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/*
* linux/include/asm-cris/ide.h
*
* Copyright (C) 2000, 2001, 2002 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/arch/svinto.h>
#include <asm/io.h>
#include <asm-generic/ide_iops.h>
/* ETRAX 100 can support 4 IDE busses on the same pins (serialized) */
#define MAX_HWIFS 4
static inline int ide_default_irq(unsigned long 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 unsigned long 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, unsigned long data_port, unsigned long 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);
}
}
#endif /* __KERNEL__ */
#endif /* __ASMCRIS_IDE_H */
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