Merge remote-tracking branch 'origin/master'

8 files changed, 262 insertions, 61 deletions

diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index bf64a2a..6653870 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -26,7 +26,12 @@
 #include <asm/arch/hardware.h>
 #include "designware_i2c.h"
 
-static struct i2c_regs *const i2c_regs_p =
+#ifdef CONFIG_I2C_MULTI_BUS
+static unsigned int bus_initialized[CONFIG_SYS_I2C_BUS_MAX];
+static unsigned int current_bus = 0;
+#endif
+
+static struct i2c_regs *i2c_regs_p =
     (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
 
 /*
@@ -39,7 +44,6 @@ static void set_speed(int i2c_spd)
 {
 	unsigned int cntl;
 	unsigned int hcnt, lcnt;
-	unsigned int high, low;
 	unsigned int enbl;
 
 	/* to set speed cltr must be disabled */
@@ -47,39 +51,38 @@ static void set_speed(int i2c_spd)
 	enbl &= ~IC_ENABLE_0B;
 	writel(enbl, &i2c_regs_p->ic_enable);
 
-
 	cntl = (readl(&i2c_regs_p->ic_con) & (~IC_CON_SPD_MSK));
 
 	switch (i2c_spd) {
 	case IC_SPEED_MODE_MAX:
 		cntl |= IC_CON_SPD_HS;
-		high = MIN_HS_SCL_HIGHTIME;
-		low = MIN_HS_SCL_LOWTIME;
+		hcnt = (IC_CLK * MIN_HS_SCL_HIGHTIME) / NANO_TO_MICRO;
+		writel(hcnt, &i2c_regs_p->ic_hs_scl_hcnt);
+		lcnt = (IC_CLK * MIN_HS_SCL_LOWTIME) / NANO_TO_MICRO;
+		writel(lcnt, &i2c_regs_p->ic_hs_scl_lcnt);
 		break;
 
 	case IC_SPEED_MODE_STANDARD:
 		cntl |= IC_CON_SPD_SS;
-		high = MIN_SS_SCL_HIGHTIME;
-		low = MIN_SS_SCL_LOWTIME;
+		hcnt = (IC_CLK * MIN_SS_SCL_HIGHTIME) / NANO_TO_MICRO;
+		writel(hcnt, &i2c_regs_p->ic_ss_scl_hcnt);
+		lcnt = (IC_CLK * MIN_SS_SCL_LOWTIME) / NANO_TO_MICRO;
+		writel(lcnt, &i2c_regs_p->ic_ss_scl_lcnt);
 		break;
 
 	case IC_SPEED_MODE_FAST:
 	default:
 		cntl |= IC_CON_SPD_FS;
-		high = MIN_FS_SCL_HIGHTIME;
-		low = MIN_FS_SCL_LOWTIME;
+		hcnt = (IC_CLK * MIN_FS_SCL_HIGHTIME) / NANO_TO_MICRO;
+		writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
+		lcnt = (IC_CLK * MIN_FS_SCL_LOWTIME) / NANO_TO_MICRO;
+		writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
 		break;
 	}
 
 	writel(cntl, &i2c_regs_p->ic_con);
 
-	hcnt = (IC_CLK * high) / NANO_TO_MICRO;
-	writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
-
-	lcnt = (IC_CLK * low) / NANO_TO_MICRO;
-	writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
-
-	/* re-enable i2c ctrl back now that speed is set */
+	/* Enable back i2c now speed set */
 	enbl |= IC_ENABLE_0B;
 	writel(enbl, &i2c_regs_p->ic_enable);
 }
@@ -150,6 +153,10 @@ void i2c_init(int speed, int slaveadd)
 	enbl = readl(&i2c_regs_p->ic_enable);
 	enbl |= IC_ENABLE_0B;
 	writel(enbl, &i2c_regs_p->ic_enable);
+
+#ifdef CONFIG_I2C_MULTI_BUS
+	bus_initialized[current_bus] = 1;
+#endif
 }
 
