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Commit | Line | Data |
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b685004f RM |
1 | /* |
2 | * linux/arch/arm/mach-ep93xx/gpio.c | |
3 | * | |
4 | * Generic EP93xx GPIO handling | |
5 | * | |
6 | * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com> | |
7 | * | |
8 | * Based on code originally from: | |
9 | * linux/arch/arm/mach-ep93xx/core.c | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
d056ab78 HS |
16 | #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt |
17 | ||
b685004f RM |
18 | #include <linux/init.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/seq_file.h> | |
fced80c7 | 21 | #include <linux/io.h> |
ddf4f3d9 | 22 | #include <linux/gpio.h> |
595c050d | 23 | #include <linux/irq.h> |
b685004f | 24 | |
ddf4f3d9 | 25 | #include <mach/hardware.h> |
b685004f | 26 | |
d056ab78 | 27 | /************************************************************************* |
4742723c | 28 | * Interrupt handling for EP93xx on-chip GPIOs |
d056ab78 HS |
29 | *************************************************************************/ |
30 | static unsigned char gpio_int_unmasked[3]; | |
31 | static unsigned char gpio_int_enabled[3]; | |
32 | static unsigned char gpio_int_type1[3]; | |
33 | static unsigned char gpio_int_type2[3]; | |
34 | static unsigned char gpio_int_debounce[3]; | |
35 | ||
36 | /* Port ordering is: A B F */ | |
37 | static const u8 int_type1_register_offset[3] = { 0x90, 0xac, 0x4c }; | |
38 | static const u8 int_type2_register_offset[3] = { 0x94, 0xb0, 0x50 }; | |
39 | static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 }; | |
40 | static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 }; | |
41 | static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 }; | |
42 | ||
4742723c | 43 | static void ep93xx_gpio_update_int_params(unsigned port) |
d056ab78 HS |
44 | { |
45 | BUG_ON(port > 2); | |
46 | ||
47 | __raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port])); | |
48 | ||
49 | __raw_writeb(gpio_int_type2[port], | |
50 | EP93XX_GPIO_REG(int_type2_register_offset[port])); | |
51 | ||
52 | __raw_writeb(gpio_int_type1[port], | |
53 | EP93XX_GPIO_REG(int_type1_register_offset[port])); | |
54 | ||
55 | __raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port], | |
56 | EP93XX_GPIO_REG(int_en_register_offset[port])); | |
57 | } | |
58 | ||
4742723c | 59 | static inline void ep93xx_gpio_int_mask(unsigned line) |
d056ab78 HS |
60 | { |
61 | gpio_int_unmasked[line >> 3] &= ~(1 << (line & 7)); | |
62 | } | |
63 | ||
5d046af0 | 64 | static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable) |
d056ab78 HS |
65 | { |
66 | int line = irq_to_gpio(irq); | |
67 | int port = line >> 3; | |
68 | int port_mask = 1 << (line & 7); | |
69 | ||
70 | if (enable) | |
71 | gpio_int_debounce[port] |= port_mask; | |
72 | else | |
73 | gpio_int_debounce[port] &= ~port_mask; | |
74 | ||
75 | __raw_writeb(gpio_int_debounce[port], | |
76 | EP93XX_GPIO_REG(int_debounce_register_offset[port])); | |
77 | } | |
d056ab78 HS |
78 | |
79 | static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc) | |
80 | { | |
81 | unsigned char status; | |
82 | int i; | |
83 | ||
