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author | John Crispin <blogic@openwrt.org> | 2013-01-20 21:02:01 (GMT) |
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committer | John Crispin <blogic@openwrt.org> | 2013-02-17 00:25:31 (GMT) |
commit | 3a5bfe7bdbfd37c9206d7c6dfd7eb9664ccc5038 (patch) | |
tree | 3fe631d5ee2bd37c19fd138463d207d0b80aefa5 | |
parent | 3f0a06b0368d25608841843e9d65a7289ad9f14a (diff) | |
download | linux-3a5bfe7bdbfd37c9206d7c6dfd7eb9664ccc5038.tar.xz |
MIPS: ralink: adds OF code
Until there is a generic MIPS way of handing the DTB over from bootloader to
kernel we rely on a built in devicetrees. The OF code also remaps those register
ranges that we use global in our drivers.
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4895/
-rw-r--r-- | arch/mips/ralink/of.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c new file mode 100644 index 0000000..4165e70 --- /dev/null +++ b/arch/mips/ralink/of.c @@ -0,0 +1,107 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> + * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org> + * Copyright (C) 2013 John Crispin <blogic@openwrt.org> + */ + +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/init.h> +#include <linux/of_fdt.h> +#include <linux/kernel.h> +#include <linux/bootmem.h> +#include <linux/of_platform.h> +#include <linux/of_address.h> + +#include <asm/reboot.h> +#include <asm/bootinfo.h> +#include <asm/addrspace.h> + +#include "common.h" + +__iomem void *rt_sysc_membase; +__iomem void *rt_memc_membase; + +extern struct boot_param_header __dtb_start; + +__iomem void *plat_of_remap_node(const char *node) +{ + struct resource res; + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, node); + if (!np) + panic("Failed to find %s node", node); + + if (of_address_to_resource(np, 0, &res)) + panic("Failed to get resource for %s", node); + + if ((request_mem_region(res.start, + resource_size(&res), + res.name) < 0)) + panic("Failed to request resources for %s", node); + + return ioremap_nocache(res.start, resource_size(&res)); +} + +void __init device_tree_init(void) +{ + unsigned long base, size; + void *fdt_copy; + + if (!initial_boot_params) + return; + + base = virt_to_phys((void *)initial_boot_params); + size = be32_to_cpu(initial_boot_params->totalsize); + + /* Before we do anything, lets reserve the dt blob */ + reserve_bootmem(base, size, BOOTMEM_DEFAULT); + + /* The strings in the flattened tree are referenced directly by the + * device tree, so copy the flattened device tree from init memory + * to regular memory. + */ + fdt_copy = alloc_bootmem(size); + memcpy(fdt_copy, initial_boot_params, size); + initial_boot_params = fdt_copy; + + unflatten_device_tree(); + + /* free the space reserved for the dt blob */ + free_bootmem(base, size); +} + +void __init plat_mem_setup(void) +{ + set_io_port_base(KSEG1); + + /* + * Load the builtin devicetree. This causes the chosen node to be + * parsed resulting in our memory appearing + */ + __dt_setup_arch(&__dtb_start); +} + +static int __init plat_of_setup(void) +{ + static struct of_device_id of_ids[3]; + int len = sizeof(of_ids[0].compatible); + + if (!of_have_populated_dt()) + panic("device tree not present"); + + strncpy(of_ids[0].compatible, soc_info.compatible, len); + strncpy(of_ids[1].compatible, "palmbus", len); + + if (of_platform_populate(NULL, of_ids, NULL, NULL)) + panic("failed to populate DT\n"); + + return 0; +} + +arch_initcall(plat_of_setup); |