linux/arch/mips/jz4740/gpio.c
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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
  16#include <linux/kernel.h>
  17#include <linux/module.h>
  18#include <linux/init.h>
  19
  20#include <linux/io.h>
  21#include <linux/gpio.h>
  22#include <linux/delay.h>
  23#include <linux/interrupt.h>
  24#include <linux/bitops.h>
  25
  26#include <linux/debugfs.h>
  27#include <linux/seq_file.h>
  28
  29#include <asm/mach-jz4740/base.h>
  30
  31#include "irq.h"
  32
  33#define JZ4740_GPIO_BASE_A (32*0)
  34#define JZ4740_GPIO_BASE_B (32*1)
  35#define JZ4740_GPIO_BASE_C (32*2)
  36#define JZ4740_GPIO_BASE_D (32*3)
  37
  38#define JZ4740_GPIO_NUM_A 32
  39#define JZ4740_GPIO_NUM_B 32
  40#define JZ4740_GPIO_NUM_C 31
  41#define JZ4740_GPIO_NUM_D 32
  42
  43#define JZ4740_IRQ_GPIO_BASE_A (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_A)
  44#define JZ4740_IRQ_GPIO_BASE_B (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_B)
  45#define JZ4740_IRQ_GPIO_BASE_C (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_C)
  46#define JZ4740_IRQ_GPIO_BASE_D (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_D)
  47
  48#define JZ_REG_GPIO_PIN                 0x00
  49#define JZ_REG_GPIO_DATA                0x10
  50#define JZ_REG_GPIO_DATA_SET            0x14
  51#define JZ_REG_GPIO_DATA_CLEAR          0x18
  52#define JZ_REG_GPIO_MASK                0x20
  53#define JZ_REG_GPIO_MASK_SET            0x24
  54#define JZ_REG_GPIO_MASK_CLEAR          0x28
  55#define JZ_REG_GPIO_PULL                0x30
  56#define JZ_REG_GPIO_PULL_SET            0x34
  57#define JZ_REG_GPIO_PULL_CLEAR          0x38
  58#define JZ_REG_GPIO_FUNC                0x40
  59#define JZ_REG_GPIO_FUNC_SET            0x44
  60#define JZ_REG_GPIO_FUNC_CLEAR          0x48
  61#define JZ_REG_GPIO_SELECT              0x50
  62#define JZ_REG_GPIO_SELECT_SET          0x54
  63#define JZ_REG_GPIO_SELECT_CLEAR        0x58
  64#define JZ_REG_GPIO_DIRECTION           0x60
  65#define JZ_REG_GPIO_DIRECTION_SET       0x64
  66#define JZ_REG_GPIO_DIRECTION_CLEAR     0x68
  67#define JZ_REG_GPIO_TRIGGER             0x70
  68#define JZ_REG_GPIO_TRIGGER_SET         0x74
  69#define JZ_REG_GPIO_TRIGGER_CLEAR       0x78
  70#define JZ_REG_GPIO_FLAG                0x80
  71#define JZ_REG_GPIO_FLAG_CLEAR          0x14
  72
  73#define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f)
  74#define GPIO_TO_REG(gpio, reg) (gpio_to_jz_gpio_chip(gpio)->base + (reg))
  75#define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz_gpio_chip(chip)->base + (reg))
  76
  77struct jz_gpio_chip {
  78        unsigned int irq;
  79        unsigned int irq_base;
  80        uint32_t edge_trigger_both;
  81
  82        void __iomem *base;
  83
  84        struct gpio_chip gpio_chip;
  85};
  86
  87static struct jz_gpio_chip jz4740_gpio_chips[];
  88
  89static inline struct jz_gpio_chip *gpio_to_jz_gpio_chip(unsigned int gpio)
  90{
  91        return &jz4740_gpio_chips[gpio >> 5];
  92}
  93
  94static inline struct jz_gpio_chip *gpio_chip_to_jz_gpio_chip(struct gpio_chip *gpio_chip)
  95{
  96        return container_of(gpio_chip, struct jz_gpio_chip, gpio_chip);
  97}
  98
  99static inline struct jz_gpio_chip *irq_to_jz_gpio_chip(struct irq_data *data)
 100{
 101        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
 102        return gc->private;
 103}
 104
 105static inline void jz_gpio_write_bit(unsigned int gpio, unsigned int reg)
 106{
 107        writel(GPIO_TO_BIT(gpio), GPIO_TO_REG(gpio, reg));
 108}
 109
 110int jz_gpio_set_function(int gpio, enum jz_gpio_function function)
 111{
 112        if (function == JZ_GPIO_FUNC_NONE) {
 113                jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_CLEAR);
 114                jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
 115                jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
 116        } else {
 117                jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_SET);
 118                jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
 119                switch (function) {
 120                case JZ_GPIO_FUNC1:
 121                        jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
 122                        break;
 123                case JZ_GPIO_FUNC3:
 124                        jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_SET);
 125                case JZ_GPIO_FUNC2: /* Falltrough */
