Merge tag 'regmap-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "A few new APIs here, support for the FSI bus (which is used in some
  PowerPC systems) plus a couple of new APIs, one allowing abstractions
  built on top of regmap to tell if the regmap can be used in an atomic
  context and one providing a callback for an in flight device which
  can't do interrupt masking very well.

  There's also a fix that I never got round to sending because it really
  should be fixed better but that's not happened yet and it does avoid
  the problem, the fix was in -next for a long time"

* tag 'regmap-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap-irq: Add handle_mask_sync() callback
  regmap: Add FSI bus support
  regmap: add regmap_might_sleep()
  regmap-irq: Use the new num_config_regs property in regmap_add_irq_chip_fwnode

6 files changed, 341 insertions, 18 deletions

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 159bac6c50466c..cd4bb642b9de25 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -4,7 +4,7 @@
 # subsystems should select the appropriate symbols.
 
 config REGMAP
-	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO)
+	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MDIO || REGMAP_FSI)
 	select IRQ_DOMAIN if REGMAP_IRQ
 	select MDIO_BUS if REGMAP_MDIO
 	bool
@@ -65,3 +65,7 @@ config REGMAP_I3C
 config REGMAP_SPI_AVMM
 	tristate
 	depends on SPI
+
+config REGMAP_FSI
+	tristate
+	depends on FSI
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index 11facb32a027e9..6990de7ca9a965 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o
 obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o
 obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o
 obj-$(CONFIG_REGMAP_MDIO) += regmap-mdio.o
+obj-$(CONFIG_REGMAP_FSI) += regmap-fsi.o
diff --git a/drivers/base/regmap/regmap-fsi.c b/drivers/base/regmap/regmap-fsi.c
new file mode 100644
index 00000000000000..3d2f3cb31d5eb7
--- /dev/null
+++ b/drivers/base/regmap/regmap-fsi.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Register map access API - FSI support
+//
+// Copyright 2022 IBM Corp
+//
+// Author: Eddie James <eajames@linux.ibm.com>
+
+#include <linux/fsi.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "internal.h"
+
+static int regmap_fsi32_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	u32 v;
+	int ret;
+
+	ret = fsi_slave_read(context, reg, &v, sizeof(v));
+	if (ret)
+		return ret;
+
+	*val = v;
+	return 0;
+}
+
+static int regmap_fsi32_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	u32 v = val;
+
+	return fsi_slave_write(context, reg, &v, sizeof(v));
+}
+
+static const struct regmap_bus regmap_fsi32 = {
+	.reg_write = regmap_fsi32_reg_write,
+	.reg_read = regmap_fsi32_reg_read,
+};
+
+static int regmap_fsi32le_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	__be32 v;
+	int ret;
+
+	ret = fsi_slave_read(context, reg, &v, sizeof(v));
+	if (ret)
+		return ret;
+
+	*val = be32_to_cpu(v);
+	return 0;
+}
+
+static int regmap_fsi32le_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	__be32 v = cpu_to_be32(val);
+
+	return fsi_slave_write(context, reg, &v, sizeof(v));
+}
+
+static const struct regmap_bus regmap_fsi32le = {
+	.reg_write = regmap_fsi32le_reg_write,
+	.reg_read = regmap_fsi32le_reg_read,
+};
+
+static int regmap_fsi16_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	u16 v;
+	int ret;
+
+	ret = fsi_slave_read(context, reg, &v, sizeof(v));
+	if (ret)
+		return ret;
+
+	*val = v;
+	return 0;
+}
+
+static int regmap_fsi16_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	u16 v;
+
+	if (val > 0xffff)
+		return -EINVAL;
+
+	v = val;
+	return fsi_slave_write(context, reg, &v, sizeof(v));
+}
+
+static const struct regmap_bus regmap_fsi16 = {
+	.reg_write = regmap_fsi16_reg_write,
+	.reg_read = regmap_fsi16_reg_read,
+};
+
+static int regmap_fsi16le_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	__be16 v;
+	int ret;
+
