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Add support for the Via CN700 with a C7 CPU and DDR2 RAM. Only a single DIMM is 

working for now, and more work is needed for it to be fully dynamic. However,
just about any 128MB-512MB DIMM should work.

Signed-off-by: Corey Osgood <corey.osgood@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3113 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Corey Osgood 2008-02-21 00:56:14 +00:00 committed by Stefan Reinauer
parent f327d9f954
commit bd3f93e330
12 changed files with 1914 additions and 0 deletions
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8
src/include/device/pci_ids.h
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@ -1153,6 +1153,14 @@
#define PCI_DEVICE_ID_VIA_K8T890CE_BR 0xb188
#define PCI_DEVICE_ID_VIA_VT6420_SATA 0x3149
#define PCI_DEVICE_ID_VIA_VT8237R_LPC 0x3227
#define PCI_DEVICE_ID_VIA_CN700_AGP 0x0314
#define PCI_DEVICE_ID_VIA_CN700_ERR 0x1314
#define PCI_DEVICE_ID_VIA_CN700_HOST 0x2314
#define PCI_DEVICE_ID_VIA_CN700_MEMCTRL 0x3208
#define PCI_DEVICE_ID_VIA_CN700_PM 0x4314
#define PCI_DEVICE_ID_VIA_CN700_VLINK 0x7314
#define PCI_DEVICE_ID_VIA_CN700_BRIDGE 0xB198
#define PCI_DEVICE_ID_VIA_CN700_VGA 0x3344
#define PCI_VENDOR_ID_SIEMENS 0x110A
#define PCI_DEVICE_ID_SIEMENS_DSCC4 0x2102

25
src/northbridge/via/cn700/Config.lb Normal file
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##
## This file is part of the coreboot project.
##
## Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
##
## 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
##
config chip.h
object vgabios.o
object northbridge.o
driver agp.o
driver vga.o

165
src/northbridge/via/cn700/agp.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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 <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include "chip.h"
#include "northbridge.h"
#include "cn700.h"
/* This is the main AGP device, and only one used when configured for AGP 2.0 */
static void agp_init(device_t dev)
{
u32 reg32;
/* Some of this may not be necessary,
* it should be handled by the OS */
printk_debug("Enabling AGP.\n");
/* Allow R/W access to AGP registers */
pci_write_config8(dev, 0x4d, 0x15);
/* Setup PCI latency timer */
pci_write_config8(dev, 0xd, 0x8);
/* Set to AGP 3.0 Mode, which should theoretically render the rest of
* the registers set here pointless */
pci_write_config8(dev, 0x84, 0xb);
/* AGP Request Queue Size */
pci_write_config8(dev, 0x4a, 0x1f);
/* AGP Hardware Support (default 0xc4)
* 7: AGP SBA Enable (1 to Enable)
* 6: AGP Enable
* 5: Reserved
* 4: Fast Write Enable
* 3: AGP8X Mode Enable
* 2: AGP4X Mode Enable
* 1: AGP2X Mode Enable
* 0: AGP1X Mode Enable */
pci_write_config8(dev, 0x4b, 0xc4);
/* Enable AGP Backdoor */
pci_write_config8(dev, 0xb5, 0x03);
/* Set aperture to 32MB */
/* TODO: Use config option, explain how it works */
pci_write_config32(dev, 0x94, 0x00010f38);
/* Set GART Table Base Address (31:12) */
pci_write_config32(dev, 0x98, (0x1558 << 12));
/* Set AGP Aperture Base */
pci_write_config32(dev, 0x10, 0xf8000008);
/* Enable CPU/PMSTR GART Access */
reg32 = pci_read_config8(dev, 0xbf);
reg32 |= 0x80;
pci_write_config8(dev, 0xbf, reg32);
/* Enable AGP Aperture. */
reg32 = pci_read_config32(dev, 0x94);
reg32 |= (3 << 7);
pci_write_config32(dev, 0x90, reg32);
/* AGP Control */
pci_write_config8(dev, 0xbc, 0x21);
pci_write_config8(dev, 0xbd, 0xd2);
/* AGP Pad, driving strength, and delay control */
/* All this should be constant, seeing as the
* VGA controller is onboard */
pci_write_config8(dev, 0x40, 0xc7);
pci_write_config8(dev, 0x41, 0xdb);
pci_write_config8(dev, 0x42, 0x10);
pci_write_config8(dev, 0x43, 0xdb);
pci_write_config8(dev, 0x44, 0x24);
/* AGPC CKG Control */
pci_write_config8(dev, 0xc0, 0x02);
pci_write_config8(dev, 0xc1, 0x02);
}
static const struct device_operations agp_operations = {
.read_resources = cn700_noop,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = agp_init,
.ops_pci = 0,
};
static const struct pci_driver agp_driver __pci_driver = {
.ops = &agp_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_AGP,
};
/* This is the AGP 3.0 "bridge" @Bus 0 Device 1 Func 0. When using AGP 3.0, the
config in this device takes presidence. We configure both just to be safe. */
static void agp_bridge_init(device_t dev)
{
printk_debug("Setting up AGP Bridge device\n");
pci_write_config16(dev, 0x4, 0x0007);
/* Secondary Bus Number */
pci_write_config8(dev, 0x19, 0x01);
/* Subordinate Bus Number */
pci_write_config8(dev, 0x1a, 0x01);
/* IO Base */
pci_write_config8(dev, 0x1c, 0xd0);
/* IO Limit */
pci_write_config8(dev, 0x1d, 0xd0);
/* Memory Base */
pci_write_config16(dev, 0x20, 0xfb00);
/* Memory Limit */
pci_write_config16(dev, 0x22, 0xfcf0);
/* Prefetchable Memory Base */
pci_write_config16(dev, 0x24, 0xf400);
/* Prefetchable Memory Limit */
pci_write_config16(dev, 0x26, 0xf7f0);
/* Enable VGA Compatible Memory/IO Range */
pci_write_config8(dev, 0x3e, 0x08);
/* Second PCI Bus Control (see datasheet) */
pci_write_config8(dev, 0x40, 0x83);
pci_write_config8(dev, 0x41, 0x43);
pci_write_config8(dev, 0x42, 0xe2);
pci_write_config8(dev, 0x43, 0x44);
pci_write_config8(dev, 0x44, 0x34);
pci_write_config8(dev, 0x45, 0x72);
}
static const struct device_operations agp_bridge_operations = {
.read_resources = cn700_noop,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = agp_bridge_init,
.scan_bus = pci_scan_bridge,
.ops_pci = 0,
};
static const struct pci_driver agp_bridge_driver __pci_driver = {
