drivers/pinctrl/sirf/pinctrl-sirf.c

   1 /*
   2  * pinmux driver for CSR SiRFprimaII
   3  *
   4  * Authors:
   5  *      Rongjun Ying <rongjun.ying@csr.com>
   6  *      Yuping Luo <yuping.luo@csr.com>
   7  *      Barry Song <baohua.song@csr.com>
   8  *
   9  * Copyright (c) 2011 - 2014 Cambridge Silicon Radio Limited, a CSR plc group
  10  * company.
  11  *
  12  * Licensed under GPLv2 or later.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/slab.h>
  20 #include <linux/err.h>
  21 #include <linux/pinctrl/pinctrl.h>
  22 #include <linux/pinctrl/pinmux.h>
  23 #include <linux/pinctrl/consumer.h>
  24 #include <linux/pinctrl/machine.h>
  25 #include <linux/of.h>
  26 #include <linux/of_address.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_platform.h>
  29 #include <linux/bitops.h>
  30 #include <linux/gpio.h>
  31 #include <linux/of_gpio.h>
  32
  33 #include "pinctrl-sirf.h"
  34
  35 #define DRIVER_NAME "pinmux-sirf"
  36
  37 struct sirfsoc_gpio_bank {
  38         int id;
  39         int parent_irq;
  40         spinlock_t lock;
  41 };
  42
  43 struct sirfsoc_gpio_chip {
  44         struct of_mm_gpio_chip chip;
  45         struct sirfsoc_gpio_bank sgpio_bank[SIRFSOC_GPIO_NO_OF_BANKS];
  46         spinlock_t lock;
  47 };
  48
  49 static struct sirfsoc_pin_group *sirfsoc_pin_groups;
  50 static int sirfsoc_pingrp_cnt;
  51
  52 static int sirfsoc_get_groups_count(struct pinctrl_dev *pctldev)
  53 {
  54         return sirfsoc_pingrp_cnt;
  55 }
  56
  57 static const char *sirfsoc_get_group_name(struct pinctrl_dev *pctldev,
  58                                        unsigned selector)
  59 {
  60         return sirfsoc_pin_groups[selector].name;
  61 }
  62
  63 static int sirfsoc_get_group_pins(struct pinctrl_dev *pctldev,
  64                                 unsigned selector,
  65                                 const unsigned **pins,
  66                                 unsigned *num_pins)
  67 {
  68         *pins = sirfsoc_pin_groups[selector].pins;
  69         *num_pins = sirfsoc_pin_groups[selector].num_pins;
  70         return 0;
  71 }
  72
  73 static void sirfsoc_pin_dbg_show(struct pinctrl_dev *pctldev,
  74                                 struct seq_file *s, unsigned offset)
  75 {
  76         seq_printf(s, " " DRIVER_NAME);
  77 }
  78
  79 static int sirfsoc_dt_node_to_map(struct pinctrl_dev *pctldev,
  80                                  struct device_node *np_config,
  81                                  struct pinctrl_map **map, unsigned *num_maps)
  82 {
  83         struct sirfsoc_pmx *spmx = pinctrl_dev_get_drvdata(pctldev);
  84         struct device_node *np;
  85         struct property *prop;
  86         const char *function, *group;
  87         int ret, index = 0, count = 0;
  88
  89         /* calculate number of maps required */
  90         for_each_child_of_node(np_config, np) {
  91                 ret = of_property_read_string(np, "sirf,function", &function);
  92                 if (ret < 0) {
  93                         of_node_put(np);
  94                         return ret;
  95                 }
  96
  97                 ret = of_property_count_strings(np, "sirf,pins");
  98                 if (ret < 0) {
  99                         of_node_put(np);
 100                         return ret;
 101                 }
 102
 103                 count += ret;
 104         }
 105
 106         if (!count) {
 107                 dev_err(spmx->dev, "No child nodes passed via DT\n");
 108                 return -ENODEV;
 109         }
 110
 111         *map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
 112         if (!*map)
 113                 return -ENOMEM;
 114
 115         for_each_child_of_node(np_config, np) {
 116                 of_property_read_string(np, "sirf,function", &function);
 117                 of_property_for_each_string(np, "sirf,pins", prop, group) {
 118                         (*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
 119                         (*map)[index].data.mux.group = group;
 120                         (*map)[index].data.mux.function = function;
