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LoongArch: Add boot and setup routines
Add basic boot, setup and reset routines for LoongArch. Now, LoongArch machines use UEFI-based firmware. The firmware passes configuration information to the kernel via ACPI and DMI/SMBIOS. Currently an existing interface between the kernel and the bootloader is implemented. Kernel gets 2 values from the bootloader, passed in registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and non-UEFI firmware, while a1 is a pointer to an FDT with systable, memmap, cmdline and initrd information. The standard UEFI boot protocol (EFISTUB) will be added later. Cc: [email protected] Cc: Ard Biesheuvel <[email protected]> Reviewed-by: WANG Xuerui <[email protected]> Reviewed-by: Jiaxun Yang <[email protected]> Co-developed-by: Yun Liu <[email protected]> Signed-off-by: Yun Liu <[email protected]> Signed-off-by: Huacai Chen <[email protected]>
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‎arch/loongarch/include/asm/acenv.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* LoongArch specific ACPICA environments and implementation
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*
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* Author: Jianmin Lv <[email protected]>
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* Huacai Chen <[email protected]>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_LOONGARCH_ACENV_H
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#define _ASM_LOONGARCH_ACENV_H
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/*
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* This header is required by ACPI core, but we have nothing to fill in
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* right now. Will be updated later when needed.
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*/
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#endif /* _ASM_LOONGARCH_ACENV_H */

‎arch/loongarch/include/asm/acpi.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Jianmin Lv <[email protected]>
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* Huacai Chen <[email protected]>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_LOONGARCH_ACPI_H
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#define _ASM_LOONGARCH_ACPI_H
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#ifdef CONFIG_ACPI
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extern int acpi_strict;
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extern int acpi_disabled;
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extern int acpi_pci_disabled;
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extern int acpi_noirq;
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#define acpi_os_ioremap acpi_os_ioremap
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void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
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static inline void disable_acpi(void)
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{
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acpi_disabled = 1;
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acpi_pci_disabled = 1;
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acpi_noirq = 1;
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}
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static inline bool acpi_has_cpu_in_madt(void)
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{
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return true;
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}
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extern struct list_head acpi_wakeup_device_list;
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#endif /* !CONFIG_ACPI */
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#define ACPI_TABLE_UPGRADE_MAX_PHYS ARCH_LOW_ADDRESS_LIMIT
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#endif /* _ASM_LOONGARCH_ACPI_H */

‎arch/loongarch/include/asm/bootinfo.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_BOOTINFO_H
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#define _ASM_BOOTINFO_H
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#include <linux/types.h>
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#include <asm/setup.h>
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const char *get_system_type(void);
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extern void init_environ(void);
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extern void memblock_init(void);
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extern void platform_init(void);
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struct loongson_board_info {
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int bios_size;
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const char *bios_vendor;
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const char *bios_version;
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const char *bios_release_date;
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const char *board_name;
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const char *board_vendor;
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};
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struct loongson_system_configuration {
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int nr_cpus;
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int nr_nodes;
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int nr_io_pics;
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int boot_cpu_id;
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int cores_per_node;
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int cores_per_package;
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const char *cpuname;
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};
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extern u64 efi_system_table;
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extern unsigned long fw_arg0, fw_arg1;
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extern struct loongson_board_info b_info;
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extern struct loongson_system_configuration loongson_sysconf;
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#endif /* _ASM_BOOTINFO_H */

‎arch/loongarch/include/asm/dmi.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_DMI_H
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#define _ASM_DMI_H
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#include <linux/io.h>
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#include <linux/memblock.h>
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#define dmi_early_remap(x, l) dmi_remap(x, l)
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#define dmi_early_unmap(x, l) dmi_unmap(x)
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#define dmi_alloc(l) memblock_alloc(l, PAGE_SIZE)
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static inline void *dmi_remap(u64 phys_addr, unsigned long size)
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{
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return ((void *)TO_CACHE(phys_addr));
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}
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static inline void dmi_unmap(void *addr)
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{
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}
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#endif /* _ASM_DMI_H */

‎arch/loongarch/include/asm/efi.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_LOONGARCH_EFI_H
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#define _ASM_LOONGARCH_EFI_H
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#include <linux/efi.h>
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void __init efi_init(void);
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void __init efi_runtime_init(void);
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void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
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#define ARCH_EFI_IRQ_FLAGS_MASK 0x00000004 /* Bit 2: CSR.CRMD.IE */
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#define arch_efi_call_virt_setup() \
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({ \
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})
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#define arch_efi_call_virt(p, f, args...) \
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({ \
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efi_##f##_t * __f; \
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__f = p->f; \
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__f(args); \
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})
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#define arch_efi_call_virt_teardown() \
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({ \
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})
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#define EFI_ALLOC_ALIGN SZ_64K
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struct screen_info *alloc_screen_info(void);
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void free_screen_info(struct screen_info *si);
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static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
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{
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return ULONG_MAX;
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}
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#endif /* _ASM_LOONGARCH_EFI_H */