 126                        jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_SET);
 127                        break;
 128                default:
 129                        BUG();
 130                        break;
 131                }
 132        }
 133
 134        return 0;
 135}
 136EXPORT_SYMBOL_GPL(jz_gpio_set_function);
 137
 138int jz_gpio_bulk_request(const struct jz_gpio_bulk_request *request, size_t num)
 139{
 140        size_t i;
 141        int ret;
 142
 143        for (i = 0; i < num; ++i, ++request) {
 144                ret = gpio_request(request->gpio, request->name);
 145                if (ret)
 146                        goto err;
 147                jz_gpio_set_function(request->gpio, request->function);
 148        }
 149
 150        return 0;
 151
 152err:
 153        for (--request; i > 0; --i, --request) {
 154                gpio_free(request->gpio);
 155                jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
 156        }
 157
 158        return ret;
 159}
 160EXPORT_SYMBOL_GPL(jz_gpio_bulk_request);
 161
 162void jz_gpio_bulk_free(const struct jz_gpio_bulk_request *request, size_t num)
 163{
 164        size_t i;
 165
 166        for (i = 0; i < num; ++i, ++request) {
 167                gpio_free(request->gpio);
 168                jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
 169        }
 170
 171}
 172EXPORT_SYMBOL_GPL(jz_gpio_bulk_free);
 173
 174void jz_gpio_bulk_suspend(const struct jz_gpio_bulk_request *request, size_t num)
 175{
 176        size_t i;
 177
 178        for (i = 0; i < num; ++i, ++request) {
 179                jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
 180                jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_DIRECTION_CLEAR);
 181                jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_PULL_SET);
 182        }
 183}
 184EXPORT_SYMBOL_GPL(jz_gpio_bulk_suspend);
 185
 186void jz_gpio_bulk_resume(const struct jz_gpio_bulk_request *request, size_t num)
 187{
 188        size_t i;
 189
 190        for (i = 0; i < num; ++i, ++request)
 191                jz_gpio_set_function(request->gpio, request->function);
 192}
 193EXPORT_SYMBOL_GPL(jz_gpio_bulk_resume);
 194
 195void jz_gpio_enable_pullup(unsigned gpio)
 196{
 197        jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_CLEAR);
 198}
 199EXPORT_SYMBOL_GPL(jz_gpio_enable_pullup);
 200
 201void jz_gpio_disable_pullup(unsigned gpio)
 202{
 203        jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_SET);
 204}
 205EXPORT_SYMBOL_GPL(jz_gpio_disable_pullup);
 206
 207static int jz_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
 208{
 209        return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio));
 210}
 211
 212static void jz_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
 213{
 214        uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET);
 215        reg += !value;
 216        writel(BIT(gpio), reg);
 217}
 218
 219static int jz_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
 220        int value)
 221{
 222        writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET));
 223        jz_gpio_set_value(chip, gpio, value);
 224
 225        return 0;
 226}
 227
 228static int jz_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 229{
 230        writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR));
 231
 232        return 0;
 233}
 234
 235int jz_gpio_port_direction_input(int port, uint32_t mask)
 236{
 237        writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_CLEAR));
 238
 239        return 0;
 240}
 241EXPORT_SYMBOL(jz_gpio_port_direction_input);
 242
 243int jz_gpio_port_direction_output(int port, uint32_t mask)
 244{
 245        writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_SET));
 246
 247        return 0;
 248}
 249EXPORT_SYMBOL(jz_gpio_port_direction_output);
 250
 251void jz_gpio_port_set_value(int port, uint32_t value, uint32_t mask)
 252{
 253        writel(~value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_CLEAR));
 254        writel(value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_SET));
 255}
 256EXPORT_SYMBOL(jz_gpio_port_set_value);
 257
 258uint32_t jz_gpio_port_get_value(int port, uint32_t mask)
 259{
 260        uint32_t value = readl(GPIO_TO_REG(port, JZ_REG_GPIO_PIN));
 261
 262        return value & mask;
 263}
 264EXPORT_SYMBOL(jz_gpio_port_get_value);
 265
 266int gpio_to_irq(unsigned gpio)
 267{
 268        return JZ4740_IRQ_GPIO(0) + gpio;
 269}
 270EXPORT_SYMBOL_GPL(gpio_to_irq);
