1 #include <linux/kernel.h>
2 #include <linux/init.h>
8 #include "prm-regbits-34xx.h"
9 #include "prm-regbits-44xx.h"
12 static u32 _vp_set_init_voltage(struct voltagedomain *voltdm, u32 volt)
14 struct omap_vp_instance *vp = voltdm->vp;
18 vsel = voltdm->pmic->uv_to_vsel(volt);
20 vpconfig = voltdm->read(vp->vpconfig);
21 vpconfig &= ~(vp->common->vpconfig_initvoltage_mask |
22 vp->common->vpconfig_forceupdate |
23 vp->common->vpconfig_initvdd);
24 vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
25 voltdm->write(vpconfig, vp->vpconfig);
27 /* Trigger initVDD value copy to voltage processor */
28 voltdm->write((vpconfig | vp->common->vpconfig_initvdd),
31 /* Clear initVDD copy trigger bit */
32 voltdm->write(vpconfig, vp->vpconfig);
37 /* Generic voltage init functions */
38 void __init omap_vp_init(struct voltagedomain *voltdm)
40 struct omap_vp_instance *vp = voltdm->vp;
41 u32 val, sys_clk_rate, timeout, waittime;
42 u32 vddmin, vddmax, vstepmin, vstepmax;
44 if (!voltdm->read || !voltdm->write) {
45 pr_err("%s: No read/write API for accessing vdd_%s regs\n",
46 __func__, voltdm->name);
52 /* Divide to avoid overflow */
53 sys_clk_rate = voltdm->sys_clk.rate / 1000;
55 timeout = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000;
56 vddmin = voltdm->pmic->vp_vddmin;
57 vddmax = voltdm->pmic->vp_vddmax;
59 waittime = ((voltdm->pmic->step_size / voltdm->pmic->slew_rate) *
61 vstepmin = voltdm->pmic->vp_vstepmin;
62 vstepmax = voltdm->pmic->vp_vstepmax;
65 * VP_CONFIG: error gain is not set here, it will be updated
66 * on each scale, based on OPP.
68 val = (voltdm->pmic->vp_erroroffset <<
69 __ffs(voltdm->vp->common->vpconfig_erroroffset_mask)) |
70 vp->common->vpconfig_timeouten;
71 voltdm->write(val, vp->vpconfig);
74 val = (waittime << vp->common->vstepmin_smpswaittimemin_shift) |
75 (vstepmin << vp->common->vstepmin_stepmin_shift);
76 voltdm->write(val, vp->vstepmin);
79 val = (vstepmax << vp->common->vstepmax_stepmax_shift) |
80 (waittime << vp->common->vstepmax_smpswaittimemax_shift);
81 voltdm->write(val, vp->vstepmax);
84 val = (vddmax << vp->common->vlimitto_vddmax_shift) |
85 (vddmin << vp->common->vlimitto_vddmin_shift) |
86 (timeout << vp->common->vlimitto_timeout_shift);
87 voltdm->write(val, vp->vlimitto);
90 int omap_vp_update_errorgain(struct voltagedomain *voltdm,
91 unsigned long target_volt)
93 struct omap_volt_data *volt_data;
98 /* Get volt_data corresponding to target_volt */
99 volt_data = omap_voltage_get_voltdata(voltdm, target_volt);
100 if (IS_ERR(volt_data))
103 /* Setting vp errorgain based on the voltage */
104 voltdm->rmw(voltdm->vp->common->vpconfig_errorgain_mask,
105 volt_data->vp_errgain <<
106 __ffs(voltdm->vp->common->vpconfig_errorgain_mask),
107 voltdm->vp->vpconfig);
112 /* VP force update method of voltage scaling */
113 int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
114 unsigned long target_volt)
116 struct omap_vp_instance *vp = voltdm->vp;
118 u8 target_vsel, current_vsel;
119 int ret, timeout = 0;
121 ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, ¤t_vsel);
126 * Clear all pending TransactionDone interrupt/status. Typical latency
129 while (timeout++ < VP_TRANXDONE_TIMEOUT) {
130 vp->common->ops->clear_txdone(vp->id);
131 if (!vp->common->ops->check_txdone(vp->id))
135 if (timeout >= VP_TRANXDONE_TIMEOUT) {
136 pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
137 "Voltage change aborted", __func__, voltdm->name);
141 vpconfig = _vp_set_init_voltage(voltdm, target_volt);
143 /* Force update of voltage */
144 voltdm->write(vpconfig | vp->common->vpconfig_forceupdate,
145 voltdm->vp->vpconfig);
148 * Wait for TransactionDone. Typical latency is <200us.
