Commit | Line | Data |
---|---|---|
01f48d30 KH |
1 | #include <linux/kernel.h> |
2 | #include <linux/init.h> | |
01f48d30 | 3 | |
4e65331c | 4 | #include "common.h" |
01f48d30 KH |
5 | |
6 | #include "voltage.h" | |
7 | #include "vp.h" | |
8 | #include "prm-regbits-34xx.h" | |
9 | #include "prm-regbits-44xx.h" | |
10 | #include "prm44xx.h" | |
11 | ||
b666b476 | 12 | static u32 _vp_set_init_voltage(struct voltagedomain *voltdm, u32 volt) |
01f48d30 | 13 | { |
b7ea803e | 14 | struct omap_vp_instance *vp = voltdm->vp; |
01f48d30 | 15 | u32 vpconfig; |
01f48d30 | 16 | char vsel; |
01f48d30 | 17 | |
b666b476 | 18 | vsel = voltdm->pmic->uv_to_vsel(volt); |
01f48d30 | 19 | |
4bcc475e | 20 | vpconfig = voltdm->read(vp->vpconfig); |
b7ea803e | 21 | vpconfig &= ~(vp->common->vpconfig_initvoltage_mask | |
b666b476 KH |
22 | vp->common->vpconfig_forceupdate | |
23 | vp->common->vpconfig_initvdd); | |
0ec3041e | 24 | vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask); |
4bcc475e | 25 | voltdm->write(vpconfig, vp->vpconfig); |
01f48d30 KH |
26 | |
27 | /* Trigger initVDD value copy to voltage processor */ | |
b7ea803e | 28 | voltdm->write((vpconfig | vp->common->vpconfig_initvdd), |
4bcc475e | 29 | vp->vpconfig); |
01f48d30 KH |
30 | |
31 | /* Clear initVDD copy trigger bit */ | |
4bcc475e | 32 | voltdm->write(vpconfig, vp->vpconfig); |
b666b476 KH |
33 | |
34 | return vpconfig; | |
01f48d30 KH |
35 | } |
36 | ||
37 | /* Generic voltage init functions */ | |
38 | void __init omap_vp_init(struct voltagedomain *voltdm) | |
39 | { | |
b7ea803e | 40 | struct omap_vp_instance *vp = voltdm->vp; |
667216d6 KH |
41 | u32 val, sys_clk_rate, timeout, waittime; |
42 | u32 vddmin, vddmax, vstepmin, vstepmax; | |
01f48d30 | 43 | |
d980e0f8 RK |
44 | if (!voltdm->pmic || !voltdm->pmic->uv_to_vsel) { |
45 | pr_err("%s: No PMIC info for vdd_%s\n", __func__, voltdm->name); | |
46 | return; | |
47 | } | |
48 | ||
4bcc475e | 49 | if (!voltdm->read || !voltdm->write) { |
01f48d30 KH |
50 | pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
51 | __func__, voltdm->name); | |
52 | return; | |
53 | } | |
54 | ||
6f567273 KH |
55 | vp->enabled = false; |
56 | ||
57 | /* Divide to avoid overflow */ | |
58 | sys_clk_rate = voltdm->sys_clk.rate / 1000; | |
59 | ||
667216d6 | 60 | timeout = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000; |
085b3025 TK |
61 | vddmin = max(voltdm->vp_param->vddmin, voltdm->pmic->vddmin); |
62 | vddmax = min(voltdm->vp_param->vddmax, voltdm->pmic->vddmax); | |
63 | vddmin = voltdm->pmic->uv_to_vsel(vddmin); | |
64 | vddmax = voltdm->pmic->uv_to_vsel(vddmax); | |
6f567273 | 65 | |
3223d007 YJ |
66 | waittime = DIV_ROUND_UP(voltdm->pmic->step_size * sys_clk_rate, |
67 | 1000 * voltdm->pmic->slew_rate); | |
667216d6 KH |
68 | vstepmin = voltdm->pmic->vp_vstepmin; |
69 | vstepmax = voltdm->pmic->vp_vstepmax; | |
70 | ||
71 | /* | |
72 | * VP_CONFIG: error gain is not set here, it will be updated | |
73 | * on each scale, based on OPP. | |
74 | */ | |
75 | val = (voltdm->pmic->vp_erroroffset << | |
76 | __ffs(voltdm->vp->common->vpconfig_erroroffset_mask)) | | |
b7ea803e | 77 | vp->common->vpconfig_timeouten; |
667216d6 KH |
78 | voltdm->write(val, vp->vpconfig); |
79 | ||
80 | /* VSTEPMIN */ | |
81 | val = (waittime << vp->common->vstepmin_smpswaittimemin_shift) | | |
82 | (vstepmin << vp->common->vstepmin_stepmin_shift); | |
83 | voltdm->write(val, vp->vstepmin); | |
84 | ||
85 | /* VSTEPMAX */ | |
86 | val = (vstepmax << vp->common->vstepmax_stepmax_shift) | | |
87 | (waittime << vp->common->vstepmax_smpswaittimemax_shift); | |
88 | voltdm->write(val, vp->vstepmax); | |