 /*
@@ -274,7 +281,10 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
 
 	start_time_rx = get_timer(0);
 	while (len) {
-		writel(IC_CMD, &i2c_regs_p->ic_cmd_data);
+		if (len == 1)
+			writel(IC_CMD | IC_STOP, &i2c_regs_p->ic_cmd_data);
+		else
+			writel(IC_CMD, &i2c_regs_p->ic_cmd_data);
 
 		if (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) {
 			*buffer++ = (uchar)readl(&i2c_regs_p->ic_cmd_data);
@@ -313,9 +323,11 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
 	start_time_tx = get_timer(0);
 	while (len) {
 		if (readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF) {
-			writel(*buffer, &i2c_regs_p->ic_cmd_data);
+			if (--len == 0)
+				writel(*buffer | IC_STOP, &i2c_regs_p->ic_cmd_data);
+			else
+				writel(*buffer, &i2c_regs_p->ic_cmd_data);
 			buffer++;
-			len--;
 			start_time_tx = get_timer(0);
 
 		} else if (get_timer(start_time_tx) > (nb * I2C_BYTE_TO)) {
@@ -344,3 +356,74 @@ int i2c_probe(uchar chip)
 
 	return ret;
 }
+
+#ifdef CONFIG_I2C_MULTI_BUS
+int i2c_set_bus_num(unsigned int bus)
+{
+	switch (bus) {
+	case 0:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE;
+		break;
+#ifdef CONFIG_SYS_I2C_BASE1
+	case 1:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE1;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE2
+	case 2:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE2;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE3
+	case 3:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE3;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE4
+	case 4:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE4;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE5
+	case 5:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE5;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE6
+	case 6:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE6;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE7
+	case 7:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE7;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE8
+	case 8:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE8;
+		break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE9
+	case 9:
+		i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE9;
+		break;
+#endif
+	default:
+		printf("Bad bus: %d\n", bus);
+		return -1;
+	}
+
+	current_bus = bus;
+
+	if (!bus_initialized[current_bus])
+		i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+
+	return 0;
+}
+
+int i2c_get_bus_num(void)
+{
+	return current_bus;
+}
+#endif
diff --git a/drivers/i2c/designware_i2c.h b/drivers/i2c/designware_i2c.h
index 03b520e..2faf4a8 100644
--- a/drivers/i2c/designware_i2c.h
+++ b/drivers/i2c/designware_i2c.h
@@ -60,14 +60,16 @@ struct i2c_regs {
 	u32 ic_tx_abrt_source;
 };
 
+#if !defined(IC_CLK)
 #define IC_CLK			166
+#endif
 #define NANO_TO_MICRO		1000
 
 /* High and low times in different speed modes (in ns) */
 #define MIN_SS_SCL_HIGHTIME	4000
-#define MIN_SS_SCL_LOWTIME	5000
-#define MIN_FS_SCL_HIGHTIME	800
-#define MIN_FS_SCL_LOWTIME	1700
+#define MIN_SS_SCL_LOWTIME	4700
+#define MIN_FS_SCL_HIGHTIME	600
+#define MIN_FS_SCL_LOWTIME	1300
 #define MIN_HS_SCL_HIGHTIME	60
 #define MIN_HS_SCL_LOWTIME	160
 
@@ -95,6 +97,7 @@ struct i2c_regs {
 
 /* i2c data buffer and command register definitions */
 #define IC_CMD			0x0100
+#define IC_STOP			0x0200
 
 /* i2c interrupt status register definitions */
 #define IC_GEN_CALL		0x0800
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 18270b9..a73b10b 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -115,7 +115,7 @@ static uint8_t i2c_imx_get_clk(unsigned int rate)
 /*
  * Set I2C Bus speed
  */
-int bus_i2c_set_bus_speed(void *base, int speed)
+static int bus_i2c_set_bus_speed(void *base, int speed)
 {
 	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
 	u8 clk_idx = i2c_imx_get_clk(speed);
@@ -133,7 +133,7 @@ int bus_i2c_set_bus_speed(void *base, int speed)
 /*
  * Get I2C Speed
  */
-unsigned int bus_i2c_get_bus_speed(void *base)
+static unsigned int bus_i2c_get_bus_speed(void *base)
 {
 	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
 	u8 clk_idx = readb(&i2c_regs->ifdr);
diff --git a/drivers/i2c/mxs_i2c.c b/drivers/i2c/mxs_i2c.c
index 2a193c2..b907f7b 100644
--- a/drivers/i2c/mxs_i2c.c
+++ b/drivers/i2c/mxs_i2c.c
@@ -28,6 +28,7 @@
 