.ops = &agp_bridge_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_BRIDGE,
};

25
src/northbridge/via/cn700/chip.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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
*/
struct northbridge_via_cn700_config
{
};
extern struct chip_operations northbridge_via_cn700_ops;

53
src/northbridge/via/cn700/cn700.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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
*/
#ifndef __ROMCC__
static void cn700_noop(){}
#endif
/* 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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src/northbridge/via/cn700/northbridge.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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 <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include <bitops.h>
#include <cpu/cpu.h>
#include "chip.h"
#include "northbridge.h"
#include "cn700.h"
static void memctrl_init(device_t dev)
{
u16 reg16;
pci_write_config8(dev, 0x86, 0x2d);
/* Set up the vga framebuffer size */
reg16 = (log2(CONFIG_VIDEO_MB) << 12) | (1 << 15);
pci_write_config16(dev, 0xa0, reg16);
/* Set up VGA timers */
pci_write_config8(dev, 0xa2, 0x44);
pci_write_config16(dev, 0xb0, 0xaa60);
pci_write_config8(dev, 0xb8, 0x08);
}
static const struct device_operations memctrl_operations = {
.read_resources = cn700_noop,
.init = memctrl_init,
};
static const struct pci_driver memctrl_driver __pci_driver = {
.ops = &memctrl_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_MEMCTRL,
};
static void pci_domain_read_resources(device_t dev)
{
struct resource *resource;
printk_spew("Entering cn700 pci_domain_read_resources.\n");
/* Initialize the system wide io space constraints */
resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0,0));
resource->limit = 0xffffUL;
resource->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
IORESOURCE_ASSIGNED;
/* Initialize the system wide memory resources constraints */
resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1,0));
resource->limit = 0xffffffffULL;
resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
IORESOURCE_ASSIGNED;
printk_spew("Leaving cn700 pci_domain_read_resources.\n");
}
static void ram_resource(device_t dev, unsigned long index,
unsigned long basek, unsigned long sizek)
{
struct resource *resource;
if (!sizek) {
return;
}
resource = new_resource(dev, index);
resource->base = ((resource_t)basek) << 10;
resource->size = ((resource_t)sizek) << 10;
resource->flags = IORESOURCE_MEM | IORESOURCE_CACHEABLE | \
IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}
static void tolm_test(void *gp, struct device *dev, struct resource *new)
{
struct resource **best_p = gp;
struct resource *best;
best = *best_p;
if (!best || (best->base > new->base)) {
best = new;
}
*best_p = best;
}
static u32 find_pci_tolm(struct bus *bus)
{
print_debug("Entering find_pci_tolm\n");
struct resource *min;
u32 tolm;
min = 0;
search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min);
tolm = 0xffffffffUL;
if (min && tolm > min->base) {
tolm = min->base;
}
print_debug("Leaving find_pci_tolm\n");
return tolm;
}
static void pci_domain_set_resources(device_t dev)
{
static const u8 ramregs[] = {0x40, 0x41, 0x42, 0x43};
device_t mc_dev;
u32 pci_tolm;
printk_spew("Entering cn700 pci_domain_set_resources.\n");
pci_tolm = find_pci_tolm(&dev->link[0]);
mc_dev = dev_find_device(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_CN700_MEMCTRL, 0);
if (mc_dev) {
unsigned long tomk, tolmk;
unsigned char rambits;
int i, idx;
for(rambits = 0, i = 0; i < ARRAY_SIZE(ramregs); i++) {
unsigned char reg;
reg = pci_read_config8(mc_dev, ramregs[i]);
rambits += reg;
}
tomk = rambits;
/* Compute the Top Of Low Memory, in Kb */
tolmk = pci_tolm >> 10;
if (tolmk >= tomk) {
/* The PCI hole does does not overlap the memory. */
tolmk = tomk;
}
/* Report the memory regions */
idx = 10;
/* TODO: Hole needed? */
ram_resource(dev, idx++, 0, 640); /* first 640k */
/* Leave a hole for vga */
ram_resource(dev, idx++, 768, (tolmk - 768 -
(CONFIG_VIDEO_MB * 1024)));
}
assign_resources(&dev->link[0]);
}
static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
{
printk_spew("Entering cn700 pci_domain_scan_bus.\n");
max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max);
return max;
}
static const struct device_operations pci_domain_ops = {
.read_resources = pci_domain_read_resources,
.set_resources = pci_domain_set_resources,
.enable_resources = enable_childrens_resources,
.init = 0,
.scan_bus = pci_domain_scan_bus,
};
static void cpu_bus_init(device_t dev)
{
initialize_cpus(&dev->link[0]);
}
static void cpu_bus_noop(device_t dev)
{
}
static const struct device_operations cpu_bus_ops = {
.read_resources = cpu_bus_noop,
.set_resources = cpu_bus_noop,
.enable_resources = cpu_bus_noop,
.init = cpu_bus_init,
.scan_bus = 0,
};
static void enable_dev(struct device *dev)
{
printk_spew("In cn700 enable_dev for device %s.\n", dev_path(dev));
/* Set the operations if it is a special bus type */
if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
dev->ops = &pci_domain_ops;
pci_set_method(dev);
}
else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
dev->ops = &cpu_bus_ops;
}
}
struct chip_operations northbridge_via_cn700_ops = {
CHIP_NAME("VIA CN700 Northbridge")
.enable_dev = enable_dev,
};

26
src/northbridge/via/cn700/northbridge.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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
*/
#ifndef NORTHBRIDGE_VIA_CN700_H
#define NORTHBRIDGE_VIA_CN700_H
extern unsigned int cn700_scan_root_bus(device_t root, unsigned int max);
