MIPS: lantiq: add reset-controller api support

Add a reset-controller binding for the reset registers found on the lantiq
SoC.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/8043/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
John Crispin 2013-09-03 13:18:12 +02:00 коммит произвёл Ralf Baechle
Родитель 05637f10e7
Коммит c530781c93
2 изменённых файлов: 63 добавлений и 0 удалений

Просмотреть файл

@ -296,6 +296,8 @@ config LANTIQ
select USE_OF
select PINCTRL
select PINCTRL_LANTIQ
select ARCH_HAS_RESET_CONTROLLER
select RESET_CONTROLLER
config LASAT
bool "LASAT Networks platforms"

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@ -14,6 +14,7 @@
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/reset-controller.h>
#include <asm/reboot.h>
@ -113,6 +114,66 @@ void ltq_reset_once(unsigned int module, ulong u)
ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
}
static int ltq_assert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = ltq_rcu_r32(RCU_RST_REQ);
val |= BIT(id);
ltq_rcu_w32(val, RCU_RST_REQ);
return 0;
}
static int ltq_deassert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = ltq_rcu_r32(RCU_RST_REQ);
val &= ~BIT(id);
ltq_rcu_w32(val, RCU_RST_REQ);
return 0;
}
static int ltq_reset_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
ltq_assert_device(rcdev, id);
return ltq_deassert_device(rcdev, id);
}
static struct reset_control_ops reset_ops = {
.reset = ltq_reset_device,
.assert = ltq_assert_device,
.deassert = ltq_deassert_device,
};
static struct reset_controller_dev reset_dev = {
.ops = &reset_ops,
.owner = THIS_MODULE,
.nr_resets = 32,
.of_reset_n_cells = 1,
};
void ltq_rst_init(void)
{
reset_dev.of_node = of_find_compatible_node(NULL, NULL,
"lantiq,xway-reset");
if (!reset_dev.of_node)
pr_err("Failed to find reset controller node");
else
reset_controller_register(&reset_dev);
}
static void ltq_machine_restart(char *command)
{
local_irq_disable();