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 static bool sr_enable_on_init;
  30
  31 /* Read EFUSE values from control registers for OMAP3430 */
  32 static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
  33                                 struct omap_sr_data *sr_data)
  34 {
  35         struct omap_sr_nvalue_table *nvalue_table;
  36         int i, j, count = 0;
  37
  38         sr_data->nvalue_count = 0;
  39         sr_data->nvalue_table = NULL;
  40
  41         while (volt_data[count].volt_nominal)
  42                 count++;
  43
  44         nvalue_table = kcalloc(count, sizeof(*nvalue_table), GFP_KERNEL);
  45         if (!nvalue_table)
  46                 return;
  47
  48         for (i = 0, j = 0; i < count; i++) {
  49                 u32 v;
  50
  51                 /*
  52                  * In OMAP4 the efuse registers are 24 bit aligned.
  53                  * A readl_relaxed will fail for non-32 bit aligned address
  54                  * and hence the 8-bit read and shift.
  55                  */
  56                 if (cpu_is_omap44xx()) {
  57                         u16 offset = volt_data[i].sr_efuse_offs;
  58
  59                         v = omap_ctrl_readb(offset) |
  60                                 omap_ctrl_readb(offset + 1) << 8 |
  61                                 omap_ctrl_readb(offset + 2) << 16;
  62                 } else {
  63                         v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
  64                 }
  65
  66                 /*
  67                  * Many OMAP SoCs don't have the eFuse values set.
  68                  * For example, pretty much all OMAP3xxx before
  69                  * ES3.something.
  70                  *
  71                  * XXX There needs to be some way for board files or
  72                  * userspace to add these in.
  73                  */
  74                 if (v == 0)
  75                         continue;
  76
  77                 nvalue_table[j].nvalue = v;
  78                 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
  79                 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
  80                 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
  81
  82                 j++;
  83         }
  84
  85         sr_data->nvalue_table = nvalue_table;
  86         sr_data->nvalue_count = j;
  87 }
  88
  89 extern struct omap_sr_data omap_sr_pdata[];
  90
  91 static int __init sr_init_by_name(const char *name, const char *voltdm)
  92 {
  93         struct omap_sr_data *sr_data = NULL;
  94         struct omap_volt_data *volt_data;
  95         static int i;
  96
  97         if (!strncmp(name, "smartreflex_mpu_iva", 20) ||
  98             !strncmp(name, "smartreflex_mpu", 16))
  99                 sr_data = &omap_sr_pdata[OMAP_SR_MPU];
 100         else if (!strncmp(name, "smartreflex_core", 17))
 101                 sr_data = &omap_sr_pdata[OMAP_SR_CORE];
 102         else if (!strncmp(name, "smartreflex_iva", 16))
 103                 sr_data = &omap_sr_pdata[OMAP_SR_IVA];
 104
 105         if (!sr_data) {
 106                 pr_err("%s: Unknown instance %s\n", __func__, name);
 107                 return -EINVAL;
 108         }
 109
 110         sr_data->name = name;
 111         if (cpu_is_omap343x())
 112                 sr_data->ip_type = 1;
 113         else
 114                 sr_data->ip_type = 2;
 115         sr_data->senn_mod = 0x1;
 116         sr_data->senp_mod = 0x1;
 117
 118         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 119                 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
 120                 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
 121                 sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
 122                 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
 123                         sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
 124                         sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
 125                 } else {
 126                         sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
 127                         sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
 128                 }
 129         }
 130
 131         sr_data->voltdm = voltdm_lookup(voltdm);
 132         if (!sr_data->voltdm) {
 133                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 134                         __func__, voltdm);
 135                 goto exit;
 136         }
 137
 138         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 139         if (!volt_data) {
 140                 pr_err("%s: No Voltage table registered for VDD%d\n",
 141                        __func__, i + 1);
 142                 goto exit;
 143         }
 144
 145         sr_set_nvalues(volt_data, sr_data);
 146
 147         sr_data->enable_on_init = sr_enable_on_init;
 148
 149 exit:
 150         i++;
 151
 152         return 0;
 153 }
 154
 155 #ifdef CONFIG_OMAP_HWMOD
 156 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
 157 {
 158         struct omap_smartreflex_dev_attr *sr_dev_attr;
 159
 160         sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
 161         if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
 162                 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
 163                        __func__, oh->name);
 164                 return 0;
 165         }
 166
 167         return sr_init_by_name(oh->name, sr_dev_attr->sensor_voltdm_name);
 168 }
 169 #else
 170 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
 171 {
 172         return -EINVAL;
 173 }
 174 #endif
 175
 176 /*
 177  * API to be called from board files to enable smartreflex
 178  * autocompensation at init.
 179  */
 180 void __init omap_enable_smartreflex_on_init(void)
 181 {
 182         sr_enable_on_init = true;
 183 }
 184
 185 static const char * const omap4_sr_instances[] = {
 186         "mpu",
 187         "iva",
 188         "core",
 189 };
 190
 191 static const char * const dra7_sr_instances[] = {
 192         "mpu",
 193         "core",
 194 };
 195
 196 int __init omap_devinit_smartreflex(void)
 197 {
 198         const char * const *sr_inst = NULL;
 199         int i, nr_sr = 0;
 200
 201         if (soc_is_omap44xx()) {
 202                 sr_inst = omap4_sr_instances;
 203                 nr_sr = ARRAY_SIZE(omap4_sr_instances);
 204
 205         } else if (soc_is_dra7xx()) {
 206                 sr_inst = dra7_sr_instances;
 207                 nr_sr = ARRAY_SIZE(dra7_sr_instances);
 208         }
 209
 210         if (nr_sr) {
 211                 const char *name, *voltdm;
 212
 213                 for (i = 0; i < nr_sr; i++) {
 214                         name = kasprintf(GFP_KERNEL, "smartreflex_%s", sr_inst[i]);
 215                         voltdm = sr_inst[i];
 216                         sr_init_by_name(name, voltdm);
 217                 }
 218
 219                 return 0;
 220         }
 221
 222         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 223 }