#endif /* NORTHBRIDGE_VIA_CN700_H */

373
src/northbridge/via/cn700/raminit.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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 <spd.h>
#include <sdram_mode.h>
#include <delay.h>
#include "cn700.h"
//#define DEBUG_RAM_SETUP 1
#ifdef DEBUG_RAM_SETUP
#define PRINT_DEBUG_MEM(x) print_debug(x)
#define PRINT_DEBUG_MEM_HEX8(x) print_debug_hex8(x)
#define PRINT_DEBUG_MEM_HEX16(x) print_debug_hex16(x)
#define PRINT_DEBUG_MEM_HEX32(x) print_debug_hex32(x)
#define DUMPNORTH() dump_pci_device(PCI_DEV(0, 0, 0))
#else
#define PRINT_DEBUG_MEM(x)
#define PRINT_DEBUG_MEM_HEX8(x)
#define PRINT_DEBUG_MEM_HEX16(x)
#define PRINT_DEBUG_MEM_HEX32(x)
#define DUMPNORTH()
#endif
static void do_ram_command(device_t dev, u8 command, u32 addr_offset)
{
u8 reg;
/* TODO: Support for multiple DIMMs. */
reg = pci_read_config8(dev, DRAM_MISC_CTL);
reg &= 0xf8; /* Clear bits 2-0. */
reg |= command;
pci_write_config8(dev, DRAM_MISC_CTL, reg);
PRINT_DEBUG_MEM(" Sending RAM command 0x");
PRINT_DEBUG_MEM_HEX8(reg);
PRINT_DEBUG_MEM(" to 0x");
PRINT_DEBUG_MEM_HEX32(0 + addr_offset);
PRINT_DEBUG_MEM("\r\n");
read32(0 + addr_offset);
}
/**
* 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)
*/
static void c7_cpu_setup(device_t dev)
{
/* Host bus interface registers (D0F2 0x50-0x67) */
/* Request phase control */
pci_write_config8(dev, 0x50, 0x88);
/* CPU Interface Control */
pci_write_config8(dev, 0x51, 0x7a);
pci_write_config8(dev, 0x52, 0x6f);
/* Arbitration */
pci_write_config8(dev, 0x53, 0x88);
/* Miscellaneous Control */
pci_write_config8(dev, 0x54, 0x10);
pci_write_config8(dev, 0x55, 0x16);
/* Write Policy */
pci_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 */
//pci_write_config8(dev, 0x57, 0x60);//set 200MHz dram clock
/* CPU Miscellaneous Control */
pci_write_config8(dev, 0x59, 0x60);
/* Write Policy */
pci_write_config8(dev, 0x5d, 0xb2);
/* Bandwidth Timer */
pci_write_config8(dev, 0x5e, 0x88);
/* CPU Miscellaneous Control */
pci_write_config8(dev, 0x5f, 0xc7);
/* Line DRDY# Timing Control */
pci_write_config8(dev, 0x60, 0xff);
pci_write_config8(dev, 0x61, 0xff);
pci_write_config8(dev, 0x62, 0x0f);
/* QW DRDY# Timing Control */
pci_write_config8(dev, 0x63, 0xff);
pci_write_config8(dev, 0x64, 0xff);
pci_write_config8(dev, 0x65, 0x0f);
/* Read Line Burst DRDY# Timing Control */
pci_write_config8(dev, 0x66, 0xff);
pci_write_config8(dev, 0x67, 0x70);
/* Host Bus IO Circuit (See datasheet) */
/* Host Address Pullup/down Driving */
pci_write_config8(dev, 0x70, 0x33);
pci_write_config8(dev, 0x71, 0x00);
pci_write_config8(dev, 0x72, 0x33);
pci_write_config8(dev, 0x73, 0x00);
/* Miscellaneous Control */
pci_write_config8(dev, 0x74, 0x00);
/* AGTL+ I/O Circuit */
pci_write_config8(dev, 0x75, 0x28);
/* AGTL+ Compensation Status */
pci_write_config8(dev, 0x76, 0x74);
/* AGTL+ Auto Compensation Offest */
pci_write_config8(dev, 0x77, 0x00);
/* Host FSB CKG Control */
pci_write_config8(dev, 0x78, 0x0a);
/* Address/Address Clock Output Delay Control */
pci_write_config8(dev, 0x79, 0xaa);
/* Address Strobe Input Delay Control */
pci_write_config8(dev, 0x7a, 0x24);
/* Address CKG Rising/Falling Time Control */
pci_write_config8(dev, 0x7b, 0x00);
/* Address CKG Clock Rising/Falling Time Control */
pci_write_config8(dev, 0x7c, 0x00);
/* Undefined (can't remember why I did this) */
pci_write_config8(dev, 0x7d, 0x6d);
}
/**
* 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
*/
static void sdram_set_registers(const struct mem_controller *ctrl)
{
/* DQ/DQS Strength Control */
pci_write_config8(ctrl->d0f3, 0xd0, 0x88);
pci_write_config8(ctrl->d0f3, 0xd1, 0x8b);
pci_write_config8(ctrl->d0f3, 0xd2, 0x89);
/* SMM and APIC Decoding */
pci_write_config8(ctrl->d0f3, 0x86, 0x2d);
/* Driving selection */
/* DQ / DQS ODT Driving and Range Select */
pci_write_config8(ctrl->d0f3, 0xd5, 0x8a);
/* Memory Pads Driving and Range Select */
pci_write_config8(ctrl->d0f3, 0xd6, 0xaa);
/* DRAM Driving – Group DQS */
pci_write_config8(ctrl->d0f3, 0xe0, 0xee);
/* DRAM Driving – Group DQ (DQ, MPD, DQM) */
pci_write_config8(ctrl->d0f3, 0xe2, 0xac);//ba
/* DRAM Driving – Group CS */
pci_write_config8(ctrl->d0f3, 0xe4, 0x66);
/* DRAM Driving – Group MA */
pci_write_config8(ctrl->d0f3, 0xe8, 0x86);
/* DRAM Driving – Group MCLK */
pci_write_config8(ctrl->d0f3, 0xe6, 0xaa);
/* ODT (some are set with driving select above) */
/* Memory Pad ODT Pullup / Pulldown Control */
pci_write_config8(ctrl->d0f3, 0xd4, 0x0a);
/* Memory Ranks ODT Lookup Table */
pci_write_config8(ctrl->d0f3, 0xd8, 0x00);//was 1
/* Compensation Control */
pci_write_config8(ctrl->d0f3, 0xd3, 0x89);//enable auto compensation
/* MCLKO Phase Control */
pci_write_config8(ctrl->d0f3, 0x91, 0x02);
/* CS/CKE Clock Phase Control */
pci_write_config8(ctrl->d0f3, 0x92, 0x06);
/* SCMD/MA Clock Phase Control */
pci_write_config8(ctrl->d0f3, 0x93, 0x07);
/* Channel A DQS Input Capture Range Control */
pci_write_config8(ctrl->d0f3, 0x78, 0x83);
/* DQS Input Capture Range Control */
/* Set in accordance with the BIOS update note */
pci_write_config8(ctrl->d0f3, 0x7a, 0x00);
/* DQS Input Delay Offset Control */
pci_write_config8(ctrl->d0f3, 0x7c, 0x00);
/* SDRAM ODT Control */
pci_write_config8(ctrl->d0f3, 0xda, 0x80);
/* DQ/DQS CKG Output Delay Control - I */
pci_write_config8(ctrl->d0f3, 0xdc, 0xff);
/* DQ/DQS CKG Output Delay Control - II */
pci_write_config8(ctrl->d0f3, 0xdd, 0xff);
/* DQS / DQ CKG Duty Cycle Control */
pci_write_config8(ctrl->d0f3, 0xec, 0x88);
/* MCLK Output Duty Control */
