linux/drivers/gpio/gpio-mvebu.c
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   1/*
   2 * GPIO driver for Marvell SoCs
   3 *
   4 * Copyright (C) 2012 Marvell
   5 *
   6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   7 * Andrew Lunn <andrew@lunn.ch>
   8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   9 *
  10 * This file is licensed under the terms of the GNU General Public
  11 * License version 2.  This program is licensed "as is" without any
  12 * warranty of any kind, whether express or implied.
  13 *
  14 * This driver is a fairly straightforward GPIO driver for the
  15 * complete family of Marvell EBU SoC platforms (Orion, Dove,
  16 * Kirkwood, Discovery, Armada 370/XP). The only complexity of this
  17 * driver is the different register layout that exists between the
  18 * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
  19 * platforms (MV78200 from the Discovery family and the Armada
  20 * XP). Therefore, this driver handles three variants of the GPIO
  21 * block:
  22 * - the basic variant, called "orion-gpio", with the simplest
  23 *   register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
  24 *   non-SMP Discovery systems
  25 * - the mv78200 variant for MV78200 Discovery systems. This variant
  26 *   turns the edge mask and level mask registers into CPU0 edge
  27 *   mask/level mask registers, and adds CPU1 edge mask/level mask
  28 *   registers.
  29 * - the armadaxp variant for Armada XP systems. This variant keeps
  30 *   the normal cause/edge mask/level mask registers when the global
  31 *   interrupts are used, but adds per-CPU cause/edge mask/level mask
  32 *   registers n a separate memory area for the per-CPU GPIO
  33 *   interrupts.
  34 */
  35
  36#include <linux/err.h>
  37#include <linux/module.h>
  38#include <linux/gpio.h>
  39#include <linux/irq.h>
  40#include <linux/slab.h>
  41#include <linux/irqdomain.h>
  42#include <linux/io.h>
  43#include <linux/of_irq.h>
  44#include <linux/of_device.h>
  45#include <linux/clk.h>
  46#include <linux/pinctrl/consumer.h>
  47
  48/*
  49 * GPIO unit register offsets.
  50 */
  51#define GPIO_OUT_OFF            0x0000
  52#define GPIO_IO_CONF_OFF        0x0004
  53#define GPIO_BLINK_EN_OFF       0x0008
  54#define GPIO_IN_POL_OFF         0x000c
  55#define GPIO_DATA_IN_OFF        0x0010
  56#define GPIO_EDGE_CAUSE_OFF     0x0014
  57#define GPIO_EDGE_MASK_OFF      0x0018
  58#define GPIO_LEVEL_MASK_OFF     0x001c
  59
  60/* The MV78200 has per-CPU registers for edge mask and level mask */
  61#define GPIO_EDGE_MASK_MV78200_OFF(cpu)   ((cpu) ? 0x30 : 0x18)
  62#define GPIO_LEVEL_MASK_MV78200_OFF(cpu)  ((cpu) ? 0x34 : 0x1C)
  63
  64/* The Armada XP has per-CPU registers for interrupt cause, interrupt
  65 * mask and interrupt level mask. Those are relative to the
  66 * percpu_membase. */
  67#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
  68#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu)  (0x10 + (cpu) * 0x4)
  69#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
  70
  71#define MVEBU_GPIO_SOC_VARIANT_ORION    0x1
  72#define MVEBU_GPIO_SOC_VARIANT_MV78200  0x2
  73#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
  74
  75#define MVEBU_MAX_GPIO_PER_BANK         32
  76
  77struct mvebu_gpio_chip {
  78        struct gpio_chip   chip;
  79        spinlock_t         lock;
  80        void __iomem      *membase;
  81        void __iomem      *percpu_membase;
  82        unsigned int       irqbase;
  83        struct irq_domain *domain;
  84        int                soc_variant;
  85};
  86
  87/*
  88 * Functions returning addresses of individual registers for a given
  89 * GPIO controller.
