2 * This file is part of the LinuxBIOS project.
4 * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <sdram_mode.h>
26 /*-----------------------------------------------------------------------------
27 Macros and definitions.
28 -----------------------------------------------------------------------------*/
30 /* Uncomment this to enable debugging output. */
31 #define DEBUG_RAM_SETUP 1
33 /* Debugging macros. */
34 #if defined(DEBUG_RAM_SETUP)
35 #define PRINT_DEBUG(x) print_debug(x)
36 #define PRINT_DEBUG_HEX8(x) print_debug_hex8(x)
37 #define PRINT_DEBUG_HEX16(x) print_debug_hex16(x)
38 #define PRINT_DEBUG_HEX32(x) print_debug_hex32(x)
39 #define DUMPNORTH() dump_pci_device(PCI_DEV(0, 0, 0))
41 #define PRINT_DEBUG(x)
42 #define PRINT_DEBUG_HEX8(x)
43 #define PRINT_DEBUG_HEX16(x)
44 #define PRINT_DEBUG_HEX32(x)
48 /* SDRAMC[7:5] - SDRAM Mode Select (SMS). */
49 #define RAM_COMMAND_NORMAL 0x0
50 #define RAM_COMMAND_NOP 0x1
51 #define RAM_COMMAND_PRECHARGE 0x2
52 #define RAM_COMMAND_MRS 0x3
53 #define RAM_COMMAND_CBR 0x4
55 /* Map the JEDEC SPD refresh rates (array index) to 440BX refresh rates as
56 * defined in DRAMC[2:0].
58 * [0] == Normal 15.625 us -> 15.6 us
59 * [1] == Reduced(.25X) 3.9 us -> 7.8 ns
60 * [2] == Reduced(.5X) 7.8 us -> 7.8 us
61 * [3] == Extended(2x) 31.3 us -> 31.2 us
62 * [4] == Extended(4x) 62.5 us -> 62.4 us
63 * [5] == Extended(8x) 125 us -> 124.8 us
65 static const uint32_t refresh_rate_map[] = {
69 /* Table format: register, bitmask, value. */
70 static const long register_values[] = {
71 /* NBXCFG - NBX Configuration Register
74 * [31:24] SDRAM Row Without ECC
75 * 0 = ECC components are populated in this row
76 * 1 = ECC components are not populated in this row
78 * [18:18] Host Bus Fast Data Ready Enable (HBFDRE)
79 * Assertion of DRAM data on host bus occurs...
80 * 0 = ...one clock after sampling snoop results (default)
81 * 1 = ...on the same clock the snoop result is being sampled
82 * (this mode is faster by one clock cycle)
83 * [17:17] ECC - EDO static Drive mode
84 * 0 = Normal mode (default)
85 * 1 = ECC signals are always driven
86 * [16:16] IDSEL_REDIRECT
87 * 0 = IDSEL1 is allocated to this bridge (default)
88 * 1 = IDSEL7 is allocated to this bridge
89 * [15:15] WSC# Handshake Disable
90 * 1 = Uni-processor mode
91 * 0 = Dual-processor mode with external IOAPIC (default)
92 * [14:14] Intel Reserved
93 * [13:12] Host/DRAM Frequency
98 * [11:11] AGP to PCI Access Enable
101 * [10:10] PCI Agent to Aperture Access Disable
103 * 0 = Enable (default)
104 * [09:09] Aperture Access Global Enable
107 * [08:07] DRAM Data Integrity Mode (DDIM)
111 * 11 = ECC Mode with hardware scrubbing enabled
112 * [06:06] ECC Diagnostic Mode Enable (EDME)
114 * 0 = Normal operation mode (default)
115 * [05:05] MDA Present (MDAP)
116 * Works in conjunction with the VGA_EN bit.
118 * 0 x All VGA cycles are sent to PCI
119 * 1 0 All VGA cycles are sent to AGP
120 * 1 1 All VGA cycles are sent to AGP, except for
121 * cycles in the MDA range.
123 * [03:03] USWC Write Post During I/O Bridge Access Enable (UWPIO)
126 * [02:02] In-Order Queue Depth (IOQD)
127 * 1 = In-order queue = maximum
128 * 0 = A7# is sampled asserted (i.e., 0)
132 NBXCFG, 0x00000000, 0xff00a00c,
134 /* DRAMC - DRAM Control Register
138 * [5:5] Module Mode Configuration (MMCONFIG)
140 * [4:3] DRAM Type (DT)
143 * 10 = Registered SDRAM
145 * Note: EDO, SDRAM and Registered SDRAM cannot be mixed.
