Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 1 | /* |
| 2 | * OMAP3/OMAP4 Voltage Management Routines |
| 3 | * |
| 4 | * Author: Thara Gopinath <thara@ti.com> |
| 5 | * |
| 6 | * Copyright (C) 2007 Texas Instruments, Inc. |
| 7 | * Rajendra Nayak <rnayak@ti.com> |
| 8 | * Lesly A M <x0080970@ti.com> |
| 9 | * |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 10 | * Copyright (C) 2008, 2011 Nokia Corporation |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 11 | * Kalle Jokiniemi |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 12 | * Paul Walmsley |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 13 | * |
| 14 | * Copyright (C) 2010 Texas Instruments, Inc. |
| 15 | * Thara Gopinath <thara@ti.com> |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or modify |
| 18 | * it under the terms of the GNU General Public License version 2 as |
| 19 | * published by the Free Software Foundation. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/io.h> |
| 24 | #include <linux/clk.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/debugfs.h> |
| 27 | #include <linux/slab.h> |
| 28 | |
| 29 | #include <plat/common.h> |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 30 | |
| 31 | #include "prm-regbits-34xx.h" |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 32 | #include "prm-regbits-44xx.h" |
| 33 | #include "prm44xx.h" |
| 34 | #include "prcm44xx.h" |
| 35 | #include "prminst44xx.h" |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 36 | #include "control.h" |
| 37 | |
Paul Walmsley | e1d6f47 | 2011-02-25 15:54:33 -0700 | [diff] [blame] | 38 | #include "voltage.h" |
Kevin Hilman | e69c22b | 2011-03-16 16:13:15 -0700 | [diff] [blame] | 39 | #include "powerdomain.h" |
Paul Walmsley | e1d6f47 | 2011-02-25 15:54:33 -0700 | [diff] [blame] | 40 | |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 41 | #include "vc.h" |
| 42 | #include "vp.h" |
| 43 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 44 | static LIST_HEAD(voltdm_list); |
| 45 | |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 46 | #define VOLTAGE_DIR_SIZE 16 |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 47 | static struct dentry *voltage_dir; |
| 48 | |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 49 | static u32 omap3_voltage_read_reg(u16 mod, u8 offset) |
| 50 | { |
| 51 | return omap2_prm_read_mod_reg(mod, offset); |
| 52 | } |
| 53 | |
| 54 | static void omap3_voltage_write_reg(u32 val, u16 mod, u8 offset) |
| 55 | { |
| 56 | omap2_prm_write_mod_reg(val, mod, offset); |
| 57 | } |
| 58 | |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 59 | static u32 omap4_voltage_read_reg(u16 mod, u8 offset) |
| 60 | { |
| 61 | return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, |
| 62 | mod, offset); |
| 63 | } |
| 64 | |
| 65 | static void omap4_voltage_write_reg(u32 val, u16 mod, u8 offset) |
| 66 | { |
| 67 | omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION, mod, offset); |
| 68 | } |
| 69 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 70 | static int __init _config_common_vdd_data(struct voltagedomain *voltdm) |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 71 | { |
| 72 | char *sys_ck_name; |
| 73 | struct clk *sys_ck; |
| 74 | u32 sys_clk_speed, timeout_val, waittime; |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 75 | struct omap_vdd_info *vdd = voltdm->vdd; |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 76 | |
| 77 | /* |
| 78 | * XXX Clockfw should handle this, or this should be in a |
| 79 | * struct record |
| 80 | */ |
| 81 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
| 82 | sys_ck_name = "sys_ck"; |
| 83 | else if (cpu_is_omap44xx()) |
| 84 | sys_ck_name = "sys_clkin_ck"; |
| 85 | else |
| 86 | return -EINVAL; |
| 87 | |
| 88 | /* |
| 89 | * Sys clk rate is require to calculate vp timeout value and |
| 90 | * smpswaittimemin and smpswaittimemax. |
| 91 | */ |
