2 * This file is part of the coreboot project.
4 * Copyright (C) 2007-2009 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
6 * Copyright (C) 2008-2009 Elia Yehuda <z4ziggy@gmail.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #include <arch/romcc_io.h>
28 #include <device/pci_def.h>
29 #include <console/console.h>
33 /*-----------------------------------------------------------------------------
34 Macros and definitions.
35 -----------------------------------------------------------------------------*/
37 /* Debugging macros. */
38 #define HAVE_ENOUGH_REGISTERS 0 /* Don't have enough registers to compile all
39 * debugging code with ROMCC
41 #if CONFIG_DEBUG_RAM_SETUP
42 #define PRINT_DEBUG(x) print_debug(x)
43 #define PRINT_DEBUG_HEX8(x) print_debug_hex8(x)
44 #define PRINT_DEBUG_HEX16(x) print_debug_hex16(x)
45 #define PRINT_DEBUG_HEX32(x) print_debug_hex32(x)
46 // no dump_pci_device in src/northbridge/intel/i82810/
47 // #define DUMPNORTH() dump_pci_device(PCI_DEV(0, 0, 0))
50 #define PRINT_DEBUG(x)
51 #define PRINT_DEBUG_HEX8(x)
52 #define PRINT_DEBUG_HEX16(x)
53 #define PRINT_DEBUG_HEX32(x)
57 /* DRAMT[7:5] - SDRAM Mode Select (SMS). */
58 #define RAM_COMMAND_SELF_REFRESH 0x0 /* Disable refresh */
59 #define RAM_COMMAND_NORMAL 0x1 /* Refresh: 15.6/11.7us for 100/133MHz */
60 #define RAM_COMMAND_NORMAL_FR 0x2 /* Refresh: 7.8/5.85us for 100/133MHz */
61 #define RAM_COMMAND_NOP 0x4 /* NOP command */
62 #define RAM_COMMAND_PRECHARGE 0x5 /* All bank precharge */
63 #define RAM_COMMAND_MRS 0x6 /* Mode register set */
64 #define RAM_COMMAND_CBR 0x7 /* CBR */
67 * This table is used to translate the value read from SPD Byte 31 to a value
68 * the northbridge can understand in DRP, aka Rx52[7:4], [3:0]. Where most
69 * northbridges have some sort of simple calculation that can be done for this,
70 * I haven't yet figured out one for this northbridge. Until someone does,
71 * this table is necessary.
73 static const u8 translate_spd_to_i82810[] = {
74 /* Note: 4MB sizes are not supported, so dual-sided DIMMs with a 4MB
75 * side can't be either, at least for now.
77 /* TODO: For above case, only use the other side if > 4MB, and get some
78 * of these DIMMs to test it with. Same for unsupported 128/x sizes.
81 /* SPD Byte 31 Memory Size [Side 1/2] */
82 0xff, /* 0x01 No memory */
86 0x04, /* 0x04 16/0 or 16 */
89 0xff, /* 0x07 Invalid */
90 0x07, /* 0x08 32/0 or 32 */
93 0xff, /* 0x0B Invalid */
94 0x08, /* 0x0C 32/16 */
95 0xff, 0xff, 0xff, /* 0x0D-0F Invalid */
96 0x0a, /* 0x10 64/0 or 64 */
99 0xff, /* 0x13 Invalid */
100 0xff, /* 0x14 64/16 */
101 0xff, 0xff, 0xff, /* 0x15-17 Invalid */
102 0x0b, /* 0x18 64/32 */
103 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x19-1f Invalid */
104 0x0d, /* 0x20 128/0 or 128 */
105 /* These configurations are not supported by the i810 */
106 0xff, /* 0x21 128/4 */
107 0xff, /* 0x22 128/8 */
108 0xff, /* 0x23 Invalid */
109 0xff, /* 0x24 128/16 */
110 0xff, 0xff, 0xff, /* 0x25-27 Invalid */
111 0xff, /* 0x28 128/32 */
112 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 0x29-2f Invalid */
113 0x0e, /* 0x30 128/64 */
114 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
115 0xff, 0xff, 0xff, /* 0x31-3f Invalid */
116 0x0f, /* 0x40 256/0 or 256 */
117 /* Anything larger is not supported by the 82810. */
121 * Table which returns the RAM size in MB when fed the DRP[7:4] or [3:0] value.
122 * Note that 2 is a value which the DRP should never be programmed to.
123 * Some size values appear twice, due to single-sided vs dual-sided banks.
