linux/drivers/pinctrl/pinctrl-coh901.c
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   1/*
   2 * U300 GPIO module.
   3 *
   4 * Copyright (C) 2007-2012 ST-Ericsson AB
   5 * License terms: GNU General Public License (GPL) version 2
   6 * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
   7 * Author: Linus Walleij <linus.walleij@linaro.org>
   8 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
   9 */
  10#include <linux/module.h>
  11#include <linux/irq.h>
  12#include <linux/interrupt.h>
  13#include <linux/delay.h>
  14#include <linux/errno.h>
  15#include <linux/io.h>
  16#include <linux/irqdomain.h>
  17#include <linux/clk.h>
  18#include <linux/err.h>
  19#include <linux/platform_device.h>
  20#include <linux/gpio.h>
  21#include <linux/list.h>
  22#include <linux/slab.h>
  23#include <linux/pinctrl/consumer.h>
  24#include <linux/pinctrl/pinconf-generic.h>
  25#include "pinctrl-coh901.h"
  26
  27#define U300_GPIO_PORT_STRIDE                           (0x30)
  28/*
  29 * Control Register 32bit (R/W)
  30 * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores
  31 * gives the number of GPIO pins.
  32 * bit 8-2  (mask 0x000001FC) contains the core version ID.
  33 */
  34#define U300_GPIO_CR                                    (0x00)
  35#define U300_GPIO_CR_SYNC_SEL_ENABLE                    (0x00000002UL)
  36#define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE                 (0x00000001UL)
  37#define U300_GPIO_PXPDIR                                (0x04)
  38#define U300_GPIO_PXPDOR                                (0x08)
  39#define U300_GPIO_PXPCR                                 (0x0C)
  40#define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK              (0x0000FFFFUL)
  41#define U300_GPIO_PXPCR_PIN_MODE_MASK                   (0x00000003UL)
  42#define U300_GPIO_PXPCR_PIN_MODE_SHIFT                  (0x00000002UL)
  43#define U300_GPIO_PXPCR_PIN_MODE_INPUT                  (0x00000000UL)
  44#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL       (0x00000001UL)
  45#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN      (0x00000002UL)
  46#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE     (0x00000003UL)
  47#define U300_GPIO_PXPER                                 (0x10)
  48#define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK        (0x000000FFUL)
  49#define U300_GPIO_PXPER_PULL_UP_DISABLE                 (0x00000001UL)
  50#define U300_GPIO_PXIEV                                 (0x14)
  51#define U300_GPIO_PXIEN                                 (0x18)
  52#define U300_GPIO_PXIFR                                 (0x1C)
  53#define U300_GPIO_PXICR                                 (0x20)
  54#define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK             (0x000000FFUL)
  55#define U300_GPIO_PXICR_IRQ_CONFIG_MASK                 (0x00000001UL)
  56#define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE         (0x00000000UL)
  57#define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE          (0x00000001UL)
  58
  59/* 8 bits per port, no version has more than 7 ports */
  60#define U300_GPIO_NUM_PORTS 7
  61#define U300_GPIO_PINS_PER_PORT 8
  62#define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)
  63
  64struct u300_gpio {
  65        struct gpio_chip chip;
  66        struct list_head port_list;
  67        struct clk *clk;
  68        void __iomem *base;
  69        struct device *dev;
  70        u32 stride;
  71        /* Register offsets */
  72        u32 pcr;
  73        u32 dor;
  74        u32 dir;
  75        u32 per;
  76        u32 icr;
  77        u32 ien;
  78        u32 iev;
  79};
  80
  81struct u300_gpio_port {
  82        struct list_head node;
  83        struct u300_gpio *gpio;
  84        char name[8];
  85        struct irq_domain *domain;
  86        int irq;
  87        int number;
  88        u8 toggle_edge_mode;
  89};
  90
  91/*
  92 * Macro to expand to read a specific register found in the "gpio"
  93 * struct. It requires the struct u300_gpio *gpio variable to exist in
  94 * its context. It calculates the port offset from the given pin
  95 * offset, muliplies by the port stride and adds the register offset
  96 * so it provides a pointer to the desired register.
