arch/arm/mach-omap2/board-n800-dsp.c

   1 /*
   2  * linux/arch/arm/mach-omap2/board-n800-dsp.c
   3  *
   4  * Copyright (C) 2006 Nokia Corporation.
   5  *
   6  * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/device.h>
  26 #include <linux/list.h>
  27 #include <linux/err.h>
  28 #include <linux/clk.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/arch/clock.h>
  32 #include <asm/arch/board.h>
  33 #include <asm/arch/dsp_common.h>
  34
  35 #if     defined(CONFIG_OMAP_DSP)
  36
  37 /*
  38  * dsp peripheral device: AUDIO
  39  */
  40 static struct dsp_kfunc_device n800_audio_device = {
  41         .name    = "audio",
  42         .type    = DSP_KFUNC_DEV_TYPE_AUDIO,
  43         .enable  = n800_audio_enable,
  44         .disable = n800_audio_disable,
  45 };
  46
  47 /*
  48  * dsp peripheral device: TIMER
  49  */
  50 static int dsp_timer_probe(struct dsp_kfunc_device *kdev, int stage)
  51 {
  52         char clockname[20];
  53
  54         strcpy(clockname, kdev->name);
  55         strcat(clockname, "_fck");
  56
  57         kdev->fck = clk_get(NULL, clockname);
  58         if (IS_ERR(kdev->fck)) {
  59                 printk(KERN_ERR "couldn't acquire %s\n", clockname);
  60                 return PTR_ERR(kdev->fck);
  61         }
  62         pr_debug("%s probed successfully\n", clockname);
  63
  64         strcpy(clockname, kdev->name);
  65         strcat(clockname, "_ick");
  66         kdev->ick = clk_get(NULL, clockname);
  67         if (IS_ERR(kdev->ick)) {
  68                 printk(KERN_ERR "couldn't acquire %s\n", clockname);
  69                 goto fail;
  70         }
  71         pr_debug("%s probed successfully\n", clockname);
  72
  73         return 0;
  74  fail:
  75         clk_put(kdev->fck);
  76
  77         return PTR_ERR(kdev->ick);
  78 }
  79
  80 static int dsp_timer_remove(struct dsp_kfunc_device *kdev, int stage)
  81 {
  82         clk_put(kdev->ick);
  83         clk_put(kdev->fck);
  84         pr_debug("%s removed successfully\n", kdev->name);
  85         return 0;
  86 }
  87
  88 static int dsp_timer_enable(struct dsp_kfunc_device *kdev, int stage)
  89 {
  90         pr_debug("%s enabled(%d)\n", kdev->name, stage);
  91
  92         spin_lock(&kdev->lock);
  93
  94         if (kdev->enabled)
  95                 goto out;
  96         kdev->enabled = 1;
  97
  98         clk_enable(kdev->fck);
  99         clk_enable(kdev->ick);
 100  out:
 101         spin_unlock(&kdev->lock);
 102
 103         return 0;
 104 }
 105
 106 static int dsp_timer_disable(struct dsp_kfunc_device *kdev, int stage)
 107 {
 108         pr_debug("%s disabled(%d)\n", kdev->name, stage);
 109
 110         spin_lock(&kdev->lock);
 111
 112         if (kdev->enabled == 0)
 113                 goto out;
 114         kdev->enabled = 0;
 115
 116         clk_disable(kdev->ick);
 117         clk_disable(kdev->fck);
 118  out:
 119         spin_unlock(&kdev->lock);
 120
 121         return 0;
 122 }
 123
 124 static struct dsp_kfunc_device n800_timer_device = {
 125         .name    = "gpt5",
 126         .type    = DSP_KFUNC_DEV_TYPE_COMMON,
 127         .probe   = dsp_timer_probe,
 128         .remove  = dsp_timer_remove,
 129         .enable  = dsp_timer_enable,
 130         .disable = dsp_timer_disable,
 131 };
 132
 133 static struct dsp_kfunc_device *n800_kfunc_dev[] = {
 134         &n800_audio_device,
 135         &n800_timer_device,
 136 };
 137
 138 void __init n800_dsp_init(void)
 139 {
 140         int i, ret;
 141         struct dsp_kfunc_device **p = n800_kfunc_dev;
 142
 143         for (i = 0; i < ARRAY_SIZE(n800_kfunc_dev); i++) {
 144                 ret = dsp_kfunc_device_register(p[i]);
 145                 if (ret) {
 146                         printk(KERN_ERR
 147                                "KFUNC device registration failed: %s\n",
 148                                p[i]->name);
 149                 }
 150         }
 151 }
 152
 153 #else
 154 void __init n800_dsp_init(void) { }
 155 #endif  /* CONFIG_OMAP_DSP */