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a0d65009 MS |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * GPIO interface for Winbond Super I/O chips | |
4 | * Currently, only W83627UHG (Nuvoton NCT6627UD) is supported. | |
5 | * | |
6 | * Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name> | |
7 | */ | |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/gpio/driver.h> | |
12 | #include <linux/ioport.h> | |
13 | #include <linux/isa.h> | |
14 | #include <linux/module.h> | |
15 | ||
16 | #define WB_GPIO_DRIVER_NAME KBUILD_MODNAME | |
17 | ||
18 | #define WB_SIO_BASE 0x2e | |
19 | #define WB_SIO_BASE_HIGH 0x4e | |
20 | ||
21 | #define WB_SIO_EXT_ENTER_KEY 0x87 | |
22 | #define WB_SIO_EXT_EXIT_KEY 0xaa | |
23 | ||
24 | /* global chip registers */ | |
25 | ||
26 | #define WB_SIO_REG_LOGICAL 0x07 | |
27 | ||
28 | #define WB_SIO_REG_CHIP_MSB 0x20 | |
29 | #define WB_SIO_REG_CHIP_LSB 0x21 | |
30 | ||
31 | #define WB_SIO_CHIP_ID_W83627UHG 0xa230 | |
32 | #define WB_SIO_CHIP_ID_W83627UHG_MASK GENMASK(15, 4) | |
33 | ||
34 | #define WB_SIO_REG_DPD 0x22 | |
35 | #define WB_SIO_REG_DPD_UARTA 4 | |
36 | #define WB_SIO_REG_DPD_UARTB 5 | |
37 | ||
38 | #define WB_SIO_REG_IDPD 0x23 | |
39 | #define WB_SIO_REG_IDPD_UARTC 4 | |
40 | #define WB_SIO_REG_IDPD_UARTD 5 | |
41 | #define WB_SIO_REG_IDPD_UARTE 6 | |
42 | #define WB_SIO_REG_IDPD_UARTF 7 | |
43 | ||
44 | #define WB_SIO_REG_GLOBAL_OPT 0x24 | |
45 | #define WB_SIO_REG_GO_ENFDC 1 | |
46 | ||
47 | #define WB_SIO_REG_OVTGPIO3456 0x29 | |
48 | #define WB_SIO_REG_OG3456_G3PP 3 | |
49 | #define WB_SIO_REG_OG3456_G4PP 4 | |
50 | #define WB_SIO_REG_OG3456_G5PP 5 | |
51 | #define WB_SIO_REG_OG3456_G6PP 7 | |
52 | ||
53 | #define WB_SIO_REG_I2C_PS 0x2a | |
54 | #define WB_SIO_REG_I2CPS_I2CFS 1 | |
55 | ||
56 | #define WB_SIO_REG_GPIO1_MF 0x2c | |
57 | #define WB_SIO_REG_G1MF_G1PP 6 | |
58 | #define WB_SIO_REG_G1MF_G2PP 7 | |
59 | #define WB_SIO_REG_G1MF_FS_MASK GENMASK(1, 0) | |
60 | #define WB_SIO_REG_G1MF_FS_IR_OFF 0 | |
61 | #define WB_SIO_REG_G1MF_FS_IR 1 | |
62 | #define WB_SIO_REG_G1MF_FS_GPIO1 2 | |
63 | #define WB_SIO_REG_G1MF_FS_UARTB 3 | |
64 | ||
65 | /* not an actual device number, just a value meaning 'no device' */ | |
66 | #define WB_SIO_DEV_NONE 0xff | |
67 | ||
68 | /* registers with offsets >= 0x30 are specific for a particular device */ | |
69 | ||
70 | /* UART B logical device */ | |
71 | #define WB_SIO_DEV_UARTB 0x03 | |
72 | #define WB_SIO_UARTB_REG_ENABLE 0x30 | |
73 | #define WB_SIO_UARTB_ENABLE_ON 0 | |
74 | ||
75 | /* UART C logical device */ | |
76 | #define WB_SIO_DEV_UARTC 0x06 | |
77 | #define WB_SIO_UARTC_REG_ENABLE 0x30 | |
78 | #define WB_SIO_UARTC_ENABLE_ON 0 | |
79 | ||
80 | /* GPIO3, GPIO4 logical device */ | |
81 | #define WB_SIO_DEV_GPIO34 0x07 | |
82 | #define WB_SIO_GPIO34_REG_ENABLE 0x30 | |
83 | #define WB_SIO_GPIO34_ENABLE_3 0 | |
84 | #define WB_SIO_GPIO34_ENABLE_4 1 | |
85 | #define WB_SIO_GPIO34_REG_IO3 0xe0 | |
86 | #define WB_SIO_GPIO34_REG_DATA3 0xe1 | |
87 | #define WB_SIO_GPIO34_REG_INV3 0xe2 | |
88 | #define WB_SIO_GPIO34_REG_IO4 0xe4 | |
89 | #define WB_SIO_GPIO34_REG_DATA4 0xe5 | |
90 | #define WB_SIO_GPIO34_REG_INV4 0xe6 | |