  97 */
  98#define U300_PIN_REG(pin, reg) \
  99        (gpio->base + (pin >> 3) * gpio->stride + gpio->reg)
 100
 101/*
 102 * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO
 103 * register.
 104 */
 105#define U300_PIN_BIT(pin) \
 106        (1 << (pin & 0x07))
 107
 108struct u300_gpio_confdata {
 109        u16 bias_mode;
 110        bool output;
 111        int outval;
 112};
 113
 114#define U300_FLOATING_INPUT { \
 115        .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
 116        .output = false, \
 117}
 118
 119#define U300_PULL_UP_INPUT { \
 120        .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
 121        .output = false, \
 122}
 123
 124#define U300_OUTPUT_LOW { \
 125        .output = true, \
 126        .outval = 0, \
 127}
 128
 129#define U300_OUTPUT_HIGH { \
 130        .output = true, \
 131        .outval = 1, \
 132}
 133
 134/* Initial configuration */
 135static const struct __initconst u300_gpio_confdata
 136bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
 137        /* Port 0, pins 0-7 */
 138        {
 139                U300_FLOATING_INPUT,
 140                U300_OUTPUT_HIGH,
 141                U300_FLOATING_INPUT,
 142                U300_OUTPUT_LOW,
 143                U300_OUTPUT_LOW,
 144                U300_OUTPUT_LOW,
 145                U300_OUTPUT_LOW,
 146                U300_OUTPUT_LOW,
 147        },
 148        /* Port 1, pins 0-7 */
 149        {
 150                U300_OUTPUT_LOW,
 151                U300_OUTPUT_LOW,
 152                U300_OUTPUT_LOW,
 153                U300_PULL_UP_INPUT,
 154                U300_FLOATING_INPUT,
 155                U300_OUTPUT_HIGH,
 156                U300_OUTPUT_LOW,
 157                U300_OUTPUT_LOW,
 158        },
 159        /* Port 2, pins 0-7 */
 160        {
 161                U300_FLOATING_INPUT,
 162                U300_FLOATING_INPUT,
 163                U300_FLOATING_INPUT,
 164                U300_FLOATING_INPUT,
 165                U300_OUTPUT_LOW,
 166                U300_PULL_UP_INPUT,
 167                U300_OUTPUT_LOW,
 168                U300_PULL_UP_INPUT,
 169        },
 170        /* Port 3, pins 0-7 */
 171        {
 172                U300_PULL_UP_INPUT,
 173                U300_OUTPUT_LOW,
 174                U300_FLOATING_INPUT,
 175                U300_FLOATING_INPUT,
 176                U300_FLOATING_INPUT,
 177                U300_FLOATING_INPUT,
 178                U300_FLOATING_INPUT,
 179                U300_FLOATING_INPUT,
 180        },
 181        /* Port 4, pins 0-7 */
 182        {
 183                U300_FLOATING_INPUT,
 184                U300_FLOATING_INPUT,
 185                U300_FLOATING_INPUT,
 186                U300_FLOATING_INPUT,
 187                U300_FLOATING_INPUT,
 188                U300_FLOATING_INPUT,
 189                U300_FLOATING_INPUT,
 190                U300_FLOATING_INPUT,
 191        },
 192        /* Port 5, pins 0-7 */
 193        {
 194                U300_FLOATING_INPUT,
 195                U300_FLOATING_INPUT,
 196                U300_FLOATING_INPUT,
 197                U300_FLOATING_INPUT,
 198                U300_FLOATING_INPUT,
 199                U300_FLOATING_INPUT,
 200                U300_FLOATING_INPUT,
 201                U300_FLOATING_INPUT,
 202        },
 203        /* Port 6, pind 0-7 */
 204        {
 205                U300_FLOATING_INPUT,
 206                U300_FLOATING_INPUT,
 207                U300_FLOATING_INPUT,
 208                U300_FLOATING_INPUT,
 209                U300_FLOATING_INPUT,
 210                U300_FLOATING_INPUT,
 211                U300_FLOATING_INPUT,
 212                U300_FLOATING_INPUT,
 213        }
 214};
 215
 216/**
 217 * to_u300_gpio() - get the pointer to u300_gpio
 218 * @chip: the gpio chip member of the structure u300_gpio
 219 */
 220static inline struct u300_gpio *to_u300_gpio(struct gpio_chip *chip)
 221{
 222        return container_of(chip, struct u300_gpio, chip);
 223}
 224
 225static int u300_gpio_request(struct gpio_chip *chip, unsigned offset)
 226{
 227        /*
 228         * Map back to global GPIO space and request muxing, the direction
 229         * parameter does not matter for this controller.
