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author | James Hogan <james.hogan@imgtec.com> | 2012-10-05 16:02:12 +0100 |
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committer | James Hogan <james.hogan@imgtec.com> | 2013-03-02 20:09:22 +0000 |
commit | 29dd78cf0b526d24063364a8c634b3e92514c1a2 (patch) | |
tree | 4dfa291da2d101242f5536be0146cba25e398838 /arch/metag/kernel/devtree.c | |
parent | 262d96b0deb44ed58823447825d6efa5dddb4108 (diff) | |
download | linux-29dd78cf0b526d24063364a8c634b3e92514c1a2.tar.bz2 |
metag: Device tree
Add device tree files to arch/metag.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/metag/kernel/devtree.c')
-rw-r--r-- | arch/metag/kernel/devtree.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/metag/kernel/devtree.c b/arch/metag/kernel/devtree.c new file mode 100644 index 000000000000..5b6b1d855492 --- /dev/null +++ b/arch/metag/kernel/devtree.c @@ -0,0 +1,97 @@ +/* + * linux/arch/metag/kernel/devtree.c + * + * Copyright (C) 2012 Imagination Technologies Ltd. + * + * Based on ARM version: + * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com> + * + * 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. + */ + +#include <linux/init.h> +#include <linux/export.h> +#include <linux/types.h> +#include <linux/bootmem.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <asm/setup.h> +#include <asm/page.h> +#include <asm/mach/arch.h> + +void __init early_init_dt_add_memory_arch(u64 base, u64 size) +{ + pr_err("%s(%llx, %llx)\n", + __func__, base, size); +} + +void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) +{ + return alloc_bootmem_align(size, align); +} + +/** + * setup_machine_fdt - Machine setup when an dtb was passed to the kernel + * @dt: virtual address pointer to dt blob + * + * If a dtb was passed to the kernel, then use it to choose the correct + * machine_desc and to setup the system. + */ +struct machine_desc * __init setup_machine_fdt(void *dt) +{ + struct boot_param_header *devtree = dt; + struct machine_desc *mdesc, *mdesc_best = NULL; + unsigned int score, mdesc_score = ~1; + unsigned long dt_root; + const char *model; + + /* check device tree validity */ + if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) + return NULL; + + /* Search the mdescs for the 'best' compatible value match */ + initial_boot_params = devtree; + dt_root = of_get_flat_dt_root(); + + for_each_machine_desc(mdesc) { + score = of_flat_dt_match(dt_root, mdesc->dt_compat); + if (score > 0 && score < mdesc_score) { + mdesc_best = mdesc; + mdesc_score = score; + } + } + if (!mdesc_best) { + const char *prop; + long size; + + pr_err("\nError: unrecognized/unsupported device tree compatible list:\n[ "); + + prop = of_get_flat_dt_prop(dt_root, "compatible", &size); + if (prop) { + while (size > 0) { + printk("'%s' ", prop); + size -= strlen(prop) + 1; + prop += strlen(prop) + 1; + } + } + printk("]\n\n"); + + dump_machine_table(); /* does not return */ + } + + model = of_get_flat_dt_prop(dt_root, "model", NULL); + if (!model) + model = of_get_flat_dt_prop(dt_root, "compatible", NULL); + if (!model) + model = "<unknown>"; + pr_info("Machine: %s, model: %s\n", mdesc_best->name, model); + + /* Retrieve various information from the /chosen node */ + of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); + + return mdesc_best; +} |