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    Subject[PATCH 03/12] powerpc: wiiu: bootwrapper support
    Date
    Add support for the Nintendo Wii U game console to the powerpc
    bootwrapper.

    Signed-off-by: Ash Logan <ash@heyquark.com>
    Co-developed-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
    Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
    ---
    arch/powerpc/boot/Makefile | 4 ++
    arch/powerpc/boot/wiiu-head.S | 103 ++++++++++++++++++++++++++++++++++
    arch/powerpc/boot/wiiu.c | 73 ++++++++++++++++++++++++
    arch/powerpc/boot/wrapper | 4 ++
    4 files changed, 184 insertions(+)
    create mode 100644 arch/powerpc/boot/wiiu-head.S
    create mode 100644 arch/powerpc/boot/wiiu.c

    diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
    index 9993c6256ad2..4e31bb648f4d 100644
    --- a/arch/powerpc/boot/Makefile
    +++ b/arch/powerpc/boot/Makefile
    @@ -155,6 +155,7 @@ src-plat-$(CONFIG_EMBEDDED6xx) += cuboot-pq2.c cuboot-mpc7448hpc2.c \
    gamecube-head.S gamecube.c \
    wii-head.S wii.c holly.c \
    fixed-head.S mvme5100.c
    +src-plat-$(CONFIG_WIIU) += wiiu-head.S wiiu.c
    src-plat-$(CONFIG_AMIGAONE) += cuboot-amigaone.c
    src-plat-$(CONFIG_PPC_PS3) += ps3-head.S ps3-hvcall.S ps3.c
    src-plat-$(CONFIG_EPAPR_BOOT) += epapr.c epapr-wrapper.c
    @@ -353,6 +354,9 @@ image-$(CONFIG_GAMECUBE) += dtbImage.gamecube
    image-$(CONFIG_WII) += dtbImage.wii
    image-$(CONFIG_MVME5100) += dtbImage.mvme5100

    +# Board port in arch/powerpc/platform/wiiu/Kconfig
    +image-$(CONFIG_WIIU) += dtbImage.wiiu
    +
    # Board port in arch/powerpc/platform/amigaone/Kconfig
    image-$(CONFIG_AMIGAONE) += cuImage.amigaone

