]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
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 | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/device.h> | |
2f8163ba | 11 | #include <linux/gpio.h> |
4e57b681 | 12 | #include <linux/string.h> |
de25968c | 13 | #include <linux/slab.h> |
d052d1be | 14 | #include <linux/platform_device.h> |
dc28094b | 15 | #include <linux/export.h> |
fced80c7 | 16 | #include <linux/io.h> |
1da177e4 LT |
17 | #include <asm/hardware/scoop.h> |
18 | ||
7ea3bbbc RP |
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 | */ | |
28 | struct scoop_pcmcia_config *platform_scoop_config; | |
29 | EXPORT_SYMBOL(platform_scoop_config); | |
30 | ||
1da177e4 | 31 | struct scoop_dev { |
2f8c5149 | 32 | void __iomem *base; |
b43a9e60 | 33 | struct gpio_chip gpio; |
1da177e4 | 34 | spinlock_t scoop_lock; |
7c398988 RP |
35 | unsigned short suspend_clr; |
36 | unsigned short suspend_set; | |
1da177e4 LT |
37 | u32 scoop_gpwr; |
38 | }; | |
39 | ||
40 | void reset_scoop(struct device *dev) | |
41 | { | |
42 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
43 | ||
aa88bc0a HS |
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 */ | |
c353faa4 | 50 | iowrite16(0x0000, sdev->base + SCOOP_IRM); |
1da177e4 LT |
51 | } |
52 | ||
b43a9e60 DB |
53 | static 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 | ||
66 | static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
67 | { | |
050c5429 | 68 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
b43a9e60 DB |
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 | ||
78 | static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset) | |
79 | { | |
050c5429 | 80 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
b43a9e60 | 81 | |
af901ca1 | 82 | /* XXX: I'm unsure, but it seems so */ |
86d5e657 | 83 | return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1))); |
b43a9e60 DB |
84 | } |
85 | ||
86 | static int scoop_gpio_direction_input(struct gpio_chip *chip, | |
87 | unsigned offset) | |
88 | { | |
050c5429 | 89 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
b43a9e60 DB |
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 | ||
104 | static int scoop_gpio_direction_output(struct gpio_chip *chip, | |
105 | unsigned offset, int value) | |
106 | { | |
050c5429 | 107 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
b43a9e60 DB |
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 | ||
1da177e4 LT |
124 | unsigned short read_scoop_reg(struct device *dev, unsigned short reg) |
125 | { | |
126 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
c353faa4 | 127 | return ioread16(sdev->base + reg); |
1da177e4 LT |
128 | } |
129 | ||
130 | void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) | |
131 | { | |
132 | struct scoop_dev *sdev = dev_get_drvdata(dev); | |
c353faa4 | 133 | iowrite16(data, sdev->base + reg); |
1da177e4 LT |
134 | } |
135 | ||
136 | EXPORT_SYMBOL(reset_scoop); | |
137 | EXPORT_SYMBOL(read_scoop_reg); | |
138 | EXPORT_SYMBOL(write_scoop_reg); | |
139 | ||
cfab57e0 | 140 | #ifdef CONFIG_PM |
7c398988 RP |
141 | static void check_scoop_reg(struct scoop_dev *sdev) |
142 | { | |
143 | unsigned short mcr; | |
144 | ||
c353faa4 | 145 | mcr = ioread16(sdev->base + SCOOP_MCR); |
7c398988 | 146 | if ((mcr & 0x100) == 0) |
c353faa4 | 147 | iowrite16(0x0101, sdev->base + SCOOP_MCR); |
7c398988 RP |
148 | } |
149 | ||
3ae5eaec | 150 | static int scoop_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 151 | { |
3ae5eaec | 152 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
9480e307 RK |
153 | |
154 | check_scoop_reg(sdev); | |
c353faa4 DB |
155 | sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR); |
