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 <plat/omap_device.h>
  27
  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, count = 0;
  40
  41         while (volt_data[count].volt_nominal)
  42                 count++;
  43
  44         nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
  45                         GFP_KERNEL);
  46
  47         for (i = 0; i < count; i++) {
  48                 u32 v;
  49                 /*
  50                  * In OMAP4 the efuse registers are 24 bit aligned.
  51                  * A __raw_readl 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                 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
  65                 nvalue_table[i].nvalue = v;
  66         }
  67
  68         sr_data->nvalue_table = nvalue_table;
  69         sr_data->nvalue_count = count;
  70 }
  71
  72 static int __init sr_dev_init(struct omap_hwmod *oh, void *user)
  73 {
  74         struct omap_sr_data *sr_data;
  75         struct platform_device *pdev;
  76         struct omap_volt_data *volt_data;
  77         struct omap_smartreflex_dev_attr *sr_dev_attr;
  78         char *name = "smartreflex";
  79         static int i;
  80
  81         sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
  82         if (!sr_data) {
  83                 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n",
  84                         __func__, oh->name);
  85                 return -ENOMEM;
  86         }
  87
  88         sr_dev_attr = (struct omap_smartreflex_dev_attr *)oh->dev_attr;
  89         if (!sr_dev_attr || !sr_dev_attr->sensor_voltdm_name) {
  90                 pr_err("%s: No voltage domain specified for %s."
  91                                 "Cannot initialize\n", __func__,
  92                                         oh->name);
  93                 goto exit;
  94         }
  95
  96         sr_data->name = oh->name;
  97         sr_data->ip_type = oh->class->rev;
  98         sr_data->senn_mod = 0x1;
  99         sr_data->senp_mod = 0x1;
 100
 101         sr_data->voltdm = voltdm_lookup(sr_dev_attr->sensor_voltdm_name);
 102         if (IS_ERR(sr_data->voltdm)) {
 103                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 104                         __func__, sr_dev_attr->sensor_voltdm_name);
 105                 goto exit;
 106         }
 107
 108         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 109         if (!volt_data) {
 110                 pr_warning("%s: No Voltage table registerd fo VDD%d."
 111                         "Something really wrong\n\n", __func__, i + 1);
 112                 goto exit;
 113         }
 114
 115         sr_set_nvalues(volt_data, sr_data);
 116
 117         sr_data->enable_on_init = sr_enable_on_init;
 118
 119         pdev = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
 120                                  NULL, 0, 0);
 121         if (IS_ERR(pdev))
 122                 pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
 123                         __func__, name, oh->name);
 124 exit:
 125         i++;
 126         kfree(sr_data);
 127         return 0;
 128 }
 129
 130 /*
 131  * API to be called from board files to enable smartreflex
 132  * autocompensation at init.
 133  */
 134 void __init omap_enable_smartreflex_on_init(void)
 135 {
 136         sr_enable_on_init = true;
 137 }
 138
 139 int __init omap_devinit_smartreflex(void)
 140 {
 141         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 142 }