  90 */
  91static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
  92{
  93        return mvchip->membase + GPIO_OUT_OFF;
  94}
  95
  96static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
  97{
  98        return mvchip->membase + GPIO_BLINK_EN_OFF;
  99}
 100
 101static inline void __iomem *mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
 102{
 103        return mvchip->membase + GPIO_IO_CONF_OFF;
 104}
 105
 106static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
 107{
 108        return mvchip->membase + GPIO_IN_POL_OFF;
 109}
 110
 111static inline void __iomem *mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
 112{
 113        return mvchip->membase + GPIO_DATA_IN_OFF;
 114}
 115
 116static inline void __iomem *mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
 117{
 118        int cpu;
 119
 120        switch (mvchip->soc_variant) {
 121        case MVEBU_GPIO_SOC_VARIANT_ORION:
 122        case MVEBU_GPIO_SOC_VARIANT_MV78200:
 123                return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
 124        case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
 125                cpu = smp_processor_id();
 126                return mvchip->percpu_membase + GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
 127        default:
 128                BUG();
 129        }
 130}
 131
 132static inline void __iomem *mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
 133{
 134        int cpu;
 135
 136        switch (mvchip->soc_variant) {
 137        case MVEBU_GPIO_SOC_VARIANT_ORION:
 138                return mvchip->membase + GPIO_EDGE_MASK_OFF;
 139        case MVEBU_GPIO_SOC_VARIANT_MV78200:
 140                cpu = smp_processor_id();
 141                return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
 142        case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
 143                cpu = smp_processor_id();
 144                return mvchip->percpu_membase + GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
 145        default:
 146                BUG();
 147        }
 148}
 149
 150static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
 151{
 152        int cpu;
 153
 154        switch (mvchip->soc_variant) {
 155        case MVEBU_GPIO_SOC_VARIANT_ORION:
 156                return mvchip->membase + GPIO_LEVEL_MASK_OFF;
 157        case MVEBU_GPIO_SOC_VARIANT_MV78200:
 158                cpu = smp_processor_id();
 159                return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
 160        case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
 161                cpu = smp_processor_id();
 162                return mvchip->percpu_membase + GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
 163        default:
 164                BUG();
 165        }
 166}
 167
 168/*
 169 * Functions implementing the gpio_chip methods
 170 */
 171
 172static int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin)
 173{
 174        return pinctrl_request_gpio(chip->base + pin);
 175}
 176
 177static void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin)
 178{
 179        pinctrl_free_gpio(chip->base + pin);
 180}
 181
 182static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
 183{
 184        struct mvebu_gpio_chip *mvchip =
 185                container_of(chip, struct mvebu_gpio_chip, chip);
 186        unsigned long flags;
 187        u32 u;
 188
 189        spin_lock_irqsave(&mvchip->lock, flags);
 190        u = readl_relaxed(mvebu_gpioreg_out(mvchip));
 191        if (value)
 192                u |= 1 << pin;
 193        else
 194                u &= ~(1 << pin);
 195        writel_relaxed(u, mvebu_gpioreg_out(mvchip));
 196        spin_unlock_irqrestore(&mvchip->lock, flags);
 197}
 198
 199static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
 200{
 201        struct mvebu_gpio_chip *mvchip =
 202                container_of(chip, struct mvebu_gpio_chip, chip);
 203        u32 u;
 204
 205        if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
 206                u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
 207                        readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 208        } else {
 209                u = readl_relaxed(mvebu_gpioreg_out(mvchip));
 210        }
 211
 212        return (u >> pin) & 1;
 213}
 214
 215static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
 216{
 217        struct mvebu_gpio_chip *mvchip =
 218                container_of(chip, struct mvebu_gpio_chip, chip);
 219        unsigned long flags;
 220        u32 u;
 221
 222        spin_lock_irqsave(&mvchip->lock, flags);
 223        u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
 224        if (value)
