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/*
* Copyright 2008-2011 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 "ddr.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 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 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 > 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;
}
}
}
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