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12262bef BR |
1 | /* |
2 | * GPIO driver for the SMSC SCH311x Super-I/O chips | |
3 | * | |
4 | * Copyright (C) 2013 Bruno Randolf <br1@einfach.org> | |
5 | * | |
6 | * SuperIO functions and chip detection: | |
7 | * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/gpio.h> | |
20 | #include <linux/bitops.h> | |
523639e6 | 21 | #include <linux/io.h> |
12262bef BR |
22 | |
23 | #define DRV_NAME "gpio-sch311x" | |
24 | ||
25 | #define SCH311X_GPIO_CONF_OUT 0x00 | |
26 | #define SCH311X_GPIO_CONF_IN 0x01 | |
27 | #define SCH311X_GPIO_CONF_INVERT 0x02 | |
28 | #define SCH311X_GPIO_CONF_OPEN_DRAIN 0x80 | |
29 | ||
30 | #define SIO_CONFIG_KEY_ENTER 0x55 | |
31 | #define SIO_CONFIG_KEY_EXIT 0xaa | |
32 | ||
33 | #define GP1 0x4b | |
34 | ||
35 | static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e }; | |
36 | ||
37 | static struct platform_device *sch311x_gpio_pdev; | |
38 | ||
39 | struct sch311x_pdev_data { /* platform device data */ | |
40 | unsigned short runtime_reg; /* runtime register base address */ | |
41 | }; | |
42 | ||
43 | struct sch311x_gpio_block { /* one GPIO block runtime data */ | |
44 | struct gpio_chip chip; | |
45 | unsigned short data_reg; /* from definition below */ | |
46 | unsigned short *config_regs; /* pointer to definition below */ | |
47 | unsigned short runtime_reg; /* runtime register */ | |
48 | spinlock_t lock; /* lock for this GPIO block */ | |
49 | }; | |
50 | ||
51 | struct sch311x_gpio_priv { /* driver private data */ | |
52 | struct sch311x_gpio_block blocks[6]; | |
53 | }; | |
54 | ||
55 | struct sch311x_gpio_block_def { /* register address definitions */ | |
56 | unsigned short data_reg; | |
57 | unsigned short config_regs[8]; | |
58 | unsigned short base; | |
59 | }; | |
60 | ||
61 | /* Note: some GPIOs are not available, these are marked with 0x00 */ | |
62 | ||
63 | static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = { | |
64 | { | |
65 | .data_reg = 0x4b, /* GP1 */ | |
66 | .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b}, | |
67 | .base = 10, | |
68 | }, | |
69 | { | |
70 | .data_reg = 0x4c, /* GP2 */ | |
71 | .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32}, | |
72 | .base = 20, | |
73 | }, | |
74 | { | |
75 | .data_reg = 0x4d, /* GP3 */ | |
76 | .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a}, | |
77 | .base = 30, | |
78 | }, | |
79 | { | |
80 | .data_reg = 0x4e, /* GP4 */ | |
81 | .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73}, | |
82 | .base = 40, | |
83 | }, | |
84 | { | |
85 | .data_reg = 0x4f, /* GP5 */ | |
86 | .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46}, | |
87 | .base = 50, | |
88 | }, | |
89 | { | |
90 | .data_reg = 0x50, /* GP6 */ | |
91 | .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59}, | |
92 | .base = 60, | |
93 | }, | |
94 | }; | |
95 | ||
96 | static inline struct sch311x_gpio_block * | |
97 | to_sch311x_gpio_block(struct gpio_chip *chip) | |
98 | { | |
99 | return container_of(chip, struct sch311x_gpio_block, chip); | |
100 | } | |
101 | ||
102 | ||
103 | /* | |
104 | * Super-IO functions | |
105 | */ | |
106 | ||
107 | static inline int sch311x_sio_enter(int sio_config_port) | |
108 | { | |
109 | /* Don't step on other drivers' I/O space by accident. */ | |
110 | if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) { | |
111 | pr_err(DRV_NAME "I/O address 0x%04x already in use\n", | |
112 | sio_config_port); | |
