/**
* omap_vp_enable() - API to enable a particular VP
* @voltdm: pointer to the VDD whose VP is to be enabled.
*
* This API enables a particular voltage processor. Needed by the smartreflex
* class drivers.
*/
void omap_vp_enable(struct voltagedomain *voltdm)
{
struct omap_vp_instance *vp;
u32 vpconfig;
struct omap_volt_data *volt;
if (IS_ERR_OR_NULL(voltdm)) {
pr_err("%s: VDD specified does not exist!\n", __func__);
return;
}
vp = voltdm->vp;
if (IS_ERR_OR_NULL(vp)) {
pr_err("%s: No VP info for vdd_%s\n", __func__, voltdm->name);
return;
}
if (!voltdm->read || !voltdm->write) {
pr_err("%s: No read/write API for accessing vdd_%s regs\n",
__func__, voltdm->name);
return;
}
/* If VP is already enabled, do nothing. Return */
if (vp->enabled)
return;
volt = omap_voltage_get_curr_vdata(voltdm);
if (!volt) {
pr_warning("%s: unable to find current voltage for %s\n",
__func__, voltdm->name);
return;
}
vpconfig = _vp_set_init_voltage(voltdm,
omap_get_operation_voltage(volt));
/* Enable VP */
vpconfig |= vp->common->vpconfig_vpenable;
voltdm->write(vpconfig, vp->vpconfig);
vp->enabled = true;
}
static void vp_latch_vsel(struct voltagedomain *voltdm)
{
struct omap_vp_instance *vp = voltdm->vp;
struct omap_volt_data *v = omap_voltage_get_curr_vdata(voltdm);
u32 vpconfig;
unsigned long uvdc;
char vsel;
if (IS_ERR_OR_NULL(v)) {
pr_warning("%s: unable to get voltage for vdd_%s\n",
__func__, voltdm->name);
return;
}
uvdc = omap_get_operation_voltage(v);
if (!uvdc) {
pr_warning("%s: unable to find current voltage for vdd_%s\n",
__func__, voltdm->name);
return;
}
if (!voltdm->pmic || !voltdm->pmic->uv_to_vsel) {
pr_warning("%s: PMIC function to convert voltage in uV to"
" vsel not registered\n", __func__);
return;
}
vsel = voltdm->pmic->uv_to_vsel(uvdc);
vpconfig = voltdm->read(vp->vpconfig);
vpconfig &= ~(vp->common->vpconfig_initvoltage_mask |
vp->common->vpconfig_initvdd);
vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
voltdm->write(vpconfig, vp->vpconfig);
/* Trigger initVDD value copy to voltage processor */
voltdm->write((vpconfig | vp->common->vpconfig_initvdd),
vp->vpconfig);
/* Clear initVDD copy trigger bit */
voltdm->write(vpconfig, vp->vpconfig);
}
/* VP force update method of voltage scaling */
int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
struct omap_volt_data *target_v)
{
struct omap_vp_instance *vp = voltdm->vp;
u32 vpconfig;
u8 target_vsel, current_vsel;
int ret, timeout = 0;
unsigned long target_volt = omap_get_operation_voltage(target_v);
/*
* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
* This is an additional allowance to ensure we are in proper state
* to enter into forceupdate state transition.
*/
omap_test_timeout((voltdm->read(vp->vstatus) & vp->common->vstatus_vpidle),
VP_IDLE_TIMEOUT, timeout);
if (timeout >= VP_IDLE_TIMEOUT)
_vp_controlled_err(vp, voltdm,
"%s:vdd_%s idletimdout forceupdate(v=%ld)\n",
__func__, voltdm->name, target_volt);
ret = omap_vc_pre_scale(voltdm, target_volt, target_v,
&target_vsel, ¤t_vsel);
if (ret)
return ret;
/*
* Clear all pending TransactionDone interrupt/status. Typical latency
* is <3us
*/
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vp->common->ops->clear_txdone(vp->id);
if (!vp->common->ops->check_txdone(vp->id))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT) {
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded."
"Voltage change aborted target volt=%ld,"
"target vsel=0x%02x, current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
return -ETIMEDOUT;
}
/* Configure for VP-Force Update */
vpconfig = voltdm->read(vp->vpconfig);
vpconfig &= ~(vp->common->vpconfig_initvdd |
vp->common->vpconfig_forceupdate |
vp->common->vpconfig_initvoltage_mask);
vpconfig |= ((target_vsel <<
__ffs(vp->common->vpconfig_initvoltage_mask)));
voltdm->write(vpconfig, vp->vpconfig);
/* Trigger initVDD value copy to voltage processor */
vpconfig |= vp->common->vpconfig_initvdd;
voltdm->write(vpconfig, vp->vpconfig);
/* Force update of voltage */
vpconfig |= vp->common->vpconfig_forceupdate;
voltdm->write(vpconfig, vp->vpconfig);
/*
* Wait for TransactionDone. Typical latency is <200us.