84 | status = __raw_readb(EP93XX_GPIO_A_INT_STATUS); | |
85 | for (i = 0; i < 8; i++) { | |
86 | if (status & (1 << i)) { | |
87 | int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i; | |
88 | generic_handle_irq(gpio_irq); | |
89 | } | |
90 | } | |
91 | ||
92 | status = __raw_readb(EP93XX_GPIO_B_INT_STATUS); | |
93 | for (i = 0; i < 8; i++) { | |
94 | if (status & (1 << i)) { | |
95 | int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i; | |
96 | generic_handle_irq(gpio_irq); | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
101 | static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc) | |
102 | { | |
103 | /* | |
104 | * map discontiguous hw irq range to continous sw irq range: | |
105 | * | |
106 | * IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7}) | |
107 | */ | |
108 | int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */ | |
109 | int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx; | |
110 | ||
111 | generic_handle_irq(gpio_irq); | |
112 | } | |
113 | ||
c0afc916 | 114 | static void ep93xx_gpio_irq_ack(struct irq_data *d) |
d056ab78 | 115 | { |
c0afc916 | 116 | int line = irq_to_gpio(d->irq); |
d056ab78 HS |
117 | int port = line >> 3; |
118 | int port_mask = 1 << (line & 7); | |
119 | ||
d1735a2e | 120 | if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) { |
d056ab78 HS |
121 | gpio_int_type2[port] ^= port_mask; /* switch edge direction */ |
122 | ep93xx_gpio_update_int_params(port); | |
123 | } | |
124 | ||
125 | __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port])); | |
126 | } | |
127 | ||
c0afc916 | 128 | static void ep93xx_gpio_irq_mask_ack(struct irq_data *d) |
d056ab78 | 129 | { |
c0afc916 | 130 | int line = irq_to_gpio(d->irq); |
d056ab78 HS |
131 | int port = line >> 3; |
132 | int port_mask = 1 << (line & 7); | |
133 | ||
d1735a2e | 134 | if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) |
d056ab78 HS |
135 | gpio_int_type2[port] ^= port_mask; /* switch edge direction */ |
136 | ||
137 | gpio_int_unmasked[port] &= ~port_mask; | |
138 | ep93xx_gpio_update_int_params(port); | |
139 | ||
140 | __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port])); | |
141 | } | |
142 | ||
c0afc916 | 143 | static void ep93xx_gpio_irq_mask(struct irq_data *d) |
d056ab78 | 144 | { |
c0afc916 | 145 | int line = irq_to_gpio(d->irq); |
d056ab78 HS |
146 | int port = line >> 3; |
147 | ||
148 | gpio_int_unmasked[port] &= ~(1 << (line & 7)); | |
149 | ep93xx_gpio_update_int_params(port); | |
150 | } | |
151 | ||
c0afc916 | 152 | static void ep93xx_gpio_irq_unmask(struct irq_data *d) |
d056ab78 | 153 | { |
c0afc916 | 154 | int line = irq_to_gpio(d->irq); |
d056ab78 HS |
155 | int port = line >> 3; |
156 | ||
157 | gpio_int_unmasked[port] |= 1 << (line & 7); | |
158 | ep93xx_gpio_update_int_params(port); | |
159 | } | |
160 | ||
161 | /* | |
162 | * gpio_int_type1 controls whether the interrupt is level (0) or | |
163 | * edge (1) triggered, while gpio_int_type2 controls whether it | |
164 | * triggers on low/falling (0) or high/rising (1). | |
165 | */ | |
c0afc916 | 166 | static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type) |
d056ab78 | 167 | { |
c0afc916 | 168 | const int gpio = irq_to_gpio(d->irq); |
