diff options
Diffstat (limited to 'src/superio/nsc/pc97317/early_serial.c')
| -rw-r--r-- | src/superio/nsc/pc97317/early_serial.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/superio/nsc/pc97317/early_serial.c b/src/superio/nsc/pc97317/early_serial.c new file mode 100644 index 0000000000..00a92b3be6 --- /dev/null +++ b/src/superio/nsc/pc97317/early_serial.c @@ -0,0 +1,49 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2000 AG Electronics Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#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, u16 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); +} |