ColdFire: Add MCF5301x CPU and M53017EVB support

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

1 files changed, 85 insertions, 34 deletions

diff --git a/cpu/mcf532x/speed.c b/cpu/mcf532x/speed.c
index 1e40374..0d378e6 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;