pci_write_config8(ctrl->d0f3, 0xee, 0x00);
pci_write_config8(ctrl->d0f3, 0xed, 0x10);
/* DQS CKG Input Delay Control */
pci_write_config8(ctrl->d0f3, 0xef, 0x10);
pci_write_config8(ctrl->d0f3, 0x77, 0x9d);
pci_write_config8(ctrl->d0f3, 0x79, 0x83);
pci_write_config16(ctrl->d0f3, 0x88, 0x0020);
pci_write_config8(ctrl->d0f4, 0xa7, 0x80);
/* VLink Control */
pci_write_config8(ctrl->d0f7, 0xb0, 0x05);
pci_write_config8(ctrl->d0f7, 0xb1, 0x01);
/* Memory base */
pci_write_config16(ctrl->d1f0, 0x20, 0xfb00);
/* Memory limit */
pci_write_config16(ctrl->d1f0, 0x22, 0xfcf0);
/* Prefetch memory base */
pci_write_config16(ctrl->d1f0, 0x24, 0xf400);
/* Prefetch memory limit */
pci_write_config16(ctrl->d1f0, 0x26, 0xf7f0);
/* PCI to PCI bridge control */
pci_write_config16(ctrl->d1f0, 0x3e, 0x0008);
/* CPU to PCI flow control 1 */
pci_write_config8(ctrl->d1f0, 0x40, 0x83);
pci_write_config8(ctrl->d1f0, 0x41, 0xc3);//clear reset error, set to 43
pci_write_config8(ctrl->d1f0, 0x42, 0xe2);
pci_write_config8(ctrl->d1f0, 0x43, 0x44);
pci_write_config8(ctrl->d1f0, 0x44, 0x34);
pci_write_config8(ctrl->d1f0, 0x45, 0x72);
/* Disable cross bank/multi page mode */
pci_write_config8(ctrl->d0f3, DDR_PAGE_CTL, 0x80);
pci_write_config8(ctrl->d0f3, DRAM_REFRESH_COUNTER, 0x00);
/* Set WR=5 and RFC */
pci_write_config8(ctrl->d0f3, 0x61, 0xc7);
/* Set CAS=5 */
pci_write_config8(ctrl->d0f3, 0x62, 0xaf);
pci_write_config8(ctrl->d0f3, 0x63, 0xca);
/* Set to DDR2 sdram, BL=8 (0xc8, 0xc0 for bl=4) */
pci_write_config8(ctrl->d0f3, 0x6c, 0xc8);
/* Allow manual dll reset */
pci_write_config8(ctrl->d0f3, 0x6b, 0x10);
pci_write_config8(ctrl->d0f3, 0x6e, 0x89);
pci_write_config8(ctrl->d0f3, 0x67, 0x50);
pci_write_config8(ctrl->d0f3, 0x65, 0xd9);
/* Only enable bank 1, for now */
/* TODO: Multiple, dynamically controlled bank enables */
pci_write_config8(ctrl->d0f3, 0x54, 0x80);
pci_write_config8(ctrl->d0f3, 0x55, 0x00);
/* Set to 2T, MA Map type 1.
* TODO: Needs to become dynamic */
pci_write_config16(ctrl->d0f3, 0x50, 0x0020);
/* BA0-2 Selection. Don't mess with */
pci_write_config8(ctrl->d0f3, 0x52, 0x33);
pci_write_config8(ctrl->d0f3, 0x53, 0x3f);
/* Disable bank interleaving. This feature seems useless anyways */
pci_write_config32(ctrl->d0f3, 0x58, 0x00000000);
pci_write_config8(ctrl->d0f3, 0x88, 0x08);
/* Some DQS control stuffs */
pci_write_config8(ctrl->d0f3, 0x74, 0x04);
pci_write_config8(ctrl->d0f3, 0x75, 0x04);
pci_write_config8(ctrl->d0f3, 0x76, 0x00);
}
/**
* Set up dram size according to spd data. Eventually, DRAM timings should be
* done in a similar manner.
*
* @param ctrl The northbridge devices and spd addresses.
*/
static void sdram_set_spd_registers(const struct mem_controller *ctrl)
{
u8 spd_data, spd_data2;
/* DRAM Bank Size */
spd_data = spd_read_byte(ctrl->channel0[0],
SPD_DENSITY_OF_EACH_ROW_ON_MODULE);
/* I know this seems weird. Blame JEDEC/Via. */
if(spd_data >= 0x10)
spd_data = spd_data >> 1;
else
spd_data = spd_data << 1;
/* Check for double sided dimm and adjust size accordingly */
spd_data2 = spd_read_byte(ctrl->channel0[0], SPD_NUM_BANKS_PER_SDRAM);
/* There should be 4 banks on a single sided dimm,
* or 8 on a dual sided one */
spd_data = spd_data * (spd_data2 / 4);
pci_write_config8(ctrl->d0f3, 0x40, spd_data);
/* TODO: The rest of the DIMMs */
}
static void sdram_enable(device_t dev)
{
int i;
/* 1. Apply NOP. */
PRINT_DEBUG_MEM("RAM Enable 1: Apply NOP\r\n");
do_ram_command(dev, RAM_COMMAND_NOP, 0);
udelay(200);
/* 2. Precharge all. */
PRINT_DEBUG_MEM("RAM Enable 2: Precharge all\r\n");
do_ram_command(dev, RAM_COMMAND_PRECHARGE, 0);
/* 3. Mode register set. */
PRINT_DEBUG_MEM("RAM Enable 4: Mode register set\r\n");
do_ram_command(dev, RAM_COMMAND_MRS, 0x2000);//enable dll
do_ram_command(dev, RAM_COMMAND_MRS, 0x800);//reset dll
/* 4. Precharge all again. */
PRINT_DEBUG_MEM("RAM Enable 2: Precharge all\r\n");
do_ram_command(dev, RAM_COMMAND_PRECHARGE, 0);
/* 5. Perform 8 refresh cycles. Wait tRC each time. */
PRINT_DEBUG_MEM("RAM Enable 3: CBR\r\n");
do_ram_command(dev, RAM_COMMAND_CBR, 0);
/* First read is actually done by do_ram_command */
for(i = 0; i < 7; i++) {
udelay(100);
read32(0);
}
/* 6. Mode register set. */
PRINT_DEBUG_MEM("RAM Enable 4: Mode register set\r\n");
//safe value for now, BL=8, WR=5, CAS=5
/* (E)MRS values are from the BPG. No direct explanation is given, but
* they should somehow conform to the JEDEC DDR2 SDRAM Specification
* (JESD79-2C). */
do_ram_command(dev, RAM_COMMAND_MRS, 0x0022d8);
/* 7. Mode register set. */
PRINT_DEBUG_MEM("RAM Enable 4: Mode register set\r\n");
do_ram_command(dev, RAM_COMMAND_MRS, 0x21c20);//default OCD calibration
do_ram_command(dev, RAM_COMMAND_MRS, 0x20020);//exit calibration mode
/* 8. Normal operation */
PRINT_DEBUG_MEM("RAM Enable 5: Normal operation\r\n");
do_ram_command(dev, RAM_COMMAND_NORMAL, 0);
/* Enable multipage mode. */
pci_write_config8(dev, DDR_PAGE_CTL, 0x83);
/* Enable refresh. */
pci_write_config8(dev, 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_write_config8(dev, CH_A_DQS_OUTPUT_DELAY, 0x00);
pci_write_config8(dev, 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 LB will have a fit. */
pci_write_config16(dev, 0xa0, (1 << 15));
pci_write_config16(dev, 0xa4, 0x0010);
}

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src/northbridge/via/cn700/raminit.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey_osgood@verizon.net>
*
* 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
*/
#ifndef RAMINIT_H
#define RAMINIT_H
#define DIMM_SOCKETS 1 //Only one works, for now.