146 * [2:0] DRAM Refresh Rate (DRR)
147 * 000 = Refresh disabled
156 /* Choose SDRAM (not registered), and disable refresh for now. */
160 * PAM[6:0] - Programmable Attribute Map Registers
162 * 0x59 [3:0] Reserved
163 * 0x59 [5:4] 0xF0000 - 0xFFFFF BIOS area
164 * 0x5a [1:0] 0xC0000 - 0xC3FFF ISA add-on BIOS
165 * 0x5a [5:4] 0xC4000 - 0xC7FFF ISA add-on BIOS
166 * 0x5b [1:0] 0xC8000 - 0xCBFFF ISA add-on BIOS
167 * 0x5b [5:4] 0xCC000 - 0xCFFFF ISA add-on BIOS
168 * 0x5c [1:0] 0xD0000 - 0xD3FFF ISA add-on BIOS
169 * 0x5c [5:4] 0xD4000 - 0xD7FFF ISA add-on BIOS
170 * 0x5d [1:0] 0xD8000 - 0xDBFFF ISA add-on BIOS
171 * 0x5d [5:4] 0xDC000 - 0xDFFFF ISA add-on BIOS
172 * 0x5e [1:0] 0xE0000 - 0xE3FFF BIOS entension
173 * 0x5e [5:4] 0xE4000 - 0xE7FFF BIOS entension
174 * 0x5f [1:0] 0xE8000 - 0xEBFFF BIOS entension
175 * 0x5f [5:4] 0xEC000 - 0xEFFFF BIOS entension
178 * 00 = DRAM Disabled (all access goes to memory mapped I/O space)
179 * 01 = Read Only (Reads to DRAM, writes to memory mapped I/O space)
180 * 10 = Write Only (Writes to DRAM, reads to memory mapped I/O space)
181 * 11 = Read/Write (all access goes to DRAM)
184 PAM0, 0x00000000, 0x00,
185 PAM1, 0x00000000, 0x00,
186 PAM2, 0x00000000, 0x00,
187 PAM3, 0x00000000, 0x00,
188 PAM4, 0x00000000, 0x00,
189 PAM5, 0x00000000, 0x00,
190 PAM6, 0x00000000, 0x00,
192 /* DRB[0:7] - DRAM Row Boundary Registers
195 * An array of 8 byte registers, which hold the ending memory address
196 * assigned to each pair of DIMMs, in 8MB granularity.
198 * 0x60 DRB0 = Total memory in row0 (in 8 MB)
199 * 0x61 DRB1 = Total memory in row0+1 (in 8 MB)
200 * 0x62 DRB2 = Total memory in row0+1+2 (in 8 MB)
201 * 0x63 DRB3 = Total memory in row0+1+2+3 (in 8 MB)
202 * 0x64 DRB4 = Total memory in row0+1+2+3+4 (in 8 MB)
203 * 0x65 DRB5 = Total memory in row0+1+2+3+4+5 (in 8 MB)
204 * 0x66 DRB6 = Total memory in row0+1+2+3+4+5+6 (in 8 MB)
205 * 0x67 DRB7 = Total memory in row0+1+2+3+4+5+6+7 (in 8 MB)
217 /* FDHC - Fixed DRAM Hole Control Register
220 * Controls two fixed DRAM holes: 512 KB - 640 KB and 15 MB - 16 MB.
222 * [7:6] Hole Enable (HEN)
224 * 01 = 512 KB - 640 KB (128 KB)
225 * 10 = 15 MB - 16 MB (1 MB)
229 /* No memory holes. */
232 /* RPS - SDRAM Row Page Size Register
235 * Sets the row page size for SDRAM. For EDO memory, the page
236 * size is fixed at 2 KB.
