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136 lines
3.3 KiB
136 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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*/ |
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#include <linux/init.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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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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builtin_platform_driver(pistachio_reset_driver);
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