i2c: sh_i2c.c: support iccl and icch extension
R-mobile SoC (at least SH73A0) has extension bits to store 8th bit of iccl and icch.
This patch add support for the extentin bits.
Acked-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
diff --git a/drivers/i2c/sh_i2c.c b/drivers/i2c/sh_i2c.c
index 3147123..035069f 100644
--- a/drivers/i2c/sh_i2c.c
+++ b/drivers/i2c/sh_i2c.c
@@ -48,7 +48,13 @@
#define SH_IC_WAIT (1 << 1)
#define SH_IC_DTE (1 << 0)
-static u8 iccl, icch;
+#ifdef CONFIG_SH_I2C_8BIT
+/* store 8th bit of iccl and icch in ICIC register */
+#define SH_I2C_ICIC_ICCLB8 (1 << 7)
+#define SH_I2C_ICIC_ICCHB8 (1 << 6)
+#endif
+
+static u16 iccl, icch;
#define IRQ_WAIT 1000
@@ -76,12 +82,20 @@
static void i2c_set_addr(struct sh_i2c *base, u8 id, u8 reg, int stop)
{
+ u8 icic = 0;
+
writeb(readb(&base->iccr) & ~SH_I2C_ICCR_ICE, &base->iccr);
writeb(readb(&base->iccr) | SH_I2C_ICCR_ICE, &base->iccr);
- writeb(iccl, &base->iccl);
- writeb(icch, &base->icch);
- writeb(0, &base->icic);
+ writeb(iccl & 0xff, &base->iccl);
+ writeb(icch & 0xff, &base->icch);
+#ifdef CONFIG_SH_I2C_8BIT
+ if (iccl > 0xff)
+ icic |= SH_I2C_ICIC_ICCLB8;
+ if (icch > 0xff)
+ icic |= SH_I2C_ICIC_ICCHB8;
+#endif
+ writeb(icic, &base->icic);
writeb((SH_I2C_ICCR_ICE|SH_I2C_ICCR_RTS|SH_I2C_ICCR_BUSY), &base->iccr);
irq_dte(base);
@@ -206,18 +220,18 @@
denom = speed * (CONFIG_SH_I2C_DATA_HIGH + CONFIG_SH_I2C_DATA_LOW);
tmp = num * 10 / denom;
if (tmp % 10 >= 5)
- iccl = (u8)((num/denom) + 1);
+ iccl = (u16)((num/denom) + 1);
else
- iccl = (u8)(num/denom);
+ iccl = (u16)(num/denom);
/* Calculate the value for icch. From the data sheet:
icch = (p clock / transfer rate) * (H / (L + H)) */
num = CONFIG_SH_I2C_CLOCK * CONFIG_SH_I2C_DATA_HIGH;
tmp = num * 10 / denom;
if (tmp % 10 >= 5)
- icch = (u8)((num/denom) + 1);
+ icch = (u16)((num/denom) + 1);
else
- icch = (u8)(num/denom);
+ icch = (u16)(num/denom);
}
/*