Merge tag 'backlight-next-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/lee...
[platform/kernel/linux-rpi.git] / drivers / reset / reset-ma35d1.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2023 Nuvoton Technology Corp.
4  * Author: Chi-Fang Li <cfli0@nuvoton.com>
5  */
6
7 #include <linux/bits.h>
8 #include <linux/container_of.h>
9 #include <linux/device.h>
10 #include <linux/err.h>
11 #include <linux/io.h>
12 #include <linux/kernel.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/reboot.h>
16 #include <linux/reset-controller.h>
17 #include <linux/spinlock.h>
18 #include <dt-bindings/reset/nuvoton,ma35d1-reset.h>
19
20 struct ma35d1_reset_data {
21         struct reset_controller_dev rcdev;
22         struct notifier_block restart_handler;
23         void __iomem *base;
24         /* protect registers against concurrent read-modify-write */
25         spinlock_t lock;
26 };
27
28 static const struct {
29         u32 reg_ofs;
30         u32 bit;
31 } ma35d1_reset_map[] = {
32         [MA35D1_RESET_CHIP] =    {0x20, 0},
33         [MA35D1_RESET_CA35CR0] = {0x20, 1},
34         [MA35D1_RESET_CA35CR1] = {0x20, 2},
35         [MA35D1_RESET_CM4] =     {0x20, 3},
36         [MA35D1_RESET_PDMA0] =   {0x20, 4},
37         [MA35D1_RESET_PDMA1] =   {0x20, 5},
38         [MA35D1_RESET_PDMA2] =   {0x20, 6},
39         [MA35D1_RESET_PDMA3] =   {0x20, 7},
40         [MA35D1_RESET_DISP] =    {0x20, 9},
41         [MA35D1_RESET_VCAP0] =   {0x20, 10},
42         [MA35D1_RESET_VCAP1] =   {0x20, 11},
43         [MA35D1_RESET_GFX] =     {0x20, 12},
44         [MA35D1_RESET_VDEC] =    {0x20, 13},
45         [MA35D1_RESET_WHC0] =    {0x20, 14},
46         [MA35D1_RESET_WHC1] =    {0x20, 15},
47         [MA35D1_RESET_GMAC0] =   {0x20, 16},
48         [MA35D1_RESET_GMAC1] =   {0x20, 17},
49         [MA35D1_RESET_HWSEM] =   {0x20, 18},
50         [MA35D1_RESET_EBI] =     {0x20, 19},
51         [MA35D1_RESET_HSUSBH0] = {0x20, 20},
52         [MA35D1_RESET_HSUSBH1] = {0x20, 21},
53         [MA35D1_RESET_HSUSBD] =  {0x20, 22},
54         [MA35D1_RESET_USBHL] =   {0x20, 23},
55         [MA35D1_RESET_SDH0] =    {0x20, 24},
56         [MA35D1_RESET_SDH1] =    {0x20, 25},
57         [MA35D1_RESET_NAND] =    {0x20, 26},
58         [MA35D1_RESET_GPIO] =    {0x20, 27},
59         [MA35D1_RESET_MCTLP] =   {0x20, 28},
60         [MA35D1_RESET_MCTLC] =   {0x20, 29},
61         [MA35D1_RESET_DDRPUB] =  {0x20, 30},
62         [MA35D1_RESET_TMR0] =    {0x24, 2},
63         [MA35D1_RESET_TMR1] =    {0x24, 3},
64         [MA35D1_RESET_TMR2] =    {0x24, 4},
65         [MA35D1_RESET_TMR3] =    {0x24, 5},
66         [MA35D1_RESET_I2C0] =    {0x24, 8},
67         [MA35D1_RESET_I2C1] =    {0x24, 9},
68         [MA35D1_RESET_I2C2] =    {0x24, 10},
69         [MA35D1_RESET_I2C3] =    {0x24, 11},
70         [MA35D1_RESET_QSPI0] =   {0x24, 12},
71         [MA35D1_RESET_SPI0] =    {0x24, 13},
72         [MA35D1_RESET_SPI1] =    {0x24, 14},
73         [MA35D1_RESET_SPI2] =    {0x24, 15},
74         [MA35D1_RESET_UART0] =   {0x24, 16},
75         [MA35D1_RESET_UART1] =   {0x24, 17},
76         [MA35D1_RESET_UART2] =   {0x24, 18},
77         [MA35D1_RESET_UART3] =   {0x24, 19},
