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ide-h8300.c
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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(struct ide_hw *hw)
68 {
69  int i;
70 
71  memset(hw, 0, sizeof(*hw));
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 }
77 
78 static const struct ide_port_info h8300_port_info = {
79  .tp_ops = &h8300_tp_ops,
81  .chipset = ide_generic,
82 };
83 
84 static int __init h8300_ide_init(void)
85 {
86  struct ide_hw hw, *hws[] = { &hw };
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, 1, 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");