diff options
| author | Igor Grinberg <grinberg@compulab.co.il> | 2011-11-13 11:49:50 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-01-09 00:37:40 +0100 |
| commit | 26cc3ab984cd00e95cb58ba5aaea4238ea56c700 (patch) | |
| tree | 472a56db7678b50e3d6bba59c2f04a09e40635be /drivers/mfd/twl4030-power.c | |
| parent | aeb5032b3f8b9ab69daa545777433fa94b3494c4 (diff) | |
| download | linux-26cc3ab984cd00e95cb58ba5aaea4238ea56c700.tar.bz2 | |
mfd: Add power off functionality to TWL
TWL family of PMICs, used in master mode, have a power off
functionality. The resulting power off sequence shuts down all the SoC
supplies, LDOs, etc. The sequence is described in the datasheets
chapter "Power-Off Sequence".
Note, that board must be wired correctly for the power off to work as
expected.
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/twl4030-power.c')
| -rw-r--r-- | drivers/mfd/twl4030-power.c | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c index a764676f0922..d905f5171153 100644 --- a/drivers/mfd/twl4030-power.c +++ b/drivers/mfd/twl4030-power.c @@ -34,7 +34,8 @@ static u8 twl4030_start_script_address = 0x2b; #define PWR_P1_SW_EVENTS 0x10 -#define PWR_DEVOFF (1<<0) +#define PWR_DEVOFF (1 << 0) +#define SEQ_OFFSYNC (1 << 0) #define PHY_TO_OFF_PM_MASTER(p) (p - 0x36) #define PHY_TO_OFF_PM_RECEIVER(p) (p - 0x5b) @@ -511,12 +512,27 @@ int twl4030_remove_script(u8 flags) return err; } +/* + * In master mode, start the power off sequence. + * After a successful execution, TWL shuts down the power to the SoC + * and all peripherals connected to it. + */ +void twl4030_power_off(void) +{ + int err; + + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, PWR_DEVOFF, + TWL4030_PM_MASTER_P1_SW_EVENTS); + if (err) + pr_err("TWL4030 Unable to power off\n"); +} + void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) { int err = 0; int i; struct twl4030_resconfig *resconfig; - u8 address = twl4030_start_script_address; + u8 val, address = twl4030_start_script_address; err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1, @@ -548,6 +564,28 @@ void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) } } + /* Board has to be wired properly to use this feature */ + if (twl4030_scripts->use_poweroff && !pm_power_off) { + /* Default for SEQ_OFFSYNC is set, lets ensure this */ + err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &val, + TWL4030_PM_MASTER_CFG_P123_TRANSITION); + if (err) { + pr_warning("TWL4030 Unable to read registers\n"); + + } else if (!(val & SEQ_OFFSYNC)) { + val |= SEQ_OFFSYNC; + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, val, + TWL4030_PM_MASTER_CFG_P123_TRANSITION); + if (err) { + pr_err("TWL4030 Unable to setup SEQ_OFFSYNC\n"); + goto relock; + } + } + + pm_power_off = twl4030_power_off; + } + +relock: err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, TWL4030_PM_MASTER_PROTECT_KEY); if (err) |