提交 f2ffa5ab 编写于 作者: D Dezhong Diao 提交者: Grant Likely

of/mips: Add device tree support to MIPS

Add the ability to enable CONFIG_OF on the MIPS architecture.
Signed-off-by: NDezhong Diao <dediao@cisco.com>
[grant.likely@secretlab.ca: cleared out obsolete hooks,
	removed ARCH_HAS_DEVTREE_MEM,
	remove __init tags from header file,
	removed debugfs support hunk]
[ddaney@linux-mips.org: backed out over aggressive trimming of hooks]
Acked-by: NRalf Baechle <ralf@linux-mips.org>
Tested-by: NDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
上级 32c97689
......@@ -2107,6 +2107,13 @@ config SECCOMP
If unsure, say Y. Only embedded should say N here.
config USE_OF
bool "Flattened Device Tree support"
select OF
select OF_FLATTREE
help
Include support for flattened device tree machine descriptions.
endmenu
config LOCKDEP_SUPPORT
......
......@@ -16,6 +16,11 @@
#include <irq.h>
static inline void irq_dispose_mapping(unsigned int virq)
{
return;
}
#ifdef CONFIG_I8259
static inline int irq_canonicalize(int irq)
{
......
/*
* arch/mips/include/asm/prom.h
*
* Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.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.
*
*/
#ifndef __ASM_MIPS_PROM_H
#define __ASM_MIPS_PROM_H
#ifdef CONFIG_OF
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/bootinfo.h>
/* which is compatible with the flattened device tree (FDT) */
#define cmd_line arcs_cmdline
extern int early_init_dt_scan_memory_arch(unsigned long node,
const char *uname, int depth, void *data);
extern int reserve_mem_mach(unsigned long addr, unsigned long size);
extern void free_mem_mach(unsigned long addr, unsigned long size);
extern void __init device_tree_init(void);
#else /* CONFIG_OF */
static inline void __init device_tree_init(void) { }
#endif /* CONFIG_OF */
#endif /* _ASM_MIPS_PROM_H */
......@@ -96,6 +96,8 @@ obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
obj-$(CONFIG_OF) += prom.o
CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(KBUILD_CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)
obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT) += 8250-platform.o
......
/*
* MIPS support for CONFIG_OF device tree support
*
* Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.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/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/debugfs.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/page.h>
#include <asm/prom.h>
int __init early_init_dt_scan_memory_arch(unsigned long node,
const char *uname, int depth,
void *data)
{
return early_init_dt_scan_memory(node, uname, depth, data);
}
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
return add_memory_region(base, size, BOOT_MEM_RAM);
}
int __init reserve_mem_mach(unsigned long addr, unsigned long size)
{
return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
}
void __init free_mem_mach(unsigned long addr, unsigned long size)
{
return free_bootmem(addr, size);
}
u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
{
return virt_to_phys(
__alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS))
);
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init early_init_dt_setup_initrd_arch(unsigned long start,
unsigned long end)
{
initrd_start = (unsigned long)__va(start);
initrd_end = (unsigned long)__va(end);
initrd_below_start_ok = 1;
}
#endif
/*
* irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
*
* Currently the mapping mechanism is trivial; simple flat hwirq numbers are
* mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not
* supported.
*/
unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
return intspec[0];
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
void __init early_init_devtree(void *params)
{
/* Setup flat device-tree pointer */
initial_boot_params = params;
/* Retrieve various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
* size, and more ...
*/
of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
/* Scan memory nodes */
of_scan_flat_dt(early_init_dt_scan_root, NULL);
of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
}
void __init device_tree_init(void)
{
unsigned long base, size;
if (!initial_boot_params)
return;
base = virt_to_phys((void *)initial_boot_params);
size = initial_boot_params->totalsize;
/* Before we do anything, lets reserve the dt blob */
reserve_mem_mach(base, size);
unflatten_device_tree();
/* free the space reserved for the dt blob */
free_mem_mach(base, size);
}
......@@ -31,6 +31,7 @@
#include <asm/setup.h>
#include <asm/smp-ops.h>
#include <asm/system.h>
#include <asm/prom.h>
struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
......@@ -487,6 +488,7 @@ static void __init arch_mem_init(char **cmdline_p)
}
bootmem_init();
device_tree_init();
sparse_init();
paging_init();
}
......
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