Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 1 | /* |
Stefan Reinauer | 7e61e45 | 2008-01-18 10:35:56 +0000 | [diff] [blame] | 2 | * This file is part of the coreboot project. |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 3 | * |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 4 | * Copyright (C) 2007-2008 Uwe Hermann <uwe@hermann-uwe.de> |
Keith Hui | 9aa45e6 | 2017-07-20 21:00:56 -0400 | [diff] [blame] | 5 | * Copyright (C) 2010,2017 Keith Hui <buurin@gmail.com> |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 16 | */ |
| 17 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 18 | #include <spd.h> |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 19 | #include <delay.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 20 | #include <stdint.h> |
Carl-Daniel Hailfinger | 2ee6779 | 2008-10-01 12:52:52 +0000 | [diff] [blame] | 21 | #include <stdlib.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 22 | #include <arch/io.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 23 | #include <device/pci_def.h> |
| 24 | #include <console/console.h> |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 25 | #include "i440bx.h" |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 26 | #include "raminit.h" |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 27 | |
Keith Hui | 9aa45e6 | 2017-07-20 21:00:56 -0400 | [diff] [blame] | 28 | /* |
| 29 | * Macros and definitions |
| 30 | */ |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 31 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 32 | /* Debugging macros. */ |
Martin Roth | 3323260 | 2017-06-24 14:48:50 -0600 | [diff] [blame] | 33 | #if IS_ENABLED(CONFIG_DEBUG_RAM_SETUP) |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 34 | #define PRINT_DEBUG(x...) printk(BIOS_DEBUG, x) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 35 | #define DUMPNORTH() dump_pci_device(NB) |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 36 | #else |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 37 | #define PRINT_DEBUG(x...) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 38 | #define DUMPNORTH() |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 39 | #endif |
| 40 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 41 | /* SDRAMC[7:5] - SDRAM Mode Select (SMS). */ |
| 42 | #define RAM_COMMAND_NORMAL 0x0 |
| 43 | #define RAM_COMMAND_NOP 0x1 |
| 44 | #define RAM_COMMAND_PRECHARGE 0x2 |
| 45 | #define RAM_COMMAND_MRS 0x3 |
| 46 | #define RAM_COMMAND_CBR 0x4 |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 47 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 48 | /* Map the JEDEC SPD refresh rates (array index) to 440BX refresh rates as |
| 49 | * defined in DRAMC[2:0]. |
| 50 | * |
| 51 | * [0] == Normal 15.625 us -> 15.6 us |
| 52 | * [1] == Reduced(.25X) 3.9 us -> 7.8 ns |
| 53 | * [2] == Reduced(.5X) 7.8 us -> 7.8 us |
| 54 | * [3] == Extended(2x) 31.3 us -> 31.2 us |
| 55 | * [4] == Extended(4x) 62.5 us -> 62.4 us |
| 56 | * [5] == Extended(8x) 125 us -> 124.8 us |
| 57 | */ |
| 58 | static const uint32_t refresh_rate_map[] = { |
| 59 | 1, 5, 5, 2, 3, 4 |
| 60 | }; |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 61 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 62 | /* Table format: register, bitmask, value. */ |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 63 | static const u8 register_values[] = { |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 64 | /* NBXCFG - NBX Configuration Register |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 65 | * 0x50 - 0x53 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 66 | * |
| 67 | * [31:24] SDRAM Row Without ECC |
| 68 | * 0 = ECC components are populated in this row |
| 69 | * 1 = ECC components are not populated in this row |
| 70 | * [23:19] Reserved |
| 71 | * [18:18] Host Bus Fast Data Ready Enable (HBFDRE) |
| 72 | * Assertion of DRAM data on host bus occurs... |
| 73 | * 0 = ...one clock after sampling snoop results (default) |
| 74 | * 1 = ...on the same clock the snoop result is being sampled |
| 75 | * (this mode is faster by one clock cycle) |
| 76 | * [17:17] ECC - EDO static Drive mode |
| 77 | * 0 = Normal mode (default) |
| 78 | * 1 = ECC signals are always driven |
| 79 | * [16:16] IDSEL_REDIRECT |
| 80 | * 0 = IDSEL1 is allocated to this bridge (default) |
| 81 | * 1 = IDSEL7 is allocated to this bridge |
| 82 | * [15:15] WSC# Handshake Disable |
| 83 | * 1 = Uni-processor mode |
| 84 | * 0 = Dual-processor mode with external IOAPIC (default) |
| 85 | * [14:14] Intel Reserved |
| 86 | * [13:12] Host/DRAM Frequency |
| 87 | * 00 = 100 MHz |
| 88 | * 01 = Reserved |
| 89 | * 10 = 66 MHz |
| 90 | * 11 = Reserved |
| 91 | * [11:11] AGP to PCI Access Enable |
| 92 | * 1 = Enable |
| 93 | * 0 = Disable |
| 94 | * [10:10] PCI Agent to Aperture Access Disable |
| 95 | * 1 = Disable |
| 96 | * 0 = Enable (default) |
| 97 | * [09:09] Aperture Access Global Enable |
| 98 | * 1 = Enable |
| 99 | * 0 = Disable |
| 100 | * [08:07] DRAM Data Integrity Mode (DDIM) |
| 101 | * 00 = Non-ECC |
| 102 | * 01 = EC-only |
| 103 | * 10 = ECC Mode |
| 104 | * 11 = ECC Mode with hardware scrubbing enabled |
| 105 | * [06:06] ECC Diagnostic Mode Enable (EDME) |
| 106 | * 1 = Enable |
| 107 | * 0 = Normal operation mode (default) |
| 108 | * [05:05] MDA Present (MDAP) |
| 109 | * Works in conjunction with the VGA_EN bit. |
| 110 | * VGA_EN MDAP |
| 111 | * 0 x All VGA cycles are sent to PCI |
| 112 | * 1 0 All VGA cycles are sent to AGP |
| 113 | * 1 1 All VGA cycles are sent to AGP, except for |
| 114 | * cycles in the MDA range. |
| 115 | * [04:04] Reserved |
| 116 | * [03:03] USWC Write Post During I/O Bridge Access Enable (UWPIO) |
| 117 | * 1 = Enable |
| 118 | * 0 = Disable |
| 119 | * [02:02] In-Order Queue Depth (IOQD) |
| 120 | * 1 = In-order queue = maximum |
| 121 | * 0 = A7# is sampled asserted (i.e., 0) |
| 122 | * [01:00] Reserved |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 123 | */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 124 | NBXCFG + 0, 0x00, 0x0c, |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 125 | // TODO: Bit 15 should be 0 for multiprocessor boards |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 126 | NBXCFG + 1, 0x00, 0x80, |