125 static const u16 translate_i82810_to_mb[] = {
126 /* DRP 0 1 (2) 3 4 5 6 7 8 9 A B C D E F */
127 /* MB */0, 8, 0, 16, 16, 24, 32, 32, 48, 64, 64, 96, 128, 128, 192, 256,
130 /* Size of bank#0 for dual-sided DIMMs */
131 static const u8 translate_i82810_to_bank[] = {
132 /* DRP 0 1 (2) 3 4 5 6 7 8 9 A B C D E F */
133 /* MB */0, 0, 0, 8, 0, 16, 16, 0, 32, 32, 0, 64, 64, 0, 128, 128,
137 u8 ds; /* dual-sided */
138 u8 ss; /* single-sided */
142 /*-----------------------------------------------------------------------------
143 SDRAM configuration functions.
144 -----------------------------------------------------------------------------*/
146 static inline int spd_read_byte(unsigned device, unsigned address)
148 return smbus_read_byte(device, address);
152 * Send the specified RAM command to all DIMMs.
154 * @param The RAM command to send to the DIMM(s).
156 static void do_ram_command(u8 command)
158 u32 addr, addr_offset;
159 u16 dimm_size, dimm_start, dimm_bank;
163 /* Configure the RAM command. */
164 reg8 = pci_read_config8(PCI_DEV(0, 0, 0), DRAMT);
165 reg8 &= 0x1f; /* Clear bits 7-5. */
166 reg8 |= command << 5;
167 pci_write_config8(PCI_DEV(0, 0, 0), DRAMT, reg8);
170 * RAM_COMMAND_NORMAL affects only the memory controller and
171 * doesn't need to be "sent" to the DIMMs.
173 if (command == RAM_COMMAND_NORMAL)
177 for (i = 0; i < DIMM_SOCKETS; i++) {
179 * Calculate the address offset where we need to "send" the
180 * DIMM command to. For most commands the offset is 0, only
181 * RAM_COMMAND_MRS needs special values, see below.
182 * The final address offset bits depend on three things:
184 * (1) Some hardcoded values specified in the datasheet.
185 * (2) Which CAS latency we will use/set. This is the SMAA[4]
186 * bit, which is 1 for CL3, and 0 for CL2. The bitstring
187 * so far has the form '00000001X1010', X being SMAA[4].
188 * (3) The DIMM to which we want to send the command. For
189 * DIMM0 no special handling is needed, but for DIMM1 we
190 * must invert the four bits SMAA[7:4] (see datasheet).
192 * Finally, the bitstring has to be shifted 3 bits to the left.
193 * See i810 datasheet pages 43, 85, and 86 for details.
196 caslatency = 3; /* TODO: Dynamically get CAS latency later. */
197 if (i == 0 && command == RAM_COMMAND_MRS && caslatency == 3)
198 addr_offset = 0x1d0; /* DIMM0, CL3, 0000111010000 */
199 if (i == 1 && command == RAM_COMMAND_MRS && caslatency == 3)
200 addr_offset = 0x650; /* DIMM1, CL3, 0011001010000 */
201 if (i == 0 && command == RAM_COMMAND_MRS && caslatency == 2)
202 addr_offset = 0x150; /* DIMM0, CL2, 0000101010000 */
203 if (i == 1 && command == RAM_COMMAND_MRS && caslatency == 2)
204 addr_offset = 0x1a0; /* DIMM1, CL2, 0000110100000 */
206 drp = pci_read_config8(PCI_DEV(0, 0, 0), DRP);
207 drp = (drp >> (i * 4)) & 0x0f;
209 dimm_size = translate_i82810_to_mb[drp];
211 addr = (dimm_start * 1024 * 1024) + addr_offset;
212 #if HAVE_ENOUGH_REGISTERS
213 PRINT_DEBUG(" Sending RAM command 0x");
214 PRINT_DEBUG_HEX8(reg8);
215 PRINT_DEBUG(" to 0x");
216 PRINT_DEBUG_HEX32(addr);
223 dimm_bank = translate_i82810_to_bank[drp];
225 addr = ((dimm_start + dimm_bank) * 1024 * 1024) + addr_offset;
226 #if HAVE_ENOUGH_REGISTERS
227 PRINT_DEBUG(" Sending RAM command 0x");
228 PRINT_DEBUG_HEX8(reg8);
229 PRINT_DEBUG(" to 0x");
230 PRINT_DEBUG_HEX32(addr);
236 dimm_start += dimm_size;
240 /*-----------------------------------------------------------------------------
241 DIMM-independant configuration functions.
242 -----------------------------------------------------------------------------*/
245 * Set DRP - DRAM Row Population Register (Device 0).
247 static void spd_set_dram_size(void)
249 /* The variables drp and dimm_size have to be ints since all the
250 * SMBus-related functions return ints, and its just easier this way.
