.com> ++ * ++ * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus. ++ * (C) 2014 Sittisak <sittisaks@hotmail.com> ++ * ++ * 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 <linux/interrupt.h> ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/reset.h> ++#include <linux/delay.h> ++#include <linux/slab.h> ++#include <linux/init.h> ++#include <linux/errno.h> ++#include <linux/platform_device.h> ++#include <linux/i2c.h> ++#include <linux/io.h> ++#include <linux/err.h> ++ ++#include <asm/mach-ralink/ralink_regs.h> ++ ++#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 BIT(1) ++#define I2C_CFG_DEVADDIS BIT(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 SM0_ODRAIN BIT(31) ++#define SM0_VSYNC_MODE BIT(28) ++#define SM0_CLK_DIV (CLKDIV_VALUE << 16) ++#define SM0_WAIT_LEVEL BIT(6) ++#define SM0_EN BIT(1) ++ ++#define SM0_CFG_DEFUALT (SM0_ODRAIN | SM0_VSYNC_MODE | \ ++ SM0_CLK_DIV | SM0_WAIT_LEVEL | \ ++ SM0_EN) ++/***********************************************************/ ++ ++static void __iomem *membase; ++static struct i2c_adapter *adapter; ++ ++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(struct i2c_adapter *a) ++{ ++ device_reset(a->dev.parent); ++} ++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(struct i2c_adapter *a) ++{ ++ mt7621_i2c_reset(a); ++ rt_i2c_w32(I2C_CFG_DEFAULT,REG_CONFIG_REG); ++ rt_i2c_w32(SM0_CFG_DEFUALT,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)) ++ i++; ++ if(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)) ++ i++; ++ if(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)) ++ i++; ++ if(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(a); ++ 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; ++ ++ adapter = devm_kzalloc(&pdev->dev,sizeof(struct i2c_adapter), GFP_KERNEL); ++ if (!adapter) { ++ dev_err(&pdev->dev, "failed to allocate i2c_adapter\n"); ++ return -ENOMEM; ++ } ++ membase = devm_ioremap_resource(&pdev->dev, res); ++ if (IS_ERR(membase)) ++ return PTR_ERR(membase); ++ ++ 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; ++ ++ platform_set_drvdata(pdev, adapter); ++ ++ ret = i2c_add_numbered_adapter(adapter); ++ if (ret) ++ return ret; ++ ++ dev_info(&pdev->dev,"loaded"); ++ ++ return 0; ++} ++ ++static int rt_i2c_remove(struct platform_device *pdev) ++{ ++ 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 <steven_liu@mediatek.com>"); ++MODULE_DESCRIPTION("MT7621 I2c host driver"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("platform:MT7621-I2C"); |