Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License as |
| 6 | * published by the Free Software Foundation; either version 2 of the |
| 7 | * License, or any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
Michael Brown | c44a193 | 2009-05-01 15:41:06 +0100 | [diff] [blame^] | 19 | FILE_LICENCE ( GPL2_OR_LATER ); |
| 20 | |
Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 21 | #include <assert.h> |
| 22 | #include <gpxe/io.h> |
| 23 | #include <gpxe/efi/efi.h> |
| 24 | #include <gpxe/efi/Protocol/CpuIo.h> |
| 25 | #include <gpxe/efi/efi_io.h> |
| 26 | |
| 27 | /** @file |
| 28 | * |
| 29 | * gPXE I/O API for EFI |
| 30 | * |
| 31 | */ |
| 32 | |
| 33 | /** CPU I/O protocol */ |
| 34 | static EFI_CPU_IO_PROTOCOL *cpu_io; |
| 35 | EFI_REQUIRE_PROTOCOL ( EFI_CPU_IO_PROTOCOL, &cpu_io ); |
| 36 | |
| 37 | /** Maximum address that can be used for port I/O */ |
| 38 | #define MAX_PORT_ADDRESS 0xffff |
| 39 | |
| 40 | /** |
| 41 | * Determine whether or not address is a port I/O address |
| 42 | * |
| 43 | * @v io_addr I/O address |
| 44 | * @v is_port I/O address is a port I/O address |
| 45 | */ |
| 46 | #define IS_PORT_ADDRESS(io_addr) \ |
| 47 | ( ( ( intptr_t ) (io_addr) ) <= MAX_PORT_ADDRESS ) |
| 48 | |
| 49 | /** |
| 50 | * Determine EFI CPU I/O width code |
| 51 | * |
| 52 | * @v size Size of value |
| 53 | * @ret width EFI width code |
| 54 | * |
| 55 | * Someone at Intel clearly gets paid by the number of lines of code |
| 56 | * they write. No-one should ever be able to make I/O this |
| 57 | * convoluted. The EFI_CPU_IO_PROTOCOL_WIDTH enum is my favourite |
| 58 | * idiocy. |
| 59 | */ |
| 60 | static EFI_CPU_IO_PROTOCOL_WIDTH efi_width ( size_t size ) { |
| 61 | switch ( size ) { |
| 62 | case 1 : return EfiCpuIoWidthFifoUint8; |
| 63 | case 2 : return EfiCpuIoWidthFifoUint16; |
| 64 | case 4 : return EfiCpuIoWidthFifoUint32; |
| 65 | case 8 : return EfiCpuIoWidthFifoUint64; |
| 66 | default : |
| 67 | assert ( 0 ); |
| 68 | /* I wonder what this will actually do... */ |
| 69 | return EfiCpuIoWidthMaximum; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Read from device |
| 75 | * |
| 76 | * @v io_addr I/O address |
| 77 | * @v size Size of value |
| 78 | * @ret data Value read |
| 79 | */ |
| 80 | unsigned long long efi_ioread ( volatile void *io_addr, size_t size ) { |
| 81 | EFI_CPU_IO_PROTOCOL_IO_MEM read; |
| 82 | unsigned long long data = 0; |
| 83 | EFI_STATUS efirc; |
| 84 | |
| 85 | read = ( IS_PORT_ADDRESS ( io_addr ) ? |
| 86 | cpu_io->Io.Read : cpu_io->Mem.Read ); |
| 87 | |
| 88 | if ( ( efirc = read ( cpu_io, efi_width ( size ), |
| 89 | ( intptr_t ) io_addr, 1, |
| 90 | ( void * ) &data ) ) != 0 ) { |
Michael Brown | 3f85626 | 2008-11-18 19:45:44 -0800 | [diff] [blame] | 91 | DBG ( "EFI I/O read at %p failed: %s\n", |
| 92 | io_addr, efi_strerror ( efirc ) ); |
Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 93 | return -1ULL; |
| 94 | } |
| 95 | |
| 96 | return data; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Write to device |
| 101 | * |
| 102 | * @v data Value to write |
| 103 | * @v io_addr I/O address |
| 104 | * @v size Size of value |
| 105 | */ |
| 106 | void efi_iowrite ( unsigned long long data, volatile void *io_addr, |
| 107 | size_t size ) { |
| 108 | EFI_CPU_IO_PROTOCOL_IO_MEM write; |
| 109 | EFI_STATUS efirc; |
| 110 | |
| 111 | write = ( IS_PORT_ADDRESS ( io_addr ) ? |
| 112 | cpu_io->Io.Write : cpu_io->Mem.Write ); |
| 113 | |
| 114 | if ( ( efirc = write ( cpu_io, efi_width ( size ), |
| 115 | ( intptr_t ) io_addr, 1, |
| 116 | ( void * ) &data ) ) != 0 ) { |
