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authorRich Felker <dalias@libc.org>2016-01-23 00:45:41 +0000
committerRich Felker <dalias@libc.org>2016-03-17 19:46:11 +0000
commit7480e0aabd5f9e6c3e3b72ed206e89284e90f11f (patch)
treeafcdb346dbec13ea4be79f062e9f849caedceaae /arch/sh/kernel/setup.c
parentsh: remove arch-specific localtimer and use generic one (diff)
downloadlinux-dev-7480e0aabd5f9e6c3e3b72ed206e89284e90f11f.tar.xz
linux-dev-7480e0aabd5f9e6c3e3b72ed206e89284e90f11f.zip
sh: add device tree support and generic board using device tree
Add a new pseudo-board, within the existing SH boards/machine-vectors framework, which does not represent any actual hardware but instead requires all hardware to be described by the device tree blob provided by the boot loader. Changes made are thus non-invasive and do not risk breaking support for legacy boards. New hardware, including the open-hardware J2 and associated SoC devices, will use device free from the outset. Legacy SH boards can transition to device tree once all their hardware has device tree bindings, driver support for device tree, and a dts file for the board. It is intented that, once all boards are supported in the new framework, the existing machine-vectors framework should be removed and the new device tree setup code integrated directly. Signed-off-by: Rich Felker <dalias@libc.org>
Diffstat (limited to 'arch/sh/kernel/setup.c')
-rw-r--r--arch/sh/kernel/setup.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index de19cfa768f2..efb60ce720a7 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -29,6 +29,8 @@
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/memblock.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/page.h>
@@ -172,6 +174,7 @@ disable:
#endif
}
+#ifndef CONFIG_GENERIC_CALIBRATE_DELAY
void calibrate_delay(void)
{
struct clk *clk = clk_get(NULL, "cpu_clk");
@@ -187,6 +190,7 @@ void calibrate_delay(void)
(loops_per_jiffy/(5000/HZ)) % 100,
loops_per_jiffy);
}
+#endif
void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
unsigned long end_pfn)
@@ -238,6 +242,29 @@ void __init __weak plat_early_device_setup(void)
{
}
+#ifdef CONFIG_OF
+void __ref sh_fdt_init(phys_addr_t dt_phys)
+{
+ static int done = 0;
+ void *dt_virt;
+
+ /* Avoid calling an __init function on secondary cpus. */
+ if (done) return;
+
+ dt_virt = phys_to_virt(dt_phys);
+
+ if (!dt_virt || !early_init_dt_scan(dt_virt)) {
+ pr_crit("Error: invalid device tree blob"
+ " at physical address %p\n", (void *)dt_phys);
+
+ while (true)
+ cpu_relax();
+ }
+
+ done = 1;
+}
+#endif
+
void __init setup_arch(char **cmdline_p)
{
enable_mmu();