| 92 | sys_ck = clk_get(NULL, sys_ck_name); |
| 93 | if (IS_ERR(sys_ck)) { |
| 94 | pr_warning("%s: Could not get the sys clk to calculate" |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 95 | "various vdd_%s params\n", __func__, voltdm->name); |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 96 | return -EINVAL; |
| 97 | } |
| 98 | sys_clk_speed = clk_get_rate(sys_ck); |
| 99 | clk_put(sys_ck); |
| 100 | /* Divide to avoid overflow */ |
| 101 | sys_clk_speed /= 1000; |
| 102 | |
| 103 | /* Generic voltage parameters */ |
Kevin Hilman | 01f48d3 | 2011-03-21 14:29:13 -0700 | [diff] [blame^] | 104 | vdd->volt_scale = omap_vp_forceupdate_scale; |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 105 | vdd->vp_enabled = false; |
| 106 | |
| 107 | vdd->vp_rt_data.vpconfig_erroroffset = |
| 108 | (vdd->pmic_info->vp_erroroffset << |
| 109 | vdd->vp_data->vp_common->vpconfig_erroroffset_shift); |
| 110 | |
| 111 | timeout_val = (sys_clk_speed * vdd->pmic_info->vp_timeout_us) / 1000; |
| 112 | vdd->vp_rt_data.vlimitto_timeout = timeout_val; |
| 113 | vdd->vp_rt_data.vlimitto_vddmin = vdd->pmic_info->vp_vddmin; |
| 114 | vdd->vp_rt_data.vlimitto_vddmax = vdd->pmic_info->vp_vddmax; |
| 115 | |
| 116 | waittime = ((vdd->pmic_info->step_size / vdd->pmic_info->slew_rate) * |
| 117 | sys_clk_speed) / 1000; |
| 118 | vdd->vp_rt_data.vstepmin_smpswaittimemin = waittime; |
| 119 | vdd->vp_rt_data.vstepmax_smpswaittimemax = waittime; |
| 120 | vdd->vp_rt_data.vstepmin_stepmin = vdd->pmic_info->vp_vstepmin; |
| 121 | vdd->vp_rt_data.vstepmax_stepmax = vdd->pmic_info->vp_vstepmax; |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 126 | static int nom_volt_debug_get(void *data, u64 *val) |
| 127 | { |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 128 | struct voltagedomain *voltdm = (struct voltagedomain *)data; |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 129 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 130 | if (!voltdm) { |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 131 | pr_warning("Wrong paramater passed\n"); |
| 132 | return -EINVAL; |
| 133 | } |
| 134 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 135 | *val = omap_voltage_get_nom_volt(voltdm); |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 140 | DEFINE_SIMPLE_ATTRIBUTE(nom_volt_debug_fops, nom_volt_debug_get, NULL, |
| 141 | "%llu\n"); |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 142 | static void __init vdd_debugfs_init(struct voltagedomain *voltdm) |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 143 | { |
| 144 | char *name; |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 145 | struct omap_vdd_info *vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 146 | |
| 147 | name = kzalloc(VOLTAGE_DIR_SIZE, GFP_KERNEL); |
| 148 | if (!name) { |
| 149 | pr_warning("%s: Unable to allocate memory for debugfs" |
| 150 | " directory name for vdd_%s", |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 151 | __func__, voltdm->name); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 152 | return; |
| 153 | } |
| 154 | strcpy(name, "vdd_"); |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 155 | strcat(name, voltdm->name); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 156 | |
| 157 | vdd->debug_dir = debugfs_create_dir(name, voltage_dir); |
Aaro Koskinen | 6227011 | 2011-01-28 18:24:11 +0200 | [diff] [blame] | 158 | kfree(name); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 159 | if (IS_ERR(vdd->debug_dir)) { |
| 160 | pr_warning("%s: Unable to create debugfs directory for" |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 161 | " vdd_%s\n", __func__, voltdm->name); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 162 | vdd->debug_dir = NULL; |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 163 | return; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 164 | } |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 165 | |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 166 | (void) debugfs_create_file("curr_nominal_volt", S_IRUGO, |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 167 | vdd->debug_dir, (void *) voltdm, |