 #include <common.h>
 #include <malloc.h>
+#include <i2c.h>
 #include <asm/errno.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
@@ -40,6 +41,7 @@ void mxs_i2c_reset(void)
 {
 	struct mxs_i2c_regs *i2c_regs = (struct mxs_i2c_regs *)MXS_I2C0_BASE;
 	int ret;
+	int speed = i2c_get_bus_speed();
 
 	ret = mxs_reset_block(&i2c_regs->hw_i2c_ctrl0_reg);
 	if (ret) {
@@ -53,6 +55,8 @@ void mxs_i2c_reset(void)
 		&i2c_regs->hw_i2c_ctrl1_clr);
 
 	writel(I2C_QUEUECTRL_PIO_QUEUE_MODE, &i2c_regs->hw_i2c_queuectrl_set);
+
+	i2c_set_bus_speed(speed);
 }
 
 void mxs_i2c_setup_read(uint8_t chip, int len)
@@ -210,37 +214,65 @@ int i2c_probe(uchar chip)
 	return ret;
 }
 
-void i2c_init(int speed, int slaveadd)
+int i2c_set_bus_speed(unsigned int speed)
 {
 	struct mxs_i2c_regs *i2c_regs = (struct mxs_i2c_regs *)MXS_I2C0_BASE;
+	/*
+	 * The timing derivation algorithm. There is no documentation for this
+	 * algorithm available, it was derived by using the scope and fiddling
+	 * with constants until the result observed on the scope was good enough
+	 * for 20kHz, 50kHz, 100kHz, 200kHz, 300kHz and 400kHz. It should be
+	 * possible to assume the algorithm works for other frequencies as well.
+	 *
+	 * Note it was necessary to cap the frequency on both ends as it's not
+	 * possible to configure completely arbitrary frequency for the I2C bus
+	 * clock.
+	 */
+	uint32_t clk = mxc_get_clock(MXC_XTAL_CLK);
+	uint32_t base = ((clk / speed) - 38) / 2;
+	uint16_t high_count = base + 3;
+	uint16_t low_count = base - 3;
+	uint16_t rcv_count = (high_count * 3) / 4;
+	uint16_t xmit_count = low_count / 4;
+
+	if (speed > 540000) {
+		printf("MXS I2C: Speed too high (%d Hz)\n", speed);
+		return -EINVAL;
+	}
 
-	mxs_i2c_reset();
-
-	switch (speed) {
-	case 100000:
-		writel((0x0078 << I2C_TIMING0_HIGH_COUNT_OFFSET) |
-			(0x0030 << I2C_TIMING0_RCV_COUNT_OFFSET),
-			&i2c_regs->hw_i2c_timing0);
-		writel((0x0080 << I2C_TIMING1_LOW_COUNT_OFFSET) |
-			(0x0030 << I2C_TIMING1_XMIT_COUNT_OFFSET),
-			&i2c_regs->hw_i2c_timing1);
-		break;
-	case 400000:
-		writel((0x000f << I2C_TIMING0_HIGH_COUNT_OFFSET) |
-			(0x0007 << I2C_TIMING0_RCV_COUNT_OFFSET),
-			&i2c_regs->hw_i2c_timing0);
-		writel((0x001f << I2C_TIMING1_LOW_COUNT_OFFSET) |
-			(0x000f << I2C_TIMING1_XMIT_COUNT_OFFSET),
-			&i2c_regs->hw_i2c_timing1);
-		break;
-	default:
-		printf("MXS I2C: Invalid speed selected (%d Hz)\n", speed);
-		return;
+	if (speed < 12000) {
+		printf("MXS I2C: Speed too low (%d Hz)\n", speed);
+		return -EINVAL;
 	}
 
-	writel((0x0015 << I2C_TIMING2_BUS_FREE_OFFSET) |
-		(0x000d << I2C_TIMING2_LEADIN_COUNT_OFFSET),
+	writel((high_count << 16) | rcv_count, &i2c_regs->hw_i2c_timing0);
+	writel((low_count << 16) | xmit_count, &i2c_regs->hw_i2c_timing1);
+
+	writel((0x0030 << I2C_TIMING2_BUS_FREE_OFFSET) |
+		(0x0030 << I2C_TIMING2_LEADIN_COUNT_OFFSET),
 		&i2c_regs->hw_i2c_timing2);
 