 271
 272int irq_to_gpio(unsigned irq)
 273{
 274        return irq - JZ4740_IRQ_GPIO(0);
 275}
 276EXPORT_SYMBOL_GPL(irq_to_gpio);
 277
 278#define IRQ_TO_BIT(irq) BIT(irq_to_gpio(irq) & 0x1f)
 279
 280static void jz_gpio_check_trigger_both(struct jz_gpio_chip *chip, unsigned int irq)
 281{
 282        uint32_t value;
 283        void __iomem *reg;
 284        uint32_t mask = IRQ_TO_BIT(irq);
 285
 286        if (!(chip->edge_trigger_both & mask))
 287                return;
 288
 289        reg = chip->base;
 290
 291        value = readl(chip->base + JZ_REG_GPIO_PIN);
 292        if (value & mask)
 293                reg += JZ_REG_GPIO_DIRECTION_CLEAR;
 294        else
 295                reg += JZ_REG_GPIO_DIRECTION_SET;
 296
 297        writel(mask, reg);
 298}
 299
 300static void jz_gpio_irq_demux_handler(unsigned int irq, struct irq_desc *desc)
 301{
 302        uint32_t flag;
 303        unsigned int gpio_irq;
 304        struct jz_gpio_chip *chip = irq_desc_get_handler_data(desc);
 305
 306        flag = readl(chip->base + JZ_REG_GPIO_FLAG);
 307        if (!flag)
 308                return;
 309
 310        gpio_irq = chip->irq_base + __fls(flag);
 311
 312        jz_gpio_check_trigger_both(chip, gpio_irq);
 313
 314        generic_handle_irq(gpio_irq);
 315};
 316
 317static inline void jz_gpio_set_irq_bit(struct irq_data *data, unsigned int reg)
 318{
 319        struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
 320        writel(IRQ_TO_BIT(data->irq), chip->base + reg);
 321}
 322
 323static void jz_gpio_irq_unmask(struct irq_data *data)
 324{
 325        struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
 326
 327        jz_gpio_check_trigger_both(chip, data->irq);
 328        irq_gc_unmask_enable_reg(data);
 329};
 330
 331/* TODO: Check if function is gpio */
 332static unsigned int jz_gpio_irq_startup(struct irq_data *data)
 333{
 334        jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_SET);
 335        jz_gpio_irq_unmask(data);
 336        return 0;
 337}
 338
 339static void jz_gpio_irq_shutdown(struct irq_data *data)
 340{
 341        irq_gc_mask_disable_reg(data);
 342
 343        /* Set direction to input */
 344        jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
 345        jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_CLEAR);
 346}
 347
 348static int jz_gpio_irq_set_type(struct irq_data *data, unsigned int flow_type)
 349{
 350        struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
 351        unsigned int irq = data->irq;
 352
 353        if (flow_type == IRQ_TYPE_EDGE_BOTH) {
 354                uint32_t value = readl(chip->base + JZ_REG_GPIO_PIN);
 355                if (value & IRQ_TO_BIT(irq))
 356                        flow_type = IRQ_TYPE_EDGE_FALLING;
 357                else
 358                        flow_type = IRQ_TYPE_EDGE_RISING;
 359                chip->edge_trigger_both |= IRQ_TO_BIT(irq);
 360        } else {
 361                chip->edge_trigger_both &= ~IRQ_TO_BIT(irq);
 362        }
 363
 364        switch (flow_type) {
 365        case IRQ_TYPE_EDGE_RISING:
 366                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
 367                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
 368                break;
 369        case IRQ_TYPE_EDGE_FALLING:
 370                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
 371                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
 372                break;
 373        case IRQ_TYPE_LEVEL_HIGH:
 374                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
 375                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
 376                break;
 377        case IRQ_TYPE_LEVEL_LOW:
 378                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
 379                jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
 380                break;
 381        default:
 382                return -EINVAL;
 383        }
 384
 385        return 0;
 386}
 387
 388static int jz_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
 389{
 390        struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
 391
 392        irq_gc_set_wake(data, on);
 393        irq_set_irq_wake(chip->irq, on);
 394
 395        return 0;
 396}
 397
 398#define JZ4740_GPIO_CHIP(_bank) { \
 399        .irq_base = JZ4740_IRQ_GPIO_BASE_ ## _bank, \
 400        .gpio_chip = { \
 401                .label = "Bank " # _bank, \
 402                .owner = THIS_MODULE, \