 121                         index++;
 122                 }
 123         }
 124
 125         *num_maps = count;
 126
 127         return 0;
 128 }
 129
 130 static void sirfsoc_dt_free_map(struct pinctrl_dev *pctldev,
 131                 struct pinctrl_map *map, unsigned num_maps)
 132 {
 133         kfree(map);
 134 }
 135
 136 static struct pinctrl_ops sirfsoc_pctrl_ops = {
 137         .get_groups_count = sirfsoc_get_groups_count,
 138         .get_group_name = sirfsoc_get_group_name,
 139         .get_group_pins = sirfsoc_get_group_pins,
 140         .pin_dbg_show = sirfsoc_pin_dbg_show,
 141         .dt_node_to_map = sirfsoc_dt_node_to_map,
 142         .dt_free_map = sirfsoc_dt_free_map,
 143 };
 144
 145 static struct sirfsoc_pmx_func *sirfsoc_pmx_functions;
 146 static int sirfsoc_pmxfunc_cnt;
 147
 148 static void sirfsoc_pinmux_endisable(struct sirfsoc_pmx *spmx,
 149                                         unsigned selector, bool enable)
 150 {
 151         int i;
 152         const struct sirfsoc_padmux *mux =
 153                 sirfsoc_pmx_functions[selector].padmux;
 154         const struct sirfsoc_muxmask *mask = mux->muxmask;
 155
 156         for (i = 0; i < mux->muxmask_counts; i++) {
 157                 u32 muxval;
 158                 muxval = readl(spmx->gpio_virtbase +
 159                         SIRFSOC_GPIO_PAD_EN(mask[i].group));
 160                 if (enable)
 161                         muxval = muxval & ~mask[i].mask;
 162                 else
 163                         muxval = muxval | mask[i].mask;
 164                 writel(muxval, spmx->gpio_virtbase +
 165                         SIRFSOC_GPIO_PAD_EN(mask[i].group));
 166         }
 167
 168         if (mux->funcmask && enable) {
 169                 u32 func_en_val;
 170
 171                 func_en_val =
 172                         readl(spmx->rsc_virtbase + mux->ctrlreg);
 173                 func_en_val =
 174                         (func_en_val & ~mux->funcmask) | (mux->funcval);
 175                 writel(func_en_val, spmx->rsc_virtbase + mux->ctrlreg);
 176         }
 177 }
 178
 179 static int sirfsoc_pinmux_set_mux(struct pinctrl_dev *pmxdev,
 180                                 unsigned selector,
 181                                 unsigned group)
 182 {
 183         struct sirfsoc_pmx *spmx;
 184
 185         spmx = pinctrl_dev_get_drvdata(pmxdev);
 186         sirfsoc_pinmux_endisable(spmx, selector, true);
 187
 188         return 0;
 189 }
 190
 191 static int sirfsoc_pinmux_get_funcs_count(struct pinctrl_dev *pmxdev)
 192 {
 193         return sirfsoc_pmxfunc_cnt;
 194 }
 195
 196 static const char *sirfsoc_pinmux_get_func_name(struct pinctrl_dev *pctldev,
 197                                           unsigned selector)
 198 {
 199         return sirfsoc_pmx_functions[selector].name;
 200 }
 201
 202 static int sirfsoc_pinmux_get_groups(struct pinctrl_dev *pctldev,
 203                                 unsigned selector,
 204                                 const char * const **groups,
 205                                 unsigned * const num_groups)
 206 {
 207         *groups = sirfsoc_pmx_functions[selector].groups;
 208         *num_groups = sirfsoc_pmx_functions[selector].num_groups;
 209         return 0;
 210 }
 211
 212 static int sirfsoc_pinmux_request_gpio(struct pinctrl_dev *pmxdev,
 213         struct pinctrl_gpio_range *range, unsigned offset)
 214 {
 215         struct sirfsoc_pmx *spmx;
 216
 217         int group = range->id;
 218
 219         u32 muxval;
 220
 221         spmx = pinctrl_dev_get_drvdata(pmxdev);
 222
 223         muxval = readl(spmx->gpio_virtbase +
 224                 SIRFSOC_GPIO_PAD_EN(group));
 225         muxval = muxval | (1 << (offset - range->pin_base));
 226         writel(muxval, spmx->gpio_virtbase +
 227                 SIRFSOC_GPIO_PAD_EN(group));
 228
 229         return 0;
 230 }
 231
 232 static struct pinmux_ops sirfsoc_pinmux_ops = {
 233         .set_mux = sirfsoc_pinmux_set_mux,
 234         .get_functions_count = sirfsoc_pinmux_get_funcs_count,
 235         .get_function_name = sirfsoc_pinmux_get_func_name,
