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
  24 /*
  25  * glue for the proc_comm interface
  26  */
  27 int pc_clk_enable(unsigned id)
  28 {
  29         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_ENABLE, &id, NULL);
  30         if (rc < 0)
  31                 return rc;
  32         else
  33                 return (int)id < 0 ? -EINVAL : 0;
  34 }
  35
  36 void pc_clk_disable(unsigned id)
  37 {
  38         msm_proc_comm(PCOM_CLKCTL_RPC_DISABLE, &id, NULL);
  39 }
  40
  41 int pc_clk_reset(unsigned id, enum clk_reset_action action)
  42 {
  43         int rc;
  44
  45         if (action == CLK_RESET_ASSERT)
  46                 rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_ASSERT, &id, NULL);
  47         else
  48                 rc = msm_proc_comm(PCOM_CLKCTL_RPC_RESET_DEASSERT, &id, NULL);
  49
  50         if (rc < 0)
  51                 return rc;
  52         else
  53                 return (int)id < 0 ? -EINVAL : 0;
  54 }
  55
  56 int pc_clk_set_rate(unsigned id, unsigned rate)
  57 {
  58         /* The rate _might_ be rounded off to the nearest KHz value by the
  59          * remote function. So a return value of 0 doesn't necessarily mean
  60          * that the exact rate was set successfully.
  61          */
  62         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_RATE, &id, &rate);
  63         if (rc < 0)
  64                 return rc;
  65         else
  66                 return (int)id < 0 ? -EINVAL : 0;
  67 }
  68
  69 int pc_clk_set_min_rate(unsigned id, unsigned rate)
  70 {
  71         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MIN_RATE, &id, &rate);
  72         if (rc < 0)
  73                 return rc;
  74         else
  75                 return (int)id < 0 ? -EINVAL : 0;
  76 }
  77
  78 int pc_clk_set_max_rate(unsigned id, unsigned rate)
  79 {
  80         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_MAX_RATE, &id, &rate);
  81         if (rc < 0)
  82                 return rc;
  83         else
  84                 return (int)id < 0 ? -EINVAL : 0;
  85 }
  86
  87 int pc_clk_set_flags(unsigned id, unsigned flags)
  88 {
  89         int rc = msm_proc_comm(PCOM_CLKCTL_RPC_SET_FLAGS, &id, &flags);
  90         if (rc < 0)
  91                 return rc;
  92         else
  93                 return (int)id < 0 ? -EINVAL : 0;
  94 }
  95
  96 unsigned pc_clk_get_rate(unsigned id)
  97 {
  98         if (msm_proc_comm(PCOM_CLKCTL_RPC_RATE, &id, NULL))
  99                 return 0;
 100         else
 101                 return id;
 102 }
 103
 104 unsigned pc_clk_is_enabled(unsigned id)
 105 {
 106         if (msm_proc_comm(PCOM_CLKCTL_RPC_ENABLED, &id, NULL))
 107                 return 0;
 108         else
 109                 return id;
 110 }
 111
 112 long pc_clk_round_rate(unsigned id, unsigned rate)
 113 {
 114
 115         /* Not really supported; pc_clk_set_rate() does rounding on it's own. */
 116         return rate;
 117 }
 118
 119 struct clk_ops clk_ops_pcom = {
 120         .enable = pc_clk_enable,
 121         .disable = pc_clk_disable,
 122         .auto_off = pc_clk_disable,
 123         .reset = pc_clk_reset,
 124         .set_rate = pc_clk_set_rate,
 125         .set_min_rate = pc_clk_set_min_rate,
 126         .set_max_rate = pc_clk_set_max_rate,
 127         .set_flags = pc_clk_set_flags,
 128         .get_rate = pc_clk_get_rate,
 129         .is_enabled = pc_clk_is_enabled,
 130         .round_rate = pc_clk_round_rate,
 131 };