See attached. Thanks Carl-Daniel for the explanation on floats in CAR, hope
you don't mind that I've quoted you ;)
-Corey
Add ram init support for the Via CN700 to v3. Note that this isn't based on
current v2 support, but rather an older version I was working on that used too
many registers. It will be ported to v2 (eventually).
Signed-off-by: Corey Osgood <[EMAIL PROTECTED]>
Index: Kconfig
===================================================================
--- Kconfig (revision 923)
+++ Kconfig (working copy)
@@ -92,6 +92,8 @@
boolean
config NORTHBRIDGE_INTEL_I440BXEMULATION
boolean
+config NORTHBRIDGE_VIA_CN700
+ boolean
# Southbridges:
config SOUTHBRIDGE_AMD_CS5536
Index: northbridge/via/cn700/initram.c
===================================================================
--- northbridge/via/cn700/initram.c (revision 0)
+++ northbridge/via/cn700/initram.c (revision 0)
@@ -0,0 +1,752 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2008 Corey Osgood <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <types.h>
+#include <lib.h>
+#include <console.h>
+#include <device/pci.h>
+#include <legacy.h>
+#include <io.h>
+#include <device/pci_ids.h>
+#include <config.h>
+#include <spd.h>
+#include "cn700.h"
+
+/* NOTE: We can't use floats in CAR, even though gcc will allow it. "The
+ * problem is that many x86 CPUs have cache bypasses for x87/MMX/SSE/whatever
+ * instructions and that would cause them not to be filled from CAR. At least
+ * that's my understanding from reading a few too many of these databooks."
+ * -Carl-Daniel Hailfinger
+ */
+
+/* TODO: This only supports DDR2 memory, but CN700 also supports DDR */
+
+/* Is this correct? */
+static void read32(u32 addr)
+{
+ u32 val;
+ volatile unsigned long *x;
+ x = (void *)addr;
+ val = *x;
+}
+
+static void do_ram_command(struct board_info *dev, u8 command, u32 addr_offset)
+{
+ u8 reg8;
+ int i, j;
+
+ reg8 = pci_conf1_read_config8(dev->d0f3, DRAM_MISC_CTL);
+ reg8 &= 0xf8; /* Clear bits 2-0. */
+ reg8 |= command;
+ pci_conf1_write_config8(dev->d0f3, DRAM_MISC_CTL, reg8);
+
+ printk(BIOS_SPEW, " Sending RAM command ");
+ switch(command) {
+ case RAM_COMMAND_NORMAL: printk(BIOS_SPEW, "'Normal' to 0x%x",
+ addr_offset);
+ break;
+ case RAM_COMMAND_NOP: printk(BIOS_SPEW, "'No-op' to 0x%x",
+ addr_offset);
+ break;
+ case RAM_COMMAND_PRECHARGE: printk(BIOS_SPEW,
+ "'Precharge' to 0x%x\n", addr_offset);
+ break;
+ case RAM_COMMAND_MRS:
+ printk(BIOS_SPEW, "'MRS' to 0x%x", addr_offset);
+ if(addr_offset == 0x12000)
+ {
+ read32(0x800);
+ } else {
+ read32(0x121c20);
+ read32(0x120020);
+ }
+ break;
+ case RAM_COMMAND_CBR:
+ for(j = 0; j < 8; j++) {
+ read32((reg8 << 26));
+ udelay(100);
+ }
+ printk(BIOS_SPEW, "'CBR' to 0x%x", addr_offset);
+ break;
+ };
+
+ /* NOTE: Dual-sided and multi-dimm ready */
+ read32(0 + addr_offset);
+ for(i = 0; i < (ARRAY_SIZE(dev->spd_channel0) * 2); i++) {
+ reg8 = pci_conf1_read_config8(dev->d0f3, RANK0_START + i);
+ if(reg8) {
+ read32((reg8 << 26) + addr_offset);
+ printk(BIOS_SPEW, ", 0x%x", (reg8 << 26) + addr_offset);
+ if(command == RAM_COMMAND_MRS)
+ {
+ if(addr_offset == 0x12000)
+ {
+ read32((reg8 << 26) + 0x800);
+ } else {
+ read32((reg8 << 26) + 0x121c20);
+ read32((reg8 << 26) + 0x120020);
+ }
+ } else if(command == RAM_COMMAND_CBR)
+ {
+ for(j = 0; j < 8; j++) {
+ read32((reg8 << 26));
+ udelay(100);
+ }
+ }
+ }
+ }
+ printk(BIOS_SPEW, "\n");
+}
+
+/**
+ * Configure the bus between the cpu and the northbridge. This might be able
to
+ * be moved to post-ram code in the future. For the most part, these registers
+ * should not be messed around with. These are too complex to explain short of
+ * copying the datasheets into the comments, but most of these values are from
+ * the BIOS Porting Guide, so they should work on any board. If they don't,
+ * try the values from your factory BIOS.