78         [MA35D1_RESET_UART4] =   {0x24, 20},
79         [MA35D1_RESET_UART5] =   {0x24, 21},
80         [MA35D1_RESET_UART6] =   {0x24, 22},
81         [MA35D1_RESET_UART7] =   {0x24, 23},
82         [MA35D1_RESET_CANFD0] =  {0x24, 24},
83         [MA35D1_RESET_CANFD1] =  {0x24, 25},
84         [MA35D1_RESET_EADC0] =   {0x24, 28},
85         [MA35D1_RESET_I2S0] =    {0x24, 29},
86         [MA35D1_RESET_SC0] =     {0x28, 0},
87         [MA35D1_RESET_SC1] =     {0x28, 1},
88         [MA35D1_RESET_QSPI1] =   {0x28, 4},
89         [MA35D1_RESET_SPI3] =    {0x28, 6},
90         [MA35D1_RESET_EPWM0] =   {0x28, 16},
91         [MA35D1_RESET_EPWM1] =   {0x28, 17},
92         [MA35D1_RESET_QEI0] =    {0x28, 22},
93         [MA35D1_RESET_QEI1] =    {0x28, 23},
94         [MA35D1_RESET_ECAP0] =   {0x28, 26},
95         [MA35D1_RESET_ECAP1] =   {0x28, 27},
96         [MA35D1_RESET_CANFD2] =  {0x28, 28},
97         [MA35D1_RESET_ADC0] =    {0x28, 31},
98         [MA35D1_RESET_TMR4] =    {0x2C, 0},
99         [MA35D1_RESET_TMR5] =    {0x2C, 1},
100         [MA35D1_RESET_TMR6] =    {0x2C, 2},
101         [MA35D1_RESET_TMR7] =    {0x2C, 3},
102         [MA35D1_RESET_TMR8] =    {0x2C, 4},
103         [MA35D1_RESET_TMR9] =    {0x2C, 5},
104         [MA35D1_RESET_TMR10] =   {0x2C, 6},
105         [MA35D1_RESET_TMR11] =   {0x2C, 7},
106         [MA35D1_RESET_UART8] =   {0x2C, 8},
107         [MA35D1_RESET_UART9] =   {0x2C, 9},
108         [MA35D1_RESET_UART10] =  {0x2C, 10},
109         [MA35D1_RESET_UART11] =  {0x2C, 11},
110         [MA35D1_RESET_UART12] =  {0x2C, 12},
111         [MA35D1_RESET_UART13] =  {0x2C, 13},
112         [MA35D1_RESET_UART14] =  {0x2C, 14},
113         [MA35D1_RESET_UART15] =  {0x2C, 15},
114         [MA35D1_RESET_UART16] =  {0x2C, 16},
115         [MA35D1_RESET_I2S1] =    {0x2C, 17},
116         [MA35D1_RESET_I2C4] =    {0x2C, 18},
117         [MA35D1_RESET_I2C5] =    {0x2C, 19},
118         [MA35D1_RESET_EPWM2] =   {0x2C, 20},
119         [MA35D1_RESET_ECAP2] =   {0x2C, 21},
120         [MA35D1_RESET_QEI2] =    {0x2C, 22},
121         [MA35D1_RESET_CANFD3] =  {0x2C, 23},
122         [MA35D1_RESET_KPI] =     {0x2C, 24},
123         [MA35D1_RESET_GIC] =     {0x2C, 28},
124         [MA35D1_RESET_SSMCC] =   {0x2C, 30},
125         [MA35D1_RESET_SSPCC] =   {0x2C, 31}
126 };
127
128 static int ma35d1_restart_handler(struct notifier_block *this, unsigned long mode, void *cmd)
129 {
130         struct ma35d1_reset_data *data =
131                                  container_of(this, struct ma35d1_reset_data, restart_handler);
132         u32 id = MA35D1_RESET_CHIP;
133
134         writel_relaxed(BIT(ma35d1_reset_map[id].bit),
135                        data->base + ma35d1_reset_map[id].reg_ofs);
136         return 0;
137 }
138
139 static int ma35d1_reset_update(struct reset_controller_dev *rcdev, unsigned long id, bool assert)
140 {
141         struct ma35d1_reset_data *data = container_of(rcdev, struct ma35d1_reset_data, rcdev);
142         unsigned long flags;
143         u32 reg;
144
145         if (WARN_ON_ONCE(id >= ARRAY_SIZE(ma35d1_reset_map)))
146                 return -EINVAL;
147
148         spin_lock_irqsave(&data->lock, flags);