252 int i, drp, dimm_size;
256 for (i = 0; i < DIMM_SOCKETS; i++) {
257 /* First check if a DIMM is actually present. */
258 if (smbus_read_byte(DIMM_SPD_BASE + i, 2) == 4) {
259 print_debug("Found DIMM in slot ");
263 dimm_size = smbus_read_byte(DIMM_SPD_BASE + i, 31);
265 /* WISHLIST: would be nice to display it as decimal? */
266 print_debug("DIMM is 0x");
267 print_debug_hex8(dimm_size * 4);
270 /* The i810 can't handle DIMMs larger than 128MB per
271 * side. This will fail if the DIMM uses a
272 * non-supported DRAM tech, and can't be used until
273 * buffers are done dynamically.
274 * Note: the factory BIOS just dies if it spots this :D
276 if (dimm_size > 32) {
277 print_err("DIMM row sizes larger than 128MB not"
278 "supported on i810\n");
280 ("Attempting to treat as 128MB DIMM\n");
284 /* This array is provided in raminit.h, because it got
285 * extremely messy. The above way is cleaner, but
286 * doesn't support any asymetrical/odd configurations.
288 dimm_size = translate_spd_to_i82810[dimm_size];
290 print_debug("After translation, dimm_size is 0x");
291 print_debug_hex8(dimm_size);
294 /* If the DIMM is dual-sided, the DRP value is +2 */
295 /* TODO: Figure out asymetrical configurations. */
296 if ((smbus_read_byte(DIMM_SPD_BASE + i, 127) | 0xf) ==
298 print_debug("DIMM is dual-sided\n");
302 print_debug("No DIMM found in slot ");
306 /* If there's no DIMM in the slot, set value to 0. */
310 /* Put in dimm_size to reflect the current DIMM. */
311 drp |= dimm_size << (i * 4);
314 print_debug("DRP calculated to 0x");
315 print_debug_hex8(drp);
318 pci_write_config8(PCI_DEV(0, 0, 0), DRP, drp);
321 static void set_dram_timing(void)
323 /* TODO, for now using default, hopefully safe values. */
324 // pci_write_config8(PCI_DEV(0, 0, 0), DRAMT, 0x00);
328 * TODO: BUFF_SC needs to be set according to the DRAM tech (x8, x16,
329 * or x32), but the datasheet doesn't list all the details. Currently, it
330 * needs to be pulled from the output of 'lspci -xxx Rx92'.
332 * Common results (tested on actual hardware) are:
334 * (DRP: c = 128MB dual sided, d = 128MB single sided, f = 256MB dual sided)
336 * BUFF_SC TOM DRP DIMM0 DIMM1
337 * ----------------------------------------------------------------------------
338 * 0x3356 128MB 0x0c 128MB dual-sided -
339 * 0xcc56 128MB 0xc0 - 128MB dual-sided
340 * 0x77da 128MB 0x0d 128MB single-sided -
341 * 0xddda 128MB 0xd0 - 128MB single-sided
342 * 0x0001 256MB 0xcc 128MB dual-sided 128MB dual-sided
343 * 0x55c6 256MB 0xdd 128MB single-sided 128MB single-sided
344 * 0x4445 256MB 0xcd 128MB single-sided 128MB dual-sided
345 * 0x1145 256MB 0xdc 128MB dual-sided 128MB single-sided
346 * 0x3356 256MB 0x0f 256MB dual-sided -
347 * 0xcc56 256MB 0xf0 - 256MB dual-sided
348 * 0x0001 384MB 0xcf 256MB dual-sided 128MB dual-sided
349 * 0x0001 384MB 0xfc 128MB dual-sided 256MB dual-sided
350 * 0x1145 384MB 0xdf 256MB dual-sided 128MB single-sided
351 * 0x4445 384MB 0xfd 128MB single-sided 256MB dual-sided
352 * 0x0001 512MB 0xff 256MB dual-sided 256MB dual-sided
355 * http://www.coreboot.org/pipermail/coreboot/2009-May/047966.html
357 static void set_dram_buffer_strength(void)
359 struct dimm_info d0, d1;
362 /* Check first slot. */
363 d0.size = d0.ds = d0.ss = 0;
364 if (smbus_read_byte(DIMM_SPD_BASE, SPD_MEMORY_TYPE)
365 == SPD_MEMORY_TYPE_SDRAM) {
366 d0.size = smbus_read_byte(DIMM_SPD_BASE, SPD_BANK_DENSITY);
367 d0.ds = smbus_read_byte(DIMM_SPD_BASE, SPD_NUM_DIMM_BANKS) > 1;
371 /* Check second slot. */
