Angel Pons | 4b42983 | 2020-04-02 23:48:50 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* This file is part of the coreboot project. */ |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 3 | |
| 4 | #include <stdint.h> |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 5 | #include <device/mmio.h> |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 6 | #include <console/console.h> |
| 7 | #include "gm45.h" |
| 8 | |
| 9 | #define CxRECy_MCHBAR(x, y) (0x14a0 + (x * 0x0100) + ((3 - y) * 4)) |
| 10 | #define CxRECy_SHIFT_L 0 |
| 11 | #define CxRECy_MASK_L (3 << CxRECy_SHIFT_L) |
| 12 | #define CxRECy_SHIFT_H 16 |
| 13 | #define CxRECy_MASK_H (3 << CxRECy_SHIFT_H) |
| 14 | #define CxRECy_T_SHIFT 28 |
| 15 | #define CxRECy_T_MASK (0xf << CxRECy_T_SHIFT) |
| 16 | #define CxRECy_T(t) ((t << CxRECy_T_SHIFT) & CxRECy_T_MASK) |
| 17 | #define CxRECy_P_SHIFT 24 |
| 18 | #define CxRECy_P_MASK (0x7 << CxRECy_P_SHIFT) |
| 19 | #define CxRECy_P(p) ((p << CxRECy_P_SHIFT) & CxRECy_P_MASK) |
| 20 | #define CxRECy_PH_SHIFT 22 |
| 21 | #define CxRECy_PH_MASK (0x3 << CxRECy_PH_SHIFT) |
| 22 | #define CxRECy_PH(p) ((p << CxRECy_PH_SHIFT) & CxRECy_PH_MASK) |
| 23 | #define CxRECy_PM_SHIFT 20 |
| 24 | #define CxRECy_PM_MASK (0x3 << CxRECy_PM_SHIFT) |
| 25 | #define CxRECy_PM(p) ((p << CxRECy_PM_SHIFT) & CxRECy_PM_MASK) |
| 26 | #define CxRECy_TIMING_MASK (CxRECy_T_MASK | CxRECy_P_MASK | \ |
| 27 | CxRECy_PH_MASK | CxRECy_PM_MASK) |
| 28 | |
| 29 | #define CxDRT3_C_SHIFT 7 |
| 30 | #define CxDRT3_C_MASK (0xf << CxDRT3_C_SHIFT) |
| 31 | #define CxDRT3_C(c) ((c << CxDRT3_C_SHIFT) & CxDRT3_C_MASK) |
| 32 | /* group to byte-lane mapping: (cardF X group X 2 per group) */ |
| 33 | static const char bytelane_map[2][4][2] = { |
| 34 | /* A,B,C */{ { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 } }, |
| 35 | /* F */{ { 0, 2 }, { 1, 3 }, { 4, 6 }, { 5, 7 } }, |
| 36 | }; |
| 37 | |
| 38 | #define PH_BOUND 4 |
| 39 | #define PH_STEP 2 |
| 40 | #define PM_BOUND 3 |
| 41 | #define C_BOUND 16 |
| 42 | typedef struct { |
| 43 | int c; |
| 44 | int pre; |
| 45 | int ph; |
| 46 | int t; |
| 47 | const int t_bound; |
| 48 | int p; |
| 49 | const int p_bound; |
| 50 | } rec_timing_t; |
| 51 | static void normalize_rec_timing(rec_timing_t *const timing) |
| 52 | { |
| 53 | while (timing->p >= timing->p_bound) { |
| 54 | timing->t++; |
| 55 | timing->p -= timing->p_bound; |
| 56 | } |
| 57 | while (timing->p < 0) { |
| 58 | timing->t--; |
| 59 | timing->p += timing->p_bound; |
| 60 | } |
| 61 | while (timing->t >= timing->t_bound) { |
| 62 | timing->ph += PH_STEP; |
| 63 | timing->t -= timing->t_bound; |
| 64 | } |
| 65 | while (timing->t < 0) { |
| 66 | timing->ph -= PH_STEP; |
| 67 | timing->t += timing->t_bound; |
| 68 | } |
| 69 | while (timing->ph >= PH_BOUND) { |
| 70 | timing->c++; |
| 71 | timing->ph -= PH_BOUND; |
| 72 | } |
| 73 | while (timing->ph < 0) { |
| 74 | timing->c--; |
| 75 | timing->ph += PH_BOUND; |
| 76 | } |
| 77 | if (timing->c < 0 || timing->c >= C_BOUND) |
| 78 | die("Timing under-/overflow during " |
