3 * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 /* stuff specific for the sc520, but independent of implementation */
27 #include <asm/interrupt.h>
28 #include <asm/ic/sc520.h>
30 void sc520_timer_isr(void)
32 /* Ack the GP Timer Interrupt */
33 sc520_mmcr->gptmrsta = 0x02;
38 /* Register the SC520 specific timer interrupt handler */
39 register_timer_isr (sc520_timer_isr);
41 /* Install interrupt handler for GP Timer 1 */
42 irq_install_handler (0, timer_isr, NULL);
44 /* Map GP Timer 1 to Master PIC IR0 */
45 sc520_mmcr->gp_tmr_int_map[1] = 0x01;
47 /* Disable GP Timers 1 & 2 - Allow configuration writes */
48 sc520_mmcr->gptmr1ctl = 0x4000;
49 sc520_mmcr->gptmr2ctl = 0x4000;
51 /* Reset GP Timers 1 & 2 */
52 sc520_mmcr->gptmr1cnt = 0x0000;
53 sc520_mmcr->gptmr2cnt = 0x0000;
55 /* Setup GP Timer 2 as a 100kHz (10us) prescaler */
56 sc520_mmcr->gptmr2maxcmpa = 83;
57 sc520_mmcr->gptmr2ctl = 0xc001;
59 /* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
60 sc520_mmcr->gptmr1maxcmpa = 100;
61 sc520_mmcr->gptmr1ctl = 0xe009;
65 /* Clear the GP Timer 1 status register to get the show rolling*/
66 sc520_mmcr->gptmrsta = 0x02;
71 void udelay(unsigned long usec)
77 temp = sc520_mmcr->swtmrmilli;
78 temp = sc520_mmcr->swtmrmicro;
81 m += sc520_mmcr->swtmrmilli;
82 u = sc520_mmcr->swtmrmicro + (m * 1000);