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bd82x6x: Add smbus_write_byte 

Change-Id: Iaab076cc014a1ee463866c243636f4f71798ddc4
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4838
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
This commit is contained in:
Vladimir Serbinenko 2014-01-27 23:48:27 +01:00 committed by Rudolf Marek
parent dec919890e
commit e57718f522
1 changed files with 57 additions and 0 deletions
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57
src/southbridge/intel/bd82x6x/smbus.c
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@ -58,8 +58,65 @@ static int lsmbus_read_byte(device_t dev, u8 address)
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)
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))
return SMBUS_ERROR;
return 0;
}
static int lsmbus_write_byte(device_t dev, u8 address, u8 val)
{
u16 device;
struct resource *res;
struct bus *pbus;
device = dev->path.i2c.device;
pbus = get_pbus_smbus(dev);
res = find_resource(pbus->dev, 0x20);
return do_smbus_write_byte(res->base, device, address, val);
}
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)