 236         .get_function_groups = sirfsoc_pinmux_get_groups,
 237         .gpio_request_enable = sirfsoc_pinmux_request_gpio,
 238 };
 239
 240 static struct pinctrl_desc sirfsoc_pinmux_desc = {
 241         .name = DRIVER_NAME,
 242         .pctlops = &sirfsoc_pctrl_ops,
 243         .pmxops = &sirfsoc_pinmux_ops,
 244         .owner = THIS_MODULE,
 245 };
 246
 247 static void __iomem *sirfsoc_rsc_of_iomap(void)
 248 {
 249         const struct of_device_id rsc_ids[]  = {
 250                 { .compatible = "sirf,prima2-rsc" },
 251                 {}
 252         };
 253         struct device_node *np;
 254
 255         np = of_find_matching_node(NULL, rsc_ids);
 256         if (!np)
 257                 panic("unable to find compatible rsc node in dtb\n");
 258
 259         return of_iomap(np, 0);
 260 }
 261
 262 static int sirfsoc_gpio_of_xlate(struct gpio_chip *gc,
 263         const struct of_phandle_args *gpiospec,
 264         u32 *flags)
 265 {
 266         if (gpiospec->args[0] > SIRFSOC_GPIO_NO_OF_BANKS * SIRFSOC_GPIO_BANK_SIZE)
 267                 return -EINVAL;
 268
 269         if (flags)
 270                 *flags = gpiospec->args[1];
 271
 272         return gpiospec->args[0];
 273 }
 274
 275 static const struct of_device_id pinmux_ids[] = {
 276         { .compatible = "sirf,prima2-pinctrl", .data = &prima2_pinctrl_data, },
 277         { .compatible = "sirf,atlas6-pinctrl", .data = &atlas6_pinctrl_data, },
 278         {}
 279 };
 280
 281 static int sirfsoc_pinmux_probe(struct platform_device *pdev)
 282 {
 283         int ret;
 284         struct sirfsoc_pmx *spmx;
 285         struct device_node *np = pdev->dev.of_node;
 286         const struct sirfsoc_pinctrl_data *pdata;
 287
 288         /* Create state holders etc for this driver */
 289         spmx = devm_kzalloc(&pdev->dev, sizeof(*spmx), GFP_KERNEL);
 290         if (!spmx)
 291                 return -ENOMEM;
 292
 293         spmx->dev = &pdev->dev;
 294
 295         platform_set_drvdata(pdev, spmx);
 296
 297         spmx->gpio_virtbase = of_iomap(np, 0);
 298         if (!spmx->gpio_virtbase) {
 299                 dev_err(&pdev->dev, "can't map gpio registers\n");
 300                 return -ENOMEM;
 301         }
 302
 303         spmx->rsc_virtbase = sirfsoc_rsc_of_iomap();
 304         if (!spmx->rsc_virtbase) {
 305                 ret = -ENOMEM;
 306                 dev_err(&pdev->dev, "can't map rsc registers\n");
 307                 goto out_no_rsc_remap;
 308         }
 309
 310         pdata = of_match_node(pinmux_ids, np)->data;
 311         sirfsoc_pin_groups = pdata->grps;
 312         sirfsoc_pingrp_cnt = pdata->grps_cnt;
 313         sirfsoc_pmx_functions = pdata->funcs;
 314         sirfsoc_pmxfunc_cnt = pdata->funcs_cnt;
 315         sirfsoc_pinmux_desc.pins = pdata->pads;
 316         sirfsoc_pinmux_desc.npins = pdata->pads_cnt;
 317
 318
 319         /* Now register the pin controller and all pins it handles */
 320         spmx->pmx = pinctrl_register(&sirfsoc_pinmux_desc, &pdev->dev, spmx);
 321         if (IS_ERR(spmx->pmx)) {
 322                 dev_err(&pdev->dev, "could not register SIRFSOC pinmux driver\n");
 323                 ret = PTR_ERR(spmx->pmx);
 324                 goto out_no_pmx;
 325         }
 326
 327         dev_info(&pdev->dev, "initialized SIRFSOC pinmux driver\n");
 328
 329         return 0;
 330
 331 out_no_pmx:
 332         iounmap(spmx->rsc_virtbase);
 333 out_no_rsc_remap:
 334         iounmap(spmx->gpio_virtbase);
 335         return ret;
 336 }
 337
 338 #ifdef CONFIG_PM_SLEEP
 339 static int sirfsoc_pinmux_suspend_noirq(struct device *dev)
 340 {
 341         int i, j;
 342         struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
 343
 344         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 345                 for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
 346                         spmx->gpio_regs[i][j] = readl(spmx->gpio_virtbase +
 347                                 SIRFSOC_GPIO_CTRL(i, j));
 348                 }
 349                 spmx->ints_regs[i] = readl(spmx->gpio_virtbase +
 350                         SIRFSOC_GPIO_INT_STATUS(i));
