2 * carl9170 firmware - used by the ar9170 wireless device
4 * Clock, Timer & Timing functions
6 * Copyright (c) 2000-2005 ZyDAS Technology Corporation
7 * Copyright (c) 2007-2009 Atheros Communications, Inc.
8 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 void timer_init(const unsigned int timer, const unsigned int interval)
34 /* Set timer to periodic mode */
35 orl(AR9170_TIMER_REG_CONTROL, BIT(timer));
37 /* Set time interval */
38 set(AR9170_TIMER_REG_TIMER0 + (timer << 2), interval - 1);
40 /* Clear timer interrupt flag */
41 orl(AR9170_TIMER_REG_INTERRUPT, BIT(timer));
44 static void clock_calibrate(void)
46 uint32_t t0, loop = 13;
48 t0 = get_clock_counter();
52 * Write this code in assembler, so the reading is accurate
53 * and can be used to correct the timer intervals.
55 while (((get_clock_counter() - t0) & (BIT(18)-1)) < 1000)
56 loop += 9; /* really rough uOP estimation */
61 void clock_set(const bool on, const enum cpu_clock_t _clock)
65 * This setting does more than just mess with the CPU Clock.
66 * So watch out, if you need _stable_ timer interrupts.
69 set(AR9170_PWR_REG_CLOCK_SEL, (uint32_t) ((on ? 0x70 : 0x600) | _clock));
73 static void timer0_isr(void)
77 #ifdef CONFIG_CARL9170FW_GPIO_INTERRUPT
79 #endif /* CONFIG_CARL9170FW_GPIO_INTERRUPT */
81 #ifdef CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT
82 set(AR9170_GPIO_REG_PORT_DATA, get(AR9170_GPIO_REG_PORT_DATA) ^ 1);
83 #endif /* CONFIG_CARL9170FW_DEBUG_LED_HEARTBEAT */
86 void handle_timer(void)
90 intr = get(AR9170_TIMER_REG_INTERRUPT);
92 /* ACK timer interrupt */
93 set(AR9170_TIMER_REG_INTERRUPT, intr);
95 #define HANDLER(intr, flag, func) \
97 if ((intr & flag) != 0) { \
103 HANDLER(intr, BIT(0), timer0_isr);
106 DBG("Unhandled Timer Event %x", (unsigned int) intr);