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/*
* 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)
{
/*
* If no DIMMs on this controller, do not proceed any further.
*/
if (!memctl_common_params->ndimms_present) {
return;
}
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(memctl_common_params->base_address,
memctl_common_params->total_mem,
lawbar1_target_id) < 0) {
printf("ERROR\n");
return ;
}
} else if (ctrl_num == 1) {
if (set_ddr_laws(memctl_common_params->base_address,
memctl_common_params->total_mem,
LAW_TRGT_IF_DDR_2) < 0) {
printf("ERROR\n");
return ;
}
} else {
printf("unexpected controller number %u in %s\n",
ctrl_num, __FUNCTION__);
}
}
__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);
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