 351                 spmx->paden_regs[i] = readl(spmx->gpio_virtbase +
 352                         SIRFSOC_GPIO_PAD_EN(i));
 353         }
 354         spmx->dspen_regs = readl(spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
 355
 356         for (i = 0; i < 3; i++)
 357                 spmx->rsc_regs[i] = readl(spmx->rsc_virtbase + 4 * i);
 358
 359         return 0;
 360 }
 361
 362 static int sirfsoc_pinmux_resume_noirq(struct device *dev)
 363 {
 364         int i, j;
 365         struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
 366
 367         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 368                 for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
 369                         writel(spmx->gpio_regs[i][j], spmx->gpio_virtbase +
 370                                 SIRFSOC_GPIO_CTRL(i, j));
 371                 }
 372                 writel(spmx->ints_regs[i], spmx->gpio_virtbase +
 373                         SIRFSOC_GPIO_INT_STATUS(i));
 374                 writel(spmx->paden_regs[i], spmx->gpio_virtbase +
 375                         SIRFSOC_GPIO_PAD_EN(i));
 376         }
 377         writel(spmx->dspen_regs, spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
 378
 379         for (i = 0; i < 3; i++)
 380                 writel(spmx->rsc_regs[i], spmx->rsc_virtbase + 4 * i);
 381
 382         return 0;
 383 }
 384
 385 static const struct dev_pm_ops sirfsoc_pinmux_pm_ops = {
 386         .suspend_noirq = sirfsoc_pinmux_suspend_noirq,
 387         .resume_noirq = sirfsoc_pinmux_resume_noirq,
 388         .freeze_noirq = sirfsoc_pinmux_suspend_noirq,
 389         .restore_noirq = sirfsoc_pinmux_resume_noirq,
 390 };
 391 #endif
 392
 393 static struct platform_driver sirfsoc_pinmux_driver = {
 394         .driver = {
 395                 .name = DRIVER_NAME,
 396                 .of_match_table = pinmux_ids,
 397 #ifdef CONFIG_PM_SLEEP
 398                 .pm = &sirfsoc_pinmux_pm_ops,
 399 #endif
 400         },
 401         .probe = sirfsoc_pinmux_probe,
 402 };
 403
 404 static int __init sirfsoc_pinmux_init(void)
 405 {
 406         return platform_driver_register(&sirfsoc_pinmux_driver);
 407 }
 408 arch_initcall(sirfsoc_pinmux_init);
 409
 410 static inline struct sirfsoc_gpio_bank *
 411 sirfsoc_gpio_to_bank(struct sirfsoc_gpio_chip *sgpio, unsigned int offset)
 412 {
 413         return &sgpio->sgpio_bank[offset / SIRFSOC_GPIO_BANK_SIZE];
 414 }
 415
 416 static inline int sirfsoc_gpio_to_bankoff(unsigned int offset)
 417 {
 418         return offset % SIRFSOC_GPIO_BANK_SIZE;
 419 }
 420
 421 static void sirfsoc_gpio_irq_ack(struct irq_data *d)
 422 {
 423         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 424         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
 425         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
 426         int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
 427         u32 val, offset;
 428         unsigned long flags;
 429
 430         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 431
 432         spin_lock_irqsave(&sgpio->lock, flags);
 433
 434         val = readl(sgpio->chip.regs + offset);
 435
 436         writel(val, sgpio->chip.regs + offset);
 437
 438         spin_unlock_irqrestore(&sgpio->lock, flags);
 439 }
 440
 441 static void __sirfsoc_gpio_irq_mask(struct sirfsoc_gpio_chip *sgpio,
 442                                     struct sirfsoc_gpio_bank *bank,
 443                                     int idx)
 444 {
 445         u32 val, offset;
 446         unsigned long flags;
 447
 448         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 449
 450         spin_lock_irqsave(&sgpio->lock, flags);
 451
 452         val = readl(sgpio->chip.regs + offset);
 453         val &= ~SIRFSOC_GPIO_CTL_INTR_EN_MASK;
 454         val &= ~SIRFSOC_GPIO_CTL_INTR_STS_MASK;
 455         writel(val, sgpio->chip.regs + offset);
 456
 457         spin_unlock_irqrestore(&sgpio->lock, flags);
 458 }
 459
 460 static void sirfsoc_gpio_irq_mask(struct irq_data *d)
 461 {
 462         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 463         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
