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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Support code for the SCOOP interface found on various Sharp PDAs
4 *
5 * Copyright (c) 2004 Richard Purdie
6 *
7 * Based on code written by Sharp/Lineo for 2.4 kernels
8 */
9
10#include <linux/device.h>
11#include <linux/gpio/driver.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <linux/platform_device.h>
15#include <linux/export.h>
16#include <linux/io.h>
17#include <asm/hardware/scoop.h>
18
19/* PCMCIA to Scoop linkage
20
21 There is no easy way to link multiple scoop devices into one
22 single entity for the pxa2xx_pcmcia device so this structure
23 is used which is setup by the platform code.
24
25 This file is never modular so this symbol is always
26 accessile to the board support files.
27*/
28struct scoop_pcmcia_config *platform_scoop_config;
29EXPORT_SYMBOL(platform_scoop_config);
30
31struct scoop_dev {
32 void __iomem *base;
33 struct gpio_chip gpio;
34 spinlock_t scoop_lock;
35 unsigned short suspend_clr;
36 unsigned short suspend_set;
37 u32 scoop_gpwr;
38};
39
40void reset_scoop(struct device *dev)
41{
42 struct scoop_dev *sdev = dev_get_drvdata(dev);
43
44 iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */
45 iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */
46 iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */
47 iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */
48 iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */
49 iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */
50 iowrite16(0x0000, sdev->base + SCOOP_IRM);
51}
52
53static void __scoop_gpio_set(struct scoop_dev *sdev,
54 unsigned offset, int value)
55{
56 unsigned short gpwr;
57
58 gpwr = ioread16(sdev->base + SCOOP_GPWR);
59 if (value)
60 gpwr |= 1 << (offset + 1);
61 else
62 gpwr &= ~(1 << (offset + 1));
63 iowrite16(gpwr, sdev->base + SCOOP_GPWR);
64}
65
66static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
67{
68 struct scoop_dev *sdev = gpiochip_get_data(chip);
69 unsigned long flags;
70
71 spin_lock_irqsave(&sdev->scoop_lock, flags);
72
73 __scoop_gpio_set(sdev, offset, value);
74
75 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
76}
77
78static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
79{
80 struct scoop_dev *sdev = gpiochip_get_data(chip);
81
82 /* XXX: I'm unsure, but it seems so */
83 return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1)));
84}
85
86static int scoop_gpio_direction_input(struct gpio_chip *chip,
87 unsigned offset)
88{
89 struct scoop_dev *sdev = gpiochip_get_data(chip);
90 unsigned long flags;
91 unsigned short gpcr;
92
93 spin_lock_irqsave(&sdev->scoop_lock, flags);
94
95 gpcr = ioread16(sdev->base + SCOOP_GPCR);
96 gpcr &= ~(1 << (offset + 1));
97 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
98
99 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
100
101 return 0;
102}
103
104static int scoop_gpio_direction_output(struct gpio_chip *chip,
105 unsigned offset, int value)
106{
107 struct scoop_dev *sdev = gpiochip_get_data(chip);
108 unsigned long flags;
109 unsigned short gpcr;
110
111 spin_lock_irqsave(&sdev->scoop_lock, flags);
112
113 __scoop_gpio_set(sdev, offset, value);
114
115 gpcr = ioread16(sdev->base + SCOOP_GPCR);
116 gpcr |= 1 << (offset + 1);
117 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
118
119 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
120
121 return 0;
122}
123
124unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
125{
126 struct scoop_dev *sdev = dev_get_drvdata(dev);
127 return ioread16(sdev->base + reg);
128}
129
130void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
131{
132 struct scoop_dev *sdev = dev_get_drvdata(dev);
133 iowrite16(data, sdev->base + reg);
134}
135
136EXPORT_SYMBOL(reset_scoop);
137EXPORT_SYMBOL(read_scoop_reg);
138EXPORT_SYMBOL(write_scoop_reg);
139
140#ifdef CONFIG_PM
141static void check_scoop_reg(struct scoop_dev *sdev)
142{
143 unsigned short mcr;
144
145 mcr = ioread16(sdev->base + SCOOP_MCR);
146 if ((mcr & 0x100) == 0)
147 iowrite16(0x0101, sdev->base + SCOOP_MCR);
148}
149
150static int scoop_suspend(struct platform_device *dev, pm_message_t state)
151{
152 struct scoop_dev *sdev = platform_get_drvdata(dev);
153
154 check_scoop_reg(sdev);
155 sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
156 iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
157
158 return 0;
159}
160
161static int scoop_resume(struct platform_device *dev)
162{
163 struct scoop_dev *sdev = platform_get_drvdata(dev);
164
165 check_scoop_reg(sdev);
166 iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
167
168 return 0;
169}
170#else
171#define scoop_suspend NULL
172#define scoop_resume NULL
173#endif
174
175static int scoop_probe(struct platform_device *pdev)