+ *
+ * TODO: Changing the DRAM frequency doesn't work (hard lockup)
+ *
+ * @param dev The northbridge's CPU Host Interface (D0F2)
+ */
+void c7_cpu_setup(u32 dev)
+{
+ /* Host bus interface registers (D0F2 0x50-0x67) */
+ /* Request phase control */
+ pci_conf1_write_config8(dev, 0x50, 0x88);
+ /* CPU Interface Control */
+ pci_conf1_write_config8(dev, 0x51, 0x7a);
+ pci_conf1_write_config8(dev, 0x52, 0x6f);
+ /* Arbitration */
+ pci_conf1_write_config8(dev, 0x53, 0x88);
+ /* Miscellaneous Control */
+ pci_conf1_write_config8(dev, 0x54, 0x1e);
+ pci_conf1_write_config8(dev, 0x55, 0x16);
+ /* Write Policy */
+ pci_conf1_write_config8(dev, 0x56, 0x01);
+ /* Miscellaneous Control */
+ /* DRAM Operating Frequency (bits 7:5)
+ * 000 : 100MHz 001 : 133MHz
+ * 010 : 166MHz 011 : 200MHz
+ * 100 : 266MHz 101 : 333MHz
+ * 110/111 : Reserved
+ */
+ /* CPU Miscellaneous Control */
+ pci_conf1_write_config8(dev, 0x59, 0x44);
+ /* Write Policy */
+ pci_conf1_write_config8(dev, 0x5d, 0xb2);
+ /* Bandwidth Timer */
+ pci_conf1_write_config8(dev, 0x5e, 0x88);
+ /* CPU Miscellaneous Control */
+ pci_conf1_write_config8(dev, 0x5f, 0xc7);
+
+ /* Line DRDY# Timing Control */
+ pci_conf1_write_config8(dev, 0x60, 0xff);
+ pci_conf1_write_config8(dev, 0x61, 0xff);
+ pci_conf1_write_config8(dev, 0x62, 0x0f);
+ /* QW DRDY# Timing Control */
+ pci_conf1_write_config8(dev, 0x63, 0xff);
+ pci_conf1_write_config8(dev, 0x64, 0xff);
+ pci_conf1_write_config8(dev, 0x65, 0x0f);
+ /* Read Line Burst DRDY# Timing Control */
+ pci_conf1_write_config8(dev, 0x66, 0xff);
+ pci_conf1_write_config8(dev, 0x67, 0x30);
+
+ /* Host Bus I/O Circuit (see datasheet) */
+ /* Host Address Pullup/down Driving */
+ pci_conf1_write_config8(dev, 0x70, 0x11);
+ pci_conf1_write_config8(dev, 0x71, 0x11);
+ pci_conf1_write_config8(dev, 0x72, 0x11);
+ pci_conf1_write_config8(dev, 0x73, 0x11);
+ /* Miscellaneous Control */
+ pci_conf1_write_config8(dev, 0x74, 0x35);
+ /* AGTL+ I/O Circuit */
+ pci_conf1_write_config8(dev, 0x75, 0x28);
+ /* AGTL+ Compensation Status */
+ pci_conf1_write_config8(dev, 0x76, 0x74);
+ /* AGTL+ Auto Compensation Offest */
+ pci_conf1_write_config8(dev, 0x77, 0x00);
+ /* Host FSB CKG Control */
+ pci_conf1_write_config8(dev, 0x78, 0x0a);
+ /* Address/Address Clock Output Delay Control */
+ pci_conf1_write_config8(dev, 0x79, 0xaa);
+ /* Address Strobe Input Delay Control */
+ pci_conf1_write_config8(dev, 0x7a, 0x24);
+ /* Address CKG Rising/Falling Time Control */
+ pci_conf1_write_config8(dev, 0x7b, 0xaa);
+ /* Address CKG Clock Rising/Falling Time Control */
+ pci_conf1_write_config8(dev, 0x7c, 0x00);
+ /* Undefined (can't remember why I did this) */
+ pci_conf1_write_config8(dev, 0x7d, 0x6d);
+
+ pci_conf1_write_config8(dev, 0x7e, 0x00);
+ pci_conf1_write_config8(dev, 0x7f, 0x00);
+ pci_conf1_write_config8(dev, 0x80, 0x1b);
+ pci_conf1_write_config8(dev, 0x81, 0x0a);
