ColdFire: Add MCF5301x CPU and M53017EVB support

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>

4 files changed, 304 insertions, 49 deletions

diff --git a/cpu/mcf532x/cpu.c b/cpu/mcf532x/cpu.c
index fd77939f2..bcb092de0 100644
--- a/cpu/mcf532x/cpu.c
+++ b/cpu/mcf532x/cpu.c
@@ -3,7 +3,7 @@
  * (C) Copyright 2000-2003
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
- * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
  *
  * See file CREDITS for list of people who contributed to this
@@ -56,6 +56,24 @@ int checkcpu(void)
 	msk = (ccm->cir >> 6);
 	ver = (ccm->cir & 0x003f);
 	switch (msk) {
+#ifdef CONFIG_MCF5301x
+	case 0x78:
+		id = 53010;
+		break;
+	case 0x77:
+		id = 53012;
+		break;
+	case 0x76:
+		id = 53015;
+		break;
+	case 0x74:
+		id = 53011;
+		break;
+	case 0x73:
+		id = 53013;
+		break;
+#endif
+#ifdef CONFIG_MCF532x
 	case 0x54:
 		id = 5329;
 		break;
@@ -77,6 +95,7 @@ int checkcpu(void)
 	case 0x6B:
 		id = 5372;
 		break;
+#endif
 	}
 
 	if (id) {
diff --git a/cpu/mcf532x/cpu_init.c b/cpu/mcf532x/cpu_init.c
index 39be11f09..687c7e42e 100644
--- a/cpu/mcf532x/cpu_init.c
+++ b/cpu/mcf532x/cpu_init.c
@@ -3,7 +3,7 @@
  * (C) Copyright 2000-2003
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
- * (C) Copyright 2007 Freescale Semiconductor, Inc.
+ * (C) Copyright 2004-2008 Freescale Semiconductor, Inc.
  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
  *
  * See file CREDITS for list of people who contributed to this
@@ -35,13 +35,180 @@
 #include <asm/fec.h>
 #endif
 