* Depends on SMPSWAITTIMEMIN/MAX and voltage change
*/
timeout = 0;
omap_test_timeout(vp->common->ops->check_txdone(vp->id),
VP_TRANXDONE_TIMEOUT, timeout);
if (timeout >= VP_TRANXDONE_TIMEOUT)
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded. "
"TRANXDONE never got set after the voltage update. "
"target volt=%ld, target vsel=0x%02x, "
"current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
omap_vc_post_scale(voltdm, target_volt, target_v,
target_vsel, current_vsel);
/*
* Disable TransactionDone interrupt , clear all status, clear
* control registers
*/
timeout = 0;
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vp->common->ops->clear_txdone(vp->id);
if (!vp->common->ops->check_txdone(vp->id))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT)
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded while"
"trying to clear the TRANXDONE status. target volt=%ld,"
"target vsel=0x%02x, current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
vpconfig = voltdm->read(vp->vpconfig);
/* Clear initVDD copy trigger bit */
vpconfig &= ~vp->common->vpconfig_initvdd;
voltdm->write(vpconfig, vp->vpconfig);
/* Clear force bit */
vpconfig &= ~vp->common->vpconfig_forceupdate;
voltdm->write(vpconfig, vp->vpconfig);
return 0;
}
/* VP force update method of voltage scaling */
int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
struct omap_volt_data *target_v)
{
struct omap_vp_instance *vp;
u32 vpconfig;
u8 target_vsel, current_vsel;
int ret, timeout = 0;
unsigned long target_volt;
if (IS_ERR_OR_NULL(voltdm)) {
pr_err("%s: VDD specified does not exist!\n", __func__);
return -EINVAL;
}
if (IS_ERR_OR_NULL(voltdm->write)) {
pr_err("%s: No write API for writing vdd_%s regs\n",
__func__, voltdm->name);
return -EINVAL;
}
if (IS_ERR_OR_NULL(target_v)) {
pr_err("%s: No target_v info to scale vdd_%s\n",
__func__, voltdm->name);
return -EINVAL;
}
vp = voltdm->vp;
if (IS_ERR_OR_NULL(vp)) {
pr_err("%s: No VP info for vdd_%s\n", __func__, voltdm->name);
return -EINVAL;
}
target_volt = omap_get_operation_voltage(target_v);
ret = _vp_wait_for_idle(voltdm, vp);
if (ret) {
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s idle timedout (v=%ld)\n",
__func__, voltdm->name, target_volt);
return ret;
}
ret = omap_vc_pre_scale(voltdm, target_volt, target_v,
&target_vsel, ¤t_vsel);
if (ret)
return ret;
/*
* Clear all pending TransactionDone interrupt/status. Typical latency
* is <3us
*/
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vp->common->ops->clear_txdone(vp->id);
if (!vp->common->ops->check_txdone(vp->id))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT) {
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded."
"Voltage change aborted target volt=%ld,"
"target vsel=0x%02x, current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
return -ETIMEDOUT;
}
vpconfig = _vp_set_init_voltage(voltdm, target_volt);
/* Force update of voltage */
voltdm->write(vpconfig | vp->common->vpconfig_forceupdate,
voltdm->vp->vpconfig);
/*
* Wait for TransactionDone. Typical latency is <200us.
* Depends on SMPSWAITTIMEMIN/MAX and voltage change
*/
timeout = 0;
omap_test_timeout(vp->common->ops->check_txdone(vp->id),
VP_TRANXDONE_TIMEOUT, timeout);
if (timeout >= VP_TRANXDONE_TIMEOUT)
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded. "
"TRANXDONE never got set after the voltage update. "
"target volt=%ld, target vsel=0x%02x, "
"current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
omap_vc_post_scale(voltdm, target_volt, target_v,
target_vsel, current_vsel);
/*
* Disable TransactionDone interrupt , clear all status, clear
* control registers
*/
timeout = 0;
while (timeout++ < VP_TRANXDONE_TIMEOUT) {
vp->common->ops->clear_txdone(vp->id);
if (!vp->common->ops->check_txdone(vp->id))
break;
udelay(1);
}
if (timeout >= VP_TRANXDONE_TIMEOUT)
_vp_controlled_err(vp, voltdm,
"%s: vdd_%s TRANXDONE timeout exceeded while"
"trying to clear the TRANXDONE status. target volt=%ld,"
"target vsel=0x%02x, current_vsel=0x%02x\n",
__func__, voltdm->name, target_volt,
target_vsel, current_vsel);
/* Clear force bit */
voltdm->write(vpconfig, vp->vpconfig);
return 0;
}
