Commit | Line | Data |
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3d9edf09 VB |
1 | /* |
2 | * TI DaVinci GPIO Support | |
3 | * | |
dce1115b | 4 | * Copyright (c) 2006-2007 David Brownell |
3d9edf09 VB |
5 | * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/errno.h> | |
14 | #include <linux/kernel.h> | |
3d9edf09 VB |
15 | #include <linux/clk.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/io.h> | |
3d9edf09 | 18 | |
a09e64fb | 19 | #include <mach/gpio.h> |
3d9edf09 VB |
20 | |
21 | #include <asm/mach/irq.h> | |
22 | ||
c12f415a CC |
23 | struct davinci_gpio_regs { |
24 | u32 dir; | |
25 | u32 out_data; | |
26 | u32 set_data; | |
27 | u32 clr_data; | |
28 | u32 in_data; | |
29 | u32 set_rising; | |
30 | u32 clr_rising; | |
31 | u32 set_falling; | |
32 | u32 clr_falling; | |
33 | u32 intstat; | |
34 | }; | |
35 | ||
ba4a984e | 36 | #define chip2controller(chip) \ |
99e9e52d | 37 | container_of(chip, struct davinci_gpio_controller, chip) |
ba4a984e | 38 | |
99e9e52d | 39 | static struct davinci_gpio_controller chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)]; |
b8d44293 | 40 | static void __iomem *gpio_base; |
3d9edf09 | 41 | |
99e9e52d | 42 | static struct davinci_gpio_regs __iomem __init *gpio2regs(unsigned gpio) |
3d9edf09 | 43 | { |
c12f415a | 44 | void __iomem *ptr; |
c12f415a CC |
45 | |
46 | if (gpio < 32 * 1) | |
b8d44293 | 47 | ptr = gpio_base + 0x10; |
c12f415a | 48 | else if (gpio < 32 * 2) |
b8d44293 | 49 | ptr = gpio_base + 0x38; |
c12f415a | 50 | else if (gpio < 32 * 3) |
b8d44293 | 51 | ptr = gpio_base + 0x60; |
c12f415a | 52 | else if (gpio < 32 * 4) |
b8d44293 | 53 | ptr = gpio_base + 0x88; |
c12f415a | 54 | else if (gpio < 32 * 5) |
b8d44293 | 55 | ptr = gpio_base + 0xb0; |
c12f415a CC |
56 | else |
57 | ptr = NULL; | |
58 | return ptr; | |
3d9edf09 VB |
59 | } |
60 | ||
99e9e52d | 61 | static inline struct davinci_gpio_regs __iomem *irq2regs(int irq) |
21ce873d | 62 | { |
99e9e52d | 63 | struct davinci_gpio_regs __iomem *g; |
21ce873d | 64 | |
6845664a | 65 | g = (__force struct davinci_gpio_regs __iomem *)irq_get_chip_data(irq); |
21ce873d KH |
66 | |
67 | return g; | |
68 | } | |
69 | ||
dc756026 | 70 | static int __init davinci_gpio_irq_setup(void); |
dce1115b DB |
71 | |
72 | /*--------------------------------------------------------------------------*/ | |
73 | ||
5b3a05ca | 74 | /* board setup code *MUST* setup pinmux and enable the GPIO clock. */ |
ba4a984e CC |
75 | static inline int __davinci_direction(struct gpio_chip *chip, |
76 | unsigned offset, bool out, int value) | |
3d9edf09 | 77 | { |
99e9e52d CC |
78 | struct davinci_gpio_controller *d = chip2controller(chip); |
79 | struct davinci_gpio_regs __iomem *g = d->regs; | |
b27b6d03 | 80 | unsigned long flags; |
dce1115b | 81 | u32 temp; |
ba4a984e | 82 | u32 mask = 1 << offset; |
3d9edf09 | 83 | |
b27b6d03 | 84 | spin_lock_irqsave(&d->lock, flags); |
dce1115b | 85 | temp = __raw_readl(&g->dir); |
ba4a984e CC |
86 | if (out) { |
87 | temp &= ~mask; | |
88 | __raw_writel(mask, value ? &g->set_data : &g->clr_data); | |
89 | } else { | |
90 | temp |= mask; | |
91 | } | |
dce1115b | 92 | __raw_writel(temp, &g->dir); |
b27b6d03 | 93 | spin_unlock_irqrestore(&d->lock, flags); |
3d9edf09 | 94 | |
dce1115b DB |
95 | return 0; |
96 | } | |
3d9edf09 | 97 | |
ba4a984e CC |
98 | static int davinci_direction_in(struct gpio_chip *chip, unsigned offset) |
99 | { | |
100 | return __davinci_direction(chip, offset, false, 0); | |
101 | } | |
102 | ||
103 | static int | |
