2 * SDRC register values for Nokia boards
4 * Copyright (C) 2008, 2010-2011 Nokia Corporation
6 * Lauri Leukkunen <lauri.leukkunen@nokia.com>
8 * Original code by Juha Yrjola <juha.yrjola@solidboot.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/kernel.h>
16 #include <linux/clk.h>
17 #include <linux/err.h>
22 #include <plat/clock.h>
23 #include <plat/sdrc.h>
25 #include "sdram-nokia.h"
27 /* In picoseconds, except for tREF (ns), tXP, tCKE, tWTR (clks) */
28 struct sdram_timings {
47 static const struct sdram_timings nokia_97dot6mhz_timings[] = {
68 static const struct sdram_timings nokia_166mhz_timings[] = {
89 static const struct sdram_timings nokia_195dot2mhz_timings[] = {
110 static const struct sdram_timings nokia_200mhz_timings[] = {
131 static const struct {
133 struct sdram_timings const *data;
134 } nokia_timings[] = {
135 { 83000000, nokia_166mhz_timings },
136 { 97600000, nokia_97dot6mhz_timings },
137 { 100000000, nokia_200mhz_timings },
138 { 166000000, nokia_166mhz_timings },
139 { 195200000, nokia_195dot2mhz_timings },
140 { 200000000, nokia_200mhz_timings },
142 static struct omap_sdrc_params nokia_sdrc_params[ARRAY_SIZE(nokia_timings) + 1];
144 static unsigned long sdrc_get_fclk_period(long rate)
147 return 1000000000 / rate;
150 static unsigned int sdrc_ps_to_ticks(unsigned int time_ps, long rate)
152 unsigned long tick_ps;
154 /* Calculate in picosecs to yield more exact results */
155 tick_ps = sdrc_get_fclk_period(rate);
157 return (time_ps + tick_ps - 1) / tick_ps;
161 static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
162 int ticks, long rate, const char *name)
164 static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
170 nr_bits = end_bit - st_bit + 1;
171 if (ticks >= 1 << nr_bits)
173 mask = (1 << nr_bits) - 1;
174 *regval &= ~(mask << st_bit);
175 *regval |= ticks << st_bit;
177 printk(KERN_INFO "SDRC %s: %i ticks %i ns\n", name, ticks,
178 (unsigned int)sdrc_get_fclk_period(rate) * ticks /
186 #define SDRC_SET_ONE(reg, st, end, field, rate) \
187 if (set_sdrc_timing_regval((reg), (st), (end), \
188 memory_timings->field, (rate), #field) < 0) \
191 #define SDRC_SET_ONE(reg, st, end, field, rate) \
192 if (set_sdrc_timing_regval((reg), (st), (end), \
193 memory_timings->field) < 0) \
198 static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
199 int time, long rate, const char *name)
201 static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
211 ticks = sdrc_ps_to_ticks(time, rate);
214 ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks,
217 ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks);
224 #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
225 if (set_sdrc_timing_regval_ps((reg), (st), (end), \
226 memory_timings->field, \
227 (rate), #field) < 0) \
231 #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
232 if (set_sdrc_timing_regval_ps((reg), (st), (end), \
233 memory_timings->field, (rate)) < 0) \
237 static int sdrc_timings(int id, long rate,
238 const struct sdram_timings *memory_timings)
242 u32 actim_ctrla = 0, actim_ctrlb = 0;
245 long l3_rate = rate / 1000;
247 SDRC_SET_ONE_PS(&actim_ctrla, 0, 4, tDAL, l3_rate);
248 SDRC_SET_ONE_PS(&actim_ctrla, 6, 8, tDPL, l3_rate);
249 SDRC_SET_ONE_PS(&actim_ctrla, 9, 11, tRRD, l3_rate);
250 SDRC_SET_ONE_PS(&actim_ctrla, 12, 14, tRCD, l3_rate);
251 SDRC_SET_ONE_PS(&actim_ctrla, 15, 17, tRP, l3_rate);
252 SDRC_SET_ONE_PS(&actim_ctrla, 18, 21, tRAS, l3_rate);
253 SDRC_SET_ONE_PS(&actim_ctrla, 22, 26, tRC, l3_rate);
254 SDRC_SET_ONE_PS(&actim_ctrla, 27, 31, tRFC, l3_rate);
256 SDRC_SET_ONE_PS(&actim_ctrlb, 0, 7, tXSR, l3_rate);
258 SDRC_SET_ONE(&actim_ctrlb, 8, 10, tXP, l3_rate);
259 SDRC_SET_ONE(&actim_ctrlb, 12, 14, tCKE, l3_rate);
260 SDRC_SET_ONE(&actim_ctrlb, 16, 17, tWTR, l3_rate);
262 ticks_per_ms = l3_rate;
263 rfr = memory_timings[0].tREF * ticks_per_ms / 1000000;
264 if (rfr > 65535 + 50)
270 printk(KERN_INFO "SDRC tREF: %i ticks\n", rfr);
274 rfr_ctrl = l | 0x1; /* autorefresh, reload counter with 1xARCV */
276 nokia_sdrc_params[id].rate = rate;
277 nokia_sdrc_params[id].actim_ctrla = actim_ctrla;
278 nokia_sdrc_params[id].actim_ctrlb = actim_ctrlb;
279 nokia_sdrc_params[id].rfr_ctrl = rfr_ctrl;
280 nokia_sdrc_params[id].mr = 0x32;
282 nokia_sdrc_params[id + 1].rate = 0;
287 struct omap_sdrc_params *nokia_get_sdram_timings(void)
292 for (i = 0; i < ARRAY_SIZE(nokia_timings); i++) {
293 err |= sdrc_timings(i, nokia_timings[i].rate,
294 nokia_timings[i].data);
296 pr_err("%s: error with rate %ld: %d\n", __func__,
297 nokia_timings[i].rate, err);
300 return err ? NULL : nokia_sdrc_params;