drivers/mfd/mt6358-irq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2020 MediaTek Inc.
   4
   5 #include <linux/interrupt.h>
   6 #include <linux/mfd/mt6358/core.h>
   7 #include <linux/mfd/mt6358/registers.h>
   8 #include <linux/mfd/mt6397/core.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/of_irq.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15
  16 static struct irq_top_t mt6358_ints[] = {
  17         MT6358_TOP_GEN(BUCK),
  18         MT6358_TOP_GEN(LDO),
  19         MT6358_TOP_GEN(PSC),
  20         MT6358_TOP_GEN(SCK),
  21         MT6358_TOP_GEN(BM),
  22         MT6358_TOP_GEN(HK),
  23         MT6358_TOP_GEN(AUD),
  24         MT6358_TOP_GEN(MISC),
  25 };
  26
  27 static void pmic_irq_enable(struct irq_data *data)
  28 {
  29         unsigned int hwirq = irqd_to_hwirq(data);
  30         struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
  31         struct pmic_irq_data *irqd = chip->irq_data;
  32
  33         irqd->enable_hwirq[hwirq] = true;
  34 }
  35
  36 static void pmic_irq_disable(struct irq_data *data)
  37 {
  38         unsigned int hwirq = irqd_to_hwirq(data);
  39         struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
  40         struct pmic_irq_data *irqd = chip->irq_data;
  41
  42         irqd->enable_hwirq[hwirq] = false;
  43 }
  44
  45 static void pmic_irq_lock(struct irq_data *data)
  46 {
  47         struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
  48
  49         mutex_lock(&chip->irqlock);
  50 }
  51
  52 static void pmic_irq_sync_unlock(struct irq_data *data)
  53 {
  54         unsigned int i, top_gp, gp_offset, en_reg, int_regs, shift;
  55         struct mt6397_chip *chip = irq_data_get_irq_chip_data(data);
  56         struct pmic_irq_data *irqd = chip->irq_data;
  57
  58         for (i = 0; i < irqd->num_pmic_irqs; i++) {
  59                 if (irqd->enable_hwirq[i] == irqd->cache_hwirq[i])
  60                         continue;
  61
  62                 /* Find out the IRQ group */
  63                 top_gp = 0;
  64                 while ((top_gp + 1) < irqd->num_top &&
  65                        i >= mt6358_ints[top_gp + 1].hwirq_base)
  66                         top_gp++;
  67
  68                 /* Find the IRQ registers */
  69                 gp_offset = i - mt6358_ints[top_gp].hwirq_base;
  70                 int_regs = gp_offset / MT6358_REG_WIDTH;
  71                 shift = gp_offset % MT6358_REG_WIDTH;
  72                 en_reg = mt6358_ints[top_gp].en_reg +
  73                          (mt6358_ints[top_gp].en_reg_shift * int_regs);
  74
  75                 regmap_update_bits(chip->regmap, en_reg, BIT(shift),
  76                                    irqd->enable_hwirq[i] << shift);
  77
  78                 irqd->cache_hwirq[i] = irqd->enable_hwirq[i];
  79         }
  80         mutex_unlock(&chip->irqlock);
  81 }
  82
  83 static struct irq_chip mt6358_irq_chip = {
  84         .name = "mt6358-irq",
  85         .flags = IRQCHIP_SKIP_SET_WAKE,
  86         .irq_enable = pmic_irq_enable,
  87         .irq_disable = pmic_irq_disable,
  88         .irq_bus_lock = pmic_irq_lock,
  89         .irq_bus_sync_unlock = pmic_irq_sync_unlock,
  90 };
  91
  92 static void mt6358_irq_sp_handler(struct mt6397_chip *chip,
  93                                   unsigned int top_gp)
  94 {
  95         unsigned int irq_status, sta_reg, status;
  96         unsigned int hwirq, virq;
  97         int i, j, ret;
  98
  99         for (i = 0; i < mt6358_ints[top_gp].num_int_regs; i++) {
 100                 sta_reg = mt6358_ints[top_gp].sta_reg +
 101                         mt6358_ints[top_gp].sta_reg_shift * i;
 102
 103                 ret = regmap_read(chip->regmap, sta_reg, &irq_status);
 104                 if (ret) {
 105                         dev_err(chip->dev,
 106                                 "Failed to read IRQ status, ret=%d\n", ret);
 107                         return;
 108                 }
 109
 110                 if (!irq_status)
 111                         continue;
 112
 113                 status = irq_status;
 114                 do {
 115                         j = __ffs(status);
 116
 117                         hwirq = mt6358_ints[top_gp].hwirq_base +
 118                                 MT6358_REG_WIDTH * i + j;
 119
 120                         virq = irq_find_mapping(chip->irq_domain, hwirq);
 121                         if (virq)