| 79 | "receive-enable calibration.\n"); |
| 80 | } |
| 81 | |
| 82 | static void rec_full_backstep(rec_timing_t *const timing) |
| 83 | { |
| 84 | timing->c--; |
| 85 | } |
| 86 | static void rec_half_backstep(rec_timing_t *const timing) |
| 87 | { |
| 88 | timing->ph -= PH_STEP; |
| 89 | } |
| 90 | static void rec_quarter_step(rec_timing_t *const timing) |
| 91 | { |
| 92 | timing->t += (timing->t_bound) >> 1; |
| 93 | timing->p += (timing->t_bound & 1) * (timing->p_bound >> 1); |
| 94 | } |
| 95 | static void rec_quarter_backstep(rec_timing_t *const timing) |
| 96 | { |
| 97 | timing->t -= (timing->t_bound) >> 1; |
| 98 | timing->p -= (timing->t_bound & 1) * (timing->p_bound >> 1); |
| 99 | } |
| 100 | static void rec_smallest_step(rec_timing_t *const timing) |
| 101 | { |
| 102 | timing->p++; |
| 103 | } |
| 104 | |
| 105 | static void program_timing(int channel, int group, |
| 106 | rec_timing_t timings[][4]) |
| 107 | { |
| 108 | rec_timing_t *const timing = &timings[channel][group]; |
| 109 | |
| 110 | normalize_rec_timing(timing); |
| 111 | |
| 112 | /* C value is per channel. */ |
| 113 | unsigned int mchbar = CxDRT3_MCHBAR(channel); |
| 114 | MCHBAR32(mchbar) = (MCHBAR32(mchbar) & ~CxDRT3_C_MASK) | |
| 115 | CxDRT3_C(timing->c); |
| 116 | |
| 117 | /* All other per group. */ |
| 118 | mchbar = CxRECy_MCHBAR(channel, group); |
| 119 | u32 reg = MCHBAR32(mchbar); |
| 120 | reg &= ~CxRECy_TIMING_MASK; |
| 121 | reg |= CxRECy_T(timing->t) | CxRECy_P(timing->p) | |
| 122 | CxRECy_PH(timing->ph) | CxRECy_PM(timing->pre); |
| 123 | MCHBAR32(mchbar) = reg; |
| 124 | } |
| 125 | |
| 126 | static int read_dqs_level(const int channel, const int lane) |
| 127 | { |
| 128 | unsigned int mchbar = 0x14f0 + (channel * 0x0100); |
| 129 | MCHBAR32(mchbar) &= ~(1 << 9); |
| 130 | MCHBAR32(mchbar) |= (1 << 9); |
| 131 | |
| 132 | /* Read from this channel. */ |
Kevin Paul Herbert | bde6d30 | 2014-12-24 18:43:20 -0800 | [diff] [blame] | 133 | read32((u32 *)raminit_get_rank_addr(channel, 0)); |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 134 | |
| 135 | mchbar = 0x14b0 + (channel * 0x0100) + ((7 - lane) * 4); |
| 136 | return MCHBAR32(mchbar) & (1 << 30); |
| 137 | } |
| 138 | |
| 139 | static void find_dqs_low(const int channel, const int group, |
| 140 | rec_timing_t timings[][4], const char lane_map[][2]) |
| 141 | { |
| 142 | /* Look for DQS low, using quarter steps. */ |
| 143 | while (read_dqs_level(channel, lane_map[group][0]) || |
| 144 | read_dqs_level(channel, lane_map[group][1])) { |
| 145 | rec_quarter_step(&timings[channel][group]); |
| 146 | program_timing(channel, group, timings); |
| 147 | } |
| 148 | } |
| 149 | static void find_dqs_high(const int channel, const int group, |
| 150 | rec_timing_t timings[][4], const char lane_map[][2]) |
| 151 | { |
| 152 | /* Look for _any_ DQS high, using quarter steps. */ |
| 153 | while (!read_dqs_level(channel, lane_map[group][0]) && |
| 154 | !read_dqs_level(channel, lane_map[group][1])) { |
| 155 | rec_quarter_step(&timings[channel][group]); |
