fake_map-y += fake_mem.o
fake_map-$(CONFIG_X86) += x86_fake_mem.o
-arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
+arm-obj-$(CONFIG_EFI) := efi-init.o arm-runtime.o
obj-$(CONFIG_ARM) += $(arm-obj-y)
obj-$(CONFIG_ARM64) += $(arm-obj-y)
obj-$(CONFIG_EFI_CAPSULE_LOADER) += capsule-loader.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Extensible Firmware Interface
- *
- * Based on Extensible Firmware Interface Specification version 2.4
- *
- * Copyright (C) 2013 - 2015 Linaro Ltd.
- */
-
-#define pr_fmt(fmt) "efi: " fmt
-
-#include <linux/efi.h>
-#include <linux/fwnode.h>
-#include <linux/init.h>
-#include <linux/memblock.h>
-#include <linux/mm_types.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_fdt.h>
-#include <linux/platform_device.h>
-#include <linux/screen_info.h>
-
-#include <asm/efi.h>
-
-static int __init is_memory(efi_memory_desc_t *md)
-{
- if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
- return 1;
- return 0;
-}
-
-/*
- * Translate a EFI virtual address into a physical address: this is necessary,
- * as some data members of the EFI system table are virtually remapped after
- * SetVirtualAddressMap() has been called.
- */
-static phys_addr_t __init efi_to_phys(unsigned long addr)
-{
- efi_memory_desc_t *md;
-
- for_each_efi_memory_desc(md) {
- if (!(md->attribute & EFI_MEMORY_RUNTIME))
- continue;
- if (md->virt_addr == 0)
- /* no virtual mapping has been installed by the stub */
- break;
- if (md->virt_addr <= addr &&
- (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
- return md->phys_addr + addr - md->virt_addr;
- }
- return addr;
-}
-
-static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
-static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR;
-
-static const efi_config_table_type_t arch_tables[] __initconst = {
- {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
- {LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
- {}
-};
-
-static void __init init_screen_info(void)
-{
- struct screen_info *si;
-
- if (IS_ENABLED(CONFIG_ARM) &&
- screen_info_table != EFI_INVALID_TABLE_ADDR) {
- si = early_memremap_ro(screen_info_table, sizeof(*si));
- if (!si) {
- pr_err("Could not map screen_info config table\n");
- return;
- }
- screen_info = *si;
- early_memunmap(si, sizeof(*si));
-
- /* dummycon on ARM needs non-zero values for columns/lines */
- screen_info.orig_video_cols = 80;
- screen_info.orig_video_lines = 25;
- }
-
- if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
- memblock_is_map_memory(screen_info.lfb_base))
- memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
-}
-
-static int __init uefi_init(u64 efi_system_table)
-{
- efi_config_table_t *config_tables;
- efi_system_table_t *systab;
- size_t table_size;
- int retval;
-
- systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
- if (systab == NULL) {
- pr_warn("Unable to map EFI system table.\n");
- return -ENOMEM;
- }
-
- set_bit(EFI_BOOT, &efi.flags);
- if (IS_ENABLED(CONFIG_64BIT))
- set_bit(EFI_64BIT, &efi.flags);
-
- retval = efi_systab_check_header(&systab->hdr, 2);
- if (retval)
- goto out;
-
- efi.runtime = systab->runtime;
- efi.runtime_version = systab->hdr.revision;
-
- efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
-
- table_size = sizeof(efi_config_table_t) * systab->nr_tables;
- config_tables = early_memremap_ro(efi_to_phys(systab->tables),
- table_size);
- if (config_tables == NULL) {
- pr_warn("Unable to map EFI config table array.\n");
- retval = -ENOMEM;
- goto out;
- }
- retval = efi_config_parse_tables(config_tables, systab->nr_tables,
- IS_ENABLED(CONFIG_ARM) ? arch_tables
- : NULL);
-
- early_memunmap(config_tables, table_size);
-out:
- early_memunmap(systab, sizeof(efi_system_table_t));
- return retval;
-}
-
-/*
- * Return true for regions that can be used as System RAM.
- */
-static __init int is_usable_memory(efi_memory_desc_t *md)
-{
- switch (md->type) {
- case EFI_LOADER_CODE:
- case EFI_LOADER_DATA:
- case EFI_ACPI_RECLAIM_MEMORY:
- case EFI_BOOT_SERVICES_CODE:
- case EFI_BOOT_SERVICES_DATA:
- case EFI_CONVENTIONAL_MEMORY:
- case EFI_PERSISTENT_MEMORY:
- /*
- * Special purpose memory is 'soft reserved', which means it
- * is set aside initially, but can be hotplugged back in or
- * be assigned to the dax driver after boot.