 230         */
 231        int gpio = chip->base + offset;
 232
 233        return pinctrl_request_gpio(gpio);
 234}
 235
 236static void u300_gpio_free(struct gpio_chip *chip, unsigned offset)
 237{
 238        int gpio = chip->base + offset;
 239
 240        pinctrl_free_gpio(gpio);
 241}
 242
 243static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
 244{
 245        struct u300_gpio *gpio = to_u300_gpio(chip);
 246
 247        return readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset);
 248}
 249
 250static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 251{
 252        struct u300_gpio *gpio = to_u300_gpio(chip);
 253        unsigned long flags;
 254        u32 val;
 255
 256        local_irq_save(flags);
 257
 258        val = readl(U300_PIN_REG(offset, dor));
 259        if (value)
 260                writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
 261        else
 262                writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
 263
 264        local_irq_restore(flags);
 265}
 266
 267static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 268{
 269        struct u300_gpio *gpio = to_u300_gpio(chip);
 270        unsigned long flags;
 271        u32 val;
 272
 273        local_irq_save(flags);
 274        val = readl(U300_PIN_REG(offset, pcr));
 275        /* Mask out this pin, note 2 bits per setting */
 276        val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
 277        writel(val, U300_PIN_REG(offset, pcr));
 278        local_irq_restore(flags);
 279        return 0;
 280}
 281
 282static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 283                                      int value)
 284{
 285        struct u300_gpio *gpio = to_u300_gpio(chip);
 286        unsigned long flags;
 287        u32 oldmode;
 288        u32 val;
 289
 290        local_irq_save(flags);
 291        val = readl(U300_PIN_REG(offset, pcr));
 292        /*
 293         * Drive mode must be set by the special mode set function, set
 294         * push/pull mode by default if no mode has been selected.
