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 | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 5 | * Copyright (C) 2010 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. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
Paul Menzel | a46a712 | 2013-02-23 18:37:27 +0100 | [diff] [blame] | 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 20 | */ |
| 21 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 22 | #include <spd.h> |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 23 | #include <delay.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 24 | #include <stdint.h> |
Carl-Daniel Hailfinger | 2ee6779 | 2008-10-01 12:52:52 +0000 | [diff] [blame] | 25 | #include <stdlib.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 26 | #include <arch/io.h> |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 27 | #include <device/pci_def.h> |
| 28 | #include <console/console.h> |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 29 | #include "i440bx.h" |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 30 | #include "raminit.h" |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 31 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 32 | /*----------------------------------------------------------------------------- |
| 33 | Macros and definitions. |
| 34 | -----------------------------------------------------------------------------*/ |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 35 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 36 | #define NB PCI_DEV(0, 0, 0) |
| 37 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 38 | /* Debugging macros. */ |
Uwe Hermann | 01ce601 | 2010-03-05 10:03:50 +0000 | [diff] [blame] | 39 | #if CONFIG_DEBUG_RAM_SETUP |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 40 | #define PRINT_DEBUG(x...) printk(BIOS_DEBUG, x) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 41 | #define DUMPNORTH() dump_pci_device(NB) |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 42 | #else |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 43 | #define PRINT_DEBUG(x...) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 44 | #define DUMPNORTH() |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 45 | #endif |
| 46 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 47 | /* SDRAMC[7:5] - SDRAM Mode Select (SMS). */ |
| 48 | #define RAM_COMMAND_NORMAL 0x0 |
| 49 | #define RAM_COMMAND_NOP 0x1 |
| 50 | #define RAM_COMMAND_PRECHARGE 0x2 |
| 51 | #define RAM_COMMAND_MRS 0x3 |
| 52 | #define RAM_COMMAND_CBR 0x4 |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 53 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 54 | /* Map the JEDEC SPD refresh rates (array index) to 440BX refresh rates as |
| 55 | * defined in DRAMC[2:0]. |
| 56 | * |
| 57 | * [0] == Normal 15.625 us -> 15.6 us |
| 58 | * [1] == Reduced(.25X) 3.9 us -> 7.8 ns |
| 59 | * [2] == Reduced(.5X) 7.8 us -> 7.8 us |
| 60 | * [3] == Extended(2x) 31.3 us -> 31.2 us |
| 61 | * [4] == Extended(4x) 62.5 us -> 62.4 us |
| 62 | * [5] == Extended(8x) 125 us -> 124.8 us |
| 63 | */ |
| 64 | static const uint32_t refresh_rate_map[] = { |
| 65 | 1, 5, 5, 2, 3, 4 |
| 66 | }; |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 67 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 68 | /* Table format: register, bitmask, value. */ |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 69 | static const u8 register_values[] = { |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 70 | /* NBXCFG - NBX Configuration Register |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 71 | * 0x50 - 0x53 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 72 | * |
| 73 | * [31:24] SDRAM Row Without ECC |
| 74 | * 0 = ECC components are populated in this row |
| 75 | * 1 = ECC components are not populated in this row |
| 76 | * [23:19] Reserved |
| 77 | * [18:18] Host Bus Fast Data Ready Enable (HBFDRE) |
| 78 | * Assertion of DRAM data on host bus occurs... |
| 79 | * 0 = ...one clock after sampling snoop results (default) |
| 80 | * 1 = ...on the same clock the snoop result is being sampled |
| 81 | * (this mode is faster by one clock cycle) |
| 82 | * [17:17] ECC - EDO static Drive mode |
| 83 | * 0 = Normal mode (default) |
| 84 | * 1 = ECC signals are always driven |
| 85 | * [16:16] IDSEL_REDIRECT |
| 86 | * 0 = IDSEL1 is allocated to this bridge (default) |
| 87 | * 1 = IDSEL7 is allocated to this bridge |
| 88 | * [15:15] WSC# Handshake Disable |
| 89 | * 1 = Uni-processor mode |
| 90 | * 0 = Dual-processor mode with external IOAPIC (default) |
| 91 | * [14:14] Intel Reserved |
| 92 | * [13:12] Host/DRAM Frequency |
| 93 | * 00 = 100 MHz |
| 94 | * 01 = Reserved |
| 95 | * 10 = 66 MHz |
| 96 | * 11 = Reserved |
| 97 | * [11:11] AGP to PCI Access Enable |
| 98 | * 1 = Enable |
| 99 | * 0 = Disable |
| 100 | * [10:10] PCI Agent to Aperture Access Disable |
| 101 | * 1 = Disable |
| 102 | * 0 = Enable (default) |
| 103 | * [09:09] Aperture Access Global Enable |
| 104 | * 1 = Enable |
| 105 | * 0 = Disable |
| 106 | * [08:07] DRAM Data Integrity Mode (DDIM) |
| 107 | * 00 = Non-ECC |
| 108 | * 01 = EC-only |
| 109 | * 10 = ECC Mode |
| 110 | * 11 = ECC Mode with hardware scrubbing enabled |
| 111 | * [06:06] ECC Diagnostic Mode Enable (EDME) |
| 112 | * 1 = Enable |
| 113 | * 0 = Normal operation mode (default) |
| 114 | * [05:05] MDA Present (MDAP) |
| 115 | * Works in conjunction with the VGA_EN bit. |
| 116 | * VGA_EN MDAP |
| 117 | * 0 x All VGA cycles are sent to PCI |
| 118 | * 1 0 All VGA cycles are sent to AGP |
| 119 | * 1 1 All VGA cycles are sent to AGP, except for |
| 120 | * cycles in the MDA range. |
| 121 | * [04:04] Reserved |
| 122 | * [03:03] USWC Write Post During I/O Bridge Access Enable (UWPIO) |
| 123 | * 1 = Enable |
| 124 | * 0 = Disable |
| 125 | * [02:02] In-Order Queue Depth (IOQD) |
| 126 | * 1 = In-order queue = maximum |
| 127 | * 0 = A7# is sampled asserted (i.e., 0) |
| 128 | * [01:00] Reserved |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 129 | */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 130 | NBXCFG + 0, 0x00, 0x0c, |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 131 | // TODO: Bit 15 should be 0 for multiprocessor boards |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 132 | NBXCFG + 1, 0x00, 0x80, |