91 | ||
92 | /* WDTO, PLED, GPIO5, GPIO6 logical device */ | |
93 | #define WB_SIO_DEV_WDGPIO56 0x08 | |
94 | #define WB_SIO_WDGPIO56_REG_ENABLE 0x30 | |
95 | #define WB_SIO_WDGPIO56_ENABLE_5 1 | |
96 | #define WB_SIO_WDGPIO56_ENABLE_6 2 | |
97 | #define WB_SIO_WDGPIO56_REG_IO5 0xe0 | |
98 | #define WB_SIO_WDGPIO56_REG_DATA5 0xe1 | |
99 | #define WB_SIO_WDGPIO56_REG_INV5 0xe2 | |
100 | #define WB_SIO_WDGPIO56_REG_IO6 0xe4 | |
101 | #define WB_SIO_WDGPIO56_REG_DATA6 0xe5 | |
102 | #define WB_SIO_WDGPIO56_REG_INV6 0xe6 | |
103 | ||
104 | /* GPIO1, GPIO2, SUSLED logical device */ | |
105 | #define WB_SIO_DEV_GPIO12 0x09 | |
106 | #define WB_SIO_GPIO12_REG_ENABLE 0x30 | |
107 | #define WB_SIO_GPIO12_ENABLE_1 0 | |
108 | #define WB_SIO_GPIO12_ENABLE_2 1 | |
109 | #define WB_SIO_GPIO12_REG_IO1 0xe0 | |
110 | #define WB_SIO_GPIO12_REG_DATA1 0xe1 | |
111 | #define WB_SIO_GPIO12_REG_INV1 0xe2 | |
112 | #define WB_SIO_GPIO12_REG_IO2 0xe4 | |
113 | #define WB_SIO_GPIO12_REG_DATA2 0xe5 | |
114 | #define WB_SIO_GPIO12_REG_INV2 0xe6 | |
115 | ||
116 | /* UART D logical device */ | |
117 | #define WB_SIO_DEV_UARTD 0x0d | |
118 | #define WB_SIO_UARTD_REG_ENABLE 0x30 | |
119 | #define WB_SIO_UARTD_ENABLE_ON 0 | |
120 | ||
121 | /* UART E logical device */ | |
122 | #define WB_SIO_DEV_UARTE 0x0e | |
123 | #define WB_SIO_UARTE_REG_ENABLE 0x30 | |
124 | #define WB_SIO_UARTE_ENABLE_ON 0 | |
125 | ||
126 | /* | |
127 | * for a description what a particular field of this struct means please see | |
128 | * a description of the relevant module parameter at the bottom of this file | |
129 | */ | |
130 | struct winbond_gpio_params { | |
131 | unsigned long base; | |
132 | unsigned long gpios; | |
133 | unsigned long ppgpios; | |
134 | unsigned long odgpios; | |
135 | bool pledgpio; | |
136 | bool beepgpio; | |
137 | bool i2cgpio; | |
138 | }; | |
139 | ||
140 | static struct winbond_gpio_params params; | |
141 | ||
142 | static int winbond_sio_enter(unsigned long base) | |
143 | { | |
144 | if (!request_muxed_region(base, 2, WB_GPIO_DRIVER_NAME)) | |
145 | return -EBUSY; | |
146 | ||
147 | /* | |
148 | * datasheet says two successive writes of the "key" value are needed | |
149 | * in order for chip to enter the "Extended Function Mode" | |
150 | */ | |
151 | outb(WB_SIO_EXT_ENTER_KEY, base); | |
152 | outb(WB_SIO_EXT_ENTER_KEY, base); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static void winbond_sio_select_logical(unsigned long base, u8 dev) | |
158 | { | |
159 | outb(WB_SIO_REG_LOGICAL, base); | |
160 | outb(dev, base + 1); | |
161 | } | |
162 | ||
163 | static void winbond_sio_leave(unsigned long base) | |
164 | { | |
165 | outb(WB_SIO_EXT_EXIT_KEY, base); | |
166 | ||
167 | release_region(base, 2); | |
168 | } | |
169 | ||
170 | static void winbond_sio_reg_write(unsigned long base, u8 reg, u8 data) | |
171 | { | |
172 | outb(reg, base); | |
173 | outb(data, base + 1); | |
174 | } | |
175 | ||
176 | static u8 winbond_sio_reg_read(unsigned long base, u8 reg) | |
177 | { | |
178 | outb(reg, base); | |
179 | return inb(base + 1); | |
180 | } | |
181 | ||
182 | static void winbond_sio_reg_bset(unsigned long base, u8 reg, u8 bit) | |
183 | { | |