 122                                 handle_nested_irq(virq);
 123
 124                         status &= ~BIT(j);
 125                 } while (status);
 126
 127                 regmap_write(chip->regmap, sta_reg, irq_status);
 128         }
 129 }
 130
 131 static irqreturn_t mt6358_irq_handler(int irq, void *data)
 132 {
 133         struct mt6397_chip *chip = data;
 134         struct pmic_irq_data *mt6358_irq_data = chip->irq_data;
 135         unsigned int bit, i, top_irq_status = 0;
 136         int ret;
 137
 138         ret = regmap_read(chip->regmap,
 139                           mt6358_irq_data->top_int_status_reg,
 140                           &top_irq_status);
 141         if (ret) {
 142                 dev_err(chip->dev,
 143                         "Failed to read status from the device, ret=%d\n", ret);
 144                 return IRQ_NONE;
 145         }
 146
 147         for (i = 0; i < mt6358_irq_data->num_top; i++) {
 148                 bit = BIT(mt6358_ints[i].top_offset);
 149                 if (top_irq_status & bit) {
 150                         mt6358_irq_sp_handler(chip, i);
 151                         top_irq_status &= ~bit;
 152                         if (!top_irq_status)
 153                                 break;
 154                 }
 155         }
 156
 157         return IRQ_HANDLED;
 158 }
 159
 160 static int pmic_irq_domain_map(struct irq_domain *d, unsigned int irq,
 161                                irq_hw_number_t hw)
 162 {
 163         struct mt6397_chip *mt6397 = d->host_data;
 164
 165         irq_set_chip_data(irq, mt6397);
 166         irq_set_chip_and_handler(irq, &mt6358_irq_chip, handle_level_irq);
 167         irq_set_nested_thread(irq, 1);
 168         irq_set_noprobe(irq);
 169
 170         return 0;
 171 }
 172
 173 static const struct irq_domain_ops mt6358_irq_domain_ops = {
 174         .map = pmic_irq_domain_map,
 175         .xlate = irq_domain_xlate_twocell,
 176 };
 177
 178 int mt6358_irq_init(struct mt6397_chip *chip)
 179 {
 180         int i, j, ret;
 181         struct pmic_irq_data *irqd;
 182
 183         irqd = devm_kzalloc(chip->dev, sizeof(*irqd), GFP_KERNEL);
 184         if (!irqd)
 185                 return -ENOMEM;
 186
 187         chip->irq_data = irqd;
 188
 189         mutex_init(&chip->irqlock);
 190         irqd->top_int_status_reg = MT6358_TOP_INT_STATUS0;
 191         irqd->num_pmic_irqs = MT6358_IRQ_NR;
 192         irqd->num_top = ARRAY_SIZE(mt6358_ints);
 193
 194         irqd->enable_hwirq = devm_kcalloc(chip->dev,
 195                                           irqd->num_pmic_irqs,
 196                                           sizeof(*irqd->enable_hwirq),
 197                                           GFP_KERNEL);
 198         if (!irqd->enable_hwirq)
 199                 return -ENOMEM;
 200
 201         irqd->cache_hwirq = devm_kcalloc(chip->dev,
 202                                          irqd->num_pmic_irqs,
 203                                          sizeof(*irqd->cache_hwirq),
 204                                          GFP_KERNEL);
 205         if (!irqd->cache_hwirq)
 206                 return -ENOMEM;
 207
 208         /* Disable all interrupts for initializing */
 209         for (i = 0; i < irqd->num_top; i++) {
 210                 for (j = 0; j < mt6358_ints[i].num_int_regs; j++)
 211                         regmap_write(chip->regmap,
 212                                      mt6358_ints[i].en_reg +
 213                                      mt6358_ints[i].en_reg_shift * j, 0);
 214         }
 215
 216         chip->irq_domain = irq_domain_add_linear(chip->dev->of_node,
 217                                                  irqd->num_pmic_irqs,
 218                                                  &mt6358_irq_domain_ops, chip);
 219         if (!chip->irq_domain) {
 220                 dev_err(chip->dev, "Could not create IRQ domain\n");
 221                 return -ENODEV;
 222         }
 223
 224         ret = devm_request_threaded_irq(chip->dev, chip->irq, NULL,
 225                                         mt6358_irq_handler, IRQF_ONESHOT,
 226                                         mt6358_irq_chip.name, chip);
 227         if (ret) {
 228                 dev_err(chip->dev, "Failed to register IRQ=%d, ret=%d\n",
 229                         chip->irq, ret);
 230                 return ret;
 231         }
 232
 233         enable_irq_wake(chip->irq);
 234         return ret;
 235 }