104 | davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value) | |
105 | { | |
106 | return __davinci_direction(chip, offset, true, value); | |
107 | } | |
108 | ||
3d9edf09 VB |
109 | /* |
110 | * Read the pin's value (works even if it's set up as output); | |
111 | * returns zero/nonzero. | |
112 | * | |
113 | * Note that changes are synched to the GPIO clock, so reading values back | |
114 | * right after you've set them may give old values. | |
115 | */ | |
dce1115b | 116 | static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset) |
3d9edf09 | 117 | { |
99e9e52d CC |
118 | struct davinci_gpio_controller *d = chip2controller(chip); |
119 | struct davinci_gpio_regs __iomem *g = d->regs; | |
3d9edf09 | 120 | |
dce1115b | 121 | return (1 << offset) & __raw_readl(&g->in_data); |
3d9edf09 | 122 | } |
3d9edf09 | 123 | |
dce1115b DB |
124 | /* |
125 | * Assuming the pin is muxed as a gpio output, set its output value. | |
126 | */ | |
127 | static void | |
128 | davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
3d9edf09 | 129 | { |
99e9e52d CC |
130 | struct davinci_gpio_controller *d = chip2controller(chip); |
131 | struct davinci_gpio_regs __iomem *g = d->regs; | |
3d9edf09 | 132 | |
dce1115b DB |
133 | __raw_writel((1 << offset), value ? &g->set_data : &g->clr_data); |
134 | } | |
135 | ||
136 | static int __init davinci_gpio_setup(void) | |
137 | { | |
138 | int i, base; | |
a994955c MG |
139 | unsigned ngpio; |
140 | struct davinci_soc_info *soc_info = &davinci_soc_info; | |
c12f415a | 141 | struct davinci_gpio_regs *regs; |
dce1115b | 142 | |
686b634a CC |
143 | if (soc_info->gpio_type != GPIO_TYPE_DAVINCI) |
144 | return 0; | |
145 | ||
a994955c MG |
146 | /* |
147 | * The gpio banks conceptually expose a segmented bitmap, | |
474dad54 DB |
148 | * and "ngpio" is one more than the largest zero-based |
149 | * bit index that's valid. | |
150 | */ | |
a994955c MG |
151 | ngpio = soc_info->gpio_num; |
152 | if (ngpio == 0) { | |
474dad54 DB |
153 | pr_err("GPIO setup: how many GPIOs?\n"); |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | if (WARN_ON(DAVINCI_N_GPIO < ngpio)) | |
158 | ngpio = DAVINCI_N_GPIO; | |
159 | ||
b8d44293 CC |
160 | gpio_base = ioremap(soc_info->gpio_base, SZ_4K); |
161 | if (WARN_ON(!gpio_base)) | |
162 | return -ENOMEM; | |
163 | ||
474dad54 | 164 | for (i = 0, base = 0; base < ngpio; i++, base += 32) { |
dce1115b DB |
165 | chips[i].chip.label = "DaVinci"; |
166 | ||
167 | chips[i].chip.direction_input = davinci_direction_in; | |
168 | chips[i].chip.get = davinci_gpio_get; | |
169 | chips[i].chip.direction_output = davinci_direction_out; | |
170 | chips[i].chip.set = davinci_gpio_set; | |
171 | ||
172 | chips[i].chip.base = base; | |
474dad54 | 173 | chips[i].chip.ngpio = ngpio - base; |
dce1115b DB |
174 | if (chips[i].chip.ngpio > 32) |
175 | chips[i].chip.ngpio = 32; | |
176 | ||
b27b6d03 CC |
177 | spin_lock_init(&chips[i].lock); |
178 | ||
c12f415a CC |
179 | regs = gpio2regs(base); |
180 | chips[i].regs = regs; | |
181 | chips[i].set_data = ®s->set_data; | |
182 | chips[i].clr_data = ®s->clr_data; | |
183 | chips[i].in_data = ®s->in_data; | |
dce1115b DB |
184 | |
185 | gpiochip_add(&chips[i].chip); | |
186 | } | |
3d9edf09 | 187 | |
c12f415a CC |
188 | soc_info->gpio_ctlrs = chips; |
189 | soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32); | |
190 | ||
dc756026 | 191 | davinci_gpio_irq_setup(); |
3d9edf09 VB |
192 | return 0; |
193 | } | |
dce1115b | 194 | pure_initcall(davinci_gpio_setup); |