184 | u8 val; | |
185 | ||
186 | val = winbond_sio_reg_read(base, reg); | |
187 | val |= BIT(bit); | |
188 | winbond_sio_reg_write(base, reg, val); | |
189 | } | |
190 | ||
191 | static void winbond_sio_reg_bclear(unsigned long base, u8 reg, u8 bit) | |
192 | { | |
193 | u8 val; | |
194 | ||
195 | val = winbond_sio_reg_read(base, reg); | |
196 | val &= ~BIT(bit); | |
197 | winbond_sio_reg_write(base, reg, val); | |
198 | } | |
199 | ||
200 | static bool winbond_sio_reg_btest(unsigned long base, u8 reg, u8 bit) | |
201 | { | |
202 | return winbond_sio_reg_read(base, reg) & BIT(bit); | |
203 | } | |
204 | ||
205 | /** | |
206 | * struct winbond_gpio_port_conflict - possibly conflicting device information | |
207 | * @name: device name (NULL means no conflicting device defined) | |
208 | * @dev: Super I/O logical device number where the testreg register | |
209 | * is located (or WB_SIO_DEV_NONE - don't select any | |
210 | * logical device) | |
211 | * @testreg: register number where the testbit bit is located | |
212 | * @testbit: index of a bit to check whether an actual conflict exists | |
213 | * @warnonly: if set then a conflict isn't fatal (just warn about it), | |
214 | * otherwise disable the particular GPIO port if a conflict | |
215 | * is detected | |
216 | */ | |
217 | struct winbond_gpio_port_conflict { | |
218 | const char *name; | |
219 | u8 dev; | |
220 | u8 testreg; | |
221 | u8 testbit; | |
222 | bool warnonly; | |
223 | }; | |
224 | ||
225 | /** | |
226 | * struct winbond_gpio_info - information about a particular GPIO port (device) | |
227 | * @dev: Super I/O logical device number of the registers | |
228 | * specified below | |
229 | * @enablereg: port enable bit register number | |
230 | * @enablebit: index of a port enable bit | |
231 | * @outputreg: output driver mode bit register number | |
232 | * @outputppbit: index of a push-pull output driver mode bit | |
233 | * @ioreg: data direction register number | |
234 | * @invreg: pin data inversion register number | |
235 | * @datareg: pin data register number | |
236 | * @conflict: description of a device that possibly conflicts with | |
237 | * this port | |
238 | */ | |
239 | struct winbond_gpio_info { | |
240 | u8 dev; | |
241 | u8 enablereg; | |
242 | u8 enablebit; | |
243 | u8 outputreg; | |
244 | u8 outputppbit; | |
245 | u8 ioreg; | |
246 | u8 invreg; | |
247 | u8 datareg; | |
248 | struct winbond_gpio_port_conflict conflict; | |
249 | }; | |
250 | ||
251 | static const struct winbond_gpio_info winbond_gpio_infos[6] = { | |
252 | { /* 0 */ | |
253 | .dev = WB_SIO_DEV_GPIO12, | |
254 | .enablereg = WB_SIO_GPIO12_REG_ENABLE, | |
255 | .enablebit = WB_SIO_GPIO12_ENABLE_1, | |
256 | .outputreg = WB_SIO_REG_GPIO1_MF, | |
257 | .outputppbit = WB_SIO_REG_G1MF_G1PP, | |
258 | .ioreg = WB_SIO_GPIO12_REG_IO1, | |
259 | .invreg = WB_SIO_GPIO12_REG_INV1, | |
260 | .datareg = WB_SIO_GPIO12_REG_DATA1, | |
261 | .conflict = { | |
262 | .name = "UARTB", | |
263 | .dev = WB_SIO_DEV_UARTB, | |
264 | .testreg = WB_SIO_UARTB_REG_ENABLE, | |
265 | .testbit = WB_SIO_UARTB_ENABLE_ON, | |
266 | .warnonly = true | |
267 | } | |
268 | }, | |
269 | { /* 1 */ | |
