arch/arm/mach-omap2/sr_device.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP3/OMAP4 smartreflex device file
   4  *
   5  * Author: Thara Gopinath       <thara@ti.com>
   6  *
   7  * Based originally on code from smartreflex.c
   8  * Copyright (C) 2010 Texas Instruments, Inc.
   9  * Thara Gopinath <thara@ti.com>
  10  *
  11  * Copyright (C) 2008 Nokia Corporation
  12  * Kalle Jokiniemi
  13  *
  14  * Copyright (C) 2007 Texas Instruments, Inc.
  15  * Lesly A M <x0080970@ti.com>
  16  */
  17 #include <linux/power/smartreflex.h>
  18
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/io.h>
  22
  23 #include "soc.h"
  24 #include "omap_device.h"
  25 #include "voltage.h"
  26 #include "control.h"
  27 #include "pm.h"
  28
  29 /* Read EFUSE values from control registers for OMAP3430 */
  30 static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
  31                                 struct omap_sr_data *sr_data)
  32 {
  33         struct omap_sr_nvalue_table *nvalue_table;
  34         int i, j, count = 0;
  35
  36         sr_data->nvalue_count = 0;
  37         sr_data->nvalue_table = NULL;
  38
  39         while (volt_data[count].volt_nominal)
  40                 count++;
  41
  42         nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL);
  43         if (!nvalue_table)
  44                 return;
  45
  46         for (i = 0, j = 0; i < count; i++) {
  47                 u32 v;
  48
  49                 /*
  50                  * In OMAP4 the efuse registers are 24 bit aligned.
  51                  * A readl_relaxed will fail for non-32 bit aligned address
  52                  * and hence the 8-bit read and shift.
  53                  */
  54                 if (cpu_is_omap44xx()) {
  55                         u16 offset = volt_data[i].sr_efuse_offs;
  56
  57                         v = omap_ctrl_readb(offset) |
  58                                 omap_ctrl_readb(offset + 1) << 8 |
  59                                 omap_ctrl_readb(offset + 2) << 16;
  60                 } else {
  61                         v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
  62                 }
  63
  64                 /*
  65                  * Many OMAP SoCs don't have the eFuse values set.
  66                  * For example, pretty much all OMAP3xxx before
  67                  * ES3.something.
  68                  *
  69                  * XXX There needs to be some way for board files or
  70                  * userspace to add these in.
  71                  */
  72                 if (v == 0)
  73                         continue;
  74
  75                 nvalue_table[j].nvalue = v;
  76                 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
  77                 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
  78                 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
  79
  80                 j++;
  81         }
  82
  83         sr_data->nvalue_table = nvalue_table;
  84         sr_data->nvalue_count = j;
  85 }
  86
  87 extern struct omap_sr_data omap_sr_pdata[];
  88
  89 static int __init sr_init_by_name(const char *name, const char *voltdm)
  90 {
  91         struct omap_sr_data *sr_data = NULL;
  92         struct omap_volt_data *volt_data;
  93         static int i;
  94
  95         if (!strncmp(name, "smartreflex_mpu_iva", 20) ||
  96             !strncmp(name, "smartreflex_mpu", 16))
  97                 sr_data = &omap_sr_pdata[OMAP_SR_MPU];
  98         else if (!strncmp(name, "smartreflex_core", 17))
  99                 sr_data = &omap_sr_pdata[OMAP_SR_CORE];
 100         else if (!strncmp(name, "smartreflex_iva", 16))
 101                 sr_data = &omap_sr_pdata[OMAP_SR_IVA];
 102
 103         if (!sr_data) {
 104                 pr_err("%s: Unknown instance %s\n", __func__, name);
 105                 return -EINVAL;
 106         }
 107
 108         sr_data->name = name;
 109         if (cpu_is_omap343x())
 110                 sr_data->ip_type = 1;
 111         else
 112                 sr_data->ip_type = 2;
 113         sr_data->senn_mod = 0x1;
 114         sr_data->senp_mod = 0x1;
 115
 116         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 117                 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
 118                 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
 119                 sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
 120                 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
 121                         sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
 122                         sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
 123                 } else {
 124                         sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
 125                         sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
 126                 }
 127         }
 128
 129         sr_data->voltdm = voltdm_lookup(voltdm);
 130         if (!sr_data->voltdm) {
 131                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 132                         __func__, voltdm);
 133                 goto exit;
 134         }
 135
 136         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 137         if (!volt_data) {
 138                 pr_err("%s: No Voltage table registered for VDD%d\n",
 139                        __func__, i + 1);
 140                 goto exit;
 141         }
 142
 143         sr_set_nvalues(volt_data, sr_data);
 144
 145 exit:
 146         i++;
 147
 148         return 0;
 149 }
 150
 151 #ifdef CONFIG_OMAP_HWMOD
 152 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
 153 {
 154         struct omap_smartreflex_dev_attr *sr_dev_attr;
 155
 156         sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
 157         if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
 158                 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
 159                        __func__, oh->name);
 160                 return 0;
 161         }
 162
 163         return sr_init_by_name(oh->name, sr_dev_attr->sensor_voltdm_name);
 164 }
 165 #else
 166 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
 167 {
 168         return -EINVAL;
 169 }
 170 #endif
 171
 172 static const char * const omap4_sr_instances[] = {
 173         "mpu",
 174         "iva",
 175         "core",
 176 };
 177
 178 static const char * const dra7_sr_instances[] = {
 179         "mpu",
 180         "core",
 181 };
 182
 183 int __init omap_devinit_smartreflex(void)
 184 {
 185         const char * const *sr_inst = NULL;
 186         int i, nr_sr = 0;
 187
 188         if (soc_is_omap44xx()) {
 189                 sr_inst = omap4_sr_instances;
 190                 nr_sr = ARRAY_SIZE(omap4_sr_instances);
 191
 192         } else if (soc_is_dra7xx()) {
 193                 sr_inst = dra7_sr_instances;
 194                 nr_sr = ARRAY_SIZE(dra7_sr_instances);
 195         }
 196
 197         if (nr_sr) {
 198                 const char *name, *voltdm;
 199
 200                 for (i = 0; i < nr_sr; i++) {
 201                         name = kasprintf(GFP_KERNEL, "smartreflex_%s", sr_inst[i]);
 202                         voltdm = sr_inst[i];
 203                         sr_init_by_name(name, voltdm);
 204                 }
 205
 206                 return 0;
 207         }
 208
 209         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 210 }