3d9edf09 | 195 | |
dce1115b | 196 | /*--------------------------------------------------------------------------*/ |
3d9edf09 VB |
197 | /* |
198 | * We expect irqs will normally be set up as input pins, but they can also be | |
199 | * used as output pins ... which is convenient for testing. | |
200 | * | |
474dad54 | 201 | * NOTE: The first few GPIOs also have direct INTC hookups in addition |
7a36071e | 202 | * to their GPIOBNK0 irq, with a bit less overhead. |
3d9edf09 | 203 | * |
474dad54 | 204 | * All those INTC hookups (direct, plus several IRQ banks) can also |
3d9edf09 VB |
205 | * serve as EDMA event triggers. |
206 | */ | |
207 | ||
23265442 | 208 | static void gpio_irq_disable(struct irq_data *d) |
3d9edf09 | 209 | { |
23265442 | 210 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 211 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
3d9edf09 VB |
212 | |
213 | __raw_writel(mask, &g->clr_falling); | |
214 | __raw_writel(mask, &g->clr_rising); | |
215 | } | |
216 | ||
23265442 | 217 | static void gpio_irq_enable(struct irq_data *d) |
3d9edf09 | 218 | { |
23265442 | 219 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 220 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
5093aec8 | 221 | unsigned status = irqd_get_trigger_type(d); |
3d9edf09 | 222 | |
df4aab46 DB |
223 | status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; |
224 | if (!status) | |
225 | status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; | |
226 | ||
227 | if (status & IRQ_TYPE_EDGE_FALLING) | |
3d9edf09 | 228 | __raw_writel(mask, &g->set_falling); |
df4aab46 | 229 | if (status & IRQ_TYPE_EDGE_RISING) |
3d9edf09 VB |
230 | __raw_writel(mask, &g->set_rising); |
231 | } | |
232 | ||
23265442 | 233 | static int gpio_irq_type(struct irq_data *d, unsigned trigger) |
3d9edf09 | 234 | { |
23265442 | 235 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 236 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
3d9edf09 VB |
237 | |
238 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) | |
239 | return -EINVAL; | |
240 | ||
3d9edf09 VB |
241 | return 0; |
242 | } | |
243 | ||
244 | static struct irq_chip gpio_irqchip = { | |
245 | .name = "GPIO", | |
23265442 LB |
246 | .irq_enable = gpio_irq_enable, |
247 | .irq_disable = gpio_irq_disable, | |
248 | .irq_set_type = gpio_irq_type, | |
5093aec8 | 249 | .flags = IRQCHIP_SET_TYPE_MASKED, |
3d9edf09 VB |
250 | }; |
251 | ||
252 | static void | |
253 | gpio_irq_handler(unsigned irq, struct irq_desc *desc) | |
254 | { | |
74164016 | 255 | struct davinci_gpio_regs __iomem *g; |
3d9edf09 | 256 | u32 mask = 0xffff; |
f299bb95 | 257 | struct davinci_gpio_controller *d; |
3d9edf09 | 258 | |
f299bb95 IY |
259 | d = (struct davinci_gpio_controller *)irq_desc_get_handler_data(desc); |
260 | g = (struct davinci_gpio_regs __iomem *)d->regs; | |
74164016 | 261 | |
3d9edf09 VB |
262 | /* we only care about one bank */ |
263 | if (irq & 1) | |
264 | mask <<= 16; | |
265 | ||
266 | /* temporarily mask (level sensitive) parent IRQ */ | |
23265442 LB |
267 | desc->irq_data.chip->irq_mask(&desc->irq_data); |
268 | desc->irq_data.chip->irq_ack(&desc->irq_data); | |
3d9edf09 VB |
269 | while (1) { |
270 | u32 status; | |
3d9edf09 VB |
271 | int n; |
272 | int res; | |
273 | ||
274 | /* ack any irqs */ | |
275 | status = __raw_readl(&g->intstat) & mask; | |
276 | if (!status) | |
277 | break; | |
278 | __raw_writel(status, &g->intstat); | |
3d9edf09 VB |
279 | |
280 | /* now demux them to the right lowlevel handler */ | |
