drivers/ide/h8300/ide-h8300.c

   1 /*
   2  * drivers/ide/ide-h8300.c
   3  * H8/300 generic IDE interface
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/ide.h>
   8 #include <linux/config.h>
   9
  10 #include <asm/io.h>
  11 #include <asm/irq.h>
  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_outw(u16 d, unsigned long a)
  26 {
  27         __asm__("mov.b %w0,r2h\n\t"
  28                 "mov.b %x0,r2l\n\t"
  29                 "mov.w r2,@%1"
  30                 :
  31                 :"r"(d),"r"(a)
  32                 :"er2");
  33 }
  34
  35 static u16 mm_inw(unsigned long a)
  36 {
  37         register u16 r __asm__("er0");
  38         __asm__("mov.w @%1,r2\n\t"
  39                 "mov.b r2l,%x0\n\t"
  40                 "mov.b r2h,%w0"
  41                 :"=r"(r)
  42                 :"r"(a)
  43                 :"er2");
  44         return r;
  45 }
  46
  47 static void mm_outsw(unsigned long addr, void *buf, u32 len)
  48 {
  49         unsigned short *bp = (unsigned short *)buf;
  50         for (; len > 0; len--, bp++)
  51                 *(volatile u16 *)addr = bswap(*bp);
  52 }
  53
  54 static void mm_insw(unsigned long addr, void *buf, u32 len)
  55 {
  56         unsigned short *bp = (unsigned short *)buf;
  57         for (; len > 0; len--, bp++)
  58                 *bp = bswap(*(volatile u16 *)addr);
  59 }
  60
  61 #define H8300_IDE_GAP (2)
  62
  63 static inline void hw_setup(hw_regs_t *hw)
  64 {
  65         int i;
  66
  67         memset(hw, 0, sizeof(hw_regs_t));
  68         for (i = 0; i <= IDE_STATUS_OFFSET; i++)
  69                 hw->io_ports[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
  70         hw->io_ports[IDE_CONTROL_OFFSET] = CONFIG_H8300_IDE_ALT;
  71         hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
  72         hw->dma = NO_DMA;
  73         hw->chipset = ide_generic;
  74 }
  75
  76 static inline void hwif_setup(ide_hwif_t *hwif)
  77 {
  78         default_hwif_iops(hwif);
  79
  80         hwif->mmio  = 2;
  81         hwif->OUTW  = mm_outw;
  82         hwif->OUTSW = mm_outsw;
  83         hwif->INW   = mm_inw;
  84         hwif->INSW  = mm_insw;
  85         hwif->OUTL  = NULL;
  86         hwif->INL   = NULL;
  87         hwif->OUTSL = NULL;
  88         hwif->INSL  = NULL;
  89 }
  90
  91 void __init h8300_ide_init(void)
  92 {
  93         hw_regs_t hw;
  94         ide_hwif_t *hwif;
  95         int idx;
  96
  97         if (!request_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8, "ide-h8300"))
  98                 goto out_busy;
  99         if (!request_region(CONFIG_H8300_IDE_ALT, H8300_IDE_GAP, "ide-h8300")) {
 100                 release_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8);
 101                 goto out_busy;
 102         }
 103
 104         hw_setup(&hw);
 105
 106         /* register if */
 107         idx = ide_register_hw(&hw, &hwif);
 108         if (idx == -1) {
 109                 printk(KERN_ERR "ide-h8300: IDE I/F register failed\n");
 110                 return;
 111         }
 112
 113         hwif_setup(hwif);
 114         printk(KERN_INFO "ide%d: H8/300 generic IDE interface\n", idx);
 115         return;
 116
 117 out_busy:
 118         printk(KERN_ERR "ide-h8300: IDE I/F resource already used.\n");
 119 }