diff options
Diffstat (limited to 'drivers/ddr/fsl/util.c')
| -rw-r--r-- | drivers/ddr/fsl/util.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/drivers/ddr/fsl/util.c b/drivers/ddr/fsl/util.c new file mode 100644 index 0000000..45a7bcc --- /dev/null +++ b/drivers/ddr/fsl/util.c @@ -0,0 +1,265 @@ +/* + * Copyright 2008-2012 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 <div64.h> + +#include <fsl_ddr.h> +#include <asm/io.h> + +/* To avoid 64-bit full-divides, we factor this here */ +#define ULL_2E12 2000000000000ULL +#define UL_5POW12 244140625UL +#define UL_2POW13 (1UL << 13) + +#define ULL_8FS 0xFFFFFFFFULL + +/* + * Round up mclk_ps to nearest 1 ps in memory controller code + * if the error is 0.5ps or more. + * + * 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 data_rate = get_ddr_freq(0); + unsigned int result; + + /* Round to nearest 10ps, being careful about 64-bit multiply/divide */ + unsigned long long rem, mclk_ps = ULL_2E12; + + /* Now perform the big divide, the result fits in 32-bits */ + rem = do_div(mclk_ps, data_rate); + result = (rem >= (data_rate >> 1)) ? mclk_ps + 1 : mclk_ps; + + return result; +} + +/* Convert picoseconds into DRAM clock cycles (rounding up if needed). */ +unsigned int picos_to_mclk(unsigned int picos) +{ + unsigned long long clks, clks_rem; + unsigned long data_rate = get_ddr_freq(0); + + /* Short circuit for zero picos */ + if (!picos) + return 0; + + /* First multiply the time by the data rate (32x32 => 64) */ + clks = picos * (unsigned long long)data_rate; + /* + * Now divide by 5^12 and track the 32-bit remainder, then divide + * by 2*(2^12) using shifts (and updating the remainder). + */ + clks_rem = do_div(clks, UL_5POW12); + clks_rem += (clks & (UL_2POW13-1)) * UL_5POW12; + clks >>= 13; + + /* If we had a remainder greater than the 1ps error, then round up */ + if (clks_rem > data_rate) + clks++; + + /* Clamp to the maximum representable value */ + 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 law_memctl, + 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 (set_ddr_laws(base, size, law_memctl) < 0) { + printf("%s: ERROR (ctrl #%d, TRGT ID=%x)\n", __func__, ctrl_num, + law_memctl); + return ; + } + debug("setup ddr law base = 0x%llx, size 0x%llx, TRGT_ID 0x%x\n", + base, size, law_memctl); +} + +__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 fsl_ddr_set_intl3r(const unsigned int granule_size) +{ +#ifdef CONFIG_E6500 + u32 *mcintl3r = (void *) (CONFIG_SYS_IMMR + 0x18004); + *mcintl3r = 0x80000000 | (granule_size & 0x1f); + debug("Enable MCINTL3R with granule size 0x%x\n", granule_size); +#endif +} + +u32 fsl_ddr_get_intl3r(void) +{ + u32 val = 0; +#ifdef CONFIG_E6500 + u32 *mcintl3r = (void *) (CONFIG_SYS_IMMR + 0x18004); + val = *mcintl3r; +#endif + return val; +} + +void board_add_ram_info(int use_default) +{ + ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_FSL_DDR_ADDR); + +#if defined(CONFIG_E6500) && (CONFIG_NUM_DDR_CONTROLLERS == 3) + u32 *mcintl3r = (void *) (CONFIG_SYS_IMMR + 0x18004); +#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; + +#if CONFIG_NUM_DDR_CONTROLLERS >= 2 + if (!(sdram_cfg & SDRAM_CFG_MEM_EN)) { + ddr = (void __iomem *)CONFIG_SYS_FSL_DDR2_ADDR; + sdram_cfg = in_be32(&ddr->sdram_cfg); + } +#endif +#if CONFIG_NUM_DDR_CONTROLLERS >= 3 + if (!(sdram_cfg & SDRAM_CFG_MEM_EN)) { + ddr = (void __iomem *)CONFIG_SYS_FSL_DDR3_ADDR; + sdram_cfg = in_be32(&ddr->sdram_cfg); + } +#endif + 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 if (sdram_cfg & SDRAM_CFG_16_BE) + puts(", 16-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 == 3) +#ifdef CONFIG_E6500 + if (*mcintl3r & 0x80000000) { + puts("\n"); + puts(" DDR Controller Interleaving Mode: "); + switch (*mcintl3r & 0x1f) { + case FSL_DDR_3WAY_1KB_INTERLEAVING: + puts("3-way 1KB"); + break; + case FSL_DDR_3WAY_4KB_INTERLEAVING: + puts("3-way 4KB"); + break; + case FSL_DDR_3WAY_8KB_INTERLEAVING: + puts("3-way 8KB"); + break; + default: + puts("3-way UNKNOWN"); + break; + } + } +#endif +#endif +#if (CONFIG_NUM_DDR_CONTROLLERS >= 2) + 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; + } + } +} |