drivers/ide/ide-h8300.c

   1 /*
   2  * H8/300 generic IDE interface
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/ide.h>
   7
   8 #include <asm/io.h>
   9 #include <asm/irq.h>
  10
  11 #define DRV_NAME "ide-h8300"
  12
  13 #define bswap(d) \
  14 ({                                      \
  15         u16 r;                          \
  16         __asm__("mov.b %w1,r1h\n\t"     \
  17                 "mov.b %x1,r1l\n\t"     \
  18                 "mov.w r1,%0"           \
  19                 :"=r"(r)                \
  20                 :"r"(d)                 \
  21                 :"er1");                \
  22         (r);                            \
  23 })
  24
  25 static void mm_outsw(unsigned long addr, void *buf, u32 len)
  26 {
  27         unsigned short *bp = (unsigned short *)buf;
  28         for (; len > 0; len--, bp++)
  29                 *(volatile u16 *)addr = bswap(*bp);
  30 }
  31
  32 static void mm_insw(unsigned long addr, void *buf, u32 len)
  33 {
  34         unsigned short *bp = (unsigned short *)buf;
  35         for (; len > 0; len--, bp++)
  36                 *bp = bswap(*(volatile u16 *)addr);
  37 }
  38
  39 static void h8300_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
  40                              void *buf, unsigned int len)
  41 {
  42         mm_insw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
  43 }
  44
  45 static void h8300_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
  46                               void *buf, unsigned int len)
  47 {
  48         mm_outsw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
  49 }
  50
  51 static const struct ide_tp_ops h8300_tp_ops = {
  52         .exec_command           = ide_exec_command,
  53         .read_status            = ide_read_status,
  54         .read_altstatus         = ide_read_altstatus,
  55         .write_devctl           = ide_write_devctl,
  56
  57         .dev_select             = ide_dev_select,
  58         .tf_load                = ide_tf_load,
  59         .tf_read                = ide_tf_read,
  60
  61         .input_data             = h8300_input_data,
  62         .output_data            = h8300_output_data,
  63 };
  64
  65 #define H8300_IDE_GAP (2)
  66
  67 static inline void hw_setup(hw_regs_t *hw)
  68 {
  69         int i;
  70
  71         memset(hw, 0, sizeof(hw_regs_t));
  72         for (i = 0; i <= 7; i++)
  73                 hw->io_ports_array[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
  74         hw->io_ports.ctl_addr = CONFIG_H8300_IDE_ALT;
  75         hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
  76         hw->chipset = ide_generic;
  77 }
  78
  79 static const struct ide_port_info h8300_port_info = {
  80         .tp_ops                 = &h8300_tp_ops,
  81         .host_flags             = IDE_HFLAG_NO_IO_32BIT | IDE_HFLAG_NO_DMA,
  82 };
  83
  84 static int __init h8300_ide_init(void)
  85 {
  86         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
  87
  88         printk(KERN_INFO DRV_NAME ": H8/300 generic IDE interface\n");
  89
  90         if (!request_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8, "ide-h8300"))
  91                 goto out_busy;
  92         if (!request_region(CONFIG_H8300_IDE_ALT, H8300_IDE_GAP, "ide-h8300")) {
  93                 release_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8);
  94                 goto out_busy;
  95         }
  96
  97         hw_setup(&hw);
  98
  99         return ide_host_add(&h8300_port_info, hws, NULL);
 100
 101 out_busy:
 102         printk(KERN_ERR "ide-h8300: IDE I/F resource already used.\n");
 103
 104         return -EBUSY;
 105 }
 106
 107 module_init(h8300_ide_init);
 108
 109 MODULE_LICENSE("GPL");