+	ret = fsi_slave_read(context, reg, &v, sizeof(v));
+	if (ret)
+		return ret;
+
+	*val = be16_to_cpu(v);
+	return 0;
+}
+
+static int regmap_fsi16le_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	__be16 v;
+
+	if (val > 0xffff)
+		return -EINVAL;
+
+	v = cpu_to_be16(val);
+	return fsi_slave_write(context, reg, &v, sizeof(v));
+}
+
+static const struct regmap_bus regmap_fsi16le = {
+	.reg_write = regmap_fsi16le_reg_write,
+	.reg_read = regmap_fsi16le_reg_read,
+};
+
+static int regmap_fsi8_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	u8 v;
+	int ret;
+
+	ret = fsi_slave_read(context, reg, &v, sizeof(v));
+	if (ret)
+		return ret;
+
+	*val = v;
+	return 0;
+}
+
+static int regmap_fsi8_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	u8 v;
+
+	if (val > 0xff)
+		return -EINVAL;
+
+	v = val;
+	return fsi_slave_write(context, reg, &v, sizeof(v));
+}
+
+static const struct regmap_bus regmap_fsi8 = {
+	.reg_write = regmap_fsi8_reg_write,
+	.reg_read = regmap_fsi8_reg_read,
+};
+
+static const struct regmap_bus *regmap_get_fsi_bus(struct fsi_device *fsi_dev,
+						   const struct regmap_config *config)
+{
+	const struct regmap_bus *bus = NULL;
+
+	if (config->reg_bits == 8 || config->reg_bits == 16 || config->reg_bits == 32) {
+		switch (config->val_bits) {
+		case 8:
+			bus = &regmap_fsi8;
+			break;
+		case 16:
+			switch (regmap_get_val_endian(&fsi_dev->dev, NULL, config)) {
+			case REGMAP_ENDIAN_LITTLE:
+#ifdef __LITTLE_ENDIAN
+			case REGMAP_ENDIAN_NATIVE:
+#endif
+				bus = &regmap_fsi16le;
+				break;
+			case REGMAP_ENDIAN_DEFAULT:
+			case REGMAP_ENDIAN_BIG:
+#ifdef __BIG_ENDIAN
+			case REGMAP_ENDIAN_NATIVE:
+#endif
+				bus = &regmap_fsi16;
+				break;
+			default:
+				break;
+			}
+			break;
+		case 32:
+			switch (regmap_get_val_endian(&fsi_dev->dev, NULL, config)) {
+			case REGMAP_ENDIAN_LITTLE:
+#ifdef __LITTLE_ENDIAN
+			case REGMAP_ENDIAN_NATIVE:
+#endif
+				bus = &regmap_fsi32le;
+				break;
+			case REGMAP_ENDIAN_DEFAULT:
+			case REGMAP_ENDIAN_BIG:
+#ifdef __BIG_ENDIAN
+			case REGMAP_ENDIAN_NATIVE:
+#endif
+				bus = &regmap_fsi32;
+				break;
+			default:
+				break;
+			}
+			break;
+		}
+	}
+
+	return bus ?: ERR_PTR(-EOPNOTSUPP);
+}
+
+struct regmap *__regmap_init_fsi(struct fsi_device *fsi_dev, const struct regmap_config *config,
+				 struct lock_class_key *lock_key, const char *lock_name)
+{
+	const struct regmap_bus *bus = regmap_get_fsi_bus(fsi_dev, config);
+
+	if (IS_ERR(bus))
+		return ERR_CAST(bus);
+
+	return __regmap_init(&fsi_dev->dev, bus, fsi_dev->slave, config, lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_fsi);
+
+struct regmap *__devm_regmap_init_fsi(struct fsi_device *fsi_dev,
+				      const struct regmap_config *config,
+				      struct lock_class_key *lock_key, const char *lock_name)
+{
+	const struct regmap_bus *bus = regmap_get_fsi_bus(fsi_dev, config);
+
+	if (IS_ERR(bus))
+		return ERR_CAST(bus);
+
+	return __devm_regmap_init(&fsi_dev->dev, bus, fsi_dev->slave, config, lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_fsi);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 4ef9488d05cde4..a8f185430a0741 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -115,12 +115,20 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 	 */
 	for (i = 0; i < d->chip->num_regs; i++) {
 		if (d->mask_base) {
-			reg = d->get_irq_reg(d, d->mask_base, i);
-			ret = regmap_update_bits(d->map, reg,
-					d->mask_buf_def[i], d->mask_buf[i]);
-			if (ret)
-				dev_err(d->map->dev, "Failed to sync masks in %x\n",
-					reg);
+			if (d->chip->handle_mask_sync)
+				d->chip->handle_mask_sync(d->map, i,
+							  d->mask_buf_def[i],
+							  d->mask_buf[i],
+							  d->chip->irq_drv_data);
+			else {
+				reg = d->get_irq_reg(d, d->mask_base, i);
+				ret = regmap_update_bits(d->map, reg,
+						d->mask_buf_def[i],
+						d->mask_buf[i]);
+				if (ret)
+					dev_err(d->map->dev, "Failed to sync masks in %x\n",
+						reg);
+			}
 		}
 
