diff options
Diffstat (limited to 'src/superio/nsc/pc97317/pc97317_early_serial.c')
| -rw-r--r-- | src/superio/nsc/pc97317/pc97317_early_serial.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/superio/nsc/pc97317/pc97317_early_serial.c b/src/superio/nsc/pc97317/pc97317_early_serial.c new file mode 100644 index 0000000000..3aa7f99890 --- /dev/null +++ b/src/superio/nsc/pc97317/pc97317_early_serial.c @@ -0,0 +1,33 @@ +#include <arch/romcc_io.h> +#include "pc97317.h" + +#define PM_DEV PNP_DEV(0x2e, PC97317_PM) +#define PM_BASE 0xe8 + +/* The pc97317 needs clocks to be set up before the serial port will operate */ + +static void pc97317_enable_serial(device_t dev, unsigned iobase) +{ + /* Set base address of power management unit */ + + pnp_set_logical_device(PM_DEV); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, PM_BASE); + pnp_set_enable(dev, 1); + + /* Use on-chip clock multiplier */ + + outb(0x03, PM_BASE); + outb(inb(PM_BASE + 1) | 0x07, PM_BASE + 1); + + /* Wait for the clock to stabilise */ + while(!inb(PM_BASE + 1 & 0x80)) + ; + + /* Set the base address of the port */ + + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); +} |