Merge remote-tracking branch 'regmap/topic/irq' into regmap-next

drivers/base/regmap/regmap-irq.c

@@ -35,6 +35,7 @@ struct regmap_irq_chip_data {
 	int wake_count;
 
 	void *status_reg_buf;
+	unsigned int *main_status_buf;
 	unsigned int *status_buf;
 	unsigned int *mask_buf;
 	unsigned int *mask_buf_def;
@@ -329,6 +330,33 @@ static const struct irq_chip regmap_irq_chip = {
 	.irq_set_wake		= regmap_irq_set_wake,
 };
 
+static inline int read_sub_irq_data(struct regmap_irq_chip_data *data,
+					   unsigned int b)
+{
+	const struct regmap_irq_chip *chip = data->chip;
+	struct regmap *map = data->map;
+	struct regmap_irq_sub_irq_map *subreg;
+	int i, ret = 0;
+
+	if (!chip->sub_reg_offsets) {
+		/* Assume linear mapping */
+		ret = regmap_read(map, chip->status_base +
+				  (b * map->reg_stride * data->irq_reg_stride),
+				   &data->status_buf[b]);
+	} else {
+		subreg = &chip->sub_reg_offsets[b];
+		for (i = 0; i < subreg->num_regs; i++) {
+			unsigned int offset = subreg->offset[i];
+
+			ret = regmap_read(map, chip->status_base + offset,
+					  &data->status_buf[offset]);
+			if (ret)
+				break;
+		}
+	}
+	return ret;
+}
+
 static irqreturn_t regmap_irq_thread(int irq, void *d)
 {
 	struct regmap_irq_chip_data *data = d;
@@ -352,11 +380,65 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
 	}
 
 	/*
-	 * Read in the statuses, using a single bulk read if possible
-	 * in order to reduce the I/O overheads.
+	 * Read only registers with active IRQs if the chip has 'main status
+	 * register'. Else read in the statuses, using a single bulk read if
+	 * possible in order to reduce the I/O overheads.
 	 */
-	if (!map->use_single_read && map->reg_stride == 1 &&
+
+	if (chip->num_main_regs) {
+		unsigned int max_main_bits;
+		unsigned long size;
+
+		size = chip->num_regs * sizeof(unsigned int);
+
+		max_main_bits = (chip->num_main_status_bits) ?
+				 chip->num_main_status_bits : chip->num_regs;
+		/* Clear the status buf as we don't read all status regs */
+		memset(data->status_buf, 0, size);
+
+		/* We could support bulk read for main status registers
+		 * but I don't expect to see devices with really many main
+		 * status registers so let's only support single reads for the
+		 * sake of simplicity. and add bulk reads only if needed
+		 */
+		for (i = 0; i < chip->num_main_regs; i++) {
+			ret = regmap_read(map, chip->main_status +
+				  (i * map->reg_stride
+				   * data->irq_reg_stride),
+				  &data->main_status_buf[i]);
+			if (ret) {
+				dev_err(map->dev,
+					"Failed to read IRQ status %d\n",
+					ret);
+				goto exit;
+			}
+		}
+
+		/* Read sub registers with active IRQs */
+		for (i = 0; i < chip->num_main_regs; i++) {
+			unsigned int b;
+			const unsigned long mreg = data->main_status_buf[i];
+
+			for_each_set_bit(b, &mreg, map->format.val_bytes * 8) {
+				if (i * map->format.val_bytes * 8 + b >
+				    max_main_bits)
+					break;
+				ret = read_sub_irq_data(data, b);
+
+				if (ret != 0) {
+					dev_err(map->dev,
+						"Failed to read IRQ status %d\n",
+						ret);
+					if (chip->runtime_pm)
+						pm_runtime_put(map->dev);
+					goto exit;
+				}
+			}
+
+		}
+	} else if (!map->use_single_read && map->reg_stride == 1 &&
 		   data->irq_reg_stride == 1) {
+
 		u8 *buf8 = data->status_reg_buf;
 		u16 *buf16 = data->status_reg_buf;
 		u32 *buf32 = data->status_reg_buf;
@@ -521,6 +603,15 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 	if (!d)
 		return -ENOMEM;
 
+	if (chip->num_main_regs) {
+		d->main_status_buf = kcalloc(chip->num_main_regs,
+					     sizeof(unsigned int),
+					     GFP_KERNEL);
+
+		if (!d->main_status_buf)
+			goto err_alloc;
+	}
+
 	d->status_buf = kcalloc(chip->num_regs, sizeof(unsigned int),
 				GFP_KERNEL);
 	if (!d->status_buf)

include/linux/regmap.h

@@ -1131,11 +1131,37 @@ struct regmap_irq {
 		.reg_offset = (_id) / (_reg_bits),	\
 	}
 
+#define REGMAP_IRQ_MAIN_REG_OFFSET(arr)				\
+	{ .num_regs = ARRAY_SIZE((arr)), .offset = &(arr)[0] }
+
+struct regmap_irq_sub_irq_map {
+	unsigned int num_regs;
+	unsigned int *offset;
+};
+
 /**
  * struct regmap_irq_chip - Description of a generic regmap irq_chip.
  *
  * @name:        Descriptive name for IRQ controller.
  *
+ * @main_status: Base main status register address. For chips which have
+ *		 interrupts arranged in separate sub-irq blocks with own IRQ
+ *		 registers and which have a main IRQ registers indicating
+ *		 sub-irq blocks with unhandled interrupts. For such chips fill
+ *		 sub-irq register information in status_base, mask_base and
+ *		 ack_base.
+ * @num_main_status_bits: Should be given to chips where number of meaningfull
+ *			  main status bits differs from num_regs.
+ * @sub_reg_offsets: arrays of mappings from main register bits to sub irq
+ *		     registers. First item in array describes the registers
+ *		     for first main status bit. Second array for second bit etc.
+ *		     Offset is given as sub register status offset to
+ *		     status_base. Should contain num_regs arrays.
+ *		     Can be provided for chips with more complex mapping than
+ *		     1.st bit to 1.st sub-reg, 2.nd bit to 2.nd sub-reg, ...
+ * @num_main_regs: Number of 'main status' irq registers for chips which have
+ *		   main_status set.
+ *
  * @status_base: Base status register address.
  * @mask_base:   Base mask register address.
  * @mask_writeonly: Base mask register is write only.
@@ -1181,6 +1207,11 @@ struct regmap_irq {
 struct regmap_irq_chip {
 	const char *name;
 
+	unsigned int main_status;
+	unsigned int num_main_status_bits;
+	struct regmap_irq_sub_irq_map *sub_reg_offsets;
+	int num_main_regs;
+
 	unsigned int status_base;
 	unsigned int mask_base;
 	unsigned int unmask_base;