-/*
- * Breath some life into the CPU...
- *
- * Set up the memory map,
- * initialize a bunch of registers,
- * initialize the UPM's
- */
+#ifdef CONFIG_MCF5301x
+void cpu_init_f(void)
+{
+	volatile scm1_t *scm1 = (scm1_t *) MMAP_SCM1;
+	volatile scm2_t *scm2 = (scm2_t *) MMAP_SCM2;
+	volatile gpio_t *gpio = (gpio_t *) MMAP_GPIO;
+	volatile fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS;
+
+	/* watchdog is enabled by default - disable the watchdog */
+#ifndef CONFIG_WATCHDOG
+	/*wdog->cr = 0; */
+#endif
+
+	scm1->mpr = 0x77777777;
+	scm1->pacra = 0;
+	scm1->pacrb = 0;
+	scm1->pacrc = 0;
+	scm1->pacrd = 0;
+	scm1->pacre = 0;
+	scm1->pacrf = 0;
+	scm1->pacrg = 0;
+
+#if (defined(CONFIG_SYS_CS0_BASE) && defined(CONFIG_SYS_CS0_MASK) \
+     && defined(CONFIG_SYS_CS0_CTRL))
+	gpio->par_cs |= GPIO_PAR_CS0_CS0;
+	fbcs->csar0 = CONFIG_SYS_CS0_BASE;
+	fbcs->cscr0 = CONFIG_SYS_CS0_CTRL;
+	fbcs->csmr0 = CONFIG_SYS_CS0_MASK;
+#endif
+
+#if (defined(CONFIG_SYS_CS1_BASE) && defined(CONFIG_SYS_CS1_MASK) \
+     && defined(CONFIG_SYS_CS1_CTRL))
+	gpio->par_cs |= GPIO_PAR_CS1_CS1;
+	fbcs->csar1 = CONFIG_SYS_CS1_BASE;
+	fbcs->cscr1 = CONFIG_SYS_CS1_CTRL;
+	fbcs->csmr1 = CONFIG_SYS_CS1_MASK;
+#endif
+
+#if (defined(CONFIG_SYS_CS2_BASE) && defined(CONFIG_SYS_CS2_MASK) \
+     && defined(CONFIG_SYS_CS2_CTRL))
+	fbcs->csar2 = CONFIG_SYS_CS2_BASE;
+	fbcs->cscr2 = CONFIG_SYS_CS2_CTRL;
+	fbcs->csmr2 = CONFIG_SYS_CS2_MASK;
+#endif
+
+#if (defined(CONFIG_SYS_CS3_BASE) && defined(CONFIG_SYS_CS3_MASK) \
+     && defined(CONFIG_SYS_CS3_CTRL))
+	fbcs->csar3 = CONFIG_SYS_CS3_BASE;
+	fbcs->cscr3 = CONFIG_SYS_CS3_CTRL;
+	fbcs->csmr3 = CONFIG_SYS_CS3_MASK;
+#endif
+
+#if (defined(CONFIG_SYS_CS4_BASE) && defined(CONFIG_SYS_CS4_MASK) \
+     && defined(CONFIG_SYS_CS4_CTRL))
+	gpio->par_cs |= GPIO_PAR_CS4;
+	fbcs->csar4 = CONFIG_SYS_CS4_BASE;
+	fbcs->cscr4 = CONFIG_SYS_CS4_CTRL;
+	fbcs->csmr4 = CONFIG_SYS_CS4_MASK;
+#endif
+
+#if (defined(CONFIG_SYS_CS5_BASE) && defined(CONFIG_SYS_CS5_MASK) \
+     && defined(CONFIG_SYS_CS5_CTRL))
+	gpio->par_cs |= GPIO_PAR_CS5;
+	fbcs->csar5 = CONFIG_SYS_CS5_BASE;
+	fbcs->cscr5 = CONFIG_SYS_CS5_CTRL;
+	fbcs->csmr5 = CONFIG_SYS_CS5_MASK;
+#endif
+
+#ifdef CONFIG_FSL_I2C
+	gpio->par_feci2c = GPIO_PAR_FECI2C_SDA_SDA | GPIO_PAR_FECI2C_SCL_SCL;
+#endif
+
+	icache_enable();
+}
+
+/* initialize higher level parts of CPU like timers */
+int cpu_init_r(void)
+{
+#ifdef CONFIG_MCFFEC
+	volatile ccm_t *ccm = (ccm_t *) MMAP_CCM;
+#endif
+#ifdef CONFIG_MCFRTC
+	volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
+	volatile rtcex_t *rtcex = (rtcex_t *) & rtc->extended;
+
+	rtcex->gocu = CONFIG_SYS_RTC_CNT;
+	rtcex->gocl = CONFIG_SYS_RTC_SETUP;
+
+#endif
+#ifdef CONFIG_MCFFEC
+	if (CONFIG_SYS_FEC0_MIIBASE != CONFIG_SYS_FEC1_MIIBASE)
+		ccm->misccr |= CCM_MISCCR_FECM;
+	else
+		ccm->misccr &= ~CCM_MISCCR_FECM;
+#endif
+
+	return (0);
+}
+
+void uart_port_conf(void)
+{
+	volatile gpio_t *gpio = (gpio_t *) MMAP_GPIO;
+
+	/* Setup Ports: */
+	switch (CONFIG_SYS_UART_PORT) {
+	case 0:
+		gpio->par_uart = (GPIO_PAR_UART_U0TXD | GPIO_PAR_UART_U0RXD);
+		break;
+	case 1:
+#ifdef CONFIG_SYS_UART1_ALT1_GPIO
+		gpio->par_simp1h &=
+		    ~(GPIO_PAR_SIMP1H_DATA1_MASK | GPIO_PAR_SIMP1H_VEN1_MASK);
+		gpio->par_simp1h |=
+		    (GPIO_PAR_SIMP1H_DATA1_U1TXD | GPIO_PAR_SIMP1H_VEN1_U1RXD);
+#elif defined(CONFIG_SYS_UART1_ALT2_GPIO)
+		gpio->par_ssih &=
+		    ~(GPIO_PAR_SSIH_RXD_MASK | GPIO_PAR_SSIH_TXD_MASK);
+		gpio->par_ssih |=
+		    (GPIO_PAR_SSIH_RXD_U1RXD | GPIO_PAR_SSIH_TXD_U1TXD);
+#endif
+		break;
+	case 2:
+#ifdef CONFIG_SYS_UART2_PRI_GPIO
+		gpio->par_uart |= (GPIO_PAR_UART_U2TXD | GPIO_PAR_UART_U2RXD);
+#elif defined(CONFIG_SYS_UART2_ALT1_GPIO)
+		gpio->par_dspih &=
+		    ~(GPIO_PAR_DSPIH_SIN_MASK | GPIO_PAR_DSPIH_SOUT_MASK);
+		gpio->par_dspih |=
+		    (GPIO_PAR_DSPIH_SIN_U2RXD | GPIO_PAR_DSPIH_SOUT_U2TXD);
+#elif defined(CONFIG_SYS_UART2_ALT2_GPIO)
+		gpio->par_feci2c &=
+		    ~(GPIO_PAR_FECI2C_SDA_MASK | GPIO_PAR_FECI2C_SCL_MASK);
+		gpio->par_feci2c |=
+		    (GPIO_PAR_FECI2C_SDA_U2TXD | GPIO_PAR_FECI2C_SCL_U2RXD);
+#endif
+		break;
+	}
+}
+
+#if defined(CONFIG_CMD_NET)
+int fecpin_setclear(struct eth_device *dev, int setclear)
+{
+	volatile gpio_t *gpio = (gpio_t *) MMAP_GPIO;
+	struct fec_info_s *info = (struct fec_info_s *)dev->priv;
+
+	if (setclear) {
+		if (info->iobase == CONFIG_SYS_FEC0_IOBASE) {
+			gpio->par_fec |=
+			    GPIO_PAR_FEC0_7W_FEC | GPIO_PAR_FEC0_RMII_FEC;
+			gpio->par_feci2c |=
+			    GPIO_PAR_FECI2C_MDC0 | GPIO_PAR_FECI2C_MDIO0;
+		} else {
+			gpio->par_fec |=
+			    GPIO_PAR_FEC1_7W_FEC | GPIO_PAR_FEC1_RMII_FEC;
+			gpio->par_feci2c |=
+			    GPIO_PAR_FECI2C_MDC1 | GPIO_PAR_FECI2C_MDIO1;
+		}
+	} else {
+		if (info->iobase == CONFIG_SYS_FEC0_IOBASE) {
+			gpio->par_fec &=
+			    ~(GPIO_PAR_FEC0_7W_FEC | GPIO_PAR_FEC0_RMII_FEC);
+			gpio->par_feci2c &= GPIO_PAR_FECI2C_RMII0_MASK;
+		} else {
+			gpio->par_fec &=
+			    ~(GPIO_PAR_FEC1_7W_FEC | GPIO_PAR_FEC1_RMII_FEC);
+			gpio->par_feci2c &= GPIO_PAR_FECI2C_RMII1_MASK;
+		}
+	}
+	return 0;
+}
+#endif				/* CONFIG_CMD_NET */
+#endif				/* CONFIG_MCF5301x */
+
+#ifdef CONFIG_MCF532x
 void cpu_init_f(void)
 {
 	volatile scm1_t *scm1 = (scm1_t *) MMAP_SCM1;
@@ -68,13 +235,15 @@ void cpu_init_f(void)
 	/* Port configuration */
 	gpio->par_cs = 0;
 