 225                u |= 1 << pin;
 226        else
 227                u &= ~(1 << pin);
 228        writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
 229        spin_unlock_irqrestore(&mvchip->lock, flags);
 230}
 231
 232static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
 233{
 234        struct mvebu_gpio_chip *mvchip =
 235                container_of(chip, struct mvebu_gpio_chip, chip);
 236        unsigned long flags;
 237        int ret;
 238        u32 u;
 239
 240        /* Check with the pinctrl driver whether this pin is usable as
 241         * an input GPIO */
 242        ret = pinctrl_gpio_direction_input(chip->base + pin);
 243        if (ret)
 244                return ret;
 245
 246        spin_lock_irqsave(&mvchip->lock, flags);
 247        u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
 248        u |= 1 << pin;
 249        writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
 250        spin_unlock_irqrestore(&mvchip->lock, flags);
 251
 252        return 0;
 253}
 254
 255static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
 256                                       int value)
 257{
 258        struct mvebu_gpio_chip *mvchip =
 259                container_of(chip, struct mvebu_gpio_chip, chip);
 260        unsigned long flags;
 261        int ret;
 262        u32 u;
 263
 264        /* Check with the pinctrl driver whether this pin is usable as
 265         * an output GPIO */
 266        ret = pinctrl_gpio_direction_output(chip->base + pin);
 267        if (ret)
 268                return ret;
 269
 270        mvebu_gpio_blink(chip, pin, 0);
 271        mvebu_gpio_set(chip, pin, value);
 272
 273        spin_lock_irqsave(&mvchip->lock, flags);
 274        u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
 275        u &= ~(1 << pin);
 276        writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
 277        spin_unlock_irqrestore(&mvchip->lock, flags);
 278
 279        return 0;
 280}
 281
 282static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
 283{
 284        struct mvebu_gpio_chip *mvchip =
 285                container_of(chip, struct mvebu_gpio_chip, chip);
 286        return irq_create_mapping(mvchip->domain, pin);
 287}
 288
 289/*
 290 * Functions implementing the irq_chip methods
 291 */
 292static void mvebu_gpio_irq_ack(struct irq_data *d)
 293{
 294        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 295        struct mvebu_gpio_chip *mvchip = gc->private;
 296        u32 mask = ~(1 << (d->irq - gc->irq_base));
 297
 298        irq_gc_lock(gc);
 299        writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
 300        irq_gc_unlock(gc);
 301}
 302
 303static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
 304{
 305        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 306        struct mvebu_gpio_chip *mvchip = gc->private;
 307        u32 mask = 1 << (d->irq - gc->irq_base);
 308
 309        irq_gc_lock(gc);
 310        gc->mask_cache &= ~mask;
 311        writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip));
 312        irq_gc_unlock(gc);
 313}
 314
 315static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
 316{
 317        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 318        struct mvebu_gpio_chip *mvchip = gc->private;
 319        u32 mask = 1 << (d->irq - gc->irq_base);
 320
 321        irq_gc_lock(gc);
 322        gc->mask_cache |= mask;
 323        writel_relaxed(gc->mask_cache, mvebu_gpioreg_edge_mask(mvchip));
 324        irq_gc_unlock(gc);
 325}
 326
 327static void mvebu_gpio_level_irq_mask(struct irq_data *d)
 328{
 329        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 330        struct mvebu_gpio_chip *mvchip = gc->private;
 331        u32 mask = 1 << (d->irq - gc->irq_base);
 332
 333        irq_gc_lock(gc);
 334        gc->mask_cache &= ~mask;
 335        writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip));
 336        irq_gc_unlock(gc);
 337}
 338
 339static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
 340{
 341        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 342        struct mvebu_gpio_chip *mvchip = gc->private;
 343        u32 mask = 1 << (d->irq - gc->irq_base);
 344
 345        irq_gc_lock(gc);
 346        gc->mask_cache |= mask;
 347        writel_relaxed(gc->mask_cache, mvebu_gpioreg_level_mask(mvchip));
 348        irq_gc_unlock(gc);
 349}
 350
 351/*****************************************************************************
 352 * MVEBU GPIO IRQ
 353 *
 354 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
 355 * value of the line or the opposite value.
 356 *
 357 * Level IRQ handlers: DATA_IN is used directly as cause register.
