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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/firmware/pcdp.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/firmware/pcdp.c')
-rw-r--r-- | drivers/firmware/pcdp.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c new file mode 100644 index 0000000..6d5df6c --- /dev/null +++ b/drivers/firmware/pcdp.c @@ -0,0 +1,100 @@ +/* + * 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 "pcdp.h" + +static int __init +setup_serial_console(struct pcdp_uart *uart) +{ +#ifdef CONFIG_SERIAL_8250_CONSOLE + int mmio; + static char options[64]; + + mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); + snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d", + mmio ? "mmio" : "io", uart->addr.address, uart->baud, + uart->bits ? uart->bits : 8); + + return early_serial_console_init(options); +#else + return -ENODEV; +#endif +} + +static int __init +setup_vga_console(struct pcdp_vga *vga) +{ +#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) + if (efi_mem_type(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; + + pcdp = efi.hcdp; + if (!pcdp) + return -ENODEV; + + printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); + + if (strstr(cmdline, "console=hcdp")) { + if (pcdp->rev < 3) + serial = 1; + } else if (strstr(cmdline, "console=")) { + printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); + return -ENODEV; + } + + 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) { + return setup_serial_console(uart); + } + } + } + + 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) { + return setup_vga_console((struct pcdp_vga *) dev); + } + } + } + + return -ENODEV; +} |