| 156 | program_timing(channel, group, timings); |
| 157 | } |
| 158 | } |
| 159 | static void find_dqs_edge_lowhigh(const int channel, const int group, |
| 160 | rec_timing_t timings[][4], |
| 161 | const char lane_map[][2]) |
| 162 | { |
| 163 | /* Advance beyond previous high to low transition. */ |
| 164 | timings[channel][group].t += 2; |
| 165 | program_timing(channel, group, timings); |
| 166 | |
| 167 | /* Coarsely look for DQS high. */ |
| 168 | find_dqs_high(channel, group, timings, lane_map); |
| 169 | |
| 170 | /* Go back and perform finer search. */ |
| 171 | rec_quarter_backstep(&timings[channel][group]); |
| 172 | program_timing(channel, group, timings); |
| 173 | while (!read_dqs_level(channel, lane_map[group][0]) || |
| 174 | !read_dqs_level(channel, lane_map[group][1])) { |
| 175 | rec_smallest_step(&timings[channel][group]); |
| 176 | program_timing(channel, group, timings); |
| 177 | } |
| 178 | } |
| 179 | static void find_preamble(const int channel, const int group, |
| 180 | rec_timing_t timings[][4], const char lane_map[][2]) |
| 181 | { |
| 182 | /* Look for DQS low, backstepping. */ |
| 183 | while (read_dqs_level(channel, lane_map[group][0]) || |
| 184 | read_dqs_level(channel, lane_map[group][1])) { |
| 185 | rec_full_backstep(&timings[channel][group]); |
| 186 | program_timing(channel, group, timings); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | static void receive_enable_calibration(const timings_t *const timings, |
| 191 | const dimminfo_t *const dimms) |
| 192 | { |
| 193 | /* Override group to byte-lane mapping for raw card type F DIMMS. */ |
| 194 | static const char over_bytelane_map[2][4][2] = { |
| 195 | /* A,B,C */{ { 0, 1 }, { 2, 3 }, { 4, 5 }, { 6, 7 } }, |
| 196 | /* F */{ { 0, 0 }, { 3, 3 }, { 6, 6 }, { 5, 5 } }, |
| 197 | }; |
| 198 | |
Tristan Corrick | 267d086 | 2017-05-10 22:31:14 +1200 | [diff] [blame] | 199 | const int cardF[] = { |
| 200 | dimms[0].card_type == 0xf, |
Tristan Corrick | 12e6562 | 2017-05-10 22:40:41 +1200 | [diff] [blame] | 201 | dimms[1].card_type == 0xf, |
Tristan Corrick | 267d086 | 2017-05-10 22:31:14 +1200 | [diff] [blame] | 202 | }; |
| 203 | |
| 204 | const unsigned int t_bound = |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 205 | (timings->mem_clock == MEM_CLOCK_1067MT) ? 9 : 12; |
Tristan Corrick | 267d086 | 2017-05-10 22:31:14 +1200 | [diff] [blame] | 206 | const unsigned int p_bound = |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 207 | (timings->mem_clock == MEM_CLOCK_1067MT) ? 8 : 1; |
| 208 | |
| 209 | rec_timing_t rec_timings[2][4] = { |
| 210 | { |
| 211 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 212 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 213 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 214 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound } |
| 215 | }, { |
| 216 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 217 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 218 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound }, |
