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Commit 2a153f1c authored by John Crispin's avatar John Crispin Committed by Ralf Baechle
Browse files

MIPS: ralink: Add support for reset-controller API 



Add a helper for reseting different devices on the SoC.

Signed-off-by: default avatarJohn 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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9852ba6a

arch/mips/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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)"

arch/mips/ralink/common.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

arch/mips/ralink/of.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

}

arch/mips/ralink/reset.c

+62 −0
Original line number Diff line number Diff line
@@ -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();