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
163 * 0x59 [3:0] Reserved
164 * 0x59 [5:4] 0xF0000 - 0xFFFFF BIOS area
165 * 0x5a [1:0] 0xC0000 - 0xC3FFF ISA add-on BIOS
166 * 0x5a [5:4] 0xC4000 - 0xC7FFF ISA add-on BIOS
167 * 0x5b [1:0] 0xC8000 - 0xCBFFF ISA add-on BIOS
168 * 0x5b [5:4] 0xCC000 - 0xCFFFF ISA add-on BIOS
169 * 0x5c [1:0] 0xD0000 - 0xD3FFF ISA add-on BIOS
170 * 0x5c [5:4] 0xD4000 - 0xD7FFF ISA add-on BIOS
171 * 0x5d [1:0] 0xD8000 - 0xDBFFF ISA add-on BIOS
172 * 0x5d [5:4] 0xDC000 - 0xDFFFF ISA add-on BIOS
173 * 0x5e [1:0] 0xE0000 - 0xE3FFF BIOS entension
174 * 0x5e [5:4] 0xE4000 - 0xE7FFF BIOS entension
175 * 0x5f [1:0] 0xE8000 - 0xEBFFF BIOS entension
176 * 0x5f [5:4] 0xEC000 - 0xEFFFF BIOS entension
179 * 00 = DRAM Disabled (all access goes to memory mapped I/O space)
180 * 01 = Read Only (Reads to DRAM, writes to memory mapped I/O space)
181 * 10 = Write Only (Writes to DRAM, reads to memory mapped I/O space)
182 * 11 = Read/Write (all access goes to DRAM)
193 /* DRB[0:7] - DRAM Row Boundary Registers
196 * An array of 8 byte registers, which hold the ending memory address
197 * assigned to each pair of DIMMs, in 8MB granularity.
199 * 0x60 DRB0 = Total memory in row0 (in 8 MB)
200 * 0x61 DRB1 = Total memory in row0+1 (in 8 MB)
201 * 0x62 DRB2 = Total memory in row0+1+2 (in 8 MB)
202 * 0x63 DRB3 = Total memory in row0+1+2+3 (in 8 MB)
203 * 0x64 DRB4 = Total memory in row0+1+2+3+4 (in 8 MB)
204 * 0x65 DRB5 = Total memory in row0+1+2+3+4+5 (in 8 MB)
205 * 0x66 DRB6 = Total memory in row0+1+2+3+4+5+6 (in 8 MB)
206 * 0x67 DRB7 = Total memory in row0+1+2+3+4+5+6+7 (in 8 MB)
208 /* Set the DRBs to zero for now, this will be fixed later. */
218 /* FDHC - Fixed DRAM Hole Control Register
221 * Controls two fixed DRAM holes: 512 KB - 640 KB and 15 MB - 16 MB.
223 * [7:6] Hole Enable (HEN)
225 * 01 = 512 KB - 640 KB (128 KB)
226 * 10 = 15 MB - 16 MB (1 MB)
230 /* No memory holes. */
233 /* RPS - SDRAM Row Page Size Register
236 * Sets the row page size for SDRAM. For EDO memory, the page
237 * size is fixed at 2 KB.
239 * [15:0] Page Size (PS)
245 /* SDRAMC - SDRAM Control Register
249 * [09:08] Idle/Pipeline DRAM Leadoff Timing (IPDLT)
251 * 01 = Add a clock delay to the lead-off clock count
254 * [07:05] SDRAM Mode Select (SMS)
255 * 000 = Normal SDRAM Operation (default)
256 * 001 = NOP Command Enable
257 * 010 = All Banks Precharge Enable
258 * 011 = Mode Register Set Enable
264 * 0 = 3 DIMM configuration
265 * 1 = 4 DIMM configuration
266 * [03:03] Leadoff Command Timing (LCT)
269 * [02:02] CAS# Latency (CL)
270 * 0 = 3 DCLK CAS# latency
271 * 1 = 2 DCLK CAS# latency
272 * [01:01] SDRAM RAS# to CAS# Delay (SRCD)
273 * 0 = 3 clocks between a row activate and a read or write cmd.
274 * 1 = 2 clocks between a row activate and a read or write cmd.