372 d1.size = d1.ds = d1.ss = 0;
373 if (smbus_read_byte(DIMM_SPD_BASE + 1, SPD_MEMORY_TYPE)
374 == SPD_MEMORY_TYPE_SDRAM) {
375 d1.size = smbus_read_byte(DIMM_SPD_BASE + 1, SPD_BANK_DENSITY);
376 d1.ds = smbus_read_byte(DIMM_SPD_BASE + 1,
377 SPD_NUM_DIMM_BANKS) > 1;
383 /* Tame the beast... */
384 if ((d0.ds && d1.ds) || (d0.ds && d1.ss) || (d0.ss && d1.ds))
386 if ((d0.size && !d1.size) || (!d0.size && d1.size) || (d0.ss && d1.ss))
388 if ((d0.ds && !d1.size) || (!d0.size && d1.ds) || (d0.ss && d1.ss)
389 || (d0.ds && d1.ss) || (d0.ss && d1.ds))
391 if ((d0.ss && !d1.size) || (!d0.size && d1.ss))
393 if ((d0.size && !d1.size) || (!d0.size && d1.size))
395 if ((d0.ds && !d1.size) || (!d0.size && d1.ds) || (d0.ds && d1.ss)
398 if ((d0.ss && !d1.size) || (!d0.size && d1.ss) || (d0.ss && d1.ss))
400 if ((!d0.size && d1.ss) || (d0.ds && d1.ss) || (d0.ss && d1.ss))
402 if (d0.size && !d1.size)
404 if ((d0.ss && !d1.size) || (d0.ss && d1.ss) || (d0.ss && d1.ds))
406 if (!d0.size && d1.size)
408 if ((d0.size && !d1.size) || (d0.ss && !d1.size) || (!d0.size && d1.ss)
409 || (d0.ss && d1.ss) || (d0.ds && d1.ss))
411 if (d0.size && !d1.size)
413 if ((!d0.size && d1.size) || (d0.ss && !d1.size) || (d0.ss && d1.ss)
416 if (!d0.size && d1.size)
419 print_debug("BUFF_SC calculated to 0x");
420 print_debug_hex16(buff_sc);
423 pci_write_config16(PCI_DEV(0, 0, 0), BUFF_SC, buff_sc);
426 /*-----------------------------------------------------------------------------
428 -----------------------------------------------------------------------------*/
430 void sdram_set_registers(void)
435 did = pci_read_config16(PCI_DEV(0, 0, 0), PCI_DEVICE_ID);
437 /* Ideally, this should be R/W for as many ranges as possible. */
438 pci_write_config8(PCI_DEV(0, 0, 0), PAMR, 0xff);
440 /* Set size for onboard-VGA framebuffer. */
441 reg8 = pci_read_config8(PCI_DEV(0, 0, 0), SMRAM);
442 reg8 &= 0x3f; /* Disable graphics (for now). */
444 if (CONFIG_VIDEO_MB == 512)
445 reg8 |= (1 << 7); /* Enable graphics (512KB RAM). */
446 else if (CONFIG_VIDEO_MB == 1)
447 reg8 |= (1 << 7) | (1 << 6); /* Enable graphics (1MB RAM). */
449 pci_write_config8(PCI_DEV(0, 0, 0), SMRAM, reg8);
451 /* MISSC2: Bits 1, 2, 6, 7 must be set for VGA (see datasheet). */
452 reg8 = pci_read_config8(PCI_DEV(0, 0, 0), MISSC2);
453 reg8 |= (1 << 1); /* Instruction Parser Unit-Level Clock Gating */
454 reg8 |= (1 << 2); /* Palette Load Select */
456 /* Bits 6 and 7 are only available on 82810E (not 82810). */
457 reg8 |= (1 << 6); /* Text Immediate Blit */
458 reg8 |= (1 << 7); /* Must be 1 as per datasheet. */
460 pci_write_config8(PCI_DEV(0, 0, 0), MISSC2, reg8);
463 void sdram_set_spd_registers(void)
466 set_dram_buffer_strength();
473 void sdram_enable(void)
478 PRINT_DEBUG("RAM Enable 1: Apply NOP\n");
479 do_ram_command(RAM_COMMAND_NOP);
482 /* 2. Precharge all. Wait tRP. */
483 PRINT_DEBUG("RAM Enable 2: Precharge all\n");
484 do_ram_command(RAM_COMMAND_PRECHARGE);
487 /* 3. Perform 8 refresh cycles. Wait tRC each time. */
488 PRINT_DEBUG("RAM Enable 3: CBR\n");
489 for (i = 0; i < 8; i++) {
490 do_ram_command(RAM_COMMAND_CBR);
494 /* 4. Mode register set. Wait two memory cycles. */
495 PRINT_DEBUG("RAM Enable 4: Mode register set\n");
496 do_ram_command(RAM_COMMAND_MRS);
499 /* 5. Normal operation (enables refresh at 15.6usec). */
500 PRINT_DEBUG("RAM Enable 5: Normal operation\n");
501 do_ram_command(RAM_COMMAND_NORMAL);
504 PRINT_DEBUG("Northbridge following SDRAM init:\n");