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a07e103e MD |
1 | /* |
2 | * Emma Mobile GPIO Support - GIO | |
3 | * | |
4 | * Copyright (C) 2012 Magnus Damm | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/irq.h> | |
27 | #include <linux/irqdomain.h> | |
28 | #include <linux/bitops.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/gpio.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/platform_data/gpio-em.h> | |
34 | ||
35 | struct em_gio_priv { | |
36 | void __iomem *base0; | |
37 | void __iomem *base1; | |
a07e103e MD |
38 | spinlock_t sense_lock; |
39 | struct platform_device *pdev; | |
40 | struct gpio_chip gpio_chip; | |
41 | struct irq_chip irq_chip; | |
42 | struct irq_domain *irq_domain; | |
43 | }; | |
44 | ||
45 | #define GIO_E1 0x00 | |
46 | #define GIO_E0 0x04 | |
47 | #define GIO_EM 0x04 | |
48 | #define GIO_OL 0x08 | |
49 | #define GIO_OH 0x0c | |
50 | #define GIO_I 0x10 | |
51 | #define GIO_IIA 0x14 | |
52 | #define GIO_IEN 0x18 | |
53 | #define GIO_IDS 0x1c | |
54 | #define GIO_IIM 0x1c | |
55 | #define GIO_RAW 0x20 | |
56 | #define GIO_MST 0x24 | |
57 | #define GIO_IIR 0x28 | |
58 | ||
59 | #define GIO_IDT0 0x40 | |
60 | #define GIO_IDT1 0x44 | |
61 | #define GIO_IDT2 0x48 | |
62 | #define GIO_IDT3 0x4c | |
63 | #define GIO_RAWBL 0x50 | |
64 | #define GIO_RAWBH 0x54 | |
65 | #define GIO_IRBL 0x58 | |
66 | #define GIO_IRBH 0x5c | |
67 | ||
68 | #define GIO_IDT(n) (GIO_IDT0 + ((n) * 4)) | |
69 | ||
70 | static inline unsigned long em_gio_read(struct em_gio_priv *p, int offs) | |
71 | { | |
72 | if (offs < GIO_IDT0) | |
73 | return ioread32(p->base0 + offs); | |
74 | else | |
75 | return ioread32(p->base1 + (offs - GIO_IDT0)); | |
76 | } | |
77 | ||
78 | static inline void em_gio_write(struct em_gio_priv *p, int offs, | |
79 | unsigned long value) | |
80 | { | |
81 | if (offs < GIO_IDT0) | |
82 | iowrite32(value, p->base0 + offs); | |
83 | else | |
84 | iowrite32(value, p->base1 + (offs - GIO_IDT0)); | |
85 | } | |
86 | ||
a07e103e MD |
87 | static void em_gio_irq_disable(struct irq_data *d) |
88 | { | |
a9f77c93 | 89 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
90 | |
91 | em_gio_write(p, GIO_IDS, BIT(irqd_to_hwirq(d))); | |
92 | } | |
93 | ||
94 | static void em_gio_irq_enable(struct irq_data *d) | |
95 | { | |
a9f77c93 | 96 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
97 | |
98 | em_gio_write(p, GIO_IEN, BIT(irqd_to_hwirq(d))); | |
99 | } | |
100 | ||
101 | #define GIO_ASYNC(x) (x + 8) | |
102 | ||
103 | static unsigned char em_gio_sense_table[IRQ_TYPE_SENSE_MASK + 1] = { | |
104 | [IRQ_TYPE_EDGE_RISING] = GIO_ASYNC(0x00), | |
105 | [IRQ_TYPE_EDGE_FALLING] = GIO_ASYNC(0x01), | |
106 | [IRQ_TYPE_LEVEL_HIGH] = GIO_ASYNC(0x02), | |
107 | [IRQ_TYPE_LEVEL_LOW] = GIO_ASYNC(0x03), | |
108 | [IRQ_TYPE_EDGE_BOTH] = GIO_ASYNC(0x04), | |
109 | }; | |
110 | ||
111 | static int em_gio_irq_set_type(struct irq_data *d, unsigned int type) | |
112 | { | |
113 | unsigned char value = em_gio_sense_table[type & IRQ_TYPE_SENSE_MASK]; | |
a9f77c93 | 114 | struct em_gio_priv *p = irq_data_get_irq_chip_data(d); |
a07e103e MD |
115 | unsigned int reg, offset, shift; |
116 | unsigned long flags; | |
117 | unsigned long tmp; | |
118 | ||
119 | if (!value) | |
120 | return -EINVAL; | |
121 | ||
122 | offset = irqd_to_hwirq(d); | |
123 | ||
124 | pr_debug("gio: sense irq = %d, mode = %d\n", offset, value); | |
