Orange Pi5 kernel

^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)  * Extensible Firmware Interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Based on Extensible Firmware Interface Specification version 2.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2013 - 2015 Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt)	"efi: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/fwnode.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/mm_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/of_fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/screen_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static int __init is_memory(efi_memory_desc_t *md)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  * Translate a EFI virtual address into a physical address: this is necessary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * as some data members of the EFI system table are virtually remapped after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * SetVirtualAddressMap() has been called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static phys_addr_t __init efi_to_phys(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	efi_memory_desc_t *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	for_each_efi_memory_desc(md) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		if (!(md->attribute & EFI_MEMORY_RUNTIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		if (md->virt_addr == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			/* no virtual mapping has been installed by the stub */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		if (md->virt_addr <= addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		    (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			return md->phys_addr + addr - md->virt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static const efi_config_table_type_t arch_tables[] __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static void __init init_screen_info(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct screen_info *si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (IS_ENABLED(CONFIG_ARM) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	    screen_info_table != EFI_INVALID_TABLE_ADDR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		si = early_memremap_ro(screen_info_table, sizeof(*si));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		if (!si) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			pr_err("Could not map screen_info config table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		screen_info = *si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		early_memunmap(si, sizeof(*si));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		/* dummycon on ARM needs non-zero values for columns/lines */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		screen_info.orig_video_cols = 80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		screen_info.orig_video_lines = 25;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	    memblock_is_map_memory(screen_info.lfb_base))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
^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) static int __init uefi_init(u64 efi_system_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	efi_config_table_t *config_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	efi_system_table_t *systab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	size_t table_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (systab == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		pr_warn("Unable to map EFI system table.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	set_bit(EFI_BOOT, &efi.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (IS_ENABLED(CONFIG_64BIT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		set_bit(EFI_64BIT, &efi.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	retval = efi_systab_check_header(&systab->hdr, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	efi.runtime = systab->runtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	efi.runtime_version = systab->hdr.revision;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	table_size = sizeof(efi_config_table_t) * systab->nr_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	config_tables = early_memremap_ro(efi_to_phys(systab->tables),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 					  table_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (config_tables == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		pr_warn("Unable to map EFI config table array.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	retval = efi_config_parse_tables(config_tables, systab->nr_tables,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 					 IS_ENABLED(CONFIG_ARM) ? arch_tables
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 								: NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	early_memunmap(config_tables, table_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	early_memunmap(systab, sizeof(efi_system_table_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * Return true for regions that can be used as System RAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static __init int is_usable_memory(efi_memory_desc_t *md)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	switch (md->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	case EFI_LOADER_CODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	case EFI_LOADER_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	case EFI_ACPI_RECLAIM_MEMORY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	case EFI_BOOT_SERVICES_CODE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	case EFI_BOOT_SERVICES_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	case EFI_CONVENTIONAL_MEMORY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	case EFI_PERSISTENT_MEMORY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		 * Special purpose memory is 'soft reserved', which means it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		 * is set aside initially, but can be hotplugged back in or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		 * be assigned to the dax driver after boot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (efi_soft_reserve_enabled() &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		    (md->attribute & EFI_MEMORY_SP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		 * According to the spec, these regions are no longer reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		 * after calling ExitBootServices(). However, we can only use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		 * them as System RAM if they can be mapped writeback cacheable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return (md->attribute & EFI_MEMORY_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static __init void reserve_regions(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	efi_memory_desc_t *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	u64 paddr, npages, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (efi_enabled(EFI_DBG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		pr_info("Processing EFI memory map:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	 * Discard memblocks discovered so far: if there are any at this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	 * point, they originate from memory nodes in the DT, and UEFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	 * uses its own memory map instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	memblock_dump_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	memblock_remove(0, PHYS_ADDR_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	for_each_efi_memory_desc(md) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		paddr = md->phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		npages = md->num_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		if (efi_enabled(EFI_DBG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			char buf[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			pr_info("  0x%012llx-0x%012llx %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				efi_md_typeattr_format(buf, sizeof(buf), md));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		memrange_efi_to_native(&paddr, &npages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		size = npages << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		if (is_memory(md)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			early_init_dt_add_memory_arch(paddr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			if (!is_usable_memory(md))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 				memblock_mark_nomap(paddr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			/* keep ACPI reclaim memory intact for kexec etc. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			if (md->type == EFI_ACPI_RECLAIM_MEMORY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				memblock_reserve(paddr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) void __init efi_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	struct efi_memory_map_data data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	u64 efi_system_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	/* Grab UEFI information placed in FDT by stub */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	efi_system_table = efi_get_fdt_params(&data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (!efi_system_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (efi_memmap_init_early(&data) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		* If we are booting via UEFI, the UEFI memory map is the only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		* description of memory we have, so there is little point in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		* proceeding if we cannot access it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		panic("Unable to map EFI memory map.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	WARN(efi.memmap.desc_version != 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	     "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	      efi.memmap.desc_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (uefi_init(efi_system_table) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		efi_memmap_unmap();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	reserve_regions();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	efi_esrt_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	efi_mokvar_table_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	memblock_reserve(data.phys_map & PAGE_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			 PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	init_screen_info();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) #ifdef CONFIG_ARM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	/* ARM does not permit early mappings to persist across paging_init() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	efi_memmap_unmap();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		struct efi_arm_entry_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		bool dump_state = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		state = early_memremap_ro(cpu_state_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 					  sizeof(struct efi_arm_entry_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		if (state == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			pr_warn("Unable to map CPU entry state table.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if ((state->sctlr_before_ebs & 1) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		else if ((state->sctlr_after_ebs & 1) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			dump_state = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		if (dump_state || efi_enabled(EFI_DBG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			pr_info("CPSR at EFI stub entry        : 0x%08x\n", state->cpsr_before_ebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			pr_info("SCTLR at EFI stub entry       : 0x%08x\n", state->sctlr_before_ebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		early_memunmap(state, sizeof(struct efi_arm_entry_state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	u64 fb_base = screen_info.lfb_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	return fb_base >= range->cpu_addr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	       fb_base < (range->cpu_addr + range->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static struct device_node *find_pci_overlap_node(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	for_each_node_by_type(np, "pci") {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		struct of_pci_range_parser parser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		struct of_pci_range range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		err = of_pci_range_parser_init(&parser, np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			pr_warn("of_pci_range_parser_init() failed: %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		for_each_of_pci_range(&parser, &range)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			if (efifb_overlaps_pci_range(&range))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 				return np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  * If the efifb framebuffer is backed by a PCI graphics controller, we have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  * to ensure that this relation is expressed using a device link when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  * running in DT mode, or the probe order may be reversed, resulting in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)  * resource reservation conflict on the memory window that the efifb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  * framebuffer steals from the PCIe host bridge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static int efifb_add_links(struct fwnode_handle *fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	struct device_node *sup_np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	sup_np = find_pci_overlap_node();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	 * If there's no PCI graphics controller backing the efifb, we are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	 * done here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	if (!sup_np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	fwnode_link_add(fwnode, of_fwnode_handle(sup_np));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	of_node_put(sup_np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) static const struct fwnode_operations efifb_fwnode_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	.add_links = efifb_add_links,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static struct fwnode_handle efifb_fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static int __init register_gop_device(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct platform_device *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	pd = platform_device_alloc("efi-framebuffer", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (!pd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	if (IS_ENABLED(CONFIG_PCI)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		fwnode_init(&efifb_fwnode, &efifb_fwnode_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		pd->dev.fwnode = &efifb_fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	return platform_device_add(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) subsys_initcall(register_gop_device);