-#if (defined(CONFIG_SYS_CS0_BASE) && defined(CONFIG_SYS_CS0_MASK) && defined(CONFIG_SYS_CS0_CTRL))
+#if (defined(CONFIG_SYS_CS0_BASE) && defined(CONFIG_SYS_CS0_MASK) \
+     && defined(CONFIG_SYS_CS0_CTRL))
 	fbcs->csar0 = CONFIG_SYS_CS0_BASE;
 	fbcs->cscr0 = CONFIG_SYS_CS0_CTRL;
 	fbcs->csmr0 = CONFIG_SYS_CS0_MASK;
 #endif
 
-#if (defined(CONFIG_SYS_CS1_BASE) && defined(CONFIG_SYS_CS1_MASK) && defined(CONFIG_SYS_CS1_CTRL))
+#if (defined(CONFIG_SYS_CS1_BASE) && defined(CONFIG_SYS_CS1_MASK) \
+     && defined(CONFIG_SYS_CS1_CTRL))
 	/* Latch chipselect */
 	gpio->par_cs |= GPIO_PAR_CS1;
 	fbcs->csar1 = CONFIG_SYS_CS1_BASE;
@@ -82,28 +251,32 @@ void cpu_init_f(void)
 	fbcs->csmr1 = CONFIG_SYS_CS1_MASK;
 #endif
 