125 | ||
126 | /* 8 x 4 bit fields in 4 IDT registers */ | |
127 | reg = GIO_IDT(offset >> 3); | |
128 | shift = (offset & 0x07) << 4; | |
129 | ||
130 | spin_lock_irqsave(&p->sense_lock, flags); | |
131 | ||
132 | /* disable the interrupt in IIA */ | |
133 | tmp = em_gio_read(p, GIO_IIA); | |
134 | tmp &= ~BIT(offset); | |
135 | em_gio_write(p, GIO_IIA, tmp); | |
136 | ||
137 | /* change the sense setting in IDT */ | |
138 | tmp = em_gio_read(p, reg); | |
139 | tmp &= ~(0xf << shift); | |
140 | tmp |= value << shift; | |
141 | em_gio_write(p, reg, tmp); | |
142 | ||
143 | /* clear pending interrupts */ | |
144 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
145 | ||
146 | /* enable the interrupt in IIA */ | |
147 | tmp = em_gio_read(p, GIO_IIA); | |
148 | tmp |= BIT(offset); | |
149 | em_gio_write(p, GIO_IIA, tmp); | |
150 | ||
151 | spin_unlock_irqrestore(&p->sense_lock, flags); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static irqreturn_t em_gio_irq_handler(int irq, void *dev_id) | |
157 | { | |
158 | struct em_gio_priv *p = dev_id; | |
159 | unsigned long pending; | |
160 | unsigned int offset, irqs_handled = 0; | |
161 | ||
162 | while ((pending = em_gio_read(p, GIO_MST))) { | |
163 | offset = __ffs(pending); | |
164 | em_gio_write(p, GIO_IIR, BIT(offset)); | |
165 | generic_handle_irq(irq_find_mapping(p->irq_domain, offset)); | |
166 | irqs_handled++; | |
167 | } | |
168 | ||
169 | return irqs_handled ? IRQ_HANDLED : IRQ_NONE; | |
170 | } | |
171 | ||
172 | static inline struct em_gio_priv *gpio_to_priv(struct gpio_chip *chip) | |
173 | { | |
174 | return container_of(chip, struct em_gio_priv, gpio_chip); | |
175 | } | |
176 | ||
177 | static int em_gio_direction_input(struct gpio_chip *chip, unsigned offset) | |
178 | { | |
179 | em_gio_write(gpio_to_priv(chip), GIO_E0, BIT(offset)); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int em_gio_get(struct gpio_chip *chip, unsigned offset) | |
184 | { | |
185 | return (int)(em_gio_read(gpio_to_priv(chip), GIO_I) & BIT(offset)); | |
186 | } | |
187 | ||
188 | static void __em_gio_set(struct gpio_chip *chip, unsigned int reg, | |
189 | unsigned shift, int value) | |
190 | { | |
191 | /* upper 16 bits contains mask and lower 16 actual value */ | |
192 | em_gio_write(gpio_to_priv(chip), reg, | |
193 | (1 << (shift + 16)) | (value << shift)); | |
194 | } | |
195 | ||
196 | static void em_gio_set(struct gpio_chip *chip, unsigned offset, int value) | |
197 | { | |
198 | /* output is split into two registers */ | |
199 | if (offset < 16) | |
200 | __em_gio_set(chip, GIO_OL, offset, value); | |
201 | else | |
202 | __em_gio_set(chip, GIO_OH, offset - 16, value); | |
203 | } | |
204 | ||
205 | static int em_gio_direction_output(struct gpio_chip *chip, unsigned offset, | |
206 | int value) | |
207 | { | |
208 | /* write GPIO value to output before selecting output mode of pin */ | |
209 | em_gio_set(chip, offset, value); | |
210 | em_gio_write(gpio_to_priv(chip), GIO_E1, BIT(offset)); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int em_gio_to_irq(struct gpio_chip *chip, unsigned offset) | |
215 | { | |
7385500a | 216 | return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset); |
a07e103e MD |
217 | } |
218 | ||
219 | static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq, | |
220 | irq_hw_number_t hw) | |
221 | { | |
222 | struct em_gio_priv *p = h->host_data; | |