270 | .dev = WB_SIO_DEV_GPIO12, | |
271 | .enablereg = WB_SIO_GPIO12_REG_ENABLE, | |
272 | .enablebit = WB_SIO_GPIO12_ENABLE_2, | |
273 | .outputreg = WB_SIO_REG_GPIO1_MF, | |
274 | .outputppbit = WB_SIO_REG_G1MF_G2PP, | |
275 | .ioreg = WB_SIO_GPIO12_REG_IO2, | |
276 | .invreg = WB_SIO_GPIO12_REG_INV2, | |
277 | .datareg = WB_SIO_GPIO12_REG_DATA2 | |
278 | /* special conflict handling so doesn't use conflict data */ | |
279 | }, | |
280 | { /* 2 */ | |
281 | .dev = WB_SIO_DEV_GPIO34, | |
282 | .enablereg = WB_SIO_GPIO34_REG_ENABLE, | |
283 | .enablebit = WB_SIO_GPIO34_ENABLE_3, | |
284 | .outputreg = WB_SIO_REG_OVTGPIO3456, | |
285 | .outputppbit = WB_SIO_REG_OG3456_G3PP, | |
286 | .ioreg = WB_SIO_GPIO34_REG_IO3, | |
287 | .invreg = WB_SIO_GPIO34_REG_INV3, | |
288 | .datareg = WB_SIO_GPIO34_REG_DATA3, | |
289 | .conflict = { | |
290 | .name = "UARTC", | |
291 | .dev = WB_SIO_DEV_UARTC, | |
292 | .testreg = WB_SIO_UARTC_REG_ENABLE, | |
293 | .testbit = WB_SIO_UARTC_ENABLE_ON, | |
294 | .warnonly = true | |
295 | } | |
296 | }, | |
297 | { /* 3 */ | |
298 | .dev = WB_SIO_DEV_GPIO34, | |
299 | .enablereg = WB_SIO_GPIO34_REG_ENABLE, | |
300 | .enablebit = WB_SIO_GPIO34_ENABLE_4, | |
301 | .outputreg = WB_SIO_REG_OVTGPIO3456, | |
302 | .outputppbit = WB_SIO_REG_OG3456_G4PP, | |
303 | .ioreg = WB_SIO_GPIO34_REG_IO4, | |
304 | .invreg = WB_SIO_GPIO34_REG_INV4, | |
305 | .datareg = WB_SIO_GPIO34_REG_DATA4, | |
306 | .conflict = { | |
307 | .name = "UARTD", | |
308 | .dev = WB_SIO_DEV_UARTD, | |
309 | .testreg = WB_SIO_UARTD_REG_ENABLE, | |
310 | .testbit = WB_SIO_UARTD_ENABLE_ON, | |
311 | .warnonly = true | |
312 | } | |
313 | }, | |
314 | { /* 4 */ | |
315 | .dev = WB_SIO_DEV_WDGPIO56, | |
316 | .enablereg = WB_SIO_WDGPIO56_REG_ENABLE, | |
317 | .enablebit = WB_SIO_WDGPIO56_ENABLE_5, | |
318 | .outputreg = WB_SIO_REG_OVTGPIO3456, | |
319 | .outputppbit = WB_SIO_REG_OG3456_G5PP, | |
320 | .ioreg = WB_SIO_WDGPIO56_REG_IO5, | |
321 | .invreg = WB_SIO_WDGPIO56_REG_INV5, | |
322 | .datareg = WB_SIO_WDGPIO56_REG_DATA5, | |
323 | .conflict = { | |
324 | .name = "UARTE", | |
325 | .dev = WB_SIO_DEV_UARTE, | |
326 | .testreg = WB_SIO_UARTE_REG_ENABLE, | |
327 | .testbit = WB_SIO_UARTE_ENABLE_ON, | |
328 | .warnonly = true | |
329 | } | |
330 | }, | |
331 | { /* 5 */ | |
332 | .dev = WB_SIO_DEV_WDGPIO56, | |
333 | .enablereg = WB_SIO_WDGPIO56_REG_ENABLE, | |
334 | .enablebit = WB_SIO_WDGPIO56_ENABLE_6, | |
335 | .outputreg = WB_SIO_REG_OVTGPIO3456, | |
336 | .outputppbit = WB_SIO_REG_OG3456_G6PP, | |
337 | .ioreg = WB_SIO_WDGPIO56_REG_IO6, | |
338 | .invreg = WB_SIO_WDGPIO56_REG_INV6, | |
339 | .datareg = WB_SIO_WDGPIO56_REG_DATA6, | |
340 | .conflict = { | |
341 | .name = "FDC", | |
342 | .dev = WB_SIO_DEV_NONE, | |
343 | .testreg = WB_SIO_REG_GLOBAL_OPT, | |
344 | .testbit = WB_SIO_REG_GO_ENFDC, | |
345 | .warnonly = false | |
346 | } | |
347 | } | |
348 | }; | |
349 | ||
350 | /* returns whether changing a pin is allowed */ | |
351 | static bool winbond_gpio_get_info(unsigned int *gpio_num, | |
352 | const struct winbond_gpio_info **info) | |
353 | { | |
354 | bool allow_changing = true; | |
355 | unsigned long i; | |
356 | ||
