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MIPS: ralink: Add support for reset-controller API

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Add a helper for reseting different devices on the SoC.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5804/
Patchwork: https://patchwork.linux-mips.org/patch/5797/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
John Crispin 2013-09-04 00:16:59 +02:00 committed by Ralf Baechle
parent 9852ba6a91
commit 2a153f1c55
4 changed files with 69 additions and 0 deletions
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2
arch/mips/Kconfig
View File

@ -446,6 +446,8 @@ config RALINK
select SYS_HAS_EARLY_PRINTK
select HAVE_MACH_CLKDEV
select CLKDEV_LOOKUP
select ARCH_HAS_RESET_CONTROLLER
select RESET_CONTROLLER
config SGI_IP22
bool "SGI IP22 (Indy/Indigo2)"

2
arch/mips/ralink/common.h
View File

@ -46,6 +46,8 @@ extern void ralink_of_remap(void);
extern void ralink_clk_init(void);
extern void ralink_clk_add(const char *dev, unsigned long rate);
extern void ralink_rst_init(void);
extern void prom_soc_init(struct ralink_soc_info *soc_info);
__iomem void *plat_of_remap_node(const char *node);

3
arch/mips/ralink/of.c
View File

@ -110,6 +110,9 @@ static int __init plat_of_setup(void)
if (of_platform_populate(NULL, of_ids, NULL, NULL))
panic("failed to populate DT\n");
/* make sure ithat the reset controller is setup early */
ralink_rst_init();
return 0;
}

62
arch/mips/ralink/reset.c
View File

@ -10,6 +10,8 @@
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/reset-controller.h>
#include <asm/reboot.h>
@ -19,6 +21,66 @@
#define SYSC_REG_RESET_CTRL 0x034
#define RSTCTL_RESET_SYSTEM BIT(0)
static int ralink_assert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
val |= BIT(id);
rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
return 0;
}
static int ralink_deassert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
val &= ~BIT(id);
rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
return 0;
}
static int ralink_reset_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
ralink_assert_device(rcdev, id);
return ralink_deassert_device(rcdev, id);
}
static struct reset_control_ops reset_ops = {
.reset = ralink_reset_device,
.assert = ralink_assert_device,
.deassert = ralink_deassert_device,
};
static struct reset_controller_dev reset_dev = {
.ops = &reset_ops,
.owner = THIS_MODULE,
.nr_resets = 32,
.of_reset_n_cells = 1,
};
void ralink_rst_init(void)
{
reset_dev.of_node = of_find_compatible_node(NULL, NULL,
"ralink,rt2880-reset");
if (!reset_dev.of_node)
pr_err("Failed to find reset controller node");
else
reset_controller_register(&reset_dev);
}
static void ralink_restart(char *command)
{
local_irq_disable();