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 */
28 #include <asm/interrupt.h>
29 #include <asm/ic/sc520.h>
31 void sc520_timer_isr(void)
33 /* Ack the GP Timer Interrupt */
34 writeb(0x02, &sc520_mmcr->gptmrsta);
39 /* Register the SC520 specific timer interrupt handler */
40 register_timer_isr (sc520_timer_isr);
42 /* Install interrupt handler for GP Timer 1 */
43 irq_install_handler (0, timer_isr, NULL);
45 /* Map GP Timer 1 to Master PIC IR0 */
46 writeb(0x01, &sc520_mmcr->gp_tmr_int_map[1]);
48 /* Disable GP Timers 1 & 2 - Allow configuration writes */
49 writew(0x4000, &sc520_mmcr->gptmr1ctl);
50 writew(0x4000, &sc520_mmcr->gptmr2ctl);
52 /* Reset GP Timers 1 & 2 */
53 writew(0x0000, &sc520_mmcr->gptmr1cnt);
54 writew(0x0000, &sc520_mmcr->gptmr2cnt);
56 /* Setup GP Timer 2 as a 100kHz (10us) prescaler */
57 writew(83, &sc520_mmcr->gptmr2maxcmpa);
58 writew(0xc001, &sc520_mmcr->gptmr2ctl);
60 /* Setup GP Timer 1 as a 1000 Hz (1ms) interrupt generator */
61 writew(100, &sc520_mmcr->gptmr1maxcmpa);
62 writew(0xe009, &sc520_mmcr->gptmr1ctl);
66 /* Clear the GP Timer 1 status register to get the show rolling*/
67 writeb(0x02, &sc520_mmcr->gptmrsta);
72 void __udelay(unsigned long usec)
78 temp = readw(&sc520_mmcr->swtmrmilli);
79 temp = readw(&sc520_mmcr->swtmrmicro);
82 m += readw(&sc520_mmcr->swtmrmilli);
83 u = readw(&sc520_mmcr->swtmrmicro) + (m * 1000);