| 127 | NBXCFG + 2, 0x00, 0x00, |
| 128 | NBXCFG + 3, 0x00, 0xff, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 129 | |
| 130 | /* DRAMC - DRAM Control Register |
| 131 | * 0x57 |
| 132 | * |
| 133 | * [7:6] Reserved |
| 134 | * [5:5] Module Mode Configuration (MMCONFIG) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 135 | * The combination of SDRAMPWR and this bit (which is set by an |
| 136 | * external strapping option) determine how CKE works. |
| 137 | * SDRAMPWR MMCONFIG |
| 138 | * 0 0 = 3 DIMM, CKE0[5:0] driven |
| 139 | * X 1 = 3 DIMM, CKE0 only |
| 140 | * 1 0 = 4 DIMM, GCKE only |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 141 | * [4:3] DRAM Type (DT) |
| 142 | * 00 = EDO |
| 143 | * 01 = SDRAM |
| 144 | * 10 = Registered SDRAM |
| 145 | * 11 = Reserved |
| 146 | * Note: EDO, SDRAM and Registered SDRAM cannot be mixed. |
| 147 | * [2:0] DRAM Refresh Rate (DRR) |
| 148 | * 000 = Refresh disabled |
| 149 | * 001 = 15.6 us |
| 150 | * 010 = 31.2 us |
| 151 | * 011 = 62.4 us |
| 152 | * 100 = 124.8 us |
| 153 | * 101 = 249.6 us |
| 154 | * 110 = Reserved |
| 155 | * 111 = Reserved |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 156 | */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 157 | /* Choose SDRAM (not registered), and disable refresh for now. */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 158 | DRAMC, 0x00, 0x08, |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 159 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 160 | /* |
| 161 | * PAM[6:0] - Programmable Attribute Map Registers |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 162 | * 0x59 - 0x5f |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 163 | * |
| 164 | * 0x59 [3:0] Reserved |
| 165 | * 0x59 [5:4] 0xF0000 - 0xFFFFF BIOS area |
| 166 | * 0x5a [1:0] 0xC0000 - 0xC3FFF ISA add-on BIOS |
| 167 | * 0x5a [5:4] 0xC4000 - 0xC7FFF ISA add-on BIOS |
| 168 | * 0x5b [1:0] 0xC8000 - 0xCBFFF ISA add-on BIOS |
| 169 | * 0x5b [5:4] 0xCC000 - 0xCFFFF ISA add-on BIOS |
| 170 | * 0x5c [1:0] 0xD0000 - 0xD3FFF ISA add-on BIOS |
| 171 | * 0x5c [5:4] 0xD4000 - 0xD7FFF ISA add-on BIOS |
| 172 | * 0x5d [1:0] 0xD8000 - 0xDBFFF ISA add-on BIOS |
| 173 | * 0x5d [5:4] 0xDC000 - 0xDFFFF ISA add-on BIOS |
Martin Roth | 128c104 | 2016-11-18 09:29:03 -0700 | [diff] [blame] | 174 | * 0x5e [1:0] 0xE0000 - 0xE3FFF BIOS extension |
| 175 | * 0x5e [5:4] 0xE4000 - 0xE7FFF BIOS extension |
| 176 | * 0x5f [1:0] 0xE8000 - 0xEBFFF BIOS extension |
| 177 | * 0x5f [5:4] 0xEC000 - 0xEFFFF BIOS extension |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 178 | * |
| 179 | * Bit assignment: |
| 180 | * 00 = DRAM Disabled (all access goes to memory mapped I/O space) |
| 181 | * 01 = Read Only (Reads to DRAM, writes to memory mapped I/O space) |
| 182 | * 10 = Write Only (Writes to DRAM, reads to memory mapped I/O space) |
| 183 | * 11 = Read/Write (all access goes to DRAM) |
| 184 | */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 185 | |
| 186 | /* |
| 187 | * Map all legacy regions to RAM (read/write). This is required if |
| 188 | * you want to use the RAM area from 768 KB - 1 MB. If the PAM |
| 189 | * registers are not set here appropriately, the RAM in that region |
| 190 | * will not be accessible, thus a RAM check of it will also fail. |
| 191 | * |
| 192 | * TODO: This was set in sdram_set_spd_registers(). |
| 193 | * Test if it still works when set here. |
| 194 | */ |
| 195 | PAM0, 0x00, 0x30, |
| 196 | PAM1, 0x00, 0x33, |
| 197 | PAM2, 0x00, 0x33, |
| 198 | PAM3, 0x00, 0x33, |
| 199 | PAM4, 0x00, 0x33, |
| 200 | PAM5, 0x00, 0x33, |
| 201 | PAM6, 0x00, 0x33, |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 202 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 203 | /* DRB[0:7] - DRAM Row Boundary Registers |
| 204 | * 0x60 - 0x67 |
| 205 | * |
| 206 | * An array of 8 byte registers, which hold the ending memory address |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 207 | * assigned to each pair of DIMMs, in 8MB granularity. |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 208 | * |
| 209 | * 0x60 DRB0 = Total memory in row0 (in 8 MB) |
| 210 | * 0x61 DRB1 = Total memory in row0+1 (in 8 MB) |
| 211 | * 0x62 DRB2 = Total memory in row0+1+2 (in 8 MB) |
| 212 | * 0x63 DRB3 = Total memory in row0+1+2+3 (in 8 MB) |
| 213 | * 0x64 DRB4 = Total memory in row0+1+2+3+4 (in 8 MB) |
| 214 | * 0x65 DRB5 = Total memory in row0+1+2+3+4+5 (in 8 MB) |
| 215 | * 0x66 DRB6 = Total memory in row0+1+2+3+4+5+6 (in 8 MB) |
| 216 | * 0x67 DRB7 = Total memory in row0+1+2+3+4+5+6+7 (in 8 MB) |
| 217 | */ |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 218 | /* Set the DRBs to zero for now, this will be fixed later. */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 219 | DRB0, 0x00, 0x00, |
| 220 | DRB1, 0x00, 0x00, |
| 221 | DRB2, 0x00, 0x00, |
| 222 | DRB3, 0x00, 0x00, |
| 223 | DRB4, 0x00, 0x00, |
| 224 | DRB5, 0x00, 0x00, |
| 225 | DRB6, 0x00, 0x00, |
| 226 | DRB7, 0x00, 0x00, |
| 227 | |
| 228 | /* FDHC - Fixed DRAM Hole Control Register |
| 229 | * 0x68 |
| 230 | * |
| 231 | * Controls two fixed DRAM holes: 512 KB - 640 KB and 15 MB - 16 MB. |
| 232 | * |
| 233 | * [7:6] Hole Enable (HEN) |
| 234 | * 00 = None |
| 235 | * 01 = 512 KB - 640 KB (128 KB) |
| 236 | * 10 = 15 MB - 16 MB (1 MB) |
| 237 | * 11 = Reserved |
| 238 | * [5:0] Reserved |
| 239 | */ |
| 240 | /* No memory holes. */ |
| 241 | FDHC, 0x00, 0x00, |
| 242 | |
| 243 | /* RPS - SDRAM Row Page Size Register |
| 244 | * 0x74 - 0x75 |
| 245 | * |
| 246 | * Sets the row page size for SDRAM. For EDO memory, the page |
| 247 | * size is fixed at 2 KB. |
| 248 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 249 | * Bits[1:0] Page Size |
| 250 | * 00 2 KB |
| 251 | * 01 4 KB |
| 252 | * 10 8 KB |
| 253 | * 11 Reserved |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 254 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 255 | * RPS bits Corresponding DRB register |
| 256 | * [01:00] DRB[0], row 0 |
| 257 | * [03:02] DRB[1], row 1 |
| 258 | * [05:04] DRB[2], row 2 |
| 259 | * [07:06] DRB[3], row 3 |
| 260 | * [09:08] DRB[4], row 4 |
| 261 | * [11:10] DRB[5], row 5 |
| 262 | * [13:12] DRB[6], row 6 |
