include/asm-cris/arch-v10/ide.h

   1 /*
   2  *  linux/include/asm-cris/ide.h
   3  *
   4  *  Copyright (C) 2000, 2001, 2002  Axis Communications AB
   5  *
   6  *  Authors:    Bjorn Wesen
   7  *
   8  */
   9
  10 /*
  11  *  This file contains the ETRAX 100LX specific IDE code.
  12  */
  13
  14 #ifndef __ASMCRIS_IDE_H
  15 #define __ASMCRIS_IDE_H
  16
  17 #ifdef __KERNEL__
  18
  19 #include <asm/arch/svinto.h>
  20 #include <asm/io.h>
  21 #include <asm-generic/ide_iops.h>
  22
  23
  24 /* ETRAX 100 can support 4 IDE busses on the same pins (serialized) */
  25
  26 #define MAX_HWIFS       4
  27
  28 static inline int ide_default_irq(unsigned long base)
  29 {
  30         /* all IDE busses share the same IRQ, number 4.
  31          * this has the side-effect that ide-probe.c will cluster our 4 interfaces
  32          * together in a hwgroup, and will serialize accesses. this is good, because
  33          * we can't access more than one interface at the same time on ETRAX100.
  34          */
  35         return 4;
  36 }
  37
  38 static inline unsigned long ide_default_io_base(int index)
  39 {
  40         /* we have no real I/O base address per interface, since all go through the
  41          * same register. but in a bitfield in that register, we have the i/f number.
  42          * so we can use the io_base to remember that bitfield.
  43          */
  44         static const unsigned long io_bases[MAX_HWIFS] = {
  45                 IO_FIELD(R_ATA_CTRL_DATA, sel, 0),
  46                 IO_FIELD(R_ATA_CTRL_DATA, sel, 1),
  47                 IO_FIELD(R_ATA_CTRL_DATA, sel, 2),
  48                 IO_FIELD(R_ATA_CTRL_DATA, sel, 3)
  49         };
  50         return io_bases[index];
  51 }
  52
  53 /* this is called once for each interface, to setup the port addresses. data_port is the result
  54  * of the ide_default_io_base call above. ctrl_port will be 0, but that is don't care for us.
  55  */
  56
  57 static inline void ide_init_hwif_ports(hw_regs_t *hw, unsigned long data_port, unsigned long ctrl_port, int *irq)
  58 {
  59         int i;
  60
  61         /* fill in ports for ATA addresses 0 to 7 */
  62
  63         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
  64                 hw->io_ports[i] = data_port |
  65                         IO_FIELD(R_ATA_CTRL_DATA, addr, i) |
  66                         IO_STATE(R_ATA_CTRL_DATA, cs0, active);
  67         }
  68
  69         /* the IDE control register is at ATA address 6, with CS1 active instead of CS0 */
  70
  71         hw->io_ports[IDE_CONTROL_OFFSET] = data_port |
  72                         IO_FIELD(R_ATA_CTRL_DATA, addr, 6) |
  73                         IO_STATE(R_ATA_CTRL_DATA, cs1, active);
  74
  75         /* whats this for ? */
  76
  77         hw->io_ports[IDE_IRQ_OFFSET] = 0;
  78 }
  79
  80 static inline void ide_init_default_hwifs(void)
  81 {
  82         hw_regs_t hw;
  83         int index;
  84
  85         for(index = 0; index < MAX_HWIFS; index++) {
  86                 ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, NULL);
  87                 hw.irq = ide_default_irq(ide_default_io_base(index));
  88                 ide_register_hw(&hw, NULL);
  89         }
  90 }
  91
  92 #endif /* __KERNEL__ */
  93
  94 #endif /* __ASMCRIS_IDE_H */