| 133 | NBXCFG + 2, 0x00, 0x00, |
| 134 | NBXCFG + 3, 0x00, 0xff, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 135 | |
| 136 | /* DRAMC - DRAM Control Register |
| 137 | * 0x57 |
| 138 | * |
| 139 | * [7:6] Reserved |
| 140 | * [5:5] Module Mode Configuration (MMCONFIG) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 141 | * The combination of SDRAMPWR and this bit (which is set by an |
| 142 | * external strapping option) determine how CKE works. |
| 143 | * SDRAMPWR MMCONFIG |
| 144 | * 0 0 = 3 DIMM, CKE0[5:0] driven |
| 145 | * X 1 = 3 DIMM, CKE0 only |
| 146 | * 1 0 = 4 DIMM, GCKE only |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 147 | * [4:3] DRAM Type (DT) |
| 148 | * 00 = EDO |
| 149 | * 01 = SDRAM |
| 150 | * 10 = Registered SDRAM |
| 151 | * 11 = Reserved |
| 152 | * Note: EDO, SDRAM and Registered SDRAM cannot be mixed. |
| 153 | * [2:0] DRAM Refresh Rate (DRR) |
| 154 | * 000 = Refresh disabled |
| 155 | * 001 = 15.6 us |
| 156 | * 010 = 31.2 us |
| 157 | * 011 = 62.4 us |
| 158 | * 100 = 124.8 us |
| 159 | * 101 = 249.6 us |
| 160 | * 110 = Reserved |
| 161 | * 111 = Reserved |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 162 | */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 163 | /* Choose SDRAM (not registered), and disable refresh for now. */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 164 | DRAMC, 0x00, 0x08, |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 165 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 166 | /* |
| 167 | * PAM[6:0] - Programmable Attribute Map Registers |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 168 | * 0x59 - 0x5f |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 169 | * |
| 170 | * 0x59 [3:0] Reserved |
| 171 | * 0x59 [5:4] 0xF0000 - 0xFFFFF BIOS area |
| 172 | * 0x5a [1:0] 0xC0000 - 0xC3FFF ISA add-on BIOS |
| 173 | * 0x5a [5:4] 0xC4000 - 0xC7FFF ISA add-on BIOS |
| 174 | * 0x5b [1:0] 0xC8000 - 0xCBFFF ISA add-on BIOS |
| 175 | * 0x5b [5:4] 0xCC000 - 0xCFFFF ISA add-on BIOS |
| 176 | * 0x5c [1:0] 0xD0000 - 0xD3FFF ISA add-on BIOS |
| 177 | * 0x5c [5:4] 0xD4000 - 0xD7FFF ISA add-on BIOS |
| 178 | * 0x5d [1:0] 0xD8000 - 0xDBFFF ISA add-on BIOS |
| 179 | * 0x5d [5:4] 0xDC000 - 0xDFFFF ISA add-on BIOS |
| 180 | * 0x5e [1:0] 0xE0000 - 0xE3FFF BIOS entension |
| 181 | * 0x5e [5:4] 0xE4000 - 0xE7FFF BIOS entension |
| 182 | * 0x5f [1:0] 0xE8000 - 0xEBFFF BIOS entension |
| 183 | * 0x5f [5:4] 0xEC000 - 0xEFFFF BIOS entension |
| 184 | * |
| 185 | * Bit assignment: |
| 186 | * 00 = DRAM Disabled (all access goes to memory mapped I/O space) |
| 187 | * 01 = Read Only (Reads to DRAM, writes to memory mapped I/O space) |
| 188 | * 10 = Write Only (Writes to DRAM, reads to memory mapped I/O space) |
| 189 | * 11 = Read/Write (all access goes to DRAM) |
| 190 | */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 191 | |
| 192 | /* |
| 193 | * Map all legacy regions to RAM (read/write). This is required if |
| 194 | * you want to use the RAM area from 768 KB - 1 MB. If the PAM |
| 195 | * registers are not set here appropriately, the RAM in that region |
| 196 | * will not be accessible, thus a RAM check of it will also fail. |
| 197 | * |
| 198 | * TODO: This was set in sdram_set_spd_registers(). |
| 199 | * Test if it still works when set here. |
| 200 | */ |
| 201 | PAM0, 0x00, 0x30, |
| 202 | PAM1, 0x00, 0x33, |
| 203 | PAM2, 0x00, 0x33, |
| 204 | PAM3, 0x00, 0x33, |
| 205 | PAM4, 0x00, 0x33, |
| 206 | PAM5, 0x00, 0x33, |
| 207 | PAM6, 0x00, 0x33, |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 208 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 209 | /* DRB[0:7] - DRAM Row Boundary Registers |
| 210 | * 0x60 - 0x67 |
| 211 | * |
| 212 | * An array of 8 byte registers, which hold the ending memory address |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 213 | * assigned to each pair of DIMMs, in 8MB granularity. |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 214 | * |
| 215 | * 0x60 DRB0 = Total memory in row0 (in 8 MB) |
| 216 | * 0x61 DRB1 = Total memory in row0+1 (in 8 MB) |
| 217 | * 0x62 DRB2 = Total memory in row0+1+2 (in 8 MB) |
| 218 | * 0x63 DRB3 = Total memory in row0+1+2+3 (in 8 MB) |
| 219 | * 0x64 DRB4 = Total memory in row0+1+2+3+4 (in 8 MB) |
| 220 | * 0x65 DRB5 = Total memory in row0+1+2+3+4+5 (in 8 MB) |
| 221 | * 0x66 DRB6 = Total memory in row0+1+2+3+4+5+6 (in 8 MB) |
| 222 | * 0x67 DRB7 = Total memory in row0+1+2+3+4+5+6+7 (in 8 MB) |
| 223 | */ |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 224 | /* Set the DRBs to zero for now, this will be fixed later. */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 225 | DRB0, 0x00, 0x00, |
| 226 | DRB1, 0x00, 0x00, |
| 227 | DRB2, 0x00, 0x00, |
| 228 | DRB3, 0x00, 0x00, |
| 229 | DRB4, 0x00, 0x00, |
| 230 | DRB5, 0x00, 0x00, |
| 231 | DRB6, 0x00, 0x00, |
| 232 | DRB7, 0x00, 0x00, |
| 233 | |
| 234 | /* FDHC - Fixed DRAM Hole Control Register |
| 235 | * 0x68 |
| 236 | * |
| 237 | * Controls two fixed DRAM holes: 512 KB - 640 KB and 15 MB - 16 MB. |
| 238 | * |
| 239 | * [7:6] Hole Enable (HEN) |
| 240 | * 00 = None |
| 241 | * 01 = 512 KB - 640 KB (128 KB) |
| 242 | * 10 = 15 MB - 16 MB (1 MB) |
| 243 | * 11 = Reserved |
| 244 | * [5:0] Reserved |
| 245 | */ |
| 246 | /* No memory holes. */ |
| 247 | FDHC, 0x00, 0x00, |
| 248 | |
| 249 | /* RPS - SDRAM Row Page Size Register |
| 250 | * 0x74 - 0x75 |
| 251 | * |
| 252 | * Sets the row page size for SDRAM. For EDO memory, the page |
| 253 | * size is fixed at 2 KB. |
| 254 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 255 | * Bits[1:0] Page Size |
| 256 | * 00 2 KB |
| 257 | * 01 4 KB |
| 258 | * 10 8 KB |
| 259 | * 11 Reserved |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 260 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 261 | * RPS bits Corresponding DRB register |
| 262 | * [01:00] DRB[0], row 0 |
| 263 | * [03:02] DRB[1], row 1 |
| 264 | * [05:04] DRB[2], row 2 |
| 265 | * [07:06] DRB[3], row 3 |
| 266 | * [09:08] DRB[4], row 4 |
| 267 | * [11:10] DRB[5], row 5 |
| 268 | * [13:12] DRB[6], row 6 |
| 269 | * [15:14] DRB[7], row 7 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 270 | */ |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 271 | /* Power on defaults to 2KB. Will be set later. */ |
