gpio.c 14 KB

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  1. /*
  2. * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  3. * JZ4740 platform GPIO support
  4. *
  5. * This program is free software; you can redistribute it and/or modify it
  6. * under the terms of the GNU General Public License as published by the
  7. * Free Software Foundation; either version 2 of the License, or (at your
  8. * option) any later version.
  9. *
  10. * You should have received a copy of the GNU General Public License along
  11. * with this program; if not, write to the Free Software Foundation, Inc.,
  12. * 675 Mass Ave, Cambridge, MA 02139, USA.
  13. *
  14. */
  15. #include <linux/kernel.h>
  16. #include <linux/module.h>
  17. #include <linux/init.h>
  18. #include <linux/io.h>
  19. #include <linux/gpio.h>
  20. #include <linux/delay.h>
  21. #include <linux/interrupt.h>
  22. #include <linux/irqchip/ingenic.h>
  23. #include <linux/bitops.h>
  24. #include <linux/debugfs.h>
  25. #include <linux/seq_file.h>
  26. #include <asm/mach-jz4740/base.h>
  27. #include <asm/mach-jz4740/gpio.h>
  28. #define JZ4740_GPIO_BASE_A (32*0)
  29. #define JZ4740_GPIO_BASE_B (32*1)
  30. #define JZ4740_GPIO_BASE_C (32*2)
  31. #define JZ4740_GPIO_BASE_D (32*3)
  32. #define JZ4740_GPIO_NUM_A 32
  33. #define JZ4740_GPIO_NUM_B 32
  34. #define JZ4740_GPIO_NUM_C 31
  35. #define JZ4740_GPIO_NUM_D 32
  36. #define JZ4740_IRQ_GPIO_BASE_A (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_A)
  37. #define JZ4740_IRQ_GPIO_BASE_B (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_B)
  38. #define JZ4740_IRQ_GPIO_BASE_C (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_C)
  39. #define JZ4740_IRQ_GPIO_BASE_D (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_D)
  40. #define JZ_REG_GPIO_PIN 0x00
  41. #define JZ_REG_GPIO_DATA 0x10
  42. #define JZ_REG_GPIO_DATA_SET 0x14
  43. #define JZ_REG_GPIO_DATA_CLEAR 0x18
  44. #define JZ_REG_GPIO_MASK 0x20
  45. #define JZ_REG_GPIO_MASK_SET 0x24
  46. #define JZ_REG_GPIO_MASK_CLEAR 0x28
  47. #define JZ_REG_GPIO_PULL 0x30
  48. #define JZ_REG_GPIO_PULL_SET 0x34
  49. #define JZ_REG_GPIO_PULL_CLEAR 0x38
  50. #define JZ_REG_GPIO_FUNC 0x40
  51. #define JZ_REG_GPIO_FUNC_SET 0x44
  52. #define JZ_REG_GPIO_FUNC_CLEAR 0x48
  53. #define JZ_REG_GPIO_SELECT 0x50
  54. #define JZ_REG_GPIO_SELECT_SET 0x54
  55. #define JZ_REG_GPIO_SELECT_CLEAR 0x58
  56. #define JZ_REG_GPIO_DIRECTION 0x60
  57. #define JZ_REG_GPIO_DIRECTION_SET 0x64
  58. #define JZ_REG_GPIO_DIRECTION_CLEAR 0x68
  59. #define JZ_REG_GPIO_TRIGGER 0x70
  60. #define JZ_REG_GPIO_TRIGGER_SET 0x74
  61. #define JZ_REG_GPIO_TRIGGER_CLEAR 0x78
  62. #define JZ_REG_GPIO_FLAG 0x80
  63. #define JZ_REG_GPIO_FLAG_CLEAR 0x14
  64. #define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f)
  65. #define GPIO_TO_REG(gpio, reg) (gpio_to_jz_gpio_chip(gpio)->base + (reg))
  66. #define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz_gpio_chip(chip)->base + (reg))
  67. struct jz_gpio_chip {
  68. unsigned int irq;
  69. unsigned int irq_base;
  70. uint32_t edge_trigger_both;
  71. void __iomem *base;
  72. struct gpio_chip gpio_chip;
  73. };
  74. static struct jz_gpio_chip jz4740_gpio_chips[];
  75. static inline struct jz_gpio_chip *gpio_to_jz_gpio_chip(unsigned int gpio)
  76. {
  77. return &jz4740_gpio_chips[gpio >> 5];
  78. }
  79. static inline struct jz_gpio_chip *gpio_chip_to_jz_gpio_chip(struct gpio_chip *gpio_chip)
  80. {
  81. return container_of(gpio_chip, struct jz_gpio_chip, gpio_chip);
  82. }
  83. static inline struct jz_gpio_chip *irq_to_jz_gpio_chip(struct irq_data *data)
  84. {
  85. struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
  86. return gc->private;
  87. }
  88. static inline void jz_gpio_write_bit(unsigned int gpio, unsigned int reg)
  89. {
  90. writel(GPIO_TO_BIT(gpio), GPIO_TO_REG(gpio, reg));
  91. }
  92. int jz_gpio_set_function(int gpio, enum jz_gpio_function function)
  93. {
  94. if (function == JZ_GPIO_FUNC_NONE) {
  95. jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_CLEAR);