| 263 | * [15:14] DRB[7], row 7 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 264 | */ |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 265 | /* Power on defaults to 2KB. Will be set later. */ |
| 266 | // RPS + 0, 0x00, 0x00, |
| 267 | // RPS + 1, 0x00, 0x00, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 268 | |
| 269 | /* SDRAMC - SDRAM Control Register |
Uwe Hermann | 7ea18cf | 2007-05-04 00:51:17 +0000 | [diff] [blame] | 270 | * 0x76 - 0x77 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 271 | * |
| 272 | * [15:10] Reserved |
| 273 | * [09:08] Idle/Pipeline DRAM Leadoff Timing (IPDLT) |
| 274 | * 00 = Illegal |
| 275 | * 01 = Add a clock delay to the lead-off clock count |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 276 | * 1x = Illegal |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 277 | * [07:05] SDRAM Mode Select (SMS) |
| 278 | * 000 = Normal SDRAM Operation (default) |
| 279 | * 001 = NOP Command Enable |
| 280 | * 010 = All Banks Precharge Enable |
| 281 | * 011 = Mode Register Set Enable |
| 282 | * 100 = CBR Enable |
| 283 | * 101 = Reserved |
| 284 | * 110 = Reserved |
| 285 | * 111 = Reserved |
| 286 | * [04:04] SDRAMPWR |
| 287 | * 0 = 3 DIMM configuration |
| 288 | * 1 = 4 DIMM configuration |
| 289 | * [03:03] Leadoff Command Timing (LCT) |
| 290 | * 0 = 4 CS# Clock |
| 291 | * 1 = 3 CS# Clock |
| 292 | * [02:02] CAS# Latency (CL) |
| 293 | * 0 = 3 DCLK CAS# latency |
| 294 | * 1 = 2 DCLK CAS# latency |
| 295 | * [01:01] SDRAM RAS# to CAS# Delay (SRCD) |
| 296 | * 0 = 3 clocks between a row activate and a read or write cmd. |
| 297 | * 1 = 2 clocks between a row activate and a read or write cmd. |
| 298 | * [00:00] SDRAM RAS# Precharge (SRP) |
| 299 | * 0 = 3 clocks of RAS# precharge |
| 300 | * 1 = 2 clocks of RAS# precharge |
| 301 | */ |
Martin Roth | 3323260 | 2017-06-24 14:48:50 -0600 | [diff] [blame] | 302 | #if IS_ENABLED(CONFIG_SDRAMPWR_4DIMM) |
Keith Hui | 9c1e1f0 | 2010-03-13 20:16:48 +0000 | [diff] [blame] | 303 | SDRAMC + 0, 0x00, 0x10, /* The board has 4 DIMM slots. */ |
| 304 | #else |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 305 | SDRAMC + 0, 0x00, 0x00, /* The board has 3 DIMM slots. */ |
Keith Hui | 9c1e1f0 | 2010-03-13 20:16:48 +0000 | [diff] [blame] | 306 | #endif |
Mats Erik Andersson | 45db366 | 2008-09-30 04:52:29 +0000 | [diff] [blame] | 307 | SDRAMC + 1, 0x00, 0x00, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 308 | |
| 309 | /* PGPOL - Paging Policy Register |
| 310 | * 0x78 - 0x79 |
| 311 | * |
| 312 | * [15:08] Banks per Row (BPR) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 313 | * Each bit in this field corresponds to one row of the memory |
| 314 | * array. Bit 15 corresponds to row 7 while bit 8 corresponds |
| 315 | * to row 0. Bits for empty rows are "don't care". |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 316 | * 0 = 2 banks |
| 317 | * 1 = 4 banks |
| 318 | * [07:05] Reserved |
| 319 | * [04:04] Intel Reserved |
| 320 | * [03:00] DRAM Idle Timer (DIT) |
| 321 | * 0000 = 0 clocks |
| 322 | * 0001 = 2 clocks |
| 323 | * 0010 = 4 clocks |
| 324 | * 0011 = 8 clocks |
| 325 | * 0100 = 10 clocks |
| 326 | * 0101 = 12 clocks |
| 327 | * 0110 = 16 clocks |
| 328 | * 0111 = 32 clocks |
| 329 | * 1xxx = Infinite (pages are not closed for idle condition) |
| 330 | */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 331 | PGPOL + 0, 0x00, 0x00, |
| 332 | PGPOL + 1, 0x00, 0xff, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 333 | |
| 334 | /* PMCR - Power Management Control Register |
| 335 | * 0x7a |
| 336 | * |
| 337 | * [07:07] Power Down SDRAM Enable (PDSE) |
| 338 | * 1 = Enable |
| 339 | * 0 = Disable |
| 340 | * [06:06] ACPI Control Register Enable (SCRE) |
| 341 | * 1 = Enable |
| 342 | * 0 = Disable (default) |
| 343 | * [05:05] Suspend Refresh Type (SRT) |
| 344 | * 1 = Self refresh mode |
| 345 | * 0 = CBR fresh mode |
| 346 | * [04:04] Normal Refresh Enable (NREF_EN) |
| 347 | * 1 = Enable |
| 348 | * 0 = Disable |
| 349 | * [03:03] Quick Start Mode (QSTART) |
| 350 | * 1 = Quick start mode for the processor is enabled |
| 351 | * [02:02] Gated Clock Enable (GCLKEN) |
| 352 | * 1 = Enable |
| 353 | * 0 = Disable |
| 354 | * [01:01] AGP Disable (AGP_DIS) |
| 355 | * 1 = Disable |
| 356 | * 0 = Enable |
| 357 | * [00:00] CPU reset without PCIRST enable (CRst_En) |
| 358 | * 1 = Enable |
| 359 | * 0 = Disable |
| 360 | */ |
| 361 | /* Enable normal refresh and the gated clock. */ |
| 362 | // TODO: Only do this later? |
| 363 | // PMCR, 0x00, 0x14, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 364 | PMCR, 0x00, 0x00, |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 365 | |
| 366 | /* Enable SCRR.SRRAEN and let BX choose the SRR. */ |
| 367 | SCRR + 1, 0x00, 0x10, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 368 | }; |
| 369 | |
| 370 | /*----------------------------------------------------------------------------- |
| 371 | SDRAM configuration functions. |
| 372 | -----------------------------------------------------------------------------*/ |
| 373 | |
| 374 | /** |
| 375 | * Send the specified RAM command to all DIMMs. |
| 376 | * |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 377 | * @param command The RAM command to send to the DIMM(s). |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 378 | */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 379 | static void do_ram_command(u32 command) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 380 | { |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 381 | int i, caslatency; |
| 382 | u8 dimm_start, dimm_end; |
| 383 | u16 reg16; |
Kevin Paul Herbert | bde6d30 | 2014-12-24 18:43:20 -0800 | [diff] [blame] | 384 | void *addr; |
| 385 | u32 addr_offset; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 386 | |
| 387 | /* Configure the RAM command. */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 388 | reg16 = pci_read_config16(NB, SDRAMC); |
| 389 | reg16 &= 0xff1f; /* Clear bits 7-5. */ |
| 390 | reg16 |= (u16) (command << 5); /* Write command into bits 7-5. */ |
| 391 | pci_write_config16(NB, SDRAMC, reg16); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 392 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 393 | /* |
