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authorAlexander Shiyan <shc_work@mail.ru>2016-06-04 10:10:03 +0300
committerArnd Bergmann <arnd@arndb.de>2016-07-06 17:38:54 +0200
commit0db943ec029a1ced48c71617706a1e8d782c9676 (patch)
treefae3c7b665cef929d895543d2fd727b2a100fb26 /arch/arm/mach-clps711x
parent32981ea5b98682a70fdd27f2246fcd2c4e10126b (diff)
downloadlinux-0db943ec029a1ced48c71617706a1e8d782c9676.tar.bz2
ARM: clps711x: Add basic DT support
This patch adds basic support to run Cirrus Logic ARMv4T CPUs with device-tree support. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-clps711x')
-rw-r--r--arch/arm/mach-clps711x/Kconfig9
-rw-r--r--arch/arm/mach-clps711x/Makefile1
-rw-r--r--arch/arm/mach-clps711x/board-dt.c82
3 files changed, 92 insertions, 0 deletions
diff --git a/arch/arm/mach-clps711x/Kconfig b/arch/arm/mach-clps711x/Kconfig
index f711498c180c..f21700cf61f4 100644
--- a/arch/arm/mach-clps711x/Kconfig
+++ b/arch/arm/mach-clps711x/Kconfig
@@ -2,6 +2,15 @@ if ARCH_CLPS711X
menu "CLPS711X/EP721X/EP731X Implementations"
+config MACH_CLPS711X_DT
+ bool "Device-tree support"
+ select CLKSRC_OF
+ select OF_IRQ
+ select USE_OF
+ help
+ Select this if you want to experiment device-tree with
+ ARMv4T Cirrus Logic chips.
+
config ARCH_AUTCPU12
bool "AUTCPU12"
help
diff --git a/arch/arm/mach-clps711x/Makefile b/arch/arm/mach-clps711x/Makefile
index f04151efd96a..ef6df40214b7 100644
--- a/arch/arm/mach-clps711x/Makefile
+++ b/arch/arm/mach-clps711x/Makefile
@@ -6,6 +6,7 @@
obj-y := common.o devices.o
+obj-$(CONFIG_MACH_CLPS711X_DT) += board-dt.o
obj-$(CONFIG_ARCH_AUTCPU12) += board-autcpu12.o
obj-$(CONFIG_ARCH_CDB89712) += board-cdb89712.o
obj-$(CONFIG_ARCH_CLEP7312) += board-clep7312.o
diff --git a/arch/arm/mach-clps711x/board-dt.c b/arch/arm/mach-clps711x/board-dt.c
new file mode 100644
index 000000000000..ee1f83b1a332
--- /dev/null
+++ b/arch/arm/mach-clps711x/board-dt.c
@@ -0,0 +1,82 @@
+/*
+ * Author: Alexander Shiyan <shc_work@mail.ru>, 2016
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/io.h>
+#include <linux/of_fdt.h>
+#include <linux/platform_device.h>
+#include <linux/random.h>
+#include <linux/sizes.h>
+
+#include <linux/mfd/syscon/clps711x.h>
+
+#include <asm/system_info.h>
+#include <asm/system_misc.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#define CLPS711X_VIRT_BASE IOMEM(0xfeff4000)
+#define CLPS711X_PHYS_BASE (0x80000000)
+# define SYSFLG1 (0x0140)
+# define HALT (0x0800)
+# define UNIQID (0x2440)
+# define RANDID0 (0x2700)
+# define RANDID1 (0x2704)
+# define RANDID2 (0x2708)
+# define RANDID3 (0x270c)
+
+static struct map_desc clps711x_io_desc __initdata = {
+ .virtual = (unsigned long)CLPS711X_VIRT_BASE,
+ .pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
+ .length = 48 * SZ_1K,
+ .type = MT_DEVICE,
+};
+
+static void __init clps711x_map_io(void)
+{
+ iotable_init(&clps711x_io_desc, 1);
+}
+
+static const struct resource clps711x_cpuidle_res =
+ DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
+
+static void __init clps711x_init(void)
+{
+ u32 id[5];
+
+ id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
+ id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
+ id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
+ id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
+ id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
+ system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
+
+ add_device_randomness(id, sizeof(id));
+
+ system_serial_low = id[0];
+
+ platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
+ &clps711x_cpuidle_res, 1);
+}
+
+static void clps711x_restart(enum reboot_mode mode, const char *cmd)
+{
+ soft_restart(0);
+}
+
+static const char *clps711x_compat[] __initconst = {
+ "cirrus,ep7209",
+ NULL
+};
+
+DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
+ .dt_compat = clps711x_compat,
+ .map_io = clps711x_map_io,
+ .init_late = clps711x_init,
+ .restart = clps711x_restart,
+MACHINE_END