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  • only in /asuswrt-rt-n18u-9.0.0.4.380.2695/release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/stmmac/
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
29static 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) \
37printk(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>
41static struct rtc_device *stmmac_rtc;
42static rtc_task_t stmmac_task;
43
44static 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
50static void stmmac_rtc_stop(void)
51{
52	rtc_irq_set_state(stmmac_rtc, &stmmac_task, 0);
53}
54
55int 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
84int 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"
95static struct clk *timer_clock;
96
97static void stmmac_tmu_start(unsigned int new_freq)
98{
99	clk_set_rate(timer_clock, new_freq);
100	clk_enable(timer_clock);
101}
102
103static void stmmac_tmu_stop(void)
104{
105	clk_disable(timer_clock);
106}
107
108int 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
127int 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
135