176{
177 struct scoop_dev *devptr;
178 struct scoop_config *inf;
179 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
180 int ret;
181
182 if (!mem)
183 return -EINVAL;
184
185 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
186 if (!devptr)
187 return -ENOMEM;
188
189 spin_lock_init(&devptr->scoop_lock);
190
191 inf = pdev->dev.platform_data;
192 devptr->base = ioremap(mem->start, resource_size(mem));
193
194 if (!devptr->base) {
195 ret = -ENOMEM;
196 goto err_ioremap;
197 }
198
199 platform_set_drvdata(pdev, devptr);
200
201 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
202
203 iowrite16(0x0140, devptr->base + SCOOP_MCR);
204 reset_scoop(&pdev->dev);
205 iowrite16(0x0000, devptr->base + SCOOP_CPR);
206 iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
207 iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
208
209 devptr->suspend_clr = inf->suspend_clr;
210 devptr->suspend_set = inf->suspend_set;
211
212 devptr->gpio.base = -1;
213
214 if (inf->gpio_base != 0) {
215 devptr->gpio.label = dev_name(&pdev->dev);
216 devptr->gpio.base = inf->gpio_base;
217 devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
218 devptr->gpio.set = scoop_gpio_set;
219 devptr->gpio.get = scoop_gpio_get;
220 devptr->gpio.direction_input = scoop_gpio_direction_input;
221 devptr->gpio.direction_output = scoop_gpio_direction_output;
222
223 ret = gpiochip_add_data(&devptr->gpio, devptr);
224 if (ret)
225 goto err_gpio;
226 }
227
228 return 0;
229
230err_gpio:
231 platform_set_drvdata(pdev, NULL);
232err_ioremap:
233 iounmap(devptr->base);
234 kfree(devptr);
235
236 return ret;
237}
238
239static void scoop_remove(struct platform_device *pdev)
240{
241 struct scoop_dev *sdev = platform_get_drvdata(pdev);
242
243 if (sdev->gpio.base != -1)
244 gpiochip_remove(&sdev->gpio);
245
246 platform_set_drvdata(pdev, NULL);
247 iounmap(sdev->base);
248 kfree(sdev);
249}
250
251static struct platform_driver scoop_driver = {
252 .probe = scoop_probe,
253 .remove_new = scoop_remove,
254 .suspend = scoop_suspend,
255 .resume = scoop_resume,
256 .driver = {
257 .name = "sharp-scoop",
258 },
259};
260
261static int __init scoop_init(void)
262{
263 return platform_driver_register(&scoop_driver);
264}
265
266subsys_initcall(scoop_init);
1/*
2 * Support code for the SCOOP interface found on various Sharp PDAs
3 *
4 * Copyright (c) 2004 Richard Purdie
5 *
6 * Based on code written by Sharp/Lineo for 2.4 kernels
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
14#include <linux/device.h>
15#include <linux/gpio.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18#include <linux/platform_device.h>
19#include <linux/export.h>
20#include <linux/io.h>
21#include <asm/hardware/scoop.h>
22
23/* PCMCIA to Scoop linkage
24
25 There is no easy way to link multiple scoop devices into one
26 single entity for the pxa2xx_pcmcia device so this structure
27 is used which is setup by the platform code.
28
29 This file is never modular so this symbol is always
30 accessile to the board support files.
31*/
32struct scoop_pcmcia_config *platform_scoop_config;
33EXPORT_SYMBOL(platform_scoop_config);
34
35struct scoop_dev {
36 void __iomem *base;
37 struct gpio_chip gpio;
38 spinlock_t scoop_lock;
39 unsigned short suspend_clr;
40 unsigned short suspend_set;
41 u32 scoop_gpwr;
42};
43
44void reset_scoop(struct device *dev)
45{
46 struct scoop_dev *sdev = dev_get_drvdata(dev);
47
48 iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */
49 iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */
50 iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */
51 iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */
52 iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */
53 iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */
54 iowrite16(0x0000, sdev->base + SCOOP_IRM);
55}
56
57static void __scoop_gpio_set(struct scoop_dev *sdev,
58 unsigned offset, int value)
59{
60 unsigned short gpwr;
61
62 gpwr = ioread16(sdev->base + SCOOP_GPWR);
63 if (value)
64 gpwr |= 1 << (offset + 1);
65 else
66 gpwr &= ~(1 << (offset + 1));
67 iowrite16(gpwr, sdev->base + SCOOP_GPWR);
68}
69
70static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
71{
72 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
73 unsigned long flags;
74
75 spin_lock_irqsave(&sdev->scoop_lock, flags);
76
77 __scoop_gpio_set(sdev, offset, value);
78
79 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
80}
81
82static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset)
83{
84 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
85
86 /* XXX: I'm unsure, but it seems so */
87 return ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1));
88}
89
90static int scoop_gpio_direction_input(struct gpio_chip *chip,
91 unsigned offset)