 358 *                     Interrupt are masked by LEVEL_MASK registers.
 359 * Edge IRQ handlers:  Change in DATA_IN are latched in EDGE_CAUSE.
 360 *                     Interrupt are masked by EDGE_MASK registers.
 361 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
 362 *                     the polarity to catch the next line transaction.
 363 *                     This is a race condition that might not perfectly
 364 *                     work on some use cases.
 365 *
 366 * Every eight GPIO lines are grouped (OR'ed) before going up to main
 367 * cause register.
 368 *
 369 *                    EDGE  cause    mask
 370 *        data-in   /--------| |-----| |----\
 371 *     -----| |-----                         ---- to main cause reg
 372 *           X      \----------------| |----/
 373 *        polarity    LEVEL          mask
 374 *
 375 ****************************************************************************/
 376
 377static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 378{
 379        struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
 380        struct irq_chip_type *ct = irq_data_get_chip_type(d);
 381        struct mvebu_gpio_chip *mvchip = gc->private;
 382        int pin;
 383        u32 u;
 384
 385        pin = d->hwirq;
 386
 387        u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
 388        if (!u) {
 389                return -EINVAL;
 390        }
 391
 392        type &= IRQ_TYPE_SENSE_MASK;
 393        if (type == IRQ_TYPE_NONE)
 394                return -EINVAL;
 395
 396        /* Check if we need to change chip and handler */
 397        if (!(ct->type & type))
 398                if (irq_setup_alt_chip(d, type))
 399                        return -EINVAL;
 400
 401        /*
 402         * Configure interrupt polarity.
 403         */
 404        switch (type) {
 405        case IRQ_TYPE_EDGE_RISING:
 406        case IRQ_TYPE_LEVEL_HIGH:
 407                u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 408                u &= ~(1 << pin);
 409                writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
 410                break;
 411        case IRQ_TYPE_EDGE_FALLING:
 412        case IRQ_TYPE_LEVEL_LOW:
 413                u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 414                u |= 1 << pin;
 415                writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
 416                break;
 417        case IRQ_TYPE_EDGE_BOTH: {
 418                u32 v;
 419
 420                v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
 421                        readl_relaxed(mvebu_gpioreg_data_in(mvchip));
 422
 423                /*
 424                 * set initial polarity based on current input level
 425                 */
 426                u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 427                if (v & (1 << pin))
 428                        u |= 1 << pin;          /* falling */
 429                else
 430                        u &= ~(1 << pin);       /* rising */
 431                writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
 432                break;
 433        }
 434        }
 435        return 0;
 436}
 437
 438static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 439{
 440        struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq);
 441        u32 cause, type;
 442        int i;
 443
 444        if (mvchip == NULL)
 445                return;
 446
 447        cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
 448                readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
 449        cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
 450                readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
 451
 452        for (i = 0; i < mvchip->chip.ngpio; i++) {
 453                int irq;
 454
 455                irq = mvchip->irqbase + i;
 456
 457                if (!(cause & (1 << i)))
 458                        continue;
 459
 460                type = irq_get_trigger_type(irq);
 461                if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
 462                        /* Swap polarity (race with GPIO line) */
 463                        u32 polarity;
 464
 465                        polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 466                        polarity ^= 1 << i;
 467                        writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
 468                }
 469                generic_handle_irq(irq);
 470        }
 471}
 472
 473#ifdef CONFIG_DEBUG_FS
 474#include <linux/seq_file.h>
 475
 476static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 477{
 478        struct mvebu_gpio_chip *mvchip =
 479                container_of(chip, struct mvebu_gpio_chip, chip);
 480        u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
 481        int i;
 482
 483        out     = readl_relaxed(mvebu_gpioreg_out(mvchip));
 484        io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
 485        blink   = readl_relaxed(mvebu_gpioreg_blink(mvchip));
 486        in_pol  = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
 487        data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
 488        cause   = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
 489        edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
