microblaze: GPIO reset support

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-10-02 12:48:47 +02:00
parent f40542532e
commit 42a2478b78
6 changed files with 171 additions and 30 deletions

View file

@ -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,

View file

@ -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/

View file

@ -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)
;
}

View file

@ -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)
;
}

View file

@ -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>;

View file

@ -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);