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55 lines
1.6 KiB
55 lines
1.6 KiB
20 years ago
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/*
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* include/asm-v850/v850e_timer_d.c -- `Timer D' component often used
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* with V850E CPUs
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#include <linux/kernel.h>
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#include <asm/v850e_utils.h>
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#include <asm/v850e_timer_d.h>
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/* Start interval timer TIMER (0-3). The timer will issue the
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corresponding INTCMD interrupt RATE times per second.
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This function does not enable the interrupt. */
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void v850e_timer_d_configure (unsigned timer, unsigned rate)
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{
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unsigned divlog2, count;
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/* Calculate params for timer. */
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if (! calc_counter_params (
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V850E_TIMER_D_BASE_FREQ, rate,
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V850E_TIMER_D_TMCD_CS_MIN, V850E_TIMER_D_TMCD_CS_MAX, 16,
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&divlog2, &count))
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printk (KERN_WARNING
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"Cannot find interval timer %d setting suitable"
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" for rate of %dHz.\n"
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"Using rate of %dHz instead.\n",
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timer, rate,
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(V850E_TIMER_D_BASE_FREQ >> divlog2) >> 16);
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/* Do the actual hardware timer initialization: */
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/* Enable timer. */
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V850E_TIMER_D_TMCD(timer) = V850E_TIMER_D_TMCD_CAE;
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/* Set clock divider. */
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V850E_TIMER_D_TMCD(timer)
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= V850E_TIMER_D_TMCD_CAE
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| V850E_TIMER_D_TMCD_CS(divlog2);
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/* Set timer compare register. */
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V850E_TIMER_D_CMD(timer) = count;
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/* Start counting. */
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V850E_TIMER_D_TMCD(timer)
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= V850E_TIMER_D_TMCD_CAE
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| V850E_TIMER_D_TMCD_CS(divlog2)
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| V850E_TIMER_D_TMCD_CE;
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}
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