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5f0a96b0 AS |
1 | /* |
2 | * AMD CS5535/CS5536 GPIO driver | |
3 | * Copyright (C) 2006 Advanced Micro Devices, Inc. | |
4 | * Copyright (C) 2007-2009 Andres Salomon <dilinger@collabora.co.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public License | |
8 | * as published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/pci.h> | |
15 | #include <linux/gpio.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/cs5535.h> | |
18 | ||
19 | #define DRV_NAME "cs5535-gpio" | |
20 | #define GPIO_BAR 1 | |
21 | ||
1ea3fa7b TM |
22 | /* |
23 | * Some GPIO pins | |
24 | * 31-29,23 : reserved (always mask out) | |
25 | * 28 : Power Button | |
26 | * 26 : PME# | |
27 | * 22-16 : LPC | |
28 | * 14,15 : SMBus | |
29 | * 9,8 : UART1 | |
30 | * 7 : PCI INTB | |
31 | * 3,4 : UART2/DDC | |
32 | * 2 : IDE_IRQ0 | |
33 | * 1 : AC_BEEP | |
34 | * 0 : PCI INTA | |
35 | * | |
36 | * If a mask was not specified, allow all except | |
37 | * reserved and Power Button | |
38 | */ | |
39 | #define GPIO_DEFAULT_MASK 0x0F7FFFFF | |
40 | ||
41 | static ulong mask = GPIO_DEFAULT_MASK; | |
42 | module_param_named(mask, mask, ulong, 0444); | |
43 | MODULE_PARM_DESC(mask, "GPIO channel mask."); | |
44 | ||
5f0a96b0 AS |
45 | static struct cs5535_gpio_chip { |
46 | struct gpio_chip chip; | |
47 | resource_size_t base; | |
48 | ||
49 | struct pci_dev *pdev; | |
50 | spinlock_t lock; | |
51 | } cs5535_gpio_chip; | |
52 | ||
53 | /* | |
54 | * The CS5535/CS5536 GPIOs support a number of extra features not defined | |
55 | * by the gpio_chip API, so these are exported. For a full list of the | |
56 | * registers, see include/linux/cs5535.h. | |
57 | */ | |
58 | ||
59 | static void __cs5535_gpio_set(struct cs5535_gpio_chip *chip, unsigned offset, | |
60 | unsigned int reg) | |
61 | { | |
62 | if (offset < 16) | |
63 | /* low bank register */ | |
64 | outl(1 << offset, chip->base + reg); | |
65 | else | |
66 | /* high bank register */ | |
67 | outl(1 << (offset - 16), chip->base + 0x80 + reg); | |
68 | } | |
69 | ||
70 | void cs5535_gpio_set(unsigned offset, unsigned int reg) | |
71 | { | |
72 | struct cs5535_gpio_chip *chip = &cs5535_gpio_chip; | |
73 | unsigned long flags; | |
74 | ||
75 | spin_lock_irqsave(&chip->lock, flags); | |
76 | __cs5535_gpio_set(chip, offset, reg); | |
77 | spin_unlock_irqrestore(&chip->lock, flags); | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(cs5535_gpio_set); | |
80 | ||
81 | static void __cs5535_gpio_clear(struct cs5535_gpio_chip *chip, unsigned offset, | |
82 | unsigned int reg) | |
83 | { | |
84 | if (offset < 16) | |
85 | /* low bank register */ | |
86 | outl(1 << (offset + 16), chip->base + reg); | |
87 | else | |
88 | /* high bank register */ | |
89 | outl(1 << offset, chip->base + 0x80 + reg); | |
90 | } | |
91 | ||
92 | void cs5535_gpio_clear(unsigned offset, unsigned int reg) | |
93 | { | |
94 | struct cs5535_gpio_chip *chip = &cs5535_gpio_chip; | |
95 | unsigned long flags; | |
96 | ||
97 | spin_lock_irqsave(&chip->lock, flags); | |
