2 * This file is part of the coreboot project.
4 * Copyright (C) 2007-2008 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>
27 /*-----------------------------------------------------------------------------
28 Macros and definitions.
29 -----------------------------------------------------------------------------*/
31 /* Debugging macros. */
32 #if CONFIG_DEBUG_RAM_SETUP
33 #define PRINT_DEBUG(x) print_debug(x)
34 #define PRINT_DEBUG_HEX8(x) print_debug_hex8(x)
35 #define PRINT_DEBUG_HEX16(x) print_debug_hex16(x)
36 #define PRINT_DEBUG_HEX32(x) print_debug_hex32(x)
37 #define DUMPNORTH() dump_pci_device(PCI_DEV(0, 0, 0))
39 #define PRINT_DEBUG(x)
40 #define PRINT_DEBUG_HEX8(x)
41 #define PRINT_DEBUG_HEX16(x)
42 #define PRINT_DEBUG_HEX32(x)
46 #define NB PCI_DEV(0, 0, 0)
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 + 0, 0x00, 0x0c,
133 // NBXCFG + 1, 0x00, 0xa0,
134 NBXCFG + 1, 0x00, 0x80,
135 NBXCFG + 2, 0x00, 0x00,
136 NBXCFG + 3, 0x00, 0xff,
138 /* DRAMC - DRAM Control Register
142 * [5:5] Module Mode Configuration (MMCONFIG)
144 * [4:3] DRAM Type (DT)
147 * 10 = Registered SDRAM
149 * Note: EDO, SDRAM and Registered SDRAM cannot be mixed.
150 * [2:0] DRAM Refresh Rate (DRR)
151 * 000 = Refresh disabled
160 /* Choose SDRAM (not registered), and disable refresh for now. */
164 * PAM[6:0] - Programmable Attribute Map Registers
167 * 0x59 [3:0] Reserved
168 * 0x59 [5:4] 0xF0000 - 0xFFFFF BIOS area
169 * 0x5a [1:0] 0xC0000 - 0xC3FFF ISA add-on BIOS
170 * 0x5a [5:4] 0xC4000 - 0xC7FFF ISA add-on BIOS
171 * 0x5b [1:0] 0xC8000 - 0xCBFFF ISA add-on BIOS
172 * 0x5b [5:4] 0xCC000 - 0xCFFFF ISA add-on BIOS
173 * 0x5c [1:0] 0xD0000 - 0xD3FFF ISA add-on BIOS
174 * 0x5c [5:4] 0xD4000 - 0xD7FFF ISA add-on BIOS
175 * 0x5d [1:0] 0xD8000 - 0xDBFFF ISA add-on BIOS
176 * 0x5d [5:4] 0xDC000 - 0xDFFFF ISA add-on BIOS
177 * 0x5e [1:0] 0xE0000 - 0xE3FFF BIOS entension
178 * 0x5e [5:4] 0xE4000 - 0xE7FFF BIOS entension
179 * 0x5f [1:0] 0xE8000 - 0xEBFFF BIOS entension
180 * 0x5f [5:4] 0xEC000 - 0xEFFFF BIOS entension
183 * 00 = DRAM Disabled (all access goes to memory mapped I/O space)
184 * 01 = Read Only (Reads to DRAM, writes to memory mapped I/O space)
185 * 10 = Write Only (Writes to DRAM, reads to memory mapped I/O space)
186 * 11 = Read/Write (all access goes to DRAM)
197 /* DRB[0:7] - DRAM Row Boundary Registers
200 * An array of 8 byte registers, which hold the ending memory address
201 * assigned to each pair of DIMMs, in 8MB granularity.
203 * 0x60 DRB0 = Total memory in row0 (in 8 MB)
204 * 0x61 DRB1 = Total memory in row0+1 (in 8 MB)
205 * 0x62 DRB2 = Total memory in row0+1+2 (in 8 MB)
206 * 0x63 DRB3 = Total memory in row0+1+2+3 (in 8 MB)
207 * 0x64 DRB4 = Total memory in row0+1+2+3+4 (in 8 MB)
208 * 0x65 DRB5 = Total memory in row0+1+2+3+4+5 (in 8 MB)
209 * 0x66 DRB6 = Total memory in row0+1+2+3+4+5+6 (in 8 MB)
210 * 0x67 DRB7 = Total memory in row0+1+2+3+4+5+6+7 (in 8 MB)
212 /* Set the DRBs to zero for now, this will be fixed later. */
222 /* FDHC - Fixed DRAM Hole Control Register
225 * Controls two fixed DRAM holes: 512 KB - 640 KB and 15 MB - 16 MB.
227 * [7:6] Hole Enable (HEN)
229 * 01 = 512 KB - 640 KB (128 KB)
230 * 10 = 15 MB - 16 MB (1 MB)
234 /* No memory holes. */
237 /* RPS - SDRAM Row Page Size Register
240 * Sets the row page size for SDRAM. For EDO memory, the page
241 * size is fixed at 2 KB.
