+++ /dev/null
-/*
- * SDRC register values for Nokia boards
- *
- * Copyright (C) 2008, 2010-2011 Nokia Corporation
- *
- * Lauri Leukkunen <lauri.leukkunen@nokia.com>
- *
- * Original code by Juha Yrjola <juha.yrjola@solidboot.com>
- *
- * 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 <linux/kernel.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/io.h>
-
-#include "common.h"
-#include "sdram-nokia.h"
-#include "sdrc.h"
-
-/* In picoseconds, except for tREF (ns), tXP, tCKE, tWTR (clks) */
-struct sdram_timings {
- u32 casl;
- u32 tDAL;
- u32 tDPL;
- u32 tRRD;
- u32 tRCD;
- u32 tRP;
- u32 tRAS;
- u32 tRC;
- u32 tRFC;
- u32 tXSR;
-
- u32 tREF; /* in ns */
-
- u32 tXP;
- u32 tCKE;
- u32 tWTR;
-};
-
-static const struct sdram_timings nokia_97dot6mhz_timings[] = {
- {
- .casl = 3,
- .tDAL = 30725,
- .tDPL = 15362,
- .tRRD = 10241,
- .tRCD = 20483,
- .tRP = 15362,
- .tRAS = 40967,
- .tRC = 56330,
- .tRFC = 138266,
- .tXSR = 204839,
-
- .tREF = 7798,
-
- .tXP = 2,
- .tCKE = 4,
- .tWTR = 2,
- },
-};
-
-static const struct sdram_timings nokia_166mhz_timings[] = {
- {
- .casl = 3,
- .tDAL = 33000,
- .tDPL = 15000,
- .tRRD = 12000,
- .tRCD = 22500,
- .tRP = 18000,
- .tRAS = 42000,
- .tRC = 66000,
- .tRFC = 138000,
- .tXSR = 200000,
-
- .tREF = 7800,
-
- .tXP = 2,
- .tCKE = 2,
- .tWTR = 2
- },
-};
-
-static const struct sdram_timings nokia_195dot2mhz_timings[] = {
- {
- .casl = 3,
- .tDAL = 30725,
- .tDPL = 15362,
- .tRRD = 10241,
- .tRCD = 20483,
- .tRP = 15362,
- .tRAS = 40967,
- .tRC = 56330,
- .tRFC = 138266,
- .tXSR = 204839,
-
- .tREF = 7752,
-
- .tXP = 2,
- .tCKE = 4,
- .tWTR = 2,
- },
-};
-
-static const struct sdram_timings nokia_200mhz_timings[] = {
- {
- .casl = 3,
- .tDAL = 30000,
- .tDPL = 15000,
- .tRRD = 10000,
- .tRCD = 20000,
- .tRP = 15000,
- .tRAS = 40000,
- .tRC = 55000,
- .tRFC = 140000,
- .tXSR = 200000,
-
- .tREF = 7800,
-
- .tXP = 2,
- .tCKE = 4,
- .tWTR = 2
- },
-};
-
-static const struct {
- long rate;
- struct sdram_timings const *data;
-} nokia_timings[] = {
- { 83000000, nokia_166mhz_timings },
- { 97600000, nokia_97dot6mhz_timings },
- { 100000000, nokia_200mhz_timings },
- { 166000000, nokia_166mhz_timings },
- { 195200000, nokia_195dot2mhz_timings },
- { 200000000, nokia_200mhz_timings },
-};
-static struct omap_sdrc_params nokia_sdrc_params[ARRAY_SIZE(nokia_timings) + 1];
-
-static unsigned long sdrc_get_fclk_period(long rate)
-{
- /* In picoseconds */
- return 1000000000 / rate;
-}
-
-static unsigned int sdrc_ps_to_ticks(unsigned int time_ps, long rate)
-{
- unsigned long tick_ps;
-
- /* Calculate in picosecs to yield more exact results */
- tick_ps = sdrc_get_fclk_period(rate);
-
- return (time_ps + tick_ps - 1) / tick_ps;
-}
-#undef DEBUG
-#ifdef DEBUG
-static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
- int ticks, long rate, const char *name)
-#else
-static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
- int ticks)
-#endif
-{
- int mask, nr_bits;
-
- nr_bits = end_bit - st_bit + 1;
- if (ticks >= 1 << nr_bits)
- return -1;
- mask = (1 << nr_bits) - 1;
- *regval &= ~(mask << st_bit);
- *regval |= ticks << st_bit;
-#ifdef DEBUG
- printk(KERN_INFO "SDRC %s: %i ticks %i ns\n", name, ticks,
- (unsigned int)sdrc_get_fclk_period(rate) * ticks /