| 272 | // RPS + 0, 0x00, 0x00, |
| 273 | // RPS + 1, 0x00, 0x00, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 274 | |
| 275 | /* SDRAMC - SDRAM Control Register |
Uwe Hermann | 7ea18cf | 2007-05-04 00:51:17 +0000 | [diff] [blame] | 276 | * 0x76 - 0x77 |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 277 | * |
| 278 | * [15:10] Reserved |
| 279 | * [09:08] Idle/Pipeline DRAM Leadoff Timing (IPDLT) |
| 280 | * 00 = Illegal |
| 281 | * 01 = Add a clock delay to the lead-off clock count |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 282 | * 1x = Illegal |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 283 | * [07:05] SDRAM Mode Select (SMS) |
| 284 | * 000 = Normal SDRAM Operation (default) |
| 285 | * 001 = NOP Command Enable |
| 286 | * 010 = All Banks Precharge Enable |
| 287 | * 011 = Mode Register Set Enable |
| 288 | * 100 = CBR Enable |
| 289 | * 101 = Reserved |
| 290 | * 110 = Reserved |
| 291 | * 111 = Reserved |
| 292 | * [04:04] SDRAMPWR |
| 293 | * 0 = 3 DIMM configuration |
| 294 | * 1 = 4 DIMM configuration |
| 295 | * [03:03] Leadoff Command Timing (LCT) |
| 296 | * 0 = 4 CS# Clock |
| 297 | * 1 = 3 CS# Clock |
| 298 | * [02:02] CAS# Latency (CL) |
| 299 | * 0 = 3 DCLK CAS# latency |
| 300 | * 1 = 2 DCLK CAS# latency |
| 301 | * [01:01] SDRAM RAS# to CAS# Delay (SRCD) |
| 302 | * 0 = 3 clocks between a row activate and a read or write cmd. |
| 303 | * 1 = 2 clocks between a row activate and a read or write cmd. |
| 304 | * [00:00] SDRAM RAS# Precharge (SRP) |
| 305 | * 0 = 3 clocks of RAS# precharge |
| 306 | * 1 = 2 clocks of RAS# precharge |
| 307 | */ |
Keith Hui | 9c1e1f0 | 2010-03-13 20:16:48 +0000 | [diff] [blame] | 308 | #if CONFIG_SDRAMPWR_4DIMM |
| 309 | SDRAMC + 0, 0x00, 0x10, /* The board has 4 DIMM slots. */ |
| 310 | #else |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 311 | SDRAMC + 0, 0x00, 0x00, /* The board has 3 DIMM slots. */ |
Keith Hui | 9c1e1f0 | 2010-03-13 20:16:48 +0000 | [diff] [blame] | 312 | #endif |
Mats Erik Andersson | 45db366 | 2008-09-30 04:52:29 +0000 | [diff] [blame] | 313 | SDRAMC + 1, 0x00, 0x00, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 314 | |
| 315 | /* PGPOL - Paging Policy Register |
| 316 | * 0x78 - 0x79 |
| 317 | * |
| 318 | * [15:08] Banks per Row (BPR) |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 319 | * Each bit in this field corresponds to one row of the memory |
| 320 | * array. Bit 15 corresponds to row 7 while bit 8 corresponds |
| 321 | * to row 0. Bits for empty rows are "don't care". |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 322 | * 0 = 2 banks |
| 323 | * 1 = 4 banks |
| 324 | * [07:05] Reserved |
| 325 | * [04:04] Intel Reserved |
| 326 | * [03:00] DRAM Idle Timer (DIT) |
| 327 | * 0000 = 0 clocks |
| 328 | * 0001 = 2 clocks |
| 329 | * 0010 = 4 clocks |
| 330 | * 0011 = 8 clocks |
| 331 | * 0100 = 10 clocks |
| 332 | * 0101 = 12 clocks |
| 333 | * 0110 = 16 clocks |
| 334 | * 0111 = 32 clocks |
| 335 | * 1xxx = Infinite (pages are not closed for idle condition) |
| 336 | */ |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 337 | PGPOL + 0, 0x00, 0x00, |
| 338 | PGPOL + 1, 0x00, 0xff, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 339 | |
| 340 | /* PMCR - Power Management Control Register |
| 341 | * 0x7a |
| 342 | * |
| 343 | * [07:07] Power Down SDRAM Enable (PDSE) |
| 344 | * 1 = Enable |
| 345 | * 0 = Disable |
| 346 | * [06:06] ACPI Control Register Enable (SCRE) |
| 347 | * 1 = Enable |
| 348 | * 0 = Disable (default) |
| 349 | * [05:05] Suspend Refresh Type (SRT) |
| 350 | * 1 = Self refresh mode |
| 351 | * 0 = CBR fresh mode |
| 352 | * [04:04] Normal Refresh Enable (NREF_EN) |
| 353 | * 1 = Enable |
| 354 | * 0 = Disable |
| 355 | * [03:03] Quick Start Mode (QSTART) |
| 356 | * 1 = Quick start mode for the processor is enabled |
| 357 | * [02:02] Gated Clock Enable (GCLKEN) |
| 358 | * 1 = Enable |
| 359 | * 0 = Disable |
| 360 | * [01:01] AGP Disable (AGP_DIS) |
| 361 | * 1 = Disable |
| 362 | * 0 = Enable |
| 363 | * [00:00] CPU reset without PCIRST enable (CRst_En) |
| 364 | * 1 = Enable |
| 365 | * 0 = Disable |
| 366 | */ |
| 367 | /* Enable normal refresh and the gated clock. */ |
| 368 | // TODO: Only do this later? |
| 369 | // PMCR, 0x00, 0x14, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 370 | PMCR, 0x00, 0x00, |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 371 | |
| 372 | /* Enable SCRR.SRRAEN and let BX choose the SRR. */ |
| 373 | SCRR + 1, 0x00, 0x10, |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 374 | }; |
| 375 | |
| 376 | /*----------------------------------------------------------------------------- |
| 377 | SDRAM configuration functions. |
| 378 | -----------------------------------------------------------------------------*/ |
| 379 | |
| 380 | /** |
| 381 | * Send the specified RAM command to all DIMMs. |
| 382 | * |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 383 | * @param command The RAM command to send to the DIMM(s). |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 384 | */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 385 | static void do_ram_command(u32 command) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 386 | { |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 387 | int i, caslatency; |
| 388 | u8 dimm_start, dimm_end; |
| 389 | u16 reg16; |
| 390 | u32 addr, addr_offset; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 391 | |
| 392 | /* Configure the RAM command. */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 393 | reg16 = pci_read_config16(NB, SDRAMC); |
| 394 | reg16 &= 0xff1f; /* Clear bits 7-5. */ |
| 395 | reg16 |= (u16) (command << 5); /* Write command into bits 7-5. */ |
| 396 | pci_write_config16(NB, SDRAMC, reg16); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 397 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 398 | /* |
| 399 | * RAM_COMMAND_NORMAL affects only the memory controller and |
| 400 | * doesn't need to be "sent" to the DIMMs. |
| 401 | */ |
| 402 | if (command == RAM_COMMAND_NORMAL) |
| 403 | return; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 404 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 405 | /* Send the RAM command to each row of memory. */ |
