diff options
Diffstat (limited to 'src/southbridge/intel')
| -rw-r--r-- | src/southbridge/intel/i82801gx/smbus.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82801gx/smbus.c b/src/southbridge/intel/i82801gx/smbus.c index f296b46fb3..c2e57b12d3 100644 --- a/src/southbridge/intel/i82801gx/smbus.c +++ b/src/southbridge/intel/i82801gx/smbus.c @@ -42,8 +42,191 @@ static int lsmbus_read_byte(device_t dev, u8 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 data) +{ + 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, data); +} + +static int do_smbus_block_write(unsigned smbus_base, unsigned device, + unsigned cmd, unsigned bytes, const u8 *buf) +{ + u8 status; + + 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(cmd & 0xff, smbus_base + SMBHSTCMD); + /* Set up for a block data write */ + outb((inb(smbus_base + SMBHSTCTL) & 0xe3) | (0x5 << 2), + (smbus_base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT); + + /* set number of bytes to transfer */ + outb(bytes, smbus_base + SMBHSTDAT0); + + outb(*buf++, smbus_base + SMBBLKDAT); + bytes--; + + /* Start the command */ + outb((inb(smbus_base + SMBHSTCTL) | 0x40), + smbus_base + SMBHSTCTL); + + while(!(inb(smbus_base + SMBHSTSTAT) & 1)); + /* Poll for transaction completion */ + do { + status = inb(smbus_base + SMBHSTSTAT); + if (status & ((1 << 4) | /* FAILED */ + (1 << 3) | /* BUS ERR */ + (1 << 2))) /* DEV ERR */ + return SMBUS_ERROR; + + if (status & 0x80) { /* Byte done */ + outb(*buf++, smbus_base + SMBBLKDAT); + outb(status, smbus_base + SMBHSTSTAT); + } + } while(status & 0x01); + + return 0; +} + + + +static int lsmbus_block_write(device_t dev, u8 cmd, u8 bytes, const u8 *buf) +{ + 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_block_write(res->base, device, cmd, bytes, buf); +} + +static int do_smbus_block_read(unsigned smbus_base, unsigned device, + unsigned cmd, unsigned bytes, u8 *buf) +{ + u8 status; + int bytes_read = 0; + 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) | 1, smbus_base + SMBXMITADD); + /* Set the command/address... */ + outb(cmd & 0xff, smbus_base + SMBHSTCMD); + /* Set up for a block data read */ + outb((inb(smbus_base + SMBHSTCTL) & 0xe3) | (0x5 << 2), + (smbus_base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(smbus_base + SMBHSTSTAT), smbus_base + SMBHSTSTAT); + + /* Start the command */ + outb((inb(smbus_base + SMBHSTCTL) | 0x40), + smbus_base + SMBHSTCTL); + + while(!(inb(smbus_base + SMBHSTSTAT) & 1)); + /* Poll for transaction completion */ + do { + status = inb(smbus_base + SMBHSTSTAT); + if (status & ((1 << 4) | /* FAILED */ + (1 << 3) | /* BUS ERR */ + (1 << 2))) /* DEV ERR */ + return SMBUS_ERROR; + + if (status & 0x80) { /* Byte done */ + *buf = inb(smbus_base + SMBBLKDAT); + buf++; + bytes_read++; + outb(status, smbus_base + SMBHSTSTAT); + if (--bytes == 1) { + /* indicate that next byte is the last one */ + outb(inb(smbus_base + SMBHSTCTL) | 0x20, + smbus_base + SMBHSTCTL); + } + } + } while(status & 0x01); + + return bytes_read; +} + +static int lsmbus_block_read(device_t dev, u8 cmd, u8 bytes, u8 *buf) +{ + 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_block_read(res->base, device, cmd, bytes, buf); +} + + static struct smbus_bus_operations lops_smbus_bus = { .read_byte = lsmbus_read_byte, + .write_byte = lsmbus_write_byte, + .block_read = lsmbus_block_read, + .block_write = lsmbus_block_write, }; static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device) |