283 lines
7.4 KiB
C
283 lines
7.4 KiB
C
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include "common.h"
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#include "voltage.h"
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#include "vp.h"
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#include "prm-regbits-34xx.h"
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#include "prm-regbits-44xx.h"
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#include "prm44xx.h"
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static u32 _vp_set_init_voltage(struct voltagedomain *voltdm, u32 volt)
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{
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struct omap_vp_instance *vp = voltdm->vp;
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u32 vpconfig;
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char vsel;
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vsel = voltdm->pmic->uv_to_vsel(volt);
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vpconfig = voltdm->read(vp->vpconfig);
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vpconfig &= ~(vp->common->vpconfig_initvoltage_mask |
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vp->common->vpconfig_forceupdate |
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vp->common->vpconfig_initvdd);
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vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
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voltdm->write(vpconfig, vp->vpconfig);
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/* Trigger initVDD value copy to voltage processor */
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voltdm->write((vpconfig | vp->common->vpconfig_initvdd),
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vp->vpconfig);
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/* Clear initVDD copy trigger bit */
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voltdm->write(vpconfig, vp->vpconfig);
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return vpconfig;
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}
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/* Generic voltage init functions */
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void __init omap_vp_init(struct voltagedomain *voltdm)
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{
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struct omap_vp_instance *vp = voltdm->vp;
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u32 val, sys_clk_rate, timeout, waittime;
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u32 vddmin, vddmax, vstepmin, vstepmax;
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if (!voltdm->pmic || !voltdm->pmic->uv_to_vsel) {
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pr_err("%s: No PMIC info for vdd_%s\n", __func__, voltdm->name);
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return;
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}
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if (!voltdm->read || !voltdm->write) {
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pr_err("%s: No read/write API for accessing vdd_%s regs\n",
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__func__, voltdm->name);
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return;
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}
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vp->enabled = false;
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/* Divide to avoid overflow */
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sys_clk_rate = voltdm->sys_clk.rate / 1000;
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timeout = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000;
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vddmin = max(voltdm->vp_param->vddmin, voltdm->pmic->vddmin);
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vddmax = min(voltdm->vp_param->vddmax, voltdm->pmic->vddmax);
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vddmin = voltdm->pmic->uv_to_vsel(vddmin);
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vddmax = voltdm->pmic->uv_to_vsel(vddmax);
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waittime = DIV_ROUND_UP(voltdm->pmic->step_size * sys_clk_rate,
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1000 * voltdm->pmic->slew_rate);
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vstepmin = voltdm->pmic->vp_vstepmin;
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vstepmax = voltdm->pmic->vp_vstepmax;
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/*
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* VP_CONFIG: error gain is not set here, it will be updated
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* on each scale, based on OPP.
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*/
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val = (voltdm->pmic->vp_erroroffset <<
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__ffs(voltdm->vp->common->vpconfig_erroroffset_mask)) |
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vp->common->vpconfig_timeouten;
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voltdm->write(val, vp->vpconfig);
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/* VSTEPMIN */
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val = (waittime << vp->common->vstepmin_smpswaittimemin_shift) |
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(vstepmin << vp->common->vstepmin_stepmin_shift);
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voltdm->write(val, vp->vstepmin);
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/* VSTEPMAX */
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val = (vstepmax << vp->common->vstepmax_stepmax_shift) |
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(waittime << vp->common->vstepmax_smpswaittimemax_shift);
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voltdm->write(val, vp->vstepmax);
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/* VLIMITTO */
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val = (vddmax << vp->common->vlimitto_vddmax_shift) |
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(vddmin << vp->common->vlimitto_vddmin_shift) |
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(timeout << vp->common->vlimitto_timeout_shift);
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voltdm->write(val, vp->vlimitto);
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}
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int omap_vp_update_errorgain(struct voltagedomain *voltdm,
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unsigned long target_volt)
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{
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struct omap_volt_data *volt_data;
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if (!voltdm->vp)
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return -EINVAL;
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/* Get volt_data corresponding to target_volt */
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volt_data = omap_voltage_get_voltdata(voltdm, target_volt);
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if (IS_ERR(volt_data))
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return -EINVAL;
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/* Setting vp errorgain based on the voltage */
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voltdm->rmw(voltdm->vp->common->vpconfig_errorgain_mask,
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volt_data->vp_errgain <<
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__ffs(voltdm->vp->common->vpconfig_errorgain_mask),
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voltdm->vp->vpconfig);
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return 0;
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}
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/* VP force update method of voltage scaling */
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int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
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unsigned long target_volt)
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{
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struct omap_vp_instance *vp = voltdm->vp;
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u32 vpconfig;
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u8 target_vsel, current_vsel;
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int ret, timeout = 0;
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ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, ¤t_vsel);
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if (ret)
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return ret;
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/*
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* Clear all pending TransactionDone interrupt/status. Typical latency
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* is <3us
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*/
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while (timeout++ < VP_TRANXDONE_TIMEOUT) {
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vp->common->ops->clear_txdone(vp->id);
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if (!vp->common->ops->check_txdone(vp->id))
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break;
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udelay(1);
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}
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if (timeout >= VP_TRANXDONE_TIMEOUT) {
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pr_warn("%s: vdd_%s TRANXDONE timeout exceeded. Voltage change aborted\n",
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__func__, voltdm->name);
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return -ETIMEDOUT;
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}
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vpconfig = _vp_set_init_voltage(voltdm, target_volt);
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/* Force update of voltage */
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voltdm->write(vpconfig | vp->common->vpconfig_forceupdate,
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voltdm->vp->vpconfig);
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/*
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* Wait for TransactionDone. Typical latency is <200us.
