^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * I/O delay strategies for inb_p/outb_p
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Allow for a DMI based override of port 0x80, needed for certain HP laptops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * and possibly other systems. Also allow for the gradual elimination of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * outb_p/inb_p API uses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define IO_DELAY_TYPE_0X80 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define IO_DELAY_TYPE_0XED 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define IO_DELAY_TYPE_UDELAY 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define IO_DELAY_TYPE_NONE 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #if defined(CONFIG_IO_DELAY_0X80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define DEFAULT_IO_DELAY_TYPE IO_DELAY_TYPE_0X80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #elif defined(CONFIG_IO_DELAY_0XED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DEFAULT_IO_DELAY_TYPE IO_DELAY_TYPE_0XED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #elif defined(CONFIG_IO_DELAY_UDELAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define DEFAULT_IO_DELAY_TYPE IO_DELAY_TYPE_UDELAY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #elif defined(CONFIG_IO_DELAY_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define DEFAULT_IO_DELAY_TYPE IO_DELAY_TYPE_NONE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int io_delay_type __read_mostly = DEFAULT_IO_DELAY_TYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int __initdata io_delay_override;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Paravirt wants native_io_delay to be a constant.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void native_io_delay(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) switch (io_delay_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) case IO_DELAY_TYPE_0X80:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) asm volatile ("outb %al, $0x80");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) case IO_DELAY_TYPE_0XED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) asm volatile ("outb %al, $0xed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) case IO_DELAY_TYPE_UDELAY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * 2 usecs is an upper-bound for the outb delay but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * note that udelay doesn't have the bus-level
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * side-effects that outb does, nor does udelay() have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * precise timings during very early bootup (the delays
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * are shorter until calibrated):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) udelay(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) case IO_DELAY_TYPE_NONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) EXPORT_SYMBOL(native_io_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int __init dmi_io_delay_0xed_port(const struct dmi_system_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (io_delay_type == IO_DELAY_TYPE_0X80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) pr_notice("%s: using 0xed I/O delay port\n", id->ident);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) io_delay_type = IO_DELAY_TYPE_0XED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Quirk table for systems that misbehave (lock up, etc.) if port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * 0x80 is used:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static const struct dmi_system_id io_delay_0xed_port_dmi_table[] __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .callback = dmi_io_delay_0xed_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .ident = "Compaq Presario V6000",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) DMI_MATCH(DMI_BOARD_NAME, "30B7")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) .callback = dmi_io_delay_0xed_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .ident = "HP Pavilion dv9000z",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) DMI_MATCH(DMI_BOARD_NAME, "30B9")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .callback = dmi_io_delay_0xed_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .ident = "HP Pavilion dv6000",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) DMI_MATCH(DMI_BOARD_NAME, "30B8")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .callback = dmi_io_delay_0xed_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .ident = "HP Pavilion tx1000",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) DMI_MATCH(DMI_BOARD_NAME, "30BF")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .callback = dmi_io_delay_0xed_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .ident = "Presario F700",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) DMI_MATCH(DMI_BOARD_NAME, "30D3")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void __init io_delay_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!io_delay_override)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) dmi_check_system(io_delay_0xed_port_dmi_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int __init io_delay_param(char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!strcmp(s, "0x80"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) io_delay_type = IO_DELAY_TYPE_0X80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) else if (!strcmp(s, "0xed"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) io_delay_type = IO_DELAY_TYPE_0XED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) else if (!strcmp(s, "udelay"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) io_delay_type = IO_DELAY_TYPE_UDELAY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) else if (!strcmp(s, "none"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) io_delay_type = IO_DELAY_TYPE_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) io_delay_override = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) early_param("io_delay", io_delay_param);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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