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
  36 #define STMMAC_TIMER_MSG(timer, freq) \
  37 printk(KERN_INFO "stmmac_timer: %s Timer ON (freq %dHz)\n", timer, freq);
  38
  39 #if defined(CONFIG_STMMAC_RTC_TIMER)
  40 #include <linux/rtc.h>
  41 static struct rtc_device *stmmac_rtc;
  42 static rtc_task_t stmmac_task;
  43
  44 static void stmmac_rtc_start(unsigned int new_freq)
  45 {
  46         rtc_irq_set_freq(stmmac_rtc, &stmmac_task, new_freq);
  47         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 1);
  48 }
  49
  50 static void stmmac_rtc_stop(void)
  51 {
  52         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
  53 }
  54
  55 int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
  56 {
  57         stmmac_task.private_data = dev;
  58         stmmac_task.func = stmmac_timer_handler;
  59
  60         stmmac_rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
  61         if (stmmac_rtc == NULL) {
  62                 pr_err("open rtc device failed\n");
  63                 return -ENODEV;
  64         }
  65
  66         rtc_irq_register(stmmac_rtc, &stmmac_task);
  67
  68         /* Periodic mode is not supported */
  69         if ((rtc_irq_set_freq(stmmac_rtc, &stmmac_task, tm->freq) < 0)) {
  70                 pr_err("set periodic failed\n");
  71                 rtc_irq_unregister(stmmac_rtc, &stmmac_task);
  72                 rtc_class_close(stmmac_rtc);
  73                 return -1;
  74         }
  75
  76         STMMAC_TIMER_MSG(CONFIG_RTC_HCTOSYS_DEVICE, tm->freq);
  77
  78         tm->timer_start = stmmac_rtc_start;
  79         tm->timer_stop = stmmac_rtc_stop;
  80
  81         return 0;
  82 }
  83
  84 int stmmac_close_ext_timer(void)
  85 {
  86         rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
  87         rtc_irq_unregister(stmmac_rtc, &stmmac_task);
  88         rtc_class_close(stmmac_rtc);
  89         return 0;
  90 }
  91
  92 #elif defined(CONFIG_STMMAC_TMU_TIMER)
  93 #include <linux/clk.h>
  94 #define TMU_CHANNEL "tmu2_clk"
  95 static struct clk *timer_clock;
  96
  97 static void stmmac_tmu_start(unsigned int new_freq)
  98 {
  99         clk_set_rate(timer_clock, new_freq);
 100         clk_enable(timer_clock);
 101 }
 102
 103 static void stmmac_tmu_stop(void)
 104 {
 105         clk_disable(timer_clock);
 106 }
 107
 108 int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
 109 {
 110         timer_clock = clk_get(NULL, TMU_CHANNEL);
 111
 112         if (timer_clock == NULL)
 113                 return -1;
 114
 115         if (tmu2_register_user(stmmac_timer_handler, (void *)dev) < 0) {
 116                 timer_clock = NULL;
 117                 return -1;
 118         }
 119
 120         STMMAC_TIMER_MSG("TMU2", tm->freq);
 121         tm->timer_start = stmmac_tmu_start;
 122         tm->timer_stop = stmmac_tmu_stop;
 123
 124         return 0;
 125 }
 126
 127 int stmmac_close_ext_timer(void)
 128 {
 129         clk_disable(timer_clock);
 130         tmu2_unregister_user();
 131         clk_put(timer_clock);
 132         return 0;
 133 }
 134 #endif