d056ab78 HS |
169 | const int port = gpio >> 3; |
170 | const int port_mask = 1 << (gpio & 7); | |
d1735a2e | 171 | irq_flow_handler_t handler; |
d056ab78 HS |
172 | |
173 | gpio_direction_input(gpio); | |
174 | ||
175 | switch (type) { | |
176 | case IRQ_TYPE_EDGE_RISING: | |
177 | gpio_int_type1[port] |= port_mask; | |
178 | gpio_int_type2[port] |= port_mask; | |
d1735a2e | 179 | handler = handle_edge_irq; |
d056ab78 HS |
180 | break; |
181 | case IRQ_TYPE_EDGE_FALLING: | |
182 | gpio_int_type1[port] |= port_mask; | |
183 | gpio_int_type2[port] &= ~port_mask; | |
d1735a2e | 184 | handler = handle_edge_irq; |
d056ab78 HS |
185 | break; |
186 | case IRQ_TYPE_LEVEL_HIGH: | |
187 | gpio_int_type1[port] &= ~port_mask; | |
188 | gpio_int_type2[port] |= port_mask; | |
d1735a2e | 189 | handler = handle_level_irq; |
d056ab78 HS |
190 | break; |
191 | case IRQ_TYPE_LEVEL_LOW: | |
192 | gpio_int_type1[port] &= ~port_mask; | |
193 | gpio_int_type2[port] &= ~port_mask; | |
d1735a2e | 194 | handler = handle_level_irq; |
d056ab78 HS |
195 | break; |
196 | case IRQ_TYPE_EDGE_BOTH: | |
197 | gpio_int_type1[port] |= port_mask; | |
198 | /* set initial polarity based on current input level */ | |
199 | if (gpio_get_value(gpio)) | |
200 | gpio_int_type2[port] &= ~port_mask; /* falling */ | |
201 | else | |
202 | gpio_int_type2[port] |= port_mask; /* rising */ | |
d1735a2e | 203 | handler = handle_edge_irq; |
d056ab78 HS |
204 | break; |
205 | default: | |
206 | pr_err("failed to set irq type %d for gpio %d\n", type, gpio); | |
207 | return -EINVAL; | |
208 | } | |
209 | ||
d1735a2e | 210 | __irq_set_handler_locked(d->irq, handler); |
d056ab78 | 211 | |
d1735a2e | 212 | gpio_int_enabled[port] |= port_mask; |
d056ab78 HS |
213 | |
214 | ep93xx_gpio_update_int_params(port); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static struct irq_chip ep93xx_gpio_irq_chip = { | |
220 | .name = "GPIO", | |
c0afc916 LB |
221 | .irq_ack = ep93xx_gpio_irq_ack, |
222 | .irq_mask_ack = ep93xx_gpio_irq_mask_ack, | |
223 | .irq_mask = ep93xx_gpio_irq_mask, | |
224 | .irq_unmask = ep93xx_gpio_irq_unmask, | |
225 | .irq_set_type = ep93xx_gpio_irq_type, | |
d056ab78 HS |
226 | }; |
227 | ||
228 | void __init ep93xx_gpio_init_irq(void) | |
229 | { | |
230 | int gpio_irq; | |
231 | ||
232 | for (gpio_irq = gpio_to_irq(0); | |
233 | gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) { | |
f38c02f3 TG |
234 | irq_set_chip_and_handler(gpio_irq, &ep93xx_gpio_irq_chip, |
235 | handle_level_irq); | |
d056ab78 HS |
236 | set_irq_flags(gpio_irq, IRQF_VALID); |
237 | } | |
238 | ||
6845664a TG |
239 | irq_set_chained_handler(IRQ_EP93XX_GPIO_AB, |
240 | ep93xx_gpio_ab_irq_handler); | |
241 | irq_set_chained_handler(IRQ_EP93XX_GPIO0MUX, | |
242 | ep93xx_gpio_f_irq_handler); | |
243 | irq_set_chained_handler(IRQ_EP93XX_GPIO1MUX, | |
244 | ep93xx_gpio_f_irq_handler); | |
245 | irq_set_chained_handler(IRQ_EP93XX_GPIO2MUX, | |
246 | ep93xx_gpio_f_irq_handler); | |
247 | irq_set_chained_handler(IRQ_EP93XX_GPIO3MUX, | |
248 | ep93xx_gpio_f_irq_handler); | |
249 | irq_set_chained_handler(IRQ_EP93XX_GPIO4MUX, | |
250 | ep93xx_gpio_f_irq_handler); | |