98 | __cs5535_gpio_clear(chip, offset, reg); | |
99 | spin_unlock_irqrestore(&chip->lock, flags); | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(cs5535_gpio_clear); | |
102 | ||
103 | int cs5535_gpio_isset(unsigned offset, unsigned int reg) | |
104 | { | |
105 | struct cs5535_gpio_chip *chip = &cs5535_gpio_chip; | |
106 | unsigned long flags; | |
107 | long val; | |
108 | ||
109 | spin_lock_irqsave(&chip->lock, flags); | |
110 | if (offset < 16) | |
111 | /* low bank register */ | |
112 | val = inl(chip->base + reg); | |
113 | else { | |
114 | /* high bank register */ | |
115 | val = inl(chip->base + 0x80 + reg); | |
116 | offset -= 16; | |
117 | } | |
118 | spin_unlock_irqrestore(&chip->lock, flags); | |
119 | ||
120 | return (val & (1 << offset)) ? 1 : 0; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(cs5535_gpio_isset); | |
123 | ||
124 | /* | |
125 | * Generic gpio_chip API support. | |
126 | */ | |
127 | ||
1ea3fa7b TM |
128 | static int chip_gpio_request(struct gpio_chip *c, unsigned offset) |
129 | { | |
130 | struct cs5535_gpio_chip *chip = (struct cs5535_gpio_chip *) c; | |
131 | unsigned long flags; | |
132 | ||
133 | spin_lock_irqsave(&chip->lock, flags); | |
134 | ||
135 | /* check if this pin is available */ | |
136 | if ((mask & (1 << offset)) == 0) { | |
137 | dev_info(&chip->pdev->dev, | |
138 | "pin %u is not available (check mask)\n", offset); | |
139 | spin_unlock_irqrestore(&chip->lock, flags); | |
140 | return -EINVAL; | |
141 | } | |
142 | ||
143 | /* disable output aux 1 & 2 on this pin */ | |
144 | __cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_AUX1); | |
145 | __cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_AUX2); | |
146 | ||
147 | /* disable input aux 1 on this pin */ | |
148 | __cs5535_gpio_clear(chip, offset, GPIO_INPUT_AUX1); | |
149 | ||
150 | spin_unlock_irqrestore(&chip->lock, flags); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
5f0a96b0 AS |
155 | static int chip_gpio_get(struct gpio_chip *chip, unsigned offset) |
156 | { | |
a8a5164c | 157 | return cs5535_gpio_isset(offset, GPIO_READ_BACK); |
5f0a96b0 AS |
158 | } |
159 | ||
160 | static void chip_gpio_set(struct gpio_chip *chip, unsigned offset, int val) | |
161 | { | |
162 | if (val) | |
163 | cs5535_gpio_set(offset, GPIO_OUTPUT_VAL); | |
164 | else | |
165 | cs5535_gpio_clear(offset, GPIO_OUTPUT_VAL); | |
166 | } | |
167 | ||
168 | static int chip_direction_input(struct gpio_chip *c, unsigned offset) | |
169 | { | |
170 | struct cs5535_gpio_chip *chip = (struct cs5535_gpio_chip *) c; | |
171 | unsigned long flags; | |
172 | ||
173 | spin_lock_irqsave(&chip->lock, flags); | |
174 | __cs5535_gpio_set(chip, offset, GPIO_INPUT_ENABLE); | |
a8a5164c | 175 | __cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_ENABLE); |
5f0a96b0 AS |
176 | spin_unlock_irqrestore(&chip->lock, flags); |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static int chip_direction_output(struct gpio_chip *c, unsigned offset, int val) | |
182 | { | |
183 | struct cs5535_gpio_chip *chip = (struct cs5535_gpio_chip *) c; | |
