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128 lines
3.4 KiB
Diff
128 lines
3.4 KiB
Diff
From 3a5bfe7bdbfd37c9206d7c6dfd7eb9664ccc5038 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 20 Jan 2013 22:02:01 +0100
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Subject: [PATCH 06/14] MIPS: ralink: adds OF code
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Until there is a generic MIPS way of handing the DTB over from bootloader to
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kernel we rely on a built in devicetrees. The OF code also remaps those register
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ranges that we use global in our drivers.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Patchwork: http://patchwork.linux-mips.org/patch/4895/
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---
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arch/mips/ralink/of.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 107 insertions(+)
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create mode 100644 arch/mips/ralink/of.c
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--- /dev/null
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+++ b/arch/mips/ralink/of.c
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@@ -0,0 +1,107 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/io.h>
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+#include <linux/clk.h>
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+#include <linux/init.h>
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+#include <linux/of_fdt.h>
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+#include <linux/kernel.h>
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+#include <linux/bootmem.h>
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+#include <linux/of_platform.h>
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+#include <linux/of_address.h>
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+
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+#include <asm/reboot.h>
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+#include <asm/bootinfo.h>
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+#include <asm/addrspace.h>
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+
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+#include "common.h"
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+
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+__iomem void *rt_sysc_membase;
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+__iomem void *rt_memc_membase;
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+
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+extern struct boot_param_header __dtb_start;
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+
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+__iomem void *plat_of_remap_node(const char *node)
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+{
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+ struct resource res;
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+ struct device_node *np;
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+
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+ np = of_find_compatible_node(NULL, NULL, node);
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+ if (!np)
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+ panic("Failed to find %s node", node);
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+
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+ if (of_address_to_resource(np, 0, &res))
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+ panic("Failed to get resource for %s", node);
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+
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+ if ((request_mem_region(res.start,
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+ resource_size(&res),
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+ res.name) < 0))
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+ panic("Failed to request resources for %s", node);
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+
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+ return ioremap_nocache(res.start, resource_size(&res));
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+}
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+
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+void __init device_tree_init(void)
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+{
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+ unsigned long base, size;
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+ void *fdt_copy;
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+
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+ if (!initial_boot_params)
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+ return;
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+
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+ base = virt_to_phys((void *)initial_boot_params);
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+ size = be32_to_cpu(initial_boot_params->totalsize);
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+
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+ /* Before we do anything, lets reserve the dt blob */
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+ reserve_bootmem(base, size, BOOTMEM_DEFAULT);
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+
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+ /* The strings in the flattened tree are referenced directly by the
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+ * device tree, so copy the flattened device tree from init memory
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+ * to regular memory.
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+ */
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+ fdt_copy = alloc_bootmem(size);
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+ memcpy(fdt_copy, initial_boot_params, size);
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+ initial_boot_params = fdt_copy;
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+
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+ unflatten_device_tree();
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+
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+ /* free the space reserved for the dt blob */
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+ free_bootmem(base, size);
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+}
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+
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+void __init plat_mem_setup(void)
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+{
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+ set_io_port_base(KSEG1);
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+
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+ /*
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+ * Load the builtin devicetree. This causes the chosen node to be
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+ * parsed resulting in our memory appearing
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+ */
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+ __dt_setup_arch(&__dtb_start);
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+}
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+
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+static int __init plat_of_setup(void)
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+{
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+ static struct of_device_id of_ids[3];
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+ int len = sizeof(of_ids[0].compatible);
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+
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+ if (!of_have_populated_dt())
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+ panic("device tree not present");
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+
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+ strncpy(of_ids[0].compatible, soc_info.compatible, len);
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+ strncpy(of_ids[1].compatible, "palmbus", len);
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+
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+ if (of_platform_populate(NULL, of_ids, NULL, NULL))
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+ panic("failed to populate DT\n");
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+
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+ return 0;
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+}
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+
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+arch_initcall(plat_of_setup);
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