drivers/mfd/pm8921-core.c

   1 /*
   2  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #define pr_fmt(fmt) "%s: " fmt, __func__
  15
  16 #include <linux/kernel.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/irqchip/chained_irq.h>
  19 #include <linux/irq.h>
  20 #include <linux/irqdomain.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/err.h>
  25 #include <linux/ssbi.h>
  26 #include <linux/regmap.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/mfd/core.h>
  29
  30 #define SSBI_REG_ADDR_IRQ_BASE          0x1BB
  31
  32 #define SSBI_REG_ADDR_IRQ_ROOT          (SSBI_REG_ADDR_IRQ_BASE + 0)
  33 #define SSBI_REG_ADDR_IRQ_M_STATUS1     (SSBI_REG_ADDR_IRQ_BASE + 1)
  34 #define SSBI_REG_ADDR_IRQ_M_STATUS2     (SSBI_REG_ADDR_IRQ_BASE + 2)
  35 #define SSBI_REG_ADDR_IRQ_M_STATUS3     (SSBI_REG_ADDR_IRQ_BASE + 3)
  36 #define SSBI_REG_ADDR_IRQ_M_STATUS4     (SSBI_REG_ADDR_IRQ_BASE + 4)
  37 #define SSBI_REG_ADDR_IRQ_BLK_SEL       (SSBI_REG_ADDR_IRQ_BASE + 5)
  38 #define SSBI_REG_ADDR_IRQ_IT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 6)
  39 #define SSBI_REG_ADDR_IRQ_CONFIG        (SSBI_REG_ADDR_IRQ_BASE + 7)
  40 #define SSBI_REG_ADDR_IRQ_RT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 8)
  41
  42 #define PM_IRQF_LVL_SEL                 0x01    /* level select */
  43 #define PM_IRQF_MASK_FE                 0x02    /* mask falling edge */
  44 #define PM_IRQF_MASK_RE                 0x04    /* mask rising edge */
  45 #define PM_IRQF_CLR                     0x08    /* clear interrupt */
  46 #define PM_IRQF_BITS_MASK               0x70
  47 #define PM_IRQF_BITS_SHIFT              4
  48 #define PM_IRQF_WRITE                   0x80
  49
  50 #define PM_IRQF_MASK_ALL                (PM_IRQF_MASK_FE | \
  51                                         PM_IRQF_MASK_RE)
  52
  53 #define REG_HWREV               0x002  /* PMIC4 revision */
  54 #define REG_HWREV_2             0x0E8  /* PMIC4 revision 2 */
  55
  56 #define PM8921_NR_IRQS          256
  57
  58 struct pm_irq_chip {
  59         struct regmap           *regmap;
  60         spinlock_t              pm_irq_lock;
  61         struct irq_domain       *irqdomain;
  62         unsigned int            num_irqs;
  63         unsigned int            num_blocks;
  64         unsigned int            num_masters;
  65         u8                      config[0];
  66 };
  67
  68 static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, unsigned int bp,
  69                                  unsigned int *ip)
  70 {
  71         int     rc;
  72
  73         spin_lock(&chip->pm_irq_lock);
  74         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
  75         if (rc) {
  76                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
  77                 goto bail;
  78         }
  79
  80         rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
  81         if (rc)
  82                 pr_err("Failed Reading Status rc=%d\n", rc);
  83 bail:
  84         spin_unlock(&chip->pm_irq_lock);
  85         return rc;
  86 }
  87
  88 static int
  89 pm8xxx_config_irq(struct pm_irq_chip *chip, unsigned int bp, unsigned int cp)
  90 {
  91         int     rc;
  92
  93         spin_lock(&chip->pm_irq_lock);
  94         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
  95         if (rc) {
  96                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
  97                 goto bail;
  98         }
  99
 100         cp |= PM_IRQF_WRITE;
 101         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_CONFIG, cp);
 102         if (rc)
 103                 pr_err("Failed Configuring IRQ rc=%d\n", rc);
 104 bail:
 105         spin_unlock(&chip->pm_irq_lock);
 106         return rc;
 107 }
 108
 109 static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
 110 {
 111         int pmirq, irq, i, ret = 0;
 112         unsigned int bits;
 113
 114         ret = pm8xxx_read_block_irq(chip, block, &bits);
 115         if (ret) {
 116                 pr_err("Failed reading %d block ret=%d", block, ret);
 117                 return ret;
 118         }
 119         if (!bits) {
 120                 pr_err("block bit set in master but no irqs: %d", block);
 121                 return 0;
 122         }
 123
 124         /* Check IRQ bits */
 125         for (i = 0; i < 8; i++) {
 126                 if (bits & (1 << i)) {
 127                         pmirq = block * 8 + i;
 128                         irq = irq_find_mapping(chip->irqdomain, pmirq);
 129                         generic_handle_irq(irq);
 130                 }
 131         }
 132         return 0;
 133 }
 134
 135 static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
 136 {
 137         unsigned int blockbits;
 138         int block_number, i, ret = 0;
 139
 140         ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_M_STATUS1 + master,
 141                           &blockbits);
 142         if (ret) {
 143                 pr_err("Failed to read master %d ret=%d\n", master, ret);
 144                 return ret;