- 1000);
-#endif
-
- return 0;
-}
-
-#ifdef DEBUG
-#define SDRC_SET_ONE(reg, st, end, field, rate) \
- if (set_sdrc_timing_regval((reg), (st), (end), \
- memory_timings->field, (rate), #field) < 0) \
- err = -1;
-#else
-#define SDRC_SET_ONE(reg, st, end, field, rate) \
- if (set_sdrc_timing_regval((reg), (st), (end), \
- memory_timings->field) < 0) \
- err = -1;
-#endif
-
-#ifdef DEBUG
-static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
- int time, long rate, const char *name)
-#else
-static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
- int time, long rate)
-#endif
-{
- int ticks, ret;
- ret = 0;
-
- if (time == 0)
- ticks = 0;
- else
- ticks = sdrc_ps_to_ticks(time, rate);
-
-#ifdef DEBUG
- ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks,
- rate, name);
-#else
- ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks);
-#endif
-
- return ret;
-}
-
-#ifdef DEBUG
-#define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
- if (set_sdrc_timing_regval_ps((reg), (st), (end), \
- memory_timings->field, \
- (rate), #field) < 0) \
- err = -1;
-
-#else
-#define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
- if (set_sdrc_timing_regval_ps((reg), (st), (end), \
- memory_timings->field, (rate)) < 0) \
- err = -1;
-#endif
-
-static int sdrc_timings(int id, long rate,
- const struct sdram_timings *memory_timings)
-{
- u32 ticks_per_ms;
- u32 rfr, l;
- u32 actim_ctrla = 0, actim_ctrlb = 0;
- u32 rfr_ctrl;
- int err = 0;
- long l3_rate = rate / 1000;
-
- SDRC_SET_ONE_PS(&actim_ctrla, 0, 4, tDAL, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 6, 8, tDPL, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 9, 11, tRRD, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 12, 14, tRCD, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 15, 17, tRP, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 18, 21, tRAS, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 22, 26, tRC, l3_rate);
- SDRC_SET_ONE_PS(&actim_ctrla, 27, 31, tRFC, l3_rate);
-
- SDRC_SET_ONE_PS(&actim_ctrlb, 0, 7, tXSR, l3_rate);
-
- SDRC_SET_ONE(&actim_ctrlb, 8, 10, tXP, l3_rate);
- SDRC_SET_ONE(&actim_ctrlb, 12, 14, tCKE, l3_rate);
- SDRC_SET_ONE(&actim_ctrlb, 16, 17, tWTR, l3_rate);
-
- ticks_per_ms = l3_rate;
- rfr = memory_timings[0].tREF * ticks_per_ms / 1000000;
- if (rfr > 65535 + 50)
- rfr = 65535;
- else
- rfr -= 50;
-
-#ifdef DEBUG
- printk(KERN_INFO "SDRC tREF: %i ticks\n", rfr);
-#endif
-
- l = rfr << 8;
- rfr_ctrl = l | 0x1; /* autorefresh, reload counter with 1xARCV */
-
- nokia_sdrc_params[id].rate = rate;
- nokia_sdrc_params[id].actim_ctrla = actim_ctrla;
- nokia_sdrc_params[id].actim_ctrlb = actim_ctrlb;
- nokia_sdrc_params[id].rfr_ctrl = rfr_ctrl;
- nokia_sdrc_params[id].mr = 0x32;
-
- nokia_sdrc_params[id + 1].rate = 0;
-
- return err;
-}
-
-struct omap_sdrc_params *nokia_get_sdram_timings(void)
-{
- int err = 0;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(nokia_timings); i++) {
- err |= sdrc_timings(i, nokia_timings[i].rate,
- nokia_timings[i].data);
- if (err)
- pr_err("%s: error with rate %ld: %d\n", __func__,
- nokia_timings[i].rate, err);
- }
-
- return err ? NULL : nokia_sdrc_params;
-}
-
git.samba.org / sfrench / cifs-2.6.git / commitdiff