diff options
Diffstat (limited to 'src/southbridge')
| -rw-r--r-- | src/southbridge/amd/cs5536/cs5536_smbus2.h | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/src/southbridge/amd/cs5536/cs5536_smbus2.h b/src/southbridge/amd/cs5536/cs5536_smbus2.h new file mode 100644 index 0000000000..3f5dad002e --- /dev/null +++ b/src/southbridge/amd/cs5536/cs5536_smbus2.h @@ -0,0 +1,299 @@ +//#include <device/smbus_def.h> +#define SMBUS_ERROR -1 +#define SMBUS_WAIT_UNTIL_READY_TIMEOUT -2 +#define SMBUS_WAIT_UNTIL_DONE_TIMEOUT -3 + +#define SMB_SDA 0x00 +#define SMB_STS 0x01 +#define SMB_CTRL_STS 0x02 +#define SMB_CTRL1 0x03 +#define SMB_ADD 0x04 +#define SMB_CTRL2 0x05 +#define SMB_CTRL3 0x06 + +#define SMB_STS_SLVSTP (0x01 << 7) +#define SMB_STS_SDAST (0x01 << 6) +#define SMB_STS_BER (0x01 << 5) +#define SMB_STS_NEGACK (0x01 << 4) +#define SMB_STS_STASTR (0x01 << 3) +#define SMB_STS_NMATCH (0x01 << 2) +#define SMB_STS_MASTER (0x01 << 1) +#define SMB_STS_XMIT (0x01 << 0) + +#define SMB_CSTS_TGSCL (0x01 << 5) +#define SMB_CSTS_TSDA (0x01 << 4) +#define SMB_CSTS_GCMTCH (0x01 << 3) +#define SMB_CSTS_MATCH (0x01 << 2) +#define SMB_CSTS_BB (0x01 << 1) +#define SMB_CSTS_BUSY (0x01 << 0) + +#define SMB_CTRL1_STASTRE (0x01 << 7) +#define SMB_CTRL1_NMINTE (0x01 << 6) +#define SMB_CTRL1_GCMEN (0x01 << 5) +#define SMB_CTRL1_ACK (0x01 << 4) +#define SMB_CTRL1_RSVD (0x01 << 3) +#define SMB_CTRL1_INTEN (0x01 << 2) +#define SMB_CTRL1_STOP (0x01 << 1) +#define SMB_CTRL1_START (0x01 << 0) + +#define SMB_ADD_SAEN (0x01 << 7) + +#define SMB_CTRL2_ENABLE 0x01 + +#define SMBUS_TIMEOUT (100*1000*10) +#define SMBUS_STATUS_MASK 0xfbff + +#define SMBUS_IO_BASE 0x6000 + +static void smbus_delay(void) +{ + outb(0x80, 0x80); +} + +static int smbus_wait(unsigned smbus_io_base) { + unsigned long loops = SMBUS_TIMEOUT; + unsigned char val; + + do { + smbus_delay(); + val = inb(smbus_io_base + SMB_STS); + if ((val & SMB_STS_SDAST) != 0) + break; + if (val & (SMB_STS_BER | SMB_STS_NEGACK)) { + printk_debug("SMBUS WAIT ERROR %x\n", val); + return SMBUS_ERROR; + } + } while(--loops); + + outb(0, smbus_io_base + SMB_STS); + return loops ? 0 : SMBUS_WAIT_UNTIL_READY_TIMEOUT; +} + +static int smbus_write(unsigned smbus_io_base, unsigned char byte) { + + outb(byte, smbus_io_base + SMB_SDA); + return smbus_wait(smbus_io_base); +} + +/* generate a smbus start condition */ +static int smbus_start_condition(unsigned smbus_io_base) +{ + unsigned char val; + + /* issue a START condition */ + val = inb(smbus_io_base + SMB_CTRL1); + outb(val | SMB_CTRL1_START, smbus_io_base + SMB_CTRL1); + + /* check for bus conflict */ + val = inb(smbus_io_base + SMB_STS); + if ((val & SMB_STS_BER) != 0) + return SMBUS_ERROR; + + return smbus_wait(smbus_io_base); +} + +static int smbus_check_stop_condition(unsigned smbus_io_base) +{ + unsigned char val; + unsigned long loops; + loops = SMBUS_TIMEOUT; + /* check for SDA status */ + do { + smbus_delay(); + val = inb(smbus_io_base + SMB_CTRL1); + if ((val & SMB_CTRL1_STOP) == 0) { + break; + } + } while(--loops); + return loops?0:SMBUS_WAIT_UNTIL_READY_TIMEOUT; + + /* Make sure everything is cleared and ready to go */ + + val = inb(smbus_io_base + SMB_CTRL1); + outb(val & ~(SMB_CTRL1_STASTRE | SMB_CTRL1_NMINTE), + smbus_io_base + SMB_CTRL1); + + outb(SMB_STS_BER | SMB_STS_NEGACK | SMB_STS_STASTR, + smbus_io_base + SMB_STS); + + val = inb(smbus_io_base + SMB_CTRL_STS); + outb(val | SMB_CSTS_BB, smbus_io_base + SMB_CTRL_STS); +} + +static int smbus_stop_condition(unsigned smbus_io_base) +{ + unsigned char val; + val = inb(smbus_io_base + SMB_CTRL1); + outb(SMB_CTRL1_STOP, smbus_io_base + SMB_CTRL1); + + return 0; +} + +static int smbus_ack(unsigned smbus_io_base, int state) +{ + unsigned char val = inb(smbus_io_base + SMB_CTRL1); + + if (state) + outb(val | SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1); + else + outb(val & ~SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1); + + return 0; +} + +static int smbus_send_slave_address(unsigned smbus_io_base, unsigned char device) +{ + unsigned char val; + + /* send the slave address */ + outb(device, smbus_io_base + SMB_SDA); + + /* check for bus conflict and NACK */ + val = inb(smbus_io_base + SMB_STS); + if (((val & SMB_STS_BER) != 0) || + ((val & SMB_STS_NEGACK) != 0)) { + printk_debug("SEND SLAVE ERROR (%x)\n", val); + return SMBUS_ERROR; + } + return smbus_wait(smbus_io_base); +} + +static int smbus_send_command(unsigned smbus_io_base, unsigned char command) +{ + unsigned char val; + + /* send the command */ + outb(command, smbus_io_base + SMB_SDA); + + /* check for bus conflict and NACK */ + val = inb(smbus_io_base + SMB_STS); + if (((val & SMB_STS_BER) != 0) || + ((val & SMB_STS_NEGACK) != 0)) + return SMBUS_ERROR; + + return smbus_wait(smbus_io_base); +} + +static void _doread(unsigned smbus_io_base, unsigned char device, + unsigned char address, unsigned char *data, int count) +{ + int ret; + int index = 0; + unsigned char val; + + if ((ret = smbus_check_stop_condition(smbus_io_base))) + goto err; + + index++; + + if ((ret = smbus_start_condition(smbus_io_base))) + goto err; + + index++; /* 2 */ + if ((ret = smbus_send_slave_address(smbus_io_base, device))) + goto err; + + index++; + if ((ret = smbus_send_command(smbus_io_base, address))) + goto err; + + index++; + if ((ret = smbus_start_condition(smbus_io_base))) + goto err; + + /* Clear the ack for multiple byte reads */ + smbus_ack(smbus_io_base, (count == 1) ? 1 : 0); + + index++; + if ((ret = smbus_send_slave_address(smbus_io_base, device | 0x01))) + goto err; + + while(count) { + /* Set the ACK if this is the next to last byte */ + smbus_ack(smbus_io_base, (count == 2) ? 1 : 0); + + /* Set the stop bit if this is the last byte to read */ + + if (count == 1) + smbus_stop_condition(smbus_io_base); + + val = inb(smbus_io_base + SMB_SDA); + *data++ = val; + + if (count > 1) { + int ret = smbus_wait(smbus_io_base); + if (ret) + return ret; + } + + count--; + } + + return; + + err: + printk_debug("SMBUS READ ERROR (%d): %d\n", index, ret); +} + +static unsigned char do_smbus_read_byte(unsigned smbus_io_base, + unsigned char device, + unsigned char address) +{ + unsigned char val = 0; + _doread(smbus_io_base, device, address, &val, sizeof(val)); + return val; +} + +static unsigned short do_smbus_read_word(unsigned smbus_io_base, + unsigned char device, unsigned char address) +{ + unsigned short val = 0; + _doread(smbus_io_base, device, address, (unsigned char *) &val, + sizeof(val)); + return val; +} + +static int _dowrite(unsigned smbus_io_base, unsigned char device, + unsigned char address, unsigned char *data, int count) { + + int ret; + + if ((ret = smbus_check_stop_condition(smbus_io_base))) + goto err; + + if ((ret = smbus_start_condition(smbus_io_base))) + goto err; + + if ((ret = smbus_send_slave_address(smbus_io_base, device))) + goto err; + + if ((ret = smbus_send_command(smbus_io_base, address))) + goto err; + + while(count) { + if ((ret = smbus_write(smbus_io_base, *data++))) + goto err; + count--; + } + + smbus_stop_condition(smbus_io_base); + return 0; + + err: + printk_debug("SMBUS WRITE ERROR: %d\n", ret); + return -1; +} + + +static int do_smbus_write_byte(unsigned smbus_io_base, unsigned char device, + unsigned char address, unsigned char data) +{ + return _dowrite(smbus_io_base, device, address, + (unsigned char *) &data, 1); +} + +static int do_smbus_write_word(unsigned smbus_io_base, unsigned char device, unsigned char address, + unsigned short data) +{ + return _dowrite(smbus_io_base, device ,address, (unsigned char *) &data, 2); +} |