    diff --git a/arch/powerpc/boot/wiiu-head.S b/arch/powerpc/boot/wiiu-head.S
    new file mode 100644
    index 000000000000..8586e2e992d5
    --- /dev/null
    +++ b/arch/powerpc/boot/wiiu-head.S
    @@ -0,0 +1,103 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/*
    + * Entrypoint head asm
    + * This code expects to be called directly after the Espresso BootROM, which implies certain MSR
    + * states.
    + *
    + * Nintendo Wii U bootwrapper support
    + * Copyright (C) 2022 The linux-wiiu Team
    + */
    +
    +#include "ppc_asm.h"
    +
    +.text
    +.global _zimage_start
    +_zimage_start:
    + /* Clear out all BATs. MMU is already off. */
    + li r8, 0
    +
    + mtspr 0x210, r8 /* IBAT0U */
    + mtspr 0x212, r8 /* IBAT1U */
    + mtspr 0x214, r8 /* IBAT2U */
    + mtspr 0x216, r8 /* IBAT3U */
    + mtspr 0x218, r8 /* DBAT0U */
    + mtspr 0x21a, r8 /* DBAT1U */
    + mtspr 0x21c, r8 /* DBAT2U */
    + mtspr 0x21e, r8 /* DBAT3U */
    +
    + mtspr 0x230, r8 /* IBAT4U */
    + mtspr 0x232, r8 /* IBAT5U */
    + mtspr 0x234, r8 /* IBAT6U */
    + mtspr 0x236, r8 /* IBAT7U */
    + mtspr 0x238, r8 /* DBAT4U */
    + mtspr 0x23a, r8 /* DBAT5U */
    + mtspr 0x23c, r8 /* DBAT6U */
    + mtspr 0x23e, r8 /* DBAT7U */
    +
    + /* MEM1 */
    + /* 32MB, starting at 0x00000000... */
    + li r8, 0x000003ff@l
    + mtspr 0x21a, r8 /* DBAT1U */
    + mtspr 0x212, r8 /* IBAT1U */
    +
    + /* mapped into phys 0x00000000; read-write; normal caching. */
    + li r8, 0x00000002@l
    + mtspr 0x21b, r8 /* DBAT1L */
    + mtspr 0x213, r8 /* IBAT1L */
    +
    + /* Latte MMIO area */
    + /* 64MB, starting at 0x0d800000... */
    + lis r8, 0x0d8007ff@h
    + ori r8, r8,0x0d800007ff@l
    + mtspr 0x21c, r8 /* DBAT2U */
    +
    + /* mapped into phys 0x0d800000; read-write; writethrough/nocache/guard*/
    + lis r8, 0x0d80006A@h
    + ori r8, r8,0x0d80006A@l
    + mtspr 0x21d, r8 /* DBAT2L */
    +
    + /* Bootloader comms area (actually 0x89200000) */
    + /* 128MiB, starting at 0x88000000... */
    + lis r8, 0x88000fff@h
    + ori r8, r8, 0x88000fff@l
    + mtspr 0x21e, r8 /* DBAT3U */
    +
    + /* mapped into phys 0x88000000; read-write; normal caching. */
    + lis r8, 0x88000002@h
    + ori r8, r8, 0x88000002@l
    + mtspr 0x21f, r8 /* DBAT3L */
    +
    + /* Turn on BAT 4 through 7, configure CPU */
    + mfspr r8, 0x3f3 /* HID4 */
    + oris r8, r8, 0x3200 /* L2FM: 64-byte fetch, BPD: max depth is 4, SBE */
    + mtspr 0x3f3, r8
    +
    + /* Turn on and invalidate caches */
    + mfspr r8, 0x3f0 /* HID0 */
    + /* HID0_ICE | HID0_ICFI | HID0_DCE | HID0_DCFI */
    + ori r8, r8, (1 << 15) | (1 << 11) | (1 << 14) | (1 << 10)
    + mtspr 0x3f0, r8
    + isync
    +
    + li r3, 0
    + li r4, 0
    + li r5, 0
    +
    + bl get_lr
    +get_lr:
    + mflr r8
    + /* Get absolute address of done */
    + addi r8, r8, done - get_lr
    +
    + /* Set up MSR */
    + /* MSR_DR | MSR_IR | MSR_FP */
    + /* Data/instruction MMUs, FPU because why not */
    + ori r9, r3, (1 << 4) | (1 << 5) | (1 << 13)
    +
    + /* Apply our new MSR, starting execution at "done" */
    + mtsrr0 r8
    + mtsrr1 r9
    + sync
    + rfi
    +done:
    + b _zimage_start_lib
    diff --git a/arch/powerpc/boot/wiiu.c b/arch/powerpc/boot/wiiu.c
    new file mode 100644
    index 000000000000..fe88eb2c42ae
    --- /dev/null
    +++ b/arch/powerpc/boot/wiiu.c
    @@ -0,0 +1,73 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Platform support and IPC debug console to linux-loader (on Starbuck)
    + *
    + * Nintendo Wii U bootwrapper support
    + * Copyright (C) 2022 The linux-wiiu Team
    + */
    +
    +#include <stddef.h>
    +#include "string.h"
    +#include "stdio.h"
    +#include "types.h"
    +#include "io.h"
    +#include "ops.h"
    +
    +BSS_STACK(8192);
    +
    +// Volatile is used here since the io.h routines require it
    +#define LT_IPC_PPCMSG ((volatile u32 *)0x0d800000)
    +#define LT_IPC_PPCCTRL ((volatile u32 *)0x0d800004)
    +#define LT_IPC_PPCCTRL_X1 0x1
    +
    +#define WIIU_LOADER_CMD_PRINT 0x01000000
    +
    +static void wiiu_ipc_sendmsg(int msg)
    +{
    + out_be32(LT_IPC_PPCMSG, msg);
    + out_be32(LT_IPC_PPCCTRL, LT_IPC_PPCCTRL_X1);
    + while (in_be32(LT_IPC_PPCCTRL) & LT_IPC_PPCCTRL_X1)
    + barrier();
    +}
    +
    +/*
    + * Send logging string out over IPC to linux-loader for early printing.
    + * Packs 3 chars at a time where possible.
    + */
    +static void wiiu_write_ipc(const char *buf, int len)
    +{
    + int i = 0;
    +
    + for (i = 0; i + 2 < len; i += 3) {
    + int msg = WIIU_LOADER_CMD_PRINT | (buf[i + 0] << 16) |
    + (buf[i + 1] << 8) | buf[i + 2];
    +
    + wiiu_ipc_sendmsg(msg);
    + }
    +
    + if (i < len) {
    + for (; i < len; i++) {
    + int msg = WIIU_LOADER_CMD_PRINT | (buf[i] << 16);
    +
    + wiiu_ipc_sendmsg(msg);
    + }
    + }
    +}
    +
    +/*
    + * Note 32MiB heap - not ideal but seems fine for the bootwrapper
    + */
    +void platform_init(unsigned int r3, unsigned int r4, unsigned int r5)
    +{
    + u32 heapsize;
    +
    + console_ops.write = wiiu_write_ipc;
    + printf("wiiu: bootwrapper ok\n");
    +
    + heapsize = 32 * 1024 * 1024 - (u32)_end;
    + simple_alloc_init(_end, heapsize, 32, 64);
    + printf("wiiu: heap ok\n");
    +
    + fdt_init(_dtb_start);
    + printf("wiiu: dtb ok\n");
    +}
    diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
    index 9184eda780fd..f42abe4ebde2 100755
    --- a/arch/powerpc/boot/wrapper
    +++ b/arch/powerpc/boot/wrapper
    @@ -344,6 +344,10 @@ gamecube|wii)
    link_address='0x600000'
    platformo="$object/$platform-head.o $object/$platform.o"
    ;;
    +wiiu)
    + link_address='0x600000'
    + platformo="$object/wiiu-head.o $object/$platform.o"
    + ;;
    microwatt)
    link_address='0x500000'
    platformo="$object/fixed-head.o $object/$platform.o"
    --
    2.35.1
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