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clock-pcom.c
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1 /*
2  * Copyright (C) 2007 Google, Inc.
3  * Copyright (c) 2007-2010, Code Aurora Forum. All rights reserved.
4  *
5  * This software is licensed under the terms of the GNU General Public
6  * License version 2, as published by the Free Software Foundation, and
7  * may be copied, distributed, and modified under those terms.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  */
15 
16 #include <linux/err.h>
17 #include <linux/ctype.h>
18 #include <linux/stddef.h>
19 #include <mach/clk.h>
20 
21 #include "proc_comm.h"
22 #include "clock.h"
23 #include "clock-pcom.h"
24 
25 /*
26  * glue for the proc_comm interface
27  */
28 static int pc_clk_enable(unsigned id)
29 {
31  if (rc < 0)
32  return rc;
33  else
34  return (int)id < 0 ? -EINVAL : 0;
35 }
36 
37 static void pc_clk_disable(unsigned id)
38 {
40 }
41 
42 int pc_clk_reset(unsigned id, enum clk_reset_action action)
43 {
44  int rc;
45 
46  if (action == CLK_RESET_ASSERT)
48  else
50 
51  if (rc < 0)
52  return rc;
53  else
54  return (int)id < 0 ? -EINVAL : 0;
55 }
56 
57 static int pc_clk_set_rate(unsigned id, unsigned rate)
58 {
59  /* The rate _might_ be rounded off to the nearest KHz value by the
60  * remote function. So a return value of 0 doesn't necessarily mean
61  * that the exact rate was set successfully.
62  */
63  int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &rate);
64  if (rc < 0)
65  return rc;
66  else
67  return (int)id < 0 ? -EINVAL : 0;
68 }
69 
70 static int pc_clk_set_min_rate(unsigned id, unsigned rate)
71 {
72  int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &rate);
73  if (rc < 0)
74  return rc;
75  else
76  return (int)id < 0 ? -EINVAL : 0;
77 }
78 
79 static int pc_clk_set_max_rate(unsigned id, unsigned rate)
80 {
81  int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MAX_RATE, &id, &rate);
82  if (rc < 0)
83  return rc;
84  else
85  return (int)id < 0 ? -EINVAL : 0;
86 }
87 
88 static int pc_clk_set_flags(unsigned id, unsigned flags)
89 {
90  int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_FLAGS, &id, &flags);
91  if (rc < 0)
92  return rc;
93  else
94  return (int)id < 0 ? -EINVAL : 0;
95 }
96 
97 static unsigned pc_clk_get_rate(unsigned id)
98 {
100  return 0;
101  else
102  return id;
103 }
104 
105 static unsigned pc_clk_is_enabled(unsigned id)
106 {
108  return 0;
109  else
110  return id;
111 }
112 
113 static long pc_clk_round_rate(unsigned id, unsigned rate)
114 {
115 
116  /* Not really supported; pc_clk_set_rate() does rounding on it's own. */
117  return rate;
118 }
119 
120 static bool pc_clk_is_local(unsigned id)
121 {
122  return false;
123 }
124 
126  .enable = pc_clk_enable,
127  .disable = pc_clk_disable,
128  .auto_off = pc_clk_disable,
129  .reset = pc_clk_reset,
130  .set_rate = pc_clk_set_rate,
131  .set_min_rate = pc_clk_set_min_rate,
132  .set_max_rate = pc_clk_set_max_rate,
133  .set_flags = pc_clk_set_flags,
134  .get_rate = pc_clk_get_rate,
135  .is_enabled = pc_clk_is_enabled,
136  .round_rate = pc_clk_round_rate,
137  .is_local = pc_clk_is_local,
138 };