Add support for Apple's M1 SoC that is used in "Apple Silicon" Macs. This builds a basic U-Boot that can be used as a payload for the m1n1 boot loader being developed by the Asahi Linux project.
Signed-off-by: Mark Kettenis kettenis@openbsd.org --- arch/arm/Kconfig | 22 ++++ arch/arm/Makefile | 1 + arch/arm/mach-apple/Kconfig | 18 ++++ arch/arm/mach-apple/Makefile | 4 + arch/arm/mach-apple/board.c | 158 ++++++++++++++++++++++++++++ arch/arm/mach-apple/lowlevel_init.S | 16 +++ configs/apple_m1_defconfig | 14 +++ include/configs/apple.h | 38 +++++++ 8 files changed, 271 insertions(+) create mode 100644 arch/arm/mach-apple/Kconfig create mode 100644 arch/arm/mach-apple/Makefile create mode 100644 arch/arm/mach-apple/board.c create mode 100644 arch/arm/mach-apple/lowlevel_init.S create mode 100644 configs/apple_m1_defconfig create mode 100644 include/configs/apple.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index b5bd3284cd..7cdea1f615 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -895,6 +895,26 @@ config ARCH_NEXELL select DM select GPIO_EXTRA_HEADER
+config ARCH_APPLE + bool "Apple SoCs" + select ARM64 + select LINUX_KERNEL_IMAGE_HEADER + select POSITION_INDEPENDENT + select BLK + select DM + select DM_KEYBOARD + select DM_SERIAL + select DM_USB + select DM_VIDEO + select CMD_USB + select MISC + select OF_CONTROL + select OF_BOARD + select USB + imply CMD_DM + imply CMD_GPT + imply DISTRO_DEFAULTS + config ARCH_OWL bool "Actions Semi OWL SoCs" select DM @@ -1932,6 +1952,8 @@ config ISW_ENTRY_ADDR image headers. endif
+source "arch/arm/mach-apple/Kconfig" + source "arch/arm/mach-aspeed/Kconfig"
source "arch/arm/mach-at91/Kconfig" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index c68e598a67..44178c204b 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -51,6 +51,7 @@ PLATFORM_CPPFLAGS += $(arch-y) $(tune-y)
# Machine directory name. This list is sorted alphanumerically # by CONFIG_* macro name. +machine-$(CONFIG_ARCH_APPLE) += apple machine-$(CONFIG_ARCH_ASPEED) += aspeed machine-$(CONFIG_ARCH_AT91) += at91 machine-$(CONFIG_ARCH_BCM283X) += bcm283x diff --git a/arch/arm/mach-apple/Kconfig b/arch/arm/mach-apple/Kconfig new file mode 100644 index 0000000000..66cab91b2a --- /dev/null +++ b/arch/arm/mach-apple/Kconfig @@ -0,0 +1,18 @@ +if ARCH_APPLE + +config SYS_TEXT_BASE + default 0x00000000 + +config SYS_CONFIG_NAME + default "apple" + +config SYS_SOC + default "m1" + +config SYS_MALLOC_LEN + default 0x4000000 + +config SYS_MALLOC_F_LEN + default 0x4000 + +endif diff --git a/arch/arm/mach-apple/Makefile b/arch/arm/mach-apple/Makefile new file mode 100644 index 0000000000..e74a8c9df1 --- /dev/null +++ b/arch/arm/mach-apple/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0+ + +obj-y += board.o +obj-y += lowlevel_init.o diff --git a/arch/arm/mach-apple/board.c b/arch/arm/mach-apple/board.c new file mode 100644 index 0000000000..0c8b35292e --- /dev/null +++ b/arch/arm/mach-apple/board.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2021 Mark Kettenis kettenis@openbsd.org + */ + +#include <common.h> +#include <efi_loader.h> + +#include <asm/armv8/mmu.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <asm/system.h> + +DECLARE_GLOBAL_DATA_PTR; + +static struct mm_region apple_mem_map[] = { + { + /* I/O */ + .virt = 0x200000000, + .phys = 0x200000000, + .size = 8UL * SZ_1G, + .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | + PTE_BLOCK_NON_SHARE | + PTE_BLOCK_PXN | PTE_BLOCK_UXN + }, { + /* I/O */ + .virt = 0x500000000, + .phys = 0x500000000, + .size = 2UL * SZ_1G, + .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | + PTE_BLOCK_NON_SHARE | + PTE_BLOCK_PXN | PTE_BLOCK_UXN + }, { + /* I/O */ + .virt = 0x680000000, + .phys = 0x680000000, + .size = SZ_512M, + .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) | + PTE_BLOCK_NON_SHARE | + PTE_BLOCK_PXN | PTE_BLOCK_UXN + }, { + /* PCIE */ + .virt = 0x6a0000000, + .phys = 0x6a0000000, + .size = SZ_512M, + .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRE) | + PTE_BLOCK_INNER_SHARE | + PTE_BLOCK_PXN | PTE_BLOCK_UXN + }, { + /* PCIE */ + .virt = 0x6c0000000, + .phys = 0x6c0000000, + .size = SZ_1G, + .