89 | ||
90 | /* VLIMITTO */ | |
91 | val = (vddmax << vp->common->vlimitto_vddmax_shift) | | |
92 | (vddmin << vp->common->vlimitto_vddmin_shift) | | |
93 | (timeout << vp->common->vlimitto_timeout_shift); | |
94 | voltdm->write(val, vp->vlimitto); | |
01f48d30 KH |
95 | } |
96 | ||
76ea7424 KH |
97 | int omap_vp_update_errorgain(struct voltagedomain *voltdm, |
98 | unsigned long target_volt) | |
99 | { | |
100 | struct omap_volt_data *volt_data; | |
101 | ||
8798c4ab KH |
102 | if (!voltdm->vp) |
103 | return -EINVAL; | |
104 | ||
76ea7424 KH |
105 | /* Get volt_data corresponding to target_volt */ |
106 | volt_data = omap_voltage_get_voltdata(voltdm, target_volt); | |
107 | if (IS_ERR(volt_data)) | |
108 | return -EINVAL; | |
109 | ||
110 | /* Setting vp errorgain based on the voltage */ | |
111 | voltdm->rmw(voltdm->vp->common->vpconfig_errorgain_mask, | |
112 | volt_data->vp_errgain << | |
113 | __ffs(voltdm->vp->common->vpconfig_errorgain_mask), | |
114 | voltdm->vp->vpconfig); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
01f48d30 KH |
119 | /* VP force update method of voltage scaling */ |
120 | int omap_vp_forceupdate_scale(struct voltagedomain *voltdm, | |
121 | unsigned long target_volt) | |
122 | { | |
b7ea803e | 123 | struct omap_vp_instance *vp = voltdm->vp; |
01f48d30 KH |
124 | u32 vpconfig; |
125 | u8 target_vsel, current_vsel; | |
126 | int ret, timeout = 0; | |
127 | ||
128 | ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, ¤t_vsel); | |
129 | if (ret) | |
130 | return ret; | |
131 | ||
132 | /* | |
133 | * Clear all pending TransactionDone interrupt/status. Typical latency | |
134 | * is <3us | |
135 | */ | |
136 | while (timeout++ < VP_TRANXDONE_TIMEOUT) { | |
b7ea803e KH |
137 | vp->common->ops->clear_txdone(vp->id); |
138 | if (!vp->common->ops->check_txdone(vp->id)) | |
01f48d30 KH |
139 | break; |
140 | udelay(1); | |
141 | } | |
142 | if (timeout >= VP_TRANXDONE_TIMEOUT) { | |
9bb05378 | 143 | pr_warn("%s: vdd_%s TRANXDONE timeout exceeded. Voltage change aborted\n", |
7852ec05 | 144 | __func__, voltdm->name); |
01f48d30 KH |
145 | return -ETIMEDOUT; |
146 | } | |
147 | ||
b666b476 | 148 | vpconfig = _vp_set_init_voltage(voltdm, target_volt); |
01f48d30 KH |
149 | |
150 | /* Force update of voltage */ | |
b666b476 KH |
151 | voltdm->write(vpconfig | vp->common->vpconfig_forceupdate, |
152 | voltdm->vp->vpconfig); | |
01f48d30 KH |
153 | |
154 | /* | |
155 | * Wait for TransactionDone. Typical latency is <200us. | |
156 | * Depends on SMPSWAITTIMEMIN/MAX and voltage change | |
157 | */ | |
158 | timeout = 0; | |
b7ea803e | 159 | omap_test_timeout(vp->common->ops->check_txdone(vp->id), |
01f48d30 KH |
160 | VP_TRANXDONE_TIMEOUT, timeout); |
161 | if (timeout >= VP_TRANXDONE_TIMEOUT) | |
7852ec05 PW |
162 | pr_err("%s: vdd_%s TRANXDONE timeout exceeded. TRANXDONE never got set after the voltage update\n", |
163 | __func__, voltdm->name); | |
01f48d30 KH |
164 | |
165 | omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel); | |
166 | ||
167 | /* | |
168 | * Disable TransactionDone interrupt , clear all status, clear | |
169 | * control registers | |
170 | */ | |
171 | timeout = 0; | |
172 | while (timeout++ < VP_TRANXDONE_TIMEOUT) { | |
b7ea803e KH |
173 | vp->common->ops->clear_txdone(vp->id); |
174 | if (!vp->common->ops->check_txdone(vp->id)) | |
01f48d30 KH |
175 | break; |
176 | udelay(1); | |
177 | } | |
178 | ||
179 | if (timeout >= VP_TRANXDONE_TIMEOUT) | |
7852ec05 | 180 | pr_warn("%s: vdd_%s TRANXDONE timeout exceeded while trying to clear the TRANXDONE status\n", |
01f48d30 KH |
181 | __func__, voltdm->name); |