357 | for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG) { | |
358 | if (*gpio_num < 8) | |
359 | break; | |
360 | ||
361 | *gpio_num -= 8; | |
362 | } | |
363 | ||
364 | *info = &winbond_gpio_infos[i]; | |
365 | ||
366 | /* | |
367 | * GPIO2 (the second port) shares some pins with a basic PC | |
368 | * functionality, which is very likely controlled by the firmware. | |
369 | * Don't allow changing these pins by default. | |
370 | */ | |
371 | if (i == 1) { | |
372 | if (*gpio_num == 0 && !params.pledgpio) | |
373 | allow_changing = false; | |
374 | else if (*gpio_num == 1 && !params.beepgpio) | |
375 | allow_changing = false; | |
376 | else if ((*gpio_num == 5 || *gpio_num == 6) && !params.i2cgpio) | |
377 | allow_changing = false; | |
378 | } | |
379 | ||
380 | return allow_changing; | |
381 | } | |
382 | ||
383 | static int winbond_gpio_get(struct gpio_chip *gc, unsigned int offset) | |
384 | { | |
385 | unsigned long *base = gpiochip_get_data(gc); | |
386 | const struct winbond_gpio_info *info; | |
387 | bool val; | |
9ca766ea | 388 | int ret; |
a0d65009 MS |
389 | |
390 | winbond_gpio_get_info(&offset, &info); | |
391 | ||
9ca766ea DC |
392 | ret = winbond_sio_enter(*base); |
393 | if (ret) | |
394 | return ret; | |
a0d65009 MS |
395 | |
396 | winbond_sio_select_logical(*base, info->dev); | |
397 | ||
398 | val = winbond_sio_reg_btest(*base, info->datareg, offset); | |
399 | if (winbond_sio_reg_btest(*base, info->invreg, offset)) | |
400 | val = !val; | |
401 | ||
402 | winbond_sio_leave(*base); | |
403 | ||
404 | return val; | |
405 | } | |
406 | ||
407 | static int winbond_gpio_direction_in(struct gpio_chip *gc, unsigned int offset) | |
408 | { | |
409 | unsigned long *base = gpiochip_get_data(gc); | |
410 | const struct winbond_gpio_info *info; | |
411 | int ret; | |
412 | ||
413 | if (!winbond_gpio_get_info(&offset, &info)) | |
414 | return -EACCES; | |
415 | ||
416 | ret = winbond_sio_enter(*base); | |
417 | if (ret) | |
418 | return ret; | |
419 | ||
420 | winbond_sio_select_logical(*base, info->dev); | |
421 | ||
422 | winbond_sio_reg_bset(*base, info->ioreg, offset); | |
423 | ||
424 | winbond_sio_leave(*base); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static int winbond_gpio_direction_out(struct gpio_chip *gc, | |
430 | unsigned int offset, | |
431 | int val) | |
432 | { | |
433 | unsigned long *base = gpiochip_get_data(gc); | |
434 | const struct winbond_gpio_info *info; | |
435 | int ret; | |
436 | ||
437 | if (!winbond_gpio_get_info(&offset, &info)) | |
438 | return -EACCES; | |
439 | ||
440 | ret = winbond_sio_enter(*base); | |
441 | if (ret) | |
442 | return ret; | |
443 | ||
444 | winbond_sio_select_logical(*base, info->dev); | |
445 | ||
446 | winbond_sio_reg_bclear(*base, info->ioreg, offset); | |
447 | ||
448 | if (winbond_sio_reg_btest(*base, info->invreg, offset)) | |
449 | val = !val; | |
450 | ||
451 | if (val) | |
452 | winbond_sio_reg_bset(*base, info->datareg, offset); | |
453 | else | |
454 | winbond_sio_reg_bclear(*base, info->datareg, offset); | |
455 | ||
456 | winbond_sio_leave(*base); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static void winbond_gpio_set(struct gpio_chip *gc, unsigned int offset, | |
