ide.h
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上传日期:2013-02-24
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文件大小:4k
- /*
- * linux/include/asm-cris/ide.h
- *
- * Copyright (C) 2000 Axis Communications AB
- *
- * Authors: Bjorn Wesen
- *
- */
- /*
- * This file contains the ETRAX 100LX specific IDE code.
- */
- #ifndef __ASMCRIS_IDE_H
- #define __ASMCRIS_IDE_H
- #ifdef __KERNEL__
- #include <asm/svinto.h>
- /* ETRAX 100 can support 4 IDE busses on the same pins (serialized) */
- #define MAX_HWIFS 4
- #define ide__sti() __sti()
- static __inline__ int ide_default_irq(ide_ioreg_t base)
- {
- /* all IDE busses share the same IRQ, number 4.
- * this has the side-effect that ide-probe.c will cluster our 4 interfaces
- * together in a hwgroup, and will serialize accesses. this is good, because
- * we can't access more than one interface at the same time on ETRAX100.
- */
- return 4;
- }
- static __inline__ ide_ioreg_t ide_default_io_base(int index)
- {
- /* we have no real I/O base address per interface, since all go through the
- * same register. but in a bitfield in that register, we have the i/f number.
- * so we can use the io_base to remember that bitfield.
- */
- static const unsigned long io_bases[MAX_HWIFS] = {
- IO_FIELD(R_ATA_CTRL_DATA, sel, 0),
- IO_FIELD(R_ATA_CTRL_DATA, sel, 1),
- IO_FIELD(R_ATA_CTRL_DATA, sel, 2),
- IO_FIELD(R_ATA_CTRL_DATA, sel, 3)
- };
- return io_bases[index];
- }
- /* this is called once for each interface, to setup the port addresses. data_port is the result
- * of the ide_default_io_base call above. ctrl_port will be 0, but that is don't care for us.
- */
- static __inline__ void ide_init_hwif_ports(hw_regs_t *hw, ide_ioreg_t data_port, ide_ioreg_t ctrl_port, int *irq)
- {
- int i;
- /* fill in ports for ATA addresses 0 to 7 */
- for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
- hw->io_ports[i] = data_port |
- IO_FIELD(R_ATA_CTRL_DATA, addr, i) |
- IO_STATE(R_ATA_CTRL_DATA, cs0, active);
- }
- /* the IDE control register is at ATA address 6, with CS1 active instead of CS0 */
- hw->io_ports[IDE_CONTROL_OFFSET] = data_port |
- IO_FIELD(R_ATA_CTRL_DATA, addr, 6) |
- IO_STATE(R_ATA_CTRL_DATA, cs1, active);
- /* whats this for ? */
- hw->io_ports[IDE_IRQ_OFFSET] = 0;
- }
- static __inline__ void ide_init_default_hwifs(void)
- {
- 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);
- }
- }
- typedef union {
- unsigned all : 8; /* all of the bits together */
- struct {
- 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 */
- } b;
- } select_t;
- /* some configuration options we don't need */
- #undef SUPPORT_VLB_SYNC
- #define SUPPORT_VLB_SYNC 0
- #undef SUPPORT_SLOW_DATA_PORTS
- #define SUPPORT_SLOW_DATA_PORTS 0
- /* request and free a normal interrupt */
- #define ide_request_irq(irq,hand,flg,dev,id) request_irq((irq),(hand),(flg),(dev),(id))
- #define ide_free_irq(irq,dev_id) free_irq((irq), (dev_id))
- /* ide-probe.c calls ide_request_region and stuff on the io_ports defined,
- * but since they are not actually memory-mapped in the ETRAX driver, we don't
- * do anything.
- */
- #define ide_check_region(from,extent) (0)
- #define ide_request_region(from,extent,name) do {} while(0)
- #define ide_release_region(from,extent) do {} while(0)
- /*
- * The following are not needed for the non-m68k ports
- */
- #define ide_ack_intr(hwif) (1)
- #define ide_fix_driveid(id) do {} while (0)
- #define ide_release_lock(lock) do {} while (0)
- #define ide_get_lock(lock, hdlr, data) do {} while (0)
- /* the drive addressing is done through a controller register on the Etrax CPU */
- void OUT_BYTE(unsigned char data, ide_ioreg_t reg);
- unsigned char IN_BYTE(ide_ioreg_t reg);
- /* this tells ide.h not to define the standard macros */
- #define HAVE_ARCH_OUT_BYTE
- #define HAVE_ARCH_IN_BYTE
- #endif /* __KERNEL__ */
- #endif /* __ASMCRIS_IDE_H */