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authorMichal Simek <monstr@monstr.eu>2009-10-02 12:48:47 +0200
committerMichal Simek <monstr@monstr.eu>2009-12-14 08:40:08 +0100
commit42a2478b789cb1b4335909e0fecc721c07be7d90 (patch)
tree1769ac33d86287054af07bbae99dca61140e3364 /arch/microblaze
parentf40542532e96dda5506eb76badea322f2ae4731c (diff)
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microblaze: GPIO reset support
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/setup.h2
-rw-r--r--arch/microblaze/kernel/Makefile2
-rw-r--r--arch/microblaze/kernel/reset.c138
-rw-r--r--arch/microblaze/kernel/setup.c29
-rw-r--r--arch/microblaze/platform/generic/system.dts28
-rw-r--r--arch/microblaze/platform/platform.c2
6 files changed, 171 insertions, 30 deletions
diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h
index ed67c9e..7f31394 100644
--- a/arch/microblaze/include/asm/setup.h
+++ b/arch/microblaze/include/asm/setup.h
@@ -35,6 +35,8 @@ extern void mmu_reset(void);
extern void early_console_reg_tlb_alloc(unsigned int addr);
# endif /* CONFIG_MMU */
+extern void of_platform_reset_gpio_probe(void);
+
void time_init(void);
void init_IRQ(void);
void machine_early_init(const char *cmdline, unsigned int ram,
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index d487729..fddd0c4 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -7,7 +7,7 @@ extra-y := head.o vmlinux.lds
obj-y += exceptions.o \
hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
of_platform.o process.o prom.o prom_parse.o ptrace.o \
- setup.o signal.o sys_microblaze.o timer.o traps.o
+ setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
obj-y += cpu/
diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c
new file mode 100644
index 0000000..ce74a6f
--- /dev/null
+++ b/arch/microblaze/kernel/reset.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2009 PetaLogix
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <asm/prom.h>
+
+/* Trigger specific functions */
+#ifdef CONFIG_GPIOLIB
+
+#include <linux/of_gpio.h>
+
+static int handle; /* reset pin handle */
+
+static int of_reset_gpio_handle(void)
+{
+ int ret; /* variable which stored handle reset gpio pin */
+ struct device_node *root; /* root node */
+ struct device_node *gpio; /* gpio node */
+ struct of_gpio_chip *of_gc = NULL;
+ enum of_gpio_flags flags ;
+ const void *gpio_spec;
+
+ /* find out root node */
+ root = of_find_node_by_path("/");
+
+ /* give me handle for gpio node to be possible allocate pin */
+ ret = of_parse_phandles_with_args(root, "hard-reset-gpios",
+ "#gpio-cells", 0, &gpio, &gpio_spec);
+ if (ret) {
+ pr_debug("%s: can't parse gpios property\n", __func__);
+ goto err0;
+ }
+
+ of_gc = gpio->data;
+ if (!of_gc) {
+ pr_debug("%s: gpio controller %s isn't registered\n",
+ root->full_name, gpio->full_name);
+ ret = -ENODEV;
+ goto err1;
+ }
+
+ ret = of_gc->xlate(of_gc, root, gpio_spec, &flags);
+ if (ret < 0)
+ goto err1;
+
+ ret += of_gc->gc.base;
+err1:
+ of_node_put(gpio);
+err0:
+ pr_debug("%s exited with status %d\n", __func__, ret);
+ return ret;
+}
+
+void of_platform_reset_gpio_probe(void)
+{
+ int ret;
+ handle = of_reset_gpio_handle();
+
+ if (!gpio_is_valid(handle)) {
+ printk(KERN_INFO "Skipping unavailable RESET gpio %d (%s)\n",
+ handle, "reset");
+ }
+
+ ret = gpio_request(handle, "reset");
+ if (ret < 0) {
+ printk(KERN_INFO "GPIO pin is already allocated\n");
+ return;
+ }
+
