Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 1 | /* |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 2 | * SDRC register values for Nokia boards |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 3 | * |
Igor Dmitriev | ef211dc | 2011-12-13 10:48:54 -0800 | [diff] [blame] | 4 | * Copyright (C) 2008, 2010-2011 Nokia Corporation |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 5 | * |
| 6 | * Lauri Leukkunen <lauri.leukkunen@nokia.com> |
| 7 | * |
| 8 | * Original code by Juha Yrjola <juha.yrjola@solidboot.com> |
| 9 | * |
| 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. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/io.h> |
| 19 | |
| 20 | #include <plat/io.h> |
Tony Lindgren | 4e65331 | 2011-11-10 22:45:17 +0100 | [diff] [blame] | 21 | #include "common.h" |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 22 | #include <plat/clock.h> |
| 23 | #include <plat/sdrc.h> |
| 24 | |
Aaro Koskinen | fcd8d846 | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 25 | #include "sdram-nokia.h" |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 26 | |
| 27 | /* In picoseconds, except for tREF (ns), tXP, tCKE, tWTR (clks) */ |
| 28 | struct sdram_timings { |
| 29 | u32 casl; |
| 30 | u32 tDAL; |
| 31 | u32 tDPL; |
| 32 | u32 tRRD; |
| 33 | u32 tRCD; |
| 34 | u32 tRP; |
| 35 | u32 tRAS; |
| 36 | u32 tRC; |
| 37 | u32 tRFC; |
| 38 | u32 tXSR; |
| 39 | |
| 40 | u32 tREF; /* in ns */ |
| 41 | |
| 42 | u32 tXP; |
| 43 | u32 tCKE; |
| 44 | u32 tWTR; |
| 45 | }; |
| 46 | |
Aaro Koskinen | 20dbeb1 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 47 | static const struct sdram_timings nokia_97dot6mhz_timings[] = { |
| 48 | { |
| 49 | .casl = 3, |
| 50 | .tDAL = 30725, |
| 51 | .tDPL = 15362, |
| 52 | .tRRD = 10241, |
| 53 | .tRCD = 20483, |
| 54 | .tRP = 15362, |
| 55 | .tRAS = 40967, |
| 56 | .tRC = 56330, |
| 57 | .tRFC = 138266, |
| 58 | .tXSR = 204839, |
| 59 | |
| 60 | .tREF = 7798, |
| 61 | |
| 62 | .tXP = 2, |
| 63 | .tCKE = 4, |
| 64 | .tWTR = 2, |
| 65 | }, |
| 66 | }; |
| 67 | |
Aaro Koskinen | fbd208e | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 68 | static const struct sdram_timings nokia_166mhz_timings[] = { |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 69 | { |
| 70 | .casl = 3, |
| 71 | .tDAL = 33000, |
| 72 | .tDPL = 15000, |
| 73 | .tRRD = 12000, |
| 74 | .tRCD = 22500, |
| 75 | .tRP = 18000, |
| 76 | .tRAS = 42000, |
| 77 | .tRC = 66000, |
| 78 | .tRFC = 138000, |
| 79 | .tXSR = 200000, |
| 80 | |
| 81 | .tREF = 7800, |
| 82 | |
| 83 | .tXP = 2, |
| 84 | .tCKE = 2, |
| 85 | .tWTR = 2 |
| 86 | }, |
| 87 | }; |
| 88 | |
Aaro Koskinen | 20dbeb1 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 89 | static const struct sdram_timings nokia_195dot2mhz_timings[] = { |
| 90 | { |
| 91 | .casl = 3, |
| 92 | .tDAL = 30725, |
| 93 | .tDPL = 15362, |
| 94 | .tRRD = 10241, |
| 95 | .tRCD = 20483, |
| 96 | .tRP = 15362, |
| 97 | .tRAS = 40967, |
| 98 | .tRC = 56330, |
| 99 | .tRFC = 138266, |
| 100 | .tXSR = 204839, |
| 101 | |
| 102 | .tREF = 7752, |
| 103 | |
| 104 | .tXP = 2, |
| 105 | .tCKE = 4, |
| 106 | .tWTR = 2, |
| 107 | }, |
| 108 | }; |
| 109 | |
Igor Dmitriev | ef211dc | 2011-12-13 10:48:54 -0800 | [diff] [blame] | 110 | static const struct sdram_timings nokia_200mhz_timings[] = { |
| 111 | { |
| 112 | .casl = 3, |
| 113 | .tDAL = 30000, |
| 114 | .tDPL = 15000, |
| 115 | .tRRD = 10000, |
| 116 | .tRCD = 20000, |
| 117 | .tRP = 15000, |
| 118 | .tRAS = 40000, |
| 119 | .tRC = 55000, |
| 120 | .tRFC = 140000, |
| 121 | .tXSR = 200000, |
| 122 | |
| 123 | .tREF = 7800, |