243 * [15:0] Page Size (PS)
250 /* SDRAMC - SDRAM Control Register
254 * [09:08] Idle/Pipeline DRAM Leadoff Timing (IPDLT)
256 * 01 = Add a clock delay to the lead-off clock count
259 * [07:05] SDRAM Mode Select (SMS)
260 * 000 = Normal SDRAM Operation (default)
261 * 001 = NOP Command Enable
262 * 010 = All Banks Precharge Enable
263 * 011 = Mode Register Set Enable
269 * 0 = 3 DIMM configuration
270 * 1 = 4 DIMM configuration
271 * [03:03] Leadoff Command Timing (LCT)
274 * [02:02] CAS# Latency (CL)
275 * 0 = 3 DCLK CAS# latency
276 * 1 = 2 DCLK CAS# latency
277 * [01:01] SDRAM RAS# to CAS# Delay (SRCD)
278 * 0 = 3 clocks between a row activate and a read or write cmd.
279 * 1 = 2 clocks between a row activate and a read or write cmd.
280 * [00:00] SDRAM RAS# Precharge (SRP)
281 * 0 = 3 clocks of RAS# precharge
282 * 1 = 2 clocks of RAS# precharge
284 SDRAMC + 0, 0x00, 0x00,
285 SDRAMC + 1, 0x00, 0x00,
287 /* PGPOL - Paging Policy Register
290 * [15:08] Banks per Row (BPR)
295 * [04:04] Intel Reserved
296 * [03:00] DRAM Idle Timer (DIT)
305 * 1xxx = Infinite (pages are not closed for idle condition)
308 PGPOL + 0, 0x00, 0x00,
309 PGPOL + 1, 0x00, 0xff,
311 /* PMCR - Power Management Control Register
314 * [07:07] Power Down SDRAM Enable (PDSE)
317 * [06:06] ACPI Control Register Enable (SCRE)
319 * 0 = Disable (default)
320 * [05:05] Suspend Refresh Type (SRT)
321 * 1 = Self refresh mode
323 * [04:04] Normal Refresh Enable (NREF_EN)
326 * [03:03] Quick Start Mode (QSTART)
327 * 1 = Quick start mode for the processor is enabled
328 * [02:02] Gated Clock Enable (GCLKEN)
331 * [01:01] AGP Disable (AGP_DIS)
334 * [00:00] CPU reset without PCIRST enable (CRst_En)
338 /* Enable normal refresh and the gated clock. */
339 // TODO: Only do this later?
345 /*-----------------------------------------------------------------------------
346 SDRAM configuration functions.
347 -----------------------------------------------------------------------------*/
350 * Send the specified RAM command to all DIMMs.
352 * @param command The RAM command to send to the DIMM(s).
354 static void do_ram_command(u32 command)
357 u8 dimm_start, dimm_end;
359 u32 addr, addr_offset;
361 /* Configure the RAM command. */
362 reg16 = pci_read_config16(NB, SDRAMC);
363 reg16 &= 0xff1f; /* Clear bits 7-5. */
364 reg16 |= (u16) (command << 5); /* Write command into bits 7-5. */
365 pci_write_config16(NB, SDRAMC, reg16);
368 * RAM_COMMAND_NORMAL affects only the memory controller and
369 * doesn't need to be "sent" to the DIMMs.
371 if (command == RAM_COMMAND_NORMAL)
374 /* Send the RAM command to each row of memory. */
376 for (i = 0; i < (DIMM_SOCKETS * 2); i++) {
378 caslatency = 3; /* TODO: Dynamically get CAS latency later. */
379 if (command == RAM_COMMAND_MRS) {
381 * MAA[12:11,9:0] must be inverted when sent to DIMM
382 * 2 or 3 (no inversion if sent to DIMM 0 or 1).
384 if ((i >= 0 && i <= 3) && caslatency == 3)
386 if ((i >= 4 && i <= 7) && caslatency == 3)
387 addr_offset = 0x1e28;
388 if ((i >= 0 && i <= 3) && caslatency == 2)
390 if ((i >= 4 && i <= 7) && caslatency == 2)
391 addr_offset = 0x1ea8;
394 dimm_end = pci_read_config8(NB, DRB + i);
396 addr = (dimm_start * 8 * 1024 * 1024) + addr_offset;
397 if (dimm_end > dimm_start) {
399 PRINT_DEBUG(" Sending RAM command 0x");
400 PRINT_DEBUG_HEX16(reg16);
401 PRINT_DEBUG(" to 0x");
402 PRINT_DEBUG_HEX32(addr);
409 /* Set the start of the next DIMM. */
410 dimm_start = dimm_end;
414 /*-----------------------------------------------------------------------------
