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opp.c
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1 /*
2  * OMAP SoC specific OPP wrapper function
3  *
4  * Copyright (C) 2009-2010 Texas Instruments Incorporated - http://www.ti.com/
5  * Nishanth Menon
6  * Kevin Hilman
7  * Copyright (C) 2010 Nokia Corporation.
8  * Eduardo Valentin
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
15  * kind, whether express or implied; without even the implied warranty
16  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  */
19 #include <linux/module.h>
20 #include <linux/opp.h>
21 #include <linux/cpu.h>
22 
23 #include <plat/omap_device.h>
24 
25 #include "omap_opp_data.h"
26 
27 /* Temp variable to allow multiple calls */
28 static u8 __initdata omap_table_init;
29 
39  u32 opp_def_size)
40 {
41  int i, r;
42 
43  if (!opp_def || !opp_def_size) {
44  pr_err("%s: invalid params!\n", __func__);
45  return -EINVAL;
46  }
47 
48  /*
49  * Initialize only if not already initialized even if the previous
50  * call failed, because, no reason we'd succeed again.
51  */
52  if (omap_table_init)
53  return -EEXIST;
54  omap_table_init = 1;
55 
56  /* Lets now register with OPP library */
57  for (i = 0; i < opp_def_size; i++, opp_def++) {
58  struct omap_hwmod *oh;
59  struct device *dev;
60 
61  if (!opp_def->hwmod_name) {
62  pr_err("%s: NULL name of omap_hwmod, failing [%d].\n",
63  __func__, i);
64  return -EINVAL;
65  }
66 
67  if (!strncmp(opp_def->hwmod_name, "mpu", 3)) {
68  /*
69  * All current OMAPs share voltage rail and
70  * clock source, so CPU0 is used to represent
71  * the MPU-SS.
72  */
73  dev = get_cpu_device(0);
74  } else {
75  oh = omap_hwmod_lookup(opp_def->hwmod_name);
76  if (!oh || !oh->od) {
77  pr_debug("%s: no hwmod or odev for %s, [%d] cannot add OPPs.\n",
78  __func__, opp_def->hwmod_name, i);
79  continue;
80  }
81  dev = &oh->od->pdev->dev;
82  }
83 
84  r = opp_add(dev, opp_def->freq, opp_def->u_volt);
85  if (r) {
86  dev_err(dev, "%s: add OPP %ld failed for %s [%d] result=%d\n",
87  __func__, opp_def->freq,
88  opp_def->hwmod_name, i, r);
89  } else {
90  if (!opp_def->default_available)
91  r = opp_disable(dev, opp_def->freq);
92  if (r)
93  dev_err(dev, "%s: disable %ld failed for %s [%d] result=%d\n",
94  __func__, opp_def->freq,
95  opp_def->hwmod_name, i, r);
96  }
97  }
98 
99  return 0;
100 }