struct mem_controller {
device_t d0f0, d0f2, d0f3, d0f4, d0f7, d1f0;
u8 channel0[DIMM_SOCKETS];
};

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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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
*/
/* Note: Some of the VGA control registers are located on the memory controller.
Registers are set both in raminit.c and northbridge.c */
#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include <bitops.h>
#include <cpu/cpu.h>
#include "chip.h"
#include "northbridge.h"
#include "cn700.h"
void write_protect_vgabios(void)
{
//Don't bother for now
}
static void vga_init(device_t dev)
{
u8 reg8;
print_debug("Copying BOCHS Bios to 0xf000\n");
/* Copy the BOCHs BIOS from 0xFFFFFFFF - ROM_SIZE - BOCHs size (64k) to 0xf0000
This is for compatibility with the VGA ROM's BIOS callbacks */
memcpy(0xf0000, (0xFFFFFFFF - ROM_SIZE - 0x10000), 0x10000);
printk_debug("Initializing VGA\n");
pci_write_config8(dev, 0x3c, 0xb);
/* Set memory rate to 200MHz */
outb(0x3d, CRTM_INDEX);
reg8 = inb(CRTM_DATA);
reg8 &= 0x0f;
reg8 |= (0x1 << 4);
outb(0x3d, CRTM_INDEX);
outb(reg8, CRTM_DATA);
/* Set framebuffer size */
reg8 = (CONFIG_VIDEO_MB / 4);
outb(0x39, SR_INDEX);
outb(reg8, SR_DATA);
pci_write_config8(dev, 0x04, 0x07);
pci_write_config8(dev, 0x0d, 0x20);
pci_write_config32(dev,0x10, 0xf4000008);
pci_write_config32(dev,0x14, 0xfb000000);
pci_write_config8(dev, 0x3e, 0x02);
pci_write_config8(dev, 0x3c, 0x0a);
printk_debug("INSTALL REAL-MODE IDT\n");
setup_realmode_idt();
printk_debug("DO THE VGA BIOS\n");
do_vgabios();
/* VGA seems to work without this, but crash & burn with it */
//printk_debug("Enable VGA console\n");
//vga_enable_console();
/* It's not clear if these need to be programmed before or after
* the VGA bios runs. Try both, clean up later */
/* Set memory rate to 200MHz */
outb(0x3d, CRTM_INDEX);
reg8 = inb(CRTM_DATA);
reg8 &= 0x0f;
reg8 |= (0x1 << 4);
outb(0x3d, CRTM_INDEX);
outb(reg8, CRTM_DATA);
/* Set framebuffer size (again) */
reg8 = (CONFIG_VIDEO_MB / 4);
outb(0x39, SR_INDEX);
outb(reg8, SR_DATA);
/* Clear the BOCHs Bios out of memory, so it doesn't confuse linux */
memset(0xf0000, 0, 0x10000);
}
static void vga_read_resources(device_t dev)
{
dev->rom_address = 0xfff80000;
dev->on_mainboard=1;
pci_dev_read_resources(dev);
}
static const struct device_operations vga_operations = {
.read_resources = vga_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = vga_init,
.ops_pci = 0,
};
static const struct pci_driver vga_driver __pci_driver = {
.ops = &vga_operations,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_CN700_VGA,
};

839
src/northbridge/via/cn700/vgabios.c Normal file
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#include <console/console.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#undef __KERNEL__
#include <arch/io.h>
//#include <printk.h>
#include <string.h>
#include "vgachip.h"
/* vgabios.c. Derived from: */
/*------------------------------------------------------------ -*- C -*-
* 2 Kernel Monte a.k.a. Linux loading Linux on x86
*
* Erik Arjan Hendriks <hendriks@lanl.gov>
*
* This version is a derivative of the original two kernel monte
* which is (C) 2000 Scyld.
*
* Copyright (C) 2000 Scyld Computing Corporation
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Portions related to the alpha architecture are:
*
* Copyright(C) 2001 University of California. LA-CC Number 01-67.
* This software has been authored by an employee or employees of the
* University of California, operator of the Los Alamos National
* Laboratory under Contract No. W-7405-ENG-36 with the U.S.
* Department of Energy. The U.S. Government has rights to use,
* reproduce, and distribute this software. If the software is
* modified to produce derivative works, such modified software should
* be clearly marked, so as not to confuse it with the version
* available from LANL.
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by
* reference to http://www.gnu.org/licenses/gpl.html.
*
* This software is provided by the author(s) "as is" and any express
* or implied warranties, including, but not limited to, the implied
* warranties of merchantability and fitness for a particular purpose
* are disclaimed. In no event shall the author(s) be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability,
* whether in contract, strict liability, or tort (including
* negligence or otherwise) arising in any way out of the use of this
* software, even if advised of the possibility of such damage.
*
* $Id: vgabios.c,v 1.5 2004/10/06 17:33:52 rminnich Exp $
*--------------------------------------------------------------------*/
/* Modified to be a self sufficient plug in so that it can be used
without reliance on other parts of coreboot's core
(C) 2005 Nick.Barker9@btinternet.com
Used initially for epia-m where there are problems getting the bios
emulator to successfully run this bios.