462 | int val) | |
463 | { | |
464 | unsigned long *base = gpiochip_get_data(gc); | |
465 | const struct winbond_gpio_info *info; | |
466 | ||
467 | if (!winbond_gpio_get_info(&offset, &info)) | |
468 | return; | |
469 | ||
470 | if (winbond_sio_enter(*base) != 0) | |
471 | return; | |
472 | ||
473 | winbond_sio_select_logical(*base, info->dev); | |
474 | ||
475 | if (winbond_sio_reg_btest(*base, info->invreg, offset)) | |
476 | val = !val; | |
477 | ||
478 | if (val) | |
479 | winbond_sio_reg_bset(*base, info->datareg, offset); | |
480 | else | |
481 | winbond_sio_reg_bclear(*base, info->datareg, offset); | |
482 | ||
483 | winbond_sio_leave(*base); | |
484 | } | |
485 | ||
486 | static struct gpio_chip winbond_gpio_chip = { | |
487 | .base = -1, | |
488 | .label = WB_GPIO_DRIVER_NAME, | |
489 | .owner = THIS_MODULE, | |
490 | .can_sleep = true, | |
491 | .get = winbond_gpio_get, | |
492 | .direction_input = winbond_gpio_direction_in, | |
493 | .set = winbond_gpio_set, | |
494 | .direction_output = winbond_gpio_direction_out, | |
495 | }; | |
496 | ||
497 | static void winbond_gpio_configure_port0_pins(unsigned long base) | |
498 | { | |
499 | unsigned int val; | |
500 | ||
501 | val = winbond_sio_reg_read(base, WB_SIO_REG_GPIO1_MF); | |
502 | if ((val & WB_SIO_REG_G1MF_FS_MASK) == WB_SIO_REG_G1MF_FS_GPIO1) | |
503 | return; | |
504 | ||
505 | pr_warn("GPIO1 pins were connected to something else (%.2x), fixing\n", | |
506 | val); | |
507 | ||
508 | val &= ~WB_SIO_REG_G1MF_FS_MASK; | |
509 | val |= WB_SIO_REG_G1MF_FS_GPIO1; | |
510 | ||
511 | winbond_sio_reg_write(base, WB_SIO_REG_GPIO1_MF, val); | |
512 | } | |
513 | ||
514 | static void winbond_gpio_configure_port1_check_i2c(unsigned long base) | |
515 | { | |
516 | params.i2cgpio = !winbond_sio_reg_btest(base, WB_SIO_REG_I2C_PS, | |
517 | WB_SIO_REG_I2CPS_I2CFS); | |
518 | if (!params.i2cgpio) | |
519 | pr_warn("disabling GPIO2.5 and GPIO2.6 as I2C is enabled\n"); | |
520 | } | |
521 | ||
522 | static bool winbond_gpio_configure_port(unsigned long base, unsigned int idx) | |
523 | { | |
524 | const struct winbond_gpio_info *info = &winbond_gpio_infos[idx]; | |
525 | const struct winbond_gpio_port_conflict *conflict = &info->conflict; | |
526 | ||
527 | /* is there a possible conflicting device defined? */ | |
528 | if (conflict->name != NULL) { | |
529 | if (conflict->dev != WB_SIO_DEV_NONE) | |
530 | winbond_sio_select_logical(base, conflict->dev); | |
531 | ||
532 | if (winbond_sio_reg_btest(base, conflict->testreg, | |
533 | conflict->testbit)) { | |
534 | if (conflict->warnonly) | |
535 | pr_warn("enabled GPIO%u share pins with active %s\n", | |
536 | idx + 1, conflict->name); | |
537 | else { | |
538 | pr_warn("disabling GPIO%u as %s is enabled\n", | |
539 | idx + 1, conflict->name); | |
540 | return false; | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | /* GPIO1 and GPIO2 need some (additional) special handling */ | |
546 | if (idx == 0) | |
547 | winbond_gpio_configure_port0_pins(base); | |
548 | else if (idx == 1) | |
549 | winbond_gpio_configure_port1_check_i2c(base); | |
550 | ||
551 | winbond_sio_select_logical(base, info->dev); | |
