X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fi2c%2Fmxc_i2c.c;h=ebde3c5ab253ca9fdb52f7ed0fa6652d3c2c5524;hb=30032710ed7259800cc4dbcba8741fef65e56186;hp=8e10fbb21ca96b207dce0b3660a0e415b2e85a38;hpb=952a6bdd77b6b0a780e76a0b17ad139f4ee6dfde;p=oweals%2Fu-boot.git

diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 8e10fbb21c..ebde3c5ab2 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -23,11 +23,12 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 
 #if defined(CONFIG_HARD_I2C)
 
-#include <asm/arch/mx31.h>
-#include <asm/arch/mx31-regs.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
 
 #define IADR	0x00
 #define IFDR	0x04
@@ -47,7 +48,7 @@
 #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 +57,202 @@
 #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;
 	/* 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);
+#endif
+	freq = mxc_get_clock(MXC_IPG_PERCLK);
 
 	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);
+
+	writew(i, I2C_BASE + IFDR);
+	i2c_reset();
+}
+
+static int wait_idle(void)
+{
+	int timeout = I2C_MAX_TIMEOUT;
 
-	__REG16(I2C_BASE + I2CR) = 0; /* Reset module */
-	__REG16(I2C_BASE + IFDR) = i;
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN;
-	__REG16(I2C_BASE + I2SR) = 0;
+	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 +260,9 @@ 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 +271,9 @@ 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;