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Commit c530781c authored by John Crispin's avatar John Crispin Committed by Ralf Baechle
Browse files

MIPS: lantiq: add reset-controller api support 



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

Signed-off-by: default avatarJohn Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/8043/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 05637f10

arch/mips/Kconfig

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

arch/mips/lantiq/xway/reset.c

+61 −0
Original line number Diff line number Diff line
@@ -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();