552 | ||
553 | winbond_sio_reg_bset(base, info->enablereg, info->enablebit); | |
554 | ||
555 | if (params.ppgpios & BIT(idx)) | |
556 | winbond_sio_reg_bset(base, info->outputreg, | |
557 | info->outputppbit); | |
558 | else if (params.odgpios & BIT(idx)) | |
559 | winbond_sio_reg_bclear(base, info->outputreg, | |
560 | info->outputppbit); | |
561 | else | |
562 | pr_notice("GPIO%u pins are %s\n", idx + 1, | |
563 | winbond_sio_reg_btest(base, info->outputreg, | |
564 | info->outputppbit) ? | |
565 | "push-pull" : | |
566 | "open drain"); | |
567 | ||
568 | return true; | |
569 | } | |
570 | ||
571 | static int winbond_gpio_configure(unsigned long base) | |
572 | { | |
573 | unsigned long i; | |
574 | ||
575 | for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG) | |
576 | if (!winbond_gpio_configure_port(base, i)) | |
577 | __clear_bit(i, ¶ms.gpios); | |
578 | ||
579 | if (!params.gpios) { | |
580 | pr_err("please use 'gpios' module parameter to select some active GPIO ports to enable\n"); | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static int winbond_gpio_check_chip(unsigned long base) | |
588 | { | |
589 | int ret; | |
590 | unsigned int chip; | |
591 | ||
592 | ret = winbond_sio_enter(base); | |
593 | if (ret) | |
594 | return ret; | |
595 | ||
596 | chip = winbond_sio_reg_read(base, WB_SIO_REG_CHIP_MSB) << 8; | |
597 | chip |= winbond_sio_reg_read(base, WB_SIO_REG_CHIP_LSB); | |
598 | ||
599 | pr_notice("chip ID at %lx is %.4x\n", base, chip); | |
600 | ||
601 | if ((chip & WB_SIO_CHIP_ID_W83627UHG_MASK) != | |
602 | WB_SIO_CHIP_ID_W83627UHG) { | |
603 | pr_err("not an our chip\n"); | |
604 | ret = -ENODEV; | |
605 | } | |
606 | ||
607 | winbond_sio_leave(base); | |
608 | ||
609 | return ret; | |
610 | } | |
611 | ||
612 | static int winbond_gpio_imatch(struct device *dev, unsigned int id) | |
613 | { | |
614 | unsigned long gpios_rem; | |
615 | int ret; | |
616 | ||
617 | gpios_rem = params.gpios & ~GENMASK(ARRAY_SIZE(winbond_gpio_infos) - 1, | |
618 | 0); | |
619 | if (gpios_rem) { | |
620 | pr_warn("unknown ports (%lx) enabled in GPIO ports bitmask\n", | |
621 | gpios_rem); | |
622 | params.gpios &= ~gpios_rem; | |
623 | } | |
624 | ||
625 | if (params.ppgpios & params.odgpios) { | |
626 | pr_err("some GPIO ports are set both to push-pull and open drain mode at the same time\n"); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | if (params.base != 0) | |
631 | return winbond_gpio_check_chip(params.base) == 0; | |
632 | ||
633 | /* | |
634 | * if the 'base' module parameter is unset probe two chip default | |
635 | * I/O port bases | |
636 | */ | |
637 | params.base = WB_SIO_BASE; | |
638 | ret = winbond_gpio_check_chip(params.base); | |
639 | if (ret == 0) | |
640 | return 1; | |
641 | if (ret != -ENODEV && ret != -EBUSY) | |
642 | return 0; | |
643 | ||
644 | params.base = WB_SIO_BASE_HIGH; | |
645 | return winbond_gpio_check_chip(params.base) == 0; | |
646 | } | |
647 | ||
648 | static int winbond_gpio_iprobe(struct device *dev, unsigned int id) | |
649 | { | |
650 | int ret; | |
651 | ||
652 | if (params.base == 0) | |
653 | return -EINVAL; | |
654 | ||
655 | ret = winbond_sio_enter(params.base); | |
