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Message-Id: <20221102205148.1334459-2-eajames@linux.ibm.com>
Date: Wed, 2 Nov 2022 15:51:44 -0500
From: Eddie James <eajames@...ux.ibm.com>
To: linux-fsi@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, broonie@...nel.org,
gregkh@...uxfoundation.org, rafael@...nel.org, jk@...abs.org,
joel@....id.au, alistair@...ple.id.au, eajames@...ux.ibm.com
Subject: [PATCH v2 1/5] regmap: Add FSI bus support
Add regmap support for the FSI bus.
Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
drivers/base/regmap/Kconfig | 6 +-
drivers/base/regmap/Makefile | 1 +
drivers/base/regmap/regmap-fsi.c | 231 +++++++++++++++++++++++++++++++
include/linux/regmap.h | 37 +++++
4 files changed, 274 insertions(+), 1 deletion(-)
create mode 100644 drivers/base/regmap/regmap-fsi.c
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 159bac6c5046..cd4bb642b9de 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 11facb32a027..6990de7ca9a9 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 000000000000..3d2f3cb31d5e
--- /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@...ux.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 = ®map_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 = ®map_fsi16le;
+ break;
+ case REGMAP_ENDIAN_DEFAULT:
+ case REGMAP_ENDIAN_BIG:
+#ifdef __BIG_ENDIAN
+ case REGMAP_ENDIAN_NATIVE:
+#endif
+ bus = ®map_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 = ®map_fsi32le;
+ break;
+ case REGMAP_ENDIAN_DEFAULT:
+ case REGMAP_ENDIAN_BIG:
+#ifdef __BIG_ENDIAN
+ case REGMAP_ENDIAN_NATIVE:
+#endif
+ bus = ®map_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/include/linux/regmap.h b/include/linux/regmap.h
index ca3434dca3a0..e477112fb1c7 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.
@@ -919,6 +929,19 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
__regmap_lockdep_wrapper(__regmap_init_spi_avmm, #config, \
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
*
@@ -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);
--
2.31.1
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