From: Magnus Damm <[email protected]> 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 <[email protected]> Signed-off-by: Magnus Damm <[email protected]> --- drivers/i2c/busses/i2c-sh_mobile.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) --- 0026/drivers/i2c/busses/i2c-sh_mobile.c +++ work/drivers/i2c/busses/i2c-sh_mobile.c 2010-03-11 15:33:09.000000000 +0900 @@ -118,8 +118,10 @@ 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; @@ -128,6 +130,8 @@ struct sh_mobile_i2c_data { int sr; }; +#define IIC_FLAG_HAS_ICIC67 (1 << 0) + #define NORMAL_SPEED 100000 /* FAST_SPEED 400000 */ /* Register offsets */ @@ -154,6 +158,8 @@ 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 @@ -161,6 +167,9 @@ 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); } @@ -202,6 +211,14 @@ static void activate_ch(struct sh_mobile 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; @@ -211,6 +228,14 @@ static void activate_ch(struct sh_mobile 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); @@ -591,6 +616,12 @@ static int sh_mobile_i2c_probe(struct pl 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 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