-#if (defined(CONFIG_SYS_CS2_BASE) && defined(CONFIG_SYS_CS2_MASK) && defined(CONFIG_SYS_CS2_CTRL))
+#if (defined(CONFIG_SYS_CS2_BASE) && defined(CONFIG_SYS_CS2_MASK) \
+     && defined(CONFIG_SYS_CS2_CTRL))
 	gpio->par_cs |= GPIO_PAR_CS2;
 	fbcs->csar2 = CONFIG_SYS_CS2_BASE;
 	fbcs->cscr2 = CONFIG_SYS_CS2_CTRL;
 	fbcs->csmr2 = CONFIG_SYS_CS2_MASK;
 #endif
 
-#if (defined(CONFIG_SYS_CS3_BASE) && defined(CONFIG_SYS_CS3_MASK) && defined(CONFIG_SYS_CS3_CTRL))
+#if (defined(CONFIG_SYS_CS3_BASE) && defined(CONFIG_SYS_CS3_MASK) \
+     && defined(CONFIG_SYS_CS3_CTRL))
 	gpio->par_cs |= GPIO_PAR_CS3;
 	fbcs->csar3 = CONFIG_SYS_CS3_BASE;
 	fbcs->cscr3 = CONFIG_SYS_CS3_CTRL;
 	fbcs->csmr3 = CONFIG_SYS_CS3_MASK;
 #endif
 
-#if (defined(CONFIG_SYS_CS4_BASE) && defined(CONFIG_SYS_CS4_MASK) && defined(CONFIG_SYS_CS4_CTRL))
+#if (defined(CONFIG_SYS_CS4_BASE) && defined(CONFIG_SYS_CS4_MASK) \
+     && defined(CONFIG_SYS_CS4_CTRL))
 	gpio->par_cs |= GPIO_PAR_CS4;
 	fbcs->csar4 = CONFIG_SYS_CS4_BASE;
 	fbcs->cscr4 = CONFIG_SYS_CS4_CTRL;
 	fbcs->csmr4 = CONFIG_SYS_CS4_MASK;
 #endif
 
-#if (defined(CONFIG_SYS_CS5_BASE) && defined(CONFIG_SYS_CS5_MASK) && defined(CONFIG_SYS_CS5_CTRL))
+#if (defined(CONFIG_SYS_CS5_BASE) && defined(CONFIG_SYS_CS5_MASK) \
+     && defined(CONFIG_SYS_CS5_CTRL))
 	gpio->par_cs |= GPIO_PAR_CS5;
 	fbcs->csar5 = CONFIG_SYS_CS5_BASE;
 	fbcs->cscr5 = CONFIG_SYS_CS5_CTRL;
@@ -162,3 +335,4 @@ int fecpin_setclear(struct eth_device *dev, int setclear)
 	return 0;
 }
 #endif
+#endif				/* CONFIG_MCF532x */
diff --git a/cpu/mcf532x/speed.c b/cpu/mcf532x/speed.c
index 1e40374d0..0d378e63d 100644
--- a/cpu/mcf532x/speed.c
+++ b/cpu/mcf532x/speed.c
@@ -3,7 +3,7 @@
  * (C) Copyright 2000-2003
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
- * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
  *
  * See file CREDITS for list of people who contributed to this
@@ -36,26 +36,33 @@ DECLARE_GLOBAL_DATA_PTR;
 #define MAX_FVCO	500000	/* KHz */
 #define MAX_FSYS	80000	/* KHz */
 #define MIN_FSYS	58333	/* KHz */
+
+#ifdef CONFIG_MCF5301x
+#define FREF		20000	/* KHz */
+#define MAX_MFD		63	/* Multiplier */
+#define MIN_MFD		0	/* Multiplier */
+#define USBDIV		8
+
+/* Low Power Divider specifications */
+#define MIN_LPD		(0)	/* Divider (not encoded) */
+#define MAX_LPD		(15)	/* Divider (not encoded) */
+#define DEFAULT_LPD	(0)	/* Divider (not encoded) */
+#endif
+
+#ifdef CONFIG_MCF532x
 #define FREF		16000	/* KHz */
 #define MAX_MFD		135	/* Multiplier */
 #define MIN_MFD		88	/* Multiplier */
-#define BUSDIV		6	/* Divider */
-/*
- * Low Power Divider specifications
- */
+
+/* Low Power Divider specifications */
 #define MIN_LPD		(1 << 0)	/* Divider (not encoded) */
 #define MAX_LPD		(1 << 15)	/* Divider (not encoded) */
 #define DEFAULT_LPD	(1 << 1)	/* Divider (not encoded) */
+#endif
 
