diff options
Diffstat (limited to 'arch/mips/ralink/of.c')
-rw-r--r-- | arch/mips/ralink/of.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c new file mode 100644 index 000000000..1f7c686f7 --- /dev/null +++ b/arch/mips/ralink/of.c @@ -0,0 +1,109 @@ +/* + * 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 <john@phrozen.org> + */ + +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/sizes.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 <asm/prom.h> + +#include "common.h" + +__iomem void *rt_sysc_membase; +__iomem void *rt_memc_membase; +EXPORT_SYMBOL_GPL(rt_sysc_membase); + +__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)) + panic("Failed to request resources for %s", node); + + return ioremap_nocache(res.start, resource_size(&res)); +} + +void __init device_tree_init(void) +{ + unflatten_and_copy_device_tree(); +} + +static int memory_dtb; + +static int __init early_init_dt_find_memory(unsigned long node, + const char *uname, int depth, void *data) +{ + if (depth == 1 && !strcmp(uname, "memory@0")) + memory_dtb = 1; + + return 0; +} + +void __init plat_mem_setup(void) +{ + void *dtb = NULL; + + set_io_port_base(KSEG1); + + /* + * Load the builtin devicetree. This causes the chosen node to be + * parsed resulting in our memory appearing. fw_passed_dtb is used + * by CONFIG_MIPS_APPENDED_RAW_DTB as well. + */ + if (fw_passed_dtb) + dtb = (void *)fw_passed_dtb; + else if (&__dtb_start != &__dtb_end) + dtb = (void *)__dtb_start; + + __dt_setup_arch(dtb); + + of_scan_flat_dt(early_init_dt_find_memory, NULL); + if (memory_dtb) + of_scan_flat_dt(early_init_dt_scan_memory, NULL); + else if (soc_info.mem_size) + add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M, + BOOT_MEM_RAM); + else + detect_memory_region(soc_info.mem_base, + soc_info.mem_size_min * SZ_1M, + soc_info.mem_size_max * SZ_1M); +} + +static int __init plat_of_setup(void) +{ + __dt_register_buses(soc_info.compatible, "palmbus"); + + /* make sure that the reset controller is setup early */ + ralink_rst_init(); + + return 0; +} + +arch_initcall(plat_of_setup); |