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