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Date: Sun, 11 Nov 2012 13:50:35 +0100
From: Jonas Gorski <jonas.gorski@...il.com>
To: linux-mips@...ux-mips.org
Cc: Ralf Baechle <ralf@...ux-mips.org>,
John Crispin <blogic@...nwrt.org>,
Maxime Bizon <mbizon@...ebox.fr>,
Florian Fainelli <florian@...nwrt.org>,
Kevin Cernekee <cernekee@...il.com>,
devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [RFC] MIPS: BCM63XX: add support for loading DTB
Add support for loading DTBs embedded into the kernel. Iterate through
all embedded ones until a match is found and use that.
Use the NVRAM provided board name for constructing the compatible
property for selecting the appropriate in-kernel DTB.
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
arch/mips/Kconfig | 1 +
arch/mips/bcm63xx/Kconfig | 2 +
arch/mips/bcm63xx/Makefile | 1 +
arch/mips/bcm63xx/dts/Kconfig | 3 +
arch/mips/bcm63xx/dts/Makefile | 2 +
arch/mips/bcm63xx/setup.c | 80 ++++++++++++++++++++++++++++++++++++++++
6 files changed, 89 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/bcm63xx/dts/Kconfig
create mode 100644 arch/mips/bcm63xx/dts/Makefile
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9934a46..168b0fc 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -132,6 +132,7 @@ config BCM63XX
select SWAP_IO_SPACE
select ARCH_REQUIRE_GPIOLIB
select HAVE_CLK
+ select USE_OF
help
Support for BCM63XX based boards
diff --git a/arch/mips/bcm63xx/Kconfig b/arch/mips/bcm63xx/Kconfig
index d03e879..03d693b 100644
--- a/arch/mips/bcm63xx/Kconfig
+++ b/arch/mips/bcm63xx/Kconfig
@@ -31,3 +31,5 @@ config BCM63XX_CPU_6368
endmenu
source "arch/mips/bcm63xx/boards/Kconfig"
+
+source "arch/mips/bcm63xx/dts/Kconfig"
diff --git a/arch/mips/bcm63xx/Makefile b/arch/mips/bcm63xx/Makefile
index ac28073..30971a7 100644
--- a/arch/mips/bcm63xx/Makefile
+++ b/arch/mips/bcm63xx/Makefile
@@ -5,3 +5,4 @@ obj-y += clk.o cpu.o cs.o gpio.o irq.o nvram.o prom.o reset.o \
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-y += boards/
+obj-y += dts/
diff --git a/arch/mips/bcm63xx/dts/Kconfig b/arch/mips/bcm63xx/dts/Kconfig
new file mode 100644
index 0000000..919f3f6
--- /dev/null
+++ b/arch/mips/bcm63xx/dts/Kconfig
@@ -0,0 +1,3 @@
+menu "Built-in Device Tree support"
+
+endmenu
diff --git a/arch/mips/bcm63xx/dts/Makefile b/arch/mips/bcm63xx/dts/Makefile
new file mode 100644
index 0000000..69c374b
--- /dev/null
+++ b/arch/mips/bcm63xx/dts/Makefile
@@ -0,0 +1,2 @@
+$(obj)/%.dtb: $(obj)/%.dts
+ $(call if_changed,dtc)
diff --git a/arch/mips/bcm63xx/setup.c b/arch/mips/bcm63xx/setup.c
index 314231b..8712354 100644
--- a/arch/mips/bcm63xx/setup.c
+++ b/arch/mips/bcm63xx/setup.c
@@ -4,6 +4,7 @@
* for more details.
*
* Copyright (C) 2008 Maxime Bizon <mbizon@...ebox.fr>
+ * Copyright (C) 2012 Jonas Gorski <jonas.gorski@...il.com>
*/
#include <linux/init.h>
@@ -12,6 +13,8 @@
#include <linux/bootmem.h>
#include <linux/ioport.h>
#include <linux/pm.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/reboot.h>
@@ -20,6 +23,7 @@
#include <bcm63xx_cpu.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
+#include <bcm963xx_tag.h>
void bcm63xx_machine_halt(void)
{
@@ -152,6 +156,82 @@ void __init plat_mem_setup(void)
board_setup();
}
+extern struct boot_param_header __dtb_start;
+extern struct boot_param_header __dtb_end;
+
+int __init bcm63xx_is_compatible(struct boot_param_header *devtree,
+ const char *compat)
+{
+ unsigned long dt_root;
+ struct boot_param_header *old_ibp = initial_boot_params;
+ int ret;
+
+ initial_boot_params = devtree;
+
+ dt_root = of_get_flat_dt_root();
+ ret = of_flat_dt_is_compatible(dt_root, compat);
+
+ initial_boot_params = old_ibp;
+
+ return ret;
+}
+
+static struct of_device_id of_ids[] = {
+ { /* will be filled at runtime */ },
+ { .compatible = "simple-bus" },
+ { },
+};
+
+static struct boot_param_header *find_compatible_tree(const char *compat)
+{
+ struct boot_param_header *curr = &__dtb_start;
+
+ while (curr < &__dtb_end) {
+ if (be32_to_cpu(curr->magic) != OF_DT_HEADER)
+ continue;
+
+ if (bcm63xx_is_compatible(curr, compat))
+ return curr;
+
+ /* in-kernel dtbs are aligned to 32 bytes */
+ curr = (void *)curr + roundup(be32_to_cpu(curr->totalsize), 32);
+ }
+
+ return NULL;
+}
+
+void __init device_tree_init(void)
+{
+ struct boot_param_header *devtree = NULL;
+ const char *name = board_get_name();
+
+ strncpy(of_ids[0].compatible, name, BOARDID_LEN);
+
+ devtree = find_compatible_tree(of_ids[0].compatible);
+ if (!devtree) {
+ pr_warn("no compatible device tree found for board %s\n"
+ of_ids[0].compatible);
+ return;
+ }
+
+ __dt_setup_arch(devtree);
+ reserve_bootmem(virt_to_phys(devtree), be32_to_cpu(devtree->totalsize),
+ BOOTMEM_DEFAULT);
+
+ unflatten_device_tree();
+}
+
+int __init bcm63xx_populate_device_tree(void)
+{
+ if (!of_have_populated_dt()) {
+ pr_warn("device tree not available\n");
+ return -ENODEV;
+ }
+
+ return of_platform_populate(NULL, of_ids, NULL, NULL);
+}
+arch_initcall(bcm63xx_populate_device_tree);
+
int __init bcm63xx_register_devices(void)
{
return board_register_devices();
--
1.7.2.5
--
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