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authorMarek Vasut <marek.vasut@gmail.com>2011-09-27 06:34:11 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-10-27 21:56:30 +0200
commitb567b8ff793e7048d9c0fc2ddf73998d2d7c0052 (patch)
treed132a55c1d4357b581c2f3745c41e114137f359f
parent47af6f61bcd9fdd5dcf389cff0a7406eba756c6f (diff)
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I2C: Add i2c_get/set_speed() to mxc_i2c.c
Signed-off-by: Marek Vasut <marek.vasut@gmail.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Heiko Schocher <hs@denx.de> Acked-by: Heiko Schocher <hs@denx.de>
-rw-r--r--drivers/i2c/mxc_i2c.c31
1 files changed, 23 insertions, 8 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index a805bf6..2869d7c 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -95,7 +95,7 @@ static u16 i2c_clk_div[50][2] = {
{ 3072, 0x1E }, { 3840, 0x1F }
};
-static u8 clk_idx;
+static u8 clk_div;
/*
* Calculate and set proper clock divider
@@ -105,7 +105,6 @@ static void i2c_imx_set_clk(unsigned int rate)
struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)I2C_BASE;
unsigned int i2c_clk_rate;
unsigned int div;
- int i;
#if defined(CONFIG_MX31)
struct clock_control_regs *sc_regs =
@@ -120,16 +119,15 @@ static void i2c_imx_set_clk(unsigned int rate)
i2c_clk_rate = mxc_get_clock(MXC_IPG_PERCLK);
div = (i2c_clk_rate + rate - 1) / rate;
if (div < i2c_clk_div[0][0])
- i = 0;
+ clk_div = 0;
else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
- i = ARRAY_SIZE(i2c_clk_div) - 1;
+ clk_div = ARRAY_SIZE(i2c_clk_div) - 1;
else
- for (i = 0; i2c_clk_div[i][0] < div; i++)
+ for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++)
;
/* Store divider value */
- clk_idx = i2c_clk_div[i][1];
- writeb(clk_idx, &i2c_regs->ifdr);
+ writeb(i2c_clk_div[clk_div][1], &i2c_regs->ifdr);
}
/*
@@ -153,6 +151,23 @@ void i2c_init(int speed, int unused)
}
/*
+ * Set I2C Speed
+ */
+int i2c_set_bus_speed(unsigned int speed)
+{
+ i2c_init(speed, 0);
+ return 0;
+}
+
+/*
+ * Get I2C Speed
+ */
+unsigned int i2c_get_bus_speed(void)
+{
+ return mxc_get_clock(MXC_IPG_PERCLK) / i2c_clk_div[clk_div][0];
+}
+
+/*
* Wait for bus to be busy (or free if for_busy = 0)
*
* for_busy = 1: Wait for IBB to be asserted
@@ -218,7 +233,7 @@ int i2c_imx_start(void)
unsigned int temp = 0;
int result;
- writeb(clk_idx, &i2c_regs->ifdr);
+ writeb(i2c_clk_div[clk_div][1], &i2c_regs->ifdr);
/* Enable I2C controller */
writeb(0, &i2c_regs->i2sr);