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From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: Bin Meng <bmeng.cn@gmail.com>
Cc: kettenis@openbsd.org, u-boot@lists.denx.de,
	bharat.gooty@broadcom.com, rayagonda.kokatanur@broadcom.com,
	oliver.graute@kococonnector.com, bin.meng@windriver.com,
	ycliang@andestech.com, tianrui-wei@outlook.com,
	stephan@gerhold.net, padmarao.begari@microchip.com,
	kishon@ti.com, xypron.glpk@gmx.de, michael@walle.cc,
	masami.hiramatsu@linaro.org, sjg@chromium.org, ashe@kivikakk.ee,
	wasim.khan@nxp.com, michal.simek@xilinx.com,
	igor.opaniuk@foundries.io, hs@denx.de, ye.li@nxp.com, sr@denx.de,
	vabhav.sharma@nxp.com, marek.behun@nic.cz,
	weijie.gao@mediatek.com, takahiro.akashi@linaro.org,
	andriy.shevchenko@linux.intel.com, p.yadav@ti.com
Subject: Re: [PATCH 1/5] arm: apple: Add initial support for Apple's M1 SoC
Date: Sun, 19 Sep 2021 22:05:08 +0200 (CEST)	[thread overview]
Message-ID: <56146b7d2e098c7c@bloch.sibelius.xs4all.nl> (raw)
In-Reply-To: <CAEUhbmXUp==wfXPNdG4StRZrhtrdGp6_i1uqRR6jS8EDoCb7gQ@mail.gmail.com> (message from Bin Meng on Sun, 19 Sep 2021 09:04:56 +0800)

> From: Bin Meng <bmeng.cn@gmail.com>
> Date: Sun, 19 Sep 2021 09:04:56 +0800

Hi Bin,

Thanks for taking a look.

> Hi Mark,
> 
> On Sat, Sep 18, 2021 at 9:55 PM Mark Kettenis <kettenis@openbsd.org> wrote:
> >
> > 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. */
> 
> nits: please remove the ending .

Really?  The current codebase has both styles...  But sure, I can make
that change.

> > +       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. */
> 
> ditto
> 
> > +       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)
> 
> This looks like we should add a new sysreset driver for Apple Arm SoC.

Could be.  This is actually a watchdog device that is used to reset
the machine.  So I suppose I should add a watchdog driver and use
SYSRESET_WATCHDOG.  Slight worry is that this relies on a lot more DM
code.  Does that mean the reset isn't available during early boot?

If it is acceptable, I would like to add the watchdog device in a
future series, once the device tree bindings for the watchdog have
been hammered out.

> > +{
> > +       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
> 
> Is this filled in by m1n1?
> 
> > +
> > +.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
> 
> Regards,
> Bin
> 

  parent reply	other threads:[~2021-09-19 20:05 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-18 13:54 [PATCH 0/5] Apple M1 Support Mark Kettenis
2021-09-18 13:54 ` [PATCH 1/5] arm: apple: Add initial support for Apple's M1 SoC Mark Kettenis
2021-09-19  1:04   ` Bin Meng
2021-09-19  1:17     ` Bin Meng
2021-09-19 20:33       ` Mark Kettenis
2021-09-21 12:42         ` Tom Rini
2021-09-21 15:53           ` Bin Meng
2021-09-21 16:04             ` Tom Rini
2021-09-21 16:08             ` Mark Kettenis
2021-09-25 13:27               ` Simon Glass
2021-09-19 20:05     ` Mark Kettenis [this message]
2021-09-20  3:15   ` Simon Glass
2021-09-20  8:49     ` Mark Kettenis
2021-09-21  1:11       ` Simon Glass
2021-09-18 13:54 ` [PATCH 2/5] serial: s5p: Add Apple M1 support Mark Kettenis
2021-09-19  1:11   ` Bin Meng
2021-09-19 20:30     ` Mark Kettenis
2021-09-20  3:15   ` Simon Glass
2021-09-25 13:27     ` Simon Glass
2021-10-02 22:15     ` Mark Kettenis
2021-10-03  2:01       ` Simon Glass
2021-09-18 13:54 ` [PATCH 3/5] misc: Add Apple DART driver Mark Kettenis
2021-09-20  3:16   ` Simon Glass
2021-09-20  8:33     ` Mark Kettenis
2021-09-21  1:11       ` Simon Glass
2021-09-25 13:27         ` Simon Glass
2021-09-26 20:53         ` Mark Kettenis
2021-09-27 20:14           ` Simon Glass
2021-09-18 13:54 ` [PATCH 4/5] arm: dts: apple: Add preliminary device trees Mark Kettenis
2021-09-20  3:16   ` Simon Glass
2021-09-25 13:27     ` Simon Glass
2021-09-18 13:54 ` [PATCH 5/5] doc: board: apple: Add Apple M1 documentation Mark Kettenis
2021-09-19  1:22   ` Bin Meng
2021-09-20  3:16   ` Simon Glass
2021-09-25 13:27     ` Simon Glass
2021-09-20  8:45   ` Igor Opaniuk
2021-09-25  1:20 ` [PATCH 0/5] Apple M1 Support Simon Glass
2021-09-25  8:11   ` Mark Kettenis
2021-09-25 13:27     ` Simon Glass
2021-09-25 13:52       ` Mark Kettenis
2021-09-25 14:42         ` Simon Glass
2021-09-25 16:45           ` Mark Kettenis
2021-09-26 15:53             ` Simon Glass
2021-09-28  3:46               ` Simon Glass
2021-09-28  7:36                 ` Mark Kettenis
2021-09-28 12:07                   ` Simon Glass

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