ralink: MT7621 add i2c controller driver

ralink i2c driver is not working on MT7621 platform. Porting a new drivers from MTK's source code.
Last time i got some mess . This is new version.

Signed-off-by: Jay Weng <fl.service@t-firefly.com>

SVN-Revision: 45018

1 files changed, 335 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-3.18/0111-i2c-MIPS-add-mt7621-I2C-driver.patch b/target/linux/ramips/patches-3.18/0111-i2c-MIPS-add-mt7621-I2C-driver.patch
new file mode 100755
index 0000000..5df95f4
--- /dev/null
+++ b/target/linux/ramips/patches-3.18/0111-i2c-MIPS-add-mt7621-I2C-driver.patch
@@ -0,0 +1,335 @@
+Index: linux-3.18.9/drivers/i2c/busses/Kconfig
+===================================================================
+--- linux-3.18.9.orig/drivers/i2c/busses/Kconfig	2015-03-23 15:00:11.730403938 +0800
++++ linux-3.18.9/drivers/i2c/busses/Kconfig	2015-03-23 15:00:11.982403926 +0800
+@@ -714,6 +714,10 @@
+ 	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-3.18.9/drivers/i2c/busses/Makefile
+===================================================================
+--- linux-3.18.9.orig/drivers/i2c/busses/Makefile	2015-03-23 15:00:11.730403938 +0800
++++ linux-3.18.9/drivers/i2c/busses/Makefile	2015-03-23 15:00:11.982403926 +0800
+@@ -67,6 +67,7 @@
+ 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-$(CONFIG_I2C_QUP)		+= i2c-qup.o
+ obj-$(CONFIG_I2C_RIIC)		+= i2c-riic.o
+ obj-$(CONFIG_I2C_RK3X)		+= i2c-rk3x.o
+Index: linux-3.18.9/drivers/i2c/busses/i2c-mt7621.c
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-3.18.9/drivers/i2c/busses/i2c-mt7621.c	2015-03-23 16:31:42.684747034 +0800
+@@ -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");