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authorIgor Grinberg <grinberg@compulab.co.il>2011-11-13 11:49:50 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2012-01-09 00:37:40 +0100
commit26cc3ab984cd00e95cb58ba5aaea4238ea56c700 (patch)
tree472a56db7678b50e3d6bba59c2f04a09e40635be /drivers/mfd/twl4030-power.c
parentaeb5032b3f8b9ab69daa545777433fa94b3494c4 (diff)
downloadlinux-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.c42
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)