| 124 | |
| 125 | .tXP = 2, |
| 126 | .tCKE = 4, |
| 127 | .tWTR = 2 |
| 128 | }, |
| 129 | }; |
| 130 | |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 131 | static const struct { |
| 132 | long rate; |
| 133 | struct sdram_timings const *data; |
| 134 | } nokia_timings[] = { |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 135 | { 83000000, nokia_166mhz_timings }, |
Aaro Koskinen | 20dbeb1 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 136 | { 97600000, nokia_97dot6mhz_timings }, |
Igor Dmitriev | ef211dc | 2011-12-13 10:48:54 -0800 | [diff] [blame] | 137 | { 100000000, nokia_200mhz_timings }, |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 138 | { 166000000, nokia_166mhz_timings }, |
Aaro Koskinen | 20dbeb1 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 139 | { 195200000, nokia_195dot2mhz_timings }, |
Igor Dmitriev | ef211dc | 2011-12-13 10:48:54 -0800 | [diff] [blame] | 140 | { 200000000, nokia_200mhz_timings }, |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 141 | }; |
| 142 | static struct omap_sdrc_params nokia_sdrc_params[ARRAY_SIZE(nokia_timings) + 1]; |
| 143 | |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 144 | static unsigned long sdrc_get_fclk_period(long rate) |
| 145 | { |
| 146 | /* In picoseconds */ |
| 147 | return 1000000000 / rate; |
| 148 | } |
| 149 | |
| 150 | static unsigned int sdrc_ps_to_ticks(unsigned int time_ps, long rate) |
| 151 | { |
| 152 | unsigned long tick_ps; |
| 153 | |
| 154 | /* Calculate in picosecs to yield more exact results */ |
| 155 | tick_ps = sdrc_get_fclk_period(rate); |
| 156 | |
| 157 | return (time_ps + tick_ps - 1) / tick_ps; |
| 158 | } |
| 159 | #undef DEBUG |
| 160 | #ifdef DEBUG |
| 161 | static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit, |
| 162 | int ticks, long rate, const char *name) |
| 163 | #else |
| 164 | static int set_sdrc_timing_regval(u32 *regval, int st_bit, int end_bit, |
| 165 | int ticks) |
| 166 | #endif |
| 167 | { |
| 168 | int mask, nr_bits; |
| 169 | |
| 170 | nr_bits = end_bit - st_bit + 1; |
| 171 | if (ticks >= 1 << nr_bits) |
| 172 | return -1; |
| 173 | mask = (1 << nr_bits) - 1; |
| 174 | *regval &= ~(mask << st_bit); |
| 175 | *regval |= ticks << st_bit; |
| 176 | #ifdef DEBUG |
| 177 | printk(KERN_INFO "SDRC %s: %i ticks %i ns\n", name, ticks, |
| 178 | (unsigned int)sdrc_get_fclk_period(rate) * ticks / |
| 179 | 1000); |
| 180 | #endif |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | #ifdef DEBUG |
| 186 | #define SDRC_SET_ONE(reg, st, end, field, rate) \ |
| 187 | if (set_sdrc_timing_regval((reg), (st), (end), \ |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 188 | memory_timings->field, (rate), #field) < 0) \ |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 189 | err = -1; |
| 190 | #else |
| 191 | #define SDRC_SET_ONE(reg, st, end, field, rate) \ |
| 192 | if (set_sdrc_timing_regval((reg), (st), (end), \ |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 193 | memory_timings->field) < 0) \ |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 194 | err = -1; |
| 195 | #endif |
| 196 | |
| 197 | #ifdef DEBUG |
| 198 | static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit, |
| 199 | int time, long rate, const char *name) |
| 200 | #else |
| 201 | static int set_sdrc_timing_regval_ps(u32 *regval, int st_bit, int end_bit, |
| 202 | int time, long rate) |
| 203 | #endif |
| 204 | { |
| 205 | int ticks, ret; |
| 206 | ret = 0; |
| 207 | |
| 208 | if (time == 0) |
| 209 | ticks = 0; |
| 210 | else |
| 211 | ticks = sdrc_ps_to_ticks(time, rate); |
| 212 | |
| 213 | #ifdef DEBUG |
