134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Parse the EFI PCDP table to locate the console device.
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*
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* (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
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* Khalid Aziz <khalid.aziz@hp.com>
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* Alex Williamson <alex.williamson@hp.com>
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/acpi.h>
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#include <linux/console.h>
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#include <linux/efi.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <asm/vga.h>
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#include "pcdp.h"
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static int __init
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setup_serial_console(struct pcdp_uart *uart)
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{
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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int mmio;
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static char options[64], *p = options;
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char parity;
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mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
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p += sprintf(p, "uart8250,%s,0x%llx",
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mmio ? "mmio" : "io", uart->addr.address);
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if (uart->baud) {
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p += sprintf(p, ",%llu", uart->baud);
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if (uart->bits) {
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switch (uart->parity) {
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case 0x2: parity = 'e'; break;
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case 0x3: parity = 'o'; break;
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default: parity = 'n';
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}
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p += sprintf(p, "%c%d", parity, uart->bits);
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}
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}
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add_preferred_console("uart", 8250, &options[9]);
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return setup_earlycon(options);
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#else
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return -ENODEV;
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#endif
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}
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static int __init
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setup_vga_console(struct pcdp_device *dev)
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{
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#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
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u8 *if_ptr;
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if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
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if (if_ptr[0] == PCDP_IF_PCI) {
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struct pcdp_if_pci if_pci;
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/* struct copy since ifptr might not be correctly aligned */
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memcpy(&if_pci, if_ptr, sizeof(if_pci));
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if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
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vga_console_iobase = if_pci.ioport_tra;
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if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
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vga_console_membase = if_pci.mmio_tra;
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}
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if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
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printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
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return -ENODEV;
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}
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conswitchp = &vga_con;
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printk(KERN_INFO "PCDP: VGA console\n");
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return 0;
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#else
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return -ENODEV;
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#endif
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}
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int __init
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efi_setup_pcdp_console(char *cmdline)
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{
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struct pcdp *pcdp;
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struct pcdp_uart *uart;
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struct pcdp_device *dev, *end;
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int i, serial = 0;
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int rc = -ENODEV;
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if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
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return -ENODEV;
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pcdp = early_memremap(efi.hcdp, 4096);
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printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);
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if (strstr(cmdline, "console=hcdp")) {
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if (pcdp->rev < 3)
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serial = 1;
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} else if (strstr(cmdline, "console=")) {
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printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
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goto out;
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}
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if (pcdp->rev < 3 && efi_uart_console_only())
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serial = 1;
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for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
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if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
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if (uart->type == PCDP_CONSOLE_UART) {
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rc = setup_serial_console(uart);
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goto out;
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}
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}
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}
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end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
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for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
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dev < end;
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dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
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if (dev->flags & PCDP_PRIMARY_CONSOLE) {
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if (dev->type == PCDP_CONSOLE_VGA) {
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rc = setup_vga_console(dev);
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goto out;
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}
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}
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}
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out:
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early_memunmap(pcdp, 4096);
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return rc;
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}
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