251 | irq_set_chained_handler(IRQ_EP93XX_GPIO5MUX, | |
252 | ep93xx_gpio_f_irq_handler); | |
253 | irq_set_chained_handler(IRQ_EP93XX_GPIO6MUX, | |
254 | ep93xx_gpio_f_irq_handler); | |
255 | irq_set_chained_handler(IRQ_EP93XX_GPIO7MUX, | |
256 | ep93xx_gpio_f_irq_handler); | |
d056ab78 HS |
257 | } |
258 | ||
259 | ||
260 | /************************************************************************* | |
261 | * gpiolib interface for EP93xx on-chip GPIOs | |
262 | *************************************************************************/ | |
b685004f RM |
263 | struct ep93xx_gpio_chip { |
264 | struct gpio_chip chip; | |
265 | ||
ddf4f3d9 HS |
266 | void __iomem *data_reg; |
267 | void __iomem *data_dir_reg; | |
b685004f RM |
268 | }; |
269 | ||
270 | #define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip) | |
271 | ||
b685004f RM |
272 | static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
273 | { | |
274 | struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | |
275 | unsigned long flags; | |
276 | u8 v; | |
277 | ||
278 | local_irq_save(flags); | |
279 | v = __raw_readb(ep93xx_chip->data_dir_reg); | |
280 | v &= ~(1 << offset); | |
281 | __raw_writeb(v, ep93xx_chip->data_dir_reg); | |
282 | local_irq_restore(flags); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int ep93xx_gpio_direction_output(struct gpio_chip *chip, | |
288 | unsigned offset, int val) | |
289 | { | |
290 | struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | |
291 | unsigned long flags; | |
292 | int line; | |
293 | u8 v; | |
294 | ||
295 | local_irq_save(flags); | |
296 | ||
297 | /* Set the value */ | |
298 | v = __raw_readb(ep93xx_chip->data_reg); | |
299 | if (val) | |
300 | v |= (1 << offset); | |
301 | else | |
302 | v &= ~(1 << offset); | |
303 | __raw_writeb(v, ep93xx_chip->data_reg); | |
304 | ||
305 | /* Drive as an output */ | |
306 | line = chip->base + offset; | |
307 | if (line <= EP93XX_GPIO_LINE_MAX_IRQ) { | |
308 | /* Ports A/B/F */ | |
309 | ep93xx_gpio_int_mask(line); | |
310 | ep93xx_gpio_update_int_params(line >> 3); | |
311 | } | |
312 | ||
313 | v = __raw_readb(ep93xx_chip->data_dir_reg); | |
314 | v |= (1 << offset); | |
315 | __raw_writeb(v, ep93xx_chip->data_dir_reg); | |
316 | ||
317 | local_irq_restore(flags); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset) | |
323 | { | |
324 | struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | |
325 | ||
326 | return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset)); | |
327 | } | |
328 | ||
329 | static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val) | |
330 | { | |
331 | struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | |
332 | unsigned long flags; | |
333 | u8 v; | |
334 | ||
335 | local_irq_save(flags); | |
336 | v = __raw_readb(ep93xx_chip->data_reg); | |
337 | if (val) | |
338 | v |= (1 << offset); | |
339 | else | |
340 | v &= ~(1 << offset); | |
341 | __raw_writeb(v, ep93xx_chip->data_reg); | |
342 | local_irq_restore(flags); | |
343 | } | |
344 | ||
5d046af0 HS |
345 | static int ep93xx_gpio_set_debounce(struct gpio_chip *chip, |
346 | unsigned offset, unsigned debounce) | |
347 | { | |
348 | int gpio = chip->base + offset; | |
349 | int irq = gpio_to_irq(gpio); | |