 464         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
 465
 466         __sirfsoc_gpio_irq_mask(sgpio, bank, d->hwirq % SIRFSOC_GPIO_BANK_SIZE);
 467 }
 468
 469 static void sirfsoc_gpio_irq_unmask(struct irq_data *d)
 470 {
 471         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 472         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
 473         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
 474         int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
 475         u32 val, offset;
 476         unsigned long flags;
 477
 478         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 479
 480         spin_lock_irqsave(&sgpio->lock, flags);
 481
 482         val = readl(sgpio->chip.regs + offset);
 483         val &= ~SIRFSOC_GPIO_CTL_INTR_STS_MASK;
 484         val |= SIRFSOC_GPIO_CTL_INTR_EN_MASK;
 485         writel(val, sgpio->chip.regs + offset);
 486
 487         spin_unlock_irqrestore(&sgpio->lock, flags);
 488 }
 489
 490 static int sirfsoc_gpio_irq_type(struct irq_data *d, unsigned type)
 491 {
 492         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 493         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
 494         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, d->hwirq);
 495         int idx = sirfsoc_gpio_to_bankoff(d->hwirq);
 496         u32 val, offset;
 497         unsigned long flags;
 498
 499         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 500
 501         spin_lock_irqsave(&sgpio->lock, flags);
 502
 503         val = readl(sgpio->chip.regs + offset);
 504         val &= ~(SIRFSOC_GPIO_CTL_INTR_STS_MASK | SIRFSOC_GPIO_CTL_OUT_EN_MASK);
 505
 506         switch (type) {
 507         case IRQ_TYPE_NONE:
 508                 break;
 509         case IRQ_TYPE_EDGE_RISING:
 510                 val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
 511                         SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
 512                 val &= ~SIRFSOC_GPIO_CTL_INTR_LOW_MASK;
 513                 break;
 514         case IRQ_TYPE_EDGE_FALLING:
 515                 val &= ~SIRFSOC_GPIO_CTL_INTR_HIGH_MASK;
 516                 val |= SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
 517                         SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
 518                 break;
 519         case IRQ_TYPE_EDGE_BOTH:
 520                 val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
 521                         SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
 522                         SIRFSOC_GPIO_CTL_INTR_TYPE_MASK;
 523                 break;
 524         case IRQ_TYPE_LEVEL_LOW:
 525                 val &= ~(SIRFSOC_GPIO_CTL_INTR_HIGH_MASK |
 526                         SIRFSOC_GPIO_CTL_INTR_TYPE_MASK);
 527                 val |= SIRFSOC_GPIO_CTL_INTR_LOW_MASK;
 528                 break;
 529         case IRQ_TYPE_LEVEL_HIGH:
 530                 val |= SIRFSOC_GPIO_CTL_INTR_HIGH_MASK;
 531                 val &= ~(SIRFSOC_GPIO_CTL_INTR_LOW_MASK |
 532                         SIRFSOC_GPIO_CTL_INTR_TYPE_MASK);
 533                 break;
 534         }
 535
 536         writel(val, sgpio->chip.regs + offset);
 537
 538         spin_unlock_irqrestore(&sgpio->lock, flags);
 539
 540         return 0;
 541 }
 542
 543 static struct irq_chip sirfsoc_irq_chip = {
 544         .name = "sirf-gpio-irq",
 545         .irq_ack = sirfsoc_gpio_irq_ack,
 546         .irq_mask = sirfsoc_gpio_irq_mask,
 547         .irq_unmask = sirfsoc_gpio_irq_unmask,
 548         .irq_set_type = sirfsoc_gpio_irq_type,
 549 };
 550
 551 static void sirfsoc_gpio_handle_irq(struct irq_desc *desc)
 552 {
 553         unsigned int irq = irq_desc_get_irq(desc);
 554         struct gpio_chip *gc = irq_desc_get_handler_data(desc);
 555         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(gc);
 556         struct sirfsoc_gpio_bank *bank;
 557         u32 status, ctrl;
 558         int idx = 0;
 559         struct irq_chip *chip = irq_desc_get_chip(desc);
 560         int i;
 561