| 394 | * RAM_COMMAND_NORMAL affects only the memory controller and |
| 395 | * doesn't need to be "sent" to the DIMMs. |
| 396 | */ |
| 397 | if (command == RAM_COMMAND_NORMAL) |
| 398 | return; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 399 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 400 | /* Send the RAM command to each row of memory. */ |
| 401 | dimm_start = 0; |
| 402 | for (i = 0; i < (DIMM_SOCKETS * 2); i++) { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 403 | addr_offset = 0; |
| 404 | caslatency = 3; /* TODO: Dynamically get CAS latency later. */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 405 | if (command == RAM_COMMAND_MRS) { |
| 406 | /* |
| 407 | * MAA[12:11,9:0] must be inverted when sent to DIMM |
| 408 | * 2 or 3 (no inversion if sent to DIMM 0 or 1). |
| 409 | */ |
| 410 | if ((i >= 0 && i <= 3) && caslatency == 3) |
| 411 | addr_offset = 0x1d0; |
| 412 | if ((i >= 4 && i <= 7) && caslatency == 3) |
| 413 | addr_offset = 0x1e28; |
| 414 | if ((i >= 0 && i <= 3) && caslatency == 2) |
| 415 | addr_offset = 0x150; |
| 416 | if ((i >= 4 && i <= 7) && caslatency == 2) |
| 417 | addr_offset = 0x1ea8; |
| 418 | } |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 419 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 420 | dimm_end = pci_read_config8(NB, DRB + i); |
| 421 | |
Kevin Paul Herbert | bde6d30 | 2014-12-24 18:43:20 -0800 | [diff] [blame] | 422 | addr = (void *)((dimm_start * 8 * 1024 * 1024) + addr_offset); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 423 | if (dimm_end > dimm_start) { |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 424 | read32(addr); |
| 425 | } |
| 426 | |
| 427 | /* Set the start of the next DIMM. */ |
| 428 | dimm_start = dimm_end; |
| 429 | } |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 430 | } |
| 431 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 432 | static void set_dram_buffer_strength(void) |
| 433 | { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 434 | /* To give some breathing room for romcc, |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 435 | * mbsc0 doubles as drb |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 436 | * mbsc1 doubles as drb1 |
| 437 | * mbfs0 doubles as i and reg |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 438 | */ |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 439 | uint8_t mbsc0,mbsc1,mbsc3,mbsc4,mbfs0,mbfs2,fsb; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 440 | |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 441 | /* Tally how many rows between rows 0-3 and rows 4-7 are populated. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 442 | * This determines how to program MBFS and MBSC. |
| 443 | */ |
| 444 | uint8_t dimm03 = 0; |
| 445 | uint8_t dimm47 = 0; |
| 446 | |
| 447 | mbsc0 = 0; |
| 448 | for (mbfs0 = DRB0; mbfs0 <= DRB7; mbfs0++) { |
| 449 | mbsc1 = pci_read_config8(NB, mbfs0); |
| 450 | if (mbsc0 != mbsc1) { |
| 451 | if (mbfs0 <= DRB3) { |
| 452 | dimm03++; |
| 453 | } else { |
| 454 | dimm47++; |
| 455 | } |
| 456 | mbsc0 = mbsc1; |
| 457 | } |
| 458 | } |
| 459 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 460 | /* Algorithm bitmap for programming MBSC[39:0] and MBFS[23:0]. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 461 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 462 | * The 440BX datasheet says buffer frequency is independent from bus |
| 463 | * frequency and mismatch both ways are possible. This is how it is |
| 464 | * programmed in the ASUS P2B-LS mainboard. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 465 | * |
| 466 | * There are four main conditions to check when programming DRAM buffer |
| 467 | * frequency and strength: |
| 468 | * |
| 469 | * a: >2 rows populated across DIMM0,1 |
| 470 | * b: >2 rows populated across DIMM2,3 |
| 471 | * c: >4 rows populated across all DIMM slots |
| 472 | * and either one of: |
| 473 | * 1: NBXCFG[13] strapped as 100MHz, or |
| 474 | * 6: NBXCFG[13] strapped as 66MHz |
| 475 | * |
| 476 | * CKE0/FENA ----------------------------------------------------------+ |
| 477 | * CKE1/GCKE -------------------[ MBFS ]------------------------+| |
| 478 | * DQMA/CASA[764320]# ----------[ 0 = 66MHz ]-----------------------+|| |
| 479 | * DQMB1/CASB1# ----------------[ 1 = 100MHz ]----------------------+||| |
| 480 | * DQMB5/CASB5# ---------------------------------------------------+|||| |
| 481 | * DQMA1/CASA1# --------------------------------------------------+||||| |
| 482 | * DQMA5/CASA5# -------------------------------------------------+|||||| |
| 483 | * CSA0-5#,CSB0-5# ----------------------------------------++++++||||||| |
| 484 | * CSA6#/CKE2# -------------------------------------------+||||||||||||| |
| 485 | * CSB6#/CKE4# ------------------------------------------+|||||||||||||| |
| 486 | * CSA7#/CKE3# -----------------------------------------+||||||||||||||| |
| 487 | * CSB7#/CKE5# ----------------------------------------+|||||||||||||||| |
| 488 | * MECC[7:0] #2/#1 (100MHz) -------------------------++||||||||||||||||| |
| 489 | * MD[63:0] #2/#1 (100MHz) ------------------------++||||||||||||||||||| |
| 490 | * MAB[12:11,9:0]#,MAB[13,10],WEB#,SRASB#,SCASB# -+||||||||||||||||||||| |
| 491 | * MAA[13:0],WEA#,SRASA#,SCASA# -----------------+|||||||||||||||||||||| |
| 492 | * Reserved ------------------------------------+||||||||||||||||||||||| |
| 493 | * |||||||||||||||||||||||| |
| 494 | * 3 32 21 10 0 * 2 21 10 0 |
| 495 | * 9876543210987654321098765432109876543210 * 321098765432109876543210 |
| 496 | * a 10------------------------1010---------- * -1---------------11----- a |
| 497 | *!a 11------------------------1111---------- * -0---------------00----- !a |
| 498 | * b --10--------------------------1010------ * --1----------------11--- b |
| 499 | *!b --11--------------------------1111------ * --0----------------00--- !b |
| 500 | * c ----------------------------------1100-- * ----------------------1- c |
| 501 | *!c ----------------------------------1011-- * ----------------------0- !c |
| 502 | * 1 ----1010101000000000000000------------00 * ---11111111111111----1-0 1 |
| 503 | * 6 ----000000000000000000000010101010----00 * ---1111111111111100000-0 6 |