-/*
- * Get the value of the current system clock
- *
- * Parameters:
- *  none
- *
- * Return Value:
- *  The current output system frequency
- */
+#define BUSDIV		6	/* Divider */
+
+/* Get the value of the current system clock */
 int get_sys_clock(void)
 {
 	volatile ccm_t *ccm = (volatile ccm_t *)(MMAP_CCM);
@@ -65,9 +72,23 @@ int get_sys_clock(void)
 	/* Test to see if device is in LIMP mode */
 	if (ccm->misccr & CCM_MISCCR_LIMP) {
 		divider = ccm->cdr & CCM_CDR_LPDIV(0xF);
+#ifdef CONFIG_MCF5301x
+		return (FREF / (3 * (1 << divider)));
+#endif
+#ifdef CONFIG_MCF532x
 		return (FREF / (2 << divider));
+#endif
 	} else {
+#ifdef CONFIG_MCF5301x
+		u32 pfdr = (pll->pcr & 0x3F) + 1;
+		u32 refdiv = (1 << ((pll->pcr & PLL_PCR_REFDIV(7)) >> 8));
+		u32 busdiv = ((pll->pdr & 0x00F0) >> 4) + 1;
+
+		return (((FREF * pfdr) / refdiv) / busdiv);
+#endif
+#ifdef CONFIG_MCF532x
 		return ((FREF * pll->pfdr) / (BUSDIV * 4));
+#endif
 	}
 }
 
@@ -92,7 +113,7 @@ int clock_limp(int div)
 		div = MAX_LPD;
 
 	/* Save of the current value of the SSIDIV so we don't overwrite the value */
-	temp = (ccm->cdr & CCM_CDR_SSIDIV(0xF));
+	temp = (ccm->cdr & CCM_CDR_SSIDIV(0xFF));
 
 	/* Apply the divider to the system clock */
 	ccm->cdr = (CCM_CDR_LPDIV(div) | CCM_CDR_SSIDIV(temp));
@@ -102,15 +123,7 @@ int clock_limp(int div)
 	return (FREF / (3 * (1 << div)));
 }
 
-/*
- * Exit low power LIMP mode
- *
- * Parameters:
- *  div     Desired system frequency divider
- *
- * Return Value:
- *  The resulting output system frequency
- */
+/* Exit low power LIMP mode */
 int clock_exit_limp(void)
 {
 	volatile ccm_t *ccm = (volatile ccm_t *)(MMAP_CCM);
@@ -139,7 +152,10 @@ int clock_exit_limp(void)
  */
 int clock_pll(int fsys, int flags)
 {
+#ifdef CONFIG_MCF532x
 	volatile u32 *sdram_workaround = (volatile u32 *)(MMAP_SDRAM + 0x80);
+#endif
+	volatile sdram_t *sdram = (volatile sdram_t *)(MMAP_SDRAM);
 	volatile pll_t *pll = (volatile pll_t *)(MMAP_PLL);
 	int fref, temp, fout, mfd;
 	u32 i;
@@ -148,9 +164,17 @@ int clock_pll(int fsys, int flags)
 
 	if (fsys == 0) {
 		/* Return current PLL output */
+#ifdef CONFIG_MCF5301x
+		u32 busdiv = ((pll->pdr >> 4) & 0x0F) + 1;
+		mfd = (pll->pcr & 0x3F) + 1;
+
+		return (fref * mfd) / busdiv;
+#endif
+#ifdef CONFIG_MCF532x
 		mfd = pll->pfdr;
 
 		return (fref * mfd / (BUSDIV * 4));
+#endif
 	}
 
 	/* Check bounds of requested system clock */
@@ -160,21 +184,33 @@ int clock_pll(int fsys, int flags)
 	if (fsys < MIN_FSYS)
 		fsys = MIN_FSYS;
 