113 | return -EBUSY; | |
114 | } | |
115 | ||
116 | outb(SIO_CONFIG_KEY_ENTER, sio_config_port); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static inline void sch311x_sio_exit(int sio_config_port) | |
121 | { | |
122 | outb(SIO_CONFIG_KEY_EXIT, sio_config_port); | |
123 | release_region(sio_config_port, 2); | |
124 | } | |
125 | ||
126 | static inline int sch311x_sio_inb(int sio_config_port, int reg) | |
127 | { | |
128 | outb(reg, sio_config_port); | |
129 | return inb(sio_config_port + 1); | |
130 | } | |
131 | ||
132 | static inline void sch311x_sio_outb(int sio_config_port, int reg, int val) | |
133 | { | |
134 | outb(reg, sio_config_port); | |
135 | outb(val, sio_config_port + 1); | |
136 | } | |
137 | ||
138 | ||
139 | /* | |
140 | * GPIO functions | |
141 | */ | |
142 | ||
143 | static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset) | |
144 | { | |
145 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
146 | ||
147 | if (block->config_regs[offset] == 0) /* GPIO is not available */ | |
148 | return -ENODEV; | |
149 | ||
150 | if (!request_region(block->runtime_reg + block->config_regs[offset], | |
151 | 1, DRV_NAME)) { | |
152 | dev_err(chip->dev, "Failed to request region 0x%04x.\n", | |
153 | block->runtime_reg + block->config_regs[offset]); | |
154 | return -EBUSY; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset) | |
160 | { | |
161 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
162 | ||
163 | if (block->config_regs[offset] == 0) /* GPIO is not available */ | |
164 | return; | |
165 | ||
166 | release_region(block->runtime_reg + block->config_regs[offset], 1); | |
167 | } | |
168 | ||
169 | static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset) | |
170 | { | |
171 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
172 | unsigned char data; | |
173 | ||
174 | spin_lock(&block->lock); | |
175 | data = inb(block->runtime_reg + block->data_reg); | |
176 | spin_unlock(&block->lock); | |
177 | ||
178 | return !!(data & BIT(offset)); | |
179 | } | |
180 | ||
181 | static void __sch311x_gpio_set(struct sch311x_gpio_block *block, | |
182 | unsigned offset, int value) | |
183 | { | |
184 | unsigned char data = inb(block->runtime_reg + block->data_reg); | |
185 | if (value) | |
186 | data |= BIT(offset); | |
187 | else | |
188 | data &= ~BIT(offset); | |
189 | outb(data, block->runtime_reg + block->data_reg); | |
190 | } | |
191 | ||
192 | static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset, | |
193 | int value) | |
194 | { | |
195 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
196 | ||
197 | spin_lock(&block->lock); | |
198 | __sch311x_gpio_set(block, offset, value); | |
199 | spin_unlock(&block->lock); | |
200 | } | |
201 | ||
202 | static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
203 | { | |
204 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
205 | ||
206 | spin_lock(&block->lock); | |
207 | outb(SCH311X_GPIO_CONF_IN, block->runtime_reg + | |
208 | block->config_regs[offset]); | |
209 | spin_unlock(&block->lock); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset, | |
215 | int value) | |
216 | { | |
217 | struct sch311x_gpio_block *block = to_sch311x_gpio_block(chip); | |
218 | ||
219 | spin_lock(&block->lock); | |
220 | ||
221 | outb(SCH311X_GPIO_CONF_OUT, block->runtime_reg + | |
222 | block->config_regs[offset]); | |
223 | ||
224 | __sch311x_gpio_set(block, offset, value); | |
225 | ||
