drivers/ide/h8300/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 bswap(d) \
  12 ({                                      \
  13         u16 r;                          \
  14         __asm__("mov.b %w1,r1h\n\t"     \
  15                 "mov.b %x1,r1l\n\t"     \
  16                 "mov.w r1,%0"           \
  17                 :"=r"(r)                \
  18                 :"r"(d)                 \
  19                 :"er1");                \
  20         (r);                            \
  21 })
  22
  23 static void mm_outw(u16 d, unsigned long a)
  24 {
  25         __asm__("mov.b %w0,r2h\n\t"
  26                 "mov.b %x0,r2l\n\t"
  27                 "mov.w r2,@%1"
  28                 :
  29                 :"r"(d),"r"(a)
  30                 :"er2");
  31 }
  32
  33 static u16 mm_inw(unsigned long a)
  34 {
  35         register u16 r __asm__("er0");
  36         __asm__("mov.w @%1,r2\n\t"
  37                 "mov.b r2l,%x0\n\t"
  38                 "mov.b r2h,%w0"
  39                 :"=r"(r)
  40                 :"r"(a)
  41                 :"er2");
  42         return r;
  43 }
  44
  45 static void mm_outsw(unsigned long addr, void *buf, u32 len)
  46 {
  47         unsigned short *bp = (unsigned short *)buf;
  48         for (; len > 0; len--, bp++)
  49                 *(volatile u16 *)addr = bswap(*bp);
  50 }
  51
  52 static void mm_insw(unsigned long addr, void *buf, u32 len)
  53 {
  54         unsigned short *bp = (unsigned short *)buf;
  55         for (; len > 0; len--, bp++)
  56                 *bp = bswap(*(volatile u16 *)addr);
  57 }
  58
  59 #define H8300_IDE_GAP (2)
  60
  61 static inline void hw_setup(hw_regs_t *hw)
  62 {
  63         int i;
  64
  65         memset(hw, 0, sizeof(hw_regs_t));
  66         for (i = 0; i <= IDE_STATUS_OFFSET; i++)
  67                 hw->io_ports[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
  68         hw->io_ports[IDE_CONTROL_OFFSET] = CONFIG_H8300_IDE_ALT;
  69         hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
  70         hw->chipset = ide_generic;
  71 }
  72
  73 static inline void hwif_setup(ide_hwif_t *hwif)
  74 {
  75         default_hwif_iops(hwif);
  76
  77         hwif->mmio  = 1;
  78         hwif->OUTW  = mm_outw;
  79         hwif->OUTSW = mm_outsw;
  80         hwif->INW   = mm_inw;
  81         hwif->INSW  = mm_insw;
  82         hwif->OUTSL = NULL;
  83         hwif->INSL  = NULL;
  84 }
  85
  86 static int __init h8300_ide_init(void)
  87 {
  88         hw_regs_t hw;
  89         ide_hwif_t *hwif;
  90         int index;
  91         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
  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         hwif = ide_find_port(hw.io_ports[IDE_DATA_OFFSET]);
 104         if (hwif == NULL) {
 105                 printk(KERN_ERR "ide-h8300: IDE I/F register failed\n");
 106                 return -ENOENT;
 107         }
 108
 109         index = hwif->index;
 110         ide_init_port_data(hwif, index);
 111         ide_init_port_hw(hwif, &hw);
 112         hwif_setup(hwif);
 113         printk(KERN_INFO "ide%d: H8/300 generic IDE interface\n", index);
 114
 115         idx[0] = index;
 116
 117         ide_device_add(idx, NULL);
 118
 119         return 0;
 120
 121 out_busy:
 122         printk(KERN_ERR "ide-h8300: IDE I/F resource already used.\n");
 123
 124         return -EBUSY;
 125 }
 126
 127 module_init(h8300_ide_init);