f299bb95 IY |
281 | n = d->irq_base; |
282 | if (irq & 1) { | |
283 | n += 16; | |
284 | status >>= 16; | |
285 | } | |
286 | ||
3d9edf09 VB |
287 | while (status) { |
288 | res = ffs(status); | |
289 | n += res; | |
d8aa0251 | 290 | generic_handle_irq(n - 1); |
3d9edf09 VB |
291 | status >>= res; |
292 | } | |
293 | } | |
23265442 | 294 | desc->irq_data.chip->irq_unmask(&desc->irq_data); |
3d9edf09 VB |
295 | /* now it may re-trigger */ |
296 | } | |
297 | ||
7a36071e DB |
298 | static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) |
299 | { | |
99e9e52d | 300 | struct davinci_gpio_controller *d = chip2controller(chip); |
7a36071e DB |
301 | |
302 | if (d->irq_base >= 0) | |
303 | return d->irq_base + offset; | |
304 | else | |
305 | return -ENODEV; | |
306 | } | |
307 | ||
308 | static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) | |
309 | { | |
310 | struct davinci_soc_info *soc_info = &davinci_soc_info; | |
311 | ||
312 | /* NOTE: we assume for now that only irqs in the first gpio_chip | |
313 | * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs). | |
314 | */ | |
315 | if (offset < soc_info->gpio_unbanked) | |
316 | return soc_info->gpio_irq + offset; | |
317 | else | |
318 | return -ENODEV; | |
319 | } | |
320 | ||
23265442 | 321 | static int gpio_irq_type_unbanked(struct irq_data *d, unsigned trigger) |
7a36071e | 322 | { |
23265442 | 323 | struct davinci_gpio_regs __iomem *g = irq2regs(d->irq); |
6845664a | 324 | u32 mask = (u32) irq_data_get_irq_handler_data(d); |
7a36071e DB |
325 | |
326 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) | |
327 | return -EINVAL; | |
328 | ||
329 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING) | |
330 | ? &g->set_falling : &g->clr_falling); | |
331 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING) | |
332 | ? &g->set_rising : &g->clr_rising); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
3d9edf09 | 337 | /* |
474dad54 DB |
338 | * NOTE: for suspend/resume, probably best to make a platform_device with |
339 | * suspend_late/resume_resume calls hooking into results of the set_wake() | |
3d9edf09 VB |
340 | * calls ... so if no gpios are wakeup events the clock can be disabled, |
341 | * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0 | |
474dad54 | 342 | * (dm6446) can be set appropriately for GPIOV33 pins. |
3d9edf09 VB |
343 | */ |
344 | ||
345 | static int __init davinci_gpio_irq_setup(void) | |
346 | { | |
347 | unsigned gpio, irq, bank; | |
348 | struct clk *clk; | |
474dad54 | 349 | u32 binten = 0; |
a994955c MG |
350 | unsigned ngpio, bank_irq; |
351 | struct davinci_soc_info *soc_info = &davinci_soc_info; | |
99e9e52d | 352 | struct davinci_gpio_regs __iomem *g; |
a994955c MG |
353 | |
354 | ngpio = soc_info->gpio_num; | |
474dad54 | 355 | |
a994955c MG |
356 | bank_irq = soc_info->gpio_irq; |
357 | if (bank_irq == 0) { | |
474dad54 DB |
358 | printk(KERN_ERR "Don't know first GPIO bank IRQ.\n"); |
359 | return -EINVAL; | |
360 | } | |
3d9edf09 VB |
361 | |
362 | clk = clk_get(NULL, "gpio"); | |
363 | if (IS_ERR(clk)) { | |
364 | printk(KERN_ERR "Error %ld getting gpio clock?\n", | |
365 | PTR_ERR(clk)); | |
474dad54 | 366 | return PTR_ERR(clk); |
3d9edf09 | 367 | } |
3d9edf09 VB |
368 | clk_enable(clk); |
369 | ||
7a36071e DB |
370 | /* Arrange gpio_to_irq() support, handling either direct IRQs or |
371 | * banked IRQs. Having GPIOs in the first GPIO bank use direct | |
372 | * IRQs, while the others use banked IRQs, would need some setup | |
