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_dev_init(struct omap_hwmod *oh, void *user)
  92 {
  93         struct omap_sr_data *sr_data = NULL;
  94         struct omap_volt_data *volt_data;
  95         struct omap_smartreflex_dev_attr *sr_dev_attr;
  96         static int i;
  97
  98         if (!strncmp(oh->name, "smartreflex_mpu_iva", 20) ||
  99             !strncmp(oh->name, "smartreflex_mpu", 16))
 100                 sr_data = &omap_sr_pdata[OMAP_SR_MPU];
 101         else if (!strncmp(oh->name, "smartreflex_core", 17))
 102                 sr_data = &omap_sr_pdata[OMAP_SR_CORE];
 103         else if (!strncmp(oh->name, "smartreflex_iva", 16))
 104                 sr_data = &omap_sr_pdata[OMAP_SR_IVA];
 105
 106         if (!sr_data) {
 107                 pr_err("%s: Unknown instance %s\n", __func__, oh->name);
 108                 return -EINVAL;
 109         }
 110
 111         sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
 112         if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
 113                 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
 114                        __func__, oh->name);
 115                 goto exit;
 116         }
 117
 118         sr_data->name = oh->name;
 119         if (cpu_is_omap343x())
 120                 sr_data->ip_type = 1;
 121         else
 122                 sr_data->ip_type = 2;
 123         sr_data->senn_mod = 0x1;
 124         sr_data->senp_mod = 0x1;
 125
 126         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 127                 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
 128                 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
 129                 sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
 130                 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
 131                         sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
 132                         sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
 133                 } else {
 134                         sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
 135                         sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
 136                 }
 137         }
 138
 139         sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
 140         if (!sr_data->voltdm) {
 141                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 142                         __func__, sr_dev_attr->sensor_voltdm_name);
 143                 goto exit;
 144         }
 145
 146         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 147         if (!volt_data) {
 148                 pr_err("%s: No Voltage table registered for VDD%d\n",
 149                        __func__, i + 1);
 150                 goto exit;
 151         }
 152
 153         sr_set_nvalues(volt_data, sr_data);
 154
 155         sr_data->enable_on_init = sr_enable_on_init;
 156
 157 exit:
 158         i++;
 159
 160         return 0;
 161 }
 162
 163 /*
 164  * API to be called from board files to enable smartreflex
 165  * autocompensation at init.
 166  */
 167 void __init omap_enable_smartreflex_on_init(void)
 168 {
 169         sr_enable_on_init = true;
 170 }
 171
 172 int __init omap_devinit_smartreflex(void)
 173 {
 174         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 175 }