75a6faf617
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 101 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190113.822954939@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Pistachio SoC Reset Controller driver
|
|
*
|
|
* Copyright (C) 2015 Imagination Technologies Ltd.
|
|
*
|
|
* Author: Damien Horsley <Damien.Horsley@imgtec.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#include <dt-bindings/reset/pistachio-resets.h>
|
|
|
|
#define PISTACHIO_SOFT_RESET 0
|
|
|
|
struct pistachio_reset_data {
|
|
struct reset_controller_dev rcdev;
|
|
struct regmap *periph_regs;
|
|
};
|
|
|
|
static inline int pistachio_reset_shift(unsigned long id)
|
|
{
|
|
switch (id) {
|
|
case PISTACHIO_RESET_I2C0:
|
|
case PISTACHIO_RESET_I2C1:
|
|
case PISTACHIO_RESET_I2C2:
|
|
case PISTACHIO_RESET_I2C3:
|
|
case PISTACHIO_RESET_I2S_IN:
|
|
case PISTACHIO_RESET_PRL_OUT:
|
|
case PISTACHIO_RESET_SPDIF_OUT:
|
|
case PISTACHIO_RESET_SPI:
|
|
case PISTACHIO_RESET_PWM_PDM:
|
|
case PISTACHIO_RESET_UART0:
|
|
case PISTACHIO_RESET_UART1:
|
|
case PISTACHIO_RESET_QSPI:
|
|
case PISTACHIO_RESET_MDC:
|
|
case PISTACHIO_RESET_SDHOST:
|
|
case PISTACHIO_RESET_ETHERNET:
|
|
case PISTACHIO_RESET_IR:
|
|
case PISTACHIO_RESET_HASH:
|
|
case PISTACHIO_RESET_TIMER:
|
|
return id;
|
|
case PISTACHIO_RESET_I2S_OUT:
|
|
case PISTACHIO_RESET_SPDIF_IN:
|
|
case PISTACHIO_RESET_EVT:
|
|
return id + 6;
|
|
case PISTACHIO_RESET_USB_H:
|
|
case PISTACHIO_RESET_USB_PR:
|
|
case PISTACHIO_RESET_USB_PHY_PR:
|
|
case PISTACHIO_RESET_USB_PHY_PON:
|
|
return id + 7;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int pistachio_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct pistachio_reset_data *rd;
|
|
u32 mask;
|
|
int shift;
|
|
|
|
rd = container_of(rcdev, struct pistachio_reset_data, rcdev);
|
|
shift = pistachio_reset_shift(id);
|
|
if (shift < 0)
|
|
return shift;
|
|
mask = BIT(shift);
|
|
|
|
return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET,
|
|
mask, mask);
|
|
}
|
|
|
|
static int pistachio_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct pistachio_reset_data *rd;
|
|
u32 mask;
|
|
int shift;
|
|
|
|
rd = container_of(rcdev, struct pistachio_reset_data, rcdev);
|
|
shift = pistachio_reset_shift(id);
|
|
if (shift < 0)
|
|
return shift;
|
|
mask = BIT(shift);
|
|
|
|
return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET,
|
|
mask, 0);
|
|
}
|
|
|
|
static const struct reset_control_ops pistachio_reset_ops = {
|
|
.assert = pistachio_reset_assert,
|
|
.deassert = pistachio_reset_deassert,
|
|
};
|
|
|
|
static int pistachio_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct pistachio_reset_data *rd;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
|
|
rd = devm_kzalloc(dev, sizeof(*rd), GFP_KERNEL);
|
|
if (!rd)
|
|
return -ENOMEM;
|
|
|
|
rd->periph_regs = syscon_node_to_regmap(np->parent);
|
|
if (IS_ERR(rd->periph_regs))
|
|
return PTR_ERR(rd->periph_regs);
|
|
|
|
rd->rcdev.owner = THIS_MODULE;
|
|
rd->rcdev.nr_resets = PISTACHIO_RESET_MAX + 1;
|
|
rd->rcdev.ops = &pistachio_reset_ops;
|
|
rd->rcdev.of_node = np;
|
|
|
|
return devm_reset_controller_register(dev, &rd->rcdev);
|
|
}
|
|
|
|
static const struct of_device_id pistachio_reset_dt_ids[] = {
|
|
{ .compatible = "img,pistachio-reset", },
|
|
{ /* sentinel */ },
|
|
};
|
|
|
|
static struct platform_driver pistachio_reset_driver = {
|
|
.probe = pistachio_reset_probe,
|
|
.driver = {
|
|
.name = "pistachio-reset",
|
|
.of_match_table = pistachio_reset_dt_ids,
|
|
},
|
|
};
|
|
builtin_platform_driver(pistachio_reset_driver);
|