A regmap field is an abstraction available in Linux. It provides to access
bitfields in a regmap without having to worry about shifts and masks.
Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
Changes in v2: None
drivers/core/regmap.c | 77 ++++++++++++++++++++++++++++++
include/regmap.h | 108 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 185 insertions(+)
diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 10ae9f918a..905bc0b63d 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -15,6 +15,14 @@
#include <dm/of_addr.h>
#include <linux/ioport.h>
+struct regmap_field {
+ struct regmap *regmap;
+ unsigned int mask;
+ /* lsb */
+ unsigned int shift;
+ unsigned int reg;
+};
+
DECLARE_GLOBAL_DATA_PTR;
/**
@@ -508,3 +516,72 @@ int regmap_update_bits(struct regmap *map, uint offset,
uint mask, uint val)
return regmap_write(map, offset, reg | (val & mask));
}
+
+int regmap_field_read(struct regmap_field *field, unsigned int *val)
+{
+ int ret;
+ unsigned int reg_val;
+
+ ret = regmap_read(field->regmap, field->reg, ®_val);
+ if (ret != 0)
+ return ret;
+
+ reg_val &= field->mask;
+ reg_val >>= field->shift;
+ *val = reg_val;
+
+ return ret;
+}
+
+int regmap_field_write(struct regmap_field *field, unsigned int val)
+{
+ return regmap_update_bits(field->regmap, field->reg, field->mask,
+ val << field->shift);
+}
+
+static void regmap_field_init(struct regmap_field *rm_field,
+ struct regmap *regmap,
+ struct reg_field reg_field)
+{
+ rm_field->regmap = regmap;
+ rm_field->reg = reg_field.reg;
+ rm_field->shift = reg_field.lsb;
+ rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
+}
+
+struct regmap_field *devm_regmap_field_alloc(struct udevice *dev,
+ struct regmap *regmap,
+ struct reg_field reg_field)
+{
+ struct regmap_field *rm_field = devm_kzalloc(dev, sizeof(*rm_field),
+ GFP_KERNEL);
+ if (!rm_field)
+ return ERR_PTR(-ENOMEM);
+
+ regmap_field_init(rm_field, regmap, reg_field);
+
+ return rm_field;
+}
+
+void devm_regmap_field_free(struct udevice *dev, struct regmap_field *field)
+{
+ devm_kfree(dev, field);
+}
+
+struct regmap_field *regmap_field_alloc(struct regmap *regmap,
+ struct reg_field reg_field)
+{
+ struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
+
+ if (!rm_field)
+ return ERR_PTR(-ENOMEM);
+
+ regmap_field_init(rm_field, regmap, reg_field);
+
+ return rm_field;
+}
+
+void regmap_field_free(struct regmap_field *field)
+{
+ kfree(field);
+}
diff --git a/include/regmap.h b/include/regmap.h
index 730e747d90..8619566a95 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -314,6 +314,43 @@ int regmap_raw_read_range(struct regmap *map, uint
range_num, uint offset,
regmap_read_poll_timeout_test(map, addr, val, cond, sleep_us, \
timeout_ms, 0) \
+/**
+ * regmap_field_read_poll_timeout - Poll until a condition is met or a timeout
+ * occurs
+ *
+ * @field: Regmap field to read from
+ * @val: Unsigned integer variable to read the value into
+ * @cond: Break condition (usually involving @val)
+ * @sleep_us: Maximum time to sleep between reads in us (0 tight-loops).
+ * @timeout_ms: Timeout in ms, 0 means never timeout
+ *
+ * Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_field_read
+ * error return value in case of a error read. In the two former cases,
+ * the last read value at @addr is stored in @val.
+ *
+ * This is modelled after the regmap_read_poll_timeout macros in linux but
+ * with millisecond timeout.
+ */
+#define regmap_field_read_poll_timeout(field, val, cond, sleep_us, timeout_ms)
\
+({ \
+ unsigned long __start = get_timer(0); \
+ int __ret; \
+ for (;;) { \
+ __ret = regmap_field_read((field), &(val)); \
+ if (__ret) \
+ break; \
+ if (cond) \
+ break; \
+ if ((timeout_ms) && get_timer(__start) > (timeout_ms)) { \
+ __ret = regmap_field_read((field), &(val)); \
+ break; \
+ } \
+ if ((sleep_us)) \
+ udelay((sleep_us)); \
+ } \
+ __ret ?: ((cond) ? 0 : -ETIMEDOUT); \
+})
+
/**
* regmap_update_bits() - Perform a read/modify/write using a mask
*
@@ -390,4 +427,75 @@ void *regmap_get_range(struct regmap *map, unsigned int
range_num);
*/
int regmap_uninit(struct regmap *map);
+/**
+ * struct reg_field - Description of an register field
+ *
+ * @reg: Offset of the register within the regmap bank
+ * @lsb: lsb of the register field.
+ * @msb: msb of the register field.
+ * @id_size: port size if it has some ports
+ * @id_offset: address offset for each ports
+ */
+struct reg_field {
+ unsigned int reg;
+ unsigned int lsb;
+ unsigned int msb;
+};
+
+struct regmap_field;
+
+#define REG_FIELD(_reg, _lsb, _msb) { \
+ .reg = _reg, \
+ .lsb = _lsb, \
+ .msb = _msb, \
+ }
+
+/**
+ * devm_regmap_field_alloc() - Allocate and initialise a register field.
+ *
+ * @dev: Device that will be interacted with
+ * @regmap: regmap bank in which this register field is located.
+ * @reg_field: Register field with in the bank.
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap_field. The regmap_field will be automatically freed
+ * by the device management code.
+ */
+struct regmap_field *devm_regmap_field_alloc(struct udevice *dev,
+ struct regmap *regmap,
+ struct reg_field reg_field);
+/**
+ * devm_regmap_field_free() - Free a register field allocated using
+ * devm_regmap_field_alloc.
+ *
+ * @dev: Device that will be interacted with
+ * @field: regmap field which should be freed.
+ *
+ * Free register field allocated using devm_regmap_field_alloc(). Usually
+ * drivers need not call this function, as the memory allocated via devm
+ * will be freed as per device-driver life-cyle.
+ */
+void devm_regmap_field_free(struct udevice *dev, struct regmap_field *field);
+
+/**
+ * regmap_field_write() - Write a value to a regmap field
+ *
+ * @field: Regmap field to write to
+ * @val: Data to write to the regmap at the specified offset
+ *
+ * Return: 0 if OK, -ve on error
+ */
+int regmap_field_write(struct regmap_field *field, unsigned int val);
+
+/**
+ * regmap_read() - Read a 32-bit value from a regmap
+ *
+ * @field: Regmap field to write to
+ * @valp: Pointer to the buffer to receive the data read from the regmap
+ * field
+ *
+ * Return: 0 if OK, -ve on error
+ */
+int regmap_field_read(struct regmap_field *field, unsigned int *val);
+
#endif
--
2.17.1
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
