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lynxpoint: Add LPT-LP device id and smbus_write_byte 

This is needed for SMBUS drivers to write to devices.
It was copied from existing intel southbridge driver.

Change-Id: Id0ce2393b2946a9c741413bca563a1a4dc0a4f5e
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/61893
Reviewed-on: http://review.coreboot.org/4364
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
Duncan Laurie 2013-07-15 09:07:20 -07:00 committed by Patrick Georgi
parent 05d065cff5
commit 8870733b59
1 changed files with 63 additions and 2 deletions
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65
src/southbridge/intel/lynxpoint/smbus.c
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@ -53,13 +53,74 @@ static int lsmbus_read_byte(device_t dev, u8 address)
device = dev->path.i2c.device; device = dev->path.i2c.device;
pbus = get_pbus_smbus(dev); pbus = get_pbus_smbus(dev);
res = find_resource(pbus->dev, 0x20); res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
return do_smbus_read_byte(res->base, device, address); return do_smbus_read_byte(res->base, device, address);
} }
static int do_smbus_write_byte(unsigned smbus_base, unsigned device,
unsigned address, unsigned data)
{
unsigned char global_status_register;
if (smbus_wait_until_ready(smbus_base) < 0)
return SMBUS_WAIT_UNTIL_READY_TIMEOUT;
/* Setup transaction */
/* Disable interrupts */
outb(inb(smbus_base + SMBHSTCTL) & (~1), smbus_base + SMBHSTCTL);
/* Set the device I'm talking too */
outb(((device & 0x7f) << 1) & ~0x01, smbus_base + SMBXMITADD);
/* Set the command/address... */
outb(address & 0xff, smbus_base + SMBHSTCMD);
/* Set up for a byte data read */
outb((inb(smbus_base + SMBHSTCTL) & 0xe3) | (0x2 << 2),
(smbus_base + SMBHSTCTL));
/* Clear any lingering errors, so the transaction will run */
outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT);
/* Clear the data byte... */
outb(data, smbus_base + SMBHSTDAT0);
/* Start the command */
outb((inb(smbus_base + SMBHSTCTL) | 0x40),
smbus_base + SMBHSTCTL);
/* Poll for transaction completion */
if (smbus_wait_until_done(smbus_base) < 0) {
printk(BIOS_ERR, "SMBUS transaction timeout\n");
return SMBUS_WAIT_UNTIL_DONE_TIMEOUT;
}
global_status_register = inb(smbus_base + SMBHSTSTAT);
/* Ignore the "In Use" status... */
global_status_register &= ~(3 << 5);
/* Read results of transaction */
if (global_status_register != (1 << 1)) {
printk(BIOS_ERR, "SMBUS transaction error\n");
return SMBUS_ERROR;
}
return 0;
}
static int lsmbus_write_byte(device_t dev, u8 address, u8 data)
{
u16 device;
struct resource *res;
struct bus *pbus;
device = dev->path.i2c.device;
pbus = get_pbus_smbus(dev);
res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
return do_smbus_write_byte(res->base, device, address, data);
}
static struct smbus_bus_operations lops_smbus_bus = { static struct smbus_bus_operations lops_smbus_bus = {
.read_byte = lsmbus_read_byte, .read_byte = lsmbus_read_byte,
.write_byte = lsmbus_write_byte,
}; };
static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device) static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device)
@ -100,7 +161,7 @@ static struct device_operations smbus_ops = {
.ops_pci = &smbus_pci_ops, .ops_pci = &smbus_pci_ops,
}; };
static const unsigned short pci_device_ids[] = { 0x1c22, 0x1e22, 0 }; static const unsigned short pci_device_ids[] = { 0x1c22, 0x1e22, 0x9c22, 0 };
static const struct pci_driver pch_smbus __pci_driver = { static const struct pci_driver pch_smbus __pci_driver = {
.ops = &smbus_ops, .ops = &smbus_ops,