- */
- if (efi_soft_reserve_enabled() &&
- (md->attribute & EFI_MEMORY_SP))
- return false;
-
- /*
- * According to the spec, these regions are no longer reserved
- * after calling ExitBootServices(). However, we can only use
- * them as System RAM if they can be mapped writeback cacheable.
- */
- return (md->attribute & EFI_MEMORY_WB);
- default:
- break;
- }
- return false;
-}
-
-static __init void reserve_regions(void)
-{
- efi_memory_desc_t *md;
- u64 paddr, npages, size;
-
- if (efi_enabled(EFI_DBG))
- pr_info("Processing EFI memory map:\n");
-
- /*
- * Discard memblocks discovered so far: if there are any at this
- * point, they originate from memory nodes in the DT, and UEFI
- * uses its own memory map instead.
- */
- memblock_dump_all();
- memblock_remove(0, PHYS_ADDR_MAX);
-
- for_each_efi_memory_desc(md) {
- paddr = md->phys_addr;
- npages = md->num_pages;
-
- if (efi_enabled(EFI_DBG)) {
- char buf[64];
-
- pr_info(" 0x%012llx-0x%012llx %s\n",
- paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
- efi_md_typeattr_format(buf, sizeof(buf), md));
- }
-
- memrange_efi_to_native(&paddr, &npages);
- size = npages << PAGE_SHIFT;
-
- if (is_memory(md)) {
- early_init_dt_add_memory_arch(paddr, size);
-
- if (!is_usable_memory(md))
- memblock_mark_nomap(paddr, size);
-
- /* keep ACPI reclaim memory intact for kexec etc. */
- if (md->type == EFI_ACPI_RECLAIM_MEMORY)
- memblock_reserve(paddr, size);
- }
- }
-}
-
-void __init efi_init(void)
-{
- struct efi_memory_map_data data;
- u64 efi_system_table;
-
- /* Grab UEFI information placed in FDT by stub */
- efi_system_table = efi_get_fdt_params(&data);
- if (!efi_system_table)
- return;
-
- if (efi_memmap_init_early(&data) < 0) {
- /*
- * If we are booting via UEFI, the UEFI memory map is the only
- * description of memory we have, so there is little point in
- * proceeding if we cannot access it.
- */
- panic("Unable to map EFI memory map.\n");
- }
-
- WARN(efi.memmap.desc_version != 1,
- "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
- efi.memmap.desc_version);
-
- if (uefi_init(efi_system_table) < 0) {
- efi_memmap_unmap();
- return;
- }
-
- reserve_regions();
- efi_esrt_init();
-
- memblock_reserve(data.phys_map & PAGE_MASK,
- PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
-
- init_screen_info();
-
-#ifdef CONFIG_ARM
- /* ARM does not permit early mappings to persist across paging_init() */
- efi_memmap_unmap();
-
- if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
- struct efi_arm_entry_state *state;
- bool dump_state = true;
-
- state = early_memremap_ro(cpu_state_table,
- sizeof(struct efi_arm_entry_state));
- if (state == NULL) {
- pr_warn("Unable to map CPU entry state table.\n");
- return;
- }
-
- if ((state->sctlr_before_ebs & 1) == 0)
- pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
- else if ((state->sctlr_after_ebs & 1) == 0)
- pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
- else
- dump_state = false;
-
- if (dump_state || efi_enabled(EFI_DBG)) {
- pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs);
- pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs);
- pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs);
- pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs);
- }
- early_memunmap(state, sizeof(struct efi_arm_entry_state));
- }
-#endif
-}
-
-static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
-{
- u64 fb_base = screen_info.lfb_base;
-
- if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
- fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
-
- return fb_base >= range->cpu_addr &&
- fb_base < (range->cpu_addr + range->size);
-}
-
-static struct device_node *find_pci_overlap_node(void)
-{
- struct device_node *np;
-
- for_each_node_by_type(np, "pci") {
- struct of_pci_range_parser parser;
- struct of_pci_range range;
- int err;
-
- err = of_pci_range_parser_init(&parser, np);
- if (err) {
- pr_warn("of_pci_range_parser_init() failed: %d\n", err);
- continue;
- }
-
- for_each_of_pci_range(&parser, &range)
- if (efifb_overlaps_pci_range(&range))
- return np;
- }
- return NULL;
-}
-
-/*
- * If the efifb framebuffer is backed by a PCI graphics controller, we have
- * to ensure that this relation is expressed using a device link when
- * running in DT mode, or the probe order may be reversed, resulting in a
- * resource reservation conflict on the memory window that the efifb
- * framebuffer steals from the PCIe host bridge.