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRE) | + PTE_BLOCK_INNER_SHARE | + PTE_BLOCK_PXN | PTE_BLOCK_UXN + }, { + /* RAM */ + .virt = 0x800000000, + .phys = 0x800000000, + .size = 8UL * SZ_1G, + .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | + PTE_BLOCK_INNER_SHARE + }, { + /* Empty entry for framebuffer */ + 0, + }, { + /* List terminator */ + 0, + } +}; + +struct mm_region *mem_map = apple_mem_map; + +int board_init(void) +{ + return 0; +} + +int dram_init(void) +{ + int index, node, ret; + fdt_addr_t base; + fdt_size_t size; + + ret = fdtdec_setup_mem_size_base(); + if (ret) + return ret; + + /* Update RAM mapping. */ + index = ARRAY_SIZE(apple_mem_map) - 3; + apple_mem_map[index].virt = gd->ram_base; + apple_mem_map[index].phys = gd->ram_base; + apple_mem_map[index].size = gd->ram_size; + + node = fdt_path_offset(gd->fdt_blob, "/chosen/framebuffer"); + if (node < 0) + return 0; + + base = fdtdec_get_addr_size(gd->fdt_blob, node, "reg", &size); + if (base == FDT_ADDR_T_NONE) + return 0; + + /* Add framebuffer mapping. */ + index = ARRAY_SIZE(apple_mem_map) - 2; + apple_mem_map[index].virt = base; + apple_mem_map[index].phys = base; + apple_mem_map[index].size = size; + apple_mem_map[index].attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL_NC) | + PTE_BLOCK_INNER_SHARE | PTE_BLOCK_PXN | PTE_BLOCK_UXN; + + return 0; +} + +int dram_init_banksize(void) +{ + return fdtdec_setup_memory_banksize(); +} + +#define APPLE_WDT_BASE 0x23d2b0000ULL + +#define APPLE_WDT_SYS_CTL_ENABLE BIT(2) + +typedef struct apple_wdt { + u32 reserved0[3]; + u32 chip_ctl; + u32 sys_tmr; + u32 sys_cmp; + u32 reserved1; + u32 sys_ctl; +} apple_wdt_t; + +void reset_cpu(void) +{ + apple_wdt_t *wdt = (apple_wdt_t *)APPLE_WDT_BASE; + + writel(0, &wdt->sys_cmp); + writel(APPLE_WDT_SYS_CTL_ENABLE, &wdt->sys_ctl); + + while(1) + wfi(); +} + +extern long fw_dtb_pointer; + +void *board_fdt_blob_setup(void) +{ + return (void *)fw_dtb_pointer; +} + +ulong board_get_usable_ram_top(ulong total_size) +{ + /* + * Top part of RAM is used by firmware for things like the + * framebuffer. This gives us plenty of room to play with. + */ + return 0x980000000; +} diff --git a/arch/arm/mach-apple/lowlevel_init.S b/arch/arm/mach-apple/lowlevel_init.S new file mode 100644 index 0000000000..0f5313163e --- /dev/null +++ b/arch/arm/mach-apple/lowlevel_init.S @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2021 Mark Kettenis kettenis@openbsd.org + */ + +.align 8 +.global fw_dtb_pointer +fw_dtb_pointer: + .quad 0 + +.global save_boot_params +save_boot_params: + adr x1, fw_dtb_pointer + str x0, [x1] + + b save_boot_params_ret diff --git a/configs/apple_m1_defconfig b/configs/apple_m1_defconfig new file mode 100644 index 0000000000..a7ae15576b --- /dev/null +++ b/configs/apple_m1_defconfig @@ -0,0 +1,14 @@ +CONFIG_ARM=y +CONFIG_ARCH_APPLE=y +# CONFIG_DISPLAY_CPUINFO is not set +# CONFIG_MMC is not set +# CONFIG_NET is not set +CONFIG_VIDEO_SIMPLE=y +CONFIG_DISPLAY_BOARDINFO_LATE=y +CONFIG_USB_XHCI_HCD=y +CONFIG_USB_XHCI_DWC3=y +CONFIG_USB_KEYBOARD=y +CONFIG_USB_STORAGE=y +CONFIG_USE_PREBOOT=y +CONFIG_PREBOOT="usb start" +# CONFIG_GENERATE_SMBIOS_TABLE is not set diff --git a/include/configs/apple.h b/include/configs/apple.h new file mode 100644 index 0000000000..1c246af002 --- /dev/null +++ b/include/configs/apple.h @@ -0,0 +1,38 @@ +#ifndef __CONFIG_H +#define __CONFIG_H + +#include <linux/sizes.h> + +#define CONFIG_SYS_LOAD_ADDR 0x880000000 + +#define CONFIG_SYS_SDRAM_BASE 0x880000000 + +#define CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE CONFIG_SYS_TEXT_BASE + +/* Environment */ +#define ENV_DEVICE_SETTINGS \ + "stdin=serial,usbkbd\0" \ + "stdout=serial,vidconsole\0" \ + "stderr=serial,vidconsole\0" + +#define ENV_MEM_LAYOUT_SETTINGS \ + "fdt_addr_r=0x960100000\0" \ + "kernel_addr_r=0x960200000\0" + +#if CONFIG_IS_ENABLED(CMD_USB) + #define BOOT_TARGET_USB(func) func(USB, usb, 0) +#else + #define BOOT_TARGET_USB(func) +#endif + +#define BOOT_TARGET_DEVICES(func) \ + BOOT_TARGET_USB(func) + +#include <config_distro_bootcmd.h> + +#define CONFIG_EXTRA_ENV_SETTINGS \ + ENV_DEVICE_SETTINGS \ + ENV_MEM_LAYOUT_SETTINGS \ + BOOTENV + +#endif