| 219 | { timings->CAS + 1, 0, 0, 0, t_bound, 0, p_bound } |
| 220 | } |
| 221 | }; |
| 222 | |
| 223 | int ch, group; |
| 224 | FOR_EACH_POPULATED_CHANNEL(dimms, ch) { |
| 225 | const char (*const map)[2] = over_bytelane_map[cardF[ch]]; |
| 226 | for (group = 0; group < 4; ++group) { |
| 227 | program_timing(ch, group, rec_timings); |
| 228 | find_dqs_low(ch, group, rec_timings, map); |
| 229 | find_dqs_edge_lowhigh(ch, group, rec_timings, map); |
| 230 | |
| 231 | rec_quarter_step(&rec_timings[ch][group]); |
| 232 | program_timing(ch, group, rec_timings); |
| 233 | find_preamble(ch, group, rec_timings, map); |
| 234 | find_dqs_edge_lowhigh(ch, group, rec_timings, map); |
| 235 | rec_half_backstep(&rec_timings[ch][group]); |
| 236 | normalize_rec_timing(&rec_timings[ch][group]); |
| 237 | if (cardF[ch]) { |
| 238 | rec_timings[ch][group].t++; |
| 239 | program_timing(ch, group, rec_timings); |
| 240 | } |
| 241 | } |
| 242 | int c_min = C_BOUND; |
| 243 | for (group = 0; group < 4; ++group) { |
| 244 | if (rec_timings[ch][group].c < c_min) |
| 245 | c_min = rec_timings[ch][group].c; |
| 246 | } |
| 247 | for (group = 0; group < 4; ++group) { |
| 248 | rec_timings[ch][group].pre = |
| 249 | rec_timings[ch][group].c - c_min; |
| 250 | rec_timings[ch][group].c = c_min; |
| 251 | program_timing(ch, group, rec_timings); |
Nico Huber | 0624f92 | 2017-04-15 15:57:28 +0200 | [diff] [blame] | 252 | printk(RAM_DEBUG, "Final timings for "); |
| 253 | printk(BIOS_DEBUG, "group %d, ch %d: %d.%d.%d.%d.%d\n", |
Patrick Georgi | 2efc880 | 2012-11-06 11:03:53 +0100 | [diff] [blame] | 254 | group, ch, |
| 255 | rec_timings[ch][group].c, |
| 256 | rec_timings[ch][group].pre, |
| 257 | rec_timings[ch][group].ph, |
| 258 | rec_timings[ch][group].t, |
| 259 | rec_timings[ch][group].p); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | void raminit_receive_enable_calibration(const timings_t *const timings, |
| 265 | const dimminfo_t *const dimms) |
| 266 | { |
| 267 | int ch; |
| 268 | |
| 269 | /* Setup group to byte-lane mapping. */ |
| 270 | FOR_EACH_POPULATED_CHANNEL(dimms, ch) { |
| 271 | const char (*const map)[2] = |
| 272 | bytelane_map[dimms[ch].card_type == 0xf]; |
| 273 | unsigned int group; |
| 274 | for (group = 0; group < 4; ++group) { |
| 275 | const unsigned int mchbar = CxRECy_MCHBAR(ch, group); |
| 276 | u32 reg = MCHBAR32(mchbar); |
| 277 | reg &= ~((3 << 16) | (1 << 8) | 3); |
| 278 | reg |= (map[group][0] - group); |
| 279 | reg |= (map[group][1] - group - 1) << 16; |
| 280 | MCHBAR32(mchbar) = reg; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | MCHBAR32(0x12a4) |= 1 << 31; |
| 285 | MCHBAR32(0x13a4) |= 1 << 31; |
| 286 | MCHBAR32(0x14f0) = (MCHBAR32(0x14f0) & ~(3 << 9)) | (1 << 9); |
| 287 | MCHBAR32(0x15f0) = (MCHBAR32(0x15f0) & ~(3 << 9)) | (1 << 9); |
| 288 | |
| 289 | receive_enable_calibration(timings, dimms); |
| 290 | |
| 291 | MCHBAR32(0x12a4) &= ~(1 << 31); |
| 292 | MCHBAR32(0x13a4) &= ~(1 << 31); |
| 293 | raminit_reset_readwrite_pointers(); |
| 294 | } |