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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
* Copyright (C) 2011 Alexandru Gagniuc <mr.nuke.me@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; version 2 of the License.
*
* 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.
*/
/*
* Seems the link and width of HT link needs to be setup too, you need to
* generate PCI reset or LDTSTOP to apply.
*/
#include <stdlib.h>
#include <cbmem.h>
#include <arch/io.h>
#include <arch/acpi.h>
#include "k8x8xx.h"
/* The 256 bytes of NVRAM for S3 storage, 256B aligned */
#define K8T890_NVRAM_IO_BASE 0xf00
#define K8T890_MULTIPLE_FN_EN 0x4f
/* AMD K8 LDT0, LDT1, LDT2 Link Control Registers */
static u8 ldtreg[3] = {0x86, 0xa6, 0xc6};
#if IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800_OLD)
#define K8X8XX_HT_CFG_BASE 0xc0
#else
#define K8X8XX_HT_CFG_BASE 0x60
#endif
/* This functions sets KT890 link frequency and width to same values as
* it has been setup on K8 side, by AMD NB init.
* This will not work for K8T800_OLD, which has a slightly different
* register arrangement (device 3188)
*/
u8 k8t890_early_setup_ht(void)
{
u8 awidth, afreq, cldtfreq;
u8 cldtwidth_in, cldtwidth_out, vldtwidth_in, vldtwidth_out, ldtnr, width;
u16 vldtcaps;
#if !IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800_OLD)
u8 reg;
/* hack, enable NVRAM in chipset */
pci_write_config8(PCI_DEV(0, 0x0, 0), K8T890_MULTIPLE_FN_EN, 0x01);
/*
* NVRAM I/O base at K8T890_NVRAM_IO_BASE
*/
pci_write_config8(PCI_DEV(0, 0x0, 2), 0xa2, (K8T890_NVRAM_IO_BASE >> 8));
reg = pci_read_config8(PCI_DEV(0, 0x0, 2), 0xa1);
reg |= 0x1;
pci_write_config8(PCI_DEV(0, 0x0, 2), 0xa1, reg);
#endif
/* check if connected non coherent, initcomplete (find the SB on K8 side) */
ldtnr = 0;
if (0x7 == pci_read_config8(PCI_DEV(0, 0x18, 0), 0x98)) {
ldtnr = 0;
} else if (0x7 == pci_read_config8(PCI_DEV(0, 0x18, 0), 0xb8)) {
ldtnr = 1;
} else if (0x7 == pci_read_config8(PCI_DEV(0, 0x18, 0), 0xd8)) {
ldtnr = 2;
}
#if IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8M800)
printk(BIOS_DEBUG, "K8M800 found at LDT ");
#elif IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800)
printk(BIOS_DEBUG, "K8T800 found at LDT ");
#elif IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800_OLD)
printk(BIOS_DEBUG, "K8T800_OLD found at LDT ");
pci_write_config8(PCI_DEV(0, 0x0, 0), 0x64, 0x00);
pci_write_config8(PCI_DEV(0, 0x0, 0), 0xdd, 0x50);
#elif IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800PRO)
printk(BIOS_DEBUG, "K8T800 Pro found at LDT ");
#elif IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8M890)
printk(BIOS_DEBUG, "K8M890 found at LDT ");
/* K8M890 fix HT delay */
pci_write_config8(PCI_DEV(0, 0x0, 2), 0xab, 0x22);
#elif IS_ENABLED(CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T890)
printk(BIOS_DEBUG, "K8T890 found at LDT ");
#endif
printk(BIOS_DEBUG, "%02x", ldtnr);
/* get the maximum widths for both sides */
cldtwidth_in = pci_read_config8(PCI_DEV(0, 0x18, 0), ldtreg[ldtnr]) & 0x7;
cldtwidth_out = (pci_read_config8(PCI_DEV(0, 0x18, 0), ldtreg[ldtnr]) >> 4) & 0x7;
vldtwidth_in = pci_read_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0x6) & 0x7;
vldtwidth_out = (pci_read_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0x6) >> 4) & 0x7;
width = MIN(MIN(MIN(cldtwidth_out, cldtwidth_in), vldtwidth_out), vldtwidth_in);
printk(BIOS_DEBUG, " Agreed on width: %02x", width);
awidth = pci_read_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0x7);
/* Update the desired HT LNK to match AMD NB max from VIA NB is 0x1 */
width = (width == 0x01) ? 0x11 : 0x00;
pci_write_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0x7, width);
/* Get programmed HT freq at base 0x89 */
cldtfreq = pci_read_config8(PCI_DEV(0, 0x18, 0), ldtreg[ldtnr] + 3) & 0xf;
printk(BIOS_DEBUG, " CPU programmed to HT freq: %02x", cldtfreq);
vldtcaps = pci_read_config16(PCI_DEV(0, 0, 0), K8X8XX_HT_CFG_BASE + 0xe);
printk(BIOS_DEBUG, " VIA HT caps: %04x", vldtcaps);
if (!(vldtcaps & (1 << cldtfreq ))) {
die("Chipset does not support desired HT frequency\n");
}
afreq = pci_read_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0xd);
pci_write_config8(PCI_DEV(0, 0x0, 0), K8X8XX_HT_CFG_BASE + 0xd, cldtfreq);
printk(BIOS_DEBUG, "\n");
/* no reset needed */
if ((width == awidth) && (afreq == cldtfreq)) {
return 0;
}
return 1;
}
int s3_save_nvram_early(u32 dword, int size, int nvram_pos)
{
printk(BIOS_DEBUG, "Writing %x of size %d to nvram pos: %d\n", dword, size, nvram_pos);
switch (size) {
case 1:
outb((dword & 0xff), K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=1;
break;
case 2:
outw((dword & 0xffff), K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=2;
break;
default:
outl(dword, K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=4;
break;
}
return nvram_pos;
}
int s3_load_nvram_early(int size, u32 *old_dword, int nvram_pos)
{
switch (size) {
case 1:
*old_dword &= ~0xff;
*old_dword |= inb(K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=1;
break;
case 2:
*old_dword &= ~0xffff;
*old_dword |= inw(K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=2;
break;
default:
*old_dword = inl(K8T890_NVRAM_IO_BASE+nvram_pos);
nvram_pos +=4;
break;
}
printk(BIOS_DEBUG, "Loading %x of size %d to nvram pos:%d\n", * old_dword, size, nvram_pos-size);
return nvram_pos;
}
uintptr_t restore_top_of_low_cacheable(void)
{
if (acpi_get_sleep_type() != 3)
return 0;
return inl(K8T890_NVRAM_IO_BASE+K8T890_NVRAM_TOP_OF_RAM);
}
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