 562         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 563                 bank = &sgpio->sgpio_bank[i];
 564                 if (bank->parent_irq == irq)
 565                         break;
 566         }
 567         BUG_ON(i == SIRFSOC_GPIO_NO_OF_BANKS);
 568
 569         chained_irq_enter(chip, desc);
 570
 571         status = readl(sgpio->chip.regs + SIRFSOC_GPIO_INT_STATUS(bank->id));
 572         if (!status) {
 573                 printk(KERN_WARNING
 574                         "%s: gpio id %d status %#x no interrupt is flagged\n",
 575                         __func__, bank->id, status);
 576                 handle_bad_irq(desc);
 577                 return;
 578         }
 579
 580         while (status) {
 581                 ctrl = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, idx));
 582
 583                 /*
 584                  * Here we must check whether the corresponding GPIO's interrupt
 585                  * has been enabled, otherwise just skip it
 586                  */
 587                 if ((status & 0x1) && (ctrl & SIRFSOC_GPIO_CTL_INTR_EN_MASK)) {
 588                         pr_debug("%s: gpio id %d idx %d happens\n",
 589                                 __func__, bank->id, idx);
 590                         generic_handle_irq(irq_find_mapping(gc->irqdomain, idx +
 591                                         bank->id * SIRFSOC_GPIO_BANK_SIZE));
 592                 }
 593
 594                 idx++;
 595                 status = status >> 1;
 596         }
 597
 598         chained_irq_exit(chip, desc);
 599 }
 600
 601 static inline void sirfsoc_gpio_set_input(struct sirfsoc_gpio_chip *sgpio,
 602                                           unsigned ctrl_offset)
 603 {
 604         u32 val;
 605
 606         val = readl(sgpio->chip.regs + ctrl_offset);
 607         val &= ~SIRFSOC_GPIO_CTL_OUT_EN_MASK;
 608         writel(val, sgpio->chip.regs + ctrl_offset);
 609 }
 610
 611 static int sirfsoc_gpio_request(struct gpio_chip *chip, unsigned offset)
 612 {
 613         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 614         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
 615         unsigned long flags;
 616
 617         if (pinctrl_request_gpio(chip->base + offset))
 618                 return -ENODEV;
 619
 620         spin_lock_irqsave(&bank->lock, flags);
 621
 622         /*
 623          * default status:
 624          * set direction as input and mask irq
 625          */
 626         sirfsoc_gpio_set_input(sgpio, SIRFSOC_GPIO_CTRL(bank->id, offset));
 627         __sirfsoc_gpio_irq_mask(sgpio, bank, offset);
 628
 629         spin_unlock_irqrestore(&bank->lock, flags);
 630
 631         return 0;
 632 }
 633
 634 static void sirfsoc_gpio_free(struct gpio_chip *chip, unsigned offset)
 635 {
 636         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 637         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
 638         unsigned long flags;
 639
 640         spin_lock_irqsave(&bank->lock, flags);
 641
 642         __sirfsoc_gpio_irq_mask(sgpio, bank, offset);
 643         sirfsoc_gpio_set_input(sgpio, SIRFSOC_GPIO_CTRL(bank->id, offset));
 644
 645         spin_unlock_irqrestore(&bank->lock, flags);
 646
 647         pinctrl_free_gpio(chip->base + offset);
 648 }
 649
 650 static int sirfsoc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 651 {
 652         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 653         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, gpio);
 654         int idx = sirfsoc_gpio_to_bankoff(gpio);
 655         unsigned long flags;
 656         unsigned offset;
 657
 658         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 659
 660         spin_lock_irqsave(&bank->lock, flags);
 661
 662         sirfsoc_gpio_set_input(sgpio, offset);
 663
 664         spin_unlock_irqrestore(&bank->lock, flags);
 665
 666         return 0;
 667 }
 668
 669 static inline void sirfsoc_gpio_set_output(struct sirfsoc_gpio_chip *sgpio,
 670                                            struct sirfsoc_gpio_bank *bank,
 671                                            unsigned offset,
