2 * Copyright 2008 Freescale Semiconductor, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * Version 2 as published by the Free Software Foundation.
10 #include <asm/fsl_law.h>
14 unsigned int fsl_ddr_get_mem_data_rate(void);
17 * Round mclk_ps to nearest 10 ps in memory controller code.
19 * If an imprecise data rate is too high due to rounding error
20 * propagation, compute a suitably rounded mclk_ps to compute
21 * a working memory controller configuration.
23 unsigned int get_memory_clk_period_ps(void)
27 mclk_ps = 2000000000000ULL / fsl_ddr_get_mem_data_rate();
28 /* round to nearest 10 ps */
29 return 10 * ((mclk_ps + 5) / 10);
32 /* Convert picoseconds into DRAM clock cycles (rounding up if needed). */
33 unsigned int picos_to_mclk(unsigned int picos)
35 const unsigned long long ULL_2e12 = 2000000000000ULL;
36 const unsigned long long ULL_8Fs = 0xFFFFFFFFULL;
37 unsigned long long clks;
38 unsigned long long clks_temp;
43 clks = fsl_ddr_get_mem_data_rate() * (unsigned long long) picos;
45 clks = clks / ULL_2e12;
46 if (clks_temp % ULL_2e12) {
54 return (unsigned int) clks;
57 unsigned int mclk_to_picos(unsigned int mclk)
59 return get_memory_clk_period_ps() * mclk;
63 __fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params,
64 unsigned int memctl_interleaved,
65 unsigned int ctrl_num)
68 * If no DIMMs on this controller, do not proceed any further.
70 if (!memctl_common_params->ndimms_present) {
76 * Set up LAW for DDR controller 1 space.
78 unsigned int lawbar1_target_id = memctl_interleaved
79 ? LAW_TRGT_IF_DDR_INTRLV : LAW_TRGT_IF_DDR_1;
81 if (set_ddr_laws(memctl_common_params->base_address,
82 memctl_common_params->total_mem,
83 lawbar1_target_id) < 0) {
87 } else if (ctrl_num == 1) {
88 if (set_ddr_laws(memctl_common_params->base_address,
89 memctl_common_params->total_mem,
90 LAW_TRGT_IF_DDR_2) < 0) {
95 printf("unexpected controller number %u in %s\n",
96 ctrl_num, __FUNCTION__);
100 __attribute__((weak, alias("__fsl_ddr_set_lawbar"))) void
101 fsl_ddr_set_lawbar(const common_timing_params_t *memctl_common_params,
102 unsigned int memctl_interleaved,
103 unsigned int ctrl_num);