145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*
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* Pistachio SoC Reset Controller driver
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*
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* Copyright (C) 2015 Imagination Technologies Ltd.
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*
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* Author: Damien Horsley <Damien.Horsley@imgtec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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#include <linux/slab.h>
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#include <linux/mfd/syscon.h>
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#include <dt-bindings/reset/pistachio-resets.h>
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#define PISTACHIO_SOFT_RESET 0
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struct pistachio_reset_data {
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struct reset_controller_dev rcdev;
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struct regmap *periph_regs;
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};
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static inline int pistachio_reset_shift(unsigned long id)
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{
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switch (id) {
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case PISTACHIO_RESET_I2C0:
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case PISTACHIO_RESET_I2C1:
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case PISTACHIO_RESET_I2C2:
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case PISTACHIO_RESET_I2C3:
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case PISTACHIO_RESET_I2S_IN:
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case PISTACHIO_RESET_PRL_OUT:
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case PISTACHIO_RESET_SPDIF_OUT:
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case PISTACHIO_RESET_SPI:
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case PISTACHIO_RESET_PWM_PDM:
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case PISTACHIO_RESET_UART0:
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case PISTACHIO_RESET_UART1:
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case PISTACHIO_RESET_QSPI:
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case PISTACHIO_RESET_MDC:
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case PISTACHIO_RESET_SDHOST:
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case PISTACHIO_RESET_ETHERNET:
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case PISTACHIO_RESET_IR:
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case PISTACHIO_RESET_HASH:
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case PISTACHIO_RESET_TIMER:
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return id;
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case PISTACHIO_RESET_I2S_OUT:
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case PISTACHIO_RESET_SPDIF_IN:
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case PISTACHIO_RESET_EVT:
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return id + 6;
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case PISTACHIO_RESET_USB_H:
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case PISTACHIO_RESET_USB_PR:
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case PISTACHIO_RESET_USB_PHY_PR:
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case PISTACHIO_RESET_USB_PHY_PON:
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return id + 7;
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default:
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return -EINVAL;
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}
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}
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static int pistachio_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct pistachio_reset_data *rd;
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u32 mask;
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int shift;
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rd = container_of(rcdev, struct pistachio_reset_data, rcdev);
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shift = pistachio_reset_shift(id);
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if (shift < 0)
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return shift;
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mask = BIT(shift);
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return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET,
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mask, mask);
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}
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static int pistachio_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct pistachio_reset_data *rd;
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u32 mask;
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int shift;
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rd = container_of(rcdev, struct pistachio_reset_data, rcdev);
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shift = pistachio_reset_shift(id);
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if (shift < 0)
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return shift;
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mask = BIT(shift);
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return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET,
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mask, 0);
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}
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static const struct reset_control_ops pistachio_reset_ops = {
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.assert = pistachio_reset_assert,
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.deassert = pistachio_reset_deassert,
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};
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static int pistachio_reset_probe(struct platform_device *pdev)
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{
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struct pistachio_reset_data *rd;
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struct device *dev = &pdev->dev;
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struct device_node *np = pdev->dev.of_node;
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rd = devm_kzalloc(dev, sizeof(*rd), GFP_KERNEL);
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if (!rd)
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return -ENOMEM;
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rd->periph_regs = syscon_node_to_regmap(np->parent);
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if (IS_ERR(rd->periph_regs))
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return PTR_ERR(rd->periph_regs);
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rd->rcdev.owner = THIS_MODULE;
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rd->rcdev.nr_resets = PISTACHIO_RESET_MAX + 1;
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rd->rcdev.ops = &pistachio_reset_ops;
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rd->rcdev.of_node = np;
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return devm_reset_controller_register(dev, &rd->rcdev);
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}
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static const struct of_device_id pistachio_reset_dt_ids[] = {
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{ .compatible = "img,pistachio-reset", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, pistachio_reset_dt_ids);
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static struct platform_driver pistachio_reset_driver = {
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.probe = pistachio_reset_probe,
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.driver = {
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.name = "pistachio-reset",
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.of_match_table = pistachio_reset_dt_ids,
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},
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};
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module_platform_driver(pistachio_reset_driver);
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MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
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MODULE_DESCRIPTION("Pistacho Reset Controller Driver");
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MODULE_LICENSE("GPL v2");
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