diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc8xxx/ddr/util.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc8xxx/ddr/util.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/util.c b/arch/powerpc/cpu/mpc8xxx/ddr/util.c new file mode 100644 index 0000000000..1e2d921286 --- /dev/null +++ b/arch/powerpc/cpu/mpc8xxx/ddr/util.c @@ -0,0 +1,206 @@ +/* + * Copyright 2008 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * Version 2 as published by the Free Software Foundation. + */ + +#include <common.h> +#include <asm/fsl_law.h> + +#include "ddr.h" + +unsigned int fsl_ddr_get_mem_data_rate(void); + +/* + * Round mclk_ps to nearest 10 ps in memory controller code. + * + * If an imprecise data rate is too high due to rounding error + * propagation, compute a suitably rounded mclk_ps to compute + * a working memory controller configuration. + */ +unsigned int get_memory_clk_period_ps(void) +{ + unsigned int mclk_ps; + + mclk_ps = 2000000000000ULL / fsl_ddr_get_mem_data_rate(); + /* round to nearest 10 ps */ + return 10 * ((mclk_ps + 5) / 10); +} + +/* Convert picoseconds into DRAM clock cycles (rounding up if needed). */ +unsigned int picos_to_mclk(unsigned int picos) +{ + const unsigned long long ULL_2e12 = 2000000000000ULL; + const unsigned long long ULL_8Fs = 0xFFFFFFFFULL; + unsigned long long clks; + unsigned long long clks_temp; + + if (!picos) + return 0; + + clks = fsl_ddr_get_mem_data_rate() * (unsigned long long) picos; + clks_temp = clks; + clks = clks / ULL_2e12; + if (clks_temp % ULL_2e12) { + clks++; + } + + if (clks > ULL_8Fs) { + clks = ULL_8Fs; + } + + return (unsigned int) clks; +} + +unsigned int mclk_to_picos(unsigned int mclk) +{ + return get_memory_clk_period_ps() * mclk; +} + +void +__fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params, + unsigned int memctl_interleaved, + unsigned int ctrl_num) +{ + unsigned long long base = memctl_common_params->base_address; + unsigned long long size = memctl_common_params->total_mem; + + /* + * If no DIMMs on this controller, do not proceed any further. + */ + if (!memctl_common_params->ndimms_present) { + return; + } + +#if !defined(CONFIG_PHYS_64BIT) + if (base >= CONFIG_MAX_MEM_MAPPED) + return; + if ((base + size) >= CONFIG_MAX_MEM_MAPPED) + size = CONFIG_MAX_MEM_MAPPED - base; +#endif + + if (ctrl_num == 0) { + /* + * Set up LAW for DDR controller 1 space. + */ + unsigned int lawbar1_target_id = memctl_interleaved + ? LAW_TRGT_IF_DDR_INTRLV : LAW_TRGT_IF_DDR_1; + + if (set_ddr_laws(base, size, lawbar1_target_id) < 0) { + printf("%s: ERROR (ctrl #0, intrlv=%d)\n", __func__, + memctl_interleaved); + return ; + } + } else if (ctrl_num == 1) { + if (set_ddr_laws(base, size, LAW_TRGT_IF_DDR_2) < 0) { + printf("%s: ERROR (ctrl #1)\n", __func__); + return ; + } + } else { + printf("%s: unexpected DDR controller number (%u)\n", __func__, + ctrl_num); + } +} + +__attribute__((weak, alias("__fsl_ddr_set_lawbar"))) void +fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params, + unsigned int memctl_interleaved, + unsigned int ctrl_num); + +void board_add_ram_info(int use_default) +{ +#if defined(CONFIG_MPC85xx) + volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR); +#elif defined(CONFIG_MPC86xx) + volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC86xx_DDR_ADDR); +#endif +#if (CONFIG_NUM_DDR_CONTROLLERS > 1) + uint32_t cs0_config = in_be32(&ddr->cs0_config); +#endif + uint32_t sdram_cfg = in_be32(&ddr->sdram_cfg); + int cas_lat; + + puts(" (DDR"); + switch ((sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) >> + SDRAM_CFG_SDRAM_TYPE_SHIFT) { + case SDRAM_TYPE_DDR1: + puts("1"); + break; + case SDRAM_TYPE_DDR2: + puts("2"); + break; + case SDRAM_TYPE_DDR3: + puts("3"); + break; + default: + puts("?"); + break; + } + + if (sdram_cfg & SDRAM_CFG_32_BE) + puts(", 32-bit"); + else + puts(", 64-bit"); + + /* Calculate CAS latency based on timing cfg values */ + cas_lat = ((in_be32(&ddr->timing_cfg_1) >> 16) & 0xf) + 1; + if ((in_be32(&ddr->timing_cfg_3) >> 12) & 1) + cas_lat += (8 << 1); + printf(", CL=%d", cas_lat >> 1); + if (cas_lat & 0x1) + puts(".5"); + + if (sdram_cfg & SDRAM_CFG_ECC_EN) + puts(", ECC on)"); + else + puts(", ECC off)"); + +#if (CONFIG_NUM_DDR_CONTROLLERS > 1) + if (cs0_config & 0x20000000) { + puts("\n"); + puts(" DDR Controller Interleaving Mode: "); + + switch ((cs0_config >> 24) & 0xf) { + case FSL_DDR_CACHE_LINE_INTERLEAVING: + puts("cache line"); + break; + case FSL_DDR_PAGE_INTERLEAVING: + puts("page"); + break; + case FSL_DDR_BANK_INTERLEAVING: + puts("bank"); + break; + case FSL_DDR_SUPERBANK_INTERLEAVING: + puts("super-bank"); + break; + default: + puts("invalid"); + break; + } + } +#endif + + if ((sdram_cfg >> 8) & 0x7f) { + puts("\n"); + puts(" DDR Chip-Select Interleaving Mode: "); + switch(sdram_cfg >> 8 & 0x7f) { + case FSL_DDR_CS0_CS1_CS2_CS3: + puts("CS0+CS1+CS2+CS3"); + break; + case FSL_DDR_CS0_CS1: + puts("CS0+CS1"); + break; + case FSL_DDR_CS2_CS3: + puts("CS2+CS3"); + break; + case FSL_DDR_CS0_CS1_AND_CS2_CS3: + puts("CS0+CS1 and CS2+CS3"); + break; + default: + puts("invalid"); + break; + } + } +} |
