drivers/ide/h8300/ide-h8300.c

   1 /*
   2  * drivers/ide/h8300/ide-h8300.c
   3  * H8/300 generic IDE interface
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/ide.h>
   8
   9 #include <asm/io.h>
  10 #include <asm/irq.h>
  11
  12 #define bswap(d) \
  13 ({                                      \
  14         u16 r;                          \
  15         __asm__("mov.b %w1,r1h\n\t"     \
  16                 "mov.b %x1,r1l\n\t"     \
  17                 "mov.w r1,%0"           \
  18                 :"=r"(r)                \
  19                 :"r"(d)                 \
  20                 :"er1");                \
  21         (r);                            \
  22 })
  23
  24 static void mm_outw(u16 d, unsigned long a)
  25 {
  26         __asm__("mov.b %w0,r2h\n\t"
  27                 "mov.b %x0,r2l\n\t"
  28                 "mov.w r2,@%1"
  29                 :
  30                 :"r"(d),"r"(a)
  31                 :"er2");
  32 }
  33
  34 static u16 mm_inw(unsigned long a)
  35 {
  36         register u16 r __asm__("er0");
  37         __asm__("mov.w @%1,r2\n\t"
  38                 "mov.b r2l,%x0\n\t"
  39                 "mov.b r2h,%w0"
  40                 :"=r"(r)
  41                 :"r"(a)
  42                 :"er2");
  43         return r;
  44 }
  45
  46 static void mm_outsw(unsigned long addr, void *buf, u32 len)
  47 {
  48         unsigned short *bp = (unsigned short *)buf;
  49         for (; len > 0; len--, bp++)
  50                 *(volatile u16 *)addr = bswap(*bp);
  51 }
  52
  53 static void mm_insw(unsigned long addr, void *buf, u32 len)
  54 {
  55         unsigned short *bp = (unsigned short *)buf;
  56         for (; len > 0; len--, bp++)
  57                 *bp = bswap(*(volatile u16 *)addr);
  58 }
  59
  60 #define H8300_IDE_GAP (2)
  61
  62 static inline void hw_setup(hw_regs_t *hw)
  63 {
  64         int i;
  65
  66         memset(hw, 0, sizeof(hw_regs_t));
  67         for (i = 0; i <= IDE_STATUS_OFFSET; i++)
  68                 hw->io_ports[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
  69         hw->io_ports[IDE_CONTROL_OFFSET] = CONFIG_H8300_IDE_ALT;
  70         hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
  71         hw->chipset = ide_generic;
  72 }
  73
  74 static inline void hwif_setup(ide_hwif_t *hwif)
  75 {
  76         default_hwif_iops(hwif);
  77
  78         hwif->mmio  = 1;
  79         hwif->OUTW  = mm_outw;
  80         hwif->OUTSW = mm_outsw;
  81         hwif->INW   = mm_inw;
  82         hwif->INSW  = mm_insw;
  83         hwif->OUTSL = NULL;
  84         hwif->INSL  = NULL;
  85 }
  86
  87 void __init h8300_ide_init(void)
  88 {
  89         hw_regs_t hw;
  90         ide_hwif_t *hwif;
  91         int idx;
  92
  93         if (!request_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8, "ide-h8300"))
  94                 goto out_busy;
  95         if (!request_region(CONFIG_H8300_IDE_ALT, H8300_IDE_GAP, "ide-h8300")) {
  96                 release_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8);
  97                 goto out_busy;
  98         }
  99
 100         hw_setup(&hw);
 101
 102         /* register if */
 103         idx = ide_register_hw(&hw, NULL, 1, &hwif);
 104         if (idx == -1) {
 105                 printk(KERN_ERR "ide-h8300: IDE I/F register failed\n");
 106                 return;
 107         }
 108
 109         hwif_setup(hwif);
 110         printk(KERN_INFO "ide%d: H8/300 generic IDE interface\n", idx);
 111         return;
 112
 113 out_busy:
 114         printk(KERN_ERR "ide-h8300: IDE I/F resource already used.\n");
 115 }