 145         }
 146         if (!blockbits) {
 147                 pr_err("master bit set in root but no blocks: %d", master);
 148                 return 0;
 149         }
 150
 151         for (i = 0; i < 8; i++)
 152                 if (blockbits & (1 << i)) {
 153                         block_number = master * 8 + i;  /* block # */
 154                         ret |= pm8xxx_irq_block_handler(chip, block_number);
 155                 }
 156         return ret;
 157 }
 158
 159 static void pm8xxx_irq_handler(struct irq_desc *desc)
 160 {
 161         struct pm_irq_chip *chip = irq_desc_get_handler_data(desc);
 162         struct irq_chip *irq_chip = irq_desc_get_chip(desc);
 163         unsigned int root;
 164         int     i, ret, masters = 0;
 165
 166         chained_irq_enter(irq_chip, desc);
 167
 168         ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_ROOT, &root);
 169         if (ret) {
 170                 pr_err("Can't read root status ret=%d\n", ret);
 171                 return;
 172         }
 173
 174         /* on pm8xxx series masters start from bit 1 of the root */
 175         masters = root >> 1;
 176
 177         /* Read allowed masters for blocks. */
 178         for (i = 0; i < chip->num_masters; i++)
 179                 if (masters & (1 << i))
 180                         pm8xxx_irq_master_handler(chip, i);
 181
 182         chained_irq_exit(irq_chip, desc);
 183 }
 184
 185 static void pm8xxx_irq_mask_ack(struct irq_data *d)
 186 {
 187         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 188         unsigned int pmirq = irqd_to_hwirq(d);
 189         u8      block, config;
 190
 191         block = pmirq / 8;
 192
 193         config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
 194         pm8xxx_config_irq(chip, block, config);
 195 }
 196
 197 static void pm8xxx_irq_unmask(struct irq_data *d)
 198 {
 199         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 200         unsigned int pmirq = irqd_to_hwirq(d);
 201         u8      block, config;
 202
 203         block = pmirq / 8;
 204
 205         config = chip->config[pmirq];
 206         pm8xxx_config_irq(chip, block, config);
 207 }
 208
 209 static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
 210 {
 211         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 212         unsigned int pmirq = irqd_to_hwirq(d);
 213         int irq_bit;
 214         u8 block, config;
 215
 216         block = pmirq / 8;
 217         irq_bit  = pmirq % 8;
 218
 219         chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
 220                                                         | PM_IRQF_MASK_ALL;
 221         if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
 222                 if (flow_type & IRQF_TRIGGER_RISING)
 223                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
 224                 if (flow_type & IRQF_TRIGGER_FALLING)
 225                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
 226         } else {
 227                 chip->config[pmirq] |= PM_IRQF_LVL_SEL;
 228
 229                 if (flow_type & IRQF_TRIGGER_HIGH)
 230                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
 231                 else
 232                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
 233         }
 234
 235         config = chip->config[pmirq] | PM_IRQF_CLR;
 236         return pm8xxx_config_irq(chip, block, config);
 237 }
 238
 239 static int pm8xxx_irq_get_irqchip_state(struct irq_data *d,
 240                                         enum irqchip_irq_state which,
 241                                         bool *state)
 242 {
 243         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 244         unsigned int pmirq = irqd_to_hwirq(d);
 245         unsigned int bits;
 246         int irq_bit;
 247         u8 block;
 248         int rc;
 249
 250         if (which != IRQCHIP_STATE_LINE_LEVEL)
 251                 return -EINVAL;
 252
 253         block = pmirq / 8;
 254         irq_bit = pmirq % 8;
 255
 256         spin_lock(&chip->pm_irq_lock);
 257         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
 258         if (rc) {
 259                 pr_err("Failed Selecting Block %d rc=%d\n", block, rc);
 260                 goto bail;
 261         }
 262
 263         rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
 264         if (rc) {
 265                 pr_err("Failed Reading Status rc=%d\n", rc);
 266                 goto bail;
 267         }
 268
 269         *state = !!(bits & BIT(irq_bit));
 270 bail:
 271         spin_unlock(&chip->pm_irq_lock);
 272
 273         return rc;
 274 }
 275
 276 static struct irq_chip pm8xxx_irq_chip = {
 277         .name           = "pm8xxx",
 278         .irq_mask_ack   = pm8xxx_irq_mask_ack,
 279         .irq_unmask     = pm8xxx_irq_unmask,
 280         .irq_set_type   = pm8xxx_irq_set_type,
 281         .irq_get_irqchip_state = pm8xxx_irq_get_irqchip_state,
 282         .flags          = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
