[mirror_ubuntu-hirsute-kernel.git] / drivers / firmware / pcdp.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
}

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 = early_memremap(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:
	early_memunmap(pcdp, 4096);
	return rc;
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* Parse the EFI PCDP table to locate the console device.
	4	*
	5	* (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
	6	* Khalid Aziz <khalid.aziz@hp.com>
	7	* Alex Williamson <alex.williamson@hp.com>
	8	* Bjorn Helgaas <bjorn.helgaas@hp.com>
1da177e4 LT	9	*/
	10
	11	#include <linux/acpi.h>
	12	#include <linux/console.h>
	13	#include <linux/efi.h>
	14	#include <linux/serial.h>
df519e7b	15	#include <linux/serial_core.h>
66b7f8a3	16	#include <asm/vga.h>
1da177e4 LT	17	#include "pcdp.h"
	18
	19	static int __init
	20	setup_serial_console(struct pcdp_uart *uart)
	21	{
	22	#ifdef CONFIG_SERIAL_8250_CONSOLE
	23	int mmio;
280dedb8	24	static char options[64], *p = options;
11be00cb	25	char parity;
1da177e4	26
15a58ed1	27	mmio = (uart->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
e088a4ad	28	p += sprintf(p, "uart8250,%s,0x%llx",
280dedb8	29	mmio ? "mmio" : "io", uart->addr.address);
11be00cb	30	if (uart->baud) {
e088a4ad	31	p += sprintf(p, ",%llu", uart->baud);
11be00cb BH	32	if (uart->bits) {
	33	switch (uart->parity) {
	34	case 0x2: parity = 'e'; break;
	35	case 0x3: parity = 'o'; break;
	36	default: parity = 'n';
	37	}
	38	p += sprintf(p, "%c%d", parity, uart->bits);
	39	}
	40	}
1da177e4	41
18a8bd94	42	add_preferred_console("uart", 8250, &options[9]);
df519e7b	43	return setup_earlycon(options);
1da177e4 LT	44	#else
	45	return -ENODEV;
	46	#endif
	47	}
	48
	49	static int __init
66b7f8a3	50	setup_vga_console(struct pcdp_device *dev)
1da177e4 LT	51	{
1da177e4 LT	52	#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
66b7f8a3 MM	53	u8 *if_ptr;
	54
	55	if_ptr = ((u8 *)dev + sizeof(struct pcdp_device));
	56	if (if_ptr[0] == PCDP_IF_PCI) {
	57	struct pcdp_if_pci if_pci;
	58
	59	/* struct copy since ifptr might not be correctly aligned */
	60
	61	memcpy(&if_pci, if_ptr, sizeof(if_pci));
	62
	63	if (if_pci.trans & PCDP_PCI_TRANS_IOPORT)
	64	vga_console_iobase = if_pci.ioport_tra;
	65
	66	if (if_pci.trans & PCDP_PCI_TRANS_MMIO)
	67	vga_console_membase = if_pci.mmio_tra;
	68	}
	69
	70	if (efi_mem_type(vga_console_membase + 0xA0000) == EFI_CONVENTIONAL_MEMORY) {
1da177e4 LT	71	printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
	72	return -ENODEV;
	73	}
	74
	75	conswitchp = &vga_con;
	76	printk(KERN_INFO "PCDP: VGA console\n");
	77	return 0;
	78	#else
	79	return -ENODEV;
	80	#endif
	81	}
	82
	83	int __init
	84	efi_setup_pcdp_console(char *cmdline)
	85	{
	86	struct pcdp *pcdp;
	87	struct pcdp_uart *uart;
	88	struct pcdp_device dev, end;
	89	int i, serial = 0;
b2c99e3c	90	int rc = -ENODEV;
1da177e4	91
b2c99e3c	92	if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
1da177e4 LT	93	return -ENODEV;
1da177e4 LT	94
f7750a79	95	pcdp = early_memremap(efi.hcdp, 4096);
b2c99e3c	96	printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);
1da177e4 LT	97
	98	if (strstr(cmdline, "console=hcdp")) {
	99	if (pcdp->rev < 3)
	100	serial = 1;
	101	} else if (strstr(cmdline, "console=")) {
	102	printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
b2c99e3c	103	goto out;
1da177e4 LT	104	}
	105
	106	if (pcdp->rev < 3 && efi_uart_console_only())
	107	serial = 1;
	108
	109	for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
	110	if (uart->flags & PCDP_UART_PRIMARY_CONSOLE \|\| serial) {
	111	if (uart->type == PCDP_CONSOLE_UART) {
b2c99e3c BH	112	rc = setup_serial_console(uart);
b2c99e3c BH	113	goto out;
1da177e4 LT	114	}
	115	}
	116	}
	117
	118	end = (struct pcdp_device ) ((u8 ) pcdp + pcdp->length);
	119	for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
	120	dev < end;
	121	dev = (struct pcdp_device ) ((u8 ) dev + dev->length)) {
	122	if (dev->flags & PCDP_PRIMARY_CONSOLE) {
	123	if (dev->type == PCDP_CONSOLE_VGA) {
b2c99e3c BH	124	rc = setup_vga_console(dev);
b2c99e3c BH	125	goto out;
1da177e4 LT	126	}
	127	}
	128	}
	129
b2c99e3c	130	out:
f7750a79	131	early_memunmap(pcdp, 4096);
b2c99e3c	132	return rc;
1da177e4	133	}