+ /* get current setup value */
+ ret = gpio_get_value(handle);
+ /* FIXME maybe worth to perform any action */
+ pr_debug("Reset: Gpio output state: 0x%x\n", ret);
+
+ /* Setup GPIO as output */
+ ret = gpio_direction_output(handle, 0);
+ if (ret < 0)
+ goto err;
+
+ /* Setup output direction */
+ gpio_set_value(handle, 0);
+
+ printk(KERN_INFO "Registered reset device: %d\n", handle);
+ return;
+err:
+ gpio_free(handle);
+ return;
+}
+
+
+static void gpio_system_reset(void)
+{
+ gpio_set_value(handle, 1);
+}
+#else
+#define gpio_system_reset() do {} while (0)
+void of_platform_reset_gpio_probe(void)
+{
+ return;
+}
+#endif
+
+void machine_restart(char *cmd)
+{
+ printk(KERN_NOTICE "Machine restart...\n");
+ gpio_system_reset();
+ dump_stack();
+ while (1)
+ ;
+}
+
+void machine_shutdown(void)
+{
+ printk(KERN_NOTICE "Machine shutdown...\n");
+ while (1)
+ ;
+}
+
+void machine_halt(void)
+{
+ printk(KERN_NOTICE "Machine halt...\n");
+ while (1)
+ ;
+}
+
+void machine_power_off(void)
+{
+ printk(KERN_NOTICE "Machine power off...\n");
+ while (1)
+ ;
+}
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c
index 8c1e0f4..367ad33 100644
--- a/arch/microblaze/kernel/setup.c
+++ b/arch/microblaze/kernel/setup.c
@@ -186,32 +186,3 @@ static int microblaze_debugfs_init(void)
}
arch_initcall(microblaze_debugfs_init);
#endif
-
-void machine_restart(char *cmd)
-{
- printk(KERN_NOTICE "Machine restart...\n");
- dump_stack();
- while (1)
- ;
-}
-
-void machine_shutdown(void)
-{
- printk(KERN_NOTICE "Machine shutdown...\n");
- while (1)
- ;
-}
-
-void machine_halt(void)
-{
- printk(KERN_NOTICE "Machine halt...\n");
- while (1)
- ;
-}
-
-void machine_power_off(void)
-{
- printk(KERN_NOTICE "Machine power off...\n");
- while (1)
- ;
-}
diff --git a/arch/microblaze/platform/generic/system.dts b/arch/microblaze/platform/generic/system.dts
index 29993f6..e00da89 100644
--- a/arch/microblaze/platform/generic/system.dts
+++ b/arch/microblaze/platform/generic/system.dts
@@ -32,6 +32,7 @@
#address-cells = <1>;
#size-cells = <1>;
compatible = "xlnx,microblaze";
+ hard-reset-gpios = <&LEDs_8Bit 2 1>;
model = "testing";
DDR2_SDRAM: memory@90000000 {
device_type = "memory";
@@ -261,6 +262,33 @@
xlnx,is-dual = <0x0>;
xlnx,tri-default = <0xffffffff>;
xlnx,tri-default-2 = <0xffffffff>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ } ;
+
+ gpio-leds {
+ compatible = "gpio-leds";
+
+ heartbeat {
+ label = "Heartbeat";
+ gpios = <&LEDs_8Bit 4 1>;
+ linux,default-trigger = "heartbeat";
+ };
+
+ yellow {
+ label = "Yellow";
+ gpios = <&LEDs_8Bit 5 1>;
+ };
+
+ red {
+ label = "Red";
+ gpios = <&LEDs_8Bit 6 1>;
+ };
+
+ green {
+ label = "Green";
+ gpios = <&LEDs_8Bit 7 1>;
+ };
} ;
RS232_Uart_1: serial@84000000 {
clock-frequency = <125000000>;
diff --git a/arch/microblaze/platform/platform.c b/arch/microblaze/platform/platform.c
index 56e0234..5b89b58 100644
--- a/arch/microblaze/platform/platform.c
+++ b/arch/microblaze/platform/platform.c
@@ -13,6 +13,7 @@
#include <linux/init.h>
#include <linux/of_platform.h>
#include <asm/prom.h>
+#include <asm/setup.h>
static struct of_device_id xilinx_of_bus_ids[] __initdata = {
{ .compatible = "simple-bus", },
@@ -26,6 +27,7 @@ static struct of_device_id xilinx_of_bus_ids[] __initdata = {
static int __init microblaze_device_probe(void)
{
of_platform_bus_probe(NULL, xilinx_of_bus_ids, NULL);
+ of_platform_reset_gpio_probe();
return 0;
}
device_initcall(microblaze_device_probe);