Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * I/O delay strategies for inb_p/outb_p |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 3 | * |
| 4 | * Allow for a DMI based override of port 0x80, needed for certain HP laptops |
| 5 | * and possibly other systems. Also allow for the gradual elimination of |
| 6 | * outb_p/inb_p API uses. |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 7 | */ |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/module.h> |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 10 | #include <linux/delay.h> |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 11 | #include <linux/init.h> |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 12 | #include <linux/dmi.h> |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 13 | #include <linux/io.h> |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 14 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 15 | int io_delay_type __read_mostly = CONFIG_DEFAULT_IO_DELAY_TYPE; |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 16 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 17 | static int __initdata io_delay_override; |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 18 | |
| 19 | /* |
| 20 | * Paravirt wants native_io_delay to be a constant. |
| 21 | */ |
| 22 | void native_io_delay(void) |
| 23 | { |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 24 | switch (io_delay_type) { |
| 25 | default: |
| 26 | case CONFIG_IO_DELAY_TYPE_0X80: |
| 27 | asm volatile ("outb %al, $0x80"); |
| 28 | break; |
| 29 | case CONFIG_IO_DELAY_TYPE_0XED: |
| 30 | asm volatile ("outb %al, $0xed"); |
| 31 | break; |
| 32 | case CONFIG_IO_DELAY_TYPE_UDELAY: |
| 33 | /* |
| 34 | * 2 usecs is an upper-bound for the outb delay but |
| 35 | * note that udelay doesn't have the bus-level |
| 36 | * side-effects that outb does, nor does udelay() have |
| 37 | * precise timings during very early bootup (the delays |
| 38 | * are shorter until calibrated): |
| 39 | */ |
| 40 | udelay(2); |
| 41 | case CONFIG_IO_DELAY_TYPE_NONE: |
| 42 | break; |
| 43 | } |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 44 | } |
| 45 | EXPORT_SYMBOL(native_io_delay); |
| 46 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 47 | static int __init dmi_io_delay_0xed_port(const struct dmi_system_id *id) |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 48 | { |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 49 | if (io_delay_type == CONFIG_IO_DELAY_TYPE_0X80) { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 50 | pr_notice("%s: using 0xed I/O delay port\n", id->ident); |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 51 | io_delay_type = CONFIG_IO_DELAY_TYPE_0XED; |
| 52 | } |
| 53 | |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 54 | return 0; |
| 55 | } |
| 56 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 57 | /* |
| 58 | * Quirk table for systems that misbehave (lock up, etc.) if port |
| 59 | * 0x80 is used: |
| 60 | */ |
| 61 | static struct dmi_system_id __initdata io_delay_0xed_port_dmi_table[] = { |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 62 | { |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 63 | .callback = dmi_io_delay_0xed_port, |
Ingo Molnar | f9fc589 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 64 | .ident = "Compaq Presario V6000", |
| 65 | .matches = { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 66 | DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), |
| 67 | DMI_MATCH(DMI_BOARD_NAME, "30B7") |
Ingo Molnar | f9fc589 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 68 | } |
| 69 | }, |
| 70 | { |
| 71 | .callback = dmi_io_delay_0xed_port, |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 72 | .ident = "HP Pavilion dv9000z", |
| 73 | .matches = { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 74 | DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), |
| 75 | DMI_MATCH(DMI_BOARD_NAME, "30B9") |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 76 | } |
| 77 | }, |
Ingo Molnar | f9fc589 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 78 | { |
| 79 | .callback = dmi_io_delay_0xed_port, |
Ingo Molnar | 3c274c2 | 2008-03-21 10:06:32 +0100 | [diff] [blame] | 80 | .ident = "HP Pavilion dv6000", |
| 81 | .matches = { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 82 | DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), |
| 83 | DMI_MATCH(DMI_BOARD_NAME, "30B8") |
Ingo Molnar | 3c274c2 | 2008-03-21 10:06:32 +0100 | [diff] [blame] | 84 | } |
| 85 | }, |
| 86 | { |
| 87 | .callback = dmi_io_delay_0xed_port, |
Ingo Molnar | f9fc589 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 88 | .ident = "HP Pavilion tx1000", |
| 89 | .matches = { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 90 | DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), |
| 91 | DMI_MATCH(DMI_BOARD_NAME, "30BF") |
Ingo Molnar | f9fc589 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 92 | } |
| 93 | }, |
Chuck Ebbert | e6a5652 | 2008-09-03 19:33:14 -0400 | [diff] [blame] | 94 | { |
| 95 | .callback = dmi_io_delay_0xed_port, |
| 96 | .ident = "Presario F700", |
| 97 | .matches = { |
Jaswinder Singh Rajput | d53a444 | 2009-03-21 16:57:04 +0530 | [diff] [blame] | 98 | DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), |
| 99 | DMI_MATCH(DMI_BOARD_NAME, "30D3") |
Chuck Ebbert | e6a5652 | 2008-09-03 19:33:14 -0400 | [diff] [blame] | 100 | } |
| 101 | }, |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 102 | { } |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 103 | }; |
| 104 | |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 105 | void __init io_delay_init(void) |
| 106 | { |
| 107 | if (!io_delay_override) |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 108 | dmi_check_system(io_delay_0xed_port_dmi_table); |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 109 | } |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 110 | |
| 111 | static int __init io_delay_param(char *s) |
| 112 | { |
Cyrill Gorcunov | d6cd7ef | 2008-07-05 15:53:37 +0400 | [diff] [blame] | 113 | if (!s) |
| 114 | return -EINVAL; |
| 115 | |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 116 | if (!strcmp(s, "0x80")) |
| 117 | io_delay_type = CONFIG_IO_DELAY_TYPE_0X80; |
| 118 | else if (!strcmp(s, "0xed")) |
| 119 | io_delay_type = CONFIG_IO_DELAY_TYPE_0XED; |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 120 | else if (!strcmp(s, "udelay")) |
Ingo Molnar | 6e7c402 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 121 | io_delay_type = CONFIG_IO_DELAY_TYPE_UDELAY; |
| 122 | else if (!strcmp(s, "none")) |
| 123 | io_delay_type = CONFIG_IO_DELAY_TYPE_NONE; |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 124 | else |
| 125 | return -EINVAL; |
| 126 | |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 127 | io_delay_override = 1; |
Rene Herman | b02aae9 | 2008-01-30 13:30:05 +0100 | [diff] [blame] | 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | early_param("io_delay", io_delay_param); |