[RFC 12/14] regmap: SoundWire: Add regmap support for SoundWire bus

From: Hardik Shah
Date: Fri Oct 21 2016 - 08:41:29 EST

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Signed-off-by: Hardik Shah <hardik.t.shah@xxxxxxxxx>
Signed-off-by: Sanyog Kale <sanyog.r.kale@xxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
drivers/base/regmap/Kconfig | 3 +
drivers/base/regmap/Makefile | 1 +
drivers/base/regmap/regmap-sdw.c | 240 ++++++++++++++++++++++++++++++++++++++
include/linux/regmap.h | 37 ++++++
4 files changed, 281 insertions(+)
create mode 100644 drivers/base/regmap/regmap-sdw.c

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index db9d00c3..1d650c1 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -29,3 +29,6 @@ config REGMAP_MMIO

config REGMAP_IRQ
bool
+
+config REGMAP_SDW
+ depends on SOUND_SDW
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index 609e4c8..ee041e0 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o
obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o
+obj-$(CONFIG_REGMAP_SDW) += regmap-sdw.o
diff --git a/drivers/base/regmap/regmap-sdw.c b/drivers/base/regmap/regmap-sdw.c
new file mode 100644
index 0000000..d76ee12
--- /dev/null
+++ b/drivers/base/regmap/regmap-sdw.c
@@ -0,0 +1,240 @@
+/*
+ * regmap-sdw.c - Register map access API - SoundWire support.
+ *
+ * Copyright (C) 2015-2016 Intel Corp
+ * Author: Hardik Shah <hardik.t.shah@xxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+
+#include <linux/regmap.h>
+#include <sound/sdw_bus.h>
+#include <sound/sdw_master.h>
+#include <sound/sdw_slave.h>
+#include <linux/module.h>
+#include <sound/sdw/sdw_registers.h>
+
+#include "internal.h"
+
+
+static inline void get_t_size(size_t *t_val_size, size_t *t_size,
+ int *reg_addr,
+ int *offset,
+ size_t *val_size)
+{
+
+ *t_val_size += *t_size;
+ *offset += *t_size;
+
+ *t_size = *val_size - *t_val_size;
+ *t_size = min_t(size_t, *t_size, 65535);
+
+ *reg_addr += *t_size;
+
+
+}
+
+static int regmap_sdw_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct sdw_slave *sdw = to_sdw_slave(dev);
+ struct sdw_msg xfer;
+ int ret, scp_addr1, scp_addr2;
+ int reg_command;
+ int reg_addr = *(u32 *)reg;
+ size_t t_val_size = 0, t_size;
+ int offset;
+ u8 *t_val;
+
+ /* SoundWire registers are 32-bit addressed */
+ if (reg_size != 4)
+ return -ENOTSUPP;
+
+ xfer.dev_num = sdw->dev_num;
+ xfer.xmit_on_ssp = 0;
+ xfer.r_w_flag = SDW_MSG_FLAG_READ;
+ xfer.len = 0;
+ t_val = val;
+
+ offset = 0;
+ reg_command = (reg_addr >> SDW_REGADDR_SHIFT) &
+ SDW_REGADDR_MASK;
+ if (val_size > SDW_MAX_REG_ADDR)
+ t_size = SDW_MAX_REG_ADDR - reg_command;
+ else
+ t_size = val_size;
+
+ while (t_val_size < val_size) {
+
+ scp_addr1 = (reg_addr >> SDW_SCP_ADDRPAGE1_SHIFT) &
+ SDW_SCP_ADDRPAGE1_MASK;
+ scp_addr2 = (reg_addr >> SDW_SCP_ADDRPAGE2_SHIFT) &
+ SDW_SCP_ADDRPAGE2_MASK;
+ xfer.addr_page1 = scp_addr1;
+ xfer.addr_page2 = scp_addr2;
+ xfer.addr = reg_command;
+ xfer.len += t_size;
+ xfer.buf = &t_val[offset];
+ ret = snd_sdw_slave_transfer(sdw->mstr, &xfer, 1);
+ if (ret < 0)
+ return ret;
+ else if (ret != 1)
+ return -EIO;
+
+ get_t_size(&t_val_size, &t_size, &reg_addr, &offset,
+ &val_size);
+
+ reg_command = (reg_addr >> SDW_REGADDR_SHIFT) &
+ SDW_REGADDR_MASK;
+ }
+ return 0;
+}
+
+static int regmap_sdw_gather_write(void *context,
+ const void *reg, size_t reg_size,
+ const void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct sdw_slave *sdw = to_sdw_slave(dev);
+ struct sdw_msg xfer;
+ int ret, scp_addr1, scp_addr2;
+ int reg_command;
+ int reg_addr = *(u32 *)reg;
+ size_t t_val_size = 0, t_size;
+ int offset;
+ u8 *t_val;
+
+ /* All registers are 4 byte on SoundWire bus */
+ if (reg_size != 4)
+ return -ENOTSUPP;
+
+ if (!sdw)
+ return 0;
+
+ xfer.dev_num = sdw->dev_num;
+ xfer.xmit_on_ssp = 0;
+ xfer.r_w_flag = SDW_MSG_FLAG_WRITE;
+ xfer.len = 0;
+ t_val = (u8 *)val;
+
+ offset = 0;
+ reg_command = (reg_addr >> SDW_REGADDR_SHIFT) &
+ SDW_REGADDR_MASK;
+ if (val_size > SDW_MAX_REG_ADDR)
+ t_size = SDW_MAX_REG_ADDR - reg_command;
+ else
+ t_size = val_size;
+ while (t_val_size < val_size) {