+ pci_conf1_write_config8(dev, 0x82, 0x0a);
+ pci_conf1_write_config8(dev, 0x83, 0x0a);
+}
+
+/**
+ * Set up various ram and other control registers statically. Some of these
may
+ * not be needed, other should be done with spd info, but that's a project for
+ * the future
+ */
+void sdram_set_registers(struct board_info *dev)
+{
+ /* DQ/DQS Strength Control */
+ pci_conf1_write_config8(dev->d0f3, 0xd0, 0x88);
+ pci_conf1_write_config8(dev->d0f3, 0xd1, 0x8b);
+ pci_conf1_write_config8(dev->d0f3, 0xd2, 0x89);
+ /* SMM and APIC Decoding */
+ //pci_conf1_write_config8(dev->d0f3, 0x86, 0x2d);
+ pci_conf1_write_config8(dev->d0f3, 0x86, (1 << 4));
+ pci_conf1_write_config8(dev->d0f7, 0xe6, (1 << 4));
+
+ /* Driving selection */
+ /* DQ / DQS ODT Driving and Range Select */
+ pci_conf1_write_config8(dev->d0f3, 0xd5, 0x8a);
+ /* Memory Pads Driving and Range Select */
+ pci_conf1_write_config8(dev->d0f3, 0xd6, 0xaa);
+ /* DRAM Driving â Group DQS */
+ pci_conf1_write_config8(dev->d0f3, 0xe0, 0xee);
+ /* DRAM Driving â Group DQ (DQ, MPD, DQM) */
+ pci_conf1_write_config8(dev->d0f3, 0xe2, 0xac);//ba
+ /* DRAM Driving â Group CS */
+ pci_conf1_write_config8(dev->d0f3, 0xe4, 0x66);
+ /* DRAM Driving â Group MA */
+ pci_conf1_write_config8(dev->d0f3, 0xe8, 0x86);
+ /* DRAM Driving â Group MCLK */
+ pci_conf1_write_config8(dev->d0f3, 0xe6, 0xaa);
+
+ /* ODT (some are set with driving select above) */
+ /* Memory Pad ODT Pullup / Pulldown Control */
+ pci_conf1_write_config8(dev->d0f3, 0xd4, 0x0a);
+ /* Memory Ranks ODT Lookup Table */
+ pci_conf1_write_config8(dev->d0f3, 0xd8, 0x00);//was 1
+ /* Compensation Control */
+ pci_conf1_write_config8(dev->d0f3, 0xd3, 0x89);//enable auto
compensation
+
+ /* MCLKO Phase Control */
+ pci_conf1_write_config8(dev->d0f3, 0x91, 0x02);
+ /* CS/CKE Clock Phase Control */
+ pci_conf1_write_config8(dev->d0f3, 0x92, 0x06);
+ /* SCMD/MA Clock Phase Control */
+ pci_conf1_write_config8(dev->d0f3, 0x93, 0x07);
+ /* Channel A DQS Input Capture Range Control */
+ pci_conf1_write_config8(dev->d0f3, 0x78, 0x83);
+ /* DQS Input Capture Range Control */
+ /* Set in accordance with the BIOS update note */
+ pci_conf1_write_config8(dev->d0f3, 0x7a, 0x00);
+ /* DQS Input Delay Offset Control */
+ pci_conf1_write_config8(dev->d0f3, 0x7c, 0x00);
+ /* SDRAM ODT Control */
+ pci_conf1_write_config8(dev->d0f3, 0xda, 0x80);
+ /* DQ/DQS CKG Output Delay Control - I */
+ pci_conf1_write_config8(dev->d0f3, 0xdc, 0xff);
+ /* DQ/DQS CKG Output Delay Control - II */
+ pci_conf1_write_config8(dev->d0f3, 0xdd, 0xff);
+ /* DQS / DQ CKG Duty Cycle Control */
+ pci_conf1_write_config8(dev->d0f3, 0xec, 0x88);
+ /* MCLK Output Duty Control */
+ pci_conf1_write_config8(dev->d0f3, 0xee, 0x00);
+ pci_conf1_write_config8(dev->d0f3, 0xed, 0x10);
+ /* DQS CKG Input Delay Control */
+ pci_conf1_write_config8(dev->d0f3, 0xef, 0x10);
+
