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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2009 coresystems GmbH
*
* 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.
*/
// other bioses use this, too:
#define SMBUS_IO_BASE 0x0500
#define SMBHSTSTAT SMBUS_IO_BASE + 0x0
#define SMBSLVSTAT SMBUS_IO_BASE + 0x1
#define SMBHSTCTL SMBUS_IO_BASE + 0x2
#define SMBHSTCMD SMBUS_IO_BASE + 0x3
#define SMBXMITADD SMBUS_IO_BASE + 0x4
#define SMBHSTDAT0 SMBUS_IO_BASE + 0x5
#define SMBHSTDAT1 SMBUS_IO_BASE + 0x6
#define SMBBLKDAT SMBUS_IO_BASE + 0x7
#define SMBSLVCTL SMBUS_IO_BASE + 0x8
#define SMBTRNSADD SMBUS_IO_BASE + 0x9
#define SMBSLVDATA SMBUS_IO_BASE + 0xa
#define SMLINK_PIN_CTL SMBUS_IO_BASE + 0xe
#define SMBUS_PIN_CTL SMBUS_IO_BASE + 0xf
/* Define register settings */
#define HOST_RESET 0xff
#define READ_CMD 0x01 // 1 in the 0 bit of SMBHSTADD states to READ
#define SMBUS_TIMEOUT (100*1000*10)
#define I2C_TRANS_CMD 0x40
#define CLOCK_SLAVE_ADDRESS 0x69
#define SMBUS_DELAY() outb(0x80, 0x80)
/* Internal functions */
#if CONFIG_DEBUG_SMBUS
static void smbus_print_error(unsigned char host_status_register, int loops)
{
/* Check if there actually was an error */
if (host_status_register == 0x00 || host_status_register == 0x40 ||
host_status_register == 0x42)
return;
printk(BIOS_ERR, "SMBus Error: %02x\n", host_status_register);
if (loops >= SMBUS_TIMEOUT) {
printk(BIOS_ERR, "SMBus Timout\n");
}
if (host_status_register & (1 << 4)) {
printk(BIOS_ERR, "Interrup/SMI# was Failed Bus Transaction\n");
}
if (host_status_register & (1 << 3)) {
printk(BIOS_ERR, "Bus Error\n");
}
if (host_status_register & (1 << 2)) {
printk(BIOS_ERR, "Device Error\n");
}
if (host_status_register & (1 << 1)) {
/* This isn't a real error... */
printk(BIOS_DEBUG, "Interrupt/SMI# was Successful Completion\n");
}
if (host_status_register & (1 << 0)) {
printk(BIOS_ERR, "Host Busy\n");
}
}
#endif
static void smbus_wait_until_ready(void)
{
int loops;
loops = 0;
/* Yes, this is a mess, but it's the easiest way to do it */
while (((inb(SMBHSTSTAT) & 1) == 1) && (loops <= SMBUS_TIMEOUT)) {
SMBUS_DELAY();
++loops;
}
#if CONFIG_DEBUG_SMBUS
/* Some systems seem to have a flakey SMBus. No need to spew a lot of
* errors on those, once we know that SMBus access is principally
* working.
*/
smbus_print_error(inb(SMBHSTSTAT), loops);
#endif
}
static void smbus_reset(void)
{
outb(HOST_RESET, SMBHSTSTAT);
}
/* Public functions */
static void set_ics_data(unsigned char dev, int data, char len)
{
smbus_reset();
/* clear host data port */
outb(0x00, SMBHSTDAT0);
SMBUS_DELAY();
smbus_wait_until_ready();
/* read to reset block transfer counter */
inb(SMBHSTCTL);
/* fill blocktransfer array */
if (dev == 0xd2) {
outb(0x0d, SMBBLKDAT);
outb(0x00, SMBBLKDAT);
outb(0x3f, SMBBLKDAT);
outb(0xcd, SMBBLKDAT);
outb(0x7f, SMBBLKDAT);
outb(0xbf, SMBBLKDAT);
outb(0x1a, SMBBLKDAT);
outb(0x2a, SMBBLKDAT);
outb(0x01, SMBBLKDAT);
outb(0x0f, SMBBLKDAT);
outb(0x0b, SMBBLKDAT);
outb(0x80, SMBBLKDAT);
outb(0x8d, SMBBLKDAT);
outb(0x9b, SMBBLKDAT);
} else {
outb(0x08, SMBBLKDAT);
outb(0xff, SMBBLKDAT);
outb(0x3f, SMBBLKDAT);
outb(0x00, SMBBLKDAT);
outb(0x00, SMBBLKDAT);
outb(0xff, SMBBLKDAT);
outb(0xff, SMBBLKDAT);
outb(0xff, SMBBLKDAT);
outb(0xff, SMBBLKDAT);
}
outb(dev, SMBXMITADD);
outb(0, SMBHSTCMD);
outb(len, SMBHSTDAT0);
outb(0x74, SMBHSTCTL);
SMBUS_DELAY();
smbus_wait_until_ready();
smbus_reset();
}
static unsigned int get_spd_data(const struct mem_controller *ctrl, unsigned int dimm,
unsigned int offset)
{
unsigned int val, addr;
smbus_reset();
/* clear host data port */
outb(0x00, SMBHSTDAT0);
SMBUS_DELAY();
smbus_wait_until_ready();
/* Fetch the SMBus address of the SPD ROM from
* the ctrl struct in romstage.c in case they are at
* non-standard positions.
* SMBus Address shifted by 1
*/
addr = (ctrl->channel0[dimm]) << 1;
outb(addr | 0x1, SMBXMITADD);
outb(offset, SMBHSTCMD);
outb(0x48, SMBHSTCTL);
SMBUS_DELAY();
smbus_wait_until_ready();
val = inb(SMBHSTDAT0);
smbus_reset();
return val;
}
static void enable_smbus(void)
{
pci_devfn_t dev;
/* The CX700 ISA Bridge (0x1106, 0x8324) is hardcoded to this location,
* no need to probe.
*/
dev = PCI_DEV(0, 17, 0);
/* SMBus Clock Select: Divider fof 14.318MHz */
pci_write_config8(dev, 0x94, 0x20);
/* SMBus I/O Base, enable SMBus */
pci_write_config16(dev, 0xd0, SMBUS_IO_BASE | 1);
/* SMBus Clock from 128K Source, Enable SMBus Host Controller */
pci_write_config8(dev, 0xd2, 0x05);
/* Enable I/O decoding */
pci_write_config16(dev, 0x04, 0x0003);
/* Setup clock chips */
set_ics_data(0xd2, 0, 14);
set_ics_data(0xd4, 0, 9);
}
/* Debugging Function */
#if CONFIG_DEBUG_SMBUS
static void dump_spd_data(const struct mem_controller *ctrl)
{
int dimm, offset, regs;
unsigned int val;
for (dimm = 0; dimm < DIMM_SOCKETS; dimm++) {
printk(BIOS_DEBUG, "SPD Data for DIMM %02x\n", dimm);
val = get_spd_data(ctrl, dimm, 0);
if (val == 0xff) {
regs = 256;
} else if (val == 0x80) {
regs = 128;
} else {
printk(BIOS_DEBUG, "No DIMM present\n");
regs = 0;
}
for (offset = 0; offset < regs; offset++) {
printk(BIOS_DEBUG, " Offset %02x = 0x%02x\n",
offset, get_spd_data(ctrl, dimm, offset));
}
}
}
#else
#define dump_spd_data(ctrl)
#endif
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