Thara Gopinath | 077fcec | 2010-10-27 20:29:37 +0530 | [diff] [blame] | 168 | &nom_volt_debug_fops); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 169 | } |
| 170 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 171 | static int __init omap_vdd_data_configure(struct voltagedomain *voltdm) |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 172 | { |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 173 | struct omap_vdd_info *vdd = voltdm->vdd; |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 174 | int ret = -EINVAL; |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 175 | |
| 176 | if (!vdd->pmic_info) { |
| 177 | pr_err("%s: PMIC info requried to configure vdd_%s not" |
| 178 | "populated.Hence cannot initialize vdd_%s\n", |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 179 | __func__, voltdm->name, voltdm->name); |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 180 | goto ovdc_out; |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 181 | } |
| 182 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 183 | if (IS_ERR_VALUE(_config_common_vdd_data(voltdm))) |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 184 | goto ovdc_out; |
| 185 | |
| 186 | if (cpu_is_omap34xx()) { |
| 187 | vdd->read_reg = omap3_voltage_read_reg; |
| 188 | vdd->write_reg = omap3_voltage_write_reg; |
| 189 | ret = 0; |
| 190 | } else if (cpu_is_omap44xx()) { |
| 191 | vdd->read_reg = omap4_voltage_read_reg; |
| 192 | vdd->write_reg = omap4_voltage_write_reg; |
| 193 | ret = 0; |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 194 | } |
| 195 | |
Paul Walmsley | c0718df | 2011-03-10 22:17:45 -0700 | [diff] [blame] | 196 | ovdc_out: |
| 197 | return ret; |
Thara Gopinath | bd38107 | 2010-12-10 23:15:23 +0530 | [diff] [blame] | 198 | } |
| 199 | |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 200 | /* Public functions */ |
| 201 | /** |
| 202 | * omap_voltage_get_nom_volt() - Gets the current non-auto-compensated voltage |
| 203 | * @voltdm: pointer to the VDD for which current voltage info is needed |
| 204 | * |
| 205 | * API to get the current non-auto-compensated voltage for a VDD. |
| 206 | * Returns 0 in case of error else returns the current voltage for the VDD. |
| 207 | */ |
| 208 | unsigned long omap_voltage_get_nom_volt(struct voltagedomain *voltdm) |
| 209 | { |
| 210 | struct omap_vdd_info *vdd; |
| 211 | |
| 212 | if (!voltdm || IS_ERR(voltdm)) { |
| 213 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 214 | return 0; |
| 215 | } |
| 216 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 217 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 218 | |
| 219 | return vdd->curr_volt; |
| 220 | } |
| 221 | |
| 222 | /** |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 223 | * omap_voltage_scale_vdd() - API to scale voltage of a particular |
| 224 | * voltage domain. |
| 225 | * @voltdm: pointer to the VDD which is to be scaled. |
| 226 | * @target_volt: The target voltage of the voltage domain |
| 227 | * |
| 228 | * This API should be called by the kernel to do the voltage scaling |
| 229 | * for a particular voltage domain during dvfs or any other situation. |
| 230 | */ |
| 231 | int omap_voltage_scale_vdd(struct voltagedomain *voltdm, |
| 232 | unsigned long target_volt) |
| 233 | { |
| 234 | struct omap_vdd_info *vdd; |
| 235 | |
| 236 | if (!voltdm || IS_ERR(voltdm)) { |
| 237 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 238 | return -EINVAL; |
| 239 | } |
| 240 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 241 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 242 | |
| 243 | if (!vdd->volt_scale) { |
| 244 | pr_err("%s: No voltage scale API registered for vdd_%s\n", |
