linux/arch/arm/kernel/devtree.c
Rob Herring 3562257b34 ARM: 9322/1: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2023-10-05 16:15:42 +01:00

239 lines
5.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/kernel/devtree.c
*
* Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
*/
#include <linux/init.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_irq.h>
#include <linux/smp.h>
#include <asm/cputype.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/prom.h>
#include <asm/smp_plat.h>
#include <asm/mach/arch.h>
#include <asm/mach-types.h>
#ifdef CONFIG_SMP
extern struct of_cpu_method __cpu_method_of_table[];
static const struct of_cpu_method __cpu_method_of_table_sentinel
__used __section("__cpu_method_of_table_end");
static int __init set_smp_ops_by_method(struct device_node *node)
{
const char *method;
struct of_cpu_method *m = __cpu_method_of_table;
if (of_property_read_string(node, "enable-method", &method))
return 0;
for (; m->method; m++)
if (!strcmp(m->method, method)) {
smp_set_ops(m->ops);
return 1;
}
return 0;
}
#else
static inline int set_smp_ops_by_method(struct device_node *node)
{
return 1;
}
#endif
/*
* 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;
int found_method = 0;
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] = MPIDR_INVALID };
bool bootcpu_valid = false;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return;
for_each_of_cpu_node(cpu) {
u32 hwid = of_get_cpu_hwid(cpu, 0);
pr_debug(" * %pOF...\n", cpu);
/*
* Bits n:24 must be set to 0 in the DT since the reg property
* defines the MPIDR[23:0].
*/
if (hwid & ~MPIDR_HWID_BITMASK) {
of_node_put(cpu);
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")) {
of_node_put(cpu);
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;
of_node_put(cpu);
break;
}
tmp_map[i] = hwid;
if (!found_method)
found_method = set_smp_ops_by_method(cpu);
}
/*
* Fallback to an enable-method in the cpus node if nothing found in
* a cpu node.
*/
if (!found_method)
set_smp_ops_by_method(cpus);
if (!bootcpu_valid) {
pr_warn("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));
}
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return phys_id == cpu_logical_map(cpu);
}
static const void * __init arch_get_next_mach(const char *const **match)
{
static const struct machine_desc *mdesc = __arch_info_begin;
const struct machine_desc *m = mdesc;
if (m >= __arch_info_end)
return NULL;
mdesc++;
*match = m->dt_compat;
return m;
}
/**
* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
* @dt_virt: virtual 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.
*/
const struct machine_desc * __init setup_machine_fdt(void *dt_virt)
{
const struct machine_desc *mdesc, *mdesc_best = NULL;
DT_MACHINE_START(GENERIC_DT, "Generic DT based system")
.l2c_aux_val = 0x0,
.l2c_aux_mask = ~0x0,
MACHINE_END
mdesc_best = &__mach_desc_GENERIC_DT;
if (!dt_virt || !early_init_dt_verify(dt_virt))
return NULL;
mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
if (!mdesc) {
const char *prop;
int size;
unsigned long dt_root;
early_print("\nError: unrecognized/unsupported "
"device tree compatible list:\n[ ");
dt_root = of_get_flat_dt_root();
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 */
}
/* We really don't want to do this, but sometimes firmware provides buggy data */
if (mdesc->dt_fixup)
mdesc->dt_fixup();
early_init_dt_scan_nodes();
/* Change machine number to match the mdesc we're using */
__machine_arch_type = mdesc->nr;
return mdesc;
}