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127 lines
3.2 KiB
127 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright Intel Corporation (C) 2017. All Rights Reserved |
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* |
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* Reset driver for Altera Arria10 MAX5 System Resource Chip |
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* |
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* Adapted from reset-socfpga.c |
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*/ |
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#include <linux/err.h> |
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#include <linux/mfd/altera-a10sr.h> |
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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/reset-controller.h> |
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#include <dt-bindings/reset/altr,rst-mgr-a10sr.h> |
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struct a10sr_reset { |
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struct reset_controller_dev rcdev; |
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struct regmap *regmap; |
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}; |
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static inline struct a10sr_reset *to_a10sr_rst(struct reset_controller_dev *rc) |
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{ |
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return container_of(rc, struct a10sr_reset, rcdev); |
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} |
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static inline int a10sr_reset_shift(unsigned long id) |
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{ |
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switch (id) { |
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case A10SR_RESET_ENET_HPS: |
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return 1; |
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case A10SR_RESET_PCIE: |
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case A10SR_RESET_FILE: |
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case A10SR_RESET_BQSPI: |
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case A10SR_RESET_USB: |
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return id + 11; |
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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 a10sr_reset_update(struct reset_controller_dev *rcdev, |
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unsigned long id, bool assert) |
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{ |
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struct a10sr_reset *a10r = to_a10sr_rst(rcdev); |
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int offset = a10sr_reset_shift(id); |
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u8 mask = ALTR_A10SR_REG_BIT_MASK(offset); |
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int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset); |
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return regmap_update_bits(a10r->regmap, index, mask, assert ? 0 : mask); |
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} |
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static int a10sr_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return a10sr_reset_update(rcdev, id, true); |
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} |
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static int a10sr_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return a10sr_reset_update(rcdev, id, false); |
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} |
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static int a10sr_reset_status(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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int ret; |
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struct a10sr_reset *a10r = to_a10sr_rst(rcdev); |
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int offset = a10sr_reset_shift(id); |
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u8 mask = ALTR_A10SR_REG_BIT_MASK(offset); |
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int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset); |
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unsigned int value; |
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ret = regmap_read(a10r->regmap, index, &value); |
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if (ret < 0) |
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return ret; |
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return !!(value & mask); |
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} |
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static const struct reset_control_ops a10sr_reset_ops = { |
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.assert = a10sr_reset_assert, |
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.deassert = a10sr_reset_deassert, |
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.status = a10sr_reset_status, |
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}; |
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static int a10sr_reset_probe(struct platform_device *pdev) |
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{ |
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struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent); |
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struct a10sr_reset *a10r; |
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a10r = devm_kzalloc(&pdev->dev, sizeof(struct a10sr_reset), |
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GFP_KERNEL); |
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if (!a10r) |
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return -ENOMEM; |
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a10r->rcdev.owner = THIS_MODULE; |
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a10r->rcdev.nr_resets = A10SR_RESET_NUM; |
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a10r->rcdev.ops = &a10sr_reset_ops; |
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a10r->rcdev.of_node = pdev->dev.of_node; |
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a10r->regmap = a10sr->regmap; |
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platform_set_drvdata(pdev, a10r); |
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return devm_reset_controller_register(&pdev->dev, &a10r->rcdev); |
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} |
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static const struct of_device_id a10sr_reset_of_match[] = { |
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{ .compatible = "altr,a10sr-reset" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, a10sr_reset_of_match); |
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static struct platform_driver a10sr_reset_driver = { |
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.probe = a10sr_reset_probe, |
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.driver = { |
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.name = "altr_a10sr_reset", |
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}, |
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}; |
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module_platform_driver(a10sr_reset_driver); |
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MODULE_AUTHOR("Thor Thayer <[email protected]>"); |
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MODULE_DESCRIPTION("Altera Arria10 System Resource Reset Controller Driver"); |
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MODULE_LICENSE("GPL v2");
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