 672                                            int value)
 673 {
 674         u32 out_ctrl;
 675         unsigned long flags;
 676
 677         spin_lock_irqsave(&bank->lock, flags);
 678
 679         out_ctrl = readl(sgpio->chip.regs + offset);
 680         if (value)
 681                 out_ctrl |= SIRFSOC_GPIO_CTL_DATAOUT_MASK;
 682         else
 683                 out_ctrl &= ~SIRFSOC_GPIO_CTL_DATAOUT_MASK;
 684
 685         out_ctrl &= ~SIRFSOC_GPIO_CTL_INTR_EN_MASK;
 686         out_ctrl |= SIRFSOC_GPIO_CTL_OUT_EN_MASK;
 687         writel(out_ctrl, sgpio->chip.regs + offset);
 688
 689         spin_unlock_irqrestore(&bank->lock, flags);
 690 }
 691
 692 static int sirfsoc_gpio_direction_output(struct gpio_chip *chip,
 693         unsigned gpio, int value)
 694 {
 695         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 696         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, gpio);
 697         int idx = sirfsoc_gpio_to_bankoff(gpio);
 698         u32 offset;
 699         unsigned long flags;
 700
 701         offset = SIRFSOC_GPIO_CTRL(bank->id, idx);
 702
 703         spin_lock_irqsave(&sgpio->lock, flags);
 704
 705         sirfsoc_gpio_set_output(sgpio, bank, offset, value);
 706
 707         spin_unlock_irqrestore(&sgpio->lock, flags);
 708
 709         return 0;
 710 }
 711
 712 static int sirfsoc_gpio_get_value(struct gpio_chip *chip, unsigned offset)
 713 {
 714         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 715         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
 716         u32 val;
 717         unsigned long flags;
 718
 719         spin_lock_irqsave(&bank->lock, flags);
 720
 721         val = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
 722
 723         spin_unlock_irqrestore(&bank->lock, flags);
 724
 725         return !!(val & SIRFSOC_GPIO_CTL_DATAIN_MASK);
 726 }
 727
 728 static void sirfsoc_gpio_set_value(struct gpio_chip *chip, unsigned offset,
 729         int value)
 730 {
 731         struct sirfsoc_gpio_chip *sgpio = gpiochip_get_data(chip);
 732         struct sirfsoc_gpio_bank *bank = sirfsoc_gpio_to_bank(sgpio, offset);
 733         u32 ctrl;
 734         unsigned long flags;
 735
 736         spin_lock_irqsave(&bank->lock, flags);
 737
 738         ctrl = readl(sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
 739         if (value)
 740                 ctrl |= SIRFSOC_GPIO_CTL_DATAOUT_MASK;
 741         else
 742                 ctrl &= ~SIRFSOC_GPIO_CTL_DATAOUT_MASK;
 743         writel(ctrl, sgpio->chip.regs + SIRFSOC_GPIO_CTRL(bank->id, offset));
 744
 745         spin_unlock_irqrestore(&bank->lock, flags);
 746 }
 747
 748 static void sirfsoc_gpio_set_pullup(struct sirfsoc_gpio_chip *sgpio,
 749                                     const u32 *pullups)
 750 {
 751         int i, n;
 752         const unsigned long *p = (const unsigned long *)pullups;
 753
 754         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 755                 for_each_set_bit(n, p + i, BITS_PER_LONG) {
 756                         u32 offset = SIRFSOC_GPIO_CTRL(i, n);
 757                         u32 val = readl(sgpio->chip.regs + offset);
 758                         val |= SIRFSOC_GPIO_CTL_PULL_MASK;
 759                         val |= SIRFSOC_GPIO_CTL_PULL_HIGH;
 760                         writel(val, sgpio->chip.regs + offset);
 761                 }
 762         }
 763 }
 764
 765 static void sirfsoc_gpio_set_pulldown(struct sirfsoc_gpio_chip *sgpio,
 766                                       const u32 *pulldowns)
 767 {
 768         int i, n;
 769         const unsigned long *p = (const unsigned long *)pulldowns;
 770
 771         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 772                 for_each_set_bit(n, p + i, BITS_PER_LONG) {
 773                         u32 offset = SIRFSOC_GPIO_CTRL(i, n);
 774                         u32 val = readl(sgpio->chip.regs + offset);
 775                         val |= SIRFSOC_GPIO_CTL_PULL_MASK;
 776                         val &= ~SIRFSOC_GPIO_CTL_PULL_HIGH;
 777                         writel(val, sgpio->chip.regs + offset);
 778                 }