- */
-static int efifb_add_links(const struct fwnode_handle *fwnode,
- struct device *dev)
-{
- struct device_node *sup_np;
- struct device *sup_dev;
-
- sup_np = find_pci_overlap_node();
-
- /*
- * If there's no PCI graphics controller backing the efifb, we are
- * done here.
- */
- if (!sup_np)
- return 0;
-
- sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
- of_node_put(sup_np);
-
- /*
- * Return -ENODEV if the PCI graphics controller device hasn't been
- * registered yet. This ensures that efifb isn't allowed to probe
- * and this function is retried again when new devices are
- * registered.
- */
- if (!sup_dev)
- return -ENODEV;
-
- /*
- * If this fails, retrying this function at a later point won't
- * change anything. So, don't return an error after this.
- */
- if (!device_link_add(dev, sup_dev, fw_devlink_get_flags()))
- dev_warn(dev, "device_link_add() failed\n");
-
- put_device(sup_dev);
-
- return 0;
-}
-
-static const struct fwnode_operations efifb_fwnode_ops = {
- .add_links = efifb_add_links,
-};
-
-static struct fwnode_handle efifb_fwnode = {
- .ops = &efifb_fwnode_ops,
-};
-
-static int __init register_gop_device(void)
-{
- struct platform_device *pd;
- int err;
-
- if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
- return 0;
-
- pd = platform_device_alloc("efi-framebuffer", 0);
- if (!pd)
- return -ENOMEM;
-
- if (IS_ENABLED(CONFIG_PCI))
- pd->dev.fwnode = &efifb_fwnode;
-
- err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
- if (err)
- return err;
-
- return platform_device_add(pd);
-}
-subsys_initcall(register_gop_device);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Extensible Firmware Interface
+ *
+ * Based on Extensible Firmware Interface Specification version 2.4
+ *
+ * Copyright (C) 2013 - 2015 Linaro Ltd.
+ */
+
+#define pr_fmt(fmt) "efi: " fmt
+
+#include <linux/efi.h>
+#include <linux/fwnode.h>
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/mm_types.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+#include <linux/platform_device.h>
+#include <linux/screen_info.h>
+
+#include <asm/efi.h>
+
+static int __init is_memory(efi_memory_desc_t *md)
+{
+ if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
+ return 1;
+ return 0;
+}
+
+/*
+ * Translate a EFI virtual address into a physical address: this is necessary,
+ * as some data members of the EFI system table are virtually remapped after
+ * SetVirtualAddressMap() has been called.
+ */
+static phys_addr_t __init efi_to_phys(unsigned long addr)
+{
+ efi_memory_desc_t *md;
+
+ for_each_efi_memory_desc(md) {
+ if (!(md->attribute & EFI_MEMORY_RUNTIME))
+ continue;
+ if (md->virt_addr == 0)
+ /* no virtual mapping has been installed by the stub */
+ break;
+ if (md->virt_addr <= addr &&
+ (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
+ return md->phys_addr + addr - md->virt_addr;
+ }
+ return addr;
+}
+
+static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
+static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR;
+
+static const efi_config_table_type_t arch_tables[] __initconst = {
+ {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
+ {LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
+ {}
+};
+
+static void __init init_screen_info(void)
+{
+ struct screen_info *si;
+
+ if (IS_ENABLED(CONFIG_ARM) &&
+ screen_info_table != EFI_INVALID_TABLE_ADDR) {
+ si = early_memremap_ro(screen_info_table, sizeof(*si));
+ if (!si) {
+ pr_err("Could not map screen_info config table\n");
+ return;
+ }
+ screen_info = *si;
+ early_memunmap(si, sizeof(*si));
+
+ /* dummycon on ARM needs non-zero values for columns/lines */
+ screen_info.orig_video_cols = 80;
+ screen_info.orig_video_lines = 25;
+ }
+