  96. jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
  97. jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
  98. } else {
  99. jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_SET);
  100. jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
  101. switch (function) {
  102. case JZ_GPIO_FUNC1:
  103. jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
  104. break;
  105. case JZ_GPIO_FUNC3:
  106. jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_SET);
  107. case JZ_GPIO_FUNC2: /* Falltrough */
  108. jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_SET);
  109. break;
  110. default:
  111. BUG();
  112. break;
  113. }
  114. }
  115. return 0;
  116. }
  117. EXPORT_SYMBOL_GPL(jz_gpio_set_function);
  118. int jz_gpio_bulk_request(const struct jz_gpio_bulk_request *request, size_t num)
  119. {
  120. size_t i;
  121. int ret;
  122. for (i = 0; i < num; ++i, ++request) {
  123. ret = gpio_request(request->gpio, request->name);
  124. if (ret)
  125. goto err;
  126. jz_gpio_set_function(request->gpio, request->function);
  127. }
  128. return 0;
  129. err:
  130. for (--request; i > 0; --i, --request) {
  131. gpio_free(request->gpio);
  132. jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
  133. }
  134. return ret;
  135. }
  136. EXPORT_SYMBOL_GPL(jz_gpio_bulk_request);
  137. void jz_gpio_bulk_free(const struct jz_gpio_bulk_request *request, size_t num)
  138. {
  139. size_t i;
  140. for (i = 0; i < num; ++i, ++request) {
  141. gpio_free(request->gpio);
  142. jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
  143. }
  144. }
  145. EXPORT_SYMBOL_GPL(jz_gpio_bulk_free);
  146. void jz_gpio_bulk_suspend(const struct jz_gpio_bulk_request *request, size_t num)
  147. {
  148. size_t i;
  149. for (i = 0; i < num; ++i, ++request) {
  150. jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
  151. jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_DIRECTION_CLEAR);
  152. jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_PULL_SET);
  153. }
  154. }
  155. EXPORT_SYMBOL_GPL(jz_gpio_bulk_suspend);
  156. void jz_gpio_bulk_resume(const struct jz_gpio_bulk_request *request, size_t num)
  157. {
  158. size_t i;
  159. for (i = 0; i < num; ++i, ++request)
  160. jz_gpio_set_function(request->gpio, request->function);
  161. }
  162. EXPORT_SYMBOL_GPL(jz_gpio_bulk_resume);
  163. void jz_gpio_enable_pullup(unsigned gpio)
  164. {
  165. jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_CLEAR);
  166. }
  167. EXPORT_SYMBOL_GPL(jz_gpio_enable_pullup);
  168. void jz_gpio_disable_pullup(unsigned gpio)
  169. {
  170. jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_SET);
  171. }
  172. EXPORT_SYMBOL_GPL(jz_gpio_disable_pullup);
  173. static int jz_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
  174. {
  175. return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio));
  176. }
  177. static void jz_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
  178. {
  179. uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET);
  180. reg += !value;
  181. writel(BIT(gpio), reg);
  182. }
  183. static int jz_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
  184. int value)
  185. {
  186. writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET));
  187. jz_gpio_set_value(chip, gpio, value);
  188. return 0;
  189. }
  190. static int jz_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
  191. {
  192. writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR));
  193. return 0;
  194. }
  195. static int jz_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
  196. {
  197. struct jz_gpio_chip *jz_gpio = gpio_chip_to_jz_gpio_chip(chip);
  198. return jz_gpio->irq_base + gpio;
  199. }
  200. int jz_gpio_port_direction_input(int port, uint32_t mask)
  201. {
  202. writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_CLEAR));
  203. return 0;
  204. }
  205. EXPORT_SYMBOL(jz_gpio_port_direction_input);
  206. int jz_gpio_port_direction_output(int port, uint32_t mask)
  207. {
  208. writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_SET));
  209. return 0;
  210. }
