mpc85xx: add support for Watchguard Firebox T10

Hardware
--------
SoC:    Freescale P1010
RAM:    512MB
FLASH:  1 MB SPI-NOR
        512 MB NAND
ETH:    3x Gigabite Ethernet (Atheros AR8033)
SERIAL: Cisco RJ-45 (115200 8N1)
RTC:    Battery-Backed RTC (I2C)

Installation
------------

1. Patch U-Boot by dumping the content of the SPI-Flash using a SPI
   programmer. The SHA1 hash for the U-Boot password is currently
   unknown.

   A tool for patching U-Boot is available at
   https://github.com/blocktrron/t10-uboot-patcher/

   You can also patch the unknown password yourself. The SHA1 hash is
   E597301A1D89FF3F6D318DBF4DBA0A5ABC5ECBEA

2. Interrupt the bootmenu by pressing CTRL+C. A password prompt appears.
   The patched password is '1234' (without quotation marks)

3. Download the OpenWrt initramfs image. Copy it to a TFTP server
   reachable at 10.0.1.13/24 and rename it to uImage.

4. Connect the TFTP server to ethernet port 0 of the Watchguard T10.

5. Download and boot the initramfs image by entering "tftpboot; bootm;"
   in U-Boot.

6. After OpenWrt booted, create a UBI volume on the old data partition.
   The "ubi" mtd partition should be mtd7, check this using

   $ cat /proc/mtd

   Create a UBI partition by executing

   $ ubiformat /dev/mtd7 -y

7. Increase the loadable kernel-size of U-Boot by executing

   $ fw_setenv SysAKernSize 800000

8. Transfer the OpenWrt sysupgrade image to the Watchguard T10 using
   scp. Install the image by using sysupgrade:

   $ sysupgrade -n <path-to-sysupgrade>

   Note: The LAN ports of the T10 are 1 & 2 while 0 is WAN. You might
   have to change the ethernet-port.

9. OpenWrt should now boot from the internal NAND. Enjoy.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/mpc85xx/files/arch/powerpc/platforms/85xx/firebox_t10.c

@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * Watchguard Firebox T10 Board Setup
+ *
+ * Copyright (C) 2023 David Bauer <mail@david-bauer.net>
+ *
+ * Based on:
+ *   p1010rdb.c:
+ *      P1010 RDB Board Setup
+ *      Copyright 2011 Freescale Semiconductor Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+
+#include <asm/time.h>
+#include <asm/machdep.h>
+#include <asm/pci-bridge.h>
+#include <mm/mmu_decl.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+#include <asm/mpic.h>
+
+#include <sysdev/fsl_soc.h>
+#include <sysdev/fsl_pci.h>
+
+#include "mpc85xx.h"
+
+void __init firebox_t10_pic_init(void)
+{
+	struct mpic *mpic;
+
+	mpic = mpic_alloc(NULL, 0,
+	  MPIC_BIG_ENDIAN | MPIC_SINGLE_DEST_CPU,
+	  0, 256, " OpenPIC  ");
+
+	BUG_ON(mpic == NULL);
+	mpic_init(mpic);
+}
+
+/*
+ * Setup the architecture
+ */
+static void __init firebox_t10_setup_arch(void)
+{
+	if (ppc_md.progress)
+		ppc_md.progress("firebox_t10_setup_arch()", 0);
+
+	fsl_pci_assign_primary();
+
+	pr_info("Firebox T10 from Watchguard\n");
+}
+
+machine_arch_initcall(firebox_t10, mpc85xx_common_publish_devices);
+
+/*
+ * Called very early, device-tree isn't unflattened
+ */
+static int __init firebox_t10_probe(void)
+{
+	if (of_machine_is_compatible("watchguard,firebox-t10"))
+		return 1;
+	return 0;
+}
+
+define_machine(firebox_t10) {
+	.name			= "P1010 RDB",
+	.probe			= firebox_t10_probe,
+	.setup_arch		= firebox_t10_setup_arch,
+	.init_IRQ		= firebox_t10_pic_init,
+#ifdef CONFIG_PCI
+	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
+	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
+#endif
+	.get_irq		= mpic_get_irq,
+	.calibrate_decr		= generic_calibrate_decr,
+	.progress		= udbg_progress,
+};