 295         */
 296        oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
 297                         ((offset & 0x07) << 1));
 298        /* mode = 0 means input, else some mode is already set */
 299        if (oldmode == 0) {
 300                val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
 301                         ((offset & 0x07) << 1));
 302                val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
 303                        << ((offset & 0x07) << 1));
 304                writel(val, U300_PIN_REG(offset, pcr));
 305        }
 306        u300_gpio_set(chip, offset, value);
 307        local_irq_restore(flags);
 308        return 0;
 309}
 310
 311static int u300_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 312{
 313        struct u300_gpio *gpio = to_u300_gpio(chip);
 314        int portno = offset >> 3;
 315        struct u300_gpio_port *port = NULL;
 316        struct list_head *p;
 317        int retirq;
 318        bool found = false;
 319
 320        list_for_each(p, &gpio->port_list) {
 321                port = list_entry(p, struct u300_gpio_port, node);
 322                if (port->number == portno) {
 323                        found = true;
 324                        break;
 325                }
 326        }
 327        if (!found) {
 328                dev_err(gpio->dev, "could not locate port for GPIO %d IRQ\n",
 329                        offset);
 330                return -EINVAL;
 331        }
 332
 333        /*
 334         * The local hwirqs on the port are the lower three bits, there
 335         * are exactly 8 IRQs per port since they are 8-bit
 336         */
 337        retirq = irq_find_mapping(port->domain, (offset & 0x7));
 338
 339        dev_dbg(gpio->dev, "request IRQ for GPIO %d, return %d from port %d\n",
 340                offset, retirq, port->number);
 341        return retirq;
 342}
 343
 344/* Returning -EINVAL means "supported but not available" */
 345int u300_gpio_config_get(struct gpio_chip *chip,
 346                         unsigned offset,
 347                         unsigned long *config)
 348{
 349        struct u300_gpio *gpio = to_u300_gpio(chip);
 350        enum pin_config_param param = (enum pin_config_param) *config;
 351        bool biasmode;
 352        u32 drmode;
 353
 354        /* One bit per pin, clamp to bool range */
 355        biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
 356
 357        /* Mask out the two bits for this pin and shift to bits 0,1 */
 358        drmode = readl(U300_PIN_REG(offset, pcr));
 359        drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
 360        drmode >>= ((offset & 0x07) << 1);
 361
 362        switch (param) {
 363        case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 364                *config = 0;
 365                if (biasmode)
 366                        return 0;
 367                else
 368                        return -EINVAL;
 369                break;
 370        case PIN_CONFIG_BIAS_PULL_UP:
 371                *config = 0;
 372                if (!biasmode)
 373                        return 0;
 374                else
 375                        return -EINVAL;
 376                break;
 377        case PIN_CONFIG_DRIVE_PUSH_PULL:
 378                *config = 0;
 379                if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
 380                        return 0;
 381                else
 382                        return -EINVAL;
 383                break;
 384        case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 385                *config = 0;
 386                if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
 387                        return 0;
 388                else
 389                        return -EINVAL;
 390                break;
 391        case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 392                *config = 0;
 393                if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
 394                        return 0;
 395                else
 396                        return -EINVAL;
 397                break;
 398        default:
 399                break;
 400        }
 401        return -ENOTSUPP;
 402}
 403
 404int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
 405                         enum pin_config_param param)
 406{
 407        struct u300_gpio *gpio = to_u300_gpio(chip);
 408        unsigned long flags;
 409        u32 val;
 410
 411        local_irq_save(flags);
 412        switch (param) {
 413        case PIN_CONFIG_BIAS_DISABLE:
 414        case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 415                val = readl(U300_PIN_REG(offset, per));
 416                writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
 417                break;
 418        case PIN_CONFIG_BIAS_PULL_UP:
 419                val = readl(U300_PIN_REG(offset, per));
 420                writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
 421                break;
 422        case PIN_CONFIG_DRIVE_PUSH_PULL:
 423                val = readl(U300_PIN_REG(offset, pcr));