275 * [00:00] SDRAM RAS# Precharge (SRP)
276 * 0 = 3 clocks of RAS# precharge
277 * 1 = 2 clocks of RAS# precharge
279 SDRAMC, 0x0000, 0x0000,
281 /* PGPOL - Paging Policy Register
284 * [15:08] Banks per Row (BPR)
289 * [04:04] Intel Reserved
290 * [03:00] DRAM Idle Timer (DIT)
299 * 1xxx = Infinite (pages are not closed for idle condition)
302 PGPOL, 0x0000, 0xff00,
304 /* PMCR - Power Management Control Register
307 * [07:07] Power Down SDRAM Enable (PDSE)
310 * [06:06] ACPI Control Register Enable (SCRE)
312 * 0 = Disable (default)
313 * [05:05] Suspend Refresh Type (SRT)
314 * 1 = Self refresh mode
316 * [04:04] Normal Refresh Enable (NREF_EN)
319 * [03:03] Quick Start Mode (QSTART)
320 * 1 = Quick start mode for the processor is enabled
321 * [02:02] Gated Clock Enable (GCLKEN)
324 * [01:01] AGP Disable (AGP_DIS)
327 * [00:00] CPU reset without PCIRST enable (CRst_En)
331 /* Enable normal refresh and the gated clock. */
332 // TODO: Only do this later?
338 /*-----------------------------------------------------------------------------
339 SDRAM configuration functions.
340 -----------------------------------------------------------------------------*/
343 * Send the specified RAM command to all DIMMs.
345 * @param Memory controller
349 static void do_ram_command(const struct mem_controller *ctrl,
350 uint32_t command, uint32_t addr_offset)
355 /* TODO: Support for multiple DIMMs. */
357 /* Configure the RAM command. */
358 reg = pci_read_config16(ctrl->d0, SDRAMC);
359 reg &= 0xff1f; /* Clear bits 7-5. */
360 reg |= (uint16_t) (command << 5);
361 pci_write_config16(ctrl->d0, SDRAMC, reg);
363 /* RAM_COMMAND_NORMAL affects only the memory controller and
364 doesn't need to be "sent" to the DIMMs. */
365 /* if (command == RAM_COMMAND_NORMAL) return; */
367 PRINT_DEBUG(" Sending RAM command 0x");
368 PRINT_DEBUG_HEX16(reg);
369 PRINT_DEBUG(" to 0x");
370 PRINT_DEBUG_HEX32(0 + addr_offset); // FIXME
373 /* Read from (DIMM start address + addr_offset). */
374 read32(0 + addr_offset); // FIXME
377 /*-----------------------------------------------------------------------------
378 DIMM-independant configuration functions.
379 -----------------------------------------------------------------------------*/
384 * @param Memory controller
386 static void spd_enable_refresh(const struct mem_controller *ctrl)
391 reg = pci_read_config8(ctrl->d0, DRAMC);
393 for (i = 0; i < DIMM_SOCKETS; i++) {
394 value = spd_read_byte(ctrl->channel0[i], SPD_REFRESH);
397 reg = (reg & 0xf8) | refresh_rate_map[(value & 0x7f)];
399 PRINT_DEBUG(" Enabling refresh (DRAMC = 0x");
400 PRINT_DEBUG_HEX8(reg);
401 PRINT_DEBUG(") for DIMM ");
406 pci_write_config8(ctrl->d0, DRAMC, reg);
409 /*-----------------------------------------------------------------------------
411 -----------------------------------------------------------------------------*/
416 * @param Memory controller
418 static void sdram_set_registers(const struct mem_controller *ctrl)
423 PRINT_DEBUG("Northbridge prior to SDRAM init:\r\n");
426 max = sizeof(register_values) / sizeof(register_values[0]);
428 /* Set registers as specified in the register_values[] array. */
429 for (i = 0; i < max; i += 3) {
430 reg = pci_read_config32(ctrl->d0, register_values[i]);
431 reg &= register_values[i + 1];
432 reg |= register_values[i + 2] & ~(register_values[i + 1]);
433 pci_write_config32(ctrl->d0, register_values[i], reg);
435 PRINT_DEBUG(" Set register 0x");
436 PRINT_DEBUG_HEX32(register_values[i]);
437 PRINT_DEBUG(" to 0x");
438 PRINT_DEBUG_HEX32(reg);
446 * @param Memory controller
448 static void sdram_set_spd_registers(const struct mem_controller *ctrl)
450 /* TODO: Don't hardcode the values here, get info via SPD. */
452 /* Map all legacy regions to RAM (read/write). This is required if
453 * you want to use the RAM area from 768 KB - 1 MB. If the PAM
454 * registers are not set here appropriately, the RAM in that region
455 * will not be accessible, thus a RAM check of it will also fail.