| 245 | __func__, voltdm->name); |
| 246 | return -ENODATA; |
| 247 | } |
| 248 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 249 | return vdd->volt_scale(voltdm, target_volt); |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | /** |
| 253 | * omap_voltage_reset() - Resets the voltage of a particular voltage domain |
| 254 | * to that of the current OPP. |
| 255 | * @voltdm: pointer to the VDD whose voltage is to be reset. |
| 256 | * |
| 257 | * This API finds out the correct voltage the voltage domain is supposed |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 258 | * to be at and resets the voltage to that level. Should be used especially |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 259 | * while disabling any voltage compensation modules. |
| 260 | */ |
| 261 | void omap_voltage_reset(struct voltagedomain *voltdm) |
| 262 | { |
| 263 | unsigned long target_uvdc; |
| 264 | |
| 265 | if (!voltdm || IS_ERR(voltdm)) { |
| 266 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 267 | return; |
| 268 | } |
| 269 | |
| 270 | target_uvdc = omap_voltage_get_nom_volt(voltdm); |
| 271 | if (!target_uvdc) { |
| 272 | pr_err("%s: unable to find current voltage for vdd_%s\n", |
| 273 | __func__, voltdm->name); |
| 274 | return; |
| 275 | } |
| 276 | |
| 277 | omap_voltage_scale_vdd(voltdm, target_uvdc); |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * omap_voltage_get_volttable() - API to get the voltage table associated with a |
| 282 | * particular voltage domain. |
| 283 | * @voltdm: pointer to the VDD for which the voltage table is required |
| 284 | * @volt_data: the voltage table for the particular vdd which is to be |
| 285 | * populated by this API |
| 286 | * |
| 287 | * This API populates the voltage table associated with a VDD into the |
| 288 | * passed parameter pointer. Returns the count of distinct voltages |
| 289 | * supported by this vdd. |
| 290 | * |
| 291 | */ |
| 292 | void omap_voltage_get_volttable(struct voltagedomain *voltdm, |
| 293 | struct omap_volt_data **volt_data) |
| 294 | { |
| 295 | struct omap_vdd_info *vdd; |
| 296 | |
| 297 | if (!voltdm || IS_ERR(voltdm)) { |
| 298 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 299 | return; |
| 300 | } |
| 301 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 302 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 303 | |
| 304 | *volt_data = vdd->volt_data; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * omap_voltage_get_voltdata() - API to get the voltage table entry for a |
| 309 | * particular voltage |
| 310 | * @voltdm: pointer to the VDD whose voltage table has to be searched |
| 311 | * @volt: the voltage to be searched in the voltage table |
| 312 | * |
| 313 | * This API searches through the voltage table for the required voltage |
| 314 | * domain and tries to find a matching entry for the passed voltage volt. |
| 315 | * If a matching entry is found volt_data is populated with that entry. |
| 316 | * This API searches only through the non-compensated voltages int the |
| 317 | * voltage table. |
| 318 | * Returns pointer to the voltage table entry corresponding to volt on |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 319 | * success. Returns -ENODATA if no voltage table exisits for the passed voltage |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 320 | * domain or if there is no matching entry. |
| 321 | */ |
| 322 | struct omap_volt_data *omap_voltage_get_voltdata(struct voltagedomain *voltdm, |
| 323 | unsigned long volt) |
| 324 | { |
| 325 | struct omap_vdd_info *vdd; |
| 326 | int i; |
| 327 | |
| 328 | if (!voltdm || IS_ERR(voltdm)) { |
| 329 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 330 | return ERR_PTR(-EINVAL); |
| 331 | } |
| 332 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 333 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 334 | |
| 335 | if (!vdd->volt_data) { |