350 | ||
351 | if (irq < 0) | |
352 | return -EINVAL; | |
353 | ||
354 | ep93xx_gpio_int_debounce(irq, debounce ? true : false); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
b685004f RM |
359 | static void ep93xx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
360 | { | |
361 | struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | |
362 | u8 data_reg, data_dir_reg; | |
f04989bb | 363 | int gpio, i; |
b685004f RM |
364 | |
365 | data_reg = __raw_readb(ep93xx_chip->data_reg); | |
366 | data_dir_reg = __raw_readb(ep93xx_chip->data_dir_reg); | |
367 | ||
f04989bb HS |
368 | gpio = ep93xx_chip->chip.base; |
369 | for (i = 0; i < chip->ngpio; i++, gpio++) { | |
370 | int is_out = data_dir_reg & (1 << i); | |
778b548c | 371 | int irq = gpio_to_irq(gpio); |
f04989bb | 372 | |
778b548c | 373 | seq_printf(s, " %s%d gpio-%-3d (%-12s) %s %s %s\n", |
f04989bb HS |
374 | chip->label, i, gpio, |
375 | gpiochip_is_requested(chip, i) ? : "", | |
376 | is_out ? "out" : "in ", | |
778b548c RM |
377 | (data_reg & (1<< i)) ? "hi" : "lo", |
378 | (!is_out && irq>= 0) ? "(interrupt)" : ""); | |
f04989bb | 379 | } |
b685004f RM |
380 | } |
381 | ||
382 | #define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio) \ | |
383 | { \ | |
384 | .chip = { \ | |
385 | .label = name, \ | |
386 | .direction_input = ep93xx_gpio_direction_input, \ | |
387 | .direction_output = ep93xx_gpio_direction_output, \ | |
388 | .get = ep93xx_gpio_get, \ | |
389 | .set = ep93xx_gpio_set, \ | |
390 | .dbg_show = ep93xx_gpio_dbg_show, \ | |
391 | .base = base_gpio, \ | |
392 | .ngpio = 8, \ | |
393 | }, \ | |
394 | .data_reg = EP93XX_GPIO_REG(dr), \ | |
395 | .data_dir_reg = EP93XX_GPIO_REG(ddr), \ | |
396 | } | |
397 | ||
398 | static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = { | |
399 | EP93XX_GPIO_BANK("A", 0x00, 0x10, 0), | |
400 | EP93XX_GPIO_BANK("B", 0x04, 0x14, 8), | |
7a1f3701 | 401 | EP93XX_GPIO_BANK("C", 0x08, 0x18, 40), |
b685004f RM |
402 | EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24), |
403 | EP93XX_GPIO_BANK("E", 0x20, 0x24, 32), | |
7a1f3701 | 404 | EP93XX_GPIO_BANK("F", 0x30, 0x34, 16), |
b685004f RM |
405 | EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48), |
406 | EP93XX_GPIO_BANK("H", 0x40, 0x44, 56), | |
407 | }; | |
408 | ||
409 | void __init ep93xx_gpio_init(void) | |
410 | { | |
411 | int i; | |
412 | ||
fd015480 HS |
413 | /* Set Ports C, D, E, G, and H for GPIO use */ |
414 | ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS | | |
415 | EP93XX_SYSCON_DEVCFG_GONK | | |
416 | EP93XX_SYSCON_DEVCFG_EONIDE | | |
417 | EP93XX_SYSCON_DEVCFG_GONIDE | | |
418 | EP93XX_SYSCON_DEVCFG_HONIDE); | |
419 | ||
5d046af0 HS |
420 | for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) { |
421 | struct gpio_chip *chip = &ep93xx_gpio_banks[i].chip; | |
422 | ||
423 | /* | |
424 | * Ports A, B, and F support input debouncing when | |
425 | * used as interrupts. | |
426 | */ | |
427 | if (!strcmp(chip->label, "A") || | |
428 | !strcmp(chip->label, "B") || | |
429 | !strcmp(chip->label, "F")) | |
430 | chip->set_debounce = ep93xx_gpio_set_debounce; | |
431 | ||
432 | gpiochip_add(chip); | |
433 | } | |
b685004f | 434 | } |