*/
/* Declare a temporary global descriptor table - necessary because the
Core part of the bios no longer sets up any 16 bit segments */
__asm__ (
/* pointer to original gdt */
"gdtarg: \n"
" .word gdt_limit \n"
" .long gdt \n"
/* compute the table limit */
"__mygdt_limit = __mygdt_end - __mygdt - 1 \n"
"__mygdtaddr: \n"
" .word __mygdt_limit \n"
" .long __mygdt \n"
"__mygdt: \n"
/* selgdt 0, unused */
" .word 0x0000, 0x0000 \n"
" .byte 0x00, 0x00, 0x00, 0x00 \n"
/* selgdt 8, unused */
" .word 0x0000, 0x0000 \n"
" .byte 0x00, 0x00, 0x00, 0x00 \n"
/* selgdt 0x10, flat code segment */
" .word 0xffff, 0x0000 \n"
" .byte 0x00, 0x9b, 0xcf, 0x00 \n"
/* selgdt 0x18, flat data segment */
" .word 0xffff, 0x0000 \n"
" .byte 0x00, 0x93, 0xcf, 0x00 \n"
/* selgdt 0x20, unused */
" .word 0x0000, 0x0000 \n"
" .byte 0x00, 0x00, 0x00, 0x00 \n"
/* selgdt 0x28 16-bit 64k code at 0x00000000 */
" .word 0xffff, 0x0000 \n"
" .byte 0, 0x9a, 0, 0 \n"
/* selgdt 0x30 16-bit 64k data at 0x00000000 */
" .word 0xffff, 0x0000 \n"
" .byte 0, 0x92, 0, 0 \n"
"__mygdt_end: \n"
);
/* Declare a pointer to where our idt is going to be i.e. at mem zero */
__asm__ ("__myidt: \n"
/* 16-bit limit */
" .word 1023 \n"
/* 24-bit base */
" .long 0 \n"
" .word 0 \n"
);
/* The address arguments to this function are PHYSICAL ADDRESSES */
static void real_mode_switch_call_vga(unsigned long devfn)
{
__asm__ __volatile__ (
// paranoia -- does ecx get saved? not sure. This is
// the easiest safe thing to do.
" pushal \n"
/* save the stack */
" mov %esp, __stack \n"
" jmp 1f \n"
"__stack: .long 0 \n"
"1:\n"
/* get devfn into %ecx */
" movl %esp, %ebp \n"
" movl 8(%ebp), %ecx \n"
/* load 'our' gdt */
" lgdt %cs:__mygdtaddr \n"
/* This configures CS properly for real mode. */
" ljmp $0x28, $__rms_16bit\n"
"__rms_16bit: \n"
" .code16 \n"
/* 16 bit code from here on... */
/* Load the segment registers w/ properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off. */
" mov $0x30, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax \n"
" movl %eax, %cr0 \n"
/* Now really going into real mode */
" ljmp $0, $__rms_real\n"
"__rms_real: \n"
/* put the stack at the end of page zero.
* that way we can easily share it between real and protected,
* since the 16-bit ESP at segment 0 will work for any case.
/* Setup a stack */
" mov $0x0, %ax \n"
" mov %ax, %ss \n"
" movl $0x1000, %eax \n"
" movl %eax, %esp \n"
/* Load our 16 it idt */
" xor %ax, %ax \n"
" mov %ax, %ds \n"
" lidt __myidt \n"
/* Dump zeros in the other segregs */
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov $0x40, %ax \n"
" mov %ax, %ds \n"
" mov %cx, %ax \n"
/* run VGA BIOS at 0xc000:0003 */
" lcall $0xc000, $0x0003\n"
/* if we got here, just about done.
* Need to get back to protected mode */
" movl %cr0, %eax \n"
" orl $0x0000001, %eax\n" /* PE = 1 */
" movl %eax, %cr0 \n"
/* Now that we are in protected mode jump to a 32 bit code segment. */
" data32 ljmp $0x10, $vgarestart\n"
"vgarestart:\n"
" .code32\n"
" movw $0x18, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
/* restore proper gdt and idt */
" lgdt %cs:gdtarg \n"
" lidt idtarg \n"
".globl vga_exit \n"
"vga_exit: \n"
" mov __stack, %esp \n"
" popal \n"
);
}
__asm__ (".text\n""real_mode_switch_end:\n");
extern char real_mode_switch_end[];
/* call vga bios int 10 function 0x4f14 to enable main console
epia-m does not always autosence the main console so forcing it on is good !! */
void vga_enable_console()
{
__asm__ __volatile__ (
/* paranoia -- does ecx get saved? not sure. This is
* the easiest safe thing to do. */
" pushal \n"
/* save the stack */
" mov %esp, __stack \n"
/* load 'our' gdt */
" lgdt %cs:__mygdtaddr \n"
/* This configures CS properly for real mode. */
" ljmp $0x28, $__vga_ec_16bit\n"
"__vga_ec_16bit: \n"
" .code16 \n"
/* 16 bit code from here on... */
/* Load the segment registers w/ properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off. */
" mov $0x30, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax\n"
" movl %eax, %cr0 \n"
/* Now really going into real mode */
" ljmp $0, $__vga_ec_real \n"
"__vga_ec_real: \n"
/* put the stack at the end of page zero.
* that way we can easily share it between real and protected,
* since the 16-bit ESP at segment 0 will work for any case.
/* Setup a stack */
" mov $0x0, %ax \n"
" mov %ax, %ss \n"
" movl $0x1000, %eax \n"
" movl %eax, %esp \n"
/* debugging for RGM */
" mov $0x11, %al \n"
" outb %al, $0x80 \n"
/* Load our 16 it idt */
" xor %ax, %ax \n"
" mov %ax, %ds \n"
" lidt __myidt \n"
/* Dump zeros in the other segregs */
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
/* ask bios to enable main console */
/* set up for int 10 call - values found from X server
* bios call routines */
" movw $0x4f14,%ax \n"
" movw $0x8003,%bx \n"
" movw $1, %cx \n"
" movw $0, %dx \n"
" movw $0, %di \n"
" int $0x10 \n"
" movb $0x55, %al \n"
" outb %al, $0x80 \n"
/* if we got here, just about done.
* Need to get back to protected mode */
" movl %cr0, %eax \n"
" orl $0x0000001, %eax\n" /* PE = 1 */
" movl %eax, %cr0 \n"
/* Now that we are in protected mode jump to a 32 bit code segment. */
" data32 ljmp $0x10, $vga_ec_restart\n"
"vga_ec_restart:\n"
" .code32\n"
" movw $0x18, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
/* restore proper gdt and idt */
" lgdt %cs:gdtarg \n"
" lidt idtarg \n"
" .globl vga__ec_exit \n"
"vga_ec_exit:\n"
" mov __stack, %esp \n"
" popal\n"
);
}
void do_vgabios(void)
{
device_t dev;
unsigned long busdevfn;
unsigned int rom = 0;
unsigned char *buf;
unsigned int size = 64*1024;
int i;
/* clear vga bios data area */
for (i = 0x400; i < 0x500; i++) {
*(unsigned char *) i = 0;
}
dev = dev_find_class(PCI_CLASS_DISPLAY_VGA<<8 , 0);
if (!dev) {
printk_debug("NO VGA FOUND\n");
return;
}
printk_debug("found VGA: vid=%x, did=%x\n", dev->vendor, dev->device);
/* declare rom address here - keep any config data out of the way
* of core LXB stuff */
rom = 0xfff80000;
pci_write_config32(dev, PCI_ROM_ADDRESS, rom|1);
printk_debug("rom base, size: %x\n", rom);
buf = (unsigned char *) rom;
if ((buf[0] == 0x55) && (buf[1] == 0xaa)) {
memcpy((void *) 0xc0000, buf, size);
write_protect_vgabios(); // in northbridge
// check signature again
buf = (unsigned char *) 0xc0000;
if (buf[0]==0x55 && buf[1]==0xAA) {
busdevfn = (dev->bus->secondary << 8) | dev->path.u.pci.devfn;
printk_debug("bus/devfn = %#x\n", busdevfn);
real_mode_switch_call_vga(busdevfn);
} else
printk_debug("Failed to copy VGA BIOS to 0xc0000\n");
} else
printk_debug("BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]);
pci_write_config32(dev, PCI_ROM_ADDRESS, 0);
}
// we had hoped to avoid this.
