1 /*
2 * Architecture specific parts of the Floppy driver
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1995 - 2000 Ralf Baechle
9 */
10 #ifndef _ASM_FLOPPY_H
11 #define _ASM_FLOPPY_H
12
13 #include <asm/bootinfo.h>
14 #include <asm/jazz.h>
15 #include <asm/jazzdma.h>
16
17 struct fd_ops {
18 unsigned char (*fd_inb)(unsigned int port);
19 void (*fd_outb)(unsigned char value, unsigned int port);
20
21 /*
22 * How to access the floppy DMA functions.
23 */
24 void (*fd_enable_dma)(int channel);
25 void (*fd_disable_dma)(int channel);
26 int (*fd_request_dma)(int channel);
27 void (*fd_free_dma)(int channel);
28 void (*fd_clear_dma_ff)(int channel);
29 void (*fd_set_dma_mode)(int channel, char mode);
30 void (*fd_set_dma_addr)(int channel, unsigned int a);
31 void (*fd_set_dma_count)(int channel, unsigned int count);
32 int (*fd_get_dma_residue)(int channel);
33 void (*fd_enable_irq)(int irq);
34 void (*fd_disable_irq)(int irq);
35 unsigned long (*fd_getfdaddr1)(void);
36 unsigned long (*fd_dma_mem_alloc)(unsigned long size);
37 void (*fd_dma_mem_free)(unsigned long addr, unsigned long size);
38 unsigned long (*fd_drive_type)(unsigned long);
39 };
40
41 extern struct fd_ops *fd_ops;
42
43 #define fd_inb(port) fd_ops->fd_inb(port)
44 #define fd_outb(value,port) fd_ops->fd_outb(value,port)
45
46 #define fd_enable_dma() fd_ops->fd_enable_dma(FLOPPY_DMA)
47 #define fd_disable_dma() fd_ops->fd_disable_dma(FLOPPY_DMA)
48 #define fd_request_dma() fd_ops->fd_request_dma(FLOPPY_DMA)
49 #define fd_free_dma() fd_ops->fd_free_dma(FLOPPY_DMA)
50 #define fd_clear_dma_ff() fd_ops->fd_clear_dma_ff(FLOPPY_DMA)
51 #define fd_set_dma_mode(mode) fd_ops->fd_set_dma_mode(FLOPPY_DMA, mode)
52 #define fd_set_dma_addr(addr) fd_ops->fd_set_dma_addr(FLOPPY_DMA, \
53 virt_to_bus(addr))
54 #define fd_set_dma_count(count) fd_ops->fd_set_dma_count(FLOPPY_DMA,count)
55 #define fd_get_dma_residue() fd_ops->fd_get_dma_residue(FLOPPY_DMA)
56
57 #define fd_enable_irq() fd_ops->fd_enable_irq(FLOPPY_IRQ)
58 #define fd_disable_irq() fd_ops->fd_disable_irq(FLOPPY_IRQ)
59 #define fd_request_irq() request_irq(FLOPPY_IRQ, floppy_interrupt, \
60 SA_INTERRUPT | SA_SAMPLE_RANDOM, \
61 "floppy", NULL)
62 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL);
63 #define fd_dma_mem_alloc(size) fd_ops->fd_dma_mem_alloc(size)
64 #define fd_dma_mem_free(mem,size) fd_ops->fd_dma_mem_free(mem,size)
65 #define fd_drive_type(n) fd_ops->fd_drive_type(n)
66 #define fd_cacheflush(addr,size) dma_cache_wback_inv(addr,size)
67
68 #define MAX_BUFFER_SECTORS 24
69
70
71 /*
72 * And on Mips's the CMOS info fails also ...
73 *
74 * FIXME: This information should come from the ARC configuration tree
75 * or whereever a particular machine has stored this ...
76 */
77 #define FLOPPY0_TYPE fd_drive_type(0)
78 #define FLOPPY1_TYPE fd_drive_type(1)
79
80 #define FDC1 fd_ops->fd_getfdaddr1();
81
82 /*
83 * Hack: The floppy drivrer defines this, before including fdreg.h. We use
84 * to define FDC2 only one and keep it a static variable in floppy.c.
85 */
86 #ifdef FDPATCHES
87 static int FDC2 = -1;
88 #endif
89
90 #define N_FDC 1 /* do you *really* want a second controller? */
91 #define N_DRIVE 8
92
93 #define FLOPPY_MOTOR_MASK 0xf0
94
95 /*
96 * The DMA channel used by the floppy controller cannot access data at
97 * addresses >= 16MB
98 *
99 * Went back to the 1MB limit, as some people had problems with the floppy
100 * driver otherwise. It doesn't matter much for performance anyway, as most
101 * floppy accesses go through the track buffer.
102 *
103 * On MIPSes using vdma, this actually means that *all* transfers go thru
104 * the * track buffer since 0x1000000 is always smaller than KSEG0/1.
105 * Actually this needs to be a bit more complicated since the so much different
106 * hardware available with MIPS CPUs ...
107 */
108 #define CROSS_64KB(a,s) ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)
109
110 #endif /* _ASM_FLOPPY_H */
111
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