diff options
| author | John Crispin <john@openwrt.org> | 2015-09-16 08:31:15 +0000 |
|---|---|---|
| committer | John Crispin <john@openwrt.org> | 2015-09-16 08:31:15 +0000 |
| commit | 3a149a291052eec225984a263b4bd2528bbe3aae (patch) | |
| tree | 08d52871fc01b40399e5d00a1825579564289081 | |
| parent | e6a9d5edf2a037c8bf46a0a895a791086e6c9e93 (diff) | |
| download | mtk-20170518-3a149a291052eec225984a263b4bd2528bbe3aae.zip mtk-20170518-3a149a291052eec225984a263b4bd2528bbe3aae.tar.gz mtk-20170518-3a149a291052eec225984a263b4bd2528bbe3aae.tar.bz2 | |
ramips: add mt7621/3/8 support to the I2C driver
Signed-off-by: John Crispin <blogic@openwrt.org>
SVN-Revision: 46959
| -rw-r--r-- | target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch | 43 |
1 files changed, 34 insertions, 9 deletions
diff --git a/target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch index 0cf5542..5618652 100644 --- a/target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch +++ b/target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch @@ -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); -+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_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, |