// this is a stub IDT only. It's main purpose is to ignore calls
// to the BIOS.
// no longer. Dammit. We have to respond to these.
struct realidt {
unsigned short offset, cs;
};
// from a handy writeup that andrey found.
// handler.
// There are some assumptions we can make here.
// First, the Top Of Stack (TOS) is located on the top of page zero.
// we can share this stack between real and protected mode.
// that simplifies a lot of things ...
// we'll just push all the registers on the stack as longwords,
// and pop to protected mode.
// second, since this only ever runs as part of coreboot,
// we know all the segment register values -- so we don't save any.
// keep the handler that calls things small. It can do a call to
// more complex code in coreboot itself. This helps a lot as we don't
// have to do address fixup in this little stub, and calls are absolute
// so the handler is relocatable.
void handler(void)
{
__asm__ __volatile__ (
" .code16 \n"
"idthandle: \n"
" pushal \n"
" movb $0, %al \n"
" ljmp $0, $callbiosint16\n"
"end_idthandle: \n"
" .code32 \n"
);
}
void debughandler(void)
{
__asm__ __volatile__ (
" .code16 \n"
"debughandle: \n"
" pushw %cx \n"
" movw $250, %cx \n"
"dbh1: \n"
" loop dbh1 \n"
" popw %cx \n"
" iret \n"
"end_debughandle: \n"
".code32 \n"
);
}
// Calling conventions. The first C function is called with this stuff
// on the stack. They look like value parameters, but note that if you
// modify them they will go back to the INTx function modified.
// the C function will call the biosint function with these as
// REFERENCE parameters. In this way, we can easily get
// returns back to the INTx caller (i.e. vgabios)
void callbiosint(void)
{
__asm__ __volatile__ (
" .code16 \n"
"callbiosint16: \n"
" push %ds \n"
" push %es \n"
" push %fs \n"
" push %gs \n"
// clean up the int #. To save space we put it in the lower
// byte. But the top 24 bits are junk.
" andl $0xff, %eax\n"
// this push does two things:
// - put the INT # on the stack as a parameter
// - provides us with a temp for the %cr0 mods.
" pushl %eax \n"
" movl %cr0, %eax\n"
" orl $0x00000001, %eax\n" /* PE = 1 */
" movl %eax, %cr0\n"
/* Now that we are in protected mode jump to a 32 bit code segment. */
" data32 ljmp $0x10, $biosprotect\n"
"biosprotect: \n"
" .code32 \n"
" movw $0x18, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
" lidt idtarg \n"
" call biosint \n"
// back to real mode ...
" ljmp $0x28, $__rms_16bit2\n"
"__rms_16bit2: \n"
" .code16 \n"
/* 16 bit code from here on... */
/* Load the segment registers w/ properly configured segment
* descriptors. They will retain these configurations (limits,
* writability, etc.) once protected mode is turned off. */
" mov $0x30, %ax \n"
" mov %ax, %ds \n"
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov %ax, %ss \n"
/* Turn off protection (bit 0 in CR0) */
" movl %cr0, %eax \n"
" andl $0xFFFFFFFE, %eax \n"
" movl %eax, %cr0 \n"
/* Now really going into real mode */
" ljmp $0, $__rms_real2 \n"
"__rms_real2: \n"
/* Setup a stack
* FixME: where is esp? */
" mov $0x0, %ax \n"
" mov %ax, %ss \n"
/* ebugging for RGM */
" mov $0x11, %al \n"
" outb %al, $0x80 \n"
/* Load our 16 it idt */
" xor %ax, %ax \n"
" mov %ax, %ds \n"
" lidt __myidt \n"
/* Dump zeros in the other segregs */
" mov %ax, %es \n"
" mov %ax, %fs \n"
" mov %ax, %gs \n"
" mov $0x40, %ax \n"
" mov %ax, %ds \n"
/* pop the INT # that you pushed earlier */
" popl %eax \n"
" pop %gs \n"
" pop %fs \n"
" pop %es \n"
" pop %ds \n"
" popal \n"
" iret \n"
" .code32 \n"
);
}
enum {
PCIBIOS = 0x1a,
MEMSIZE = 0x12
};
int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
unsigned long *pecx, unsigned long *peax, unsigned long *pflags);
int handleint21(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
unsigned long *pecx, unsigned long *peax, unsigned long *pflags
);
extern void vga_exit(void);
int biosint(unsigned long intnumber,
unsigned long gsfs, unsigned long dses,
unsigned long edi, unsigned long esi,
unsigned long ebp, unsigned long esp,
unsigned long ebx, unsigned long edx,
unsigned long ecx, unsigned long eax,
unsigned long cs_ip, unsigned short stackflags)
{
unsigned long ip;
unsigned long cs;
unsigned long flags;
int ret = -1;
ip = cs_ip & 0xffff;
cs = cs_ip >> 16;
flags = stackflags;
printk_debug("biosint: INT# 0x%lx\n", intnumber);
printk_debug("biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
eax, ebx, ecx, edx);
printk_debug("biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n",
ebp, esp, edi, esi);
printk_debug("biosint: ip 0x%x cs 0x%x flags 0x%x\n",
ip, cs, flags);
// cases in a good compiler are just as good as your own tables.
switch (intnumber) {
case 0 ... 15:
// These are not BIOS service, but the CPU-generated exceptions
printk_info("biosint: Oops, exception %u\n", intnumber);
if (esp < 0x1000) {
printk_debug("Stack contents: ");
while (esp < 0x1000) {
printk_debug("0x%04x ", *(unsigned short *) esp);
esp += 2;
}
printk_debug("\n");
}
printk_debug("biosint: Bailing out\n");
// "longjmp"
vga_exit();
break;
case PCIBIOS:
ret = pcibios( &edi, &esi, &ebp, &esp,
&ebx, &edx, &ecx, &eax, &flags);
break;
case MEMSIZE:
// who cares.
eax = 64 * 1024;
ret = 0;
break;
case 0x15:
ret=handleint21( &edi, &esi, &ebp, &esp,
&ebx, &edx, &ecx, &eax, &flags);
break;
default:
printk_info("BIOSINT: Unsupport int #0x%x\n",
intnumber);
break;
}
if (ret)
flags |= 1; // carry flags
else
flags &= ~1;
stackflags = flags;
return ret;
}
void setup_realmode_idt(void)
{
extern unsigned char idthandle, end_idthandle;
extern unsigned char debughandle, end_debughandle;
int i;
struct realidt *idts = (struct realidt *) 0;
int codesize = &end_idthandle - &idthandle;
unsigned char *intbyte, *codeptr;
// for each int, we create a customized little handler
// that just pushes %ax, puts the int # in %al,
// then calls the common interrupt handler.