 490        lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
 491
 492        for (i = 0; i < chip->ngpio; i++) {
 493                const char *label;
 494                u32 msk;
 495                bool is_out;
 496
 497                label = gpiochip_is_requested(chip, i);
 498                if (!label)
 499                        continue;
 500
 501                msk = 1 << i;
 502                is_out = !(io_conf & msk);
 503
 504                seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
 505
 506                if (is_out) {
 507                        seq_printf(s, " out %s %s\n",
 508                                   out & msk ? "hi" : "lo",
 509                                   blink & msk ? "(blink )" : "");
 510                        continue;
 511                }
 512
 513                seq_printf(s, " in  %s (act %s) - IRQ",
 514                           (data_in ^ in_pol) & msk  ? "hi" : "lo",
 515                           in_pol & msk ? "lo" : "hi");
 516                if (!((edg_msk | lvl_msk) & msk)) {
 517                        seq_printf(s, " disabled\n");
 518                        continue;
 519                }
 520                if (edg_msk & msk)
 521                        seq_printf(s, " edge ");
 522                if (lvl_msk & msk)
 523                        seq_printf(s, " level");
 524                seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");
 525        }
 526}
 527#else
 528#define mvebu_gpio_dbg_show NULL
 529#endif
 530
 531static struct of_device_id mvebu_gpio_of_match[] = {
 532        {
 533                .compatible = "marvell,orion-gpio",
 534                .data       = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
 535        },
 536        {
 537                .compatible = "marvell,mv78200-gpio",
 538                .data       = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
 539        },
 540        {
 541                .compatible = "marvell,armadaxp-gpio",
 542                .data       = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
 543        },
 544        {
 545                /* sentinel */
 546        },
 547};
 548MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
 549
 550static int mvebu_gpio_probe(struct platform_device *pdev)
 551{
 552        struct mvebu_gpio_chip *mvchip;
 553        const struct of_device_id *match;
 554        struct device_node *np = pdev->dev.of_node;
 555        struct resource *res;
 556        struct irq_chip_generic *gc;
 557        struct irq_chip_type *ct;
 558        struct clk *clk;
 559        unsigned int ngpios;
 560        int soc_variant;
 561        int i, cpu, id;
 562
 563        match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
 564        if (match)
 565                soc_variant = (int) match->data;
 566        else
 567                soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
 568
 569        mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), GFP_KERNEL);
 570        if (!mvchip) {
 571                dev_err(&pdev->dev, "Cannot allocate memory\n");
 572                return -ENOMEM;
 573        }
 574
 575        if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
 576                dev_err(&pdev->dev, "Missing ngpios OF property\n");
 577                return -ENODEV;
 578        }
 579
 580        id = of_alias_get_id(pdev->dev.of_node, "gpio");
 581        if (id < 0) {
 582                dev_err(&pdev->dev, "Couldn't get OF id\n");
 583                return id;
 584        }
 585
 586        clk = devm_clk_get(&pdev->dev, NULL);
 587        /* Not all SoCs require a clock.*/
 588        if (!IS_ERR(clk))
 589                clk_prepare_enable(clk);
 590
 591        mvchip->soc_variant = soc_variant;
 592        mvchip->chip.label = dev_name(&pdev->dev);
 593        mvchip->chip.dev = &pdev->dev;
 594        mvchip->chip.request = mvebu_gpio_request;
 595        mvchip->chip.free = mvebu_gpio_free;
 596        mvchip->chip.direction_input = mvebu_gpio_direction_input;
 597        mvchip->chip.get = mvebu_gpio_get;
 598        mvchip->chip.direction_output = mvebu_gpio_direction_output;
 599        mvchip->chip.set = mvebu_gpio_set;
 600        mvchip->chip.to_irq = mvebu_gpio_to_irq;
 601        mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
 602        mvchip->chip.ngpio = ngpios;
 603        mvchip->chip.can_sleep = 0;
 604        mvchip->chip.of_node = np;
 605        mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
 606
 607        spin_lock_init(&mvchip->lock);
 608        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 609        mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
 610        if (IS_ERR(mvchip->membase))
 611                return PTR_ERR(mvchip->membase);
 612
 613        /* The Armada XP has a second range of registers for the
 614         * per-CPU registers */
 615        if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
 616                res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 617                mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
 618                                                               res);
 619                if (IS_ERR(mvchip->percpu_membase))
 620                        return PTR_ERR(mvchip->percpu_membase);
 621        }
 622
 623        /*
 624         * Mask and clear GPIO interrupts.