 403                .set = jz_gpio_set_value, \
 404                .get = jz_gpio_get_value, \
 405                .direction_output = jz_gpio_direction_output, \
 406                .direction_input = jz_gpio_direction_input, \
 407                .base = JZ4740_GPIO_BASE_ ## _bank, \
 408                .ngpio = JZ4740_GPIO_NUM_ ## _bank, \
 409        }, \
 410}
 411
 412static struct jz_gpio_chip jz4740_gpio_chips[] = {
 413        JZ4740_GPIO_CHIP(A),
 414        JZ4740_GPIO_CHIP(B),
 415        JZ4740_GPIO_CHIP(C),
 416        JZ4740_GPIO_CHIP(D),
 417};
 418
 419static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
 420{
 421        struct irq_chip_generic *gc;
 422        struct irq_chip_type *ct;
 423
 424        chip->base = ioremap(JZ4740_GPIO_BASE_ADDR + (id * 0x100), 0x100);
 425
 426        chip->irq = JZ4740_IRQ_INTC_GPIO(id);
 427        irq_set_handler_data(chip->irq, chip);
 428        irq_set_chained_handler(chip->irq, jz_gpio_irq_demux_handler);
 429
 430        gc = irq_alloc_generic_chip(chip->gpio_chip.label, 1, chip->irq_base,
 431                chip->base, handle_level_irq);
 432
 433        gc->wake_enabled = IRQ_MSK(chip->gpio_chip.ngpio);
 434        gc->private = chip;
 435
 436        ct = gc->chip_types;
 437        ct->regs.enable = JZ_REG_GPIO_MASK_CLEAR;
 438        ct->regs.disable = JZ_REG_GPIO_MASK_SET;
 439        ct->regs.ack = JZ_REG_GPIO_FLAG_CLEAR;
 440
 441        ct->chip.name = "GPIO";
 442        ct->chip.irq_mask = irq_gc_mask_disable_reg;
 443        ct->chip.irq_unmask = jz_gpio_irq_unmask;
 444        ct->chip.irq_ack = irq_gc_ack_set_bit;
 445        ct->chip.irq_suspend = jz4740_irq_suspend;
 446        ct->chip.irq_resume = jz4740_irq_resume;
 447        ct->chip.irq_startup = jz_gpio_irq_startup;
 448        ct->chip.irq_shutdown = jz_gpio_irq_shutdown;
 449        ct->chip.irq_set_type = jz_gpio_irq_set_type;
 450        ct->chip.irq_set_wake = jz_gpio_irq_set_wake;
 451        ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
 452
 453        irq_setup_generic_chip(gc, IRQ_MSK(chip->gpio_chip.ngpio),
 454                IRQ_GC_INIT_NESTED_LOCK, 0, IRQ_NOPROBE | IRQ_LEVEL);
 455
 456        gpiochip_add(&chip->gpio_chip);
 457}
 458
 459static int __init jz4740_gpio_init(void)
 460{
 461        unsigned int i;
 462
 463        for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
 464                jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);
 465
 466        printk(KERN_INFO "JZ4740 GPIO initialized\n");
 467
 468        return 0;
 469}
 470arch_initcall(jz4740_gpio_init);
 471
 472#ifdef CONFIG_DEBUG_FS
 473
 474static inline void gpio_seq_reg(struct seq_file *s, struct jz_gpio_chip *chip,
 475        const char *name, unsigned int reg)
 476{
 477        seq_printf(s, "\t%s: %08x\n", name, readl(chip->base + reg));
 478}
 479
 480static int gpio_regs_show(struct seq_file *s, void *unused)
 481{
 482        struct jz_gpio_chip *chip = jz4740_gpio_chips;
 483        int i;
 484
 485        for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i, ++chip) {
 486                seq_printf(s, "==GPIO %d==\n", i);
 487                gpio_seq_reg(s, chip, "Pin", JZ_REG_GPIO_PIN);
 488                gpio_seq_reg(s, chip, "Data", JZ_REG_GPIO_DATA);
 489                gpio_seq_reg(s, chip, "Mask", JZ_REG_GPIO_MASK);
 490                gpio_seq_reg(s, chip, "Pull", JZ_REG_GPIO_PULL);
 491                gpio_seq_reg(s, chip, "Func", JZ_REG_GPIO_FUNC);
 492                gpio_seq_reg(s, chip, "Select", JZ_REG_GPIO_SELECT);
 493                gpio_seq_reg(s, chip, "Direction", JZ_REG_GPIO_DIRECTION);
 494                gpio_seq_reg(s, chip, "Trigger", JZ_REG_GPIO_TRIGGER);
 495                gpio_seq_reg(s, chip, "Flag", JZ_REG_GPIO_FLAG);
 496        }
 497
 498        return 0;
 499}
 500
 501static int gpio_regs_open(struct inode *inode, struct file *file)
 502{
 503        return single_open(file, gpio_regs_show, NULL);
 504}
 505
 506static const struct file_operations gpio_regs_operations = {
 507        .open           = gpio_regs_open,
 508        .read           = seq_read,
 509        .llseek         = seq_lseek,
 510        .release        = single_release,
 511};
 512
 513static int __init gpio_debugfs_init(void)
 514{
 515        (void) debugfs_create_file("jz_regs_gpio", S_IFREG | S_IRUGO,
 516                                NULL, NULL, &gpio_regs_operations);
 517        return 0;
 518}
 519subsys_initcall(gpio_debugfs_init);
 520
 521#endif
 522