| 336 | pr_warning("%s: voltage table does not exist for vdd_%s\n", |
| 337 | __func__, voltdm->name); |
| 338 | return ERR_PTR(-ENODATA); |
| 339 | } |
| 340 | |
| 341 | for (i = 0; vdd->volt_data[i].volt_nominal != 0; i++) { |
| 342 | if (vdd->volt_data[i].volt_nominal == volt) |
| 343 | return &vdd->volt_data[i]; |
| 344 | } |
| 345 | |
| 346 | pr_notice("%s: Unable to match the current voltage with the voltage" |
| 347 | "table for vdd_%s\n", __func__, voltdm->name); |
| 348 | |
| 349 | return ERR_PTR(-ENODATA); |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * omap_voltage_register_pmic() - API to register PMIC specific data |
| 354 | * @voltdm: pointer to the VDD for which the PMIC specific data is |
| 355 | * to be registered |
| 356 | * @pmic_info: the structure containing pmic info |
| 357 | * |
| 358 | * This API is to be called by the SOC/PMIC file to specify the |
| 359 | * pmic specific info as present in omap_volt_pmic_info structure. |
| 360 | */ |
| 361 | int omap_voltage_register_pmic(struct voltagedomain *voltdm, |
| 362 | struct omap_volt_pmic_info *pmic_info) |
| 363 | { |
| 364 | struct omap_vdd_info *vdd; |
| 365 | |
| 366 | if (!voltdm || IS_ERR(voltdm)) { |
| 367 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 368 | return -EINVAL; |
| 369 | } |
| 370 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 371 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 372 | |
| 373 | vdd->pmic_info = pmic_info; |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * omap_voltage_get_dbgdir() - API to get pointer to the debugfs directory |
| 380 | * corresponding to a voltage domain. |
| 381 | * |
| 382 | * @voltdm: pointer to the VDD whose debug directory is required. |
| 383 | * |
| 384 | * This API returns pointer to the debugfs directory corresponding |
| 385 | * to the voltage domain. Should be used by drivers requiring to |
| 386 | * add any debug entry for a particular voltage domain. Returns NULL |
| 387 | * in case of error. |
| 388 | */ |
| 389 | struct dentry *omap_voltage_get_dbgdir(struct voltagedomain *voltdm) |
| 390 | { |
| 391 | struct omap_vdd_info *vdd; |
| 392 | |
| 393 | if (!voltdm || IS_ERR(voltdm)) { |
| 394 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 395 | return NULL; |
| 396 | } |
| 397 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 398 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 399 | |
| 400 | return vdd->debug_dir; |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * omap_change_voltscale_method() - API to change the voltage scaling method. |
| 405 | * @voltdm: pointer to the VDD whose voltage scaling method |
| 406 | * has to be changed. |
| 407 | * @voltscale_method: the method to be used for voltage scaling. |
| 408 | * |
| 409 | * This API can be used by the board files to change the method of voltage |
| 410 | * scaling between vpforceupdate and vcbypass. The parameter values are |
| 411 | * defined in voltage.h |
| 412 | */ |
| 413 | void omap_change_voltscale_method(struct voltagedomain *voltdm, |
| 414 | int voltscale_method) |
| 415 | { |
| 416 | struct omap_vdd_info *vdd; |
| 417 | |
| 418 | if (!voltdm || IS_ERR(voltdm)) { |
| 419 | pr_warning("%s: VDD specified does not exist!\n", __func__); |
| 420 | return; |
| 421 | } |
| 422 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 423 | vdd = voltdm->vdd; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 424 | |
| 425 | switch (voltscale_method) { |
| 426 | case VOLTSCALE_VPFORCEUPDATE: |
Kevin Hilman | 01f48d3 | 2011-03-21 14:29:13 -0700 | [diff] [blame^] | 427 | vdd->volt_scale = omap_vp_forceupdate_scale; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 428 | return; |
| 429 | case VOLTSCALE_VCBYPASS: |
Kevin Hilman | d84adcf | 2011-03-22 16:14:57 -0700 | [diff] [blame] | 430 | vdd->volt_scale = omap_vc_bypass_scale; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 431 | return; |