223 | ||
224 | pr_debug("gio: map hw irq = %d, virq = %d\n", (int)hw, virq); | |
225 | ||
226 | irq_set_chip_data(virq, h->host_data); | |
227 | irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq); | |
228 | set_irq_flags(virq, IRQF_VALID); /* kill me now */ | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static struct irq_domain_ops em_gio_irq_domain_ops = { | |
233 | .map = em_gio_irq_domain_map, | |
753c5983 | 234 | .xlate = irq_domain_xlate_twocell, |
a07e103e MD |
235 | }; |
236 | ||
3836309d | 237 | static int em_gio_probe(struct platform_device *pdev) |
a07e103e | 238 | { |
753c5983 | 239 | struct gpio_em_config pdata_dt; |
a07e103e MD |
240 | struct gpio_em_config *pdata = pdev->dev.platform_data; |
241 | struct em_gio_priv *p; | |
242 | struct resource *io[2], *irq[2]; | |
243 | struct gpio_chip *gpio_chip; | |
244 | struct irq_chip *irq_chip; | |
245 | const char *name = dev_name(&pdev->dev); | |
246 | int ret; | |
247 | ||
1cfe6f8c | 248 | p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL); |
a07e103e MD |
249 | if (!p) { |
250 | dev_err(&pdev->dev, "failed to allocate driver data\n"); | |
251 | ret = -ENOMEM; | |
252 | goto err0; | |
253 | } | |
254 | ||
255 | p->pdev = pdev; | |
256 | platform_set_drvdata(pdev, p); | |
257 | spin_lock_init(&p->sense_lock); | |
258 | ||
259 | io[0] = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
260 | io[1] = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
261 | irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
262 | irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1); | |
263 | ||
753c5983 MD |
264 | if (!io[0] || !io[1] || !irq[0] || !irq[1]) { |
265 | dev_err(&pdev->dev, "missing IRQ or IOMEM\n"); | |
a07e103e | 266 | ret = -EINVAL; |
1cfe6f8c | 267 | goto err0; |
a07e103e MD |
268 | } |
269 | ||
1cfe6f8c MD |
270 | p->base0 = devm_ioremap_nocache(&pdev->dev, io[0]->start, |
271 | resource_size(io[0])); | |
a07e103e MD |
272 | if (!p->base0) { |
273 | dev_err(&pdev->dev, "failed to remap low I/O memory\n"); | |
274 | ret = -ENXIO; | |
1cfe6f8c | 275 | goto err0; |
a07e103e MD |
276 | } |
277 | ||
1cfe6f8c MD |
278 | p->base1 = devm_ioremap_nocache(&pdev->dev, io[1]->start, |
279 | resource_size(io[1])); | |
a07e103e MD |
280 | if (!p->base1) { |
281 | dev_err(&pdev->dev, "failed to remap high I/O memory\n"); | |
282 | ret = -ENXIO; | |
1cfe6f8c | 283 | goto err0; |
a07e103e MD |
284 | } |
285 | ||
753c5983 MD |
286 | if (!pdata) { |
287 | memset(&pdata_dt, 0, sizeof(pdata_dt)); | |
288 | pdata = &pdata_dt; | |
289 | ||
290 | if (of_property_read_u32(pdev->dev.of_node, "ngpios", | |
291 | &pdata->number_of_pins)) { | |
292 | dev_err(&pdev->dev, "Missing ngpios OF property\n"); | |
293 | ret = -EINVAL; | |
1cfe6f8c | 294 | goto err0; |
753c5983 MD |
295 | } |
296 | ||
297 | ret = of_alias_get_id(pdev->dev.of_node, "gpio"); | |
298 | if (ret < 0) { | |
299 | dev_err(&pdev->dev, "Couldn't get OF id\n"); | |
1cfe6f8c | 300 | goto err0; |
753c5983 MD |
301 | } |
302 | pdata->gpio_base = ret * 32; /* 32 GPIOs per instance */ | |
303 | } | |
304 | ||
a07e103e MD |
305 | gpio_chip = &p->gpio_chip; |
306 | gpio_chip->direction_input = em_gio_direction_input; | |
307 | gpio_chip->get = em_gio_get; | |
308 | gpio_chip->direction_output = em_gio_direction_output; | |
309 | gpio_chip->set = em_gio_set; | |
310 | gpio_chip->to_irq = em_gio_to_irq; | |