238 * [15:0] Page Size (PS)
244 /* SDRAMC - SDRAM Control Register
248 * [09:08] Idle/Pipeline DRAM Leadoff Timing (IPDLT)
250 * 01 = Add a clock delay to the lead-off clock count
253 * [07:05] SDRAM Mode Select (SMS)
254 * 000 = Normal SDRAM Operation (default)
255 * 001 = NOP Command Enable
256 * 010 = All Banks Precharge Enable
257 * 011 = Mode Register Set Enable
263 * 0 = 3 DIMM configuration
264 * 1 = 4 DIMM configuration
265 * [03:03] Leadoff Command Timing (LCT)
268 * [02:02] CAS# Latency (CL)
269 * 0 = 3 DCLK CAS# latency
270 * 1 = 2 DCLK CAS# latency
271 * [01:01] SDRAM RAS# to CAS# Delay (SRCD)
272 * 0 = 3 clocks between a row activate and a read or write cmd.
273 * 1 = 2 clocks between a row activate and a read or write cmd.
274 * [00:00] SDRAM RAS# Precharge (SRP)
275 * 0 = 3 clocks of RAS# precharge
276 * 1 = 2 clocks of RAS# precharge
278 SDRAMC, 0x0000, 0x0000,
280 /* PGPOL - Paging Policy Register
283 * [15:08] Banks per Row (BPR)
288 * [04:04] Intel Reserved
289 * [03:00] DRAM Idle Timer (DIT)
298 * 1xxx = Infinite (pages are not closed for idle condition)
301 PGPOL, 0x0000, 0xff00,
303 /* PMCR - Power Management Control Register
306 * [07:07] Power Down SDRAM Enable (PDSE)
309 * [06:06] ACPI Control Register Enable (SCRE)
311 * 0 = Disable (default)
312 * [05:05] Suspend Refresh Type (SRT)
313 * 1 = Self refresh mode
315 * [04:04] Normal Refresh Enable (NREF_EN)
318 * [03:03] Quick Start Mode (QSTART)
319 * 1 = Quick start mode for the processor is enabled
320 * [02:02] Gated Clock Enable (GCLKEN)
323 * [01:01] AGP Disable (AGP_DIS)
326 * [00:00] CPU reset without PCIRST enable (CRst_En)
330 /* Enable normal refresh and the gated clock. */
331 // TODO: Only do this later?
337 /*-----------------------------------------------------------------------------
338 SDRAM configuration functions.
339 -----------------------------------------------------------------------------*/
342 * Send the specified RAM command to all DIMMs.
344 * @param Memory controller
348 static void do_ram_command(const struct mem_controller *ctrl,
349 uint32_t command, uint32_t addr_offset)
354 /* TODO: Support for multiple DIMMs. */
356 /* Configure the RAM command. */
357 reg = pci_read_config16(ctrl->d0, SDRAMC);
358 reg &= 0xff1f; /* Clear bits 7-5. */
359 reg |= (uint16_t) (command << 5);
360 pci_write_config16(ctrl->d0, SDRAMC, reg);
362 /* RAM_COMMAND_NORMAL affects only the memory controller and
363 doesn't need to be "sent" to the DIMMs. */
364 /* if (command == RAM_COMMAND_NORMAL) return; */
366 PRINT_DEBUG(" Sending RAM command 0x");
367 PRINT_DEBUG_HEX16(reg);
368 PRINT_DEBUG(" to 0x");
369 PRINT_DEBUG_HEX32(0 + addr_offset); // FIXME
372 /* Read from (DIMM start address + addr_offset). */
373 read32(0 + addr_offset); // FIXME
376 /*-----------------------------------------------------------------------------
