board: arm: Add support for Broadcom BCM7445

Add support for loading U-Boot on the Broadcom 7445 SoC.  This port
assumes Broadcom's BOLT bootloader is acting as the second stage
bootloader, and U-Boot is acting as the third stage bootloader, loaded
as an ELF program by BOLT.

Signed-off-by: Thomas Fitzsimmons <fitzsim@fitzsim.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>

3 files changed, 209 insertions, 0 deletions

diff --git a/board/broadcom/bcmstb/MAINTAINERS b/board/broadcom/bcmstb/MAINTAINERS
new file mode 100644
index 0000000000..5851cb9978
--- /dev/null
+++ b/board/broadcom/bcmstb/MAINTAINERS
@@ -0,0 +1,7 @@
+BCM7445 BOARD
+M:	Thomas Fitzsimmons <fitzsim@fitzsim.org>
+S:	Maintained
+F:	board/broadcom/bcmstb/
+F:	include/configs/bcmstb.h
+F:	include/configs/bcm7445.h
+F:	configs/bcm7445_defconfig
diff --git a/board/broadcom/bcmstb/Makefile b/board/broadcom/bcmstb/Makefile
new file mode 100644
index 0000000000..9609887760
--- /dev/null
+++ b/board/broadcom/bcmstb/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2018  Cisco Systems, Inc.
+#
+# Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
+#
+
+obj-y	:= bcmstb.o
diff --git a/board/broadcom/bcmstb/bcmstb.c b/board/broadcom/bcmstb/bcmstb.c
new file mode 100644
index 0000000000..25cd354998
--- /dev/null
+++ b/board/broadcom/bcmstb/bcmstb.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018  Cisco Systems, Inc.
+ *
+ * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
+ */
+
+#include <linux/types.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/bootm.h>
+#include <mach/sdhci.h>
+#include <mach/timer.h>
+#include <mmc.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define BCMSTB_DATA_SECTION __attribute__((section(".data")))
+
+struct bcmstb_boot_parameters bcmstb_boot_parameters BCMSTB_DATA_SECTION;
+
+phys_addr_t prior_stage_fdt_address BCMSTB_DATA_SECTION;
+
+union reg_value_union {
+	const char *data;
+	const phys_addr_t *address;
+};
+
+int board_init(void)
+{
+	return 0;
+}
+
+u32 get_board_rev(void)
+{
+	return 0;
+}
+
+void reset_cpu(ulong ignored)
+{
+}
+
+int print_cpuinfo(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	if (fdtdec_setup_memory_size() != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	fdtdec_setup_memory_banksize();
+
+	/*
+	 * On this SoC, U-Boot is running as an ELF file.  Change the
+	 * relocation address to CONFIG_SYS_TEXT_BASE, so that in
+	 * setup_reloc, gd->reloc_off works out to 0, effectively
+	 * disabling relocation.  Otherwise U-Boot hangs in the setup
+	 * instructions just before relocate_code in
+	 * arch/arm/lib/crt0.S.
+	 */
+	gd->relocaddr = CONFIG_SYS_TEXT_BASE;
+
+	return 0;
+}
+
+void enable_caches(void)
+{
+	/*
+	 * This port assumes that the prior stage bootloader has
+	 * enabled I-cache and D-cache already.  Implementing this
+	 * function silences the warning in the default function.
+	 */
+}
+
+static const phys_addr_t bcmstb_sdhci_address(u32 alias_index)
+{
+	int node = 0;
+	int ret = 0;
+	char sdhci[16] = { 0 };
+	const void *fdt = gd->fdt_blob;
+	const char *path = NULL;
+	struct fdt_resource resource = { 0 };
+
+	if (!fdt) {
+		printf("%s: Invalid gd->fdt_blob\n", __func__);
+		return 0;
+	}
+
+	node = fdt_path_offset(fdt, "/aliases");
+	if (node < 0) {
+		printf("%s: Failed to find /aliases node\n", __func__);
+		return 0;
+	}
+
+	sprintf(sdhci, "sdhci%d", alias_index);
+	path = fdt_getprop(fdt, node, sdhci, NULL);
+	if (!path) {
+		printf("%s: Failed to find alias for %s\n", __func__, sdhci);
+		return 0;
+	}
+
+	node = fdt_path_offset(fdt, path);
+	if (node < 0) {
+		printf("%s: Failed to resolve BCMSTB SDHCI alias\n", __func__);
+		return 0;
+	}
+
+	ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+				     "host", &resource);
+	if (ret) {
+		printf("%s: Failed to read BCMSTB SDHCI host resource\n",
+		       __func__);
+		return 0;
+	}
+
+	return resource.start;
+}
+
+int board_mmc_init(bd_t *bis)
+{
+	phys_addr_t sdhci_base_address = 0;
+
+	sdhci_base_address = bcmstb_sdhci_address(CONFIG_BCMSTB_SDHCI_INDEX);
+
+	if (!sdhci_base_address) {
+		sdhci_base_address = BCMSTB_SDHCI_BASE;
+		printf("%s: Assuming BCMSTB SDHCI address: 0x%p\n",
+		       __func__, (void *)sdhci_base_address);
+	}
+
+	debug("BCMSTB SDHCI base address: 0x%p\n", (void *)sdhci_base_address);
+
+	bcmstb_sdhci_init(sdhci_base_address);
+
+	return 0;
+}
+
+int timer_init(void)
+{
+	gd->arch.timer_rate_hz = readl(BCMSTB_TIMER_FREQUENCY);
+
+	return 0;
+}
+
+ulong get_tbclk(void)
+{
+	return gd->arch.timer_rate_hz;
+}
+
+uint64_t get_ticks(void)
+{
+	gd->timebase_h = readl(BCMSTB_TIMER_HIGH);
+	gd->timebase_l = readl(BCMSTB_TIMER_LOW);
+
+	return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
+}
+
+int board_late_init(void)
+{
+	debug("Arguments from prior stage bootloader:\n");
+	debug("General Purpose Register 0: 0x%x\n", bcmstb_boot_parameters.r0);
+	debug("General Purpose Register 1: 0x%x\n", bcmstb_boot_parameters.r1);
+	debug("General Purpose Register 2: 0x%x\n", bcmstb_boot_parameters.r2);
+	debug("General Purpose Register 3: 0x%x\n", bcmstb_boot_parameters.r3);
+	debug("Stack Pointer Register:     0x%x\n", bcmstb_boot_parameters.sp);
+	debug("Link Register:              0x%x\n", bcmstb_boot_parameters.lr);
+	debug("Assuming timer frequency register at: 0x%p\n",
+	      (void *)BCMSTB_TIMER_FREQUENCY);
+	debug("Read timer frequency (in Hz): %ld\n", gd->arch.timer_rate_hz);
+	debug("Prior stage provided DTB at: 0x%p\n",
+	      (void *)prior_stage_fdt_address);
+
+	/*
+	 * Set fdtcontroladdr in the environment so that scripts can
+	 * refer to it, for example, to reuse it for fdtaddr.
+	 */
+	env_set_hex("fdtcontroladdr", prior_stage_fdt_address);
+
+	/*
+	 * Do not set machid to the machine identifier value provided
+	 * by the prior stage bootloader (bcmstb_boot_parameters.r1)
+	 * because we're using a device tree to boot Linux.
+	 */
+
+	return 0;
+}