ide.h

嵌入式系统设计与实验教材二源码linux内核移植与编译

/*
 * 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.
 *
 * This file contains the MIPS architecture specific IDE code.
 *
 * Copyright (C) 1994-1996  Linus Torvalds & authors
 */

#ifndef __ASM_IDE_H
#define __ASM_IDE_H

#ifdef __KERNEL__

#include <linux/config.h>
#include <asm/io.h>

#ifndef MAX_HWIFS
# ifdef CONFIG_BLK_DEV_IDEPCI
#define MAX_HWIFS	10
# else
#define MAX_HWIFS	6
# endif
#endif

#define ide__sti()	__sti()

struct ide_ops {
	int (*ide_default_irq)(ide_ioreg_t base);
	ide_ioreg_t (*ide_default_io_base)(int index);
	void (*ide_init_hwif_ports)(hw_regs_t *hw, ide_ioreg_t data_port,
				    ide_ioreg_t ctrl_port, int *irq);
	int (*ide_request_irq)(unsigned int irq, void (*handler)(int, void *,
	                       struct pt_regs *), unsigned long flags,
	                       const char *device, void *dev_id);
	void (*ide_free_irq)(unsigned int irq, void *dev_id);
	int (*ide_check_region) (ide_ioreg_t from, unsigned int extent);
	void (*ide_request_region)(ide_ioreg_t from, unsigned int extent,
	                        const char *name);
	void (*ide_release_region)(ide_ioreg_t from, unsigned int extent);
};

extern struct ide_ops *ide_ops;

static __inline__ int ide_default_irq(ide_ioreg_t base)
{
	return ide_ops->ide_default_irq(base);
}

static __inline__ ide_ioreg_t ide_default_io_base(int index)
{
	return ide_ops->ide_default_io_base(index);
}

static inline void ide_init_hwif_ports(hw_regs_t *hw, ide_ioreg_t data_port,
                                       ide_ioreg_t ctrl_port, int *irq)
{
	ide_ops->ide_init_hwif_ports(hw, data_port, ctrl_port, irq);
}

static __inline__ void ide_init_default_hwifs(void)
{
#ifndef CONFIG_BLK_DEV_IDEPCI
	hw_regs_t hw;
	int index;

	for(index = 0; index < MAX_HWIFS; index++) {
		ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, NULL);
		hw.irq = ide_default_irq(ide_default_io_base(index));
		ide_register_hw(&hw, NULL);
	}
#endif /* CONFIG_BLK_DEV_IDEPCI */
}

typedef union {
	unsigned all			: 8;	/* all of the bits together */
	struct {
#ifdef __MIPSEB__
		unsigned bit7		: 1;	/* always 1 */
		unsigned lba		: 1;	/* using LBA instead of CHS */
		unsigned bit5		: 1;	/* always 1 */
		unsigned unit		: 1;	/* drive select number, 0 or 1 */
		unsigned head		: 4;	/* always zeros here */
#else
		unsigned head		: 4;	/* always zeros here */
		unsigned unit		: 1;	/* drive select number, 0 or 1 */
		unsigned bit5		: 1;	/* always 1 */
		unsigned lba		: 1;	/* using LBA instead of CHS */
		unsigned bit7		: 1;	/* always 1 */
#endif
	} b;
} select_t;

static __inline__ int ide_request_irq(unsigned int irq, void (*handler)(int,void *, struct pt_regs *),
			unsigned long flags, const char *device, void *dev_id)
{
	return ide_ops->ide_request_irq(irq, handler, flags, device, dev_id);
}

static __inline__ void ide_free_irq(unsigned int irq, void *dev_id)
{
	ide_ops->ide_free_irq(irq, dev_id);
}

static __inline__ int ide_check_region (ide_ioreg_t from, unsigned int extent)
{
	return ide_ops->ide_check_region(from, extent);
}

static __inline__ void ide_request_region(ide_ioreg_t from,
                                          unsigned int extent, const char *name)
{
	ide_ops->ide_request_region(from, extent, name);
}

static __inline__ void ide_release_region(ide_ioreg_t from,
                                          unsigned int extent)
{
	ide_ops->ide_release_region(from, extent);
}

#undef  SUPPORT_VLB_SYNC
#define SUPPORT_VLB_SYNC 0

#if defined(__MIPSEB__)

#define T_CHAR          (0x0000)        /* char:  don't touch  */
#define T_SHORT         (0x4000)        /* short: 12 -> 21     */
#define T_INT           (0x8000)        /* int:   1234 -> 4321 */
#define T_TEXT          (0xc000)        /* text:  12 -> 21     */

#define T_MASK_TYPE     (0xc000)
#define T_MASK_COUNT    (0x3fff)

#define D_CHAR(cnt)     (T_CHAR  | (cnt))
#define D_SHORT(cnt)    (T_SHORT | (cnt))
#define D_INT(cnt)      (T_INT   | (cnt))
#define D_TEXT(cnt)     (T_TEXT  | (cnt))

static u_short driveid_types[] = {
	D_SHORT(10),	/* config - vendor2 */
	D_TEXT(20),	/* serial_no */
	D_SHORT(3),	/* buf_type - ecc_bytes */
	D_TEXT(48),	/* fw_rev - model */
	D_CHAR(2),	/* max_multsect - vendor3 */
	D_SHORT(1),	/* dword_io */
	D_CHAR(2),	/* vendor4 - capability */
	D_SHORT(1),	/* reserved50 */
	D_CHAR(4),	/* vendor5 - tDMA */
	D_SHORT(4),	/* field_valid - cur_sectors */
	D_INT(1),	/* cur_capacity */
	D_CHAR(2),	/* multsect - multsect_valid */
	D_INT(1),	/* lba_capacity */
	D_SHORT(194)	/* dma_1word - reservedyy */
};

#define num_driveid_types       (sizeof(driveid_types)/sizeof(*driveid_types))

static __inline__ void ide_fix_driveid(struct hd_driveid *id)
{
	u_char *p = (u_char *)id;
	int i, j, cnt;
	u_char t;

	for (i = 0; i < num_driveid_types; i++) {
		cnt = driveid_types[i] & T_MASK_COUNT;
		switch (driveid_types[i] & T_MASK_TYPE) {
		case T_CHAR:
			p += cnt;
			break;
		case T_SHORT:
			for (j = 0; j < cnt; j++) {
				t = p[0];
				p[0] = p[1];
				p[1] = t;
				p += 2;
			}
			break;
		case T_INT:
			for (j = 0; j < cnt; j++) {
				t = p[0];
				p[0] = p[3];
				p[3] = t;
				t = p[1];
				p[1] = p[2];
				p[2] = t;
				p += 4;
			}
			break;
		case T_TEXT:
			for (j = 0; j < cnt; j += 2) {
				t = p[0];
				p[0] = p[1];
				p[1] = t;
				p += 2;
			}
			break;
		};
	}
}

#else /* defined(CONFIG_SWAP_IO_SPACE) && defined(__MIPSEB__)  */

#define ide_fix_driveid(id)		do {} while (0)

#endif

/*
 * The following are not needed for the non-m68k ports
 */
#define ide_ack_intr(hwif)		(1)
#define ide_release_lock(lock)		do {} while (0)
#define ide_get_lock(lock, hdlr, data)	do {} while (0)

#endif /* __KERNEL__ */

#endif /* __ASM_IDE_H */