+	return 0;
+}
+
+unsigned int i2c_get_bus_speed(void)
+{
+	struct mxs_i2c_regs *i2c_regs = (struct mxs_i2c_regs *)MXS_I2C0_BASE;
+	uint32_t clk = mxc_get_clock(MXC_XTAL_CLK);
+	uint32_t timing0;
+
+	timing0 = readl(&i2c_regs->hw_i2c_timing0);
+	/*
+	 * This is a reverse version of the algorithm presented in
+	 * i2c_set_bus_speed(). Please refer there for details.
+	 */
+	return clk / ((((timing0 >> 16) - 3) * 2) + 38);
+}
+
+void i2c_init(int speed, int slaveadd)
+{
+	mxs_i2c_reset();
+	i2c_set_bus_speed(speed);
+
 	return;
 }
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
index 094305f..af454f9 100644
--- a/drivers/i2c/omap24xx_i2c.c
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -179,7 +179,8 @@ static int i2c_read_byte(u8 devaddr, u16 regoffset, u8 alen, u8 *value)
 		if (status & I2C_STAT_XRDY) {
 			w = tmpbuf[i++];
 #if !(defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
-	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX))
+	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+	defined(CONFIG_OMAP54XX))
 			w |= tmpbuf[i++] << 8;
 #endif
 			writew(w, &i2c_base->data);
@@ -209,7 +210,8 @@ static int i2c_read_byte(u8 devaddr, u16 regoffset, u8 alen, u8 *value)
 		}
 		if (status & I2C_STAT_RRDY) {
 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
-	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX)
+	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+	defined(CONFIG_OMAP54XX)
 			*value = readb(&i2c_base->data);
 #else
 			*value = readw(&i2c_base->data);
@@ -239,7 +241,8 @@ static void flush_fifo(void)
 		stat = readw(&i2c_base->stat);
 		if (stat == I2C_STAT_RRDY) {
 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
-	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX)
+	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+	defined(CONFIG_OMAP54XX)
 			readb(&i2c_base->data);
 #else
 			readw(&i2c_base->data);
@@ -289,7 +292,8 @@ int i2c_probe(uchar chip)
 		if (status & I2C_STAT_RRDY) {
 			res = 0;
 #if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
-    defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX)
+	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+	defined(CONFIG_OMAP54XX)
 			readb(&i2c_base->data);
 #else
 			readw(&i2c_base->data);
@@ -376,7 +380,8 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
 		if (status & I2C_STAT_XRDY) {
 			w = (i < 0) ? tmpbuf[2+i] : buffer[i];
 #if !(defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
-	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX))
+	defined(CONFIG_OMAP44XX) || defined(CONFIG_AM33XX) || \
+	defined(CONFIG_OMAP54XX))
 			w |= ((++i < 0) ? tmpbuf[2+i] : buffer[i]) << 8;
 #endif
 			writew(w, &i2c_base->data);
diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
index 9bc4c7f..90d297a 100644
--- a/drivers/i2c/s3c24x0_i2c.c
+++ b/drivers/i2c/s3c24x0_i2c.c
@@ -27,7 +27,7 @@
  */
 
 #include <common.h>
-#ifdef CONFIG_EXYNOS5
+#if (defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
 #include <asm/arch/clk.h>
 #include <asm/arch/cpu.h>
 #else
@@ -62,7 +62,7 @@
 
 static unsigned int g_current_bus;	/* Stores Current I2C Bus */
 
-#ifndef CONFIG_EXYNOS5
+#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
 static int GetI2CSDA(void)
 {
 	struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio();
@@ -121,7 +121,12 @@ static void ReadWriteByte(struct s3c24x0_i2c *i2c)
 
