floppy.h revision b8b572e1015f81b4e748417be2629dfe51ab99f9 
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
9 */
10#ifndef __ASM_POWERPC_FLOPPY_H
11#define __ASM_POWERPC_FLOPPY_H
12#ifdef __KERNEL__
13
14#include <asm/machdep.h>
15
16#define fd_inb(port)		inb_p(port)
17#define fd_outb(value,port)	outb_p(value,port)
18
19#define fd_enable_dma()         enable_dma(FLOPPY_DMA)
20#define fd_disable_dma()	 fd_ops->_disable_dma(FLOPPY_DMA)
21#define fd_free_dma()           fd_ops->_free_dma(FLOPPY_DMA)
22#define fd_clear_dma_ff()       clear_dma_ff(FLOPPY_DMA)
23#define fd_set_dma_mode(mode)   set_dma_mode(FLOPPY_DMA, mode)
24#define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA, count)
25#define fd_get_dma_residue()    fd_ops->_get_dma_residue(FLOPPY_DMA)
26#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
27#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
28#define fd_cacheflush(addr,size) /* nothing */
29#define fd_free_irq()           free_irq(FLOPPY_IRQ, NULL);
30
31#include <linux/pci.h>
32#include <asm/ppc-pci.h>	/* for isa_bridge_pcidev */
33
34#define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
35
36static int fd_request_dma(void);
37
38struct fd_dma_ops {
39	void (*_disable_dma)(unsigned int dmanr);
40	void (*_free_dma)(unsigned int dmanr);
41	int (*_get_dma_residue)(unsigned int dummy);
42	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
43};
44
45static int virtual_dma_count;
46static int virtual_dma_residue;
47static char *virtual_dma_addr;
48static int virtual_dma_mode;
49static int doing_vdma;
50static struct fd_dma_ops *fd_ops;
51
52static irqreturn_t floppy_hardint(int irq, void *dev_id)
53{
54	unsigned char st;
55	int lcount;
56	char *lptr;
57
58	if (!doing_vdma)
59		return floppy_interrupt(irq, dev_id);
60
61
62	st = 1;
63	for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
64	     lcount; lcount--, lptr++) {
65		st=inb(virtual_dma_port+4) & 0xa0 ;
66		if (st != 0xa0)
67			break;
68		if (virtual_dma_mode)
69			outb_p(*lptr, virtual_dma_port+5);
70		else
71			*lptr = inb_p(virtual_dma_port+5);
72	}
73	virtual_dma_count = lcount;
74	virtual_dma_addr = lptr;
75	st = inb(virtual_dma_port+4);
76
77	if (st == 0x20)
78		return IRQ_HANDLED;
79	if (!(st & 0x20)) {
80		virtual_dma_residue += virtual_dma_count;
81		virtual_dma_count=0;
82		doing_vdma = 0;
83		floppy_interrupt(irq, dev_id);
84		return IRQ_HANDLED;
85	}
86	return IRQ_HANDLED;
87}
88
89static void vdma_disable_dma(unsigned int dummy)
90{
91	doing_vdma = 0;
92	virtual_dma_residue += virtual_dma_count;
93	virtual_dma_count=0;
94}
95
96static void vdma_nop(unsigned int dummy)
97{
98}
99
100
101static int vdma_get_dma_residue(unsigned int dummy)
102{
103	return virtual_dma_count + virtual_dma_residue;
104}
105
106
107static int fd_request_irq(void)
108{
109	if (can_use_virtual_dma)
110		return request_irq(FLOPPY_IRQ, floppy_hardint,
111				   IRQF_DISABLED, "floppy", NULL);
112	else
113		return request_irq(FLOPPY_IRQ, floppy_interrupt,
114				   IRQF_DISABLED, "floppy", NULL);
115}
116
117static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
118{
119	doing_vdma = 1;
120	virtual_dma_port = io;
121	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
122	virtual_dma_addr = addr;
123	virtual_dma_count = size;
124	virtual_dma_residue = 0;
125	return 0;
126}
127
128static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
129{
130	static unsigned long prev_size;
131	static dma_addr_t bus_addr = 0;
132	static char *prev_addr;
133	static int prev_dir;
134	int dir;
135
136	doing_vdma = 0;
137	dir = (mode == DMA_MODE_READ) ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE;
138
139	if (bus_addr
140	    && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
141		/* different from last time -- unmap prev */
142		pci_unmap_single(isa_bridge_pcidev, bus_addr, prev_size, prev_dir);
143		bus_addr = 0;
144	}
145
146	if (!bus_addr)	/* need to map it */
147		bus_addr = pci_map_single(isa_bridge_pcidev, addr, size, dir);
148
149	/* remember this one as prev */
150	prev_addr = addr;
151	prev_size = size;
152	prev_dir = dir;
153
154	fd_clear_dma_ff();
155	fd_cacheflush(addr, size);
156	fd_set_dma_mode(mode);
157	set_dma_addr(FLOPPY_DMA, bus_addr);
158	fd_set_dma_count(size);
159	virtual_dma_port = io;
160	fd_enable_dma();
161
162	return 0;
163}
164
165static struct fd_dma_ops real_dma_ops =
166{
167	._disable_dma = disable_dma,
168	._free_dma = free_dma,
169	._get_dma_residue = get_dma_residue,
170	._dma_setup = hard_dma_setup
171};
172
173static struct fd_dma_ops virt_dma_ops =
174{
175	._disable_dma = vdma_disable_dma,
176	._free_dma = vdma_nop,
177	._get_dma_residue = vdma_get_dma_residue,
178	._dma_setup = vdma_dma_setup
179};
180
181static int fd_request_dma(void)
182{
183	if (can_use_virtual_dma & 1) {
184		fd_ops = &virt_dma_ops;
185		return 0;
186	}
187	else {
188		fd_ops = &real_dma_ops;
189		return request_dma(FLOPPY_DMA, "floppy");
190	}
191}
192
193static int FDC1 = 0x3f0;
194static int FDC2 = -1;
195
196/*
197 * Again, the CMOS information not available
198 */
199#define FLOPPY0_TYPE 6
200#define FLOPPY1_TYPE 0
201
202#define N_FDC 2			/* Don't change this! */
203#define N_DRIVE 8
204
205/*
206 * The PowerPC has no problems with floppy DMA crossing 64k borders.
207 */
208#define CROSS_64KB(a,s)	(0)
209
210#define EXTRA_FLOPPY_PARAMS
211
212#endif /* __KERNEL__ */
213#endif /* __ASM_POWERPC_FLOPPY_H */
214