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i2c: i2c-sh_mobile support for new ICIC bits 

Add support for a new version of the IIC block
found in the SH-Mobile ARM line of processors.

Prototype patch written by Nishimoto-san.
Tested on sh7377 and sh7372.

Signed-off-by: NISHIMOTO Hiroki <nishimoto.hiroki@renesas.com>
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2010-03-11 10:06:02 +00:00 committed by Paul Mundt
parent 12a55f2db7
commit 962b6032c8
1 changed files with 31 additions and 0 deletions
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31
drivers/i2c/busses/i2c-sh_mobile.c
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@ -119,8 +119,10 @@ struct sh_mobile_i2c_data {
struct i2c_adapter adap;
struct clk *clk;
u_int8_t icic;
u_int8_t iccl;
u_int8_t icch;
u_int8_t flags;
spinlock_t lock;
wait_queue_head_t wait;
@ -129,6 +131,8 @@ struct sh_mobile_i2c_data {
int sr;
};
#define IIC_FLAG_HAS_ICIC67 (1 << 0)
#define NORMAL_SPEED 100000 /* FAST_SPEED 400000 */
/* Register offsets */
@ -155,6 +159,8 @@ struct sh_mobile_i2c_data {
#define ICSR_WAIT 0x02
#define ICSR_DTE 0x01
#define ICIC_ICCLB8 0x80
#define ICIC_ICCHB8 0x40
#define ICIC_ALE 0x08
#define ICIC_TACKE 0x04
#define ICIC_WAITE 0x02
@ -162,6 +168,9 @@ struct sh_mobile_i2c_data {
static void iic_wr(struct sh_mobile_i2c_data *pd, int offs, unsigned char data)
{
if (offs == ICIC)
data |= pd->icic;
iowrite8(data, pd->reg + offs);
}
@ -203,6 +212,14 @@ static void activate_ch(struct sh_mobile_i2c_data *pd)
else
pd->iccl = (u_int8_t)(num/denom);
/* one more bit of ICCL in ICIC */
if (pd->flags & IIC_FLAG_HAS_ICIC67) {
if ((num/denom) > 0xff)
pd->icic |= ICIC_ICCLB8;
else
pd->icic &= ~ICIC_ICCLB8;
}
/* Calculate the value for icch. From the data sheet:
icch = (p clock / transfer rate) * (H / (L + H)) */
num = i2c_clk * 4;
@ -212,6 +229,14 @@ static void activate_ch(struct sh_mobile_i2c_data *pd)
else
pd->icch = (u_int8_t)(num/denom);
/* one more bit of ICCH in ICIC */
if (pd->flags & IIC_FLAG_HAS_ICIC67) {
if ((num/denom) > 0xff)
pd->icic |= ICIC_ICCHB8;
else
pd->icic &= ~ICIC_ICCHB8;
}
/* Enable channel and configure rx ack */
iic_set_clr(pd, ICCR, ICCR_ICE, 0);
@ -592,6 +617,12 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
goto err_irq;
}
/* The IIC blocks on SH-Mobile ARM processors
* come with two new bits in ICIC.
*/
if (size > 0x17)
pd->flags |= IIC_FLAG_HAS_ICIC67;
/* Enable Runtime PM for this device.
*
* Also tell the Runtime PM core to ignore children