184 | unsigned long flags; | |
185 | ||
186 | spin_lock_irqsave(&chip->lock, flags); | |
187 | ||
a8a5164c | 188 | __cs5535_gpio_set(chip, offset, GPIO_INPUT_ENABLE); |
5f0a96b0 AS |
189 | __cs5535_gpio_set(chip, offset, GPIO_OUTPUT_ENABLE); |
190 | if (val) | |
191 | __cs5535_gpio_set(chip, offset, GPIO_OUTPUT_VAL); | |
192 | else | |
193 | __cs5535_gpio_clear(chip, offset, GPIO_OUTPUT_VAL); | |
194 | ||
195 | spin_unlock_irqrestore(&chip->lock, flags); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
62154991 | 200 | static const char * const cs5535_gpio_names[] = { |
1ea3fa7b TM |
201 | "GPIO0", "GPIO1", "GPIO2", "GPIO3", |
202 | "GPIO4", "GPIO5", "GPIO6", "GPIO7", | |
203 | "GPIO8", "GPIO9", "GPIO10", "GPIO11", | |
204 | "GPIO12", "GPIO13", "GPIO14", "GPIO15", | |
205 | "GPIO16", "GPIO17", "GPIO18", "GPIO19", | |
206 | "GPIO20", "GPIO21", "GPIO22", NULL, | |
207 | "GPIO24", "GPIO25", "GPIO26", "GPIO27", | |
208 | "GPIO28", NULL, NULL, NULL, | |
209 | }; | |
210 | ||
5f0a96b0 AS |
211 | static struct cs5535_gpio_chip cs5535_gpio_chip = { |
212 | .chip = { | |
213 | .owner = THIS_MODULE, | |
214 | .label = DRV_NAME, | |
215 | ||
216 | .base = 0, | |
1ea3fa7b TM |
217 | .ngpio = 32, |
218 | .names = cs5535_gpio_names, | |
219 | .request = chip_gpio_request, | |
5f0a96b0 AS |
220 | |
221 | .get = chip_gpio_get, | |
222 | .set = chip_gpio_set, | |
223 | ||
224 | .direction_input = chip_direction_input, | |
225 | .direction_output = chip_direction_output, | |
226 | }, | |
227 | }; | |
228 | ||
229 | static int __init cs5535_gpio_probe(struct pci_dev *pdev, | |
230 | const struct pci_device_id *pci_id) | |
231 | { | |
232 | int err; | |
1ea3fa7b | 233 | ulong mask_orig = mask; |
5f0a96b0 AS |
234 | |
235 | /* There are two ways to get the GPIO base address; one is by | |
236 | * fetching it from MSR_LBAR_GPIO, the other is by reading the | |
237 | * PCI BAR info. The latter method is easier (especially across | |
238 | * different architectures), so we'll stick with that for now. If | |
239 | * it turns out to be unreliable in the face of crappy BIOSes, we | |
240 | * can always go back to using MSRs.. */ | |
241 | ||
242 | err = pci_enable_device_io(pdev); | |
243 | if (err) { | |
244 | dev_err(&pdev->dev, "can't enable device IO\n"); | |
245 | goto done; | |
246 | } | |
247 | ||
248 | err = pci_request_region(pdev, GPIO_BAR, DRV_NAME); | |
249 | if (err) { | |
250 | dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", GPIO_BAR); | |
251 | goto done; | |
252 | } | |
253 | ||
254 | /* set up the driver-specific struct */ | |
255 | cs5535_gpio_chip.base = pci_resource_start(pdev, GPIO_BAR); | |
256 | cs5535_gpio_chip.pdev = pdev; | |
257 | spin_lock_init(&cs5535_gpio_chip.lock); | |
258 | ||
259 | dev_info(&pdev->dev, "allocated PCI BAR #%d: base 0x%llx\n", GPIO_BAR, | |
260 | (unsigned long long) cs5535_gpio_chip.base); | |
261 | ||
1ea3fa7b TM |
262 | /* mask out reserved pins */ |
263 | mask &= 0x1F7FFFFF; | |
264 | ||
265 | /* do not allow pin 28, Power Button, as there's special handling | |
