X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fi2c%2Ffsl_i2c.c;h=ff7f25a0ef7cdf2ce46cecc7954e654bc0d0d853;hb=c8434ccaceb987babfc925fe86db473a44352cf4;hp=291ad946dba19a8b358b4be6fe3c12be018d73a1;hpb=3be2bdf5dc69b3142c1162a59bc67191c9077567;p=oweals%2Fu-boot.git

diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
index 291ad946db..ff7f25a0ef 100644
--- a/drivers/i2c/fsl_i2c.c
+++ b/drivers/i2c/fsl_i2c.c
@@ -38,7 +38,7 @@
  * generic value.
  */
 #ifndef CONFIG_I2C_TIMEOUT
-#define CONFIG_I2C_TIMEOUT	10000
+#define CONFIG_I2C_TIMEOUT	100000
 #endif
 
 #define I2C_READ_BIT  1
@@ -46,10 +46,16 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static const struct fsl_i2c *i2c_dev[2] = {
+static const struct fsl_i2c *i2c_dev[4] = {
 	(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C_OFFSET),
 #ifdef CONFIG_SYS_FSL_I2C2_OFFSET
-	(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C2_OFFSET)
+	(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C2_OFFSET),
+#endif
+#ifdef CONFIG_SYS_FSL_I2C3_OFFSET
+	(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C3_OFFSET),
+#endif
+#ifdef CONFIG_SYS_FSL_I2C4_OFFSET
+	(struct fsl_i2c *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C4_OFFSET)
 #endif
 };
 
@@ -121,7 +127,7 @@ static const struct {
 static unsigned int set_i2c_bus_speed(const struct fsl_i2c *dev,
 	unsigned int i2c_clk, unsigned int speed)
 {
-	unsigned short divider = min(i2c_clk / speed, (unsigned short) -1);
+	unsigned short divider = min(i2c_clk / speed, (unsigned int)USHRT_MAX);
 
 	/*
 	 * We want to choose an FDR/DFSR that generates an I2C bus speed that
@@ -423,18 +429,45 @@ fsl_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr, int alen, u8 *data,
 	struct fsl_i2c *device = (struct fsl_i2c *)i2c_dev[adap->hwadapnr];
 	int i = -1; /* signal error */
 	u8 *a = (u8*)&addr;
+	int len = alen * -1;
 
 	if (i2c_wait4bus(adap) < 0)
 		return -1;
 
-	if ((!length || alen > 0)
-	    && i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0
-	    && __i2c_write(adap, &a[4 - alen], alen) == alen)
-		i = 0; /* No error so far */
+	/* To handle the need of I2C devices that require to write few bytes
+	 * (more than 4 bytes of address as in the case of else part)
+	 * of data before reading, Negative equivalent of length(bytes to write)
+	 * is passed, but used the +ve part of len for writing data
+	 */
+	if (alen < 0) {
+		/* Generate a START and send the Address and
+		 * the Tx Bytes to the slave.
+		 * "START: Address: Write bytes data[len]"
+		 * IF part supports writing any number of bytes in contrast
+		 * to the else part, which supports writing address offset
+		 * of upto 4 bytes only.
+		 * bytes that need to be written are passed in
+		 * "data", which will eventually keep the data READ,
+		 * after writing the len bytes out of it
+		 */
+		if (i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0)
+			i = __i2c_write(adap, data, len);
+
+		if (i != len)
+			return -1;
 
-	if (length &&
-	    i2c_write_addr(adap, dev, I2C_READ_BIT, alen ? 1 : 0) != 0)
-		i = __i2c_read(adap, data, length);
+		if (length && i2c_write_addr(adap, dev, I2C_READ_BIT, 1) != 0)
+			i = __i2c_read(adap, data, length);
+	} else {
+		if ((!length || alen > 0) &&
+		    i2c_write_addr(adap, dev, I2C_WRITE_BIT, 0) != 0  &&
+		    __i2c_write(adap, &a[4 - alen], alen) == alen)
+			i = 0; /* No error so far */
+
+		if (length &&
+		    i2c_write_addr(adap, dev, I2C_READ_BIT, alen ? 1 : 0) != 0)
+			i = __i2c_read(adap, data, length);
+	}
 
 	writeb(I2C_CR_MEN, &device->cr);
 
@@ -512,3 +545,15 @@ U_BOOT_I2C_ADAP_COMPLETE(fsl_1, fsl_i2c_init, fsl_i2c_probe, fsl_i2c_read,
 			 CONFIG_SYS_FSL_I2C2_SPEED, CONFIG_SYS_FSL_I2C2_SLAVE,
 			 1)
 #endif
+#ifdef CONFIG_SYS_FSL_I2C3_OFFSET
+U_BOOT_I2C_ADAP_COMPLETE(fsl_2, fsl_i2c_init, fsl_i2c_probe, fsl_i2c_read,
+			 fsl_i2c_write, fsl_i2c_set_bus_speed,
+			 CONFIG_SYS_FSL_I2C3_SPEED, CONFIG_SYS_FSL_I2C3_SLAVE,
+			 2)
+#endif
+#ifdef CONFIG_SYS_FSL_I2C4_OFFSET
+U_BOOT_I2C_ADAP_COMPLETE(fsl_3, fsl_i2c_init, fsl_i2c_probe, fsl_i2c_read,
+			 fsl_i2c_write, fsl_i2c_set_bus_speed,
+			 CONFIG_SYS_FSL_I2C4_SPEED, CONFIG_SYS_FSL_I2C4_SLAVE,
+			 3)
+#endif