 283 };
 284
 285 static int pm8xxx_irq_domain_map(struct irq_domain *d, unsigned int irq,
 286                                    irq_hw_number_t hwirq)
 287 {
 288         struct pm_irq_chip *chip = d->host_data;
 289
 290         irq_set_chip_and_handler(irq, &pm8xxx_irq_chip, handle_level_irq);
 291         irq_set_chip_data(irq, chip);
 292         irq_set_noprobe(irq);
 293
 294         return 0;
 295 }
 296
 297 static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
 298         .xlate = irq_domain_xlate_twocell,
 299         .map = pm8xxx_irq_domain_map,
 300 };
 301
 302 static const struct regmap_config ssbi_regmap_config = {
 303         .reg_bits = 16,
 304         .val_bits = 8,
 305         .max_register = 0x3ff,
 306         .fast_io = true,
 307         .reg_read = ssbi_reg_read,
 308         .reg_write = ssbi_reg_write
 309 };
 310
 311 static const struct of_device_id pm8921_id_table[] = {
 312         { .compatible = "qcom,pm8058", },
 313         { .compatible = "qcom,pm8921", },
 314         { }
 315 };
 316 MODULE_DEVICE_TABLE(of, pm8921_id_table);
 317
 318 static int pm8921_probe(struct platform_device *pdev)
 319 {
 320         struct regmap *regmap;
 321         int irq, rc;
 322         unsigned int val;
 323         u32 rev;
 324         struct pm_irq_chip *chip;
 325         unsigned int nirqs = PM8921_NR_IRQS;
 326
 327         irq = platform_get_irq(pdev, 0);
 328         if (irq < 0)
 329                 return irq;
 330
 331         regmap = devm_regmap_init(&pdev->dev, NULL, pdev->dev.parent,
 332                                   &ssbi_regmap_config);
 333         if (IS_ERR(regmap))
 334                 return PTR_ERR(regmap);
 335
 336         /* Read PMIC chip revision */
 337         rc = regmap_read(regmap, REG_HWREV, &val);
 338         if (rc) {
 339                 pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
 340                 return rc;
 341         }
 342         pr_info("PMIC revision 1: %02X\n", val);
 343         rev = val;
 344
 345         /* Read PMIC chip revision 2 */
 346         rc = regmap_read(regmap, REG_HWREV_2, &val);
 347         if (rc) {
 348                 pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
 349                         REG_HWREV_2, rc);
 350                 return rc;
 351         }
 352         pr_info("PMIC revision 2: %02X\n", val);
 353         rev |= val << BITS_PER_BYTE;
 354
 355         chip = devm_kzalloc(&pdev->dev, sizeof(*chip) +
 356                                         sizeof(chip->config[0]) * nirqs,
 357                                         GFP_KERNEL);
 358         if (!chip)
 359                 return -ENOMEM;
 360
 361         platform_set_drvdata(pdev, chip);
 362         chip->regmap = regmap;
 363         chip->num_irqs = nirqs;
 364         chip->num_blocks = DIV_ROUND_UP(chip->num_irqs, 8);
 365         chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
 366         spin_lock_init(&chip->pm_irq_lock);
 367
 368         chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node, nirqs,
 369                                                 &pm8xxx_irq_domain_ops,
 370                                                 chip);
 371         if (!chip->irqdomain)
 372                 return -ENODEV;
 373
 374         irq_set_chained_handler_and_data(irq, pm8xxx_irq_handler, chip);
 375         irq_set_irq_wake(irq, 1);
 376
 377         rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 378         if (rc) {
 379                 irq_set_chained_handler_and_data(irq, NULL, NULL);
 380                 irq_domain_remove(chip->irqdomain);
 381         }
 382
 383         return rc;
 384 }
 385
 386 static int pm8921_remove_child(struct device *dev, void *unused)
 387 {
 388         platform_device_unregister(to_platform_device(dev));
 389         return 0;
 390 }
 391
 392 static int pm8921_remove(struct platform_device *pdev)
 393 {
 394         int irq = platform_get_irq(pdev, 0);
 395         struct pm_irq_chip *chip = platform_get_drvdata(pdev);
 396
 397         device_for_each_child(&pdev->dev, NULL, pm8921_remove_child);
 398         irq_set_chained_handler_and_data(irq, NULL, NULL);
 399         irq_domain_remove(chip->irqdomain);
 400
 401         return 0;
 402 }
 403
 404 static struct platform_driver pm8921_driver = {
 405         .probe          = pm8921_probe,
 406         .remove         = pm8921_remove,
 407         .driver         = {
 408                 .name   = "pm8921-core",
 409                 .of_match_table = pm8921_id_table,
 410         },
 411 };
 412
 413 static int __init pm8921_init(void)
 414 {
 415         return platform_driver_register(&pm8921_driver);
 416 }
 417 subsys_initcall(pm8921_init);
 418
 419 static void __exit pm8921_exit(void)
 420 {
 421         platform_driver_unregister(&pm8921_driver);
 422 }
 423 module_exit(pm8921_exit);
 424
 425 MODULE_LICENSE("GPL v2");
 426 MODULE_DESCRIPTION("PMIC 8921 core driver");
 427 MODULE_VERSION("1.0");
 428 MODULE_ALIAS("platform:pm8921-core");