xref: /openbmc/linux/arch/arm/include/asm/floppy.h (revision 31b90347)
1 /*
2  *  arch/arm/include/asm/floppy.h
3  *
4  *  Copyright (C) 1996-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  *  Note that we don't touch FLOPPY_DMA nor FLOPPY_IRQ here
11  */
12 #ifndef __ASM_ARM_FLOPPY_H
13 #define __ASM_ARM_FLOPPY_H
14 #if 0
15 #include <mach/floppy.h>
16 #endif
17 
18 #define fd_outb(val,port)			\
19 	do {					\
20 		if ((port) == FD_DOR)		\
21 			fd_setdor((val));	\
22 		else				\
23 			outb((val),(port));	\
24 	} while(0)
25 
26 #define fd_inb(port)		inb((port))
27 #define fd_request_irq()	request_irq(IRQ_FLOPPYDISK,floppy_interrupt,\
28 					    IRQF_DISABLED,"floppy",NULL)
29 #define fd_free_irq()		free_irq(IRQ_FLOPPYDISK,NULL)
30 #define fd_disable_irq()	disable_irq(IRQ_FLOPPYDISK)
31 #define fd_enable_irq()		enable_irq(IRQ_FLOPPYDISK)
32 
33 static inline int fd_dma_setup(void *data, unsigned int length,
34 			       unsigned int mode, unsigned long addr)
35 {
36 	set_dma_mode(DMA_FLOPPY, mode);
37 	__set_dma_addr(DMA_FLOPPY, data);
38 	set_dma_count(DMA_FLOPPY, length);
39 	virtual_dma_port = addr;
40 	enable_dma(DMA_FLOPPY);
41 	return 0;
42 }
43 #define fd_dma_setup		fd_dma_setup
44 
45 #define fd_request_dma()	request_dma(DMA_FLOPPY,"floppy")
46 #define fd_free_dma()		free_dma(DMA_FLOPPY)
47 #define fd_disable_dma()	disable_dma(DMA_FLOPPY)
48 
49 /* need to clean up dma.h */
50 #define DMA_FLOPPYDISK		DMA_FLOPPY
51 
52 /* Floppy_selects is the list of DOR's to select drive fd
53  *
54  * On initialisation, the floppy list is scanned, and the drives allocated
55  * in the order that they are found.  This is done by seeking the drive
56  * to a non-zero track, and then restoring it to track 0.  If an error occurs,
57  * then there is no floppy drive present.       [to be put back in again]
58  */
59 static unsigned char floppy_selects[2][4] =
60 {
61 	{ 0x10, 0x21, 0x23, 0x33 },
62 	{ 0x10, 0x21, 0x23, 0x33 }
63 };
64 
65 #define fd_setdor(dor)								\
66 do {										\
67 	int new_dor = (dor);							\
68 	if (new_dor & 0xf0)							\
69 		new_dor = (new_dor & 0x0c) | floppy_selects[fdc][new_dor & 3];	\
70 	else									\
71 		new_dor &= 0x0c;						\
72 	outb(new_dor, FD_DOR);							\
73 } while (0)
74 
75 /*
76  * Someday, we'll automatically detect which drives are present...
77  */
78 static inline void fd_scandrives (void)
79 {
80 #if 0
81 	int floppy, drive_count;
82 
83 	fd_disable_irq();
84 	raw_cmd = &default_raw_cmd;
85 	raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_SEEK;
86 	raw_cmd->track = 0;
87 	raw_cmd->rate = ?;
88 	drive_count = 0;
89 	for (floppy = 0; floppy < 4; floppy ++) {
90 		current_drive = drive_count;
91 		/*
92 		 * Turn on floppy motor
93 		 */
94 		if (start_motor(redo_fd_request))
95 			continue;
96 		/*
97 		 * Set up FDC
98 		 */
99 		fdc_specify();
100 		/*
101 		 * Tell FDC to recalibrate
102 		 */
103 		output_byte(FD_RECALIBRATE);
104 		LAST_OUT(UNIT(floppy));
105 		/* wait for command to complete */
106 		if (!successful) {
107 			int i;
108 			for (i = drive_count; i < 3; i--)
109 				floppy_selects[fdc][i] = floppy_selects[fdc][i + 1];
110 			floppy_selects[fdc][3] = 0;
111 			floppy -= 1;
112 		} else
113 			drive_count++;
114 	}
115 #else
116 	floppy_selects[0][0] = 0x10;
117 	floppy_selects[0][1] = 0x21;
118 	floppy_selects[0][2] = 0x23;
119 	floppy_selects[0][3] = 0x33;
120 #endif
121 }
122 
123 #define FDC1 (0x3f0)
124 
125 #define FLOPPY0_TYPE 4
126 #define FLOPPY1_TYPE 4
127 
128 #define N_FDC 1
129 #define N_DRIVE 4
130 
131 #define CROSS_64KB(a,s) (0)
132 
133 /*
134  * This allows people to reverse the order of
135  * fd0 and fd1, in case their hardware is
136  * strangely connected (as some RiscPCs
137  * and A5000s seem to be).
138  */
139 static void driveswap(int *ints, int dummy, int dummy2)
140 {
141 	floppy_selects[0][0] ^= floppy_selects[0][1];
142 	floppy_selects[0][1] ^= floppy_selects[0][0];
143 	floppy_selects[0][0] ^= floppy_selects[0][1];
144 }
145 
146 #define EXTRA_FLOPPY_PARAMS ,{ "driveswap", &driveswap, NULL, 0, 0 }
147 
148 #endif
149