+ if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
+ memblock_is_map_memory(screen_info.lfb_base))
+ memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
+}
+
+static int __init uefi_init(u64 efi_system_table)
+{
+ efi_config_table_t *config_tables;
+ efi_system_table_t *systab;
+ size_t table_size;
+ int retval;
+
+ systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
+ if (systab == NULL) {
+ pr_warn("Unable to map EFI system table.\n");
+ return -ENOMEM;
+ }
+
+ set_bit(EFI_BOOT, &efi.flags);
+ if (IS_ENABLED(CONFIG_64BIT))
+ set_bit(EFI_64BIT, &efi.flags);
+
+ retval = efi_systab_check_header(&systab->hdr, 2);
+ if (retval)
+ goto out;
+
+ efi.runtime = systab->runtime;
+ efi.runtime_version = systab->hdr.revision;
+
+ efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
+
+ table_size = sizeof(efi_config_table_t) * systab->nr_tables;
+ config_tables = early_memremap_ro(efi_to_phys(systab->tables),
+ table_size);
+ if (config_tables == NULL) {
+ pr_warn("Unable to map EFI config table array.\n");
+ retval = -ENOMEM;
+ goto out;
+ }
+ retval = efi_config_parse_tables(config_tables, systab->nr_tables,
+ IS_ENABLED(CONFIG_ARM) ? arch_tables
+ : NULL);
+
+ early_memunmap(config_tables, table_size);
+out:
+ early_memunmap(systab, sizeof(efi_system_table_t));
+ return retval;
+}
+
+/*
+ * Return true for regions that can be used as System RAM.
+ */
+static __init int is_usable_memory(efi_memory_desc_t *md)
+{
+ switch (md->type) {
+ case EFI_LOADER_CODE:
+ case EFI_LOADER_DATA:
+ case EFI_ACPI_RECLAIM_MEMORY:
+ case EFI_BOOT_SERVICES_CODE:
+ case EFI_BOOT_SERVICES_DATA:
+ case EFI_CONVENTIONAL_MEMORY:
+ case EFI_PERSISTENT_MEMORY:
+ /*
+ * Special purpose memory is 'soft reserved', which means it
+ * is set aside initially, but can be hotplugged back in or
+ * be assigned to the dax driver after boot.
+ */
+ if (efi_soft_reserve_enabled() &&
+ (md->attribute & EFI_MEMORY_SP))
+ return false;
+
+ /*
+ * According to the spec, these regions are no longer reserved
+ * after calling ExitBootServices(). However, we can only use
+ * them as System RAM if they can be mapped writeback cacheable.
+ */
+ return (md->attribute & EFI_MEMORY_WB);
+ default:
+ break;
+ }
+ return false;
+}
+
+static __init void reserve_regions(void)
+{
+ efi_memory_desc_t *md;
+ u64 paddr, npages, size;
+
+ if (efi_enabled(EFI_DBG))
+ pr_info("Processing EFI memory map:\n");
+
+ /*
+ * Discard memblocks discovered so far: if there are any at this
+ * point, they originate from memory nodes in the DT, and UEFI
+ * uses its own memory map instead.
+ */
+ memblock_dump_all();
+ memblock_remove(0, PHYS_ADDR_MAX);
+
+ for_each_efi_memory_desc(md) {
+ paddr = md->phys_addr;
+ npages = md->num_pages;
+
+ if (efi_enabled(EFI_DBG)) {
+ char buf[64];
+
+ pr_info(" 0x%012llx-0x%012llx %s\n",
+ paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
+ efi_md_typeattr_format(buf, sizeof(buf), md));
+ }
+
+ memrange_efi_to_native(&paddr, &npages);
+ size = npages << PAGE_SHIFT;
+
+ if (is_memory(md)) {
+ early_init_dt_add_memory_arch(paddr, size);
+
+ if (!is_usable_memory(md))
+ memblock_mark_nomap(paddr, size);
+
+ /* keep ACPI reclaim memory intact for kexec etc. */
+ if (md->type == EFI_ACPI_RECLAIM_MEMORY)
+ memblock_reserve(paddr, size);
+ }
+ }
+}
+
+void __init efi_init(void)
+{
+ struct efi_memory_map_data data;
+ u64 efi_system_table;
+
+ /* Grab UEFI information placed in FDT by stub */
+ efi_system_table = efi_get_fdt_params(&data);
+ if (!efi_system_table)
+ return;
+
+ if (efi_memmap_init_early(&data) < 0) {
+ /*
+ * If we are booting via UEFI, the UEFI memory map is the only
+ * description of memory we have, so there is little point in
+ * proceeding if we cannot access it.
