arch/arm/mach-omap2/sr_device.c

   1 /*
   2  * OMAP3/OMAP4 smartreflex device file
   3  *
   4  * Author: Thara Gopinath       <thara@ti.com>
   5  *
   6  * Based originally on code from smartreflex.c
   7  * Copyright (C) 2010 Texas Instruments, Inc.
   8  * Thara Gopinath <thara@ti.com>
   9  *
  10  * Copyright (C) 2008 Nokia Corporation
  11  * Kalle Jokiniemi
  12  *
  13  * Copyright (C) 2007 Texas Instruments, Inc.
  14  * Lesly A M <x0080970@ti.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20 #include <linux/power/smartreflex.h>
  21
  22 #include <linux/err.h>
  23 #include <linux/slab.h>
  24 #include <linux/io.h>
  25
  26 #include "soc.h"
  27 #include "omap_device.h"
  28 #include "voltage.h"
  29 #include "control.h"
  30 #include "pm.h"
  31
  32 static bool sr_enable_on_init;
  33
  34 /* Read EFUSE values from control registers for OMAP3430 */
  35 static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
  36                                 struct omap_sr_data *sr_data)
  37 {
  38         struct omap_sr_nvalue_table *nvalue_table;
  39         int i, j, count = 0;
  40
  41         sr_data->nvalue_count = 0;
  42         sr_data->nvalue_table = NULL;
  43
  44         while (volt_data[count].volt_nominal)
  45                 count++;
  46
  47         nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
  48                         GFP_KERNEL);
  49
  50         if (!nvalue_table) {
  51                 pr_err("OMAP: SmartReflex: cannot allocate memory for n-value table\n");
  52                 return;
  53         }
  54
  55         for (i = 0, j = 0; i < count; i++) {
  56                 u32 v;
  57
  58                 /*
  59                  * In OMAP4 the efuse registers are 24 bit aligned.
  60                  * A readl_relaxed will fail for non-32 bit aligned address
  61                  * and hence the 8-bit read and shift.
  62                  */
  63                 if (cpu_is_omap44xx()) {
  64                         u16 offset = volt_data[i].sr_efuse_offs;
  65
  66                         v = omap_ctrl_readb(offset) |
  67                                 omap_ctrl_readb(offset + 1) << 8 |
  68                                 omap_ctrl_readb(offset + 2) << 16;
  69                 } else {
  70                         v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
  71                 }
  72
  73                 /*
  74                  * Many OMAP SoCs don't have the eFuse values set.
  75                  * For example, pretty much all OMAP3xxx before
  76                  * ES3.something.
  77                  *
  78                  * XXX There needs to be some way for board files or
  79                  * userspace to add these in.
  80                  */
  81                 if (v == 0)
  82                         continue;
  83
  84                 nvalue_table[j].nvalue = v;
  85                 nvalue_table[j].efuse_offs = volt_data[i].sr_efuse_offs;
  86                 nvalue_table[j].errminlimit = volt_data[i].sr_errminlimit;
  87                 nvalue_table[j].volt_nominal = volt_data[i].volt_nominal;
  88
  89                 j++;
  90         }
  91
  92         sr_data->nvalue_table = nvalue_table;
  93         sr_data->nvalue_count = j;
  94 }
  95
  96 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
  97 {
  98         struct omap_sr_data *sr_data;
  99         struct platform_device *pdev;
 100         struct omap_volt_data *volt_data;
 101         struct omap_smartreflex_dev_attr *sr_dev_attr;
 102         char *name = "smartreflex";
 103         static int i;
 104
 105         sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
 106         if (!sr_data) {
 107                 pr_err("%s: Unable to allocate memory for %s sr_data\n",
 108                        __func__, oh->name);
 109                 return -ENOMEM;
 110         }
 111
 112         sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
 113         if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
 114                 pr_err("%s: No voltage domain specified for %s. Cannot initialize\n",
 115                        __func__, oh->name);
 116                 goto exit;
 117         }
 118
 119         sr_data->name = oh->name;
 120         sr_data->ip_type = oh->class->rev;
 121         sr_data->senn_mod = 0x1;
 122         sr_data->senp_mod = 0x1;
 123
 124         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 125                 sr_data->err_weight = OMAP3430_SR_ERRWEIGHT;
 126                 sr_data->err_maxlimit = OMAP3430_SR_ERRMAXLIMIT;
 127                 sr_data->accum_data = OMAP3430_SR_ACCUMDATA;
 128                 if (!(strcmp(sr_data->name, "smartreflex_mpu"))) {
 129                         sr_data->senn_avgweight = OMAP3430_SR1_SENNAVGWEIGHT;
 130                         sr_data->senp_avgweight = OMAP3430_SR1_SENPAVGWEIGHT;
 131                 } else {
 132                         sr_data->senn_avgweight = OMAP3430_SR2_SENNAVGWEIGHT;
 133                         sr_data->senp_avgweight = OMAP3430_SR2_SENPAVGWEIGHT;
 134                 }
 135         }
 136
 137         sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
 138         if (!sr_data->voltdm) {
 139                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 140                         __func__, sr_dev_attr->sensor_voltdm_name);
 141                 goto exit;
 142         }
 143
 144         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 145         if (!volt_data) {
 146                 pr_err("%s: No Voltage table registered for VDD%d\n",
 147                        __func__, i + 1);
 148                 goto exit;
 149         }
 150
 151         sr_set_nvalues(volt_data, sr_data);
 152
 153         sr_data->enable_on_init = sr_enable_on_init;
 154
 155         pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data));
 156         if (IS_ERR(pdev))
 157                 pr_warn("%s: Could not build omap_device for %s: %s\n",
 158                         __func__, name, oh->name);
 159 exit:
 160         i++;
 161         kfree(sr_data);
 162         return 0;
 163 }
 164
 165 /*
 166  * API to be called from board files to enable smartreflex
 167  * autocompensation at init.
 168  */
 169 void __init omap_enable_smartreflex_on_init(void)
 170 {
 171         sr_enable_on_init = true;
 172 }
 173
 174 int __init omap_devinit_smartreflex(void)
 175 {
 176         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 177 }