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Diffstat (limited to 'drivers/i2c/mxc_i2c.c')
-rw-r--r--drivers/i2c/mxc_i2c.c210
1 files changed, 150 insertions, 60 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 8e10fbb..1f36970 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -3,6 +3,8 @@
*
* (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
*
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
* See file CREDITS for list of people who contributed to this
* project.
*
@@ -26,8 +28,14 @@
#if defined(CONFIG_HARD_I2C)
+#ifdef CONFIG_MX31
#include <asm/arch/mx31.h>
#include <asm/arch/mx31-regs.h>
+#elif defined(CONFIG_MX35)
+#include <asm/arch/mx35.h>
+#else
+#error "Please include specific headfile "
+#endif
#define IADR 0x00
#define IFDR 0x04
@@ -47,19 +55,17 @@
#define I2SR_IIF (1 << 1)
#define I2SR_RX_NO_AK (1 << 0)
-#ifdef CONFIG_SYS_I2C_MX31_PORT1
-#define I2C_BASE 0x43f80000
-#define I2C_CLK_OFFSET 26
-#elif defined (CONFIG_SYS_I2C_MX31_PORT2)
-#define I2C_BASE 0x43f98000
-#define I2C_CLK_OFFSET 28
-#elif defined (CONFIG_SYS_I2C_MX31_PORT3)
-#define I2C_BASE 0x43f84000
-#define I2C_CLK_OFFSET 30
+#ifdef CONFIG_SYS_I2C_PORT
+# define I2C_BASE CONFIG_SYS_I2C_PORT
#else
-#error "define CONFIG_SYS_I2C_MX31_PORTx to use the mx31 I2C driver"
+# error "define CFG_I2C_PORT(I2C base address) to use the I2C driver"
#endif
+#define I2C_MAX_TIMEOUT 100000
+#define I2C_TIMEOUT_TICKET 1
+
+#undef DEBUG
+
#ifdef DEBUG
#define DPRINTF(args...) printf(args)
#else
@@ -67,36 +73,77 @@
#endif
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};
+ 160, 192, 240, 288, 320, 384, 480, 576, 640, 768, 960,
+ 1152, 1280, 1536, 1920, 2304, 2560, 3072, 3840
+};
+
+static inline void i2c_reset(void)
+{
+ __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
+ __REG16(I2C_BASE + I2SR) = 0;
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN;
+}
void i2c_init(int speed, int unused)
{
- int freq = mx31_get_ipg_clk();
+ int freq;
int i;
- /* start the required I2C clock */
- __REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET);
-
- for (i = 0; i < 0x1f; i++)
+#ifdef CONFIG_MX31
+ freq = mx31_get_ipg_clk();
+#else
+ freq = mxc_get_clock(MXC_IPG_PERCLK);
+#endif
+ For (i = 0; i < 0x1f; i++)
if (freq / div[i] <= speed)
break;
- DPRINTF("%s: speed: %d\n",__FUNCTION__, speed);
+ DPRINTF("%s: root clock: %d, speed: %d div: %x\n",
+ __func__, freq, speed, i);
- __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
__REG16(I2C_BASE + IFDR) = i;
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
- __REG16(I2C_BASE + I2SR) = 0;
+ i2c_reset();
+}
+
+static int wait_idle(void)
+{
+ int timeout = I2C_MAX_TIMEOUT;
+
+ while ((__REG16(I2C_BASE + I2SR) & I2SR_IBB) && --timeout) {
+ __REG16(I2C_BASE + I2SR) = 0;
+ udelay(I2C_TIMEOUT_TICKET);
+ }
+ DPRINTF("%s:%x\n", __func__, __REG16(I2C_BASE + I2SR));
+ return timeout ? timeout : (!(__REG16(I2C_BASE + I2SR) & I2SR_IBB));
}
static int wait_busy(void)
{
- int timeout = 10000;
+ int timeout = I2C_MAX_TIMEOUT;
- while (!(__REG16(I2C_BASE + I2SR) & I2SR_IIF) && --timeout)
- udelay(1);
- __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
+ while ((!(__REG16(I2C_BASE + I2SR) & I2SR_IBB) && (--timeout))) {
+ __REG16(I2C_BASE + I2SR) = 0;
+ udelay(I2C_TIMEOUT_TICKET);
+ }
+ return timeout ? timeout : (__REG16(I2C_BASE + I2SR) & I2SR_IBB);
+}
+
+static int wait_complete(void)
+{
+ int timeout = I2C_MAX_TIMEOUT;
+
+ while ((!(__REG16(I2C_BASE + I2SR) & I2SR_ICF)) && (--timeout)) {
+ __REG16(I2C_BASE + I2SR) = 0;
+ udelay(I2C_TIMEOUT_TICKET);
+ }
+ DPRINTF("%s:%x\n", __func__, __REG16(I2C_BASE + I2SR));
+ {
+ int i;
+ for (i = 0; i < 200; i++)
+ udelay(10);
+
+ }
+ __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
return timeout;
}
@@ -105,90 +152,133 @@ static int tx_byte(u8 byte)
{
__REG16(I2C_BASE + I2DR) = byte;
- if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)
+ if (!wait_complete() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK) {
+ DPRINTF("%s:%x <= %x\n", __func__, __REG16(I2C_BASE + I2SR),
+ byte);
return -1;
+ }
+ DPRINTF("%s:%x\n", __func__, byte);
return 0;
}
-static int rx_byte(void)
+static int rx_byte(u32 *pdata, int last)
{