 static struct s3c24x0_i2c *get_base_i2c(void)
 {
-#ifdef CONFIG_EXYNOS5
+#ifdef CONFIG_EXYNOS4
+	struct s3c24x0_i2c *i2c = (struct s3c24x0_i2c *)(samsung_get_base_i2c()
+							+ (EXYNOS4_I2C_SPACING
+							* g_current_bus));
+	return i2c;
+#elif defined CONFIG_EXYNOS5
 	struct s3c24x0_i2c *i2c = (struct s3c24x0_i2c *)(samsung_get_base_i2c()
 							+ (EXYNOS5_I2C_SPACING
 							* g_current_bus));
@@ -134,7 +139,7 @@ static struct s3c24x0_i2c *get_base_i2c(void)
 static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd)
 {
 	ulong freq, pres = 16, div;
-#ifdef CONFIG_EXYNOS5
+#if (defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
 	freq = get_i2c_clk();
 #else
 	freq = get_PCLK();
@@ -188,7 +193,7 @@ unsigned int i2c_get_bus_num(void)
 void i2c_init(int speed, int slaveadd)
 {
 	struct s3c24x0_i2c *i2c;
-#ifndef CONFIG_EXYNOS5
+#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
 	struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio();
 #endif
 	int i;
@@ -204,7 +209,7 @@ void i2c_init(int speed, int slaveadd)
 		i--;
 	}
 
-#ifndef CONFIG_EXYNOS5
+#if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5)
 	if ((readl(&i2c->iicstat) & I2CSTAT_BSY) || GetI2CSDA() == 0) {
 #ifdef CONFIG_S3C2410
 		ulong old_gpecon = readl(&gpio->gpecon);
@@ -248,7 +253,7 @@ void i2c_init(int speed, int slaveadd)
 		writel(old_gpecon, &gpio->pgcon);
 #endif
 	}
-#endif /* #ifndef CONFIG_EXYNOS5 */
+#endif /* #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) */
 	i2c_ch_init(i2c, speed, slaveadd);
 }
 
diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c
index 1595c07..ae3c573 100644
--- a/drivers/i2c/soft_i2c.c
+++ b/drivers/i2c/soft_i2c.c
@@ -30,6 +30,9 @@
 #include <ioports.h>
 #include <asm/io.h>
 #endif
+#if defined(CONFIG_AVR32)
+#include <asm/arch/portmux.h>
+#endif
 #if defined(CONFIG_AT91FAMILY)
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index f5f43a6..1f8955a 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -22,6 +22,7 @@
  */
 
 #include <common.h>
+#include <environment.h>
 #include <serial.h>
 #include <stdio_dev.h>
 #include <post.h>
@@ -32,6 +33,11 @@ DECLARE_GLOBAL_DATA_PTR;
 
 static struct serial_device *serial_devices;
 static struct serial_device *serial_current;
+/*
+ * Table with supported baudrates (defined in config_xyz.h)
+ */
+static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
+#define	N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
 
 /**
  * serial_null() - Void registration routine of a serial driver
@@ -46,6 +52,70 @@ static void serial_null(void)
 }
 
 /**
+ * on_baudrate() - Update the actual baudrate when the env var changes
+ *
+ * This will check for a valid baudrate and only apply it if valid.
+ */
+static int on_baudrate(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	int i;
+	int baudrate;
+
+	switch (op) {
+	case env_op_create:
+	case env_op_overwrite:
+		/*
+		 * Switch to new baudrate if new baudrate is supported
+		 */
+		baudrate = simple_strtoul(value, NULL, 10);
+
+		/* Not actually changing */
+		if (gd->baudrate == baudrate)
+			return 0;
+
+		for (i = 0; i < N_BAUDRATES; ++i) {
+			if (baudrate == baudrate_table[i])
+				break;
+		}
+		if (i == N_BAUDRATES) {
+			if ((flags & H_FORCE) == 0)
+				printf("## Baudrate %d bps not supported\n",
+					baudrate);
+			return 1;
+		}
+		if ((flags & H_INTERACTIVE) != 0) {
+			printf("## Switch baudrate to %d"
+				" bps and press ENTER ...\n", baudrate);
+			udelay(50000);
+		}
+
+		gd->baudrate = baudrate;
+#if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
+		gd->bd->bi_baudrate = baudrate;
+#endif
+
+		serial_setbrg();
+
+		udelay(50000);
+
+		if ((flags & H_INTERACTIVE) != 0)
+			while (1) {
+				if (getc() == '\r')
+					break;
+			}
+
+		return 0;
+	case env_op_delete:
+		printf("## Baudrate may not be deleted\n");
+		return 1;
+	default:
+		return 0;
+	}
+}
+U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
+
+/**
  * serial_initfunc() - Forward declare of driver registration routine
  * @name:	Name of the real driver registration routine.
  *