projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f59d23c2 CF |
1 | /* |
| 2 | * Hisilicon Hi6220 reset controller driver | |
| 3 | * | |
| 4 | * Copyright (c) 2015 Hisilicon Limited. | |
| 5 | * | |
| 6 | * Author: Feng Chen <puck.chen@hisilicon.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/io.h> | |
| 14 | #include <linux/init.h> | |
| 70b3590f | 15 | #include <linux/module.h> |
| f59d23c2 CF |
16 | #include <linux/bitops.h> |
| 17 | #include <linux/of.h> | |
| 18 | #include <linux/reset-controller.h> | |
| 19 | #include <linux/reset.h> | |
| 20 | #include <linux/platform_device.h> | |
| 21 | ||
| 22 | #define ASSERT_OFFSET 0x300 | |
| 23 | #define DEASSERT_OFFSET 0x304 | |
| 24 | #define MAX_INDEX 0x509 | |
| 25 | ||
| 26 | #define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev) | |
| 27 | ||
| 28 | struct hi6220_reset_data { | |
| 29 | void __iomem *assert_base; | |
| 30 | void __iomem *deassert_base; | |
| 31 | struct reset_controller_dev rc_dev; | |
| 32 | }; | |
| 33 | ||
| 34 | static int hi6220_reset_assert(struct reset_controller_dev *rc_dev, | |
| 35 | unsigned long idx) | |
| 36 | { | |
| 37 | struct hi6220_reset_data *data = to_reset_data(rc_dev); | |
| 38 | ||
| 39 | int bank = idx >> 8; | |
| 40 | int offset = idx & 0xff; | |
| 41 | ||
| 42 | writel(BIT(offset), data->assert_base + (bank * 0x10)); | |
| 43 | ||
| 44 | return 0; | |
| 45 | } | |
| 46 | ||
| 47 | static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev, | |
| 48 | unsigned long idx) | |
| 49 | { | |
| 50 | struct hi6220_reset_data *data = to_reset_data(rc_dev); | |
| 51 | ||
| 52 | int bank = idx >> 8; | |
| 53 | int offset = idx & 0xff; | |
| 54 | ||
| 55 | writel(BIT(offset), data->deassert_base + (bank * 0x10)); | |
| 56 | ||
| 57 | return 0; | |
| 58 | } | |
| 59 | ||
| 0e18e60e | 60 | static const struct reset_control_ops hi6220_reset_ops = { |
| f59d23c2 CF |
61 | .assert = hi6220_reset_assert, |
| 62 | .deassert = hi6220_reset_deassert, | |
| 63 | }; | |
| 64 | ||
| 65 | static int hi6220_reset_probe(struct platform_device *pdev) | |
| 66 | { | |
| 67 | struct hi6220_reset_data *data; | |
| 68 | struct resource *res; | |
| 69 | void __iomem *src_base; | |
| 70 | ||
| 71 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
| 72 | if (!data) | |
| 73 | return -ENOMEM; | |
| 74 | ||
| 75 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 76 | src_base = devm_ioremap_resource(&pdev->dev, res); | |
| 77 | if (IS_ERR(src_base)) | |
| 78 | return PTR_ERR(src_base); | |
| 79 | ||
| 80 | data->assert_base = src_base + ASSERT_OFFSET; | |
| 81 | data->deassert_base = src_base + DEASSERT_OFFSET; | |
| 82 | data->rc_dev.nr_resets = MAX_INDEX; | |
| 83 | data->rc_dev.ops = &hi6220_reset_ops; | |
| 84 | data->rc_dev.of_node = pdev->dev.of_node; | |
| 85 | ||
| c41ef91f | 86 | return reset_controller_register(&data->rc_dev); |
| f59d23c2 CF |
87 | } |
| 88 | ||
| 89 | static const struct of_device_id hi6220_reset_match[] = { | |
| 90 | { .compatible = "hisilicon,hi6220-sysctrl" }, | |
| 91 | { }, | |
| 92 | }; | |
| 93 | ||
| 94 | static struct platform_driver hi6220_reset_driver = { | |
| 95 | .probe = hi6220_reset_probe, | |
| 96 | .driver = { | |
| 97 | .name = "reset-hi6220", | |
| 98 | .of_match_table = hi6220_reset_match, | |
| 99 | }, | |
| 100 | }; | |
| 101 | ||
| 102 | static int __init hi6220_reset_init(void) | |
| 103 | { | |
| 104 | return platform_driver_register(&hi6220_reset_driver); | |
| 105 | } | |
| 106 | ||
| 107 | postcore_initcall(hi6220_reset_init); |