 424                val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 425                         << ((offset & 0x07) << 1));
 426                val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
 427                        << ((offset & 0x07) << 1));
 428                writel(val, U300_PIN_REG(offset, pcr));
 429                break;
 430        case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 431                val = readl(U300_PIN_REG(offset, pcr));
 432                val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 433                         << ((offset & 0x07) << 1));
 434                val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
 435                        << ((offset & 0x07) << 1));
 436                writel(val, U300_PIN_REG(offset, pcr));
 437                break;
 438        case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 439                val = readl(U300_PIN_REG(offset, pcr));
 440                val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 441                         << ((offset & 0x07) << 1));
 442                val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
 443                        << ((offset & 0x07) << 1));
 444                writel(val, U300_PIN_REG(offset, pcr));
 445                break;
 446        default:
 447                local_irq_restore(flags);
 448                dev_err(gpio->dev, "illegal configuration requested\n");
 449                return -EINVAL;
 450        }
 451        local_irq_restore(flags);
 452        return 0;
 453}
 454
 455static struct gpio_chip u300_gpio_chip = {
 456        .label                  = "u300-gpio-chip",
 457        .owner                  = THIS_MODULE,
 458        .request                = u300_gpio_request,
 459        .free                   = u300_gpio_free,
 460        .get                    = u300_gpio_get,
 461        .set                    = u300_gpio_set,
 462        .direction_input        = u300_gpio_direction_input,
 463        .direction_output       = u300_gpio_direction_output,
 464        .to_irq                 = u300_gpio_to_irq,
 465};
 466
 467static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
 468{
 469        u32 val;
 470
 471        val = readl(U300_PIN_REG(offset, icr));
 472        /* Set mode depending on state */
 473        if (u300_gpio_get(&gpio->chip, offset)) {
 474                /* High now, let's trigger on falling edge next then */
 475                writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 476                dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
 477                        offset);
 478        } else {
 479                /* Low now, let's trigger on rising edge next then */
 480                writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 481                dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
 482                        offset);
 483        }
 484}
 485
 486static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
 487{
 488        struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
 489        struct u300_gpio *gpio = port->gpio;
 490        int offset = (port->number << 3) + d->hwirq;
 491        u32 val;
 492
 493        if ((trigger & IRQF_TRIGGER_RISING) &&
 494            (trigger & IRQF_TRIGGER_FALLING)) {
 495                /*
 496                 * The GPIO block can only trigger on falling OR rising edges,
 497                 * not both. So we need to toggle the mode whenever the pin
 498                 * goes from one state to the other with a special state flag
 499                 */
 500                dev_dbg(gpio->dev,
 501                        "trigger on both rising and falling edge on pin %d\n",
 502                        offset);
 503                port->toggle_edge_mode |= U300_PIN_BIT(offset);
 504                u300_toggle_trigger(gpio, offset);
 505        } else if (trigger & IRQF_TRIGGER_RISING) {
 506                dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
 507                        offset);
 508                val = readl(U300_PIN_REG(offset, icr));
 509                writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 510                port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
 511        } else if (trigger & IRQF_TRIGGER_FALLING) {
 512                dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
 513                        offset);
 514                val = readl(U300_PIN_REG(offset, icr));
 515                writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 516                port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
 517        }
 518
 519        return 0;
 520}
 521
 522static void u300_gpio_irq_enable(struct irq_data *d)
 523{
 524        struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
 525        struct u300_gpio *gpio = port->gpio;
 526        int offset = (port->number << 3) + d->hwirq;
 527        u32 val;
 528        unsigned long flags;
 529
 530        dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n",
 531                 d->hwirq, port->name, offset);
 532        local_irq_save(flags);
 533        val = readl(U300_PIN_REG(offset, ien));
