diff options
Diffstat (limited to 'src/superio/ite/it8671f')
| -rw-r--r-- | src/superio/ite/it8671f/it8671f_early_serial.c | 54 |
1 files changed, 34 insertions, 20 deletions
diff --git a/src/superio/ite/it8671f/it8671f_early_serial.c b/src/superio/ite/it8671f/it8671f_early_serial.c index 56d1d8c2dd..849235f1ce 100644 --- a/src/superio/ite/it8671f/it8671f_early_serial.c +++ b/src/superio/ite/it8671f/it8671f_early_serial.c @@ -24,7 +24,7 @@ /* The base address is 0x3f0, 0x3bd, or 0x370, depending on config bytes. */ #define SIO_BASE 0x3f0 #define SIO_INDEX SIO_BASE -#define SIO_DATA SIO_BASE+1 +#define SIO_DATA (SIO_BASE + 1) /* Global configuration registers. */ #define IT8671F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */ @@ -34,8 +34,10 @@ #define IT8671F_CONFIGURATION_PORT 0x0279 /* Write-only. */ -/* Special values used for entering MB PnP mode. The first four bytes of - each line determine the address port, the last four are data. */ +/* + * Special values used for entering MB PnP mode. The first four bytes of + * each line determine the address port, the last four are data. + */ static const uint8_t init_values[] = { 0x6a, 0xb5, 0xda, 0xed, /**/ 0xf6, 0xfb, 0x7d, 0xbe, 0xdf, 0x6f, 0x37, 0x1b, /**/ 0x0d, 0x86, 0xc3, 0x61, @@ -43,8 +45,10 @@ static const uint8_t init_values[] = { 0xe8, 0x74, 0x3a, 0x9d, /**/ 0xce, 0xe7, 0x73, 0x39, }; -/* The content of IT8671F_CONFIG_REG_LDN (index 0x07) must be set to the - LDN the register belongs to, before you can access the register. */ +/* + * The content of IT8671F_CONFIG_REG_LDN (index 0x07) must be set to the + * LDN the register belongs to, before you can access the register. + */ static void it8671f_sio_write(uint8_t ldn, uint8_t index, uint8_t value) { outb(IT8671F_CONFIG_REG_LDN, SIO_BASE); @@ -53,13 +57,11 @@ static void it8671f_sio_write(uint8_t ldn, uint8_t index, uint8_t value) outb(value, SIO_DATA); } -/* Enable the peripheral devices on the IT8671F Super I/O chip. */ -static void it8671f_enable_serial(device_t dev, unsigned iobase) +/* Enter the configuration state (MB PnP mode). */ +static void it8671f_enter_conf(void) { uint8_t i; - /* (1) Enter the configuration state (MB PnP mode). */ - /* Perform MB PnP setup to put the SIO chip at 0x3f0. */ /* Base address 0x3f0: 0x86 0x80 0x55 0x55. */ /* Base address 0x3bd: 0x86 0x80 0x55 0xaa. */ @@ -70,24 +72,36 @@ static void it8671f_enable_serial(device_t dev, unsigned iobase) outb(0x55, IT8671F_CONFIGURATION_PORT); /* Sequentially write the 32 special values. */ - for (i = 0; i < 32; i++) { + for (i = 0; i < 32; i++) outb(init_values[i], SIO_BASE); - } +} + +/* Exit the configuration state (MB PnP mode). */ +static void it8671f_exit_conf(void) +{ + it8671f_sio_write(0x00, IT8671F_CONFIG_REG_CC, 0x02); +} - /* (2) Modify the data of configuration registers. */ +/* Select 48MHz CLKIN (24MHz is the default). */ +void it8671f_48mhz_clkin(void) +{ + it8671f_enter_conf(); + it8671f_sio_write(0x00, IT8671F_CONFIG_REG_SWSUSP, (1 << 6)); + it8671f_exit_conf(); +} + +/* Enable the serial ports on the IT8671F Super I/O chip. */ +static void it8671f_enable_serial(device_t dev, unsigned iobase) +{ + it8671f_enter_conf(); /* Allow all devices to be enabled. Bits: FDC (0), Com1 (1), Com2 (2), PP (3), Reserved (4), KBCK (5), KBCM (6), Reserved (7). */ it8671f_sio_write(0x00, IT8671F_CONFIG_REG_LDE, 0x6f); /* Enable serial port(s). */ - it8671f_sio_write(IT8671F_SP1, 0x30, 0x01); /* Serial port 1 */ - it8671f_sio_write(IT8671F_SP2, 0x30, 0x01); /* Serial port 2 */ + it8671f_sio_write(IT8671F_SP1, 0x30, 0x01); /* Serial port 1 */ + it8671f_sio_write(IT8671F_SP2, 0x30, 0x01); /* Serial port 2 */ - /* Select 24MHz CLKIN (clear bit 6) and clear software suspend - mode (clear bit 0). */ - it8671f_sio_write(0x00, IT8671F_CONFIG_REG_SWSUSP, 0x00); - - /* (3) Exit the configuration state (MB PnP mode). */ - it8671f_sio_write(0x00, IT8671F_CONFIG_REG_CC, 0x02); + it8671f_exit_conf(); } |