136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/console.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serial_core.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%llx",
|
|
mmio ? "mmio" : "io", uart->addr.address);
|
|
if (uart->baud) {
|
|
p += sprintf(p, ",%llu", 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_earlycon(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
|
|
}
|
|
|
|
extern unsigned long hcdp_phys;
|
|
|
|
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 (hcdp_phys == EFI_INVALID_TABLE_ADDR)
|
|
return -ENODEV;
|
|
|
|
pcdp = early_memremap(hcdp_phys, 4096);
|
|
printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, hcdp_phys);
|
|
|
|
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:
|
|
early_memunmap(pcdp, 4096);
|
|
return rc;
|
|
}
|