| 406 | dimm_start = 0; |
| 407 | for (i = 0; i < (DIMM_SOCKETS * 2); i++) { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 408 | addr_offset = 0; |
| 409 | caslatency = 3; /* TODO: Dynamically get CAS latency later. */ |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 410 | if (command == RAM_COMMAND_MRS) { |
| 411 | /* |
| 412 | * MAA[12:11,9:0] must be inverted when sent to DIMM |
| 413 | * 2 or 3 (no inversion if sent to DIMM 0 or 1). |
| 414 | */ |
| 415 | if ((i >= 0 && i <= 3) && caslatency == 3) |
| 416 | addr_offset = 0x1d0; |
| 417 | if ((i >= 4 && i <= 7) && caslatency == 3) |
| 418 | addr_offset = 0x1e28; |
| 419 | if ((i >= 0 && i <= 3) && caslatency == 2) |
| 420 | addr_offset = 0x150; |
| 421 | if ((i >= 4 && i <= 7) && caslatency == 2) |
| 422 | addr_offset = 0x1ea8; |
| 423 | } |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 424 | |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 425 | dimm_end = pci_read_config8(NB, DRB + i); |
| 426 | |
| 427 | addr = (dimm_start * 8 * 1024 * 1024) + addr_offset; |
| 428 | if (dimm_end > dimm_start) { |
| 429 | #if 0 |
Stefan Reinauer | fc01e5e | 2010-12-27 14:31:05 +0000 | [diff] [blame] | 430 | PRINT_DEBUG(" Sending RAM command 0x%04x to 0x%08x\n", |
| 431 | reg16, addr); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 432 | #endif |
| 433 | |
| 434 | read32(addr); |
| 435 | } |
| 436 | |
| 437 | /* Set the start of the next DIMM. */ |
| 438 | dimm_start = dimm_end; |
| 439 | } |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 440 | } |
| 441 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 442 | static void set_dram_buffer_strength(void) |
| 443 | { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 444 | /* To give some breathing room for romcc, |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 445 | * mbsc0 doubles as drb |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 446 | * mbsc1 doubles as drb1 |
| 447 | * mbfs0 doubles as i and reg |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 448 | */ |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 449 | uint8_t mbsc0,mbsc1,mbsc3,mbsc4,mbfs0,mbfs2,fsb; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 450 | |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 451 | /* 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] | 452 | * This determines how to program MBFS and MBSC. |
| 453 | */ |
| 454 | uint8_t dimm03 = 0; |
| 455 | uint8_t dimm47 = 0; |
| 456 | |
| 457 | mbsc0 = 0; |
| 458 | for (mbfs0 = DRB0; mbfs0 <= DRB7; mbfs0++) { |
| 459 | mbsc1 = pci_read_config8(NB, mbfs0); |
| 460 | if (mbsc0 != mbsc1) { |
| 461 | if (mbfs0 <= DRB3) { |
| 462 | dimm03++; |
| 463 | } else { |
| 464 | dimm47++; |
| 465 | } |
| 466 | mbsc0 = mbsc1; |
| 467 | } |
| 468 | } |
| 469 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 470 | /* Algorithm bitmap for programming MBSC[39:0] and MBFS[23:0]. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 471 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 472 | * The 440BX datasheet says buffer frequency is independent from bus |
| 473 | * frequency and mismatch both ways are possible. This is how it is |
| 474 | * programmed in the ASUS P2B-LS mainboard. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 475 | * |
| 476 | * There are four main conditions to check when programming DRAM buffer |
| 477 | * frequency and strength: |
| 478 | * |
| 479 | * a: >2 rows populated across DIMM0,1 |
| 480 | * b: >2 rows populated across DIMM2,3 |
| 481 | * c: >4 rows populated across all DIMM slots |
| 482 | * and either one of: |
| 483 | * 1: NBXCFG[13] strapped as 100MHz, or |
| 484 | * 6: NBXCFG[13] strapped as 66MHz |
| 485 | * |
| 486 | * CKE0/FENA ----------------------------------------------------------+ |
| 487 | * CKE1/GCKE -------------------[ MBFS ]------------------------+| |
| 488 | * DQMA/CASA[764320]# ----------[ 0 = 66MHz ]-----------------------+|| |
| 489 | * DQMB1/CASB1# ----------------[ 1 = 100MHz ]----------------------+||| |
| 490 | * DQMB5/CASB5# ---------------------------------------------------+|||| |
| 491 | * DQMA1/CASA1# --------------------------------------------------+||||| |
| 492 | * DQMA5/CASA5# -------------------------------------------------+|||||| |
| 493 | * CSA0-5#,CSB0-5# ----------------------------------------++++++||||||| |
| 494 | * CSA6#/CKE2# -------------------------------------------+||||||||||||| |
| 495 | * CSB6#/CKE4# ------------------------------------------+|||||||||||||| |
| 496 | * CSA7#/CKE3# -----------------------------------------+||||||||||||||| |
| 497 | * CSB7#/CKE5# ----------------------------------------+|||||||||||||||| |
| 498 | * MECC[7:0] #2/#1 (100MHz) -------------------------++||||||||||||||||| |
| 499 | * MD[63:0] #2/#1 (100MHz) ------------------------++||||||||||||||||||| |
| 500 | * MAB[12:11,9:0]#,MAB[13,10],WEB#,SRASB#,SCASB# -+||||||||||||||||||||| |
| 501 | * MAA[13:0],WEA#,SRASA#,SCASA# -----------------+|||||||||||||||||||||| |
| 502 | * Reserved ------------------------------------+||||||||||||||||||||||| |
| 503 | * |||||||||||||||||||||||| |
| 504 | * 3 32 21 10 0 * 2 21 10 0 |
| 505 | * 9876543210987654321098765432109876543210 * 321098765432109876543210 |
| 506 | * a 10------------------------1010---------- * -1---------------11----- a |
| 507 | *!a 11------------------------1111---------- * -0---------------00----- !a |
| 508 | * b --10--------------------------1010------ * --1----------------11--- b |
| 509 | *!b --11--------------------------1111------ * --0----------------00--- !b |
| 510 | * c ----------------------------------1100-- * ----------------------1- c |
| 511 | *!c ----------------------------------1011-- * ----------------------0- !c |
| 512 | * 1 ----1010101000000000000000------------00 * ---11111111111111----1-0 1 |
| 513 | * 6 ----000000000000000000000010101010----00 * ---1111111111111100000-0 6 |
| 514 | * | | | | | | | | | | ||||||| | | | | | | |
| 515 | * | | | | | | | | | | ||||||| | | | | | +- CKE0/FENA |
| 516 | * | | | | | | | | | | ||||||| | | | | +--- CKE1/GCKE |
| 517 | * | | | | | | | | | | ||||||| | | | +----- DQMA/CASA[764320]# |
