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>
21 #include <plat/clock.h>
22 #include <plat/sdrc.h>
24 #include "sdram-nokia.h"
26 /* In picoseconds, except for tREF (ns), tXP, tCKE, tWTR (clks) */
27 struct sdram_timings {
46 static const struct sdram_timings nokia_97dot6mhz_timings[] = {
67 static const struct sdram_timings nokia_166mhz_timings[] = {
88 static const struct sdram_timings nokia_195dot2mhz_timings[] = {
109 static const struct sdram_timings nokia_200mhz_timings[] = {
130 static const struct {
132 struct sdram_timings const *data;
133 } nokia_timings[] = {
134 { 83000000, nokia_166mhz_timings },
135 { 97600000, nokia_97dot6mhz_timings },
136 { 100000000, nokia_200mhz_timings },
137 { 166000000, nokia_166mhz_timings },
138 { 195200000, nokia_195dot2mhz_timings },
139 { 200000000, nokia_200mhz_timings },
141 static struct omap_sdrc_params nokia_sdrc_params[ARRAY_SIZE(nokia_timings) + 1];
143 static unsigned long sdrc_get_fclk_period(long rate)
146 return 1000000000 / rate;
149 static unsigned int sdrc_ps_to_ticks(unsigned int time_ps, long rate)
151 unsigned long tick_ps;
153 /* Calculate in picosecs to yield more exact results */
154 tick_ps = sdrc_get_fclk_period(rate);
156 return (time_ps + tick_ps - 1) / tick_ps;
160 static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
161 int ticks, long rate, const char *name)
163 static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit,
169 nr_bits = end_bit - st_bit + 1;
170 if (ticks >= 1 << nr_bits)
172 mask = (1 << nr_bits) - 1;
173 *regval &= ~(mask << st_bit);
174 *regval |= ticks << st_bit;
176 printk(KERN_INFO "SDRC %s: %i ticks %i ns\n", name, ticks,
177 (unsigned int)sdrc_get_fclk_period(rate) * ticks /
185 #define SDRC_SET_ONE(reg, st, end, field, rate) \
186 if (set_sdrc_timing_regval((reg), (st), (end), \
187 memory_timings->field, (rate), #field) < 0) \
190 #define SDRC_SET_ONE(reg, st, end, field, rate) \
191 if (set_sdrc_timing_regval((reg), (st), (end), \
192 memory_timings->field) < 0) \
197 static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
198 int time, long rate, const char *name)
200 static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit,
210 ticks = sdrc_ps_to_ticks(time, rate);
213 ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks,
216 ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks);
223 #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
224 if (set_sdrc_timing_regval_ps((reg), (st), (end), \
225 memory_timings->field, \
226 (rate), #field) < 0) \
230 #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \
231 if (set_sdrc_timing_regval_ps((reg), (st), (end), \
232 memory_timings->field, (rate)) < 0) \
236 static int sdrc_timings(int id, long rate,
237 const struct sdram_timings *memory_timings)
241 u32 actim_ctrla = 0, actim_ctrlb = 0;
244 long l3_rate = rate / 1000;
246 SDRC_SET_ONE_PS(&actim_ctrla, 0, 4, tDAL, l3_rate);
247 SDRC_SET_ONE_PS(&actim_ctrla, 6, 8, tDPL, l3_rate);
248 SDRC_SET_ONE_PS(&actim_ctrla, 9, 11, tRRD, l3_rate);
249 SDRC_SET_ONE_PS(&actim_ctrla, 12, 14, tRCD, l3_rate);
250 SDRC_SET_ONE_PS(&actim_ctrla, 15, 17, tRP, l3_rate);
251 SDRC_SET_ONE_PS(&actim_ctrla, 18, 21, tRAS, l3_rate);
252 SDRC_SET_ONE_PS(&actim_ctrla, 22, 26, tRC, l3_rate);
253 SDRC_SET_ONE_PS(&actim_ctrla, 27, 31, tRFC, l3_rate);
255 SDRC_SET_ONE_PS(&actim_ctrlb, 0, 7, tXSR, l3_rate);
257 SDRC_SET_ONE(&actim_ctrlb, 8, 10, tXP, l3_rate);
258 SDRC_SET_ONE(&actim_ctrlb, 12, 14, tCKE, l3_rate);
259 SDRC_SET_ONE(&actim_ctrlb, 16, 17, tWTR, l3_rate);
261 ticks_per_ms = l3_rate;
262 rfr = memory_timings[0].tREF * ticks_per_ms / 1000000;
263 if (rfr > 65535 + 50)
269 printk(KERN_INFO "SDRC tREF: %i ticks\n", rfr);
273 rfr_ctrl = l | 0x1; /* autorefresh, reload counter with 1xARCV */
275 nokia_sdrc_params[id].rate = rate;
276 nokia_sdrc_params[id].actim_ctrla = actim_ctrla;
277 nokia_sdrc_params[id].actim_ctrlb = actim_ctrlb;
278 nokia_sdrc_params[id].rfr_ctrl = rfr_ctrl;
279 nokia_sdrc_params[id].mr = 0x32;
281 nokia_sdrc_params[id + 1].rate = 0;
286 struct omap_sdrc_params *nokia_get_sdram_timings(void)
291 for (i = 0; i < ARRAY_SIZE(nokia_timings); i++) {
292 err |= sdrc_timings(i, nokia_timings[i].rate,
293 nokia_timings[i].data);
295 pr_err("%s: error with rate %ld: %d\n", __func__,
296 nokia_timings[i].rate, err);
299 return err ? NULL : nokia_sdrc_params;