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(base, reg)		inb_p((base) + (reg))
17#define fd_outb(value, base, reg)	outb_p(value, (base) + (reg))
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_free_irq()           free_irq(FLOPPY_IRQ, NULL);
29
30#include <linux/pci.h>
31#include <asm/ppc-pci.h>	/* for isa_bridge_pcidev */
32
33#define fd_dma_setup(addr,size,mode,io) fd_ops->_dma_setup(addr,size,mode,io)
34
35static int fd_request_dma(void);
36
37struct fd_dma_ops {
38	void (*_disable_dma)(unsigned int dmanr);
39	void (*_free_dma)(unsigned int dmanr);
40	int (*_get_dma_residue)(unsigned int dummy);
41	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
42};
43
44static int virtual_dma_count;
45static int virtual_dma_residue;
46static char *virtual_dma_addr;
47static int virtual_dma_mode;
48static int doing_vdma;
49static struct fd_dma_ops *fd_ops;
50
51static irqreturn_t floppy_hardint(int irq, void *dev_id)
52{
53	unsigned char st;
54	int lcount;
55	char *lptr;
56
57	if (!doing_vdma)
58		return floppy_interrupt(irq, dev_id);
59
60
61	st = 1;
62	for (lcount=virtual_dma_count, lptr=virtual_dma_addr;
63	     lcount; lcount--, lptr++) {
64		st = inb(virtual_dma_port + FD_STATUS);
65		st &= STATUS_DMA | STATUS_READY;
66		if (st != (STATUS_DMA | STATUS_READY))
67			break;
68		if (virtual_dma_mode)
69			outb_p(*lptr, virtual_dma_port + FD_DATA);
70		else
71			*lptr = inb_p(virtual_dma_port + FD_DATA);
72	}
73	virtual_dma_count = lcount;
74	virtual_dma_addr = lptr;
75	st = inb(virtual_dma_port + FD_STATUS);
76
77	if (st == STATUS_DMA)
78		return IRQ_HANDLED;
79	if (!(st & STATUS_DMA)) {
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				   0, "floppy", NULL);
112	else
113		return request_irq(FLOPPY_IRQ, floppy_interrupt,
114				   0, "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) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
138
139	if (bus_addr
140	    && (addr != prev_addr || size != prev_size || dir != prev_dir)) {
141		/* different from last time -- unmap prev */
142		dma_unmap_single(&isa_bridge_pcidev->dev, bus_addr, prev_size,
143				 prev_dir);
144		bus_addr = 0;
145	}
146
147	if (!bus_addr)	/* need to map it */
148		bus_addr = dma_map_single(&isa_bridge_pcidev->dev, addr, size,
149					  dir);
150
151	/* remember this one as prev */
152	prev_addr = addr;
153	prev_size = size;
154	prev_dir = dir;
155
156	fd_clear_dma_ff();
157	fd_set_dma_mode(mode);
158	set_dma_addr(FLOPPY_DMA, bus_addr);
159	fd_set_dma_count(size);
160	virtual_dma_port = io;
161	fd_enable_dma();
162
163	return 0;
164}
165
166static struct fd_dma_ops real_dma_ops =
167{
168	._disable_dma = disable_dma,
169	._free_dma = free_dma,
170	._get_dma_residue = get_dma_residue,
171	._dma_setup = hard_dma_setup
172};
173
174static struct fd_dma_ops virt_dma_ops =
175{
176	._disable_dma = vdma_disable_dma,
177	._free_dma = vdma_nop,
178	._get_dma_residue = vdma_get_dma_residue,
179	._dma_setup = vdma_dma_setup
180};
181
182static int fd_request_dma(void)
183{
184	if (can_use_virtual_dma & 1) {
185		fd_ops = &virt_dma_ops;
186		return 0;
187	}
188	else {
189		fd_ops = &real_dma_ops;
190		return request_dma(FLOPPY_DMA, "floppy");
191	}
192}
193
194static int FDC1 = 0x3f0;
195static int FDC2 = -1;
196
197/*
198 * Again, the CMOS information not available
199 */
200#define FLOPPY0_TYPE 6
201#define FLOPPY1_TYPE 0
202
203#define N_FDC 2			/* Don't change this! */
204#define N_DRIVE 8
205
206/*
207 * The PowerPC has no problems with floppy DMA crossing 64k borders.
208 */
209#define CROSS_64KB(a,s)	(0)
210
211#define EXTRA_FLOPPY_PARAMS
212
213#endif /* __KERNEL__ */
214#endif /* __ASM_POWERPC_FLOPPY_H */
215