| 518 | * | | | | | | | | | | ||||||| | | +------- DQMB1/CASB1# |
| 519 | * | | | | | | | | | | ||||||| | +--------- DQMB5/CASB5# |
| 520 | * | | | | | | | | | | ||||||| +----------- DQMA1/CASA1# |
| 521 | * | | | | | | | | | | ||||||+------------- DQMA5/CASA5# |
| 522 | * | | | | | | | | | | ++++++-------------- CSA0-5#,CSB0-5# [ 0=1x;1=2x ] |
| 523 | * | | | | | | | | | +--------------------- CSA6#/CKE2# |
| 524 | * | | | | | | | | +---[ MBSC ]------ CSB6#/CKE4# |
| 525 | * | | | | | | | +-----[ 00 = 1x ]------ CSA7#/CKE3# |
| 526 | * | | | | | | +-------[ 01 invalid ]------ CSB7#/CKE5# |
| 527 | * | | | | | +---------[ 10 = 2x ]------ MECC[7:0] #1 (2x) |
| 528 | * | | | | +-----------[ 11 = 3x ]------ MECC[7:0] #2 (2x) |
| 529 | * | | | +--------------------------------- MD[63:0] #1 (2x) |
| 530 | * | | +----------------------------------- MD[63:0] #2 (2x) |
| 531 | * | +------------------------------------- MAB[12:11,9:0]#,MAB[13,10],WEB#,SRASB#,SCASB# |
| 532 | * +--------------------------------------- MAA[13:0],WEA#,SRASA#,SCASA# |
| 533 | * MBSC[47:40] and MBFS[23] are reserved. |
| 534 | * |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 535 | * This algorithm is checked against the ASUS P2B-LS (which has |
| 536 | * 4 DIMM slots) factory BIOS. |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 537 | * Therefore it assumes a board with 4 slots, and will need testing |
| 538 | * on boards with 3 DIMM slots. |
| 539 | */ |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 540 | |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 541 | mbsc0 = 0x80; |
| 542 | mbsc1 = 0x2a; |
| 543 | mbfs2 = 0x1f; |
| 544 | if (pci_read_config8(NB, NBXCFG + 1) & 0x30) { |
| 545 | fsb = 66; |
| 546 | mbsc3 = 0x00; |
| 547 | mbsc4 = 0x00; |
| 548 | mbfs0 = 0x80; |
| 549 | } else { |
| 550 | fsb = 100; |
| 551 | mbsc3 = 0xa0; |
| 552 | mbsc4 = 0x0a; |
| 553 | mbfs0 = 0x84; |
| 554 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 555 | |
| 556 | if (dimm03 > 2) { |
| 557 | mbsc4 = mbsc4 | 0x80; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 558 | mbsc1 = mbsc1 | 0x28; |
| 559 | mbfs2 = mbfs2 | 0x40; |
| 560 | mbfs0 = mbfs0 | 0x60; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 561 | } else { |
| 562 | mbsc4 = mbsc4 | 0xc0; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 563 | if (fsb == 100) { |
| 564 | mbsc1 = mbsc1 | 0x3c; |
| 565 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 566 | } |
| 567 | if (dimm47 > 2) { |
| 568 | mbsc4 = mbsc4 | 0x20; |
| 569 | mbsc1 = mbsc1 | 0x02; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 570 | mbsc0 = mbsc0 | 0x80; |
| 571 | mbfs2 = mbfs2 | 0x20; |
| 572 | mbfs0 = mbfs0 | 0x18; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 573 | } else { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 574 | mbsc4 = mbsc4 | 0x30; |
| 575 | if (fsb == 100) { |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 576 | mbsc1 = mbsc1 | 0x03; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 577 | mbsc0 = mbsc0 | 0xc0; |
| 578 | } |
| 579 | } |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 580 | if ((dimm03 + dimm47) > 4) { |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 581 | mbsc0 = mbsc0 | 0x30; |
| 582 | mbfs0 = mbfs0 | 0x02; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 583 | } else { |
| 584 | mbsc0 = mbsc0 | 0x2c; |
Keith Hui | b48ba66 | 2010-03-17 02:15:07 +0000 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | pci_write_config8(NB, MBSC + 0, mbsc0); |
| 588 | pci_write_config8(NB, MBSC + 1, mbsc1); |
| 589 | pci_write_config8(NB, MBSC + 2, 0x00); |
| 590 | pci_write_config8(NB, MBSC + 3, mbsc3); |
| 591 | pci_write_config8(NB, MBSC + 4, mbsc4); |
| 592 | pci_write_config8(NB, MBFS + 0, mbfs0); |
| 593 | pci_write_config8(NB, MBFS + 1, 0xff); |
| 594 | pci_write_config8(NB, MBFS + 2, mbfs2); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 595 | } |
| 596 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 597 | /*----------------------------------------------------------------------------- |
| 598 | DIMM-independant configuration functions. |
| 599 | -----------------------------------------------------------------------------*/ |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 600 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 601 | static void spd_enable_refresh(void) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 602 | { |
| 603 | int i, value; |
| 604 | uint8_t reg; |
| 605 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 606 | reg = pci_read_config8(NB, DRAMC); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 607 | |
| 608 | for (i = 0; i < DIMM_SOCKETS; i++) { |
Uwe Hermann | d773fd3 | 2010-11-20 20:23:08 +0000 | [diff] [blame] | 609 | value = spd_read_byte(DIMM0 + i, SPD_REFRESH); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 610 | if (value < 0) |
| 611 | continue; |
| 612 | reg = (reg & 0xf8) | refresh_rate_map[(value & 0x7f)]; |
| 613 | |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 614 | 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] | 615 | } |
| 616 | |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 617 | pci_write_config8(NB, DRAMC, reg); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 618 | } |
| 619 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 620 | /*----------------------------------------------------------------------------- |
| 621 | Public interface. |
| 622 | -----------------------------------------------------------------------------*/ |
| 623 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 624 | void sdram_set_registers(void) |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 625 | { |
| 626 | int i, max; |
Uwe Hermann | bc359473 | 2007-06-07 22:16:30 +0000 | [diff] [blame] | 627 | uint8_t reg; |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 628 | |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 629 | PRINT_DEBUG("Northbridge prior to SDRAM init:\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 630 | DUMPNORTH(); |
| 631 | |
Carl-Daniel Hailfinger | 2ee6779 | 2008-10-01 12:52:52 +0000 | [diff] [blame] | 632 | max = ARRAY_SIZE(register_values); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 633 | |