226 | spin_unlock(&block->lock); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int sch311x_gpio_probe(struct platform_device *pdev) | |
231 | { | |
232 | struct sch311x_pdev_data *pdata = pdev->dev.platform_data; | |
233 | struct sch311x_gpio_priv *priv; | |
234 | struct sch311x_gpio_block *block; | |
235 | int err, i; | |
236 | ||
237 | /* we can register all GPIO data registers at once */ | |
238 | if (!request_region(pdata->runtime_reg + GP1, 6, DRV_NAME)) { | |
239 | dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n", | |
240 | pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5); | |
241 | return -EBUSY; | |
242 | } | |
243 | ||
244 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | |
245 | if (!priv) | |
246 | return -ENOMEM; | |
247 | ||
248 | platform_set_drvdata(pdev, priv); | |
249 | ||
250 | for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) { | |
251 | block = &priv->blocks[i]; | |
252 | ||
253 | spin_lock_init(&block->lock); | |
254 | ||
255 | block->chip.label = DRV_NAME; | |
256 | block->chip.owner = THIS_MODULE; | |
257 | block->chip.request = sch311x_gpio_request; | |
258 | block->chip.free = sch311x_gpio_free; | |
259 | block->chip.direction_input = sch311x_gpio_direction_in; | |
260 | block->chip.direction_output = sch311x_gpio_direction_out; | |
261 | block->chip.get = sch311x_gpio_get; | |
262 | block->chip.set = sch311x_gpio_set; | |
263 | block->chip.ngpio = 8; | |
264 | block->chip.dev = &pdev->dev; | |
265 | block->chip.base = sch311x_gpio_blocks[i].base; | |
266 | block->config_regs = sch311x_gpio_blocks[i].config_regs; | |
267 | block->data_reg = sch311x_gpio_blocks[i].data_reg; | |
268 | block->runtime_reg = pdata->runtime_reg; | |
269 | ||
270 | err = gpiochip_add(&block->chip); | |
271 | if (err < 0) { | |
272 | dev_err(&pdev->dev, | |
273 | "Could not register gpiochip, %d\n", err); | |
274 | goto exit_err; | |
275 | } | |
276 | dev_info(&pdev->dev, | |
277 | "SMSC SCH311x GPIO block %d registered.\n", i); | |
278 | } | |
279 | ||
280 | return 0; | |
281 | ||
282 | exit_err: | |
283 | release_region(pdata->runtime_reg + GP1, 6); | |
284 | /* release already registered chips */ | |
285 | for (--i; i >= 0; i--) | |
286 | gpiochip_remove(&priv->blocks[i].chip); | |
287 | return err; | |
288 | } | |
289 | ||
290 | static int sch311x_gpio_remove(struct platform_device *pdev) | |
291 | { | |
292 | struct sch311x_pdev_data *pdata = pdev->dev.platform_data; | |
293 | struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev); | |
9f5132ae | 294 | int i; |
12262bef BR |
295 | |
296 | release_region(pdata->runtime_reg + GP1, 6); | |
297 | ||
298 | for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) { | |
9f5132ae | 299 | gpiochip_remove(&priv->blocks[i].chip); |
12262bef BR |
300 | dev_info(&pdev->dev, |
301 | "SMSC SCH311x GPIO block %d unregistered.\n", i); | |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static struct platform_driver sch311x_gpio_driver = { | |
307 | .driver.name = DRV_NAME, | |
308 | .driver.owner = THIS_MODULE, | |
309 | .probe = sch311x_gpio_probe, | |
310 | .remove = sch311x_gpio_remove, | |
311 | }; | |
312 | ||
313 | ||
314 | /* | |
315 | * Init & exit routines | |
316 | */ | |
317 | ||
318 | static int __init sch311x_detect(int sio_config_port, unsigned short *addr) | |
319 | { | |
320 | int err = 0, reg; | |
321 | unsigned short base_addr; | |
322 | unsigned char dev_id; | |
323 | ||
324 | err = sch311x_sio_enter(sio_config_port); | |
325 | if (err) | |