| 504 | * | | | | | | | | | | ||||||| | | | | | | |
| 505 | * | | | | | | | | | | ||||||| | | | | | +- CKE0/FENA |
| 506 | * | | | | | | | | | | ||||||| | | | | +--- CKE1/GCKE |
| 507 | * | | | | | | | | | | ||||||| | | | +----- DQMA/CASA[764320]# |
| 508 | * | | | | | | | | | | ||||||| | | +------- DQMB1/CASB1# |
| 509 | * | | | | | | | | | | ||||||| | +--------- DQMB5/CASB5# |
| 510 | * | | | | | | | | | | ||||||| +----------- DQMA1/CASA1# |
| 511 | * | | | | | | | | | | ||||||+------------- DQMA5/CASA5# |
| 512 | * | | | | | | | | | | ++++++-------------- CSA0-5#,CSB0-5# [ 0=1x;1=2x ] |
| 513 | * | | | | | | | | | +--------------------- CSA6#/CKE2# |
| 514 | * | | | | | | | | +---[ MBSC ]------ CSB6#/CKE4# |
| 515 | * | | | | | | | +-----[ 00 = 1x ]------ CSA7#/CKE3# |
| 516 | * | | | | | | +-------[ 01 invalid ]------ CSB7#/CKE5# |
| 517 | * | | | | | +---------[ 10 = 2x ]------ MECC[7:0] #1 (2x) |
| 518 | * | | | | +-----------[ 11 = 3x ]------ MECC[7:0] #2 (2x) |
| 519 | * | | | +--------------------------------- MD[63:0] #1 (2x) |
| 520 | * | | +----------------------------------- MD[63:0] #2 (2x) |
| 521 | * | +------------------------------------- MAB[12:11,9:0]#,MAB[13,10],WEB#,SRASB#,SCASB# |
| 522 | * +--------------------------------------- MAA[13:0],WEA#,SRASA#,SCASA# |
| 523 | * MBSC[47:40] and MBFS[23] are reserved. |
| 524 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 525 | * This algorithm is checked against the ASUS P2B-LS (which has |
| 526 | * 4 DIMM slots) factory BIOS. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 527 | * Therefore it assumes a board with 4 slots, and will need testing |
| 528 | * on boards with 3 DIMM slots. |
| 529 | */ |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 530 | |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 531 | mbsc0 = 0x80; |
| 532 | mbsc1 = 0x2a; |
| 533 | mbfs2 = 0x1f; |
| 534 | if (pci_read_config8(NB, NBXCFG + 1) & 0x30) { |
| 535 | fsb = 66; |
| 536 | mbsc3 = 0x00; |
| 537 | mbsc4 = 0x00; |
| 538 | mbfs0 = 0x80; |
| 539 | } else { |
| 540 | fsb = 100; |
| 541 | mbsc3 = 0xa0; |
| 542 | mbsc4 = 0x0a; |
| 543 | mbfs0 = 0x84; |
| 544 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 545 | |
| 546 | if (dimm03 > 2) { |
| 547 | mbsc4 = mbsc4 | 0x80; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 548 | mbsc1 = mbsc1 | 0x28; |
| 549 | mbfs2 = mbfs2 | 0x40; |
| 550 | mbfs0 = mbfs0 | 0x60; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 551 | } else { |
| 552 | mbsc4 = mbsc4 | 0xc0; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 553 | if (fsb == 100) { |
| 554 | mbsc1 = mbsc1 | 0x3c; |
| 555 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 556 | } |
| 557 | if (dimm47 > 2) { |
| 558 | mbsc4 = mbsc4 | 0x20; |
| 559 | mbsc1 = mbsc1 | 0x02; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 560 | mbsc0 = mbsc0 | 0x80; |
| 561 | mbfs2 = mbfs2 | 0x20; |
| 562 | mbfs0 = mbfs0 | 0x18; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 563 | } else { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 564 | mbsc4 = mbsc4 | 0x30; |
| 565 | if (fsb == 100) { |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 566 | mbsc1 = mbsc1 | 0x03; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 567 | mbsc0 = mbsc0 | 0xc0; |
| 568 | } |
| 569 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 570 | if ((dimm03 + dimm47) > 4) { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 571 | mbsc0 = mbsc0 | 0x30; |
| 572 | mbfs0 = mbfs0 | 0x02; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 573 | } else { |
| 574 | mbsc0 = mbsc0 | 0x2c; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | pci_write_config8(NB, MBSC + 0, mbsc0); |
| 578 | pci_write_config8(NB, MBSC + 1, mbsc1); |
| 579 | pci_write_config8(NB, MBSC + 2, 0x00); |
| 580 | pci_write_config8(NB, MBSC + 3, mbsc3); |
| 581 | pci_write_config8(NB, MBSC + 4, mbsc4); |
| 582 | pci_write_config8(NB, MBFS + 0, mbfs0); |
| 583 | pci_write_config8(NB, MBFS + 1, 0xff); |
| 584 | pci_write_config8(NB, MBFS + 2, mbfs2); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 585 | } |
| 586 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 587 | /*----------------------------------------------------------------------------- |
Martin Roth | 128c104 | 2016-11-18 09:29:03 -0700 | [diff] [blame] | 588 | DIMM-independent configuration functions. |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 589 | -----------------------------------------------------------------------------*/ |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 590 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 591 | static void spd_enable_refresh(void) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 592 | { |
| 593 | int i, value; |
| 594 | uint8_t reg; |
| 595 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 596 | reg = pci_read_config8(NB, DRAMC); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 597 | |
| 598 | for (i = 0; i < DIMM_SOCKETS; i++) { |
Uwe Hermann | d773fd3 | 2010-11-20 20:23:08 +0000 | [diff] [blame] | 599 | value = spd_read_byte(DIMM0 + i, SPD_REFRESH); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 600 | if (value < 0) |
| 601 | continue; |
| 602 | reg = (reg & 0xf8) | refresh_rate_map[(value & 0x7f)]; |
| 603 | |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 604 | PRINT_DEBUG(" Enabling refresh (DRAMC = 0x%02x) for DIMM %02x\n", reg, i); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 605 | } |
| 606 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 607 | pci_write_config8(NB, DRAMC, reg); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 608 | } |
| 609 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 610 | /*----------------------------------------------------------------------------- |
| 611 | Public interface. |
| 612 | -----------------------------------------------------------------------------*/ |
| 613 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 614 | void sdram_set_registers(void) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 615 | { |
| 616 | int i, max; |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 617 | uint8_t reg; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 618 | |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 619 | PRINT_DEBUG("Northbridge prior to SDRAM init:\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 620 | DUMPNORTH(); |
