8250.c: less than 2400 baud fix.
[linux-2.6.git] / 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(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,
80         .host_flags             = IDE_HFLAG_NO_IO_32BIT | IDE_HFLAG_NO_DMA,
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");