149         reg = readl_relaxed(data->base + ma35d1_reset_map[id].reg_ofs);
150         if (assert)
151                 reg |= BIT(ma35d1_reset_map[id].bit);
152         else
153                 reg &= ~(BIT(ma35d1_reset_map[id].bit));
154         writel_relaxed(reg, data->base + ma35d1_reset_map[id].reg_ofs);
155         spin_unlock_irqrestore(&data->lock, flags);
156
157         return 0;
158 }
159
160 static int ma35d1_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
161 {
162         return ma35d1_reset_update(rcdev, id, true);
163 }
164
165 static int ma35d1_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
166 {
167         return ma35d1_reset_update(rcdev, id, false);
168 }
169
170 static int ma35d1_reset_status(struct reset_controller_dev *rcdev, unsigned long id)
171 {
172         struct ma35d1_reset_data *data = container_of(rcdev, struct ma35d1_reset_data, rcdev);
173         u32 reg;
174
175         if (WARN_ON_ONCE(id >= ARRAY_SIZE(ma35d1_reset_map)))
176                 return -EINVAL;
177
178         reg = readl_relaxed(data->base + ma35d1_reset_map[id].reg_ofs);
179         return !!(reg & BIT(ma35d1_reset_map[id].bit));
180 }
181
182 static const struct reset_control_ops ma35d1_reset_ops = {
183         .assert = ma35d1_reset_assert,
184         .deassert = ma35d1_reset_deassert,
185         .status = ma35d1_reset_status,
186 };
187
188 static const struct of_device_id ma35d1_reset_dt_ids[] = {
189         { .compatible = "nuvoton,ma35d1-reset" },
190         { },
191 };
192
193 static int ma35d1_reset_probe(struct platform_device *pdev)
194 {
195         struct ma35d1_reset_data *reset_data;
196         struct device *dev = &pdev->dev;
197         int err;
198
199         if (!pdev->dev.of_node) {
200                 dev_err(&pdev->dev, "Device tree node not found\n");
201                 return -EINVAL;
202         }
203
204         reset_data = devm_kzalloc(dev, sizeof(*reset_data), GFP_KERNEL);
205         if (!reset_data)
206                 return -ENOMEM;
207
208         reset_data->base = devm_platform_ioremap_resource(pdev, 0);
209         if (IS_ERR(reset_data->base))
210                 return PTR_ERR(reset_data->base);
211
212         reset_data->rcdev.owner = THIS_MODULE;
213         reset_data->rcdev.nr_resets = MA35D1_RESET_COUNT;
214         reset_data->rcdev.ops = &ma35d1_reset_ops;
215         reset_data->rcdev.of_node = dev->of_node;
216         reset_data->restart_handler.notifier_call = ma35d1_restart_handler;
217         reset_data->restart_handler.priority = 192;
218         spin_lock_init(&reset_data->lock);
219
220         err = register_restart_handler(&reset_data->restart_handler);
221         if (err)
222                 dev_warn(&pdev->dev, "failed to register restart handler\n");
223
224         return devm_reset_controller_register(dev, &reset_data->rcdev);
225 }
226
227 static struct platform_driver ma35d1_reset_driver = {
228         .probe = ma35d1_reset_probe,
229         .driver = {
230                 .name = "ma35d1-reset",
231                 .of_match_table = ma35d1_reset_dt_ids,
232         },
233 };
234
235 builtin_platform_driver(ma35d1_reset_driver);