+ pci_conf1_write_config8(dev->d0f3, 0x77, 0x9d);
+ pci_conf1_write_config8(dev->d0f3, 0x79, 0x83);
+ pci_conf1_write_config16(dev->d0f3, 0x88, 0x0020);
+
+ //pci_conf1_write_config8(dev->d0f4, 0xa7, 0x80);
+
+ /* VLink Control */
+ pci_conf1_write_config8(dev->d0f7, 0xb0, 0x05);
+ pci_conf1_write_config8(dev->d0f7, 0xb1, 0x01);
+
+ /* Memory base */
+ pci_conf1_write_config16(dev->d1f0, 0x20, 0xfb00);
+ /* Memory limit */
+ pci_conf1_write_config16(dev->d1f0, 0x22, 0xfcf0);
+ /* Prefetch memory base */
+ pci_conf1_write_config16(dev->d1f0, 0x24, 0xf400);
+ /* Prefetch memory limit */
+ pci_conf1_write_config16(dev->d1f0, 0x26, 0xf7f0);
+ /* PCI to PCI bridge control */
+ pci_conf1_write_config16(dev->d1f0, 0x3e, 0x0008);
+
+ /* CPU to PCI flow control 1 */
+ pci_conf1_write_config8(dev->d1f0, 0x40, 0x83);
+ pci_conf1_write_config8(dev->d1f0, 0x41, 0xc3);//clear reset error, set
to 43
+ pci_conf1_write_config8(dev->d1f0, 0x42, 0xe2);
+ pci_conf1_write_config8(dev->d1f0, 0x43, 0x44);
+ pci_conf1_write_config8(dev->d1f0, 0x44, 0x34);
+ pci_conf1_write_config8(dev->d1f0, 0x45, 0x72);
+
+ /* Disable cross bank/multi page mode */
+ pci_conf1_write_config8(dev->d0f3, DDR_PAGE_CTL, 0x80);
+ pci_conf1_write_config8(dev->d0f3, DRAM_REFRESH_COUNTER, 0x00);
+
+ /* Set WR=5 and RFC */
+ //pci_conf1_write_config8(dev->d0f3, 0x61, 0x94);//c7
+ /* Set CAS=5 */
+ //pci_conf1_write_config8(dev->d0f3, 0x62, 0x7a);//af
+ //pci_conf1_write_config8(dev->d0f3, 0x63, 0x00);//ca
+ //pci_conf1_write_config8(dev->d0f3, 0x64, 0x88);
+ /* Set to DDR2 sdram, BL=8 (0xc8, 0xc0 for bl=4) */
+ pci_conf1_write_config8(dev->d0f3, 0x6c, 0xc8);//c8
+ /* Allow manual dll reset */
+ pci_conf1_write_config8(dev->d0f3, 0x6b, 0x10);
+
+ pci_conf1_write_config8(dev->d0f3, 0x6e, 0x89);
+ pci_conf1_write_config8(dev->d0f3, 0x67, 0x50);
+ pci_conf1_write_config8(dev->d0f3, 0x65, 0xd9);
+
+ /* Zero the MA map field */
+ pci_conf1_write_config16(dev->d0f3, 0x50, 0x0);
+
+ /* BA0-2 Selection. Don't mess with */
+ pci_conf1_write_config8(dev->d0f3, 0x52, 0x33);
+ pci_conf1_write_config8(dev->d0f3, 0x53, 0x3f);
+
+ /* Disable bank interleaving. */
+ pci_conf1_write_config32(dev->d0f3, 0x58, 0x00000000);
+ pci_conf1_write_config8(dev->d0f3, 0x88, 0x08);
+
+ /* Some DQS control stuffs */
+ pci_conf1_write_config8(dev->d0f3, 0x74, 0x04);
+ pci_conf1_write_config8(dev->d0f3, 0x75, 0x04);
+ pci_conf1_write_config8(dev->d0f3, 0x76, 0x00);
+
+ /* Thanks to Urbez Santana Roma for this */
+ pci_conf1_write_config8(dev->d1f0, 0x19, 0x1);
+ pci_conf1_write_config8(dev->d1f0, 0x1a, 0x1);
+}
+
+
+
+/**
+ * Check the detected timing against timings supported by the CN700, and
+ * adjust as necessary.
+ *
+ * @param val The value to be checked.
+ * @param min Minimum value supported by the CN700.
+ * @param max Maximum value supported by the CN700.
+ * @return ret The checked and/or modified value.
