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mfd: hwacc power state db8500-prcmu accessor

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This implements the accessor function for hardware accelerator
power state settings.

Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Bengt Jonsson 2011-08-12 10:28:25 +02:00 committed by Samuel Ortiz
parent 0837bb7260
commit 0b9199e318
1 changed files with 126 additions and 0 deletions
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126
drivers/mfd/db8500-prcmu.c
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@ -1080,6 +1080,132 @@ static int request_pll(u8 clock, bool enable)
return r;
}
/**
* prcmu_set_hwacc - set the power state of a h/w accelerator
* @hwacc_dev: The hardware accelerator (enum hw_acc_dev).
* @state: The new power state (enum hw_acc_state).
*
* This function sets the power state of a hardware accelerator.
* This function should not be called from interrupt context.
*
* NOTE! Deprecated, to be removed when all users switched over to use the
* regulator framework API.
*/
int prcmu_set_hwacc(u16 hwacc_dev, u8 state)
{
int r = 0;
bool ram_retention = false;
bool enable, enable_ret;
/* check argument */
BUG_ON(hwacc_dev >= NUM_HW_ACC);
/* get state of switches */
enable = hwacc_enabled[hwacc_dev];
enable_ret = hwacc_ret_enabled[hwacc_dev];
/* set flag if retention is possible */
switch (hwacc_dev) {
case HW_ACC_SVAMMDSP:
case HW_ACC_SIAMMDSP:
case HW_ACC_ESRAM1:
case HW_ACC_ESRAM2:
case HW_ACC_ESRAM3:
case HW_ACC_ESRAM4:
ram_retention = true;
break;
}
/* check argument */
BUG_ON(state > HW_ON);
BUG_ON(state == HW_OFF_RAMRET && !ram_retention);
/* modify enable flags */
switch (state) {
case HW_OFF:
enable_ret = false;
enable = false;
break;
case HW_ON:
enable = true;
break;
case HW_OFF_RAMRET:
enable_ret = true;
enable = false;
break;
}
/* get regulator (lazy) */
if (hwacc_regulator[hwacc_dev] == NULL) {
hwacc_regulator[hwacc_dev] = regulator_get(NULL,
hwacc_regulator_name[hwacc_dev]);
if (IS_ERR(hwacc_regulator[hwacc_dev])) {
pr_err("prcmu: failed to get supply %s\n",
hwacc_regulator_name[hwacc_dev]);
r = PTR_ERR(hwacc_regulator[hwacc_dev]);
goto out;
}
}
if (ram_retention) {
if (hwacc_ret_regulator[hwacc_dev] == NULL) {
hwacc_ret_regulator[hwacc_dev] = regulator_get(NULL,
hwacc_ret_regulator_name[hwacc_dev]);
if (IS_ERR(hwacc_ret_regulator[hwacc_dev])) {
pr_err("prcmu: failed to get supply %s\n",
hwacc_ret_regulator_name[hwacc_dev]);
r = PTR_ERR(hwacc_ret_regulator[hwacc_dev]);
goto out;
}
}
}
/* set regulators */
if (ram_retention) {
if (enable_ret && !hwacc_ret_enabled[hwacc_dev]) {
r = regulator_enable(hwacc_ret_regulator[hwacc_dev]);
if (r < 0) {
pr_err("prcmu_set_hwacc: ret enable failed\n");
goto out;
}
hwacc_ret_enabled[hwacc_dev] = true;
}
}
if (enable && !hwacc_enabled[hwacc_dev]) {
r = regulator_enable(hwacc_regulator[hwacc_dev]);
if (r < 0) {
pr_err("prcmu_set_hwacc: enable failed\n");
goto out;
}
hwacc_enabled[hwacc_dev] = true;
}
if (!enable && hwacc_enabled[hwacc_dev]) {
r = regulator_disable(hwacc_regulator[hwacc_dev]);
if (r < 0) {
pr_err("prcmu_set_hwacc: disable failed\n");
goto out;
}
hwacc_enabled[hwacc_dev] = false;
}
if (ram_retention) {
if (!enable_ret && hwacc_ret_enabled[hwacc_dev]) {
r = regulator_disable(hwacc_ret_regulator[hwacc_dev]);
if (r < 0) {
pr_err("prcmu_set_hwacc: ret disable failed\n");
goto out;
}
hwacc_ret_enabled[hwacc_dev] = false;
}
}
out:
return r;
}
EXPORT_SYMBOL(prcmu_set_hwacc);
/**
* db8500_prcmu_set_epod - set the state of a EPOD (power domain)
* @epod_id: The EPOD to set