457 pci_write_config8(ctrl->d0, PAM0, 0x30);
458 pci_write_config8(ctrl->d0, PAM1, 0x33);
459 pci_write_config8(ctrl->d0, PAM2, 0x33);
460 pci_write_config8(ctrl->d0, PAM3, 0x33);
461 pci_write_config8(ctrl->d0, PAM4, 0x33);
462 pci_write_config8(ctrl->d0, PAM5, 0x33);
463 pci_write_config8(ctrl->d0, PAM6, 0x33);
465 /* TODO: Set DRB0-DRB7. */
466 /* Currently this is hardcoded to one 64 MB DIMM in slot 0. */
467 pci_write_config8(ctrl->d0, DRB0, 0x08);
468 pci_write_config8(ctrl->d0, DRB1, 0x08);
469 pci_write_config8(ctrl->d0, DRB2, 0x08);
470 pci_write_config8(ctrl->d0, DRB3, 0x08);
471 pci_write_config8(ctrl->d0, DRB4, 0x08);
472 pci_write_config8(ctrl->d0, DRB5, 0x08);
473 pci_write_config8(ctrl->d0, DRB6, 0x08);
474 pci_write_config8(ctrl->d0, DRB7, 0x08);
476 /* TODO: Set DRAMC. Don't enable refresh for now. */
477 pci_write_config8(ctrl->d0, DRAMC, 0x08);
480 pci_write_config16(ctrl->d0, RPS, 0x0001);
482 /* TODO: Set SDRAMC. */
483 // pci_write_config16(ctrl->d0, SDRAMC, 0x0000);
485 /* TODO: Set PGPOL. */
486 pci_write_config16(ctrl->d0, PGPOL, 0x0107);
488 /* TODO: Set NBXCFG. */
489 // pci_write_config32(ctrl->d0, NBXCFG, 0x0100220c);
491 /* TODO: Set PMCR? */
492 // pci_write_config8(ctrl->d0, PMCR, 0x14);
493 // pci_write_config8(ctrl->d0, PMCR, 0x10);
496 // pci_write_config8(ctrl->d0, MLT, 0x40);
497 // pci_write_config8(ctrl->d0, DRAMT, 0x03);
498 // pci_write_config8(ctrl->d0, MBSC, 0x03);
499 // pci_write_config8(ctrl->d0, SCRR, 0x38);
505 * @param Number of controllers
506 * @param Memory controller
508 static void sdram_enable(int controllers, const struct mem_controller *ctrl)
512 /* 0. Wait until power/voltages and clocks are stable (200us). */
515 /* 1. Apply NOP. Wait 200 clock cycles (200us should do). */
516 PRINT_DEBUG("RAM Enable 1: Apply NOP\r\n");
517 do_ram_command(ctrl, RAM_COMMAND_NOP, 0);
520 /* 2. Precharge all. Wait tRP. */
521 PRINT_DEBUG("RAM Enable 2: Precharge all\r\n");
522 do_ram_command(ctrl, RAM_COMMAND_PRECHARGE, 0);
525 /* 3. Perform 8 refresh cycles. Wait tRC each time. */
526 PRINT_DEBUG("RAM Enable 3: CBR\r\n");
527 for (i = 0; i < 8; i++) {
528 do_ram_command(ctrl, RAM_COMMAND_CBR, 0);
532 /* 4. Mode register set. Wait two memory cycles. */
533 PRINT_DEBUG("RAM Enable 4: Mode register set\r\n");
534 do_ram_command(ctrl, RAM_COMMAND_MRS, 0x1d0);
537 /* 5. Normal operation. */
538 PRINT_DEBUG("RAM Enable 5: Normal operation\r\n");
539 do_ram_command(ctrl, RAM_COMMAND_NORMAL, 0);
542 /* 6. Finally enable refresh. */
543 PRINT_DEBUG("RAM Enable 6: Enable refresh\r\n");
544 // pci_write_config8(ctrl->d0, PMCR, 0x10);
545 spd_enable_refresh(ctrl);
548 PRINT_DEBUG("Northbridge following SDRAM init:\r\n");