| 214 | ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks, |
| 215 | rate, name); |
| 216 | #else |
| 217 | ret = set_sdrc_timing_regval(regval, st_bit, end_bit, ticks); |
| 218 | #endif |
| 219 | |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | #ifdef DEBUG |
| 224 | #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \ |
| 225 | if (set_sdrc_timing_regval_ps((reg), (st), (end), \ |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 226 | memory_timings->field, \ |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 227 | (rate), #field) < 0) \ |
| 228 | err = -1; |
| 229 | |
| 230 | #else |
| 231 | #define SDRC_SET_ONE_PS(reg, st, end, field, rate) \ |
| 232 | if (set_sdrc_timing_regval_ps((reg), (st), (end), \ |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 233 | memory_timings->field, (rate)) < 0) \ |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 234 | err = -1; |
| 235 | #endif |
| 236 | |
Aaro Koskinen | fbd208e | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 237 | static int sdrc_timings(int id, long rate, |
| 238 | const struct sdram_timings *memory_timings) |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 239 | { |
| 240 | u32 ticks_per_ms; |
| 241 | u32 rfr, l; |
| 242 | u32 actim_ctrla = 0, actim_ctrlb = 0; |
| 243 | u32 rfr_ctrl; |
| 244 | int err = 0; |
| 245 | long l3_rate = rate / 1000; |
| 246 | |
| 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); |
| 255 | |
| 256 | SDRC_SET_ONE_PS(&actim_ctrlb, 0, 7, tXSR, l3_rate); |
| 257 | |
| 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); |
| 261 | |
| 262 | ticks_per_ms = l3_rate; |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 263 | rfr = memory_timings[0].tREF * ticks_per_ms / 1000000; |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 264 | if (rfr > 65535 + 50) |
| 265 | rfr = 65535; |
| 266 | else |
| 267 | rfr -= 50; |
| 268 | |
| 269 | #ifdef DEBUG |
| 270 | printk(KERN_INFO "SDRC tREF: %i ticks\n", rfr); |
| 271 | #endif |
| 272 | |
| 273 | l = rfr << 8; |
| 274 | rfr_ctrl = l | 0x1; /* autorefresh, reload counter with 1xARCV */ |
| 275 | |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 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; |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 281 | |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 282 | nokia_sdrc_params[id + 1].rate = 0; |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 283 | |
| 284 | return err; |
| 285 | } |
| 286 | |
Aaro Koskinen | 6c3bc4e | 2010-12-17 15:13:44 -0800 | [diff] [blame] | 287 | struct omap_sdrc_params *nokia_get_sdram_timings(void) |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 288 | { |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 289 | int err = 0; |
| 290 | int i; |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 291 | |
Aaro Koskinen | 2b1af87 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 292 | for (i = 0; i < ARRAY_SIZE(nokia_timings); i++) { |
Aaro Koskinen | e5f5b54 | 2010-12-17 15:13:45 -0800 | [diff] [blame] | 293 | err |= sdrc_timings(i, nokia_timings[i].rate, |
| 294 | nokia_timings[i].data); |
Aaro Koskinen | 2b1af87 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 295 | if (err) |
| 296 | pr_err("%s: error with rate %ld: %d\n", __func__, |
| 297 | nokia_timings[i].rate, err); |
| 298 | } |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 299 | |
Aaro Koskinen | 2b1af87 | 2010-12-17 15:13:46 -0800 | [diff] [blame] | 300 | return err ? NULL : nokia_sdrc_params; |
Tero Kristo | 2000655 | 2009-11-22 10:11:36 -0800 | [diff] [blame] | 301 | } |
| 302 | |