+ */
+ panic("Unable to map EFI memory map.\n");
+ }
+
+ WARN(efi.memmap.desc_version != 1,
+ "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
+ efi.memmap.desc_version);
+
+ if (uefi_init(efi_system_table) < 0) {
+ efi_memmap_unmap();
+ return;
+ }
+
+ reserve_regions();
+ efi_esrt_init();
+
+ memblock_reserve(data.phys_map & PAGE_MASK,
+ PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
+
+ init_screen_info();
+
+#ifdef CONFIG_ARM
+ /* ARM does not permit early mappings to persist across paging_init() */
+ efi_memmap_unmap();
+
+ if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
+ struct efi_arm_entry_state *state;
+ bool dump_state = true;
+
+ state = early_memremap_ro(cpu_state_table,
+ sizeof(struct efi_arm_entry_state));
+ if (state == NULL) {
+ pr_warn("Unable to map CPU entry state table.\n");
+ return;
+ }
+
+ if ((state->sctlr_before_ebs & 1) == 0)
+ pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
+ else if ((state->sctlr_after_ebs & 1) == 0)
+ pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
+ else
+ dump_state = false;
+
+ if (dump_state || efi_enabled(EFI_DBG)) {
+ pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs);
+ pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs);
+ pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs);
+ pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs);
+ }
+ early_memunmap(state, sizeof(struct efi_arm_entry_state));
+ }
+#endif
+}
+
+static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
+{
+ u64 fb_base = screen_info.lfb_base;
+
+ if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
+ fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
+
+ return fb_base >= range->cpu_addr &&
+ fb_base < (range->cpu_addr + range->size);
+}
+
+static struct device_node *find_pci_overlap_node(void)
+{
+ struct device_node *np;
+
+ for_each_node_by_type(np, "pci") {
+ struct of_pci_range_parser parser;
+ struct of_pci_range range;
+ int err;
+
+ err = of_pci_range_parser_init(&parser, np);
+ if (err) {
+ pr_warn("of_pci_range_parser_init() failed: %d\n", err);
+ continue;
+ }
+
+ for_each_of_pci_range(&parser, &range)
+ if (efifb_overlaps_pci_range(&range))
+ return np;
+ }
+ return NULL;
+}
+
+/*
+ * If the efifb framebuffer is backed by a PCI graphics controller, we have
+ * to ensure that this relation is expressed using a device link when
+ * running in DT mode, or the probe order may be reversed, resulting in a
+ * resource reservation conflict on the memory window that the efifb
+ * framebuffer steals from the PCIe host bridge.
+ */
+static int efifb_add_links(const struct fwnode_handle *fwnode,
+ struct device *dev)
+{
+ struct device_node *sup_np;
+ struct device *sup_dev;
+
+ sup_np = find_pci_overlap_node();
+
+ /*
+ * If there's no PCI graphics controller backing the efifb, we are
+ * done here.
+ */
+ if (!sup_np)
+ return 0;
+
+ sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
+ of_node_put(sup_np);
+
+ /*
+ * Return -ENODEV if the PCI graphics controller device hasn't been
+ * registered yet. This ensures that efifb isn't allowed to probe
+ * and this function is retried again when new devices are
+ * registered.
+ */
+ if (!sup_dev)
+ return -ENODEV;
+
+ /*
+ * If this fails, retrying this function at a later point won't
+ * change anything. So, don't return an error after this.
+ */
+ if (!device_link_add(dev, sup_dev, fw_devlink_get_flags()))
+ dev_warn(dev, "device_link_add() failed\n");
+
+ put_device(sup_dev);
+
+ return 0;
+}
+
+static const struct fwnode_operations efifb_fwnode_ops = {
+ .add_links = efifb_add_links,
+};
+
+static struct fwnode_handle efifb_fwnode = {
+ .ops = &efifb_fwnode_ops,
+};
+
+static int __init register_gop_device(void)
+{
+ struct platform_device *pd;
+ int err;
+
+ if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
+ return 0;
+
+ pd = platform_device_alloc("efi-framebuffer", 0);
+ if (!pd)
+ return -ENOMEM;
+
+ if (IS_ENABLED(CONFIG_PCI))
+ pd->dev.fwnode = &efifb_fwnode;
+
+ err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
+ if (err)
+ return err;
+
+ return platform_device_add(pd);
+}
+subsys_initcall(register_gop_device);
projects / platform / kernel / linux-starfive.git / commitdiff