Added api to get the TWL5030 Si version from the IDCODE register.
It is used for enabling the workaround for TWL errata 27.
Signed-off-by: Lesly A M <leslyam@xxxxxx>
Cc: Nishanth Menon <nm@xxxxxx>
Cc: David Derrick <dderrick@xxxxxx>
Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
---
drivers/mfd/twl-core.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/i2c/twl.h | 10 +++++++++
2 files changed, 60 insertions(+), 0 deletions(-)
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index a35fa7d..211c2cc 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -487,6 +487,56 @@ EXPORT_SYMBOL(twl_i2c_read_u8);
/*----------------------------------------------------------------------*/
+/**
+ * twl_read_idcode_register - api to read the IDCODE register.
+ * @value: returns 32 bit IDCODE register value.
+ *
+ * Unlocks the IDCODE register and read the 32 bit value.
+ */
+int twl_read_idcode_register(u32 *value)
+{
+ int err = 0;
+
+ err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, TWL_EEPROM_R_UNLOCK,
+ R_UNLOCK_TEST_REG);
+ if (err)
+ pr_err("TWL4030 Unable to unlock IDCODE registers\n");
+
+ err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(value),
+ 0x0, 4);
+ if (err)
+ pr_err("TWL4030: unable to read IDCODE-%d\n", err);
+
+ err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, 0x0, R_UNLOCK_TEST_REG);
+ if (err)
+ pr_err("TWL4030 Unable to relock IDCODE registers\n");
+
+ return err;
+}
+
+/**
+ * twl5030_get_si_ver - api to get TWL5030 Si version.
+ * @value: returns Si version from IDCODE.
+ *
+ * Api to get the TWL5030 Si version from IDCODE value.
+ */
+int twl5030_get_si_ver(u32 *value)
+{
+ int ret = 0;
+ static u32 twl_idcode;
+
+ if (twl_idcode == 0)
+ ret = twl_read_idcode_register(&twl_idcode);
+ if (ret)
+ pr_err("TWL4030 Unable to check Si version\n");
+
+ if (TWL_SIL_TYPE(twl_idcode) == TWL_SIL_5030)
+ *value = TWL_SIL_REV(twl_idcode);
+
+ return ret;
+}
+EXPORT_SYMBOL(twl5030_get_si_ver);
+
static struct device *
add_numbered_child(unsigned chip, const char *name, int num,
void *pdata, unsigned pdata_len,
diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
index f4bd475..5d3f2bf 100644
--- a/include/linux/i2c/twl.h
+++ b/include/linux/i2c/twl.h
@@ -150,7 +150,15 @@
#define MMC_PU (0x1 << 3)
#define MMC_PD (0x1 << 2)
+#define R_UNLOCK_TEST_REG 0x12
+#define TWL_EEPROM_R_UNLOCK 0x49
+#define TWL_SIL_TYPE(rev) ((rev) & 0x00FFFFFF)
+#define TWL_SIL_REV(rev) ((rev) >> 24)
+#define TWL_SIL_5030 0x09002F
+#define TWL5030_REV_1_0 0x00
+#define TWL5030_REV_1_1 0x10
+#define TWL5030_REV_1_2 0x30
#define TWL4030_CLASS_ID 0x4030
#define TWL6030_CLASS_ID 0x6030
@@ -180,6 +188,8 @@ int twl_i2c_read_u8(u8 mod_no, u8 *val, u8 reg);
int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
+int twl5030_get_si_ver(u32 *value);
+
int twl6030_interrupt_unmask(u8 bit_mask, u8 offset);
int twl6030_interrupt_mask(u8 bit_mask, u8 offset);
--
1.7.1
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