415 DIMM-independant configuration functions.
416 -----------------------------------------------------------------------------*/
418 static void spd_enable_refresh(void)
423 reg = pci_read_config8(NB, DRAMC);
425 for (i = 0; i < DIMM_SOCKETS; i++) {
426 value = spd_read_byte(DIMM_SPD_BASE + i, SPD_REFRESH);
429 reg = (reg & 0xf8) | refresh_rate_map[(value & 0x7f)];
431 PRINT_DEBUG(" Enabling refresh (DRAMC = 0x");
432 PRINT_DEBUG_HEX8(reg);
433 PRINT_DEBUG(") for DIMM ");
438 pci_write_config8(NB, DRAMC, reg);
441 /*-----------------------------------------------------------------------------
443 -----------------------------------------------------------------------------*/
445 static void sdram_set_registers(void)
450 PRINT_DEBUG("Northbridge prior to SDRAM init:\r\n");
453 max = ARRAY_SIZE(register_values);
455 /* Set registers as specified in the register_values[] array. */
456 for (i = 0; i < max; i += 3) {
457 reg = pci_read_config8(NB, register_values[i]);
458 reg &= register_values[i + 1];
459 reg |= register_values[i + 2] & ~(register_values[i + 1]);
460 pci_write_config8(NB, register_values[i], reg);
462 PRINT_DEBUG(" Set register 0x");
463 PRINT_DEBUG_HEX8(register_values[i]);
464 PRINT_DEBUG(" to 0x");
465 PRINT_DEBUG_HEX8(reg);
470 static void sdram_set_spd_registers(void)
472 /* TODO: Don't hardcode the values here, get info via SPD. */
474 /* Map all legacy regions to RAM (read/write). This is required if
475 * you want to use the RAM area from 768 KB - 1 MB. If the PAM
476 * registers are not set here appropriately, the RAM in that region
477 * will not be accessible, thus a RAM check of it will also fail.
479 pci_write_config8(NB, PAM0, 0x30);
480 pci_write_config8(NB, PAM1, 0x33);
481 pci_write_config8(NB, PAM2, 0x33);
482 pci_write_config8(NB, PAM3, 0x33);
483 pci_write_config8(NB, PAM4, 0x33);
484 pci_write_config8(NB, PAM5, 0x33);
485 pci_write_config8(NB, PAM6, 0x33);
487 /* TODO: Set DRB0-DRB7. */
488 /* Currently this is hardcoded to one 64 MB DIMM in slot 0. */
489 pci_write_config8(NB, DRB0, 0x08);
490 pci_write_config8(NB, DRB1, 0x08);
491 pci_write_config8(NB, DRB2, 0x08);
492 pci_write_config8(NB, DRB3, 0x08);
493 pci_write_config8(NB, DRB4, 0x08);
494 pci_write_config8(NB, DRB5, 0x08);
495 pci_write_config8(NB, DRB6, 0x08);
496 pci_write_config8(NB, DRB7, 0x08);
498 /* TODO: Set DRAMC. Don't enable refresh for now. */
499 pci_write_config8(NB, DRAMC, 0x08);
501 /* TODO: Set RPS. Needs to be fixed for multiple DIMM support. */
502 pci_write_config16(NB, RPS, 0x0001);
504 /* TODO: Set SDRAMC. */
505 pci_write_config16(NB, SDRAMC, 0x0010); /* SDRAMPWR=1: 4 DIMM config */
507 /* TODO: Set PGPOL. */
508 // pci_write_config16(NB, PGPOL, 0x0107);
509 pci_write_config16(NB, PGPOL, 0x0123);
511 /* TODO: Set NBXCFG. */
512 // pci_write_config32(NB, NBXCFG, 0x0100220c); // FIXME?
513 pci_write_config32(NB, NBXCFG, 0xff00800c);
515 /* TODO: Set PMCR? */
516 // pci_write_config8(NB, PMCR, 0x14);
517 pci_write_config8(NB, PMCR, 0x10);
520 pci_write_config8(NB, PCI_LATENCY_TIMER, 0x40);
521 pci_write_config8(NB, DRAMT, 0x03);
522 pci_write_config8(NB, MBSC, 0x03);
523 pci_write_config8(NB, SCRR, 0x38);
526 static void sdram_enable(void)
530 /* 0. Wait until power/voltages and clocks are stable (200us). */
533 /* 1. Apply NOP. Wait 200 clock cycles (200us should do). */
534 PRINT_DEBUG("RAM Enable 1: Apply NOP\r\n");
535 do_ram_command(RAM_COMMAND_NOP);
538 /* 2. Precharge all. Wait tRP. */
539 PRINT_DEBUG("RAM Enable 2: Precharge all\r\n");
540 do_ram_command(RAM_COMMAND_PRECHARGE);
543 /* 3. Perform 8 refresh cycles. Wait tRC each time. */
544 PRINT_DEBUG("RAM Enable 3: CBR\r\n");
545 for (i = 0; i < 8; i++) {
546 do_ram_command(RAM_COMMAND_CBR);
550 /* 4. Mode register set. Wait two memory cycles. */
551 PRINT_DEBUG("RAM Enable 4: Mode register set\r\n");
552 do_ram_command(RAM_COMMAND_MRS);
555 /* 5. Normal operation. */
556 PRINT_DEBUG("RAM Enable 5: Normal operation\r\n");
557 do_ram_command(RAM_COMMAND_NORMAL);
560 /* 6. Finally enable refresh. */
561 PRINT_DEBUG("RAM Enable 6: Enable refresh\r\n");
562 // pci_write_config8(NB, PMCR, 0x10);
563 spd_enable_refresh();
566 PRINT_DEBUG("Northbridge following SDRAM init:\r\n");