+ */
+static u16 check_timing(u16 val, u16 min, u16 max)
+{
+ int ret;
+ if(val < min)
+ ret = min;
+ else if(val > max)
+ ret = max;
+ else
+ ret = val;
+ return ret;
+}
+
+/**
+ * Set the DRAM size registers
+ *
+ * @param dev: struct containing spd addresses and pci device locations
+ * @param i: Which DRAM Rank to be sizing
+ */
+static int do_ram_size(struct board_info *dev, int i)
+{
+ u8 spd_data, j, reg8 = 0;
+
+ /* DRAM Bank Size */
+ spd_data = spd_read_byte(dev->spd_channel0[i],
+ SPD_DENSITY_OF_EACH_ROW_ON_MODULE);
+
+ /* The nibbles of the bytes are flipped between
+ * SPD data and what Via requires */
+ if(!spd_data || spd_data == 0xff) {
+ printk(BIOS_DEBUG, "No memory in slot %d\n", i);
+ return 0;
+ }
+ else if(spd_data >= 0x10)
+ spd_data = spd_data >> 4;
+ else
+ spd_data = spd_data << 4;
+
+ printk(BIOS_DEBUG, "Found %dMB module in slot %d\n", (int)(spd_data <<
6), i);
+
+ /* Set up the DRAM registers */
+ if(i)
+ {
+ printk(BIOS_DEBUG, "Searching for the top of the previous
module\n");
+ /* 0x40-0x47 are top addresses, 0x49-0x4f are base addressses */
+ for(j = 1; !reg8 && j < (i * 2); j++) {
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x49 + (i * 2)
- j);
+ printk(BIOS_DEBUG, ".");
+ }
+ printk(BIOS_DEBUG, "\nDone, previous module size is %dMB\n",
(int)reg8);
+ }
+
+ pci_conf1_write_config8(dev->d0f3, RANK0_START + (i * 2), reg8);
+ pci_conf1_write_config8(dev->d0f3, RANK0_END + (i * 2), spd_data +
reg8);
+
+ /* Set TOUD. It's easier to keep bumping
+ * this up then to figure it out later */
+ printk(BIOS_DEBUG, "Setting Top of Usable DRAM to %dMB\n",
+ (int)((spd_data + reg8) << 6));
+
+ pci_conf1_write_config8(dev->d0f3, 0x85, (spd_data + reg8) << 2);
+ pci_conf1_write_config8(dev->d0f7, 0xe5, (spd_data + reg8) << 2);
+
+ /* Just a mockup, needs a detection routine */
+ /* if(dual sided) {
+ pci_conf1_write_config8(dev->d0f3, 0x49 + (i * 2) + 1,
+ spd_data + reg8);
+ pci_conf1_write_config8(dev->d0f3, 0x40 + (i * 2) + 1,
+ (spd_data * 2) + reg8);
+ } */
+
+ /* Enable the rank, and map it to the virtual rank of the same number.
*/
+ reg8 = 0x80;
+ reg8 |= ((i * 2) << 4);
+ /* if(dual sided) reg8 |= (1 << 4) | ((i * 2) + 1); */
+ pci_conf1_write_config8(dev->d0f3, 0x54 + i, reg8);
+
+ return 1;
+}
+
+static void do_twr_trfc(struct board_info *dev, int i, int ram_cycle)
+{
+ /* Transform spd byte 40's tRFC value into a decimal */
+ static const int byte_40_tRFC[6] = {0, 25, 33, 50, 66, 75 };
+
+ u8 reg8, j;
+ u16 spd_data;
+
+ printk(BIOS_SPEW, "Calculating tWR and tRFC\n");
+ /* tWR (bits 7:6) */
+ /* JEDEC spec allows for decimal values, but coreboot doesn't.
+ * Convert the decimal value to an int (done more below). */
+ reg8 = spd_read_byte(dev->spd_channel0[i], SPD_tWR);
+ spd_data = (((reg8 & ~0x3) >> 2) * 100);
+ spd_data |= ((reg8 & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 5);
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x61);
+ if((spd_data - 2) > (reg8 >> 6)) {
+ reg8 &= ~(0x3 << 6);
+ reg8 |= ((spd_data - 2) << 6);
+ }
+
+ /* tRFC */
+ spd_data = (spd_read_byte(dev->spd_channel0[i], SPD_tRFC) * 100);
+ j = spd_read_byte(dev->spd_channel0[i], 40);
+ if(j & 1)
+ spd_data += (256 * 100);
+ j = (j >> 1) & 0x7;
+ spd_data |= byte_40_tRFC[j];
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 8, 71);
+ if((spd_data - 8) > (reg8 & 0x3f)) {
+ reg8 &= ~0x3f;
+ reg8 |= (spd_data - 8);
+ }
+ pci_conf1_write_config8(dev->d0f3, 0x61, reg8);
+}
+
+static void do_tras_cas(struct board_info *dev, int i, int ram_cycle)
+{
+ u8 reg8;
+ int spd_data, j;
+
+ printk(BIOS_SPEW, "Calculating tRAS and CAS\n");
+
+ /* tRAS */
