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Diffstat (limited to 'drivers/i2c/mxc_i2c.c')
-rw-r--r--drivers/i2c/mxc_i2c.c172
1 files changed, 127 insertions, 45 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 8e10fbb..c5ec486 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -23,11 +23,17 @@
*/
#include <common.h>
+#include <asm/io.h>
#if defined(CONFIG_HARD_I2C)
+#if defined(CONFIG_MX31)
#include <asm/arch/mx31.h>
#include <asm/arch/mx31-regs.h>
+#else
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
+#endif
#define IADR 0x00
#define IFDR 0x04
@@ -47,7 +53,7 @@
#define I2SR_IIF (1 << 1)
#define I2SR_RX_NO_AK (1 << 0)
-#ifdef CONFIG_SYS_I2C_MX31_PORT1
+#if defined(CONFIG_SYS_I2C_MX31_PORT1)
#define I2C_BASE 0x43f80000
#define I2C_CLK_OFFSET 26
#elif defined (CONFIG_SYS_I2C_MX31_PORT2)
@@ -56,130 +62,205 @@
#elif defined (CONFIG_SYS_I2C_MX31_PORT3)
#define I2C_BASE 0x43f84000
#define I2C_CLK_OFFSET 30
+#elif defined(CONFIG_SYS_I2C_MX53_PORT1)
+#define I2C_BASE I2C1_BASE_ADDR
+#elif defined(CONFIG_SYS_I2C_MX53_PORT2)
+#define I2C_BASE I2C2_BASE_ADDR
+#elif defined(CONFIG_SYS_I2C_MX35_PORT1)
+#define I2C_BASE I2C_BASE_ADDR
#else
-#error "define CONFIG_SYS_I2C_MX31_PORTx to use the mx31 I2C driver"
+#error "define CONFIG_SYS_I2C_MX<Processor>_PORTx to use the mx I2C driver"
#endif
-#ifdef DEBUG
-#define DPRINTF(args...) printf(args)
-#else
-#define DPRINTF(args...)
-#endif
+#define I2C_MAX_TIMEOUT 10000
+#define I2C_MAX_RETRIES 3
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 inline void i2c_reset(void)
+{
+ writew(0, I2C_BASE + I2CR); /* Reset module */
+ writew(0, I2C_BASE + I2SR);
+ writew(I2CR_IEN, I2C_BASE + I2CR);
+}
+
void i2c_init(int speed, int unused)
{
- int freq = mx31_get_ipg_clk();
+ int freq;
int i;
+#if defined(CONFIG_MX31)
+ struct clock_control_regs *sc_regs =
+ (struct clock_control_regs *)CCM_BASE;
+
+ freq = mx31_get_ipg_clk();
/* start the required I2C clock */
- __REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET);
+ writel(readl(&sc_regs->cgr0) | (3 << I2C_CLK_OFFSET),
+ &sc_regs->cgr0);
+#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);
+ debug("%s: speed: %d\n", __func__, speed);
- __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
- __REG16(I2C_BASE + IFDR) = i;
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
- __REG16(I2C_BASE + I2SR) = 0;
+ writew(i, I2C_BASE + IFDR);
+ i2c_reset();
+}
+
+static int wait_idle(void)
+{
+ int timeout = I2C_MAX_TIMEOUT;
+
+ while ((readw(I2C_BASE + I2SR) & I2SR_IBB) && --timeout) {
+ writew(0, I2C_BASE + I2SR);
+ udelay(1);
+ }
+ return timeout ? timeout : (!(readw(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)
+ while (!(readw(I2C_BASE + I2SR) & I2SR_IBB) && --timeout)
udelay(1);
- __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
+ writew(0, I2C_BASE + I2SR); /* clear interrupt */
return timeout;
}
+static int wait_complete(void)
+{
+ int timeout = I2C_MAX_TIMEOUT;
+
+ while ((!(readw(I2C_BASE + I2SR) & I2SR_ICF)) && (--timeout)) {
+ writew(0, I2C_BASE + I2SR);
+ udelay(1);
+ }
+ udelay(200);
+
+ writew(0, I2C_BASE + I2SR); /* clear interrupt */
+
+ return timeout;
+}
+
+
static int tx_byte(u8 byte)
{
- __REG16(I2C_BASE + I2DR) = byte;
+ writew(byte, I2C_BASE + I2DR);
- if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)
+ if (!wait_complete() || readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK)
return -1;
return 0;
}
-static int rx_byte(void)
+static int rx_byte(int last)
{
- if (!wait_busy())
+ if (!wait_complete())
return -1;
- return __REG16(I2C_BASE + I2DR);
+ if (last)
+ writew(I2CR_IEN, I2C_BASE + I2CR);
+
+ return readw(I2C_BASE + I2DR);
}
int i2c_probe(uchar chip)
{
int ret;
- __REG16(I2C_BASE + I2CR) = 0; /* Reset module */
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
+ writew(0, I2C_BASE + I2CR); /* Reset module */
+ writew(I2CR_IEN, I2C_BASE + I2CR);
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX;
+ writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR);
ret = tx_byte(chip << 1);
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX;
+ writew(I2CR_IEN | I2CR_MTX, I2C_BASE + I2CR);
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;
+ 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(1);
+ }
+ if (retry >= I2C_MAX_RETRIES) {
+ debug("%s:bus is busy(%x)\n",
+ __func__, readw(I2C_BASE + I2SR));
+ return -1;
+ }
+ writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR);
- if (tx_byte(chip << 1))
+ if (!wait_busy()) {
+ debug("%s:trigger start fail(%x)\n",
+ __func__, readw(I2C_BASE + I2SR));
return -1;
+ }
+ if (tx_byte(chip << 1) || (readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK)) {
+ debug("%s:chip address cycle fail(%x)\n",
+ __func__, readw(I2C_BASE + I2SR));
+ return -1;
+ }
while (alen--)
- if (tx_byte((addr >> (alen * 8)) & 0xff))
+ if (tx_byte((addr >> (alen * 8)) & 0xff) ||
+ (readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK)) {
+ debug("%s:device address cycle fail(%x)\n",
+ __func__, readw(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);
+ debug("%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;
+ writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA, I2C_BASE + I2CR);
if (tx_byte(chip << 1 | 1))
return -1;
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | ((len == 1) ? I2CR_TX_NO_AK : 0);
+ writew(I2CR_IEN | I2CR_MSTA |
+ ((len == 1) ? I2CR_TX_NO_AK : 0),
+ I2C_BASE + I2CR);
- ret = __REG16(I2C_BASE + I2DR);
+ ret = readw(I2C_BASE + I2DR);
while (len--) {
- if ((ret = rx_byte()) < 0)
+ ret = rx_byte(len == 0);
+ if (ret < 0)
return -1;
*buf++ = ret;
if (len <= 1)
- __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_TX_NO_AK;
+ writew(I2CR_IEN | I2CR_MSTA |
+ I2CR_TX_NO_AK,
+ I2C_BASE + I2CR);
}
- wait_busy();
-
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
+ writew(I2CR_IEN, I2C_BASE + I2CR);
- while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
+ while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
udelay(1);
return 0;
@@ -187,8 +268,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
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;
+ debug("%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;
@@ -197,9 +279,9 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
if (tx_byte(*buf++))
return -1;
- __REG16(I2C_BASE + I2CR) = I2CR_IEN;
+ writew(I2CR_IEN, I2C_BASE + I2CR);
- while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
+ while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
udelay(1);
return 0;
generated by cgit v1.1 at 2024-11-26 10:02:11 +0000