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ramips: add mt7621/3/8 support to the I2C driver

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Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 46959
This commit is contained in:
John Crispin 2015-09-16 08:31:15 +00:00
parent e6a9d5edf2
commit 3a149a2910
1 changed files with 34 additions and 9 deletions
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41
target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch
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@ -68,7 +68,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ralink.c
@@ -0,0 +1,302 @@
@@ -0,0 +1,327 @@
+/*
+ * drivers/i2c/busses/i2c-ralink.c
+ *
@ -97,6 +97,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/err.h>
@ -112,6 +113,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define REG_STATUS_REG 0x18
+#define REG_STARTXFR_REG 0x1C
+#define REG_BYTECNT_REG 0x20
+#define REG_SM0CFG2 0x28
+#define REG_SM0CTL0 0x40
+
+#define I2C_STARTERR BIT(4)
+#define I2C_ACKERR BIT(3)
@ -129,11 +132,23 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define WRITE_CMD 0x00
+#define READ_BLOCK 64
+
+#define SM0CTL0_OD BIT(31)
+#define SM0CTL0_VTRIG BIT(28)
+#define SM0CTL0_OUTHI BIT(6)
+#define SM0CTL0_STRETCH BIT(1)
+#define SM0CTL0_DEFAULT (SM0CTL0_OD | SM0CTL0_VTRIG | SM0CTL0_OUTHI | SM0CTL0_STRETCH)
+
+/* timeout waiting for I2C devices to respond (clock streching) */
+#define RT_I2C_TIMEOUT (msecs_to_jiffies(1000))
+
+enum {
+ I2C_TYPE_RALINK,
+ I2C_TYPE_MEDIATEK,
+};
+
+static void __iomem *membase;
+static struct i2c_adapter *adapter;
+static int hw_type;
+
+static void rt_i2c_w32(u32 val, unsigned reg)
+{
@ -267,7 +282,12 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+ rt_i2c_w32(m->addr, REG_DEVADDR_REG);
+ rt_i2c_w32(I2C_DEVADLEN_7 | I2C_ADDRDIS, REG_CONFIG_REG);
+ if (hw_type == I2C_TYPE_RALINK) {
+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG);
+ } else {
+ rt_i2c_w32((CLKDIV_VALUE << 16) | SM0CTL0_DEFAULT, REG_SM0CTL0);
+ rt_i2c_w32(1, REG_SM0CFG2);
+ }
+
+ for (i = 0; i < n && !ret; i++) {
+ ret = rt_i2c_handle_msg(a, &m[i]);
@ -290,11 +310,23 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ .functionality = rt_i2c_func,
+};
+
+static const struct of_device_id i2c_rt_dt_ids[] = {
+ { .compatible = "ralink,rt2880-i2c", .data = (void *) I2C_TYPE_RALINK },
+ { .compatible = "mediatek,mt7628-i2c", .data = (void *) I2C_TYPE_MEDIATEK },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
+
+static int rt_i2c_probe(struct platform_device *pdev)
+{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ const struct of_device_id *match;
+ int ret;
+
+ match = of_match_device(i2c_rt_dt_ids, &pdev->dev);
+ hw_type = (int) match->data;
+
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource found\n");
+ return -ENODEV;
@ -337,13 +369,6 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ return 0;
+}
+
+static const struct of_device_id i2c_rt_dt_ids[] = {
+ { .compatible = "ralink,rt2880-i2c", },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
+
+static struct platform_driver rt_i2c_driver = {
+ .probe = rt_i2c_probe,
+ .remove = rt_i2c_remove,