Uwe Hermann | f5a6fd2 | 2007-05-27 23:31:31 +0000 | [diff] [blame] | 634 | /* Set registers as specified in the register_values[] array. */ |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 635 | for (i = 0; i < max; i += 3) { |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 636 | reg = pci_read_config8(NB, register_values[i]); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 637 | reg &= register_values[i + 1]; |
| 638 | reg |= register_values[i + 2] & ~(register_values[i + 1]); |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 639 | pci_write_config8(NB, register_values[i], reg); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 640 | #if 0 |
Stefan Reinauer | fc01e5e | 2010-12-27 14:31:05 +0000 | [diff] [blame] | 641 | PRINT_DEBUG(" Set register 0x%02x to 0x%02x\n", |
| 642 | register_values[i], reg); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 643 | #endif |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 647 | struct dimm_size { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 648 | u32 side1; |
| 649 | u32 side2; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 650 | }; |
| 651 | |
| 652 | static struct dimm_size spd_get_dimm_size(unsigned int device) |
| 653 | { |
| 654 | struct dimm_size sz; |
| 655 | int i, module_density, dimm_banks; |
| 656 | sz.side1 = 0; |
| 657 | module_density = spd_read_byte(device, SPD_DENSITY_OF_EACH_ROW_ON_MODULE); |
| 658 | dimm_banks = spd_read_byte(device, SPD_NUM_DIMM_BANKS); |
| 659 | |
| 660 | /* Find the size of side1. */ |
| 661 | /* Find the larger value. The larger value is always side1. */ |
| 662 | for (i = 512; i >= 0; i >>= 1) { |
| 663 | if ((module_density & i) == i) { |
| 664 | sz.side1 = i; |
| 665 | break; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | /* Set to 0 in case it's single sided. */ |
| 670 | sz.side2 = 0; |
| 671 | |
| 672 | /* Test if it's a dual-sided DIMM. */ |
| 673 | if (dimm_banks > 1) { |
| 674 | /* Test if there's a second value. If so it's asymmetrical. */ |
| 675 | if (module_density != i) { |
| 676 | /* |
| 677 | * Find second value, picking up where we left off. |
| 678 | * i >>= 1 done initially to make sure we don't get |
| 679 | * the same value again. |
| 680 | */ |
| 681 | for (i >>= 1; i >= 0; i >>= 1) { |
| 682 | if (module_density == (sz.side1 | i)) { |
| 683 | sz.side2 = i; |
| 684 | break; |
| 685 | } |
| 686 | } |
| 687 | /* If not, it's symmetrical. */ |
| 688 | } else { |
| 689 | sz.side2 = sz.side1; |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * SPD byte 31 is the memory size divided by 4 so we |
| 695 | * need to muliply by 4 to get the total size. |
| 696 | */ |
| 697 | sz.side1 *= 4; |
| 698 | sz.side2 *= 4; |
| 699 | |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 700 | /* It is possible to partially use larger then supported |
| 701 | * modules by setting them to a supported size. |
| 702 | */ |
| 703 | if(sz.side1 > 128) { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 704 | PRINT_DEBUG("Side1 was %dMB but only 128MB will be used.\n", |
| 705 | sz.side1); |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 706 | sz.side1 = 128; |
| 707 | |
| 708 | if(sz.side2 > 128) { |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 709 | PRINT_DEBUG("Side2 was %dMB but only 128MB will be used.\n", |
| 710 | sz.side2); |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 711 | sz.side2 = 128; |
| 712 | } |
| 713 | } |
| 714 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 715 | return sz; |
| 716 | } |
| 717 | /* |
| 718 | * Sets DRAM attributes one DIMM at a time, based on SPD data. |
| 719 | * Northbridge settings that are set: NBXCFG[31:24], DRB0-DRB7, RPS, DRAMC. |
| 720 | */ |
| 721 | static void set_dram_row_attributes(void) |
| 722 | { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 723 | int i, dra, drb, col, width, value, rps; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 724 | u8 bpr; /* Top 8 bits of PGPOL */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 725 | u8 nbxecc = 0; /* NBXCFG[31:24] */ |
| 726 | u8 edo, sd, regsd; /* EDO, SDRAM, registered SDRAM */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 727 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 728 | edo = 0; |
| 729 | sd = 0; |
| 730 | regsd = 1; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 731 | rps = 0; |
| 732 | drb = 0; |
| 733 | bpr = 0; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 734 | |
| 735 | for (i = 0; i < DIMM_SOCKETS; i++) { |
| 736 | unsigned int device; |
Uwe Hermann | d773fd3 | 2010-11-20 20:23:08 +0000 | [diff] [blame] | 737 | device = DIMM0 + i; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 738 | bpr >>= 2; |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 739 | nbxecc >>= 2; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 740 | |
| 741 | /* First check if a DIMM is actually present. */ |
| 742 | value = spd_read_byte(device, SPD_MEMORY_TYPE); |
| 743 | /* This is 440BX! We do EDO too! */ |
| 744 | if (value == SPD_MEMORY_TYPE_EDO |
| 745 | || value == SPD_MEMORY_TYPE_SDRAM) { |
| 746 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 747 | if (value == SPD_MEMORY_TYPE_EDO) { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 748 | edo = 1; |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 749 | } else if (value == SPD_MEMORY_TYPE_SDRAM) { |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 750 | sd = 1; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 751 | } |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 752 | PRINT_DEBUG("Found DIMM in slot %d\n", i); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 753 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 754 | if (edo && sd) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 755 | printk(BIOS_ERR, "Mixing EDO/SDRAM unsupported!\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 756 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | /* "DRA" is our RPS for the two rows on this DIMM. */ |
| 760 | dra = 0; |
| 761 | |
| 762 | /* Columns */ |
| 763 | col = spd_read_byte(device, SPD_NUM_COLUMNS); |
| 764 | |
| 765 | /* |
| 766 | * Is this an ECC DIMM? Actually will be a 2 if so. |
| 767 | * TODO: Other register than NBXCFG also needs this |
| 768 | * ECC information. |