+ spd_data = spd_read_byte(dev->spd_channel0[i], 30);
+ spd_data = (spd_data / ram_cycle);
+ spd_data = check_timing(spd_data, 5, 20);
+
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x62);
+ if((spd_data - 10) > (reg8 >> 4)) {
+ reg8 &= 0x0f;
+ reg8 |= ((spd_data -10) << 4);
+ }
+
+ /* CAS Latency */
+ spd_data = spd_read_byte(dev->spd_channel0[i],
+ SPD_ACCEPTABLE_CAS_LATENCIES);
+
+ j = 2;
+ while(!((spd_data >> j) & 1)) {
+ j++;
+ }
+ /* j should now be the CAS latency,
+ * in T for the module's rated speed */
+ j = check_timing(j, 2, 5);
+ if((j - 2) > (reg8 & 0x7)) {
+ reg8 &= ~0x7;
+ reg8 |= j;
+ }
+ pci_conf1_write_config8(dev->d0f3, 0x62, reg8);
+}
+
+static void do_trrd_trtp_twtr(struct board_info *dev, int i, int ram_cycle)
+{
+ u8 reg8, j;
+ u16 spd_data;
+
+ printk(BIOS_SPEW, "Calculating tRRD, tRTP, and tWTR\n");
+ /* tRRD */
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x63);
+ j = spd_read_byte(dev->spd_channel0[i], SPD_tRRD);
+ spd_data = ((j >> 2) * 100);
+ spd_data |= ((j & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 5);
+ if((spd_data - 2) > (reg8 >> 6)) {
+ reg8 &= 0x3f;
+ reg8 |= (spd_data - 2) << 6;
+ }
+
+ /* tRTP */
+ j = spd_read_byte(dev->spd_channel0[i], SPD_tRTP);
+ spd_data = ((j >> 2) * 100);
+ spd_data |= ((j & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 3);
+ if(spd_data - 2) {
+ reg8 |= 0x8;
+ }
+
+ /* tWTR */
+ j = spd_read_byte(dev->spd_channel0[i], SPD_tWTR);
+ spd_data = ((j >> 2) * 100);
+ spd_data |= ((j & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 3);
+ if(spd_data - 2) {
+ reg8 |= 0x2;
+ }
+ pci_conf1_write_config8(dev->d0f3, 0x63, reg8);
+}
+
+
+static void do_trcd_trp(struct board_info *dev, int i, int ram_cycle)
+{
+ u8 reg8, j;
+ u16 spd_data;
+
+ printk(BIOS_SPEW, "Calculating tRCD and tRP\n");
+
+ /* tRCD */
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x64);
+ j = spd_read_byte(dev->spd_channel0[i], SPD_tRCD);
+ spd_data = ((j >> 2) * 100);
+ spd_data |= ((j & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 5);
+ if((spd_data - 2) > (reg8 >> 6)) {
+ reg8 &= 0x3f;
+ reg8 |= (spd_data - 2) << 6;
+ }
+
+ /* CKE Minimum Pulse */
+ reg8 |= 1 << 4; /* 0 = 2T, 1 = 3T */
+
+ /* tRP (datasheet calls this tPR) */
+ j = spd_read_byte(dev->spd_channel0[i], SPD_tRP);
+ spd_data = ((j >> 2) * 100);
+ spd_data |= ((j & 0x3) * 25);
+ spd_data = spd_data / (ram_cycle * 100);
+ spd_data = check_timing(spd_data, 2, 5);
+ if((spd_data - 2) > ((reg8 >> 2) & 0x3)) {
+ reg8 &= ~(0x3 << 2);
+ reg8 |= (spd_data - 2) << 2;
+ }
+
+ /* Exit powerdown/active powerdown to any command delay */
+ reg8 |= 0x1; /* 0 = 2T, 1 = 3T */
+ pci_conf1_write_config8(dev->d0f3, 0x64, reg8);
+}
+
+static void do_ma_map(struct board_info *dev, int i)
+{
+ /* The MA Map bits need to be shifted all around */
+ static const int ma_map_shift[4] = {4, 0, 12, 8};
+ u8 reg8, spd_data;
+
+ printk(BIOS_SPEW, "calculating MA map\n");
+ /* Last but not least, MA Map Type */
+ spd_data = spd_read_byte(dev->spd_channel0[i], SPD_NUM_DIMM_BANKS);
+ spd_data &= 0x7;
+ spd_data = check_timing(spd_data, 2, 3);
+ if(spd_data - 2)
+ reg8 = 4;
+ else
+ reg8 = 0;
+ spd_data = spd_read_byte(dev->spd_channel0[i], SPD_NUM_COLUMNS);
+ reg8 += (spd_data - 9);
+
+ spd_data = pci_conf1_read_config16(dev->d0f3, 0x50);
+ spd_data &= ~(0xf << ma_map_shift[i]);
+ spd_data |= (reg8 << (ma_map_shift[i] + 1));
+
+ pci_conf1_write_config16(dev->d0f3, 0x50, spd_data);
+ printk(BIOS_SPEW, "Setting Memory Address Map type to 0x%x\n", reg8);
+}
+
+/**
+ * Set up dram size according to spd data. Eventually, DRAM timings should be
+ * done in a similar manner.