 		if (d->unmask_base) {
@@ -722,6 +730,7 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 	int i;
 	int ret = -ENOMEM;
 	int num_type_reg;
+	int num_regs;
 	u32 reg;
 
 	if (chip->num_regs <= 0)
@@ -796,14 +805,20 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 			goto err_alloc;
 	}
 
-	num_type_reg = chip->type_in_mask ? chip->num_regs : chip->num_type_reg;
-	if (num_type_reg) {
-		d->type_buf_def = kcalloc(num_type_reg,
+	/*
+	 * Use num_config_regs if defined, otherwise fall back to num_type_reg
+	 * to maintain backward compatibility.
+	 */
+	num_type_reg = chip->num_config_regs ? chip->num_config_regs
+			: chip->num_type_reg;
+	num_regs = chip->type_in_mask ? chip->num_regs : num_type_reg;
+	if (num_regs) {
+		d->type_buf_def = kcalloc(num_regs,
 					  sizeof(*d->type_buf_def), GFP_KERNEL);
 		if (!d->type_buf_def)
 			goto err_alloc;
 
-		d->type_buf = kcalloc(num_type_reg, sizeof(*d->type_buf),
+		d->type_buf = kcalloc(num_regs, sizeof(*d->type_buf),
 				      GFP_KERNEL);
 		if (!d->type_buf)
 			goto err_alloc;
@@ -917,13 +932,23 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 		d->mask_buf[i] = d->mask_buf_def[i];
 
 		if (d->mask_base) {
-			reg = d->get_irq_reg(d, d->mask_base, i);
-			ret = regmap_update_bits(d->map, reg,
-					d->mask_buf_def[i], d->mask_buf[i]);
-			if (ret) {
-				dev_err(map->dev, "Failed to set masks in 0x%x: %d\n",
-					reg, ret);
-				goto err_alloc;
+			if (chip->handle_mask_sync) {
+				ret = chip->handle_mask_sync(d->map, i,
+							     d->mask_buf_def[i],
+							     d->mask_buf[i],
+							     chip->irq_drv_data);
+				if (ret)
+					goto err_alloc;
+			} else {
+				reg = d->get_irq_reg(d, d->mask_base, i);
+				ret = regmap_update_bits(d->map, reg,
+						d->mask_buf_def[i],
+						d->mask_buf[i]);
+				if (ret) {
+					dev_err(map->dev, "Failed to set masks in 0x%x: %d\n",
+						reg, ret);
+					goto err_alloc;
+				}
 			}
 		}
 
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index c6d6d53e8cd3fc..d12d669157f244 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -3486,6 +3486,19 @@ int regmap_get_reg_stride(struct regmap *map)
 }
 EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
 
+/**
+ * regmap_might_sleep() - Returns whether a regmap access might sleep.
+ *
+ * @map: Register map to operate on.
+ *
+ * Returns true if an access to the register might sleep, else false.
+ */
+bool regmap_might_sleep(struct regmap *map)
+{
+	return map->can_sleep;
+}
+EXPORT_SYMBOL_GPL(regmap_might_sleep);
+
 int regmap_parse_val(struct regmap *map, const void *buf,
 			unsigned int *val)
 {
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index ca3434dca3a06a..a3bc695bcca09b 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -24,6 +24,7 @@ struct module;
 struct clk;
 struct device;
 struct device_node;
+struct fsi_device;
 struct i2c_client;
 struct i3c_device;
 struct irq_domain;
@@ -628,6 +629,10 @@ struct regmap *__regmap_init_spi_avmm(struct spi_device *spi,
 				      const struct regmap_config *config,
 				      struct lock_class_key *lock_key,
 				      const char *lock_name);
+struct regmap *__regmap_init_fsi(struct fsi_device *fsi_dev,
+				 const struct regmap_config *config,
+				 struct lock_class_key *lock_key,
+				 const char *lock_name);
 