 534        writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
 535        local_irq_restore(flags);
 536}
 537
 538static void u300_gpio_irq_disable(struct irq_data *d)
 539{
 540        struct u300_gpio_port *port = irq_data_get_irq_chip_data(d);
 541        struct u300_gpio *gpio = port->gpio;
 542        int offset = (port->number << 3) + d->hwirq;
 543        u32 val;
 544        unsigned long flags;
 545
 546        local_irq_save(flags);
 547        val = readl(U300_PIN_REG(offset, ien));
 548        writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
 549        local_irq_restore(flags);
 550}
 551
 552static struct irq_chip u300_gpio_irqchip = {
 553        .name                   = "u300-gpio-irqchip",
 554        .irq_enable             = u300_gpio_irq_enable,
 555        .irq_disable            = u300_gpio_irq_disable,
 556        .irq_set_type           = u300_gpio_irq_type,
 557
 558};
 559
 560static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
 561{
 562        struct u300_gpio_port *port = irq_get_handler_data(irq);
 563        struct u300_gpio *gpio = port->gpio;
 564        int pinoffset = port->number << 3; /* get the right stride */
 565        unsigned long val;
 566
 567        desc->irq_data.chip->irq_ack(&desc->irq_data);
 568        /* Read event register */
 569        val = readl(U300_PIN_REG(pinoffset, iev));
 570        /* Mask relevant bits */
 571        val &= 0xFFU; /* 8 bits per port */
 572        /* ACK IRQ (clear event) */
 573        writel(val, U300_PIN_REG(pinoffset, iev));
 574
 575        /* Call IRQ handler */
 576        if (val != 0) {
 577                int irqoffset;
 578
 579                for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
 580                        int pin_irq = irq_find_mapping(port->domain, irqoffset);
 581                        int offset = pinoffset + irqoffset;
 582
 583                        dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
 584                                pin_irq, offset);
 585                        generic_handle_irq(pin_irq);
 586                        /*
 587                         * Triggering IRQ on both rising and falling edge
 588                         * needs mockery
 589                         */
 590                        if (port->toggle_edge_mode & U300_PIN_BIT(offset))
 591                                u300_toggle_trigger(gpio, offset);
 592                }
 593        }
 594
 595        desc->irq_data.chip->irq_unmask(&desc->irq_data);
 596}
 597
 598static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
 599                                      int offset,
 600                                      const struct u300_gpio_confdata *conf)
 601{
 602        /* Set mode: input or output */
 603        if (conf->output) {
 604                u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
 605
 606                /* Deactivate bias mode for output */
 607                u300_gpio_config_set(&gpio->chip, offset,
 608                                     PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
 609
 610                /* Set drive mode for output */
 611                u300_gpio_config_set(&gpio->chip, offset,
 612                                     PIN_CONFIG_DRIVE_PUSH_PULL);
 613
 614                dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
 615                        offset, conf->outval);
 616        } else {
 617                u300_gpio_direction_input(&gpio->chip, offset);
 618
 619                /* Always set output low on input pins */
 620                u300_gpio_set(&gpio->chip, offset, 0);
 621
 622                /* Set bias mode for input */
 623                u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
 624
 625                dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
 626                        offset, conf->bias_mode);
 627        }
 628}
 629
 630static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
 631{
 632        int i, j;
 633
 634        /* Write default config and values to all pins */
 635        for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
 636                for (j = 0; j < 8; j++) {
 637                        const struct u300_gpio_confdata *conf;
 638                        int offset = (i*8) + j;
 639
 640                        conf = &bs335_gpio_config[i][j];
 641                        u300_gpio_init_pin(gpio, offset, conf);
 642                }
 643        }
 644}
 645
 646static inline void u300_gpio_free_ports(struct u300_gpio *gpio)
 647{
 648        struct u300_gpio_port *port;
 649        struct list_head *p, *n;
 650
 651        list_for_each_safe(p, n, &gpio->port_list) {
 652                port = list_entry(p, struct u300_gpio_port, node);
 653                list_del(&port->node);
 654                if (port->domain)
 655                        irq_domain_remove(port->domain);
 656                kfree(port);
 657        }
 658}
 659
 660/*
 661 * Here we map a GPIO in the local gpio_chip pin space to a pin in
 662 * the local pinctrl pin space. The pin controller used is
 663 * pinctrl-u300.
