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75a6faf6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
8a56736a DH |
2 | /* |
3 | * Pistachio SoC Reset Controller driver | |
4 | * | |
5 | * Copyright (C) 2015 Imagination Technologies Ltd. | |
6 | * | |
7 | * Author: Damien Horsley <Damien.Horsley@imgtec.com> | |
8a56736a DH |
8 | */ |
9 | ||
01db1cb1 | 10 | #include <linux/init.h> |
8a56736a DH |
11 | #include <linux/of.h> |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/regmap.h> | |
14 | #include <linux/reset-controller.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mfd/syscon.h> | |
17 | ||
18 | #include <dt-bindings/reset/pistachio-resets.h> | |
19 | ||
20 | #define PISTACHIO_SOFT_RESET 0 | |
21 | ||
22 | struct pistachio_reset_data { | |
23 | struct reset_controller_dev rcdev; | |
24 | struct regmap *periph_regs; | |
25 | }; | |
26 | ||
27 | static inline int pistachio_reset_shift(unsigned long id) | |
28 | { | |
29 | switch (id) { | |
30 | case PISTACHIO_RESET_I2C0: | |
31 | case PISTACHIO_RESET_I2C1: | |
32 | case PISTACHIO_RESET_I2C2: | |
33 | case PISTACHIO_RESET_I2C3: | |
34 | case PISTACHIO_RESET_I2S_IN: | |
35 | case PISTACHIO_RESET_PRL_OUT: | |
36 | case PISTACHIO_RESET_SPDIF_OUT: | |
37 | case PISTACHIO_RESET_SPI: | |
38 | case PISTACHIO_RESET_PWM_PDM: | |
39 | case PISTACHIO_RESET_UART0: | |
40 | case PISTACHIO_RESET_UART1: | |
41 | case PISTACHIO_RESET_QSPI: | |
42 | case PISTACHIO_RESET_MDC: | |
43 | case PISTACHIO_RESET_SDHOST: | |
44 | case PISTACHIO_RESET_ETHERNET: | |
45 | case PISTACHIO_RESET_IR: | |
46 | case PISTACHIO_RESET_HASH: | |
47 | case PISTACHIO_RESET_TIMER: | |
48 | return id; | |
49 | case PISTACHIO_RESET_I2S_OUT: | |
50 | case PISTACHIO_RESET_SPDIF_IN: | |
51 | case PISTACHIO_RESET_EVT: | |
52 | return id + 6; | |
53 | case PISTACHIO_RESET_USB_H: | |
54 | case PISTACHIO_RESET_USB_PR: | |
55 | case PISTACHIO_RESET_USB_PHY_PR: | |
56 | case PISTACHIO_RESET_USB_PHY_PON: | |
57 | return id + 7; | |
58 | default: | |
59 | return -EINVAL; | |
60 | } | |
61 | } | |
62 | ||
63 | static int pistachio_reset_assert(struct reset_controller_dev *rcdev, | |
64 | unsigned long id) | |
65 | { | |
66 | struct pistachio_reset_data *rd; | |
67 | u32 mask; | |
68 | int shift; | |
69 | ||
70 | rd = container_of(rcdev, struct pistachio_reset_data, rcdev); | |
71 | shift = pistachio_reset_shift(id); | |
72 | if (shift < 0) | |
73 | return shift; | |
74 | mask = BIT(shift); | |
75 | ||
76 | return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET, | |
77 | mask, mask); | |
78 | } | |
79 | ||
80 | static int pistachio_reset_deassert(struct reset_controller_dev *rcdev, | |
81 | unsigned long id) | |
82 | { | |
83 | struct pistachio_reset_data *rd; | |
84 | u32 mask; | |
85 | int shift; | |
86 | ||
87 | rd = container_of(rcdev, struct pistachio_reset_data, rcdev); | |
88 | shift = pistachio_reset_shift(id); | |
89 | if (shift < 0) | |
90 | return shift; | |
91 | mask = BIT(shift); | |
92 | ||
93 | return regmap_update_bits(rd->periph_regs, PISTACHIO_SOFT_RESET, | |
94 | mask, 0); | |
95 | } | |
96 | ||
c0cc2609 | 97 | static const struct reset_control_ops pistachio_reset_ops = { |
8a56736a DH |
98 | .assert = pistachio_reset_assert, |
99 | .deassert = pistachio_reset_deassert, | |
100 | }; | |
101 | ||
102 | static int pistachio_reset_probe(struct platform_device *pdev) | |
103 | { | |
104 | struct pistachio_reset_data *rd; | |
105 | struct device *dev = &pdev->dev; | |
106 | struct device_node *np = pdev->dev.of_node; | |
107 | ||
108 | rd = devm_kzalloc(dev, sizeof(*rd), GFP_KERNEL); | |
109 | if (!rd) | |
110 | return -ENOMEM; | |
111 | ||
112 | rd->periph_regs = syscon_node_to_regmap(np->parent); | |
113 | if (IS_ERR(rd->periph_regs)) | |
114 | return PTR_ERR(rd->periph_regs); | |
115 | ||
116 | rd->rcdev.owner = THIS_MODULE; | |
117 | rd->rcdev.nr_resets = PISTACHIO_RESET_MAX + 1; | |
118 | rd->rcdev.ops = &pistachio_reset_ops; | |
119 | rd->rcdev.of_node = np; | |
120 | ||
1b1447f4 | 121 | return devm_reset_controller_register(dev, &rd->rcdev); |
8a56736a DH |
122 | } |
123 | ||
124 | static const struct of_device_id pistachio_reset_dt_ids[] = { | |
125 | { .compatible = "img,pistachio-reset", }, | |
126 | { /* sentinel */ }, | |
127 | }; | |
8a56736a DH |
128 | |
129 | static struct platform_driver pistachio_reset_driver = { | |
130 | .probe = pistachio_reset_probe, | |
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131 | .driver = { |
132 | .name = "pistachio-reset", | |
133 | .of_match_table = pistachio_reset_dt_ids, | |
134 | }, | |
135 | }; | |
01db1cb1 | 136 | builtin_platform_driver(pistachio_reset_driver); |