 779         }
 780 }
 781
 782 static int sirfsoc_gpio_probe(struct device_node *np)
 783 {
 784         int i, err = 0;
 785         static struct sirfsoc_gpio_chip *sgpio;
 786         struct sirfsoc_gpio_bank *bank;
 787         void __iomem *regs;
 788         struct platform_device *pdev;
 789
 790         u32 pullups[SIRFSOC_GPIO_NO_OF_BANKS], pulldowns[SIRFSOC_GPIO_NO_OF_BANKS];
 791
 792         pdev = of_find_device_by_node(np);
 793         if (!pdev)
 794                 return -ENODEV;
 795
 796         sgpio = devm_kzalloc(&pdev->dev, sizeof(*sgpio), GFP_KERNEL);
 797         if (!sgpio)
 798                 return -ENOMEM;
 799         spin_lock_init(&sgpio->lock);
 800
 801         regs = of_iomap(np, 0);
 802         if (!regs)
 803                 return -ENOMEM;
 804
 805         sgpio->chip.gc.request = sirfsoc_gpio_request;
 806         sgpio->chip.gc.free = sirfsoc_gpio_free;
 807         sgpio->chip.gc.direction_input = sirfsoc_gpio_direction_input;
 808         sgpio->chip.gc.get = sirfsoc_gpio_get_value;
 809         sgpio->chip.gc.direction_output = sirfsoc_gpio_direction_output;
 810         sgpio->chip.gc.set = sirfsoc_gpio_set_value;
 811         sgpio->chip.gc.base = 0;
 812         sgpio->chip.gc.ngpio = SIRFSOC_GPIO_BANK_SIZE * SIRFSOC_GPIO_NO_OF_BANKS;
 813         sgpio->chip.gc.label = kstrdup(np->full_name, GFP_KERNEL);
 814         sgpio->chip.gc.of_node = np;
 815         sgpio->chip.gc.of_xlate = sirfsoc_gpio_of_xlate;
 816         sgpio->chip.gc.of_gpio_n_cells = 2;
 817         sgpio->chip.gc.parent = &pdev->dev;
 818         sgpio->chip.regs = regs;
 819
 820         err = gpiochip_add_data(&sgpio->chip.gc, sgpio);
 821         if (err) {
 822                 dev_err(&pdev->dev, "%s: error in probe function with status %d\n",
 823                         np->full_name, err);
 824                 goto out;
 825         }
 826
 827         err =  gpiochip_irqchip_add(&sgpio->chip.gc,
 828                 &sirfsoc_irq_chip,
 829                 0, handle_level_irq,
 830                 IRQ_TYPE_NONE);
 831         if (err) {
 832                 dev_err(&pdev->dev,
 833                         "could not connect irqchip to gpiochip\n");
 834                 goto out_banks;
 835         }
 836
 837         for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
 838                 bank = &sgpio->sgpio_bank[i];
 839                 spin_lock_init(&bank->lock);
 840                 bank->parent_irq = platform_get_irq(pdev, i);
 841                 if (bank->parent_irq < 0) {
 842                         err = bank->parent_irq;
 843                         goto out_banks;
 844                 }
 845
 846                 gpiochip_set_chained_irqchip(&sgpio->chip.gc,
 847                         &sirfsoc_irq_chip,
 848                         bank->parent_irq,
 849                         sirfsoc_gpio_handle_irq);
 850         }
 851
 852         err = gpiochip_add_pin_range(&sgpio->chip.gc, dev_name(&pdev->dev),
 853                 0, 0, SIRFSOC_GPIO_BANK_SIZE * SIRFSOC_GPIO_NO_OF_BANKS);
 854         if (err) {
 855                 dev_err(&pdev->dev,
 856                         "could not add gpiochip pin range\n");
 857                 goto out_no_range;
 858         }
 859
 860         if (!of_property_read_u32_array(np, "sirf,pullups", pullups,
 861                 SIRFSOC_GPIO_NO_OF_BANKS))
 862                 sirfsoc_gpio_set_pullup(sgpio, pullups);
 863
 864         if (!of_property_read_u32_array(np, "sirf,pulldowns", pulldowns,
 865                 SIRFSOC_GPIO_NO_OF_BANKS))
 866                 sirfsoc_gpio_set_pulldown(sgpio, pulldowns);
 867
 868         return 0;
 869
 870 out_no_range:
 871 out_banks:
 872         gpiochip_remove(&sgpio->chip.gc);
 873 out:
 874         iounmap(regs);
 875         return err;
 876 }
 877
 878 static int __init sirfsoc_gpio_init(void)
 879 {
 880
 881         struct device_node *np;
 882
 883         np = of_find_matching_node(NULL, pinmux_ids);
 884
 885         if (!np)
 886                 return -ENODEV;
 887
 888         return sirfsoc_gpio_probe(np);
 889 }
 890 subsys_initcall(sirfsoc_gpio_init);