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| author | Mike Turquette <mturquette@ti.com> | 2010-02-22 11:16:30 -0600 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-03-07 22:17:32 +0100 |
| commit | 11a441ce82d6ffecfd39b324024de0cd630b36c1 (patch) | |
| tree | c220e9954055e4c9c0c8f556811de11a56e91092 /drivers/mfd/twl4030-power.c | |
| parent | 3d8ca8c0b9fe42d005360e255fbf7a6f8580ef87 (diff) | |
| download | lwn-11a441ce82d6ffecfd39b324024de0cd630b36c1.tar.gz lwn-11a441ce82d6ffecfd39b324024de0cd630b36c1.zip | |
mfd: Introduce remove_script function for twl4030
New function twl4030_remove_script(u8 flags) takes a script type as
defined in twl.h and prevents any script already loaded in that position
from running. This is accomplished by programming SEQ_ADD_* to 0x3f,
the END_OF_SCRIPT value, where SEQ_ADD_* is determined by flags.
(Future) users of this function include OMAP board files for machines
facing a race condition between sleep and warm reset.
Signed-off-by: Mike Turquette <mturquette@ti.com>
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 | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c index 5b045ff4a2c2..7efa8789a3a2 100644 --- a/drivers/mfd/twl4030-power.c +++ b/drivers/mfd/twl4030-power.c @@ -461,6 +461,56 @@ out: return err; } +int twl4030_remove_script(u8 flags) +{ + int err = 0; + + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, R_KEY_1, + R_PROTECT_KEY); + if (err) { + pr_err("twl4030: unable to unlock PROTECT_KEY\n"); + return err; + } + + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, R_KEY_2, + R_PROTECT_KEY); + if (err) { + pr_err("twl4030: unable to unlock PROTECT_KEY\n"); + return err; + } + + if (flags & TWL4030_WRST_SCRIPT) { + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT, + R_SEQ_ADD_WARM); + if (err) + return err; + } + if (flags & TWL4030_WAKEUP12_SCRIPT) { + if (err) + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT, + R_SEQ_ADD_S2A12); + return err; + } + if (flags & TWL4030_WAKEUP3_SCRIPT) { + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT, + R_SEQ_ADD_S2A3); + if (err) + return err; + } + if (flags & TWL4030_SLEEP_SCRIPT) { + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT, + R_SEQ_ADD_A2S); + if (err) + return err; + } + + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, R_PROTECT_KEY); + if (err) + pr_err("TWL4030 Unable to relock registers\n"); + + return err; +} + void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) { int err = 0; |