mfd: TWL5030 version checking in twl-core
Added API to get the TWL5030 Si version from the IDCODE register.
It is used for enabling the workaround for TWL erratum 27.
Signed-off-by: Lesly A M <leslyam@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: David Derrick <dderrick@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 960b5be..2bd9e06 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -229,6 +229,9 @@
/* is driver active, bound to a chip? */
static bool inuse;
+/* TWL IDCODE Register value */
+static u32 twl_idcode;
+
static unsigned int twl_id;
unsigned int twl_rev(void)
{
@@ -487,6 +490,58 @@
/*----------------------------------------------------------------------*/
+/**
+ * twl_read_idcode_register - API to read the IDCODE register.
+ *
+ * Unlocks the IDCODE register and read the 32 bit value.
+ */
+static int twl_read_idcode_register(void)
+{
+ int err;
+
+ err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, TWL_EEPROM_R_UNLOCK,
+ REG_UNLOCK_TEST_REG);
+ if (err) {
+ pr_err("TWL4030 Unable to unlock IDCODE registers -%d\n", err);
+ goto fail;
+ }
+
+ err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(&twl_idcode),
+ REG_IDCODE_7_0, 4);
+ if (err) {
+ pr_err("TWL4030: unable to read IDCODE -%d\n", err);
+ goto fail;
+ }
+
+ err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, 0x0, REG_UNLOCK_TEST_REG);
+ if (err)
+ pr_err("TWL4030 Unable to relock IDCODE registers -%d\n", err);
+fail:
+ return err;
+}
+
+/**
+ * twl_get_type - API to get TWL Si type.
+ *
+ * Api to get the TWL Si type from IDCODE value.
+ */
+int twl_get_type(void)
+{
+ return TWL_SIL_TYPE(twl_idcode);
+}
+EXPORT_SYMBOL_GPL(twl_get_type);
+
+/**
+ * twl_get_version - API to get TWL Si version.
+ *
+ * Api to get the TWL Si version from IDCODE value.
+ */
+int twl_get_version(void)
+{
+ return TWL_SIL_REV(twl_idcode);
+}
+EXPORT_SYMBOL_GPL(twl_get_version);
+
static struct device *
add_numbered_child(unsigned chip, const char *name, int num,
void *pdata, unsigned pdata_len,
@@ -1014,6 +1069,7 @@
unsigned i;
struct twl4030_platform_data *pdata = client->dev.platform_data;
u8 temp;
+ int ret = 0;
if (!pdata) {
dev_dbg(&client->dev, "no platform data?\n");
@@ -1060,6 +1116,12 @@
/* setup clock framework */
clocks_init(&client->dev, pdata->clock);
+ /* read TWL IDCODE Register */
+ if (twl_id == TWL4030_CLASS_ID) {
+ ret = twl_read_idcode_register();
+ WARN(ret < 0, "Error: reading twl_idcode register value\n");
+ }
+
/* load power event scripts */
if (twl_has_power() && pdata->power)
twl4030_power_init(pdata->power);