239 lines
6.4 KiB
C
239 lines
6.4 KiB
C
/*
|
|
* linux/arch/arm/kernel/devtree.c
|
|
*
|
|
* 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/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/page.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
arm_add_memory(base, size);
|
|
}
|
|
|
|
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return alloc_bootmem_align(size, align);
|
|
}
|
|
|
|
void __init arm_dt_memblock_reserve(void)
|
|
{
|
|
u64 *reserve_map, base, size;
|
|
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
/* Reserve the dtb region */
|
|
memblock_reserve(virt_to_phys(initial_boot_params),
|
|
be32_to_cpu(initial_boot_params->totalsize));
|
|
|
|
/*
|
|
* Process the reserve map. This will probably overlap the initrd
|
|
* and dtb locations which are already reserved, but overlaping
|
|
* doesn't hurt anything
|
|
*/
|
|
reserve_map = ((void*)initial_boot_params) +
|
|
be32_to_cpu(initial_boot_params->off_mem_rsvmap);
|
|
while (1) {
|
|
base = be64_to_cpup(reserve_map++);
|
|
size = be64_to_cpup(reserve_map++);
|
|
if (!size)
|
|
break;
|
|
memblock_reserve(base, size);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree
|
|
* and builds the cpu logical map array containing MPIDR values related to
|
|
* logical cpus
|
|
*
|
|
* Updates the cpu possible mask with the number of parsed cpu nodes
|
|
*/
|
|
void __init arm_dt_init_cpu_maps(void)
|
|
{
|
|
/*
|
|
* Temp logical map is initialized with UINT_MAX values that are
|
|
* considered invalid logical map entries since the logical map must
|
|
* contain a list of MPIDR[23:0] values where MPIDR[31:24] must
|
|
* read as 0.
|
|
*/
|
|
struct device_node *cpu, *cpus;
|
|
u32 i, j, cpuidx = 1;
|
|
u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
|
|
|
|
u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = UINT_MAX };
|
|
bool bootcpu_valid = false;
|
|
cpus = of_find_node_by_path("/cpus");
|
|
|
|
if (!cpus)
|
|
return;
|
|
|
|
for_each_child_of_node(cpus, cpu) {
|
|
u32 hwid;
|
|
|
|
pr_debug(" * %s...\n", cpu->full_name);
|
|
/*
|
|
* A device tree containing CPU nodes with missing "reg"
|
|
* properties is considered invalid to build the
|
|
* cpu_logical_map.
|
|
*/
|
|
if (of_property_read_u32(cpu, "reg", &hwid)) {
|
|
pr_debug(" * %s missing reg property\n",
|
|
cpu->full_name);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 8 MSBs must be set to 0 in the DT since the reg property
|
|
* defines the MPIDR[23:0].
|
|
*/
|
|
if (hwid & ~MPIDR_HWID_BITMASK)
|
|
return;
|
|
|
|
/*
|
|
* Duplicate MPIDRs are a recipe for disaster.
|
|
* Scan all initialized entries and check for
|
|
* duplicates. If any is found just bail out.
|
|
* temp values were initialized to UINT_MAX
|
|
* to avoid matching valid MPIDR[23:0] values.
|
|
*/
|
|
for (j = 0; j < cpuidx; j++)
|
|
if (WARN(tmp_map[j] == hwid, "Duplicate /cpu reg "
|
|
"properties in the DT\n"))
|
|
return;
|
|
|
|
/*
|
|
* Build a stashed array of MPIDR values. Numbering scheme
|
|
* requires that if detected the boot CPU must be assigned
|
|
* logical id 0. Other CPUs get sequential indexes starting
|
|
* from 1. If a CPU node with a reg property matching the
|
|
* boot CPU MPIDR is detected, this is recorded so that the
|
|
* logical map built from DT is validated and can be used
|
|
* to override the map created in smp_setup_processor_id().
|
|
*/
|
|
if (hwid == mpidr) {
|
|
i = 0;
|
|
bootcpu_valid = true;
|
|
} else {
|
|
i = cpuidx++;
|
|
}
|
|
|
|
if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than "
|
|
"max cores %u, capping them\n",
|
|
cpuidx, nr_cpu_ids)) {
|
|
cpuidx = nr_cpu_ids;
|
|
break;
|
|
}
|
|
|
|
tmp_map[i] = hwid;
|
|
}
|
|
|
|
if (WARN(!bootcpu_valid, "DT missing boot CPU MPIDR[23:0], "
|
|
"fall back to default cpu_logical_map\n"))
|
|
return;
|
|
|
|
/*
|
|
* Since the boot CPU node contains proper data, and all nodes have
|
|
* a reg property, the DT CPU list can be considered valid and the
|
|
* logical map created in smp_setup_processor_id() can be overridden
|
|
*/
|
|
for (i = 0; i < cpuidx; i++) {
|
|
set_cpu_possible(i, true);
|
|
cpu_logical_map(i) = tmp_map[i];
|
|
pr_debug("cpu logical map 0x%x\n", cpu_logical_map(i));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
|
|
* @dt_phys: physical address of dt blob
|
|
*
|
|
* If a dtb was passed to the kernel in r2, then use it to choose the
|
|
* correct machine_desc and to setup the system.
|
|
*/
|
|
struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
|
|
{
|
|
struct boot_param_header *devtree;
|
|
struct machine_desc *mdesc, *mdesc_best = NULL;
|
|
unsigned int score, mdesc_score = ~1;
|
|
unsigned long dt_root;
|
|
const char *model;
|
|
|
|
if (!dt_phys)
|
|
return NULL;
|
|
|
|
devtree = phys_to_virt(dt_phys);
|
|
|
|
/* 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;
|
|
|
|
early_print("\nError: unrecognized/unsupported "
|
|
"device tree compatible list:\n[ ");
|
|
|
|
prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
|
|
while (size > 0) {
|
|
early_print("'%s' ", prop);
|
|
size -= strlen(prop) + 1;
|
|
prop += strlen(prop) + 1;
|
|
}
|
|
early_print("]\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);
|
|
/* 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);
|
|
|
|
/* Change machine number to match the mdesc we're using */
|
|
__machine_arch_type = mdesc_best->nr;
|
|
|
|
return mdesc_best;
|
|
}
|