Add support for I2C in i.MX27 chip.
Tested on imx27_visstrim_m10 board.
Signed-off-by: Javier Martin <javier.mar...@vista-silicon.com>
--
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 8e10fbb..63a8085 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -2,6 +2,8 @@
* i2c driver for Freescale mx31
*
* (c) 2007 Pengutronix, Sascha Hauer <s.ha...@pengutronix.de>
+ * (c) 2009 Vista Silicon, Javier Martin
+ * <javier.mar...@vista-silicon.com>
*
* See file CREDITS for list of people who contributed to this
* project.
@@ -21,13 +23,19 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
-
#include <common.h>
#if defined(CONFIG_HARD_I2C)
+#ifdef CONFIG_MX31
#include <asm/arch/mx31.h>
#include <asm/arch/mx31-regs.h>
+#elif defined (CONFIG_MX27)
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/asm-offsets.h>
+#else
+#error "architecture not supported by mxc_i2c driver"
+#endif
#define IADR 0x00
#define IFDR 0x04
@@ -47,6 +55,7 @@
#define I2SR_IIF (1 << 1)
#define I2SR_RX_NO_AK (1 << 0)
+#ifdef CONFIG_MX31
#ifdef CONFIG_SYS_I2C_MX31_PORT1
#define I2C_BASE 0x43f80000
#define I2C_CLK_OFFSET 26
@@ -59,6 +68,18 @@
#else
#error "define CONFIG_SYS_I2C_MX31_PORTx to use the mx31 I2C driver"
#endif
+#endif /* CONFIG_MX31 */
+
+#ifdef CONFIG_MX27
+#ifdef CONFIG_SYS_I2C_MX27_PORT1
+#define I2C_BASE IMX_I2C1_BASE
+#elif defined (CONFIG_SYS_I2C_MX27_PORT2)
+#define I2C_BASE IMX_I2C2_BASE
+#else
+#error "define CONFIG_SYS_I2C_MX27_PORTx to use the mx27 I2C driver"
+#endif
+#endif /* CONFIG_MX27 */
+
#ifdef DEBUG
#define DPRINTF(args...) printf(args)
@@ -70,17 +91,37 @@ static u16 div[] = { 30, 32, 36, 42, 48, 52, 60, 72, 80,
88, 104, 128, 144,
160, 192, 240, 288, 320, 384, 480, 576, 640, 768, 960,
1152, 1280, 1536, 1920, 2304, 2560, 3072, 3840};
+static void i2c_clken(void)
+{
+#ifdef CONFIG_MX31
+ __REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET);
+#elif defined(CONFIG_MX27)
+#ifdef CONFIG_SYS_I2C_MX27_PORT1
+ __REG(PCCR0) = __REG(PCCR0) | PCCR0_I2C1_EN;
+#else
+ __REG(PCCR0) = __REG(PCCR0) | PCCR0_I2C2_EN;
+#endif
+#endif /* CONFIG_MX31 */
+}
+
void i2c_init(int speed, int unused)
{
- int freq = mx31_get_ipg_clk();
+ int freq;
int i;
+#ifdef CONFIG_MX31
+ freq = mx31_get_ipg_clk();
+#elif defined(CONFIG_MX27)
+ freq = imx_get_ipgclk();
+#endif
/* start the required I2C clock */
- __REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET);
+ i2c_clken();
+ DPRINTF("ipg_freq is %d\n", freq);
for (i = 0; i < 0x1f; i++)
if (freq / div[i] <= speed)
break;
+ DPRINTF("i2c_clk divisor is %d\n", div[i]);
DPRINTF("%s: speed: %d\n",__FUNCTION__, speed);
@@ -121,7 +162,6 @@ static int rx_byte(void)
int i2c_probe(uchar chip)
{
int ret;
-
__REG16(I2C_BASE + I2CR) = 0; /* Reset module */
__REG16(I2C_BASE + I2CR) = I2CR_IEN;
--
Javier Martin
Vista Silicon S.L.
CDTUC - FASE C - Oficina S-345
Avda de los Castros s/n
39005- Santander. Cantabria. Spain
+34 942 25 32 60
www.vista-silicon.com
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