-	/* Multiplying by 100 when calculating the temp value,
-	   and then dividing by 100 to calculate the mfd allows
-	   for exact values without needing to include floating
-	   point libraries. */
+	/*
+	 * Multiplying by 100 when calculating the temp value,
+	 * and then dividing by 100 to calculate the mfd allows
+	 * for exact values without needing to include floating
+	 * point libraries.
+	 */
 	temp = (100 * fsys) / fref;
+#ifdef CONFIG_MCF5301x
+	mfd = (BUSDIV * temp) / 100;
+
+	/* Determine the output frequency for selected values */
+	fout = ((fref * mfd) / BUSDIV);
+#endif
+#ifdef CONFIG_MCF532x
 	mfd = (4 * BUSDIV * temp) / 100;
 
 	/* Determine the output frequency for selected values */
 	fout = ((fref * mfd) / (BUSDIV * 4));
+#endif
 
 	/*
 	 * Check to see if the SDRAM has already been initialized.
 	 * If it has then the SDRAM needs to be put into self refresh
 	 * mode before reprogramming the PLL.
 	 */
+	if (sdram->ctrl & SDRAMC_SDCR_REF)
+		sdram->ctrl &= ~SDRAMC_SDCR_CKE;
 
 	/*
 	 * Initialize the PLL to generate the new system clock frequency.
@@ -184,20 +220,37 @@ int clock_pll(int fsys, int flags)
 	/* Enter LIMP mode */
 	clock_limp(DEFAULT_LPD);
 
+#ifdef CONFIG_MCF5301x
+	pll->pdr =
+	    PLL_PDR_OUTDIV1((BUSDIV / 3) - 1)	|
+	    PLL_PDR_OUTDIV2(BUSDIV - 1)	|
+	    PLL_PDR_OUTDIV3((BUSDIV / 2) - 1)	|
+	    PLL_PDR_OUTDIV4(USBDIV - 1);
+
+	pll->pcr &= PLL_PCR_FBDIV_MASK;
+	pll->pcr |= PLL_PCR_FBDIV(mfd - 1);
+#endif
+#ifdef CONFIG_MCF532x
 	/* Reprogram PLL for desired fsys */
 	pll->podr = (PLL_PODR_CPUDIV(BUSDIV / 3) | PLL_PODR_BUSDIV(BUSDIV));
 
 	pll->pfdr = mfd;
+#endif
 
 	/* Exit LIMP mode */
 	clock_exit_limp();
 
+	/* Return the SDRAM to normal operation if it is in use. */
+	if (sdram->ctrl & SDRAMC_SDCR_REF)
+		sdram->ctrl |= SDRAMC_SDCR_CKE;
+
+#ifdef CONFIG_MCF532x
 	/*
-	 * Return the SDRAM to normal operation if it is in use.
+	 * software workaround for SDRAM opeartion after exiting LIMP
+	 * mode errata
 	 */
-
-	/* software workaround for SDRAM opeartion after exiting LIMP mode errata */
 	*sdram_workaround = CONFIG_SYS_SDRAM_BASE;
+#endif
 
 	/* wait for DQS logic to relock */
 	for (i = 0; i < 0x200; i++) ;
@@ -205,9 +258,7 @@ int clock_pll(int fsys, int flags)
 	return fout;
 }
 
-/*
- * get_clocks() fills in gd->cpu_clock and gd->bus_clk
- */
+/* get_clocks() fills in gd->cpu_clock and gd->bus_clk */
 int get_clocks(void)
 {
 	gd->bus_clk = clock_pll(CONFIG_SYS_CLK / 1000, 0) * 1000;
diff --git a/cpu/mcf532x/start.S b/cpu/mcf532x/start.S
index 7a3eb5f98..8fa605a64 100644
--- a/cpu/mcf532x/start.S
+++ b/cpu/mcf532x/start.S
@@ -2,6 +2,9 @@
  * Copyright (C) 2003	Josef Baumgartner <josef.baumgartner@telex.de>
  * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
  *
+ * (C) Copyright 2004-2008 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -140,6 +143,14 @@ _start:
 	movec	%d0, %ACR0
 	movec	%d0, %ACR1
 
+#ifdef CONFIG_MCF5301x
+	move.l	#(0xFC0a0010), %a0
+	move.w	(%a0), %d0
+	and.l	%d0, 0xEFFF
+
+	move.w	%d0, (%a0)
+#endif
+
 	/* initialize general use internal ram */
 	move.l #0, %d0
 	move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1