Michael Brown | 3f85626 | 2008-11-18 19:45:44 -0800 | [diff] [blame] | 117 | DBG ( "EFI I/O write at %p failed: %s\n", |
| 118 | io_addr, efi_strerror ( efirc ) ); |
Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * String read from device |
| 124 | * |
| 125 | * @v io_addr I/O address |
| 126 | * @v data Data buffer |
| 127 | * @v size Size of values |
| 128 | * @v count Number of values to read |
| 129 | */ |
| 130 | void efi_ioreads ( volatile void *io_addr, void *data, |
| 131 | size_t size, unsigned int count ) { |
| 132 | EFI_CPU_IO_PROTOCOL_IO_MEM read; |
| 133 | EFI_STATUS efirc; |
| 134 | |
| 135 | read = ( IS_PORT_ADDRESS ( io_addr ) ? |
| 136 | cpu_io->Io.Read : cpu_io->Mem.Read ); |
| 137 | |
| 138 | if ( ( efirc = read ( cpu_io, efi_width ( size ), |
| 139 | ( intptr_t ) io_addr, count, |
| 140 | ( void * ) data ) ) != 0 ) { |
Michael Brown | 3f85626 | 2008-11-18 19:45:44 -0800 | [diff] [blame] | 141 | DBG ( "EFI I/O string read at %p failed: %s\n", |
| 142 | io_addr, efi_strerror ( efirc ) ); |
Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 143 | } |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * String write to device |
| 148 | * |
| 149 | * @v io_addr I/O address |
| 150 | * @v data Data buffer |
| 151 | * @v size Size of values |
| 152 | * @v count Number of values to write |
| 153 | */ |
| 154 | void efi_iowrites ( volatile void *io_addr, const void *data, |
| 155 | size_t size, unsigned int count ) { |
| 156 | EFI_CPU_IO_PROTOCOL_IO_MEM write; |
| 157 | EFI_STATUS efirc; |
| 158 | |
| 159 | write = ( IS_PORT_ADDRESS ( io_addr ) ? |
| 160 | cpu_io->Io.Write : cpu_io->Mem.Write ); |
| 161 | |
| 162 | if ( ( efirc = write ( cpu_io, efi_width ( size ), |
| 163 | ( intptr_t ) io_addr, count, |
| 164 | ( void * ) data ) ) != 0 ) { |
Michael Brown | 3f85626 | 2008-11-18 19:45:44 -0800 | [diff] [blame] | 165 | DBG ( "EFI I/O write at %p failed: %s\n", |
| 166 | io_addr, efi_strerror ( efirc ) ); |
Michael Brown | 81d92c6 | 2008-10-12 01:55:55 +0100 | [diff] [blame] | 167 | } |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Wait for I/O-mapped operation to complete |
| 172 | * |
| 173 | */ |
| 174 | static void efi_iodelay ( void ) { |
| 175 | /* Write to non-existent port. Probably x86-only. */ |
| 176 | outb ( 0, 0x80 ); |
| 177 | } |
| 178 | |
| 179 | PROVIDE_IOAPI_INLINE ( efi, phys_to_bus ); |
| 180 | PROVIDE_IOAPI_INLINE ( efi, bus_to_phys ); |
| 181 | PROVIDE_IOAPI_INLINE ( efi, ioremap ); |
| 182 | PROVIDE_IOAPI_INLINE ( efi, iounmap ); |
| 183 | PROVIDE_IOAPI_INLINE ( efi, io_to_bus ); |
| 184 | PROVIDE_IOAPI_INLINE ( efi, readb ); |
| 185 | PROVIDE_IOAPI_INLINE ( efi, readw ); |
| 186 | PROVIDE_IOAPI_INLINE ( efi, readl ); |
| 187 | PROVIDE_IOAPI_INLINE ( efi, readq ); |
| 188 | PROVIDE_IOAPI_INLINE ( efi, writeb ); |
| 189 | PROVIDE_IOAPI_INLINE ( efi, writew ); |
| 190 | PROVIDE_IOAPI_INLINE ( efi, writel ); |
| 191 | PROVIDE_IOAPI_INLINE ( efi, writeq ); |
| 192 | PROVIDE_IOAPI_INLINE ( efi, inb ); |
| 193 | PROVIDE_IOAPI_INLINE ( efi, inw ); |
| 194 | PROVIDE_IOAPI_INLINE ( efi, inl ); |
| 195 | PROVIDE_IOAPI_INLINE ( efi, outb ); |
| 196 | PROVIDE_IOAPI_INLINE ( efi, outw ); |
| 197 | PROVIDE_IOAPI_INLINE ( efi, outl ); |
| 198 | PROVIDE_IOAPI_INLINE ( efi, insb ); |
| 199 | PROVIDE_IOAPI_INLINE ( efi, insw ); |
| 200 | PROVIDE_IOAPI_INLINE ( efi, insl ); |
| 201 | PROVIDE_IOAPI_INLINE ( efi, outsb ); |
| 202 | PROVIDE_IOAPI_INLINE ( efi, outsw ); |
| 203 | PROVIDE_IOAPI_INLINE ( efi, outsl ); |
| 204 | PROVIDE_IOAPI ( efi, iodelay, efi_iodelay ); |
| 205 | PROVIDE_IOAPI_INLINE ( efi, mb ); |