149 * Depends on SMPSWAITTIMEMIN/MAX and voltage change
152 omap_test_timeout(vp->common->ops->check_txdone(vp->id),
153 VP_TRANXDONE_TIMEOUT, timeout);
154 if (timeout >= VP_TRANXDONE_TIMEOUT)
155 pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
156 "TRANXDONE never got set after the voltage update\n",
157 __func__, voltdm->name);
159 omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel);
162 * Disable TransactionDone interrupt , clear all status, clear
166 while (timeout++ < VP_TRANXDONE_TIMEOUT) {
167 vp->common->ops->clear_txdone(vp->id);
168 if (!vp->common->ops->check_txdone(vp->id))
173 if (timeout >= VP_TRANXDONE_TIMEOUT)
174 pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
175 "to clear the TRANXDONE status\n",
176 __func__, voltdm->name);
178 /* Clear force bit */
179 voltdm->write(vpconfig, vp->vpconfig);
185 * omap_vp_enable() - API to enable a particular VP
186 * @voltdm: pointer to the VDD whose VP is to be enabled.
188 * This API enables a particular voltage processor. Needed by the smartreflex
191 void omap_vp_enable(struct voltagedomain *voltdm)
193 struct omap_vp_instance *vp;
196 if (!voltdm || IS_ERR(voltdm)) {
197 pr_warning("%s: VDD specified does not exist!\n", __func__);
202 if (!voltdm->read || !voltdm->write) {
203 pr_err("%s: No read/write API for accessing vdd_%s regs\n",
204 __func__, voltdm->name);
208 /* If VP is already enabled, do nothing. Return */
212 volt = voltdm_get_voltage(voltdm);
214 pr_warning("%s: unable to find current voltage for %s\n",
215 __func__, voltdm->name);
219 vpconfig = _vp_set_init_voltage(voltdm, volt);
222 vpconfig |= vp->common->vpconfig_vpenable;
223 voltdm->write(vpconfig, vp->vpconfig);
229 * omap_vp_disable() - API to disable a particular VP
230 * @voltdm: pointer to the VDD whose VP is to be disabled.
232 * This API disables a particular voltage processor. Needed by the smartreflex
235 void omap_vp_disable(struct voltagedomain *voltdm)
237 struct omap_vp_instance *vp;
241 if (!voltdm || IS_ERR(voltdm)) {
242 pr_warning("%s: VDD specified does not exist!\n", __func__);
247 if (!voltdm->read || !voltdm->write) {
248 pr_err("%s: No read/write API for accessing vdd_%s regs\n",
249 __func__, voltdm->name);
253 /* If VP is already disabled, do nothing. Return */
255 pr_warning("%s: Trying to disable VP for vdd_%s when"
256 "it is already disabled\n", __func__, voltdm->name);
261 vpconfig = voltdm->read(vp->vpconfig);
262 vpconfig &= ~vp->common->vpconfig_vpenable;
263 voltdm->write(vpconfig, vp->vpconfig);
266 * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
268 omap_test_timeout((voltdm->read(vp->vstatus)),
269 VP_IDLE_TIMEOUT, timeout);
271 if (timeout >= VP_IDLE_TIMEOUT)
272 pr_warning("%s: vdd_%s idle timedout\n",
273 __func__, voltdm->name);