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* Depends on SMPSWAITTIMEMIN/MAX and voltage change
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*/
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timeout = 0;
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omap_test_timeout(vp->common->ops->check_txdone(vp->id),
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VP_TRANXDONE_TIMEOUT, timeout);
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if (timeout >= VP_TRANXDONE_TIMEOUT)
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pr_err("%s: vdd_%s TRANXDONE timeout exceeded. TRANXDONE never got set after the voltage update\n",
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__func__, voltdm->name);
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omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel);
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/*
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* Disable TransactionDone interrupt , clear all status, clear
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* control registers
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*/
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timeout = 0;
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while (timeout++ < VP_TRANXDONE_TIMEOUT) {
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vp->common->ops->clear_txdone(vp->id);
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if (!vp->common->ops->check_txdone(vp->id))
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break;
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udelay(1);
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}
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if (timeout >= VP_TRANXDONE_TIMEOUT)
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pr_warn("%s: vdd_%s TRANXDONE timeout exceeded while trying to clear the TRANXDONE status\n",
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__func__, voltdm->name);
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/* Clear force bit */
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voltdm->write(vpconfig, vp->vpconfig);
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return 0;
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}
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/**
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* omap_vp_enable() - API to enable a particular VP
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* @voltdm: pointer to the VDD whose VP is to be enabled.
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*
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* This API enables a particular voltage processor. Needed by the smartreflex
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* class drivers.
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*/
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void omap_vp_enable(struct voltagedomain *voltdm)
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{
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struct omap_vp_instance *vp;
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u32 vpconfig, volt;
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return;
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}
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vp = voltdm->vp;
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if (!voltdm->read || !voltdm->write) {
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pr_err("%s: No read/write API for accessing vdd_%s regs\n",
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__func__, voltdm->name);
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return;
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}
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/* If VP is already enabled, do nothing. Return */
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if (vp->enabled)
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return;
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volt = voltdm_get_voltage(voltdm);
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if (!volt) {
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pr_warn("%s: unable to find current voltage for %s\n",
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__func__, voltdm->name);
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return;
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}
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vpconfig = _vp_set_init_voltage(voltdm, volt);
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/* Enable VP */
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vpconfig |= vp->common->vpconfig_vpenable;
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voltdm->write(vpconfig, vp->vpconfig);
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vp->enabled = true;
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}
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/**
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* omap_vp_disable() - API to disable a particular VP
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* @voltdm: pointer to the VDD whose VP is to be disabled.
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*
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* This API disables a particular voltage processor. Needed by the smartreflex
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* class drivers.
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*/
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void omap_vp_disable(struct voltagedomain *voltdm)
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{
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struct omap_vp_instance *vp;
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u32 vpconfig;
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int timeout;
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if (!voltdm || IS_ERR(voltdm)) {
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pr_warn("%s: VDD specified does not exist!\n", __func__);
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return;
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}
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vp = voltdm->vp;
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if (!voltdm->read || !voltdm->write) {
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pr_err("%s: No read/write API for accessing vdd_%s regs\n",
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__func__, voltdm->name);
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return;
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}
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/* If VP is already disabled, do nothing. Return */
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if (!vp->enabled) {
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pr_warn("%s: Trying to disable VP for vdd_%s when it is already disabled\n",
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__func__, voltdm->name);
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return;
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}
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/* Disable VP */
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vpconfig = voltdm->read(vp->vpconfig);
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vpconfig &= ~vp->common->vpconfig_vpenable;
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voltdm->write(vpconfig, vp->vpconfig);
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/*
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* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
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*/
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omap_test_timeout((voltdm->read(vp->vstatus)),
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VP_IDLE_TIMEOUT, timeout);
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if (timeout >= VP_IDLE_TIMEOUT)
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pr_warn("%s: vdd_%s idle timedout\n", __func__, voltdm->name);
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vp->enabled = false;
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return;
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}
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