* (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
#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);
/* 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
}
}
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));
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);
*/
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;
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 */
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.
/* 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 = CFG_SDRAM_BASE;
+ *sdram_workaround = CONFIG_SYS_SDRAM_BASE;
+#endif
/* wait for DQS logic to relock */
for (i = 0; i < 0x200; i++) ;
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(CFG_CLK / 1000, 0) * 1000;
+ gd->bus_clk = clock_pll(CONFIG_SYS_CLK / 1000, 0) * 1000;
gd->cpu_clk = (gd->bus_clk * 3);
+
+#ifdef CONFIG_FSL_I2C
+ gd->i2c1_clk = gd->bus_clk;
+#endif
+
return (0);
}
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