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234 lines
6.2 KiB
Diff
234 lines
6.2 KiB
Diff
From: Dezhong Diao <dediao@cisco.com>
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Date: Wed, 13 Oct 2010 06:52:46 +0000 (-0600)
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Subject: of/mips: Add device tree support to MIPS
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X-Git-Tag: v2.6.37-rc1~129^2~3
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=f2ffa5ab74f4dfd598860f96ca37a71c4d0a28a8
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of/mips: Add device tree support to MIPS
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Add the ability to enable CONFIG_OF on the MIPS architecture.
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Signed-off-by: Dezhong Diao <dediao@cisco.com>
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[grant.likely@secretlab.ca: cleared out obsolete hooks,
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removed ARCH_HAS_DEVTREE_MEM,
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remove __init tags from header file,
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removed debugfs support hunk]
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[ddaney@linux-mips.org: backed out over aggressive trimming of hooks]
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Acked-by: Ralf Baechle <ralf@linux-mips.org>
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Tested-by: David Daney <ddaney@caviumnetworks.com>
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Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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---
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--- a/arch/mips/Kconfig
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+++ b/arch/mips/Kconfig
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@@ -2146,6 +2146,13 @@ config SECCOMP
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If unsure, say Y. Only embedded should say N here.
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+config USE_OF
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+ bool "Flattened Device Tree support"
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+ select OF
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+ select OF_FLATTREE
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+ help
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+ Include support for flattened device tree machine descriptions.
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+
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endmenu
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config LOCKDEP_SUPPORT
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--- a/arch/mips/include/asm/irq.h
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+++ b/arch/mips/include/asm/irq.h
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@@ -16,6 +16,11 @@
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#include <irq.h>
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+static inline void irq_dispose_mapping(unsigned int virq)
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+{
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+ return;
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+}
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+
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#ifdef CONFIG_I8259
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static inline int irq_canonicalize(int irq)
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{
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--- /dev/null
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+++ b/arch/mips/include/asm/prom.h
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@@ -0,0 +1,35 @@
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+/*
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+ * arch/mips/include/asm/prom.h
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+ *
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+ * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ */
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+#ifndef __ASM_MIPS_PROM_H
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+#define __ASM_MIPS_PROM_H
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+
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+#ifdef CONFIG_OF
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+#include <linux/init.h>
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+
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+#include <asm/setup.h>
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+#include <asm/irq.h>
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+#include <asm/bootinfo.h>
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+
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+/* which is compatible with the flattened device tree (FDT) */
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+#define cmd_line arcs_cmdline
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+
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+extern int early_init_dt_scan_memory_arch(unsigned long node,
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+ const char *uname, int depth, void *data);
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+
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+extern int reserve_mem_mach(unsigned long addr, unsigned long size);
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+extern void free_mem_mach(unsigned long addr, unsigned long size);
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+
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+extern void __init device_tree_init(void);
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+#else /* CONFIG_OF */
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+static inline void __init device_tree_init(void) { }
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+#endif /* CONFIG_OF */
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+
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+#endif /* _ASM_MIPS_PROM_H */
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--- a/arch/mips/kernel/Makefile
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+++ b/arch/mips/kernel/Makefile
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@@ -97,6 +97,8 @@ obj-$(CONFIG_EARLY_PRINTK) += early_prin
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obj-$(CONFIG_SPINLOCK_TEST) += spinlock_test.o
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obj-$(CONFIG_MIPS_MACHINE) += mips_machine.o
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+obj-$(CONFIG_OF) += prom.o
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+
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CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(KBUILD_CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)
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obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT) += 8250-platform.o
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--- /dev/null
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+++ b/arch/mips/kernel/prom.c
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@@ -0,0 +1,112 @@
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+/*
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+ * MIPS support for CONFIG_OF device tree support
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+ *
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+ * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/errno.h>
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+#include <linux/types.h>
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+#include <linux/bootmem.h>
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+#include <linux/initrd.h>
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+#include <linux/debugfs.h>
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+#include <linux/of.h>
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+#include <linux/of_fdt.h>
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+#include <linux/of_irq.h>
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+#include <linux/of_platform.h>
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+
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+#include <asm/page.h>
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+#include <asm/prom.h>
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+
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+int __init early_init_dt_scan_memory_arch(unsigned long node,
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+ const char *uname, int depth,
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+ void *data)
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+{
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+ return early_init_dt_scan_memory(node, uname, depth, data);
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+}
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+
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+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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+{
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+ return add_memory_region(base, size, BOOT_MEM_RAM);
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+}
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+
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+int __init reserve_mem_mach(unsigned long addr, unsigned long size)
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+{
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+ return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
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+}
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+
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+void __init free_mem_mach(unsigned long addr, unsigned long size)
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+{
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+ return free_bootmem(addr, size);
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+}
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+
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+u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
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+{
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+ return virt_to_phys(
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+ __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS))
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+ );
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+}
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+
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+#ifdef CONFIG_BLK_DEV_INITRD
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+void __init early_init_dt_setup_initrd_arch(unsigned long start,
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+ unsigned long end)
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+{
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+ initrd_start = (unsigned long)__va(start);
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+ initrd_end = (unsigned long)__va(end);
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+ initrd_below_start_ok = 1;
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+}
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+#endif
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+
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+/*
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+ * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
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+ *
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+ * Currently the mapping mechanism is trivial; simple flat hwirq numbers are
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+ * mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not
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+ * supported.
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+ */
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+unsigned int irq_create_of_mapping(struct device_node *controller,
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+ const u32 *intspec, unsigned int intsize)
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+{
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+ return intspec[0];
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+}
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+EXPORT_SYMBOL_GPL(irq_create_of_mapping);
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+
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+void __init early_init_devtree(void *params)
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+{
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+ /* Setup flat device-tree pointer */
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+ initial_boot_params = params;
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+
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+ /* Retrieve various informations from the /chosen node of the
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+ * device-tree, including the platform type, initrd location and
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+ * size, and more ...
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+ */
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+ of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
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+
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+ /* Scan memory nodes */
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+ of_scan_flat_dt(early_init_dt_scan_root, NULL);
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+ of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
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+}
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+
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+void __init device_tree_init(void)
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+{
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+ unsigned long base, size;
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+
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+ if (!initial_boot_params)
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+ return;
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+
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+ base = virt_to_phys((void *)initial_boot_params);
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+ size = initial_boot_params->totalsize;
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+
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+ /* Before we do anything, lets reserve the dt blob */
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+ reserve_mem_mach(base, size);
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+
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+ unflatten_device_tree();
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+
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+ /* free the space reserved for the dt blob */
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+ free_mem_mach(base, size);
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+}
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--- a/arch/mips/kernel/setup.c
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+++ b/arch/mips/kernel/setup.c
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@@ -31,6 +31,7 @@
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#include <asm/setup.h>
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#include <asm/smp-ops.h>
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#include <asm/system.h>
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+#include <asm/prom.h>
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struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
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@@ -487,6 +488,7 @@ static void __init arch_mem_init(char **
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}
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bootmem_init();
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+ device_tree_init();
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sparse_init();
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paging_init();
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}
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