 struct regmap *__devm_regmap_init(struct device *dev,
 				  const struct regmap_bus *bus,
@@ -693,6 +698,11 @@ struct regmap *__devm_regmap_init_spi_avmm(struct spi_device *spi,
 					   const struct regmap_config *config,
 					   struct lock_class_key *lock_key,
 					   const char *lock_name);
+struct regmap *__devm_regmap_init_fsi(struct fsi_device *fsi_dev,
+				      const struct regmap_config *config,
+				      struct lock_class_key *lock_key,
+				      const char *lock_name);
+
 /*
  * Wrapper for regmap_init macros to include a unique lockdep key and name
  * for each call. No-op if CONFIG_LOCKDEP is not set.
@@ -920,6 +930,19 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
 				 spi, config)
 
 /**
+ * regmap_init_fsi() - Initialise register map
+ *
+ * @fsi_dev: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+#define regmap_init_fsi(fsi_dev, config)				\
+	__regmap_lockdep_wrapper(__regmap_init_fsi, #config, fsi_dev,	\
+				 config)
+
+/**
  * devm_regmap_init() - Initialise managed register map
  *
  * @dev: Device that will be interacted with
@@ -1148,6 +1171,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
 	__regmap_lockdep_wrapper(__devm_regmap_init_spi_avmm, #config,	\
 				 spi, config)
 
+/**
+ * devm_regmap_init_fsi() - Initialise managed register map
+ *
+ * @fsi_dev: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap.  The regmap will be automatically freed by the
+ * device management code.
+ */
+#define devm_regmap_init_fsi(fsi_dev, config)				\
+	__regmap_lockdep_wrapper(__devm_regmap_init_fsi, #config,	\
+				 fsi_dev, config)
+
 int regmap_mmio_attach_clk(struct regmap *map, struct clk *clk);
 void regmap_mmio_detach_clk(struct regmap *map);
 void regmap_exit(struct regmap *map);
@@ -1219,6 +1256,7 @@ static inline int regmap_write_bits(struct regmap *map, unsigned int reg,
 int regmap_get_val_bytes(struct regmap *map);
 int regmap_get_max_register(struct regmap *map);
 int regmap_get_reg_stride(struct regmap *map);
+bool regmap_might_sleep(struct regmap *map);
 int regmap_async_complete(struct regmap *map);
 bool regmap_can_raw_write(struct regmap *map);
 size_t regmap_get_raw_read_max(struct regmap *map);
@@ -1542,6 +1580,8 @@ struct regmap_irq_chip_data;
  *		     before regmap_irq_handler process the interrupts.
  * @handle_post_irq: Driver specific callback to handle interrupt from device
  *		     after handling the interrupts in regmap_irq_handler().
+ * @handle_mask_sync: Callback used to handle IRQ mask syncs. The index will be
+ *		      in the range [0, num_regs)
  * @set_type_virt:   Driver specific callback to extend regmap_irq_set_type()
  *		     and configure virt regs. Deprecated, use @set_type_config
  *		     callback and config registers instead.
@@ -1603,6 +1643,9 @@ struct regmap_irq_chip {
 
 	int (*handle_pre_irq)(void *irq_drv_data);
 	int (*handle_post_irq)(void *irq_drv_data);
+	int (*handle_mask_sync)(struct regmap *map, int index,
+				unsigned int mask_buf_def,
+				unsigned int mask_buf, void *irq_drv_data);
 	int (*set_type_virt)(unsigned int **buf, unsigned int type,
 			     unsigned long hwirq, int reg);
 	int (*set_type_config)(unsigned int **buf, unsigned int type,
@@ -1905,6 +1948,12 @@ static inline int regmap_get_reg_stride(struct regmap *map)
 	return -EINVAL;
 }
 
+static inline bool regmap_might_sleep(struct regmap *map)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return true;
+}
+
 static inline int regcache_sync(struct regmap *map)
 {
 	WARN_ONCE(1, "regmap API is disabled");