arch/arm/mach-msm/clock-pcom.c

   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 {
  30         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_ENABLE, &id, NULL);
  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 {
  39         msm_proc_comm(PCOM_CLKCTL_RPC_DISABLE, &id, NULL);
  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)
  47                 rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_ASSERT, &id, NULL);
  48         else
  49                 rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_DEASSERT, &id, NULL);
  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 {
  99         if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
 100                 return 0;
 101         else
 102                 return id;
 103 }
 104
 105 static unsigned pc_clk_is_enabled(unsigned id)
 106 {
 107         if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
 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
 125 struct clk_ops clk_ops_pcom = {
 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 };