linux/include/linux/sfi.h
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   1/* sfi.h Simple Firmware Interface */
   2
   3/*
   4
   5  This file is provided under a dual BSD/GPLv2 license.  When using or
   6  redistributing this file, you may do so under either license.
   7
   8  GPL LICENSE SUMMARY
   9
  10  Copyright(c) 2009 Intel Corporation. All rights reserved.
  11
  12  This program is free software; you can redistribute it and/or modify
  13  it under the terms of version 2 of the GNU General Public License as
  14  published by the Free Software Foundation.
  15
  16  This program is distributed in the hope that it will be useful, but
  17  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  General Public License for more details.
  20
  21  You should have received a copy of the GNU General Public License
  22  along with this program; if not, write to the Free Software
  23  Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  24  The full GNU General Public License is included in this distribution
  25  in the file called LICENSE.GPL.
  26
  27  BSD LICENSE
  28
  29  Copyright(c) 2009 Intel Corporation. All rights reserved.
  30
  31  Redistribution and use in source and binary forms, with or without
  32  modification, are permitted provided that the following conditions
  33  are met:
  34
  35    * Redistributions of source code must retain the above copyright
  36      notice, this list of conditions and the following disclaimer.
  37    * Redistributions in binary form must reproduce the above copyright
  38      notice, this list of conditions and the following disclaimer in
  39      the documentation and/or other materials provided with the
  40      distribution.
  41    * Neither the name of Intel Corporation nor the names of its
  42      contributors may be used to endorse or promote products derived
  43      from this software without specific prior written permission.
  44
  45  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  46  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  47  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  48  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  49  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  50  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  51  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  52  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  53  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  54  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  55  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  56
  57*/
  58
  59#ifndef _LINUX_SFI_H
  60#define _LINUX_SFI_H
  61
  62/* Table signatures reserved by the SFI specification */
  63#define SFI_SIG_SYST            "SYST"
  64#define SFI_SIG_FREQ            "FREQ"
  65#define SFI_SIG_IDLE            "IDLE"
  66#define SFI_SIG_CPUS            "CPUS"
  67#define SFI_SIG_MTMR            "MTMR"
  68#define SFI_SIG_MRTC            "MRTC"
  69#define SFI_SIG_MMAP            "MMAP"
  70#define SFI_SIG_APIC            "APIC"
  71#define SFI_SIG_XSDT            "XSDT"
  72#define SFI_SIG_WAKE            "WAKE"
  73#define SFI_SIG_DEVS            "DEVS"
  74#define SFI_SIG_GPIO            "GPIO"
  75
  76#define SFI_SIGNATURE_SIZE      4
  77#define SFI_OEM_ID_SIZE         6
  78#define SFI_OEM_TABLE_ID_SIZE   8
  79
  80#define SFI_NAME_LEN            16
  81
  82#define SFI_SYST_SEARCH_BEGIN           0x000E0000
  83#define SFI_SYST_SEARCH_END             0x000FFFFF
  84
  85#define SFI_GET_NUM_ENTRIES(ptable, entry_type) \
  86        ((ptable->header.len - sizeof(struct sfi_table_header)) / \
  87        (sizeof(entry_type)))
  88/*
  89 * Table structures must be byte-packed to match the SFI specification,
  90 * as they are provided by the BIOS.
  91 */
  92struct sfi_table_header {
  93        char    sig[SFI_SIGNATURE_SIZE];
  94        u32     len;
  95        u8      rev;
  96        u8      csum;
  97        char    oem_id[SFI_OEM_ID_SIZE];
  98        char    oem_table_id[SFI_OEM_TABLE_ID_SIZE];
  99} __packed;
 100
 101struct sfi_table_simple {
 102        struct sfi_table_header         header;
 103        u64                             pentry[1];
 104} __packed;
 105
 106/* Comply with UEFI spec 2.1 */
 107struct sfi_mem_entry {
 108        u32     type;
 109        u64     phys_start;
 110        u64     virt_start;
 111        u64     pages;
 112        u64     attrib;
 113} __packed;
 114
 115struct sfi_cpu_table_entry {
 116        u32     apic_id;
 117} __packed;
 118
 119struct sfi_cstate_table_entry {
 120        u32     hint;           /* MWAIT hint */
 121        u32     latency;        /* latency in ms */
 122} __packed;
 123
 124struct sfi_apic_table_entry {
 125        u64     phys_addr;      /* phy base addr for APIC reg */
 126} __packed;
 127
 128struct sfi_freq_table_entry {
 129        u32     freq_mhz;       /* in MHZ */
 130        u32     latency;        /* transition latency in ms */
 131        u32     ctrl_val;       /* value to write to PERF_CTL */
 132} __packed;
 133
 134struct sfi_wake_table_entry {
 135        u64     phys_addr;      /* pointer to where the wake vector locates */
 136} __packed;
 137
 138struct sfi_timer_table_entry {
 139        u64     phys_addr;      /* phy base addr for the timer */
 140        u32     freq_hz;        /* in HZ */
 141        u32     irq;
 142} __packed;
 143
 144struct sfi_rtc_table_entry {
 145        u64     phys_addr;      /* phy base addr for the RTC */
 146        u32     irq;
 147} __packed;
 148
 149struct sfi_device_table_entry {
 150        u8      type;           /* bus type, I2C, SPI or ...*/
 151#define SFI_DEV_TYPE_SPI        0
 152#define SFI_DEV_TYPE_I2C        1
 153#define SFI_DEV_TYPE_UART       2
 154#define SFI_DEV_TYPE_HSI        3
 155#define SFI_DEV_TYPE_IPC        4
 156
 157        u8      host_num;       /* attached to host 0, 1...*/
 158        u16     addr;
 159        u8      irq;
 160        u32     max_freq;
 161        char    name[SFI_NAME_LEN];
 162} __packed;
 163
 164struct sfi_gpio_table_entry {
 165        char    controller_name[SFI_NAME_LEN];
 166        u16     pin_no;
 167        char    pin_name[SFI_NAME_LEN];
 168} __packed;
 169
 170typedef int (*sfi_table_handler) (struct sfi_table_header *table);
 171
 172#ifdef CONFIG_SFI
 173extern void __init sfi_init(void);
 174extern int __init sfi_platform_init(void);
 175extern void __init sfi_init_late(void);
 176extern int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id,
 177                                sfi_table_handler handler);
 178
 179extern int sfi_disabled;
 180static inline void disable_sfi(void)
 181{
 182        sfi_disabled = 1;
 183}
 184
 185#else /* !CONFIG_SFI */
 186
 187static inline void sfi_init(void)
 188{
 189}
 190
 191static inline void sfi_init_late(void)
 192{
 193}
 194
 195#define sfi_disabled    0
 196
 197static inline int sfi_table_parse(char *signature, char *oem_id,
 198                                        char *oem_table_id,
 199                                        sfi_table_handler handler)
 200{
 201        return -1;
 202}
 203
 204#endif /* !CONFIG_SFI */
 205
 206#endif /*_LINUX_SFI_H*/
 207
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