156 | iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR); | |
1da177e4 | 157 | |
1da177e4 LT |
158 | return 0; |
159 | } | |
160 | ||
3ae5eaec | 161 | static int scoop_resume(struct platform_device *dev) |
1da177e4 | 162 | { |
3ae5eaec | 163 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
9480e307 RK |
164 | |
165 | check_scoop_reg(sdev); | |
c353faa4 | 166 | iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR); |
1da177e4 | 167 | |
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | #else | |
171 | #define scoop_suspend NULL | |
172 | #define scoop_resume NULL | |
173 | #endif | |
174 | ||
351a102d | 175 | static int scoop_probe(struct platform_device *pdev) |
1da177e4 LT |
176 | { |
177 | struct scoop_dev *devptr; | |
178 | struct scoop_config *inf; | |
1da177e4 | 179 | struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
b43a9e60 | 180 | int ret; |
1da177e4 LT |
181 | |
182 | if (!mem) | |
183 | return -EINVAL; | |
184 | ||
d2a02b93 | 185 | devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); |
1da177e4 | 186 | if (!devptr) |
d2a02b93 | 187 | return -ENOMEM; |
1da177e4 | 188 | |
1da177e4 LT |
189 | spin_lock_init(&devptr->scoop_lock); |
190 | ||
3ae5eaec | 191 | inf = pdev->dev.platform_data; |
28f65c11 | 192 | devptr->base = ioremap(mem->start, resource_size(mem)); |
1da177e4 LT |
193 | |
194 | if (!devptr->base) { | |
b43a9e60 DB |
195 | ret = -ENOMEM; |
196 | goto err_ioremap; | |
1da177e4 LT |
197 | } |
198 | ||
3ae5eaec | 199 | platform_set_drvdata(pdev, devptr); |
1da177e4 | 200 | |
2f8c5149 | 201 | printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base); |
1da177e4 | 202 | |
c353faa4 | 203 | iowrite16(0x0140, devptr->base + SCOOP_MCR); |
c35bf4a5 | 204 | reset_scoop(&pdev->dev); |
c353faa4 DB |
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); | |
1da177e4 | 208 | |
7c398988 RP |
209 | devptr->suspend_clr = inf->suspend_clr; |
210 | devptr->suspend_set = inf->suspend_set; | |
211 | ||
b43a9e60 DB |
212 | devptr->gpio.base = -1; |
213 | ||
214 | if (inf->gpio_base != 0) { | |
3f978704 | 215 | devptr->gpio.label = dev_name(&pdev->dev); |
b43a9e60 DB |
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 | ||
050c5429 | 223 | ret = gpiochip_add_data(&devptr->gpio, devptr); |
b43a9e60 DB |
224 | if (ret) |
225 | goto err_gpio; | |
226 | } | |
227 | ||
1da177e4 | 228 | return 0; |
b43a9e60 | 229 | |
b43a9e60 DB |
230 | err_gpio: |
231 | platform_set_drvdata(pdev, NULL); | |
232 | err_ioremap: | |
233 | iounmap(devptr->base); | |
234 | kfree(devptr); | |
235 | ||
236 | return ret; | |
1da177e4 LT |
237 | } |
238 | ||
351a102d | 239 | static int scoop_remove(struct platform_device *pdev) |
1da177e4 | 240 | { |
3ae5eaec | 241 | struct scoop_dev *sdev = platform_get_drvdata(pdev); |
b43a9e60 DB |
242 | |
243 | if (!sdev) | |
244 | return -EINVAL; | |
245 | ||
88d5e520 | 246 | if (sdev->gpio.base != -1) |
247 | gpiochip_remove(&sdev->gpio); | |
b43a9e60 DB |
248 | |
249 | platform_set_drvdata(pdev, NULL); | |
250 | iounmap(sdev->base); | |
251 | kfree(sdev); | |
252 | ||
1da177e4 LT |
253 | return 0; |
254 | } | |
255 | ||
3ae5eaec | 256 | static struct platform_driver scoop_driver = { |
1da177e4 | 257 | .probe = scoop_probe, |
351a102d | 258 | .remove = scoop_remove, |
1da177e4 LT |
259 | .suspend = scoop_suspend, |
260 | .resume = scoop_resume, | |
3ae5eaec RK |
261 | .driver = { |
262 | .name = "sharp-scoop", | |
263 | }, | |
1da177e4 LT |
264 | }; |
265 | ||
2f8c5149 | 266 | static int __init scoop_init(void) |
1da177e4 | 267 | { |
3ae5eaec | 268 | return platform_driver_register(&scoop_driver); |
1da177e4 LT |
269 | } |
270 | ||
271 | subsys_initcall(scoop_init); |