drivers/net/stmmac/stmmac_timer.c

   1 /*******************************************************************************
   2   STMMAC external timer support.
   3
   4   Copyright (C) 2007-2009  STMicroelectronics Ltd
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  23 *******************************************************************************/
  24
  25 #include <linux/kernel.h>
  26 #include <linux/etherdevice.h>
  27 #include "stmmac_timer.h"
  28
  29 static void stmmac_timer_handler(void *data)
  30 {
  31         struct net_device *dev = (struct net_device *)data;
  32
  33         stmmac_schedule(dev);
  34
  35         return;
  36 }
  37
  38 #define STMMAC_TIMER_MSG(timer, freq) \
  39 printk(KERN_INFO "stmmac_timer: %s Timer ON (freq %dHz)\n", timer, freq);
  40
  41 #if defined(CONFIG_STMMAC_RTC_TIMER)
  42 #include <linux/rtc.h>
  43 static struct rtc_device *stmmac_rtc;
  44 static rtc_task_t stmmac_task;
  45
  46 static void stmmac_rtc_start(unsigned int new_freq)
  47 {
  48         rtc_irq_set_freq(stmmac_rtc, &stmmac_task, new_freq);
  49         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 1);
  50         return;
  51 }
  52
  53 static void stmmac_rtc_stop(void)
  54 {
  55         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
  56         return;
  57 }
  58
  59 int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
  60 {
  61         stmmac_task.private_data = dev;
  62         stmmac_task.func = stmmac_timer_handler;
  63
  64         stmmac_rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
  65         if (stmmac_rtc == NULL) {
  66                 pr_err("open rtc device failed\n");
  67                 return -ENODEV;
  68         }
  69
  70         rtc_irq_register(stmmac_rtc, &stmmac_task);
  71
  72         /* Periodic mode is not supported */
  73         if ((rtc_irq_set_freq(stmmac_rtc, &stmmac_task, tm->freq) < 0)) {
  74                 pr_err("set periodic failed\n");
  75                 rtc_irq_unregister(stmmac_rtc, &stmmac_task);
  76                 rtc_class_close(stmmac_rtc);
  77                 return -1;
  78         }
  79
  80         STMMAC_TIMER_MSG(CONFIG_RTC_HCTOSYS_DEVICE, tm->freq);
  81
  82         tm->timer_start = stmmac_rtc_start;
  83         tm->timer_stop = stmmac_rtc_stop;
  84
  85         return 0;
  86 }
  87
  88 int stmmac_close_ext_timer(void)
  89 {
  90         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
  91         rtc_irq_unregister(stmmac_rtc, &stmmac_task);
  92         rtc_class_close(stmmac_rtc);
  93         return 0;
  94 }
  95
  96 #elif defined(CONFIG_STMMAC_TMU_TIMER)
  97 #include <linux/clk.h>
  98 #define TMU_CHANNEL "tmu2_clk"
  99 static struct clk *timer_clock;
 100
 101 static void stmmac_tmu_start(unsigned int new_freq)
 102 {
 103         clk_set_rate(timer_clock, new_freq);
 104         clk_enable(timer_clock);
 105         return;
 106 }
 107
 108 static void stmmac_tmu_stop(void)
 109 {
 110         clk_disable(timer_clock);
 111         return;
 112 }
 113
 114 int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
 115 {
 116         timer_clock = clk_get(NULL, TMU_CHANNEL);
 117
 118         if (timer_clock == NULL)
 119                 return -1;
 120
 121         if (tmu2_register_user(stmmac_timer_handler, (void *)dev) < 0) {
 122                 timer_clock = NULL;
 123                 return -1;
 124         }
 125
 126         STMMAC_TIMER_MSG("TMU2", tm->freq);
 127         tm->timer_start = stmmac_tmu_start;
 128         tm->timer_stop = stmmac_tmu_stop;
 129
 130         return 0;
 131 }
 132
 133 int stmmac_close_ext_timer(void)
 134 {
 135         clk_disable(timer_clock);
 136         tmu2_unregister_user();
 137         clk_put(timer_clock);
 138         return 0;
 139 }
 140 #endif