| 432 | default: |
| 433 | pr_warning("%s: Trying to change the method of voltage scaling" |
| 434 | "to an unsupported one!\n", __func__); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | /** |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 439 | * omap_voltage_late_init() - Init the various voltage parameters |
| 440 | * |
| 441 | * This API is to be called in the later stages of the |
| 442 | * system boot to init the voltage controller and |
| 443 | * voltage processors. |
| 444 | */ |
| 445 | int __init omap_voltage_late_init(void) |
| 446 | { |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 447 | struct voltagedomain *voltdm; |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 448 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 449 | if (list_empty(&voltdm_list)) { |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 450 | pr_err("%s: Voltage driver support not added\n", |
| 451 | __func__); |
| 452 | return -EINVAL; |
| 453 | } |
| 454 | |
| 455 | voltage_dir = debugfs_create_dir("voltage", NULL); |
| 456 | if (IS_ERR(voltage_dir)) |
| 457 | pr_err("%s: Unable to create voltage debugfs main dir\n", |
| 458 | __func__); |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 459 | list_for_each_entry(voltdm, &voltdm_list, node) { |
Kevin Hilman | 37efca7 | 2011-03-23 17:00:21 -0700 | [diff] [blame] | 460 | if (!voltdm->scalable) |
| 461 | continue; |
| 462 | |
Kevin Hilman | 4d47506 | 2011-07-18 15:48:22 -0700 | [diff] [blame] | 463 | if (voltdm->vc) { |
| 464 | voltdm->vdd->volt_scale = omap_vc_bypass_scale; |
Kevin Hilman | d84adcf | 2011-03-22 16:14:57 -0700 | [diff] [blame] | 465 | omap_vc_init_channel(voltdm); |
Kevin Hilman | 4d47506 | 2011-07-18 15:48:22 -0700 | [diff] [blame] | 466 | } |
Kevin Hilman | d84adcf | 2011-03-22 16:14:57 -0700 | [diff] [blame] | 467 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 468 | if (voltdm->vdd) { |
| 469 | if (omap_vdd_data_configure(voltdm)) |
| 470 | continue; |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 471 | vdd_debugfs_init(voltdm); |
Kevin Hilman | 01f48d3 | 2011-03-21 14:29:13 -0700 | [diff] [blame^] | 472 | omap_vp_init(voltdm); |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 473 | } |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | return 0; |
| 477 | } |
| 478 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 479 | static struct voltagedomain *_voltdm_lookup(const char *name) |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 480 | { |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 481 | struct voltagedomain *voltdm, *temp_voltdm; |
| 482 | |
| 483 | voltdm = NULL; |
| 484 | |
| 485 | list_for_each_entry(temp_voltdm, &voltdm_list, node) { |
| 486 | if (!strcmp(name, temp_voltdm->name)) { |
| 487 | voltdm = temp_voltdm; |
| 488 | break; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | return voltdm; |
| 493 | } |
| 494 | |
Kevin Hilman | e69c22b | 2011-03-16 16:13:15 -0700 | [diff] [blame] | 495 | /** |
| 496 | * voltdm_add_pwrdm - add a powerdomain to a voltagedomain |
| 497 | * @voltdm: struct voltagedomain * to add the powerdomain to |
| 498 | * @pwrdm: struct powerdomain * to associate with a voltagedomain |
| 499 | * |
| 500 | * Associate the powerdomain @pwrdm with a voltagedomain @voltdm. This |
| 501 | * enables the use of voltdm_for_each_pwrdm(). Returns -EINVAL if |
| 502 | * presented with invalid pointers; -ENOMEM if memory could not be allocated; |
| 503 | * or 0 upon success. |
| 504 | */ |
| 505 | int voltdm_add_pwrdm(struct voltagedomain *voltdm, struct powerdomain *pwrdm) |
| 506 | { |
| 507 | if (!voltdm || !pwrdm) |
| 508 | return -EINVAL; |
| 509 | |
| 510 | pr_debug("voltagedomain: associating powerdomain %s with voltagedomain " |
| 511 | "%s\n", pwrdm->name, voltdm->name); |
| 512 | |
| 513 | list_add(&pwrdm->voltdm_node, &voltdm->pwrdm_list); |
| 514 | |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * voltdm_for_each_pwrdm - call function for each pwrdm in a voltdm |
