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[mirror_ubuntu-focal-kernel.git] / drivers / mfd / htc-pasic3.c
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b886d83c 1// SPDX-License-Identifier: GPL-2.0-only
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2/*
3 * Core driver for HTC PASIC3 LED/DS1WM chip.
4 *
5 * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com>
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6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11
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12#include <linux/gpio.h>
13#include <linux/io.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
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16#include <linux/mfd/core.h>
17#include <linux/mfd/ds1wm.h>
5dc3339a 18#include <linux/mfd/htc-pasic3.h>
5a0e3ad6 19#include <linux/slab.h>
5dc3339a 20
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21struct pasic3_data {
22 void __iomem *mapping;
23 unsigned int bus_shift;
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24};
25
26#define REG_ADDR 5
27#define REG_DATA 6
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28
29#define READ_MODE 0x80
30
31/*
32 * write to a secondary register on the PASIC3
33 */
34void pasic3_write_register(struct device *dev, u32 reg, u8 val)
35{
1902a9e6 36 struct pasic3_data *asic = dev_get_drvdata(dev);
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37 int bus_shift = asic->bus_shift;
38 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
39 void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
40
41 __raw_writeb(~READ_MODE & reg, addr);
42 __raw_writeb(val, data);
43}
44EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */
45
46/*
47 * read from a secondary register on the PASIC3
48 */
49u8 pasic3_read_register(struct device *dev, u32 reg)
50{
1902a9e6 51 struct pasic3_data *asic = dev_get_drvdata(dev);
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52 int bus_shift = asic->bus_shift;
53 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift);
54 void __iomem *data = asic->mapping + (REG_DATA << bus_shift);
55
56 __raw_writeb(READ_MODE | reg, addr);
57 return __raw_readb(data);
58}
59EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */
60
61/*
62 * LEDs
63 */
64
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65static struct mfd_cell led_cell __initdata = {
66 .name = "leds-pasic3",
67};
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68
69/*
70 * DS1WM
71 */
72
0254a8f4 73static int ds1wm_enable(struct platform_device *pdev)
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74{
75 struct device *dev = pdev->dev.parent;
76 int c;
77
78 c = pasic3_read_register(dev, 0x28);
79 pasic3_write_register(dev, 0x28, c & 0x7f);
80
81 dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f);
0254a8f4 82 return 0;
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83}
84
0254a8f4 85static int ds1wm_disable(struct platform_device *pdev)
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86{
87 struct device *dev = pdev->dev.parent;
88 int c;
89
90 c = pasic3_read_register(dev, 0x28);
91 pasic3_write_register(dev, 0x28, c | 0x80);
92
93 dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80);
0254a8f4 94 return 0;
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95}
96
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97static struct ds1wm_driver_data ds1wm_pdata = {
98 .active_high = 0,
f607e7fc 99 .reset_recover_delay = 1,
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100};
101
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102static struct resource ds1wm_resources[] __initdata = {
103 [0] = {
104 .start = 0,
105 .flags = IORESOURCE_MEM,
106 },
107 [1] = {
108 .start = 0,
109 .end = 0,
110 .flags = IORESOURCE_IRQ,
111 },
112};
5dc3339a 113
5ac98553 114static const struct mfd_cell ds1wm_cell __initconst = {
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115 .name = "ds1wm",
116 .enable = ds1wm_enable,
117 .disable = ds1wm_disable,
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118 .platform_data = &ds1wm_pdata,
119 .pdata_size = sizeof(ds1wm_pdata),
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120 .num_resources = 2,
121 .resources = ds1wm_resources,
122};
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123
124static int __init pasic3_probe(struct platform_device *pdev)
125{
334a41ce 126 struct pasic3_platform_data *pdata = dev_get_platdata(&pdev->dev);
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127 struct device *dev = &pdev->dev;
128 struct pasic3_data *asic;
129 struct resource *r;
130 int ret;
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131 int irq = 0;
132
133 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
134 if (r) {
135 ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags &
136 (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE));
137 irq = r->start;
138 }
139
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140 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
141 if (!r)
142 return -ENXIO;
143
0254a8f4 144 if (!request_mem_region(r->start, resource_size(r), "pasic3"))
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145 return -EBUSY;
146
8692881e 147 asic = devm_kzalloc(dev, sizeof(struct pasic3_data), GFP_KERNEL);
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148 if (!asic)
149 return -ENOMEM;
150
151 platform_set_drvdata(pdev, asic);
152
0254a8f4 153 asic->mapping = ioremap(r->start, resource_size(r));
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154 if (!asic->mapping) {
155 dev_err(dev, "couldn't ioremap PASIC3\n");
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156 return -ENOMEM;
157 }
158
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159 /* calculate bus shift from mem resource */
160 asic->bus_shift = (resource_size(r) - 5) >> 3;
161
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162 if (pdata && pdata->clock_rate) {
163 ds1wm_pdata.clock_rate = pdata->clock_rate;
164 /* the first 5 PASIC3 registers control the DS1WM */
165 ds1wm_resources[0].end = (5 << asic->bus_shift) - 1;
47c10edd 166 ret = mfd_add_devices(&pdev->dev, pdev->id,
0848c94f 167 &ds1wm_cell, 1, r, irq, NULL);
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168 if (ret < 0)
169 dev_warn(dev, "failed to register DS1WM\n");
170 }
171
172 if (pdata && pdata->led_pdata) {
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173 led_cell.platform_data = pdata->led_pdata;
174 led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo);
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175 ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r,
176 0, NULL);
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177 if (ret < 0)
178 dev_warn(dev, "failed to register LED device\n");
179 }
180
181 return 0;
182}
183
184static int pasic3_remove(struct platform_device *pdev)
185{
186 struct pasic3_data *asic = platform_get_drvdata(pdev);
187 struct resource *r;
188
0254a8f4 189 mfd_remove_devices(&pdev->dev);
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190
191 iounmap(asic->mapping);
192 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
0254a8f4 193 release_mem_region(r->start, resource_size(r));
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194 return 0;
195}
196
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197MODULE_ALIAS("platform:pasic3");
198
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199static struct platform_driver pasic3_driver = {
200 .driver = {
201 .name = "pasic3",
202 },
203 .remove = pasic3_remove,
204};
205
e8fe6a82 206module_platform_driver_probe(pasic3_driver, pasic3_probe);
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207
208MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>");
209MODULE_DESCRIPTION("Core driver for HTC PASIC3");
210MODULE_LICENSE("GPL");