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