326 | return err; | |
327 | ||
7e9fcc9d | 328 | /* Check device ID. */ |
12262bef | 329 | reg = sch311x_sio_inb(sio_config_port, 0x20); |
7e9fcc9d AL |
330 | switch (reg) { |
331 | case 0x7c: /* SCH3112 */ | |
332 | dev_id = 2; | |
333 | break; | |
334 | case 0x7d: /* SCH3114 */ | |
335 | dev_id = 4; | |
336 | break; | |
337 | case 0x7f: /* SCH3116 */ | |
338 | dev_id = 6; | |
339 | break; | |
340 | default: | |
12262bef BR |
341 | err = -ENODEV; |
342 | goto exit; | |
343 | } | |
12262bef BR |
344 | |
345 | /* Select logical device A (runtime registers) */ | |
346 | sch311x_sio_outb(sio_config_port, 0x07, 0x0a); | |
347 | ||
348 | /* Check if Logical Device Register is currently active */ | |
349 | if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0) | |
350 | pr_info("Seems that LDN 0x0a is not active...\n"); | |
351 | ||
352 | /* Get the base address of the runtime registers */ | |
353 | base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) | | |
354 | sch311x_sio_inb(sio_config_port, 0x61); | |
355 | if (!base_addr) { | |
356 | pr_err("Base address not set\n"); | |
357 | err = -ENODEV; | |
358 | goto exit; | |
359 | } | |
360 | *addr = base_addr; | |
361 | ||
362 | pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr); | |
363 | ||
364 | exit: | |
365 | sch311x_sio_exit(sio_config_port); | |
366 | return err; | |
367 | } | |
368 | ||
369 | static int __init sch311x_gpio_pdev_add(const unsigned short addr) | |
370 | { | |
371 | struct sch311x_pdev_data pdata; | |
372 | int err; | |
373 | ||
374 | pdata.runtime_reg = addr; | |
375 | ||
376 | sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1); | |
377 | if (!sch311x_gpio_pdev) | |
378 | return -ENOMEM; | |
379 | ||
380 | err = platform_device_add_data(sch311x_gpio_pdev, | |
381 | &pdata, sizeof(pdata)); | |
382 | if (err) { | |
383 | pr_err(DRV_NAME "Platform data allocation failed\n"); | |
384 | goto err; | |
385 | } | |
386 | ||
387 | err = platform_device_add(sch311x_gpio_pdev); | |
388 | if (err) { | |
389 | pr_err(DRV_NAME "Device addition failed\n"); | |
390 | goto err; | |
391 | } | |
392 | return 0; | |
393 | ||
394 | err: | |
395 | platform_device_put(sch311x_gpio_pdev); | |
396 | return err; | |
397 | } | |
398 | ||
399 | static int __init sch311x_gpio_init(void) | |
400 | { | |
401 | int err, i; | |
402 | unsigned short addr = 0; | |
403 | ||
404 | for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++) | |
405 | if (sch311x_detect(sch311x_ioports[i], &addr) == 0) | |
406 | break; | |
407 | ||
408 | if (!addr) | |
409 | return -ENODEV; | |
410 | ||
411 | err = platform_driver_register(&sch311x_gpio_driver); | |
412 | if (err) | |
413 | return err; | |
414 | ||
415 | err = sch311x_gpio_pdev_add(addr); | |
416 | if (err) | |
417 | goto unreg_platform_driver; | |
418 | ||
419 | return 0; | |
420 | ||
421 | unreg_platform_driver: | |
422 | platform_driver_unregister(&sch311x_gpio_driver); | |
423 | return err; | |
424 | } | |
425 | ||
426 | static void __exit sch311x_gpio_exit(void) | |
427 | { | |
428 | platform_device_unregister(sch311x_gpio_pdev); | |
429 | platform_driver_unregister(&sch311x_gpio_driver); | |
430 | } | |
431 | ||
432 | module_init(sch311x_gpio_init); | |
433 | module_exit(sch311x_gpio_exit); | |
434 | ||
435 | MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>"); | |
436 | MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver"); | |
437 | MODULE_LICENSE("GPL"); | |
438 | MODULE_ALIAS("platform:gpio-sch311x"); |