  211. EXPORT_SYMBOL(jz_gpio_port_direction_output);
  212. void jz_gpio_port_set_value(int port, uint32_t value, uint32_t mask)
  213. {
  214. writel(~value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_CLEAR));
  215. writel(value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_SET));
  216. }
  217. EXPORT_SYMBOL(jz_gpio_port_set_value);
  218. uint32_t jz_gpio_port_get_value(int port, uint32_t mask)
  219. {
  220. uint32_t value = readl(GPIO_TO_REG(port, JZ_REG_GPIO_PIN));
  221. return value & mask;
  222. }
  223. EXPORT_SYMBOL(jz_gpio_port_get_value);
  224. #define IRQ_TO_BIT(irq) BIT(irq_to_gpio(irq) & 0x1f)
  225. static void jz_gpio_check_trigger_both(struct jz_gpio_chip *chip, unsigned int irq)
  226. {
  227. uint32_t value;
  228. void __iomem *reg;
  229. uint32_t mask = IRQ_TO_BIT(irq);
  230. if (!(chip->edge_trigger_both & mask))
  231. return;
  232. reg = chip->base;
  233. value = readl(chip->base + JZ_REG_GPIO_PIN);
  234. if (value & mask)
  235. reg += JZ_REG_GPIO_DIRECTION_CLEAR;
  236. else
  237. reg += JZ_REG_GPIO_DIRECTION_SET;
  238. writel(mask, reg);
  239. }
  240. static void jz_gpio_irq_demux_handler(struct irq_desc *desc)
  241. {
  242. uint32_t flag;
  243. unsigned int gpio_irq;
  244. struct jz_gpio_chip *chip = irq_desc_get_handler_data(desc);
  245. flag = readl(chip->base + JZ_REG_GPIO_FLAG);
  246. if (!flag)
  247. return;
  248. gpio_irq = chip->irq_base + __fls(flag);
  249. jz_gpio_check_trigger_both(chip, gpio_irq);
  250. generic_handle_irq(gpio_irq);
  251. };
  252. static inline void jz_gpio_set_irq_bit(struct irq_data *data, unsigned int reg)
  253. {
  254. struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
  255. writel(IRQ_TO_BIT(data->irq), chip->base + reg);
  256. }
  257. static void jz_gpio_irq_unmask(struct irq_data *data)
  258. {
  259. struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
  260. jz_gpio_check_trigger_both(chip, data->irq);
  261. irq_gc_unmask_enable_reg(data);
  262. };
  263. /* TODO: Check if function is gpio */
  264. static unsigned int jz_gpio_irq_startup(struct irq_data *data)
  265. {
  266. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_SET);
  267. jz_gpio_irq_unmask(data);
  268. return 0;
  269. }
  270. static void jz_gpio_irq_shutdown(struct irq_data *data)
  271. {
  272. irq_gc_mask_disable_reg(data);
  273. /* Set direction to input */
  274. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
  275. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_CLEAR);
  276. }
  277. static int jz_gpio_irq_set_type(struct irq_data *data, unsigned int flow_type)
  278. {
  279. struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
  280. unsigned int irq = data->irq;
  281. if (flow_type == IRQ_TYPE_EDGE_BOTH) {
  282. uint32_t value = readl(chip->base + JZ_REG_GPIO_PIN);
  283. if (value & IRQ_TO_BIT(irq))
  284. flow_type = IRQ_TYPE_EDGE_FALLING;
  285. else
  286. flow_type = IRQ_TYPE_EDGE_RISING;
  287. chip->edge_trigger_both |= IRQ_TO_BIT(irq);
  288. } else {
  289. chip->edge_trigger_both &= ~IRQ_TO_BIT(irq);
  290. }
  291. switch (flow_type) {
  292. case IRQ_TYPE_EDGE_RISING:
  293. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
  294. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
  295. break;
  296. case IRQ_TYPE_EDGE_FALLING:
  297. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
  298. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
  299. break;
  300. case IRQ_TYPE_LEVEL_HIGH:
  301. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
  302. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
  303. break;
  304. case IRQ_TYPE_LEVEL_LOW:
  305. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
  306. jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
  307. break;
  308. default:
  309. return -EINVAL;
  310. }
  311. return 0;
  312. }
  313. static int jz_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
  314. {
  315. struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
  316. irq_gc_set_wake(data, on);
  317. irq_set_irq_wake(chip->irq, on);
  318. return 0;
  319. }