| 769 | */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 770 | value = spd_read_byte(device, SPD_DIMM_CONFIG_TYPE); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 771 | |
| 772 | /* Data width */ |
| 773 | width = spd_read_byte(device, SPD_MODULE_DATA_WIDTH_LSB); |
Anders Jenbo | 0e1e806 | 2010-04-27 06:35:31 +0000 | [diff] [blame] | 774 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 775 | /* Exclude error checking data width from page size calculations */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 776 | if (value) { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 777 | value = spd_read_byte(device, |
| 778 | SPD_ERROR_CHECKING_SDRAM_WIDTH); |
| 779 | width -= value; |
| 780 | /* ### ECC */ |
| 781 | /* Clear top 2 bits to help set up NBXCFG. */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 782 | nbxecc &= 0x3f; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 783 | } else { |
| 784 | /* Without ECC, top 2 bits should be 11. */ |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 785 | nbxecc |= 0xc0; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 786 | } |
| 787 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 788 | /* If any installed DIMM is *not* registered, this system cannot be |
| 789 | * configured for registered SDRAM. |
| 790 | * By registered, only the address and control lines need to be, which |
| 791 | * we can tell by reading SPD byte 21, bit 1. |
| 792 | */ |
| 793 | value = spd_read_byte(device, SPD_MODULE_ATTRIBUTES); |
| 794 | |
| 795 | PRINT_DEBUG("DIMM is "); |
| 796 | if ((value & MODULE_REGISTERED) == 0) { |
| 797 | regsd = 0; |
| 798 | PRINT_DEBUG("not "); |
| 799 | } |
| 800 | PRINT_DEBUG("registered\n"); |
| 801 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 802 | /* Calculate page size in bits. */ |
| 803 | value = ((1 << col) * width); |
| 804 | |
| 805 | /* Convert to KB. */ |
| 806 | dra = (value >> 13); |
| 807 | |
| 808 | /* Number of banks of DIMM (single or double sided). */ |
| 809 | value = spd_read_byte(device, SPD_NUM_DIMM_BANKS); |
| 810 | |
| 811 | /* Once we have dra, col is done and can be reused. |
| 812 | * So it's reused for number of banks. |
| 813 | */ |
| 814 | col = spd_read_byte(device, SPD_NUM_BANKS_PER_SDRAM); |
| 815 | |
| 816 | if (value == 1) { |
| 817 | /* |
| 818 | * Second bank of 1-bank DIMMs "doesn't have |
| 819 | * ECC" - or anything. |
| 820 | */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 821 | if (dra == 2) { |
| 822 | dra = 0x0; /* 2KB */ |
| 823 | } else if (dra == 4) { |
| 824 | dra = 0x1; /* 4KB */ |
| 825 | } else if (dra == 8) { |
| 826 | dra = 0x2; /* 8KB */ |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 827 | } else if (dra >= 16) { |
| 828 | /* Page sizes larger than supported are |
| 829 | * set to 8KB to use module partially. |
| 830 | */ |
| 831 | PRINT_DEBUG("Page size forced to 8KB.\n"); |
| 832 | dra = 0x2; /* 8KB */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 833 | } else { |
| 834 | dra = -1; |
| 835 | } |
| 836 | /* |
| 837 | * Sets a flag in PGPOL[BPR] if this DIMM has |
| 838 | * 4 banks per row. |
| 839 | */ |
| 840 | if (col == 4) |
| 841 | bpr |= 0x40; |
| 842 | } else if (value == 2) { |
| 843 | if (dra == 2) { |
| 844 | dra = 0x0; /* 2KB */ |
| 845 | } else if (dra == 4) { |
| 846 | dra = 0x05; /* 4KB */ |
| 847 | } else if (dra == 8) { |
| 848 | dra = 0x0a; /* 8KB */ |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 849 | } else if (dra >= 16) { |
| 850 | /* Ditto */ |
| 851 | PRINT_DEBUG("Page size forced to 8KB.\n"); |
| 852 | dra = 0x0a; /* 8KB */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 853 | } else { |
| 854 | dra = -1; |
| 855 | } |
| 856 | /* Ditto */ |
| 857 | if (col == 4) |
| 858 | bpr |= 0xc0; |
| 859 | } else { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 860 | printk(BIOS_ERR, "# of banks of DIMM unsupported!\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 861 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 862 | } |
| 863 | if (dra == -1) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 864 | printk(BIOS_ERR, "Page size not supported\n"); |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 865 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | /* |
| 869 | * 440BX supports asymmetrical dual-sided DIMMs, |
| 870 | * but can't handle DIMMs smaller than 8MB per |
Anders Jenbo | 771b0e4 | 2010-04-27 08:45:30 +0000 | [diff] [blame] | 871 | * side. |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 872 | */ |
| 873 | struct dimm_size sz = spd_get_dimm_size(device); |
| 874 | if ((sz.side1 < 8)) { |
Stefan Reinauer | 65b72ab | 2015-01-05 12:59:54 -0800 | [diff] [blame] | 875 | printk(BIOS_ERR, "DIMMs smaller than 8MB per side\n" |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 876 | "are not supported on this NB.\n"); |
| 877 | die("HALT\n"); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 878 | } |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 879 | |
| 880 | /* Divide size by 8 to set up the DRB registers. */ |
| 881 | drb += (sz.side1 / 8); |
| 882 | |
| 883 | /* |
| 884 | * Build the DRB for the next row in MSB so it gets |
| 885 | * placed in DRB[n+1] where it belongs when written |
| 886 | * as a 16-bit word. |
| 887 | */ |
| 888 | drb &= 0xff; |
| 889 | drb |= (drb + (sz.side2 / 8)) << 8; |
| 890 | } else { |
| 891 | #if 0 |
Stefan Reinauer | fc01e5e | 2010-12-27 14:31:05 +0000 | [diff] [blame] | 892 | PRINT_DEBUG("No DIMM found in slot %d\n", i); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 893 | #endif |
| 894 | |
| 895 | /* If there's no DIMM in the slot, set dra to 0x00. */ |
| 896 | dra = 0x00; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 897 | /* Still have to propagate DRB over. */ |
| 898 | drb &= 0xff; |
| 899 | drb |= (drb << 8); |
| 900 | } |
| 901 | |
| 902 | pci_write_config16(NB, DRB + (2 * i), drb); |
| 903 | #if 0 |
Stefan Reinauer | fc01e5e | 2010-12-27 14:31:05 +0000 | [diff] [blame] | 904 | PRINT_DEBUG("DRB has been set to 0x%04x\n", drb); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 905 | #endif |
| 906 | |
| 907 | /* Brings the upper DRB back down to be base for |
| 908 | * DRB calculations for the next two rows. |
| 909 | */ |
| 910 | drb >>= 8; |
| 911 | |
