+++ /dev/null
-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");
projects / openwrt / svn-archive / archive.git / blobdiff