 625         */
 626        switch (soc_variant) {
 627        case MVEBU_GPIO_SOC_VARIANT_ORION:
 628                writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
 629                writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
 630                writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
 631                break;
 632        case MVEBU_GPIO_SOC_VARIANT_MV78200:
 633                writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
 634                for (cpu = 0; cpu < 2; cpu++) {
 635                        writel_relaxed(0, mvchip->membase +
 636                                       GPIO_EDGE_MASK_MV78200_OFF(cpu));
 637                        writel_relaxed(0, mvchip->membase +
 638                                       GPIO_LEVEL_MASK_MV78200_OFF(cpu));
 639                }
 640                break;
 641        case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
 642                writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
 643                writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
 644                writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
 645                for (cpu = 0; cpu < 4; cpu++) {
 646                        writel_relaxed(0, mvchip->percpu_membase +
 647                                       GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
 648                        writel_relaxed(0, mvchip->percpu_membase +
 649                                       GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
 650                        writel_relaxed(0, mvchip->percpu_membase +
 651                                       GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
 652                }
 653                break;
 654        default:
 655                BUG();
 656        }
 657
 658        gpiochip_add(&mvchip->chip);
 659
 660        /* Some gpio controllers do not provide irq support */
 661        if (!of_irq_count(np))
 662                return 0;
 663
 664        /* Setup the interrupt handlers. Each chip can have up to 4
 665         * interrupt handlers, with each handler dealing with 8 GPIO
 666         * pins. */
 667        for (i = 0; i < 4; i++) {
 668                int irq;
 669                irq = platform_get_irq(pdev, i);
 670                if (irq < 0)
 671                        continue;
 672                irq_set_handler_data(irq, mvchip);
 673                irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
 674        }
 675
 676        mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
 677        if (mvchip->irqbase < 0) {
 678                dev_err(&pdev->dev, "no irqs\n");
 679                return -ENOMEM;
 680        }
 681
 682        gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
 683                                    mvchip->membase, handle_level_irq);
 684        if (!gc) {
 685                dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
 686                return -ENOMEM;
 687        }
 688
 689        gc->private = mvchip;
 690        ct = &gc->chip_types[0];
 691        ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
 692        ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
 693        ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
 694        ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
 695        ct->chip.name = mvchip->chip.label;
 696
 697        ct = &gc->chip_types[1];
 698        ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 699        ct->chip.irq_ack = mvebu_gpio_irq_ack;
 700        ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
 701        ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
 702        ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
 703        ct->handler = handle_edge_irq;
 704        ct->chip.name = mvchip->chip.label;
 705
 706        irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
 707                               IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
 708
 709        /* Setup irq domain on top of the generic chip. */
 710        mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
 711                                               mvchip->irqbase,
 712                                               &irq_domain_simple_ops,
 713                                               mvchip);
 714        if (!mvchip->domain) {
 715                dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
 716                        mvchip->chip.label);
 717                irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
 718                                        IRQ_LEVEL | IRQ_NOPROBE);
 719                kfree(gc);
 720                return -ENODEV;
 721        }
 722
 723        return 0;
 724}
 725
 726static struct platform_driver mvebu_gpio_driver = {
 727        .driver         = {
 728                .name           = "mvebu-gpio",
 729                .owner          = THIS_MODULE,
 730                .of_match_table = mvebu_gpio_of_match,
 731        },
 732        .probe          = mvebu_gpio_probe,
 733};
 734
 735static int __init mvebu_gpio_init(void)
 736{
 737        return platform_driver_register(&mvebu_gpio_driver);
 738}
 739postcore_initcall(mvebu_gpio_init);
 740
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