diff options
| author | Nguyen Viet Dung <nv-dung@jinso.co.jp> | 2013-09-03 09:09:25 +0900 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2013-09-04 11:49:16 +0100 |
| commit | b720423a2627f045133bec39a31fe2bc0dab86f3 (patch) | |
| tree | 8b75444c4c435016fd24646a7ac64b9c452522c0 | |
| parent | 617da00cb11b75a17a271147e616296f754f591b (diff) | |
i2c: rcar: add rcar-H2 support
This patch modify I2C driver of rcar-H1 to usable on both rcar-H1 and rcar-H2.
Signed-off-by: Nguyen Viet Dung <nv-dung@jinso.co.jp>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-rcar.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index e59c3f618542..d2fe11da5e82 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -101,6 +101,11 @@ enum { #define ID_ARBLOST (1 << 3) #define ID_NACK (1 << 4) +enum rcar_i2c_type { + I2C_RCAR_H1, + I2C_RCAR_H2, +}; + struct rcar_i2c_priv { void __iomem *io; struct i2c_adapter adap; @@ -113,6 +118,7 @@ struct rcar_i2c_priv { int irq; u32 icccr; u32 flags; + enum rcar_i2c_type devtype; }; #define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent) @@ -224,12 +230,25 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, u32 scgd, cdf; u32 round, ick; u32 scl; + u32 cdf_width; if (!clkp) { dev_err(dev, "there is no peripheral_clk\n"); return -EIO; } + switch (priv->devtype) { + case I2C_RCAR_H1: + cdf_width = 2; + break; + case I2C_RCAR_H2: + cdf_width = 3; + break; + default: + dev_err(dev, "device type error\n"); + return -EIO; + } + /* * calculate SCL clock * see @@ -245,7 +264,7 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, * clkp : peripheral_clk * F[] : integer up-valuation */ - for (cdf = 0; cdf < 4; cdf++) { + for (cdf = 0; cdf < (1 << cdf_width); cdf++) { ick = clk_get_rate(clkp) / (1 + cdf); if (ick < 20000000) goto ick_find; @@ -287,7 +306,7 @@ scgd_find: /* * keep icccr value */ - priv->icccr = (scgd << 2 | cdf); + priv->icccr = (scgd << (cdf_width) | cdf); return 0; } @@ -632,6 +651,9 @@ static int rcar_i2c_probe(struct platform_device *pdev) bus_speed = 100000; /* default 100 kHz */ if (pdata && pdata->bus_speed) bus_speed = pdata->bus_speed; + + priv->devtype = platform_get_device_id(pdev)->driver_data; + ret = rcar_i2c_clock_calculate(priv, bus_speed, dev); if (ret < 0) return ret; @@ -686,6 +708,14 @@ static int rcar_i2c_remove(struct platform_device *pdev) return 0; } +static struct platform_device_id rcar_i2c_id_table[] = { + { "i2c-rcar", I2C_RCAR_H1 }, + { "i2c-rcar_h1", I2C_RCAR_H1 }, + { "i2c-rcar_h2", I2C_RCAR_H2 }, + {}, +}; +MODULE_DEVICE_TABLE(platform, rcar_i2c_id_table); + static struct platform_driver rcar_i2c_driver = { .driver = { .name = "i2c-rcar", @@ -693,6 +723,7 @@ static struct platform_driver rcar_i2c_driver = { }, .probe = rcar_i2c_probe, .remove = rcar_i2c_remove, + .id_table = rcar_i2c_id_table, }; module_platform_driver(rcar_i2c_driver); |