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pcdp.c

/*
 * Parse the EFI PCDP table to locate the console device.
 *
 * (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
 *    Khalid Aziz <khalid.aziz@hp.com>
 *    Alex Williamson <alex.williamson@hp.com>
 *    Bjorn Helgaas <bjorn.helgaas@hp.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/acpi.h>
#include <linux/console.h>
#include <linux/efi.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <asm/vga.h>
#include "pcdp.h"

static int __init
setup_serial_console(struct pcdp_uart *uart)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
      int mmio;
      static char options[64], *p = options;
      char parity;

      mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
      p += sprintf(p, "uart8250,%s,0x%lx",
            mmio ? "mmio" : "io", uart->addr.address);
      if (uart->baud) {
            p += sprintf(p, ",%lu", uart->baud);
            if (uart->bits) {
                  switch (uart->parity) {
                      case 0x2: parity = 'e'; break;
                      case 0x3: parity = 'o'; break;
                      default:  parity = 'n';
                  }
                  p += sprintf(p, "%c%d", parity, uart->bits);
            }
      }

      add_preferred_console("uart", 8250, &options[9]);
      return setup_early_serial8250_console(options);
#else
      return -ENODEV;
#endif
}

static int __init
setup_vga_console(struct pcdp_device *dev)
{
#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
      u8 *if_ptr;

      if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
      if (if_ptr[0] == PCDP_IF_PCI) {
            struct pcdp_if_pci if_pci;

            /* struct copy since ifptr might not be correctly aligned */

            memcpy(&if_pci, if_ptr, sizeof(if_pci));

            if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
                  vga_console_iobase = if_pci.ioport_tra;

            if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
                  vga_console_membase = if_pci.mmio_tra;
      }

      if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
            printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
            return -ENODEV;
      }

      conswitchp = &vga_con;
      printk(KERN_INFO "PCDP: VGA console\n");
      return 0;
#else
      return -ENODEV;
#endif
}

int __init
efi_setup_pcdp_console(char *cmdline)
{
      struct pcdp *pcdp;
      struct pcdp_uart *uart;
      struct pcdp_device *dev, *end;
      int i, serial = 0;
      int rc = -ENODEV;

      if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
            return -ENODEV;

      pcdp = ioremap(efi.hcdp, 4096);
      printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);

      if (strstr(cmdline, "console=hcdp")) {
            if (pcdp->rev < 3)
                  serial = 1;
      } else if (strstr(cmdline, "console=")) {
            printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
            goto out;
      }

      if (pcdp->rev < 3 && efi_uart_console_only())
            serial = 1;

      for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
            if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
                  if (uart->type == PCDP_CONSOLE_UART) {
                        rc = setup_serial_console(uart);
                        goto out;
                  }
            }
      }

      end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
      for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
           dev < end;
           dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
            if (dev->flags & PCDP_PRIMARY_CONSOLE) {
                  if (dev->type == PCDP_CONSOLE_VGA) {
                        rc = setup_vga_console(dev);
                        goto out;
                  }
            }
      }

out:
      iounmap(pcdp);
      return rc;
}

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