| 621 | |
Carl-Daniel Hailfinger | 2ee6779 | 2008-10-01 12:52:52 +0000 | [diff] [blame] | 622 | max = ARRAY_SIZE(register_values); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 623 | |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 624 | /* Set registers as specified in the register_values[] array. */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 625 | for (i = 0; i < max; i += 3) { |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 626 | reg = pci_read_config8(NB, register_values[i]); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 627 | reg &= register_values[i + 1]; |
| 628 | reg |= register_values[i + 2] & ~(register_values[i + 1]); |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 629 | pci_write_config8(NB, register_values[i], reg); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 630 | } |
| 631 | } |
| 632 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 633 | struct dimm_size { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 634 | u32 side1; |
| 635 | u32 side2; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 636 | }; |
| 637 | |
| 638 | static struct dimm_size spd_get_dimm_size(unsigned int device) |
| 639 | { |
| 640 | struct dimm_size sz; |
| 641 | int i, module_density, dimm_banks; |
| 642 | sz.side1 = 0; |
| 643 | module_density = spd_read_byte(device, SPD_DENSITY_OF_EACH_ROW_ON_MODULE); |
| 644 | dimm_banks = spd_read_byte(device, SPD_NUM_DIMM_BANKS); |
| 645 | |
| 646 | /* Find the size of side1. */ |
| 647 | /* Find the larger value. The larger value is always side1. */ |
| 648 | for (i = 512; i >= 0; i >>= 1) { |
| 649 | if ((module_density & i) == i) { |
| 650 | sz.side1 = i; |
| 651 | break; |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | /* Set to 0 in case it's single sided. */ |
| 656 | sz.side2 = 0; |
| 657 | |
| 658 | /* Test if it's a dual-sided DIMM. */ |
| 659 | if (dimm_banks > 1) { |
| 660 | /* Test if there's a second value. If so it's asymmetrical. */ |
| 661 | if (module_density != i) { |
| 662 | /* |
| 663 | * Find second value, picking up where we left off. |
| 664 | * i >>= 1 done initially to make sure we don't get |
| 665 | * the same value again. |
| 666 | */ |
| 667 | for (i >>= 1; i >= 0; i >>= 1) { |
| 668 | if (module_density == (sz.side1 | i)) { |
| 669 | sz.side2 = i; |
| 670 | break; |
| 671 | } |
| 672 | } |
| 673 | /* If not, it's symmetrical. */ |
| 674 | } else { |
| 675 | sz.side2 = sz.side1; |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | /* |
| 680 | * SPD byte 31 is the memory size divided by 4 so we |
Martin Roth | 128c104 | 2016-11-18 09:29:03 -0700 | [diff] [blame] | 681 | * need to multiply by 4 to get the total size. |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 682 | */ |
| 683 | sz.side1 *= 4; |
| 684 | sz.side2 *= 4; |
| 685 | |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 686 | /* It is possible to partially use larger then supported |
| 687 | * modules by setting them to a supported size. |
| 688 | */ |
Elyes HAOUAS | 12df950 | 2016-08-23 21:29:48 +0200 | [diff] [blame] | 689 | if (sz.side1 > 128) { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 690 | PRINT_DEBUG("Side1 was %dMB but only 128MB will be used.\n", |
| 691 | sz.side1); |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 692 | sz.side1 = 128; |
| 693 | |
Elyes HAOUAS | 12df950 | 2016-08-23 21:29:48 +0200 | [diff] [blame] | 694 | if (sz.side2 > 128) { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 695 | PRINT_DEBUG("Side2 was %dMB but only 128MB will be used.\n", |
| 696 | sz.side2); |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 697 | sz.side2 = 128; |
| 698 | } |
| 699 | } |
| 700 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 701 | return sz; |
| 702 | } |
| 703 | /* |
| 704 | * Sets DRAM attributes one DIMM at a time, based on SPD data. |
| 705 | * Northbridge settings that are set: NBXCFG[31:24], DRB0-DRB7, RPS, DRAMC. |
| 706 | */ |
| 707 | static void set_dram_row_attributes(void) |
| 708 | { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 709 | int i, dra, drb, col, width, value, rps; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 710 | u8 bpr; /* Top 8 bits of PGPOL */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 711 | u8 nbxecc = 0; /* NBXCFG[31:24] */ |
| 712 | u8 edo, sd, regsd; /* EDO, SDRAM, registered SDRAM */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 713 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 714 | edo = 0; |
| 715 | sd = 0; |
| 716 | regsd = 1; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 717 | rps = 0; |
| 718 | drb = 0; |
| 719 | bpr = 0; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 720 | |
| 721 | for (i = 0; i < DIMM_SOCKETS; i++) { |
| 722 | unsigned int device; |
Uwe Hermann | d773fd3 | 2010-11-20 20:23:08 +0000 | [diff] [blame] | 723 | device = DIMM0 + i; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 724 | bpr >>= 2; |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 725 | nbxecc >>= 2; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 726 | |
| 727 | /* First check if a DIMM is actually present. */ |
| 728 | value = spd_read_byte(device, SPD_MEMORY_TYPE); |
| 729 | /* This is 440BX! We do EDO too! */ |
| 730 | if (value == SPD_MEMORY_TYPE_EDO |
| 731 | || value == SPD_MEMORY_TYPE_SDRAM) { |
| 732 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 733 | if (value == SPD_MEMORY_TYPE_EDO) { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 734 | edo = 1; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 735 | } else if (value == SPD_MEMORY_TYPE_SDRAM) { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 736 | sd = 1; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 737 | } |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 738 | PRINT_DEBUG("Found DIMM in slot %d\n", i); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 739 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 740 | if (edo && sd) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 741 | printk(BIOS_ERR, "Mixing EDO/SDRAM unsupported!\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 742 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | /* "DRA" is our RPS for the two rows on this DIMM. */ |