- if (!wait_busy())
+ if (!wait_complete())
return -1;
- return __REG16(I2C_BASE + I2DR);
+ if (last)
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN;
+
+ *pdata = __REG16(I2C_BASE + I2DR);
+ DPRINTF("%s:%x\n", __func__, *pdata);
+ return 0;
}
int i2c_probe(uchar chip)
{
int ret;
- __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
+ __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
__REG16(I2C_BASE + I2CR) = I2CR_IEN;
-
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX;
+ for (ret = 0; ret < 1000; ret++)
+ udelay(1);
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX;
ret = tx_byte(chip << 1);
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX;
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN;
return ret;
}
static int i2c_addr(uchar chip, uint addr, int alen)
{
- __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX;
-
- if (tx_byte(chip << 1))
+ int i, retry = 0;
+ for (retry = 0; retry < 3; retry++) {
+ if (wait_idle())
+ break;
+ i2c_reset();
+ for (i = 0; i < I2C_MAX_TIMEOUT; i++)
+ udelay(I2C_TIMEOUT_TICKET);
+ }
+ if (retry >= 3) {
+ printf("%s:bus is busy(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
return -1;
-
+ }
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX;
+ if (!wait_busy()) {
+ printf("%s:trigger start fail(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
+ return -1;
+ }
+ if (tx_byte(chip << 1) || (__REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)) {
+ printf("%s:chip address cycle fail(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
+ return -1;
+ }
while (alen--)
- if (tx_byte((addr >> (alen * 8)) & 0xff))
+ if (tx_byte((addr >> (alen * 8)) & 0xff) ||
+ (__REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)) {
+ printf("%s:device address cycle fail(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
return -1;
+ }
return 0;
}
int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
{
- int timeout = 10000;
+ int timeout = I2C_MAX_TIMEOUT;
int ret;
- DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len);
+ DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",
+ __func__, chip, addr, alen, len);
if (i2c_addr(chip, addr, alen)) {
printf("i2c_addr failed\n");
return -1;
}
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA;
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA;
- if (tx_byte(chip << 1 | 1))
+ if (tx_byte(chip << 1 | 1) ||
+ (__REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)) {
+ printf("%s:Send 2th chip address fail(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
return -1;
-
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | ((len == 1) ? I2CR_TX_NO_AK : 0);
-
+ }
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA |
+ ((len == 1) ? I2CR_TX_NO_AK : 0);
+ DPRINTF("CR=%x\n", __REG16(I2C_BASE + I2CR));
ret = __REG16(I2C_BASE + I2DR);
while (len--) {
- if ((ret = rx_byte()) < 0)
+ if (len == 1)
+ __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA |
+ I2CR_TX_NO_AK;
+
+ if (rx_byte(&ret, len == 0) < 0) {
+ printf("Read: rx_byte fail\n");
return -1;
+ }
*buf++ = ret;
- if (len <= 1)
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_TX_NO_AK;
}
- wait_busy();
-
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
-
- while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
- udelay(1);
-
+ while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) {
+ __REG16(I2C_BASE + I2SR) = 0;
+ udelay(I2C_TIMEOUT_TICKET);
+ }
+ if (!timeout) {
+ printf("%s:trigger stop fail(%x)\n",
+ __func__, __REG16(I2C_BASE + I2SR));
+ }
return 0;
}
int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
{
- int timeout = 10000;
- DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len);
+ int timeout = I2C_MAX_TIMEOUT;
+ DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",
+ __func__, chip, addr, alen, len);
if (i2c_addr(chip, addr, alen))
return -1;
@@ -200,9 +290,9 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
__REG16(I2C_BASE + I2CR) = I2CR_IEN;
while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
- udelay(1);
+ udelay(I2C_TIMEOUT_TICKET);
return 0;
}
-#endif /* CONFIG_HARD_I2C */
+#endif /* CONFIG_HARD_I2C */
generated by cgit v1.1 at 2024-12-24 09:51:32 +0000