mirror of https://gitee.com/openkylin/linux.git
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*******************************************************************************
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STMMAC external timer support.
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Copyright (C) 2007-2009 STMicroelectronics Ltd
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include <linux/kernel.h>
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#include <linux/etherdevice.h>
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#include "stmmac_timer.h"
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static void stmmac_timer_handler(void *data)
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{
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struct net_device *dev = (struct net_device *)data;
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stmmac_schedule(dev);
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return;
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}
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#define STMMAC_TIMER_MSG(timer, freq) \
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printk(KERN_INFO "stmmac_timer: %s Timer ON (freq %dHz)\n", timer, freq);
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#if defined(CONFIG_STMMAC_RTC_TIMER)
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#include <linux/rtc.h>
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static struct rtc_device *stmmac_rtc;
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static rtc_task_t stmmac_task;
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static void stmmac_rtc_start(unsigned int new_freq)
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{
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rtc_irq_set_freq(stmmac_rtc, &stmmac_task, new_freq);
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rtc_irq_set_state(stmmac_rtc, &stmmac_task, 1);
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return;
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}
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static void stmmac_rtc_stop(void)
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{
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rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
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return;
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}
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int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
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{
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stmmac_task.private_data = dev;
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stmmac_task.func = stmmac_timer_handler;
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stmmac_rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
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if (stmmac_rtc == NULL) {
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pr_error("open rtc device failed\n");
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return -ENODEV;
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}
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rtc_irq_register(stmmac_rtc, &stmmac_task);
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/* Periodic mode is not supported */
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if ((rtc_irq_set_freq(stmmac_rtc, &stmmac_task, tm->freq) < 0)) {
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pr_error("set periodic failed\n");
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rtc_irq_unregister(stmmac_rtc, &stmmac_task);
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rtc_class_close(stmmac_rtc);
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return -1;
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}
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STMMAC_TIMER_MSG(CONFIG_RTC_HCTOSYS_DEVICE, tm->freq);
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tm->timer_start = stmmac_rtc_start;
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tm->timer_stop = stmmac_rtc_stop;
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return 0;
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}
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int stmmac_close_ext_timer(void)
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{
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rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
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rtc_irq_unregister(stmmac_rtc, &stmmac_task);
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rtc_class_close(stmmac_rtc);
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return 0;
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}
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#elif defined(CONFIG_STMMAC_TMU_TIMER)
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#include <linux/clk.h>
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#define TMU_CHANNEL "tmu2_clk"
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static struct clk *timer_clock;
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static void stmmac_tmu_start(unsigned int new_freq)
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{
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clk_set_rate(timer_clock, new_freq);
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clk_enable(timer_clock);
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return;
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}
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static void stmmac_tmu_stop(void)
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{
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clk_disable(timer_clock);
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return;
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}
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int stmmac_open_ext_timer(struct net_device *dev, struct stmmac_timer *tm)
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{
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timer_clock = clk_get(NULL, TMU_CHANNEL);
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if (timer_clock == NULL)
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return -1;
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if (tmu2_register_user(stmmac_timer_handler, (void *)dev) < 0) {
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timer_clock = NULL;
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return -1;
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}
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STMMAC_TIMER_MSG("TMU2", tm->freq);
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tm->timer_start = stmmac_tmu_start;
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tm->timer_stop = stmmac_tmu_stop;
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return 0;
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}
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int stmmac_close_ext_timer(void)
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{
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clk_disable(timer_clock);
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tmu2_unregister_user();
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clk_put(timer_clock);
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return 0;
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}
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#endif
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