diff options
Diffstat (limited to 'cpu/mcf532x/speed.c')
| -rw-r--r-- | cpu/mcf532x/speed.c | 119 |
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; |