+ *
+ * NOTE: Via datasheets contradict themselves. Some places specify 8 ranks (4
banks),
+ * other places (on the same page) say 4 ranks. This code should be able to
handle
+ * either situation.
+ *
+ * TODO: Double sided dimm support, the old code was broken. This is why
odd-numbered
+ * ranks are ignored.
+ *
+ * @param dev The northbridge devices and spd addresses.
+ */
+void sdram_set_spd_registers(struct board_info *dev)
+{
+ int i, ram_cycle;
+ //int spd_data;
+ u8 reg8;
+
+ /* Table to transform the ram speed register value into a MHz value */
+ /* TODO: multiply table by 10 to get 7.5ns timing accurately
+ * without using floating points */
+ static const int ram_speeds[6] = {10, 8 /*7.5*/, 6, 5, 3};
+
+ /* f(MHz) = 1 / (T(ns) * 1000) */
+
+ /* ram_cycle is the cycle time of the ram, in ns */
+ reg8 = (pci_conf1_read_config8(dev->d0f2, 0x57) >> 5);
+ ram_cycle = ram_speeds[reg8];
+
+ for(i = 0; i < ARRAY_SIZE(dev->spd_channel0); i++)
+ {
+ printk(BIOS_SPEW, "Configuring DRAM Bank %d\n", i);
+
+ /* If there's no ram, just continue to the next bank */
+ if(do_ram_size(dev, i))
+ {
+ do_twr_trfc(dev, i, ram_cycle);
+ do_tras_cas(dev, i, ram_cycle);
+ do_trrd_trtp_twtr(dev, i, ram_cycle);
+ do_trcd_trp(dev, i, ram_cycle);
+ do_ma_map(dev, i);
+ } /* if() */
+ } /* for() loop */
+}
+
+/**
+ * Use the DRAM timing values previously plugged into the CN700 registers to
+ * calculate an MRS value that matches Via's values, defined in the CN700 Bios
+ * Porting Guide. Somehow these conform to JEDEC spec, but I'm not sure how.
+ *
+ * CAS BL WR=2 WR=3 WR=4 WR=5
+ * 2 4 001150 100150 101150 002150
+ * 2 8 001158 100158 101158 002158
+ * 3 4 0011d0 1001d0 1011d0 0021d0
+ * 3 8 0011d8 1001d8 1011d8 0021d8
+ * 4 4 001250 100250 101250 002250
+ * 4 8 001258 100258 101258 002258
+ * 5 4 0012d0 1002d0 1012d0 0022d0
+ * 5 8 0012d8 1002d8 1012d8 0022d8
+**/
+static u32 find_ddr2_mrs_value(struct board_info *dev)
+{
+ static const int CASLength[4] = {0x150, 0x1d0, 0x250, 0x2d0};
+ static const int WR[4] = {0x1000, 0x100000, 0x101000, 0x2000};
+
+ u8 reg8;
+ u32 mrs = 0x0;
+
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x6c);
+ reg8 &= 8;
+ mrs |= reg8;
+
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x62) & 0x3;
+ mrs |= CASLength[reg8];
+
+ reg8 = pci_conf1_read_config8(dev->d0f3, 0x61) >> 6;
+ mrs |= WR[reg8];
+
+ printk(BIOS_SPEW, "Mode Register Set (MRS) value is 0x%x\n", mrs);
+
+ return mrs;
+}
+
+void ddr2_sdram_enable(struct board_info *dev)
+{
+ u32 reg32;
+
+ /* 1. Apply NOP. */
+ printk(BIOS_SPEW, "RAM Enable 1: Apply NOP\n");
+ do_ram_command(dev, RAM_COMMAND_NOP, 0);
+ udelay(200);
+
+ /* 2. Precharge all. */
+ printk(BIOS_SPEW, "RAM Enable 2: Precharge all\n");
+ do_ram_command(dev, RAM_COMMAND_PRECHARGE, 0);
+
+ /* 3. Mode register set. */
+ printk(BIOS_SPEW, "RAM Enable 3: Mode register set\n");
+ /* Note: 1 in bit 20 of all MRS commands is thanks to Urbez Santana Roma
+ * and is necessary for his Kingston ram */
+ do_ram_command(dev, RAM_COMMAND_MRS, 0x12000);//enable dll
+ do_ram_command(dev, RAM_COMMAND_MRS, 0x800);//reset dll
+
+ /* 4. Precharge all again. */
+ printk(BIOS_SPEW, "RAM Enable 4: Precharge all\n");
+ do_ram_command(dev, RAM_COMMAND_PRECHARGE, 0);
+
+ /* 5. Perform 8 refresh cycles. Wait tRC each time. */
+ printk(BIOS_SPEW, "RAM Enable 5: CBR\n");
+ do_ram_command(dev, RAM_COMMAND_CBR, 0);
+
+ /* 6. Mode register set. */
+ printk(BIOS_SPEW, "RAM Enable 6: Mode register set\n");
+ reg32 = find_ddr2_mrs_value(dev);
+ do_ram_command(dev, RAM_COMMAND_MRS, reg32);
+
+ /* 8. Normal operation */
+ printk(BIOS_SPEW, "RAM Enable 7: Normal operation\n");
+ do_ram_command(dev, RAM_COMMAND_NORMAL, 0);
+ do_ram_command(dev, RAM_COMMAND_NORMAL, 0x30);
+
+ /* Enable refresh.
