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drivers/firmware/pcdp.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * 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> |
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*/ #include <linux/acpi.h> #include <linux/console.h> #include <linux/efi.h> #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" static int __init setup_serial_console(struct pcdp_uart *uart) { #ifdef CONFIG_SERIAL_8250_CONSOLE 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) { switch (uart->parity) { case 0x2: parity = 'e'; break; case 0x3: parity = 'o'; break; default: parity = 'n'; } p += sprintf(p, "%c%d", parity, uart->bits); } } |
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add_preferred_console("uart", 8250, &options[9]); |
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return setup_earlycon(options); |
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#else return -ENODEV; #endif } static int __init |
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setup_vga_console(struct pcdp_device *dev) |
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{ #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) |
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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) { |
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printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO! "); return -ENODEV; } conswitchp = &vga_con; printk(KERN_INFO "PCDP: VGA console "); 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; |
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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 ", pcdp->rev, efi.hcdp); |
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if (strstr(cmdline, "console=hcdp")) { if (pcdp->rev < 3) serial = 1; } else if (strstr(cmdline, "console=")) { printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP "); |
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goto out; |
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} 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) { |
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rc = setup_serial_console(uart); goto out; |
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} } } 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) { |
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rc = setup_vga_console(dev); goto out; |
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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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} |