377 DIMM-independant configuration functions.
378 -----------------------------------------------------------------------------*/
383 * @param Memory controller
385 static void spd_enable_refresh(const struct mem_controller *ctrl)
390 reg = pci_read_config8(ctrl->d0, DRAMC);
392 for (i = 0; i < DIMM_SOCKETS; i++) {
393 value = spd_read_byte(ctrl->channel0[i], SPD_REFRESH);
396 reg = (reg & 0xf8) | refresh_rate_map[(value & 0x7f)];
398 PRINT_DEBUG(" Enabling refresh (DRAMC = 0x");
399 PRINT_DEBUG_HEX8(reg);
400 PRINT_DEBUG(") for DIMM ");
405 pci_write_config8(ctrl->d0, DRAMC, reg);
408 /*-----------------------------------------------------------------------------
410 -----------------------------------------------------------------------------*/
415 * @param Memory controller
417 static void sdram_set_registers(const struct mem_controller *ctrl)
422 PRINT_DEBUG("Northbridge prior to SDRAM init:\r\n");
425 max = sizeof(register_values) / sizeof(register_values[0]);
427 /* Set registers as specified in the register_values array. */
428 for (i = 0; i < max; i += 3) {
429 reg = pci_read_config32(ctrl->d0, register_values[i]);
430 reg &= register_values[i + 1];
431 reg |= register_values[i + 2] & ~(register_values[i + 1]);
432 pci_write_config32(ctrl->d0, register_values[i], reg);
434 PRINT_DEBUG(" Set register 0x");
435 PRINT_DEBUG_HEX32(register_values[i]);
436 PRINT_DEBUG(" to 0x");
437 PRINT_DEBUG_HEX32(reg);
445 * @param Memory controller
447 static void sdram_set_spd_registers(const struct mem_controller *ctrl)
449 /* TODO: Don't hardcode the values here, get info via SPD. */
451 /* TODO: Set DRB0-DRB7. */
452 pci_write_config8(ctrl->d0, DRB0, 0x08);
453 pci_write_config8(ctrl->d0, DRB1, 0x08);
454 pci_write_config8(ctrl->d0, DRB2, 0x08);
455 pci_write_config8(ctrl->d0, DRB3, 0x08);
456 pci_write_config8(ctrl->d0, DRB4, 0x08);
457 pci_write_config8(ctrl->d0, DRB5, 0x08);
458 pci_write_config8(ctrl->d0, DRB6, 0x08);
459 pci_write_config8(ctrl->d0, DRB7, 0x08);
461 /* TODO: Set DRAMC. Don't enable refresh for now. */
462 pci_write_config8(ctrl->d0, DRAMC, 0x08);
465 pci_write_config16(ctrl->d0, RPS, 0x0001);
467 /* TODO: Set SDRAMC. */
468 // pci_write_config16(ctrl->d0, SDRAMC, 0x0000);
470 /* TODO: Set PGPOL. */
471 pci_write_config16(ctrl->d0, PGPOL, 0x0107);
473 /* TODO: Set NBXCFG. */
474 // pci_write_config32(ctrl->d0, NBXCFG, 0x0100220c);
476 /* TODO: Set PMCR? */
477 // pci_write_config8(ctrl->d0, PMCR, 0x14);
478 // pci_write_config8(ctrl->d0, PMCR, 0x10);
481 // pci_write_config8(ctrl->d0, MLT, 0x40);
482 // pci_write_config8(ctrl->d0, DRAMT, 0x03);
483 // pci_write_config8(ctrl->d0, MBSC, 0x03);
484 // pci_write_config8(ctrl->d0, SCRR, 0x38);
490 * @param Number of controllers
491 * @param Memory controller
493 static void sdram_enable(int controllers, const struct mem_controller *ctrl)
497 /* TODO: Use a delay here? Needed? */
500 /* TODO: How long should the delays be? Fix later. */
503 PRINT_DEBUG("RAM Enable 1: Apply NOP\r\n");
504 do_ram_command(ctrl, RAM_COMMAND_NOP, 0);
507 /* 2. Precharge all. Wait tRP. */
508 PRINT_DEBUG("RAM Enable 2: Precharge all\r\n");
509 do_ram_command(ctrl, RAM_COMMAND_PRECHARGE, 0);
512 /* 3. Perform 8 refresh cycles. Wait tRC each time. */
513 PRINT_DEBUG("RAM Enable 3: CBR\r\n");
514 for (i = 0; i < 8; i++) {
515 do_ram_command(ctrl, RAM_COMMAND_CBR, 0);
519 /* 4. Mode register set. Wait two memory cycles. */
520 PRINT_DEBUG("RAM Enable 4: Mode register set\r\n");
521 do_ram_command(ctrl, RAM_COMMAND_MRS, 0x1d0);
525 /* 5. Normal operation. */
526 PRINT_DEBUG("RAM Enable 5: Normal operation\r\n");
527 do_ram_command(ctrl, RAM_COMMAND_NORMAL, 0);
530 /* 6. Finally enable refresh. */
531 PRINT_DEBUG("RAM Enable 6: Enable refresh\r\n");
532 // pci_write_config8(ctrl->d0, PMCR, 0x10);
533 spd_enable_refresh(ctrl);
536 PRINT_DEBUG("Northbridge following SDRAM init:\r\n");