 664 */
 665struct coh901_pinpair {
 666        unsigned int offset;
 667        unsigned int pin_base;
 668};
 669
 670#define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b }
 671
 672static struct coh901_pinpair coh901_pintable[] = {
 673        COH901_PINRANGE(10, 426),
 674        COH901_PINRANGE(11, 180),
 675        COH901_PINRANGE(12, 165), /* MS/MMC card insertion */
 676        COH901_PINRANGE(13, 179),
 677        COH901_PINRANGE(14, 178),
 678        COH901_PINRANGE(16, 194),
 679        COH901_PINRANGE(17, 193),
 680        COH901_PINRANGE(18, 192),
 681        COH901_PINRANGE(19, 191),
 682        COH901_PINRANGE(20, 186),
 683        COH901_PINRANGE(21, 185),
 684        COH901_PINRANGE(22, 184),
 685        COH901_PINRANGE(23, 183),
 686        COH901_PINRANGE(24, 182),
 687        COH901_PINRANGE(25, 181),
 688};
 689
 690static int __init u300_gpio_probe(struct platform_device *pdev)
 691{
 692        struct u300_gpio *gpio;
 693        struct resource *memres;
 694        int err = 0;
 695        int portno;
 696        u32 val;
 697        u32 ifr;
 698        int i;
 699
 700        gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL);
 701        if (gpio == NULL)
 702                return -ENOMEM;
 703
 704        gpio->chip = u300_gpio_chip;
 705        gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT;
 706        gpio->chip.dev = &pdev->dev;
 707        gpio->chip.base = 0;
 708        gpio->dev = &pdev->dev;
 709
 710        memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 711        gpio->base = devm_ioremap_resource(&pdev->dev, memres);
 712        if (IS_ERR(gpio->base))
 713                return PTR_ERR(gpio->base);
 714
 715        gpio->clk = devm_clk_get(gpio->dev, NULL);
 716        if (IS_ERR(gpio->clk)) {
 717                err = PTR_ERR(gpio->clk);
 718                dev_err(gpio->dev, "could not get GPIO clock\n");
 719                return err;
 720        }
 721
 722        err = clk_prepare_enable(gpio->clk);
 723        if (err) {
 724                dev_err(gpio->dev, "could not enable GPIO clock\n");
 725                return err;
 726        }
 727
 728        dev_info(gpio->dev,
 729                 "initializing GPIO Controller COH 901 571/3\n");
 730        gpio->stride = U300_GPIO_PORT_STRIDE;
 731        gpio->pcr = U300_GPIO_PXPCR;
 732        gpio->dor = U300_GPIO_PXPDOR;
 733        gpio->dir = U300_GPIO_PXPDIR;
 734        gpio->per = U300_GPIO_PXPER;
 735        gpio->icr = U300_GPIO_PXICR;
 736        gpio->ien = U300_GPIO_PXIEN;
 737        gpio->iev = U300_GPIO_PXIEV;
 738        ifr = U300_GPIO_PXIFR;
 739
 740        val = readl(gpio->base + U300_GPIO_CR);
 741        dev_info(gpio->dev, "COH901571/3 block version: %d, " \
 742                 "number of cores: %d totalling %d pins\n",
 743                 ((val & 0x000001FC) >> 2),
 744                 ((val & 0x0000FE00) >> 9),
 745                 ((val & 0x0000FE00) >> 9) * 8);
 746        writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE,
 747               gpio->base + U300_GPIO_CR);
 748        u300_gpio_init_coh901571(gpio);
 749
 750        /* Add each port with its IRQ separately */
 751        INIT_LIST_HEAD(&gpio->port_list);
 752        for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
 753                struct u300_gpio_port *port =
 754                        kmalloc(sizeof(struct u300_gpio_port), GFP_KERNEL);
 755
 756                if (!port) {
 757                        dev_err(gpio->dev, "out of memory\n");
 758                        err = -ENOMEM;
 759                        goto err_no_port;
 760                }
 761
 762                snprintf(port->name, 8, "gpio%d", portno);
 763                port->number = portno;
 764                port->gpio = gpio;
 765
 766                port->irq = platform_get_irq(pdev, portno);
 767
 768                dev_dbg(gpio->dev, "register IRQ %d for port %s\n", port->irq,
 769                        port->name);
 770
 771                port->domain = irq_domain_add_linear(pdev->dev.of_node,
 772                                                     U300_GPIO_PINS_PER_PORT,
 773                                                     &irq_domain_simple_ops,