266 | * in the PMC needed. (note 12, p. 48) */ | |
267 | mask &= ~(1 << 28); | |
268 | ||
269 | if (mask_orig != mask) | |
270 | dev_info(&pdev->dev, "mask changed from 0x%08lX to 0x%08lX\n", | |
271 | mask_orig, mask); | |
272 | ||
5f0a96b0 AS |
273 | /* finally, register with the generic GPIO API */ |
274 | err = gpiochip_add(&cs5535_gpio_chip.chip); | |
1ea3fa7b | 275 | if (err) |
5f0a96b0 | 276 | goto release_region; |
5f0a96b0 | 277 | |
1ea3fa7b | 278 | dev_info(&pdev->dev, DRV_NAME ": GPIO support successfully loaded.\n"); |
5f0a96b0 AS |
279 | return 0; |
280 | ||
281 | release_region: | |
282 | pci_release_region(pdev, GPIO_BAR); | |
283 | done: | |
284 | return err; | |
285 | } | |
286 | ||
287 | static void __exit cs5535_gpio_remove(struct pci_dev *pdev) | |
288 | { | |
289 | int err; | |
290 | ||
291 | err = gpiochip_remove(&cs5535_gpio_chip.chip); | |
292 | if (err) { | |
293 | /* uhh? */ | |
294 | dev_err(&pdev->dev, "unable to remove gpio_chip?\n"); | |
295 | } | |
296 | pci_release_region(pdev, GPIO_BAR); | |
297 | } | |
298 | ||
299 | static struct pci_device_id cs5535_gpio_pci_tbl[] = { | |
300 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) }, | |
301 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) }, | |
302 | { 0, }, | |
303 | }; | |
304 | MODULE_DEVICE_TABLE(pci, cs5535_gpio_pci_tbl); | |
305 | ||
306 | /* | |
307 | * We can't use the standard PCI driver registration stuff here, since | |
308 | * that allows only one driver to bind to each PCI device (and we want | |
309 | * multiple drivers to be able to bind to the device). Instead, manually | |
310 | * scan for the PCI device, request a single region, and keep track of the | |
311 | * devices that we're using. | |
312 | */ | |
313 | ||
314 | static int __init cs5535_gpio_scan_pci(void) | |
315 | { | |
316 | struct pci_dev *pdev; | |
317 | int err = -ENODEV; | |
318 | int i; | |
319 | ||
320 | for (i = 0; i < ARRAY_SIZE(cs5535_gpio_pci_tbl); i++) { | |
321 | pdev = pci_get_device(cs5535_gpio_pci_tbl[i].vendor, | |
322 | cs5535_gpio_pci_tbl[i].device, NULL); | |
323 | if (pdev) { | |
324 | err = cs5535_gpio_probe(pdev, &cs5535_gpio_pci_tbl[i]); | |
325 | if (err) | |
326 | pci_dev_put(pdev); | |
327 | ||
328 | /* we only support a single CS5535/6 southbridge */ | |
329 | break; | |
330 | } | |
331 | } | |
332 | ||
333 | return err; | |
334 | } | |
335 | ||
336 | static void __exit cs5535_gpio_free_pci(void) | |
337 | { | |
338 | cs5535_gpio_remove(cs5535_gpio_chip.pdev); | |
339 | pci_dev_put(cs5535_gpio_chip.pdev); | |
340 | } | |
341 | ||
342 | static int __init cs5535_gpio_init(void) | |
343 | { | |
344 | return cs5535_gpio_scan_pci(); | |
345 | } | |
346 | ||
347 | static void __exit cs5535_gpio_exit(void) | |
348 | { | |
349 | cs5535_gpio_free_pci(); | |
350 | } | |
351 | ||
352 | module_init(cs5535_gpio_init); | |
353 | module_exit(cs5535_gpio_exit); | |
354 | ||
d45840d9 | 355 | MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>"); |
5f0a96b0 AS |
356 | MODULE_DESCRIPTION("AMD CS5535/CS5536 GPIO driver"); |
357 | MODULE_LICENSE("GPL"); |