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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>
This commit is contained in:
Nguyen Viet Dung 2013-09-03 09:09:25 +09:00 committed by Wolfram Sang
parent 617da00cb1
commit b720423a26
1 changed files with 33 additions and 2 deletions
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35
drivers/i2c/busses/i2c-rcar.c
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@ -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 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv,
/*
* 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);