373 | * tweaks to recognize hardware which can do that. | |
374 | */ | |
375 | for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { | |
376 | chips[bank].chip.to_irq = gpio_to_irq_banked; | |
377 | chips[bank].irq_base = soc_info->gpio_unbanked | |
378 | ? -EINVAL | |
379 | : (soc_info->intc_irq_num + gpio); | |
380 | } | |
381 | ||
382 | /* | |
383 | * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO | |
384 | * controller only handling trigger modes. We currently assume no | |
385 | * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs. | |
386 | */ | |
387 | if (soc_info->gpio_unbanked) { | |
388 | static struct irq_chip gpio_irqchip_unbanked; | |
389 | ||
390 | /* pass "bank 0" GPIO IRQs to AINTC */ | |
391 | chips[0].chip.to_irq = gpio_to_irq_unbanked; | |
392 | binten = BIT(0); | |
393 | ||
394 | /* AINTC handles mask/unmask; GPIO handles triggering */ | |
395 | irq = bank_irq; | |
5093aec8 | 396 | gpio_irqchip_unbanked = *irq_get_chip(irq); |
7a36071e | 397 | gpio_irqchip_unbanked.name = "GPIO-AINTC"; |
23265442 | 398 | gpio_irqchip_unbanked.irq_set_type = gpio_irq_type_unbanked; |
7a36071e DB |
399 | |
400 | /* default trigger: both edges */ | |
99e9e52d | 401 | g = gpio2regs(0); |
7a36071e DB |
402 | __raw_writel(~0, &g->set_falling); |
403 | __raw_writel(~0, &g->set_rising); | |
404 | ||
405 | /* set the direct IRQs up to use that irqchip */ | |
406 | for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) { | |
6845664a TG |
407 | irq_set_chip(irq, &gpio_irqchip_unbanked); |
408 | irq_set_handler_data(irq, (void *)__gpio_mask(gpio)); | |
409 | irq_set_chip_data(irq, (__force void *)g); | |
5093aec8 | 410 | irq_set_status_flags(irq, IRQ_TYPE_EDGE_BOTH); |
7a36071e DB |
411 | } |
412 | ||
413 | goto done; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we | |
418 | * then chain through our own handler. | |
419 | */ | |
474dad54 DB |
420 | for (gpio = 0, irq = gpio_to_irq(0), bank = 0; |
421 | gpio < ngpio; | |
422 | bank++, bank_irq++) { | |
3d9edf09 VB |
423 | unsigned i; |
424 | ||
7a36071e | 425 | /* disabled by default, enabled only as needed */ |
99e9e52d | 426 | g = gpio2regs(gpio); |
3d9edf09 VB |
427 | __raw_writel(~0, &g->clr_falling); |
428 | __raw_writel(~0, &g->clr_rising); | |
429 | ||
430 | /* set up all irqs in this bank */ | |
6845664a | 431 | irq_set_chained_handler(bank_irq, gpio_irq_handler); |
f299bb95 IY |
432 | |
433 | /* | |
434 | * Each chip handles 32 gpios, and each irq bank consists of 16 | |
435 | * gpio irqs. Pass the irq bank's corresponding controller to | |
436 | * the chained irq handler. | |
437 | */ | |
438 | irq_set_handler_data(bank_irq, &chips[gpio / 32]); | |
3d9edf09 | 439 | |
474dad54 | 440 | for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) { |
6845664a TG |
441 | irq_set_chip(irq, &gpio_irqchip); |
442 | irq_set_chip_data(irq, (__force void *)g); | |
443 | irq_set_handler_data(irq, (void *)__gpio_mask(gpio)); | |
444 | irq_set_handler(irq, handle_simple_irq); | |
3d9edf09 VB |
445 | set_irq_flags(irq, IRQF_VALID); |
446 | } | |
474dad54 DB |
447 | |
448 | binten |= BIT(bank); | |
3d9edf09 VB |
449 | } |
450 | ||
7a36071e | 451 | done: |
3d9edf09 VB |
452 | /* BINTEN -- per-bank interrupt enable. genirq would also let these |
453 | * bits be set/cleared dynamically. | |
454 | */ | |
b8d44293 | 455 | __raw_writel(binten, gpio_base + 0x08); |
3d9edf09 VB |
456 | |
457 | printk(KERN_INFO "DaVinci: %d gpio irqs\n", irq - gpio_to_irq(0)); | |
458 | ||
459 | return 0; | |
460 | } |