182 | ||
01f48d30 | 183 | /* Clear force bit */ |
4bcc475e | 184 | voltdm->write(vpconfig, vp->vpconfig); |
01f48d30 KH |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
01f48d30 KH |
189 | /** |
190 | * omap_vp_enable() - API to enable a particular VP | |
191 | * @voltdm: pointer to the VDD whose VP is to be enabled. | |
192 | * | |
193 | * This API enables a particular voltage processor. Needed by the smartreflex | |
194 | * class drivers. | |
195 | */ | |
196 | void omap_vp_enable(struct voltagedomain *voltdm) | |
197 | { | |
b7ea803e | 198 | struct omap_vp_instance *vp; |
b666b476 | 199 | u32 vpconfig, volt; |
01f48d30 KH |
200 | |
201 | if (!voltdm || IS_ERR(voltdm)) { | |
9bb05378 | 202 | pr_warn("%s: VDD specified does not exist!\n", __func__); |
01f48d30 KH |
203 | return; |
204 | } | |
205 | ||
b7ea803e | 206 | vp = voltdm->vp; |
4bcc475e | 207 | if (!voltdm->read || !voltdm->write) { |
01f48d30 KH |
208 | pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
209 | __func__, voltdm->name); | |
210 | return; | |
211 | } | |
212 | ||
213 | /* If VP is already enabled, do nothing. Return */ | |
b7ea803e | 214 | if (vp->enabled) |
01f48d30 KH |
215 | return; |
216 | ||
b666b476 KH |
217 | volt = voltdm_get_voltage(voltdm); |
218 | if (!volt) { | |
9bb05378 NM |
219 | pr_warn("%s: unable to find current voltage for %s\n", |
220 | __func__, voltdm->name); | |
b666b476 KH |
221 | return; |
222 | } | |
223 | ||
224 | vpconfig = _vp_set_init_voltage(voltdm, volt); | |
01f48d30 KH |
225 | |
226 | /* Enable VP */ | |
b7ea803e | 227 | vpconfig |= vp->common->vpconfig_vpenable; |
4bcc475e | 228 | voltdm->write(vpconfig, vp->vpconfig); |
b666b476 | 229 | |
b7ea803e | 230 | vp->enabled = true; |
01f48d30 KH |
231 | } |
232 | ||
233 | /** | |
234 | * omap_vp_disable() - API to disable a particular VP | |
235 | * @voltdm: pointer to the VDD whose VP is to be disabled. | |
236 | * | |
237 | * This API disables a particular voltage processor. Needed by the smartreflex | |
238 | * class drivers. | |
239 | */ | |
240 | void omap_vp_disable(struct voltagedomain *voltdm) | |
241 | { | |
b7ea803e | 242 | struct omap_vp_instance *vp; |
01f48d30 KH |
243 | u32 vpconfig; |
244 | int timeout; | |
245 | ||
246 | if (!voltdm || IS_ERR(voltdm)) { | |
9bb05378 | 247 | pr_warn("%s: VDD specified does not exist!\n", __func__); |
01f48d30 KH |
248 | return; |
249 | } | |
250 | ||
b7ea803e | 251 | vp = voltdm->vp; |
4bcc475e | 252 | if (!voltdm->read || !voltdm->write) { |
01f48d30 KH |
253 | pr_err("%s: No read/write API for accessing vdd_%s regs\n", |
254 | __func__, voltdm->name); | |
255 | return; | |
256 | } | |
257 | ||
258 | /* If VP is already disabled, do nothing. Return */ | |
b7ea803e | 259 | if (!vp->enabled) { |
7852ec05 PW |
260 | pr_warn("%s: Trying to disable VP for vdd_%s when it is already disabled\n", |
261 | __func__, voltdm->name); | |
01f48d30 KH |
262 | return; |
263 | } | |
264 | ||
265 | /* Disable VP */ | |
4bcc475e | 266 | vpconfig = voltdm->read(vp->vpconfig); |
b7ea803e | 267 | vpconfig &= ~vp->common->vpconfig_vpenable; |
4bcc475e | 268 | voltdm->write(vpconfig, vp->vpconfig); |
01f48d30 KH |
269 | |
270 | /* | |
271 | * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us | |
272 | */ | |
4bcc475e KH |
273 | omap_test_timeout((voltdm->read(vp->vstatus)), |
274 | VP_IDLE_TIMEOUT, timeout); | |
01f48d30 KH |
275 | |
276 | if (timeout >= VP_IDLE_TIMEOUT) | |
9bb05378 | 277 | pr_warn("%s: vdd_%s idle timedout\n", __func__, voltdm->name); |
01f48d30 | 278 | |
b7ea803e | 279 | vp->enabled = false; |
01f48d30 KH |
280 | |
281 | return; | |
282 | } |