 774                                                     port);
 775                if (!port->domain) {
 776                        err = -ENOMEM;
 777                        goto err_no_domain;
 778                }
 779
 780                irq_set_chained_handler(port->irq, u300_gpio_irq_handler);
 781                irq_set_handler_data(port->irq, port);
 782
 783                /* For each GPIO pin set the unique IRQ handler */
 784                for (i = 0; i < U300_GPIO_PINS_PER_PORT; i++) {
 785                        int irqno = irq_create_mapping(port->domain, i);
 786
 787                        dev_dbg(gpio->dev, "GPIO%d on port %s gets IRQ %d\n",
 788                                gpio->chip.base + (port->number << 3) + i,
 789                                port->name, irqno);
 790                        irq_set_chip_and_handler(irqno, &u300_gpio_irqchip,
 791                                                 handle_simple_irq);
 792                        set_irq_flags(irqno, IRQF_VALID);
 793                        irq_set_chip_data(irqno, port);
 794                }
 795
 796                /* Turns off irq force (test register) for this port */
 797                writel(0x0, gpio->base + portno * gpio->stride + ifr);
 798
 799                list_add_tail(&port->node, &gpio->port_list);
 800        }
 801        dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
 802
 803#ifdef CONFIG_OF_GPIO
 804        gpio->chip.of_node = pdev->dev.of_node;
 805#endif
 806        err = gpiochip_add(&gpio->chip);
 807        if (err) {
 808                dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
 809                goto err_no_chip;
 810        }
 811
 812        /*
 813         * Add pinctrl pin ranges, the pin controller must be registered
 814         * at this point
 815         */
 816        for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) {
 817                struct coh901_pinpair *p = &coh901_pintable[i];
 818
 819                err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300",
 820                                             p->offset, p->pin_base, 1);
 821                if (err)
 822                        goto err_no_range;
 823        }
 824
 825        platform_set_drvdata(pdev, gpio);
 826
 827        return 0;
 828
 829err_no_range:
 830        if (gpiochip_remove(&gpio->chip))
 831                dev_err(&pdev->dev, "failed to remove gpio chip\n");
 832err_no_chip:
 833err_no_domain:
 834err_no_port:
 835        u300_gpio_free_ports(gpio);
 836        clk_disable_unprepare(gpio->clk);
 837        dev_err(&pdev->dev, "module ERROR:%d\n", err);
 838        return err;
 839}
 840
 841static int __exit u300_gpio_remove(struct platform_device *pdev)
 842{
 843        struct u300_gpio *gpio = platform_get_drvdata(pdev);
 844        int err;
 845
 846        /* Turn off the GPIO block */
 847        writel(0x00000000U, gpio->base + U300_GPIO_CR);
 848
 849        err = gpiochip_remove(&gpio->chip);
 850        if (err < 0) {
 851                dev_err(gpio->dev, "unable to remove gpiochip: %d\n", err);
 852                return err;
 853        }
 854        u300_gpio_free_ports(gpio);
 855        clk_disable_unprepare(gpio->clk);
 856        return 0;
 857}
 858
 859static const struct of_device_id u300_gpio_match[] = {
 860        { .compatible = "stericsson,gpio-coh901" },
 861        {},
 862};
 863
 864static struct platform_driver u300_gpio_driver = {
 865        .driver         = {
 866                .name   = "u300-gpio",
 867                .of_match_table = u300_gpio_match,
 868        },
 869        .remove         = __exit_p(u300_gpio_remove),
 870};
 871
 872static int __init u300_gpio_init(void)
 873{
 874        return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
 875}
 876
 877static void __exit u300_gpio_exit(void)
 878{
 879        platform_driver_unregister(&u300_gpio_driver);
 880}
 881
 882arch_initcall(u300_gpio_init);
 883module_exit(u300_gpio_exit);
 884
 885MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 886MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
 887MODULE_LICENSE("GPL");
 888
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