‎arch/loongarch/include/asm/reboot.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_REBOOT_H
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#define _ASM_REBOOT_H
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extern void (*pm_restart)(void);
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#endif /* _ASM_REBOOT_H */

‎arch/loongarch/include/asm/setup.h

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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _LOONGARCH_SETUP_H
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#define _LOONGARCH_SETUP_H
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#include <linux/types.h>
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#include <uapi/asm/setup.h>
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#define VECSIZE 0x200
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extern unsigned long eentry;
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extern unsigned long tlbrentry;
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extern void cpu_cache_init(void);
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extern void per_cpu_trap_init(int cpu);
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extern void set_handler(unsigned long offset, void *addr, unsigned long len);
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extern void set_merr_handler(unsigned long offset, void *addr, unsigned long len);
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#endif /* __SETUP_H */

‎arch/loongarch/kernel/acpi.c

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// SPDX-License-Identifier: GPL-2.0
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/*
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* acpi.c - Architecture-Specific Low-Level ACPI Boot Support
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*
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* Author: Jianmin Lv <[email protected]>
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* Huacai Chen <[email protected]>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/memblock.h>
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#include <linux/serial_core.h>
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#include <asm/io.h>
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#include <asm/loongson.h>
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int acpi_disabled;
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EXPORT_SYMBOL(acpi_disabled);
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int acpi_noirq;
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int acpi_pci_disabled;
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EXPORT_SYMBOL(acpi_pci_disabled);
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int acpi_strict = 1; /* We have no workarounds on LoongArch */
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int num_processors;
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int disabled_cpus;
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enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
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u64 acpi_saved_sp;
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#define MAX_CORE_PIC 256
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#define PREFIX "ACPI: "
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int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
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{
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if (irqp != NULL)
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*irqp = acpi_register_gsi(NULL, gsi, -1, -1);
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return (*irqp >= 0) ? 0 : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
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int acpi_isa_irq_to_gsi(unsigned int isa_irq, u32 *gsi)
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{
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if (gsi)
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*gsi = isa_irq;
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return 0;
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}
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/*
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* success: return IRQ number (>=0)
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* failure: return < 0
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*/
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int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
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{
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struct irq_fwspec fwspec;
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switch (gsi) {
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case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ:
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fwspec.fwnode = liointc_domain->fwnode;
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fwspec.param[0] = gsi - GSI_MIN_CPU_IRQ;
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fwspec.param_count = 1;
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return irq_create_fwspec_mapping(&fwspec);
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case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ:
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if (!pch_lpc_domain)
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return -EINVAL;
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fwspec.fwnode = pch_lpc_domain->fwnode;
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fwspec.param[0] = gsi - GSI_MIN_LPC_IRQ;
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fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
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fwspec.param_count = 2;
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return irq_create_fwspec_mapping(&fwspec);
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case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ:
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if (!pch_pic_domain[0])
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return -EINVAL;
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fwspec.fwnode = pch_pic_domain[0]->fwnode;
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fwspec.param[0] = gsi - GSI_MIN_PCH_IRQ;
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fwspec.param[1] = IRQ_TYPE_LEVEL_HIGH;
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fwspec.param_count = 2;
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return irq_create_fwspec_mapping(&fwspec);
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_register_gsi);
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void acpi_unregister_gsi(u32 gsi)
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{
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}
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EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
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void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size)
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{
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if (!phys || !size)
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return NULL;
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return early_memremap(phys, size);
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}
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void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
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{
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if (!map || !size)
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return;
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early_memunmap(map, size);
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}
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void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
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{
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if (!memblock_is_memory(phys))
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return ioremap(phys, size);
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else
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return ioremap_cache(phys, size);
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}
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void __init acpi_boot_table_init(void)
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{
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/*
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* If acpi_disabled, bail out
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*/
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if (acpi_disabled)
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return;
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/*
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* Initialize the ACPI boot-time table parser.
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*/
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if (acpi_table_init()) {
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disable_acpi();
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return;
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}
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}
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static void __init acpi_process_madt(void)
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{
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loongson_sysconf.nr_cpus = num_processors;
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}
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int __init acpi_boot_init(void)
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{
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/*
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* If acpi_disabled, bail out
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*/
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if (acpi_disabled)
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return -1;
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loongson_sysconf.boot_cpu_id = read_csr_cpuid();
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/*
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* Process the Multiple APIC Description Table (MADT), if present
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*/
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acpi_process_madt();
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/* Do not enable ACPI SPCR console by default */
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acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
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return 0;
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}
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void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
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{
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memblock_reserve(addr, size);
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}

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