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