gayle.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:5k
- /*
- * linux/drivers/ide/gayle.c -- Amiga Gayle IDE Driver
- *
- * Created 9 Jul 1997 by Geert Uytterhoeven
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive for
- * more details.
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/blkdev.h>
- #include <linux/hdreg.h>
- #include <linux/ide.h>
- #include <linux/init.h>
- #include <asm/setup.h>
- #include <asm/amigahw.h>
- #include <asm/amigaints.h>
- #include <asm/amigayle.h>
- /*
- * Bases of the IDE interfaces
- */
- #define GAYLE_BASE_4000 0xdd2020 /* A4000/A4000T */
- #define GAYLE_BASE_1200 0xda0000 /* A1200/A600 */
- /*
- * Offsets from one of the above bases
- */
- #define GAYLE_DATA 0x00
- #define GAYLE_ERROR 0x06 /* see err-bits */
- #define GAYLE_NSECTOR 0x0a /* nr of sectors to read/write */
- #define GAYLE_SECTOR 0x0e /* starting sector */
- #define GAYLE_LCYL 0x12 /* starting cylinder */
- #define GAYLE_HCYL 0x16 /* high byte of starting cyl */
- #define GAYLE_SELECT 0x1a /* 101dhhhh , d=drive, hhhh=head */
- #define GAYLE_STATUS 0x1e /* see status-bits */
- #define GAYLE_CONTROL 0x101a
- static int gayle_offsets[IDE_NR_PORTS] __initdata = {
- GAYLE_DATA, GAYLE_ERROR, GAYLE_NSECTOR, GAYLE_SECTOR, GAYLE_LCYL,
- GAYLE_HCYL, GAYLE_SELECT, GAYLE_STATUS, -1, -1
- };
- /*
- * These are at different offsets from the base
- */
- #define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */
- #define GAYLE_IRQ_1200 0xda9000 /* interrupt */
- /*
- * Offset of the secondary port for IDE doublers
- * Note that GAYLE_CONTROL is NOT available then!
- */
- #define GAYLE_NEXT_PORT 0x1000
- #ifndef CONFIG_BLK_DEV_IDEDOUBLER
- #define GAYLE_NUM_HWIFS 1
- #define GAYLE_NUM_PROBE_HWIFS GAYLE_NUM_HWIFS
- #define GAYLE_HAS_CONTROL_REG 1
- #define GAYLE_IDEREG_SIZE 0x2000
- #else /* CONFIG_BLK_DEV_IDEDOUBLER */
- #define GAYLE_NUM_HWIFS 2
- #define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS :
- GAYLE_NUM_HWIFS-1)
- #define GAYLE_HAS_CONTROL_REG (!ide_doubler)
- #define GAYLE_IDEREG_SIZE (ide_doubler ? 0x1000 : 0x2000)
- int ide_doubler = 0; /* support IDE doublers? */
- #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
- /*
- * Check and acknowledge the interrupt status
- */
- static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
- {
- unsigned char ch;
- ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
- if (!(ch & GAYLE_IRQ_IDE))
- return 0;
- return 1;
- }
- static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
- {
- unsigned char ch;
- ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
- if (!(ch & GAYLE_IRQ_IDE))
- return 0;
- (void)inb(hwif->io_ports[IDE_STATUS_OFFSET]);
- outb(0x7c, hwif->io_ports[IDE_IRQ_OFFSET]);
- return 1;
- }
- /*
- * Probe for a Gayle IDE interface (and optionally for an IDE doubler)
- */
- void __init gayle_init(void)
- {
- int a4000, i;
- if (!MACH_IS_AMIGA)
- return;
- if (!(a4000 = AMIGAHW_PRESENT(A4000_IDE)) && !AMIGAHW_PRESENT(A1200_IDE))
- return;
- for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
- ide_ioreg_t base, ctrlport, irqport;
- ide_ack_intr_t *ack_intr;
- hw_regs_t hw;
- int index;
- unsigned long phys_base, res_start, res_n;
- if (a4000) {
- phys_base = GAYLE_BASE_4000;
- irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_4000);
- ack_intr = gayle_ack_intr_a4000;
- } else {
- phys_base = GAYLE_BASE_1200;
- irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_1200);
- ack_intr = gayle_ack_intr_a1200;
- }
- phys_base += i*GAYLE_NEXT_PORT;
- res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
- res_n = GAYLE_IDEREG_SIZE;
- if (!request_mem_region(res_start, res_n, "IDE"))
- continue;
- base = (ide_ioreg_t)ZTWO_VADDR(phys_base);
- ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
- ide_setup_ports(&hw, base, gayle_offsets,
- ctrlport, irqport, ack_intr, IRQ_AMIGA_PORTS);
- index = ide_register_hw(&hw, NULL);
- if (index != -1) {
- switch (i) {
- case 0:
- printk("ide%d: Gayle IDE interface (A%d style)n", index,
- a4000 ? 4000 : 1200);
- break;
- #ifdef CONFIG_BLK_DEV_IDEDOUBLER
- case 1:
- printk("ide%d: IDE doublern", index);
- break;
- #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
- }
- } else
- release_mem_region(res_start, res_n);
- #if 1 /* TESTING */
- if (i == 1) {
- volatile u_short *addr = (u_short *)base;
- u_short data;
- printk("+++ Probing for IDE doubler... ");
- *addr = 0xffff;
- data = *addr;
- printk("probe returned 0x%02x (PLEASE REPORT THIS!!)n", data);
- }
- #endif /* TESTING */
- }
- }