+ * TODO: Needs to be dynamic,
+ * doesn't matter until ram speed change works */
+ pci_conf1_write_config8(dev->d0f3, DRAM_REFRESH_COUNTER, 0x32);
+
+ /* DQS Tuning: testing on a couple different boards has shown this is
+ * static, or close enough that it can be. Which is good, because the
+ * tuning function used too many registers. */
+ pci_conf1_write_config8(dev->d0f3, CH_A_DQS_OUTPUT_DELAY, 0x00);
+ pci_conf1_write_config8(dev->d0f3, CH_A_MD_OUTPUT_DELAY, 0x03);
+
+ /* Enable VGA device with no memory, add memory later. We need this
+ * here to enable the actual device, otherwise it won't show up until
+ * later and CB will have a fit. */
+ pci_conf1_write_config16(dev->d0f3, 0xa0, (1 << 15));
+ pci_conf1_write_config16(dev->d0f3, 0xa4, 0x0010);
+}
Index: northbridge/via/cn700/Makefile
===================================================================
--- northbridge/via/cn700/Makefile (revision 0)
+++ northbridge/via/cn700/Makefile (revision 0)
@@ -0,0 +1,25 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2008 Corey Osgood <[EMAIL PROTECTED]>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+ifeq ($(CONFIG_NORTHBRIDGE_VIA_CN700),y)
+
+STAGE2_CHIPSET_SRC +=
+
+endif
Index: northbridge/via/cn700/cn700.h
===================================================================
--- northbridge/via/cn700/cn700.h (revision 0)
+++ northbridge/via/cn700/cn700.h (revision 0)
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008 Corey Osgood <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <types.h>
+
+struct board_info {
+ u32 d0f2, d0f3, d0f4, d0f7, d1f0;
+ u16 spd_channel0[2];
+};
+
+void c7_cpu_setup(u32);
+void sdram_set_registers(struct board_info *);
+void sdram_set_spd_registers(struct board_info *);
+void ddr2_sdram_enable(struct board_info *);
+
+/* VGA stuff */
+#define SR_INDEX 0x3c4
+#define SR_DATA 0x3c5
+#define CRTM_INDEX 0x3b4
+#define CRTM_DATA 0x3b5
+#define CRTC_INDEX 0x3d4
+#define CRTC_DATA 0x3d5
+
+/* Memory Controller Registers */
+#define RANK0_END 0x40
+#define RANK1_END 0x41
+#define RANK2_END 0x42
+#define RANK3_END 0x43
+#define RANK0_START 0x48
+#define RANK1_START 0x49
+#define RANK2_START 0x4a
+#define RANK3_START 0x4b
+#define DDR_PAGE_CTL 0x69
+#define DRAM_REFRESH_COUNTER 0x6a
+#define DRAM_MISC_CTL 0x6b
+#define CH_A_DQS_OUTPUT_DELAY 0x70
+#define CH_A_MD_OUTPUT_DELAY 0x71
+
+/* RAM Init Commands */
+#define RAM_COMMAND_NORMAL 0x0
+#define RAM_COMMAND_NOP 0x1
+#define RAM_COMMAND_PRECHARGE 0x2
+#define RAM_COMMAND_MRS 0x3
+#define RAM_COMMAND_CBR 0x4
--
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