| 746 | dra = 0; |
| 747 | |
| 748 | /* Columns */ |
| 749 | col = spd_read_byte(device, SPD_NUM_COLUMNS); |
| 750 | |
| 751 | /* |
| 752 | * Is this an ECC DIMM? Actually will be a 2 if so. |
| 753 | * TODO: Other register than NBXCFG also needs this |
| 754 | * ECC information. |
| 755 | */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 756 | value = spd_read_byte(device, SPD_DIMM_CONFIG_TYPE); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 757 | |
| 758 | /* Data width */ |
| 759 | width = spd_read_byte(device, SPD_MODULE_DATA_WIDTH_LSB); |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 760 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 761 | /* Exclude error checking data width from page size calculations */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 762 | if (value) { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 763 | value = spd_read_byte(device, |
| 764 | SPD_ERROR_CHECKING_SDRAM_WIDTH); |
| 765 | width -= value; |
| 766 | /* ### ECC */ |
| 767 | /* Clear top 2 bits to help set up NBXCFG. */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 768 | nbxecc &= 0x3f; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 769 | } else { |
| 770 | /* Without ECC, top 2 bits should be 11. */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 771 | nbxecc |= 0xc0; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 772 | } |
| 773 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 774 | /* If any installed DIMM is *not* registered, this system cannot be |
| 775 | * configured for registered SDRAM. |
| 776 | * By registered, only the address and control lines need to be, which |
| 777 | * we can tell by reading SPD byte 21, bit 1. |
| 778 | */ |
| 779 | value = spd_read_byte(device, SPD_MODULE_ATTRIBUTES); |
| 780 | |
| 781 | PRINT_DEBUG("DIMM is "); |
| 782 | if ((value & MODULE_REGISTERED) == 0) { |
| 783 | regsd = 0; |
| 784 | PRINT_DEBUG("not "); |
| 785 | } |
| 786 | PRINT_DEBUG("registered\n"); |
| 787 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 788 | /* Calculate page size in bits. */ |
| 789 | value = ((1 << col) * width); |
| 790 | |
| 791 | /* Convert to KB. */ |
| 792 | dra = (value >> 13); |
| 793 | |
| 794 | /* Number of banks of DIMM (single or double sided). */ |
| 795 | value = spd_read_byte(device, SPD_NUM_DIMM_BANKS); |
| 796 | |
| 797 | /* Once we have dra, col is done and can be reused. |
| 798 | * So it's reused for number of banks. |
| 799 | */ |
| 800 | col = spd_read_byte(device, SPD_NUM_BANKS_PER_SDRAM); |
| 801 | |
| 802 | if (value == 1) { |
| 803 | /* |
| 804 | * Second bank of 1-bank DIMMs "doesn't have |
| 805 | * ECC" - or anything. |
| 806 | */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 807 | if (dra == 2) { |
| 808 | dra = 0x0; /* 2KB */ |
| 809 | } else if (dra == 4) { |
| 810 | dra = 0x1; /* 4KB */ |
| 811 | } else if (dra == 8) { |
| 812 | dra = 0x2; /* 8KB */ |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 813 | } else if (dra >= 16) { |
| 814 | /* Page sizes larger than supported are |
| 815 | * set to 8KB to use module partially. |
| 816 | */ |
| 817 | PRINT_DEBUG("Page size forced to 8KB.\n"); |
| 818 | dra = 0x2; /* 8KB */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 819 | } else { |
| 820 | dra = -1; |
| 821 | } |
| 822 | /* |
| 823 | * Sets a flag in PGPOL[BPR] if this DIMM has |
| 824 | * 4 banks per row. |
| 825 | */ |
| 826 | if (col == 4) |
| 827 | bpr |= 0x40; |
| 828 | } else if (value == 2) { |
| 829 | if (dra == 2) { |
| 830 | dra = 0x0; /* 2KB */ |
| 831 | } else if (dra == 4) { |
| 832 | dra = 0x05; /* 4KB */ |
| 833 | } else if (dra == 8) { |
| 834 | dra = 0x0a; /* 8KB */ |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 835 | } else if (dra >= 16) { |
| 836 | /* Ditto */ |
| 837 | PRINT_DEBUG("Page size forced to 8KB.\n"); |
| 838 | dra = 0x0a; /* 8KB */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 839 | } else { |
| 840 | dra = -1; |
| 841 | } |
| 842 | /* Ditto */ |
| 843 | if (col == 4) |
| 844 | bpr |= 0xc0; |
| 845 | } else { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 846 | printk(BIOS_ERR, "# of banks of DIMM unsupported!\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 847 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 848 | } |
| 849 | if (dra == -1) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 850 | printk(BIOS_ERR, "Page size not supported\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 851 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | /* |
| 855 | * 440BX supports asymmetrical dual-sided DIMMs, |
| 856 | * but can't handle DIMMs smaller than 8MB per |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 857 | * side. |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 858 | */ |
| 859 | struct dimm_size sz = spd_get_dimm_size(device); |
| 860 | if ((sz.side1 < 8)) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 861 | printk(BIOS_ERR, "DIMMs smaller than 8MB per side\n" |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 862 | "are not supported on this NB.\n"); |
| 863 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 864 | } |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 865 | |
| 866 | /* Divide size by 8 to set up the DRB registers. */ |
| 867 | drb += (sz.side1 / 8); |
| 868 | |
| 869 | /* |
| 870 | * Build the DRB for the next row in MSB so it gets |
| 871 | * placed in DRB[n+1] where it belongs when written |
| 872 | * as a 16-bit word. |
| 873 | */ |
| 874 | drb &= 0xff; |
| 875 | drb |= (drb + (sz.side2 / 8)) << 8; |
| 876 | } else { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 877 | /* If there's no DIMM in the slot, set dra to 0x00. */ |
| 878 | dra = 0x00; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 879 | /* Still have to propagate DRB over. */ |
| 880 | drb &= 0xff; |
| 881 | drb |= (drb << 8); |
| 882 | } |
| 883 | |
| 884 | pci_write_config16(NB, DRB + (2 * i), drb); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 885 | |
| 886 | /* Brings the upper DRB back down to be base for |
| 887 | * DRB calculations for the next two rows. |
| 888 | */ |