92{
93 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
94 unsigned long flags;
95 unsigned short gpcr;
96
97 spin_lock_irqsave(&sdev->scoop_lock, flags);
98
99 gpcr = ioread16(sdev->base + SCOOP_GPCR);
100 gpcr &= ~(1 << (offset + 1));
101 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
102
103 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
104
105 return 0;
106}
107
108static int scoop_gpio_direction_output(struct gpio_chip *chip,
109 unsigned offset, int value)
110{
111 struct scoop_dev *sdev = container_of(chip, struct scoop_dev, gpio);
112 unsigned long flags;
113 unsigned short gpcr;
114
115 spin_lock_irqsave(&sdev->scoop_lock, flags);
116
117 __scoop_gpio_set(sdev, offset, value);
118
119 gpcr = ioread16(sdev->base + SCOOP_GPCR);
120 gpcr |= 1 << (offset + 1);
121 iowrite16(gpcr, sdev->base + SCOOP_GPCR);
122
123 spin_unlock_irqrestore(&sdev->scoop_lock, flags);
124
125 return 0;
126}
127
128unsigned short read_scoop_reg(struct device *dev, unsigned short reg)
129{
130 struct scoop_dev *sdev = dev_get_drvdata(dev);
131 return ioread16(sdev->base + reg);
132}
133
134void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data)
135{
136 struct scoop_dev *sdev = dev_get_drvdata(dev);
137 iowrite16(data, sdev->base + reg);
138}
139
140EXPORT_SYMBOL(reset_scoop);
141EXPORT_SYMBOL(read_scoop_reg);
142EXPORT_SYMBOL(write_scoop_reg);
143
144#ifdef CONFIG_PM
145static void check_scoop_reg(struct scoop_dev *sdev)
146{
147 unsigned short mcr;
148
149 mcr = ioread16(sdev->base + SCOOP_MCR);
150 if ((mcr & 0x100) == 0)
151 iowrite16(0x0101, sdev->base + SCOOP_MCR);
152}
153
154static int scoop_suspend(struct platform_device *dev, pm_message_t state)
155{
156 struct scoop_dev *sdev = platform_get_drvdata(dev);
157
158 check_scoop_reg(sdev);
159 sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR);
160 iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR);
161
162 return 0;
163}
164
165static int scoop_resume(struct platform_device *dev)
166{
167 struct scoop_dev *sdev = platform_get_drvdata(dev);
168
169 check_scoop_reg(sdev);
170 iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR);
171
172 return 0;
173}
174#else
175#define scoop_suspend NULL
176#define scoop_resume NULL
177#endif
178
179static int scoop_probe(struct platform_device *pdev)
180{
181 struct scoop_dev *devptr;
182 struct scoop_config *inf;
183 struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
184 int ret;
185 int temp;
186
187 if (!mem)
188 return -EINVAL;
189
190 devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL);
191 if (!devptr)
192 return -ENOMEM;
193
194 spin_lock_init(&devptr->scoop_lock);
195
196 inf = pdev->dev.platform_data;
197 devptr->base = ioremap(mem->start, resource_size(mem));
198
199 if (!devptr->base) {
200 ret = -ENOMEM;
201 goto err_ioremap;
202 }
203
204 platform_set_drvdata(pdev, devptr);
205
206 printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base);
207
208 iowrite16(0x0140, devptr->base + SCOOP_MCR);
209 reset_scoop(&pdev->dev);
210 iowrite16(0x0000, devptr->base + SCOOP_CPR);
211 iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR);
212 iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR);
213
214 devptr->suspend_clr = inf->suspend_clr;
215 devptr->suspend_set = inf->suspend_set;
216
217 devptr->gpio.base = -1;
218
219 if (inf->gpio_base != 0) {
220 devptr->gpio.label = dev_name(&pdev->dev);
221 devptr->gpio.base = inf->gpio_base;
222 devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */
223 devptr->gpio.set = scoop_gpio_set;
224 devptr->gpio.get = scoop_gpio_get;
225 devptr->gpio.direction_input = scoop_gpio_direction_input;
226 devptr->gpio.direction_output = scoop_gpio_direction_output;
227
228 ret = gpiochip_add(&devptr->gpio);
229 if (ret)
230 goto err_gpio;
231 }
232
233 return 0;
234
235err_gpio:
236 platform_set_drvdata(pdev, NULL);
237err_ioremap:
238 iounmap(devptr->base);
239 kfree(devptr);
240
241 return ret;
242}
243
244static int scoop_remove(struct platform_device *pdev)
245{
246 struct scoop_dev *sdev = platform_get_drvdata(pdev);
247 int ret;
248
249 if (!sdev)
250 return -EINVAL;
251
252 if (sdev->gpio.base != -1) {
253 ret = gpiochip_remove(&sdev->gpio);
254 if (ret) {
255 dev_err(&pdev->dev, "Can't remove gpio chip: %d\n", ret);
256 return ret;
257 }
258 }
259
260 platform_set_drvdata(pdev, NULL);
261 iounmap(sdev->base);
262 kfree(sdev);
263
264 return 0;
265}
266
267static struct platform_driver scoop_driver = {
268 .probe = scoop_probe,
269 .remove = scoop_remove,
270 .suspend = scoop_suspend,
271 .resume = scoop_resume,
272 .driver = {
273 .name = "sharp-scoop",
274 },
275};
276
277static int __init scoop_init(void)
278{
279 return platform_driver_register(&scoop_driver);
280}
281
282subsys_initcall(scoop_init);