// this necessitated because intel didn't know much about
// architecture when they did the 8086 (it shows)
// (hmm do they know anymore even now :-)
// obviously you can see I don't really care about memory
// efficiency. If I did I would probe back through the stack
// and get it that way. But that's really disgusting.
for (i = 0; i < 256; i++) {
idts[i].cs = 0;
codeptr = (char*) 4096 + i * codesize;
idts[i].offset = (unsigned) codeptr;
memcpy(codeptr, &idthandle, codesize);
intbyte = codeptr + 3;
*intbyte = i;
}
// fixed entry points
// VGA BIOSes tend to hardcode f000:f065 as the previous handler of
// int10.
// calling convention here is the same as INTs, we can reuse
// the int entry code.
codeptr = (char*) 0xff065;
memcpy(codeptr, &idthandle, codesize);
intbyte = codeptr + 3;
*intbyte = 0x42; /* int42 is the relocated int10 */
/* debug handler - useful to set a programmable delay between instructions if the
TF bit is set upon call to real mode */
idts[1].cs = 0;
idts[1].offset = 16384;
memcpy(16384, &debughandle, &end_debughandle - &debughandle);
}
enum {
CHECK = 0xb001,
FINDDEV = 0xb102,
READCONFBYTE = 0xb108,
READCONFWORD = 0xb109,
READCONFDWORD = 0xb10a,
WRITECONFBYTE = 0xb10b,
WRITECONFWORD = 0xb10c,
WRITECONFDWORD = 0xb10d
};
// errors go in AH. Just set these up so that word assigns
// will work. KISS.
enum {
PCIBIOS_NODEV = 0x8600,
PCIBIOS_BADREG = 0x8700
};
int
pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
unsigned long *pecx, unsigned long *peax, unsigned long *pflags)
{
unsigned long edi = *pedi;
unsigned long esi = *pesi;
unsigned long ebp = *pebp;
unsigned long esp = *pesp;
unsigned long ebx = *pebx;
unsigned long edx = *pedx;
unsigned long ecx = *pecx;
unsigned long eax = *peax;
unsigned long flags = *pflags;
unsigned short func = (unsigned short) eax;
int retval = 0;
unsigned short devid, vendorid, devfn;
short devindex; /* Use short to get rid of garbage in upper half of 32-bit register */
unsigned char bus;
device_t dev;
switch(func) {
case CHECK:
*pedx = 0x4350;
*pecx = 0x2049;
retval = 0;
break;
case FINDDEV:
{
devid = *pecx;
vendorid = *pedx;
devindex = *pesi;
dev = 0;
while ((dev = dev_find_device(vendorid, devid, dev))) {
if (devindex <= 0)
break;
devindex--;
}
if (dev) {
unsigned short busdevfn;
*peax = 0;
// busnum is an unsigned char;
// devfn is an int, so we mask it off.
busdevfn = (dev->bus->secondary << 8)
| (dev->path.u.pci.devfn & 0xff);
printk_debug("0x%x: return 0x%x\n", func, busdevfn);
*pebx = busdevfn;
retval = 0;
} else {
*peax = PCIBIOS_NODEV;
retval = -1;
}
}
break;
case READCONFDWORD:
case READCONFWORD:
case READCONFBYTE:
case WRITECONFDWORD:
case WRITECONFWORD:
case WRITECONFBYTE:
{
unsigned long dword;
unsigned short word;
unsigned char byte;
unsigned char reg;
devfn = *pebx & 0xff;
bus = *pebx >> 8;
reg = *pedi;
dev = dev_find_slot(bus, devfn);
if (! dev) {
printk_debug("0x%x: BAD DEVICE bus %d devfn 0x%x\n", func, bus, devfn);
// idiots. the pcibios guys assumed you'd never pass a bad bus/devfn!
*peax = PCIBIOS_BADREG;
retval = -1;
}
switch(func) {
case READCONFBYTE:
byte = pci_read_config8(dev, reg);
*pecx = byte;
break;
case READCONFWORD:
word = pci_read_config16(dev, reg);
*pecx = word;
break;
case READCONFDWORD:
dword = pci_read_config32(dev, reg);
*pecx = dword;
break;
case WRITECONFBYTE:
byte = *pecx;
pci_write_config8(dev, reg, byte);
break;
case WRITECONFWORD:
word = *pecx;
pci_write_config16(dev, reg, word);
break;
case WRITECONFDWORD:
dword = *pecx;
pci_write_config32(dev, reg, dword);
break;
}
if (retval)
retval = PCIBIOS_BADREG;
printk_debug("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n",
func, bus, devfn, reg, *pecx);
*peax = 0;
retval = 0;
}
break;
default:
printk_err("UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
break;
}
return retval;
}
int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp,
unsigned long *esp, unsigned long *ebx, unsigned long *edx,
unsigned long *ecx, unsigned long *eax, unsigned long *flags)
{
int res=-1;
switch(*eax&0xffff)
{
case 0x5f19:
break;
case 0x5f18:
*eax=0x5f;
*ebx=0x545; // MCLK = 133, 32M frame buffer, 256 M main memory
*ecx=0x060;
res=0;
break;
case 0x5f00:
*eax = 0x8600;
break;
case 0x5f01:
*eax = 0x5f;
*ecx = (*ecx & 0xffffff00 ) | 2; // panel type = 2 = 1024 * 768
res = 0;
break;
case 0x5f02:
*eax=0x5f;
*ebx= (*ebx & 0xffff0000) | 2;
*ecx= (*ecx & 0xffff0000) | 0x401; // PAL + crt only
*edx= (*edx & 0xffff0000) | 0; // TV Layout - default
res=0;
break;
case 0x5f0f:
*eax=0x860f;
break;
}
return res;
}

30
src/northbridge/via/cn700/vgachip.h Normal file
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@ -0,0 +1,30 @@
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com>
*
* 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
*/
#ifndef _PC80_VGABIOS
#define _PC80_VGABIOS
extern struct chip_control pc80_vgabios_control;
struct pc80_vgabios_config {
int nothing;
};
#endif /* _PC80_VGABIOS */