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
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 #include <linux/io.h>
  24
  25 #include <plat/omap_device.h>
  26 #include <plat/smartreflex.h>
  27 #include <plat/voltage.h>
  28
  29 #include "control.h"
  30 #include "pm.h"
  31
  32 static bool sr_enable_on_init;
  33
  34 static struct omap_device_pm_latency omap_sr_latency[] = {
  35         {
  36                 .deactivate_func = omap_device_idle_hwmods,
  37                 .activate_func   = omap_device_enable_hwmods,
  38                 .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST
  39         },
  40 };
  41
  42 /* Read EFUSE values from control registers for OMAP3430 */
  43 static void __init sr_set_nvalues(struct omap_volt_data *volt_data,
  44                                 struct omap_sr_data *sr_data)
  45 {
  46         struct omap_sr_nvalue_table *nvalue_table;
  47         int i, count = 0;
  48
  49         while (volt_data[count].volt_nominal)
  50                 count++;
  51
  52         nvalue_table = kzalloc(sizeof(struct omap_sr_nvalue_table)*count,
  53                         GFP_KERNEL);
  54
  55         for (i = 0; i < count; i++) {
  56                 u32 v;
  57                 /*
  58                  * In OMAP4 the efuse registers are 24 bit aligned.
  59                  * A __raw_readl will fail for non-32 bit aligned address
  60                  * and hence the 8-bit read and shift.
  61                  */
  62                 if (cpu_is_omap44xx()) {
  63                         u16 offset = volt_data[i].sr_efuse_offs;
  64
  65                         v = omap_ctrl_readb(offset) |
  66                                 omap_ctrl_readb(offset + 1) << 8 |
  67                                 omap_ctrl_readb(offset + 2) << 16;
  68                 } else {
  69                          v = omap_ctrl_readl(volt_data[i].sr_efuse_offs);
  70                 }
  71
  72                 nvalue_table[i].efuse_offs = volt_data[i].sr_efuse_offs;
  73                 nvalue_table[i].nvalue = v;
  74         }
  75
  76         sr_data->nvalue_table = nvalue_table;
  77         sr_data->nvalue_count = count;
  78 }
  79
  80 static int sr_dev_init(struct omap_hwmod *oh, void *user)
  81 {
  82         struct omap_sr_data *sr_data;
  83         struct omap_device *od;
  84         struct omap_volt_data *volt_data;
  85         char *name = "smartreflex";
  86         static int i;
  87
  88         sr_data = kzalloc(sizeof(struct omap_sr_data), GFP_KERNEL);
  89         if (!sr_data) {
  90                 pr_err("%s: Unable to allocate memory for %s sr_data.Error!\n",
  91                         __func__, oh->name);
  92                 return -ENOMEM;
  93         }
  94
  95         if (!oh->vdd_name) {
  96                 pr_err("%s: No voltage domain specified for %s."
  97                         "Cannot initialize\n", __func__, oh->name);
  98                 goto exit;
  99         }
 100
 101         sr_data->ip_type = oh->class->rev;
 102         sr_data->senn_mod = 0x1;
 103         sr_data->senp_mod = 0x1;
 104
 105         sr_data->voltdm = omap_voltage_domain_lookup(oh->vdd_name);
 106         if (IS_ERR(sr_data->voltdm)) {
 107                 pr_err("%s: Unable to get voltage domain pointer for VDD %s\n",
 108                         __func__, oh->vdd_name);
 109                 goto exit;
 110         }
 111
 112         omap_voltage_get_volttable(sr_data->voltdm, &volt_data);
 113         if (!volt_data) {
 114                 pr_warning("%s: No Voltage table registerd fo VDD%d."
 115                         "Something really wrong\n\n", __func__, i + 1);
 116                 goto exit;
 117         }
 118
 119         sr_set_nvalues(volt_data, sr_data);
 120
 121         sr_data->enable_on_init = sr_enable_on_init;
 122
 123         od = omap_device_build(name, i, oh, sr_data, sizeof(*sr_data),
 124                                omap_sr_latency,
 125                                ARRAY_SIZE(omap_sr_latency), 0);
 126         if (IS_ERR(od))
 127                 pr_warning("%s: Could not build omap_device for %s: %s.\n\n",
 128                         __func__, name, oh->name);
 129 exit:
 130         i++;
 131         kfree(sr_data);
 132         return 0;
 133 }
 134
 135 /*
 136  * API to be called from board files to enable smartreflex
 137  * autocompensation at init.
 138  */
 139 void __init omap_enable_smartreflex_on_init(void)
 140 {
 141         sr_enable_on_init = true;
 142 }
 143
 144 int __init omap_devinit_smartreflex(void)
 145 {
 146         return omap_hwmod_for_each_by_class("smartreflex", sr_dev_init, NULL);
 147 }