buddha.c
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上传日期:2013-02-24
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- /*
- * linux/drivers/ide/buddha.c -- Amiga Buddha, Catweasel and X-Surf IDE Driver
- *
- * Copyright (C) 1997 by Geert Uytterhoeven
- *
- * This driver was written by based on the specifications in README.buddha and
- * the X-Surf info from Inside_XSurf.txt available at
- * http://www.jschoenfeld.com
- *
- * 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.
- *
- * TODO:
- * - test it :-)
- * - tune the timings using the speed-register
- */
- #include <linux/types.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/blkdev.h>
- #include <linux/hdreg.h>
- #include <linux/zorro.h>
- #include <linux/ide.h>
- #include <linux/init.h>
- #include <asm/amigahw.h>
- #include <asm/amigaints.h>
- /*
- * The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
- */
- #define BUDDHA_NUM_HWIFS 2
- #define CATWEASEL_NUM_HWIFS 3
- #define XSURF_NUM_HWIFS 2
- /*
- * Bases of the IDE interfaces (relative to the board address)
- */
- #define BUDDHA_BASE1 0x800
- #define BUDDHA_BASE2 0xa00
- #define BUDDHA_BASE3 0xc00
- #define XSURF_BASE1 0xb000 /* 2.5" Interface */
- #define XSURF_BASE2 0xd000 /* 3.5" Interface */
- static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
- BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
- };
- static const u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
- XSURF_BASE1, XSURF_BASE2
- };
- /*
- * Offsets from one of the above bases
- */
- #define BUDDHA_DATA 0x00
- #define BUDDHA_ERROR 0x06 /* see err-bits */
- #define BUDDHA_NSECTOR 0x0a /* nr of sectors to read/write */
- #define BUDDHA_SECTOR 0x0e /* starting sector */
- #define BUDDHA_LCYL 0x12 /* starting cylinder */
- #define BUDDHA_HCYL 0x16 /* high byte of starting cyl */
- #define BUDDHA_SELECT 0x1a /* 101dhhhh , d=drive, hhhh=head */
- #define BUDDHA_STATUS 0x1e /* see status-bits */
- #define BUDDHA_CONTROL 0x11a
- #define XSURF_CONTROL -1 /* X-Surf has no CS1* (Control/AltStat) */
- static int buddha_offsets[IDE_NR_PORTS] __initdata = {
- BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
- BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, BUDDHA_CONTROL, -1
- };
- static int xsurf_offsets[IDE_NR_PORTS] __initdata = {
- BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
- BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, XSURF_CONTROL, -1
- };
- /*
- * Other registers
- */
- #define BUDDHA_IRQ1 0xf00 /* MSB = 1, Harddisk is source of */
- #define BUDDHA_IRQ2 0xf40 /* interrupt */
- #define BUDDHA_IRQ3 0xf80
- #define XSURF_IRQ1 0x7e
- #define XSURF_IRQ2 0x7e
- static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
- BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
- };
- static const int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
- XSURF_IRQ1, XSURF_IRQ2
- };
- #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */
- /*
- * Board information
- */
- enum BuddhaType_Enum {BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF};
- typedef enum BuddhaType_Enum BuddhaType;
- /*
- * Check and acknowledge the interrupt status
- */
- static int buddha_ack_intr(ide_hwif_t *hwif)
- {
- unsigned char ch;
- ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
- if (!(ch & 0x80))
- return 0;
- return 1;
- }
- static int xsurf_ack_intr(ide_hwif_t *hwif)
- {
- unsigned char ch;
- ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
- /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
- z_writeb(0, hwif->io_ports[IDE_IRQ_OFFSET]);
- if (!(ch & 0x80))
- return 0;
- return 1;
- }
- /*
- * Probe for a Buddha or Catweasel IDE interface
- */
- void __init buddha_init(void)
- {
- hw_regs_t hw;
- int i, index;
- struct zorro_dev *z = NULL;
- u_long buddha_board = 0;
- BuddhaType type;
- int buddha_num_hwifs;
- while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
- unsigned long board;
- if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
- buddha_num_hwifs = BUDDHA_NUM_HWIFS;
- type=BOARD_BUDDHA;
- } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
- buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
- type=BOARD_CATWEASEL;
- } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
- buddha_num_hwifs = XSURF_NUM_HWIFS;
- type=BOARD_XSURF;
- } else
- continue;
-
- board = z->resource.start;
-
- if(type != BOARD_XSURF) {
- if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
- continue;
- } else {
- if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
- continue;
- if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
- continue;
- if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE"))
- continue;
- }
- buddha_board = ZTWO_VADDR(board);
-
- /* write to BUDDHA_IRQ_MR to enable the board IRQ */
- /* X-Surf doesn't have this. IRQs are always on */
- if(type != BOARD_XSURF) *(char *)(buddha_board+BUDDHA_IRQ_MR) = 0;
-
- for(i=0;i<buddha_num_hwifs;i++) {
- if(type != BOARD_XSURF) {
- ide_setup_ports(&hw, (ide_ioreg_t)(buddha_board+buddha_bases[i]),
- buddha_offsets, 0,
- (ide_ioreg_t)(buddha_board+buddha_irqports[i]),
- buddha_ack_intr, IRQ_AMIGA_PORTS);
- } else {
- ide_setup_ports(&hw, (ide_ioreg_t)(buddha_board+xsurf_bases[i]),
- xsurf_offsets, 0,
- (ide_ioreg_t)(buddha_board+xsurf_irqports[i]),
- xsurf_ack_intr, IRQ_AMIGA_PORTS);
- }
-
- index = ide_register_hw(&hw, NULL);
- if (index != -1) {
- printk("ide%d: ", index);
- switch(type) {
- case BOARD_BUDDHA:
- printk("Buddha");
- break;
- case BOARD_CATWEASEL:
- printk("Catweasel");
- break;
- case BOARD_XSURF:
- printk("X-Surf");
- break;
- }
- printk(" IDE interfacen");
- }
- }
- }
- }