| 912 | rps |= (dra & 0x0f) << (i * 4); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | /* Set paging policy register. */ |
| 916 | pci_write_config8(NB, PGPOL + 1, bpr); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 917 | PRINT_DEBUG("PGPOL[BPR] has been set to 0x%02x\n", bpr); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 918 | |
| 919 | /* Set DRAM row page size register. */ |
| 920 | pci_write_config16(NB, RPS, rps); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 921 | PRINT_DEBUG("RPS has been set to 0x%04x\n", rps); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 922 | |
| 923 | /* ### ECC */ |
| 924 | pci_write_config8(NB, NBXCFG + 3, nbxecc); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 925 | 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] | 926 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 927 | /* Set DRAMC[4:3] to proper memory type (EDO/SDRAM/Registered SDRAM). */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 928 | |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 929 | /* i will be used to set DRAMC[4:3]. */ |
| 930 | if (regsd && sd) { |
| 931 | i = 0x10; // Registered SDRAM |
| 932 | } else if (sd) { |
| 933 | i = 0x08; // SDRAM |
| 934 | } else { |
| 935 | i = 0; // EDO |
| 936 | } |
| 937 | |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 938 | value = pci_read_config8(NB, DRAMC) & 0xe7; |
Keith Hui | e089a3f | 2011-08-02 22:28:14 -0400 | [diff] [blame] | 939 | value |= i; |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 940 | pci_write_config8(NB, DRAMC, value); |
Keith Hui | 09f5a74 | 2010-12-23 17:12:03 +0000 | [diff] [blame] | 941 | PRINT_DEBUG("DRAMC has been set to 0x%02x\n", value); |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 942 | } |
| 943 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 944 | void sdram_set_spd_registers(void) |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 945 | { |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 946 | /* Setup DRAM row boundary registers and other attributes. */ |
| 947 | set_dram_row_attributes(); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 948 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 949 | /* Setup DRAM buffer strength. */ |
Keith Hui | 59356ca | 2010-03-06 18:16:25 +0000 | [diff] [blame] | 950 | set_dram_buffer_strength(); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 951 | |
| 952 | /* TODO: Set PMCR? */ |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 953 | // pci_write_config8(NB, PMCR, 0x14); |
| 954 | pci_write_config8(NB, PMCR, 0x10); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 955 | |
Keith Hui | df35cdc | 2010-09-20 23:41:37 +0000 | [diff] [blame] | 956 | /* TODO: This is for EDO memory only. */ |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 957 | pci_write_config8(NB, DRAMT, 0x03); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 958 | } |
| 959 | |
Uwe Hermann | 115c5b9 | 2010-10-09 17:00:18 +0000 | [diff] [blame] | 960 | void sdram_enable(void) |
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 | int i; |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 963 | |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 964 | /* 0. Wait until power/voltages and clocks are stable (200us). */ |
| 965 | udelay(200); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 966 | |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 967 | /* 1. Apply NOP. Wait 200 clock cycles (200us should do). */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 968 | PRINT_DEBUG("RAM Enable 1: Apply NOP\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 969 | do_ram_command(RAM_COMMAND_NOP); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 970 | udelay(200); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 971 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 972 | /* 2. Precharge all. Wait tRP. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 973 | PRINT_DEBUG("RAM Enable 2: Precharge all\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 974 | do_ram_command(RAM_COMMAND_PRECHARGE); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 975 | udelay(1); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 976 | |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 977 | /* 3. Perform 8 refresh cycles. Wait tRC each time. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 978 | PRINT_DEBUG("RAM Enable 3: CBR\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 979 | for (i = 0; i < 8; i++) { |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 980 | do_ram_command(RAM_COMMAND_CBR); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 981 | udelay(1); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 982 | } |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 983 | |
| 984 | /* 4. Mode register set. Wait two memory cycles. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 985 | PRINT_DEBUG("RAM Enable 4: Mode register set\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 986 | do_ram_command(RAM_COMMAND_MRS); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 987 | udelay(2); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 988 | |
| 989 | /* 5. Normal operation. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 990 | PRINT_DEBUG("RAM Enable 5: Normal operation\n"); |
Uwe Hermann | 8b643cea | 2008-12-09 16:36:12 +0000 | [diff] [blame] | 991 | do_ram_command(RAM_COMMAND_NORMAL); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 992 | udelay(1); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 993 | |
| 994 | /* 6. Finally enable refresh. */ |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 995 | PRINT_DEBUG("RAM Enable 6: Enable refresh\n"); |
Uwe Hermann | 1683cef | 2008-11-27 00:47:07 +0000 | [diff] [blame] | 996 | // pci_write_config8(NB, PMCR, 0x10); |
| 997 | spd_enable_refresh(); |
Uwe Hermann | 861f964 | 2007-05-28 14:37:06 +0000 | [diff] [blame] | 998 | udelay(1); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 999 | |
Stefan Reinauer | 64ed2b7 | 2010-03-31 14:47:43 +0000 | [diff] [blame] | 1000 | PRINT_DEBUG("Northbridge following SDRAM init:\n"); |
Uwe Hermann | 1a9c892 | 2007-04-01 17:24:03 +0000 | [diff] [blame] | 1001 | DUMPNORTH(); |
Richard Smith | cb8eab4 | 2006-07-24 04:25:47 +0000 | [diff] [blame] | 1002 | } |