656 | if (ret) | |
657 | return ret; | |
658 | ||
659 | ret = winbond_gpio_configure(params.base); | |
660 | ||
661 | winbond_sio_leave(params.base); | |
662 | ||
663 | if (ret) | |
664 | return ret; | |
665 | ||
666 | /* | |
667 | * Add 8 gpios for every GPIO port that was enabled in gpios | |
668 | * module parameter (that wasn't disabled earlier in | |
669 | * winbond_gpio_configure() & co. due to, for example, a pin conflict). | |
670 | */ | |
671 | winbond_gpio_chip.ngpio = hweight_long(params.gpios) * 8; | |
672 | ||
673 | /* | |
674 | * GPIO6 port has only 5 pins, so if it is enabled we have to adjust | |
675 | * the total count appropriately | |
676 | */ | |
677 | if (params.gpios & BIT(5)) | |
678 | winbond_gpio_chip.ngpio -= (8 - 5); | |
679 | ||
680 | winbond_gpio_chip.parent = dev; | |
681 | ||
682 | return devm_gpiochip_add_data(dev, &winbond_gpio_chip, ¶ms.base); | |
683 | } | |
684 | ||
685 | static struct isa_driver winbond_gpio_idriver = { | |
686 | .driver = { | |
687 | .name = WB_GPIO_DRIVER_NAME, | |
688 | }, | |
689 | .match = winbond_gpio_imatch, | |
690 | .probe = winbond_gpio_iprobe, | |
691 | }; | |
692 | ||
693 | module_isa_driver(winbond_gpio_idriver, 1); | |
694 | ||
695 | module_param_named(base, params.base, ulong, 0444); | |
696 | MODULE_PARM_DESC(base, | |
697 | "I/O port base (when unset - probe chip default ones)"); | |
698 | ||
699 | /* This parameter sets which GPIO devices (ports) we enable */ | |
700 | module_param_named(gpios, params.gpios, ulong, 0444); | |
701 | MODULE_PARM_DESC(gpios, | |
702 | "bitmask of GPIO ports to enable (bit 0 - GPIO1, bit 1 - GPIO2, etc."); | |
703 | ||
704 | /* | |
705 | * These two parameters below set how we configure GPIO ports output drivers. | |
706 | * It can't be a one bitmask since we need three values per port: push-pull, | |
707 | * open-drain and keep as-is (this is the default). | |
708 | */ | |
709 | module_param_named(ppgpios, params.ppgpios, ulong, 0444); | |
710 | MODULE_PARM_DESC(ppgpios, | |
711 | "bitmask of GPIO ports to set to push-pull mode (bit 0 - GPIO1, bit 1 - GPIO2, etc."); | |
712 | ||
713 | module_param_named(odgpios, params.odgpios, ulong, 0444); | |
714 | MODULE_PARM_DESC(odgpios, | |
715 | "bitmask of GPIO ports to set to open drain mode (bit 0 - GPIO1, bit 1 - GPIO2, etc."); | |
716 | ||
717 | /* | |
718 | * GPIO2.0 and GPIO2.1 control a basic PC functionality that we | |
719 | * don't allow tinkering with by default (it is very likely that the | |
720 | * firmware owns these pins). | |
721 | * These two parameters below allow overriding these prohibitions. | |
722 | */ | |
723 | module_param_named(pledgpio, params.pledgpio, bool, 0644); | |
724 | MODULE_PARM_DESC(pledgpio, | |
725 | "enable changing value of GPIO2.0 bit (Power LED), default no."); | |
726 | ||
727 | module_param_named(beepgpio, params.beepgpio, bool, 0644); | |
728 | MODULE_PARM_DESC(beepgpio, | |
729 | "enable changing value of GPIO2.1 bit (BEEP), default no."); | |
730 | ||
731 | MODULE_AUTHOR("Maciej S. Szmigiero <mail@maciej.szmigiero.name>"); | |
732 | MODULE_DESCRIPTION("GPIO interface for Winbond Super I/O chips"); | |
733 | MODULE_LICENSE("GPL"); |