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openwrt-owl/target/linux/ramips/patches-3.14/0111-i2c-MIPS-add-mt7621-I2...

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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 <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 (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))
+ 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();
+ 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 <steven_liu@mediatek.com>");
+MODULE_DESCRIPTION("MT7621 I2c host driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:MT7621-I2C");
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