  320. #define JZ4740_GPIO_CHIP(_bank) { \
  321. .irq_base = JZ4740_IRQ_GPIO_BASE_ ## _bank, \
  322. .gpio_chip = { \
  323. .label = "Bank " # _bank, \
  324. .owner = THIS_MODULE, \
  325. .set = jz_gpio_set_value, \
  326. .get = jz_gpio_get_value, \
  327. .direction_output = jz_gpio_direction_output, \
  328. .direction_input = jz_gpio_direction_input, \
  329. .to_irq = jz_gpio_to_irq, \
  330. .base = JZ4740_GPIO_BASE_ ## _bank, \
  331. .ngpio = JZ4740_GPIO_NUM_ ## _bank, \
  332. }, \
  333. }
  334. static struct jz_gpio_chip jz4740_gpio_chips[] = {
  335. JZ4740_GPIO_CHIP(A),
  336. JZ4740_GPIO_CHIP(B),
  337. JZ4740_GPIO_CHIP(C),
  338. JZ4740_GPIO_CHIP(D),
  339. };
  340. static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
  341. {
  342. struct irq_chip_generic *gc;
  343. struct irq_chip_type *ct;
  344. chip->base = ioremap(JZ4740_GPIO_BASE_ADDR + (id * 0x100), 0x100);
  345. chip->irq = JZ4740_IRQ_INTC_GPIO(id);
  346. irq_set_chained_handler_and_data(chip->irq,
  347. jz_gpio_irq_demux_handler, chip);
  348. gc = irq_alloc_generic_chip(chip->gpio_chip.label, 1, chip->irq_base,
  349. chip->base, handle_level_irq);
  350. gc->wake_enabled = IRQ_MSK(chip->gpio_chip.ngpio);
  351. gc->private = chip;
  352. ct = gc->chip_types;
  353. ct->regs.enable = JZ_REG_GPIO_MASK_CLEAR;
  354. ct->regs.disable = JZ_REG_GPIO_MASK_SET;
  355. ct->regs.ack = JZ_REG_GPIO_FLAG_CLEAR;
  356. ct->chip.name = "GPIO";
  357. ct->chip.irq_mask = irq_gc_mask_disable_reg;
  358. ct->chip.irq_unmask = jz_gpio_irq_unmask;
  359. ct->chip.irq_ack = irq_gc_ack_set_bit;
  360. ct->chip.irq_suspend = ingenic_intc_irq_suspend;
  361. ct->chip.irq_resume = ingenic_intc_irq_resume;
  362. ct->chip.irq_startup = jz_gpio_irq_startup;
  363. ct->chip.irq_shutdown = jz_gpio_irq_shutdown;
  364. ct->chip.irq_set_type = jz_gpio_irq_set_type;
  365. ct->chip.irq_set_wake = jz_gpio_irq_set_wake;
  366. ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
  367. irq_setup_generic_chip(gc, IRQ_MSK(chip->gpio_chip.ngpio),
  368. IRQ_GC_INIT_NESTED_LOCK, 0, IRQ_NOPROBE | IRQ_LEVEL);
  369. gpiochip_add(&chip->gpio_chip);
  370. }
  371. static int __init jz4740_gpio_init(void)
  372. {
  373. unsigned int i;
  374. for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
  375. jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);
  376. printk(KERN_INFO "JZ4740 GPIO initialized\n");
  377. return 0;
  378. }
  379. arch_initcall(jz4740_gpio_init);
  380. #ifdef CONFIG_DEBUG_FS
  381. static inline void gpio_seq_reg(struct seq_file *s, struct jz_gpio_chip *chip,
  382. const char *name, unsigned int reg)
  383. {
  384. seq_printf(s, "\t%s: %08x\n", name, readl(chip->base + reg));
  385. }
  386. static int gpio_regs_show(struct seq_file *s, void *unused)
  387. {
  388. struct jz_gpio_chip *chip = jz4740_gpio_chips;
  389. int i;
  390. for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i, ++chip) {
  391. seq_printf(s, "==GPIO %d==\n", i);
  392. gpio_seq_reg(s, chip, "Pin", JZ_REG_GPIO_PIN);
  393. gpio_seq_reg(s, chip, "Data", JZ_REG_GPIO_DATA);
  394. gpio_seq_reg(s, chip, "Mask", JZ_REG_GPIO_MASK);
  395. gpio_seq_reg(s, chip, "Pull", JZ_REG_GPIO_PULL);
  396. gpio_seq_reg(s, chip, "Func", JZ_REG_GPIO_FUNC);
  397. gpio_seq_reg(s, chip, "Select", JZ_REG_GPIO_SELECT);
  398. gpio_seq_reg(s, chip, "Direction", JZ_REG_GPIO_DIRECTION);
  399. gpio_seq_reg(s, chip, "Trigger", JZ_REG_GPIO_TRIGGER);
  400. gpio_seq_reg(s, chip, "Flag", JZ_REG_GPIO_FLAG);
  401. }
  402. return 0;
  403. }
  404. static int gpio_regs_open(struct inode *inode, struct file *file)
  405. {
  406. return single_open(file, gpio_regs_show, NULL);
  407. }
  408. static const struct file_operations gpio_regs_operations = {
  409. .open = gpio_regs_open,
  410. .read = seq_read,
  411. .llseek = seq_lseek,
  412. .release = single_release,
  413. };
  414. static int __init gpio_debugfs_init(void)
  415. {
  416. (void) debugfs_create_file("jz_regs_gpio", S_IFREG | S_IRUGO,
  417. NULL, NULL, &gpio_regs_operations);
  418. return 0;
  419. }
  420. subsys_initcall(gpio_debugfs_init);
  421. #endif