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mfd: TWL5030 version checking in twl-core

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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 <[email protected]>
Cc: Nishanth Menon <[email protected]>
Cc: David Derrick <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
Lesly A M 2011-04-14 17:57:53 +05:30 • committed by Samuel Ortiz
commit ca972d1338
2 changed files with 78 additions and 1 deletions
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62
drivers/mfd/twl-core.c
View file

@ -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 @@ EXPORT_SYMBOL(twl_i2c_read_u8);
/*----------------------------------------------------------------------*/
/**
* 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 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
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 @@ twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
/* 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);