| 520 | * @voltdm: struct voltagedomain * to iterate over |
| 521 | * @fn: callback function * |
| 522 | * |
| 523 | * Call the supplied function @fn for each powerdomain in the |
| 524 | * voltagedomain @voltdm. Returns -EINVAL if presented with invalid |
| 525 | * pointers; or passes along the last return value of the callback |
| 526 | * function, which should be 0 for success or anything else to |
| 527 | * indicate failure. |
| 528 | */ |
| 529 | int voltdm_for_each_pwrdm(struct voltagedomain *voltdm, |
| 530 | int (*fn)(struct voltagedomain *voltdm, |
| 531 | struct powerdomain *pwrdm)) |
| 532 | { |
| 533 | struct powerdomain *pwrdm; |
| 534 | int ret = 0; |
| 535 | |
| 536 | if (!fn) |
| 537 | return -EINVAL; |
| 538 | |
| 539 | list_for_each_entry(pwrdm, &voltdm->pwrdm_list, voltdm_node) |
| 540 | ret = (*fn)(voltdm, pwrdm); |
| 541 | |
| 542 | return ret; |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * voltdm_for_each - call function on each registered voltagedomain |
| 547 | * @fn: callback function * |
| 548 | * |
| 549 | * Call the supplied function @fn for each registered voltagedomain. |
| 550 | * The callback function @fn can return anything but 0 to bail out |
| 551 | * early from the iterator. Returns the last return value of the |
| 552 | * callback function, which should be 0 for success or anything else |
| 553 | * to indicate failure; or -EINVAL if the function pointer is null. |
| 554 | */ |
| 555 | int voltdm_for_each(int (*fn)(struct voltagedomain *voltdm, void *user), |
| 556 | void *user) |
| 557 | { |
| 558 | struct voltagedomain *temp_voltdm; |
| 559 | int ret = 0; |
| 560 | |
| 561 | if (!fn) |
| 562 | return -EINVAL; |
| 563 | |
| 564 | list_for_each_entry(temp_voltdm, &voltdm_list, node) { |
| 565 | ret = (*fn)(temp_voltdm, user); |
| 566 | if (ret) |
| 567 | break; |
| 568 | } |
| 569 | |
| 570 | return ret; |
| 571 | } |
| 572 | |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 573 | static int _voltdm_register(struct voltagedomain *voltdm) |
| 574 | { |
| 575 | if (!voltdm || !voltdm->name) |
| 576 | return -EINVAL; |
| 577 | |
Kevin Hilman | e69c22b | 2011-03-16 16:13:15 -0700 | [diff] [blame] | 578 | INIT_LIST_HEAD(&voltdm->pwrdm_list); |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 579 | list_add(&voltdm->node, &voltdm_list); |
| 580 | |
| 581 | pr_debug("voltagedomain: registered %s\n", voltdm->name); |
| 582 | |
Thara Gopinath | 2f34ce8 | 2010-05-29 22:02:21 +0530 | [diff] [blame] | 583 | return 0; |
| 584 | } |
Kevin Hilman | 81a6048 | 2011-03-16 14:25:45 -0700 | [diff] [blame] | 585 | |
| 586 | /** |
| 587 | * voltdm_lookup - look up a voltagedomain by name, return a pointer |
| 588 | * @name: name of voltagedomain |
| 589 | * |
| 590 | * Find a registered voltagedomain by its name @name. Returns a pointer |
| 591 | * to the struct voltagedomain if found, or NULL otherwise. |
| 592 | */ |
| 593 | struct voltagedomain *voltdm_lookup(const char *name) |
| 594 | { |
| 595 | struct voltagedomain *voltdm ; |
| 596 | |
| 597 | if (!name) |
| 598 | return NULL; |
| 599 | |
| 600 | voltdm = _voltdm_lookup(name); |
| 601 | |
| 602 | return voltdm; |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * voltdm_init - set up the voltagedomain layer |
| 607 | * @voltdm_list: array of struct voltagedomain pointers to register |
| 608 | * |
| 609 | * Loop through the array of voltagedomains @voltdm_list, registering all |
| 610 | * that are available on the current CPU. If voltdm_list is supplied |
| 611 | * and not null, all of the referenced voltagedomains will be |
| 612 | * registered. No return value. |
| 613 | */ |
| 614 | void voltdm_init(struct voltagedomain **voltdms) |
| 615 | { |
| 616 | struct voltagedomain **v; |
| 617 | |
| 618 | if (voltdms) { |
| 619 | for (v = voltdms; *v; v++) |
| 620 | _voltdm_register(*v); |
| 621 | } |
| 622 | } |