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