/* * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) * * Based on reduced version of METAG * * 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/reboot.h>#include <linux/memblock.h>#include <linux/of.h>#include <linux/of_fdt.h>#include <asm/prom.h>#include <asm/clk.h>#include <asm/mach_desc.h>/** * 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 = NULL, *mdesc_best = NULL; unsigned int score, mdesc_score = ~1; unsigned long dt_root; const char *model, *compat; void *clk; char manufacturer[16]; unsigned long len; /* check device tree validity */ if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) return NULL; initial_boot_params = devtree; dt_root = of_get_flat_dt_root(); /* * The kernel could be multi-platform enabled, thus could have many * "baked-in" machine descriptors. Search thru all for the best * "compatible" string match. */ 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("\n unrecognized device tree 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"); machine_halt(); } /* compat = "<manufacturer>,<model>" */ compat = mdesc_best->dt_compat[0]; model = strchr(compat, ','); if (model) model++; strlcpy(manufacturer, compat, model ? model - compat : strlen(compat)); pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer); /* Retrieve various information from the /chosen node */ of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); /* Initialize {size,address}-cells info */ of_scan_flat_dt(early_init_dt_scan_root, NULL); /* Setup memory, calling early_init_dt_add_memory_arch */ of_scan_flat_dt(early_init_dt_scan_memory, NULL); clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); if (clk) arc_set_core_freq(of_read_ulong(clk, len/4)); return mdesc_best;}/* * Copy the flattened DT out of .init since unflattening doesn't copy strings * and the normal DT APIs refs them from orig flat DT */void __init copy_devtree(void){ void *alloc = early_init_dt_alloc_memory_arch( be32_to_cpu(initial_boot_params->totalsize), 64); if (alloc) { memcpy(alloc, initial_boot_params, be32_to_cpu(initial_boot_params->totalsize)); initial_boot_params = alloc; }}
/*
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
*
* Based on reduced version of METAG
*
* 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/reboot.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <asm/prom.h>
#include <asm/clk.h>
#include <asm/mach_desc.h>
/**
* 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 = NULL, *mdesc_best = NULL;
unsigned int score, mdesc_score = ~1;
unsigned long dt_root;
const char *model, *compat;
void *clk;
char manufacturer[16];
unsigned long len;
/* check device tree validity */
if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
return NULL;
initial_boot_params = devtree;
dt_root = of_get_flat_dt_root();
/*
* The kernel could be multi-platform enabled, thus could have many
* "baked-in" machine descriptors. Search thru all for the best
* "compatible" string match.
*/
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("\n unrecognized device tree 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");
machine_halt();
}
/* compat = "<manufacturer>,<model>" */
compat = mdesc_best->dt_compat[0];
model = strchr(compat, ',');
if (model)
model++;
strlcpy(manufacturer, compat, model ? model - compat : strlen(compat));
pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer);
/* Retrieve various information from the /chosen node */
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
/* Initialize {size,address}-cells info */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
/* Setup memory, calling early_init_dt_add_memory_arch */
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
if (clk)
arc_set_core_freq(of_read_ulong(clk, len/4));
return mdesc_best;
}
/*
* Copy the flattened DT out of .init since unflattening doesn't copy strings
* and the normal DT APIs refs them from orig flat DT
*/
void __init copy_devtree(void)
{
void *alloc = early_init_dt_alloc_memory_arch(
be32_to_cpu(initial_boot_params->totalsize), 64);
if (alloc) {
memcpy(alloc, initial_boot_params,
be32_to_cpu(initial_boot_params->totalsize));
initial_boot_params = alloc;
}
}