| 889 | drb >>= 8; |
| 890 | |
| 891 | rps |= (dra & 0x0f) << (i * 4); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | /* Set paging policy register. */ |
| 895 | pci_write_config8(NB, PGPOL + 1, bpr); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 896 | PRINT_DEBUG("PGPOL[BPR] has been set to 0x%02x\n", bpr); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 897 | |
| 898 | /* Set DRAM row page size register. */ |
| 899 | pci_write_config16(NB, RPS, rps); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 900 | PRINT_DEBUG("RPS has been set to 0x%04x\n", rps); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 901 | |
| 902 | /* ### ECC */ |
| 903 | pci_write_config8(NB, NBXCFG + 3, nbxecc); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 904 | PRINT_DEBUG("NBXECC[31:24] has been set to 0x%02x\n", nbxecc); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 905 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 906 | /* Set DRAMC[4:3] to proper memory type (EDO/SDRAM/Registered SDRAM). */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 907 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 908 | /* i will be used to set DRAMC[4:3]. */ |
| 909 | if (regsd && sd) { |
| 910 | i = 0x10; // Registered SDRAM |
| 911 | } else if (sd) { |
| 912 | i = 0x08; // SDRAM |
| 913 | } else { |
| 914 | i = 0; // EDO |
| 915 | } |
| 916 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 917 | value = pci_read_config8(NB, DRAMC) & 0xe7; |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 918 | value |= i; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 919 | pci_write_config8(NB, DRAMC, value); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 920 | PRINT_DEBUG("DRAMC has been set to 0x%02x\n", value); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 921 | } |
| 922 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 923 | void sdram_set_spd_registers(void) |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 924 | { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 925 | /* Setup DRAM row boundary registers and other attributes. */ |
| 926 | set_dram_row_attributes(); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 927 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 928 | /* Setup DRAM buffer strength. */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 929 | set_dram_buffer_strength(); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 930 | |
| 931 | /* TODO: Set PMCR? */ |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 932 | // pci_write_config8(NB, PMCR, 0x14); |
| 933 | pci_write_config8(NB, PMCR, 0x10); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 934 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 935 | /* TODO: This is for EDO memory only. */ |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 936 | pci_write_config8(NB, DRAMT, 0x03); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 937 | } |
| 938 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 939 | void sdram_enable(void) |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 940 | { |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 941 | int i; |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 942 | |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 943 | /* 0. Wait until power/voltages and clocks are stable (200us). */ |
| 944 | udelay(200); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 945 | |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 946 | /* 1. Apply NOP. Wait 200 clock cycles (200us should do). */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 947 | PRINT_DEBUG("RAM Enable 1: Apply NOP\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 948 | do_ram_command(RAM_COMMAND_NOP); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 949 | udelay(200); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 950 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 951 | /* 2. Precharge all. Wait tRP. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 952 | PRINT_DEBUG("RAM Enable 2: Precharge all\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 953 | do_ram_command(RAM_COMMAND_PRECHARGE); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 954 | udelay(1); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 955 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 956 | /* 3. Perform 8 refresh cycles. Wait tRC each time. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 957 | PRINT_DEBUG("RAM Enable 3: CBR\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 958 | for (i = 0; i < 8; i++) { |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 959 | do_ram_command(RAM_COMMAND_CBR); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 960 | udelay(1); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 961 | } |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 962 | |
| 963 | /* 4. Mode register set. Wait two memory cycles. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 964 | PRINT_DEBUG("RAM Enable 4: Mode register set\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 965 | do_ram_command(RAM_COMMAND_MRS); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 966 | udelay(2); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 967 | |
| 968 | /* 5. Normal operation. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 969 | PRINT_DEBUG("RAM Enable 5: Normal operation\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 970 | do_ram_command(RAM_COMMAND_NORMAL); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 971 | udelay(1); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 972 | |
| 973 | /* 6. Finally enable refresh. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 974 | PRINT_DEBUG("RAM Enable 6: Enable refresh\n"); |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 975 | // pci_write_config8(NB, PMCR, 0x10); |
| 976 | spd_enable_refresh(); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 977 | udelay(1); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 978 | |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 979 | PRINT_DEBUG("Northbridge following SDRAM init:\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 980 | DUMPNORTH(); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 981 | } |