311 | gpio_chip->label = name; | |
312 | gpio_chip->owner = THIS_MODULE; | |
313 | gpio_chip->base = pdata->gpio_base; | |
314 | gpio_chip->ngpio = pdata->number_of_pins; | |
315 | ||
316 | irq_chip = &p->irq_chip; | |
317 | irq_chip->name = name; | |
318 | irq_chip->irq_mask = em_gio_irq_disable; | |
319 | irq_chip->irq_unmask = em_gio_irq_enable; | |
320 | irq_chip->irq_enable = em_gio_irq_enable; | |
321 | irq_chip->irq_disable = em_gio_irq_disable; | |
322 | irq_chip->irq_set_type = em_gio_irq_set_type; | |
323 | irq_chip->flags = IRQCHIP_SKIP_SET_WAKE; | |
324 | ||
c7886b18 | 325 | p->irq_domain = irq_domain_add_simple(pdev->dev.of_node, |
7385500a | 326 | pdata->number_of_pins, |
c7886b18 | 327 | pdata->irq_base, |
7385500a | 328 | &em_gio_irq_domain_ops, p); |
16310819 AL |
329 | if (!p->irq_domain) { |
330 | ret = -ENXIO; | |
a07e103e | 331 | dev_err(&pdev->dev, "cannot initialize irq domain\n"); |
1cfe6f8c | 332 | goto err0; |
a07e103e MD |
333 | } |
334 | ||
1cfe6f8c MD |
335 | if (devm_request_irq(&pdev->dev, irq[0]->start, |
336 | em_gio_irq_handler, 0, name, p)) { | |
a07e103e MD |
337 | dev_err(&pdev->dev, "failed to request low IRQ\n"); |
338 | ret = -ENOENT; | |
1cfe6f8c | 339 | goto err1; |
a07e103e MD |
340 | } |
341 | ||
1cfe6f8c MD |
342 | if (devm_request_irq(&pdev->dev, irq[1]->start, |
343 | em_gio_irq_handler, 0, name, p)) { | |
a07e103e MD |
344 | dev_err(&pdev->dev, "failed to request high IRQ\n"); |
345 | ret = -ENOENT; | |
1cfe6f8c | 346 | goto err1; |
a07e103e MD |
347 | } |
348 | ||
349 | ret = gpiochip_add(gpio_chip); | |
350 | if (ret) { | |
351 | dev_err(&pdev->dev, "failed to add GPIO controller\n"); | |
1cfe6f8c | 352 | goto err1; |
a07e103e MD |
353 | } |
354 | return 0; | |
355 | ||
a07e103e | 356 | err1: |
1cfe6f8c | 357 | irq_domain_remove(p->irq_domain); |
a07e103e MD |
358 | err0: |
359 | return ret; | |
360 | } | |
361 | ||
206210ce | 362 | static int em_gio_remove(struct platform_device *pdev) |
a07e103e MD |
363 | { |
364 | struct em_gio_priv *p = platform_get_drvdata(pdev); | |
a07e103e MD |
365 | int ret; |
366 | ||
367 | ret = gpiochip_remove(&p->gpio_chip); | |
368 | if (ret) | |
369 | return ret; | |
370 | ||
16310819 | 371 | irq_domain_remove(p->irq_domain); |
a07e103e MD |
372 | return 0; |
373 | } | |
374 | ||
753c5983 MD |
375 | static const struct of_device_id em_gio_dt_ids[] = { |
376 | { .compatible = "renesas,em-gio", }, | |
377 | {}, | |
378 | }; | |
379 | MODULE_DEVICE_TABLE(of, em_gio_dt_ids); | |
380 | ||
a07e103e MD |
381 | static struct platform_driver em_gio_device_driver = { |
382 | .probe = em_gio_probe, | |
8283c4ff | 383 | .remove = em_gio_remove, |
a07e103e MD |
384 | .driver = { |
385 | .name = "em_gio", | |
753c5983 MD |
386 | .of_match_table = em_gio_dt_ids, |
387 | .owner = THIS_MODULE, | |
a07e103e MD |
388 | } |
389 | }; | |
390 | ||
753c5983 MD |
391 | static int __init em_gio_init(void) |
392 | { | |
393 | return platform_driver_register(&em_gio_device_driver); | |
394 | } | |
395 | postcore_initcall(em_gio_init); | |
396 | ||
397 | static void __exit em_gio_exit(void) | |
398 | { | |
399 | platform_driver_unregister(&em_gio_device_driver); | |
400 | } | |
401 | module_exit(em_gio_exit); | |
a07e103e MD |
402 | |
403 | MODULE_AUTHOR("Magnus Damm"); | |
404 | MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver"); | |
405 | MODULE_LICENSE("GPL v2"); |