+
+ scp_addr1 = (reg_addr >> SDW_SCP_ADDRPAGE1_SHIFT) &
+ SDW_SCP_ADDRPAGE1_MASK;
+ scp_addr2 = (reg_addr >> SDW_SCP_ADDRPAGE2_SHIFT) &
+ SDW_SCP_ADDRPAGE2_MASK;
+ xfer.addr_page1 = scp_addr1;
+ xfer.addr_page2 = scp_addr2;
+ xfer.addr = reg_command;
+ xfer.len += t_size;
+ xfer.buf = &t_val[offset];
+ ret = snd_sdw_slave_transfer(sdw->mstr, &xfer, 1);
+ if (ret < 0)
+ return ret;
+ else if (ret != 1)
+ return -EIO;
+
+ get_t_size(&t_val_size, &t_size, &reg_addr, &offset,
+ &val_size);
+
+ reg_command = (reg_addr >> SDW_REGADDR_SHIFT) &
+ SDW_REGADDR_MASK;
+ }
+ return 0;
+}
+
+static int regmap_sdw_write(void *context, const void *data, size_t count)
+{
+ /* 4-byte register address for the soundwire */
+ unsigned int offset = 4;
+
+ if (count <= offset)
+ return -EINVAL;
+
+ return regmap_sdw_gather_write(context, data, 4,
+ data + offset, count - offset);
+}
+
+static struct regmap_bus regmap_sdw = {
+ .write = regmap_sdw_write,
+ .gather_write = regmap_sdw_gather_write,
+ .read = regmap_sdw_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
+ .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
+};
+
+static int regmap_sdw_config_check(const struct regmap_config *config)
+{
+ /* All register are 8-bits wide as per MIPI Soundwire 1.0 Spec */
+ if (config->val_bits != 8)
+ return -ENOTSUPP;
+ /* Registers are 32 bit in size, based on SCP_ADDR1 and SCP_ADDR2
+ * implementation address range may vary in slave.
+ */
+ if (config->reg_bits != 32)
+ return -ENOTSUPP;
+ /* SoundWire register address are contiguous. */
+ if (config->reg_stride != 0)
+ return -ENOTSUPP;
+ if (config->pad_bits != 0)
+ return -ENOTSUPP;
+
+
+ return 0;
+}
+
+struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ int ret;
+
+ ret = regmap_sdw_config_check(config);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return __regmap_init(&sdw->dev, &regmap_sdw, &sdw->dev, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__regmap_init_sdw);
+
+
+struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
+ const struct regmap_config *config,
+ struct lock_class_key *lock_key,
+ const char *lock_name)
+{
+ int ret;
+
+ ret = regmap_sdw_config_check(config);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return __devm_regmap_init(&sdw->dev, &regmap_sdw, &sdw->dev, config,
+ lock_key, lock_name);
+}
+EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
+
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 9adc7b2..5c192f7 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -29,6 +29,7 @@
struct regmap_range_cfg;
struct regmap_field;
struct snd_ac97;
+struct sdw_slave;

/* An enum of all the supported cache types */
enum regcache_type {
@@ -456,6 +457,10 @@ struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
+struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
+ 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,
@@ -489,6 +494,10 @@ struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name);
+struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
+ 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
@@ -623,6 +632,20 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);

/**
+ * regmap_init_sdw(): Initialise register map
+ *
+ * @sdw: 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_sdw(sdw, config) \
+ __regmap_lockdep_wrapper(__regmap_init_sdw, #config, \
+ sdw, config)
+
+
+/**
* devm_regmap_init(): Initialise managed register map
*
* @dev: Device that will be interacted with
@@ -737,6 +760,20 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
__regmap_lockdep_wrapper(__devm_regmap_init_ac97, #config, \
ac97, config)

+/**
+ * devm_regmap_init_sdw(): Initialise managed register map
+ *
+ * @sdw: 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_sdw(sdw, config) \
+ __regmap_lockdep_wrapper(__devm_regmap_init_sdw, #config, \
+ sdw, config)
+
void regmap_exit(struct regmap *map);
int regmap_reinit_cache(struct regmap *map,
const struct regmap_config *config);
--
1.7.9.5

Next message: Hardik Shah: "[RFC 10/14] SoundWire: Add support for clock stop"
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