x86: Add support for the Simple Firmware Interface (SFI)
This provides a way of passing information to Linux without requiring the
full ACPI horror. Provide a rudimentary implementation sufficient to be
recognised and parsed by Linux.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/include/asm/sfi.h b/arch/x86/include/asm/sfi.h
new file mode 100644
index 0000000..d1f0f0c
--- /dev/null
+++ b/arch/x86/include/asm/sfi.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright(c) 2009 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
+ */
+
+#ifndef _LINUX_SFI_H
+#define _LINUX_SFI_H
+
+#include <errno.h>
+#include <linux/types.h>
+
+/* Table signatures reserved by the SFI specification */
+#define SFI_SIG_SYST "SYST"
+#define SFI_SIG_FREQ "FREQ"
+#define SFI_SIG_CPUS "CPUS"
+#define SFI_SIG_MTMR "MTMR"
+#define SFI_SIG_MRTC "MRTC"
+#define SFI_SIG_MMAP "MMAP"
+#define SFI_SIG_APIC "APIC"
+#define SFI_SIG_XSDT "XSDT"
+#define SFI_SIG_WAKE "WAKE"
+#define SFI_SIG_DEVS "DEVS"
+#define SFI_SIG_GPIO "GPIO"
+
+#define SFI_SIGNATURE_SIZE 4
+#define SFI_OEM_ID_SIZE 6
+#define SFI_OEM_TABLE_ID_SIZE 8
+
+#define SFI_NAME_LEN 16
+#define SFI_TABLE_MAX_ENTRIES 16
+
+#define SFI_GET_NUM_ENTRIES(ptable, entry_type) \
+ ((ptable->header.len - sizeof(struct sfi_table_header)) / \
+ (sizeof(entry_type)))
+/*
+ * Table structures must be byte-packed to match the SFI specification,
+ * as they are provided by the BIOS.
+ */
+struct __packed sfi_table_header {
+ char sig[SFI_SIGNATURE_SIZE];
+ u32 len;
+ u8 rev;
+ u8 csum;
+ char oem_id[SFI_OEM_ID_SIZE];
+ char oem_table_id[SFI_OEM_TABLE_ID_SIZE];
+};
+
+struct __packed sfi_table_simple {
+ struct sfi_table_header header;
+ u64 pentry[1];
+};
+
+/* Comply with UEFI spec 2.1 */
+struct __packed sfi_mem_entry {
+ u32 type;
+ u64 phys_start;
+ u64 virt_start;
+ u64 pages;
+ u64 attrib;
+};
+
+struct __packed sfi_cpu_table_entry {
+ u32 apic_id;
+};
+
+struct __packed sfi_cstate_table_entry {
+ u32 hint; /* MWAIT hint */
+ u32 latency; /* latency in ms */
+};
+
+struct __packed sfi_apic_table_entry {
+ u64 phys_addr; /* phy base addr for APIC reg */
+};
+
+struct __packed sfi_freq_table_entry {
+ u32 freq_mhz; /* in MHZ */
+ u32 latency; /* transition latency in ms */
+ u32 ctrl_val; /* value to write to PERF_CTL */
+};
+
+struct __packed sfi_wake_table_entry {
+ u64 phys_addr; /* pointer to where the wake vector locates */
+};
+
+struct __packed sfi_timer_table_entry {
+ u64 phys_addr; /* phy base addr for the timer */
+ u32 freq_hz; /* in HZ */
+ u32 irq;
+};
+
+struct __packed sfi_rtc_table_entry {
+ u64 phys_addr; /* phy base addr for the RTC */
+ u32 irq;
+};
+
+struct __packed sfi_device_table_entry {
+ u8 type; /* bus type, I2C, SPI or ...*/
+ u8 host_num; /* attached to host 0, 1...*/
+ u16 addr;
+ u8 irq;
+ u32 max_freq;
+ char name[SFI_NAME_LEN];
+};
+
+enum {
+ SFI_DEV_TYPE_SPI = 0,
+ SFI_DEV_TYPE_I2C,
+ SFI_DEV_TYPE_UART,
+ SFI_DEV_TYPE_HSI,
+ SFI_DEV_TYPE_IPC,
+ SFI_DEV_TYPE_SD,
+};
+
+struct __packed sfi_gpio_table_entry {
+ char controller_name[SFI_NAME_LEN];
+ u16 pin_no;
+ char pin_name[SFI_NAME_LEN];
+};
+
+struct sfi_xsdt_header {
+ uint32_t oem_revision;
+ uint32_t creator_id;
+ uint32_t creator_revision;
+};
+
+typedef int (*sfi_table_handler) (struct sfi_table_header *table);
+
+/**
+ * write_sfi_table() - Write Simple Firmware Interface tables
+ *
+ * @base: Address to write table to
+ * @return address to use for the next table
+ */
+u32 write_sfi_table(u32 base);
+
+#endif /*_LINUX_SFI_H */