floppy.h

  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		if (dma_mapping_error(&isa_bridge_pcidev->dev, bus_addr))
151			return -ENOMEM;
152	}
153
154	/* remember this one as prev */
155	prev_addr = addr;
156	prev_size = size;
157	prev_dir = dir;
158
159	fd_clear_dma_ff();
160	fd_set_dma_mode(mode);
161	set_dma_addr(FLOPPY_DMA, bus_addr);
162	fd_set_dma_count(size);
163	virtual_dma_port = io;
164	fd_enable_dma();
165
166	return 0;
167}
168
169static struct fd_dma_ops real_dma_ops =
170{
171	._disable_dma = disable_dma,
172	._free_dma = free_dma,
173	._get_dma_residue = get_dma_residue,
174	._dma_setup = hard_dma_setup
175};
176
177static struct fd_dma_ops virt_dma_ops =
178{
179	._disable_dma = vdma_disable_dma,
180	._free_dma = vdma_nop,
181	._get_dma_residue = vdma_get_dma_residue,
182	._dma_setup = vdma_dma_setup
183};
184
185static int fd_request_dma(void)
186{
187	if (can_use_virtual_dma & 1) {
188		fd_ops = &virt_dma_ops;
189		return 0;
190	}
191	else {
192		fd_ops = &real_dma_ops;
193		return request_dma(FLOPPY_DMA, "floppy");
194	}
195}
196
197static int FDC1 = 0x3f0;
198static int FDC2 = -1;
199
200/*
201 * Again, the CMOS information not available
202 */
203#define FLOPPY0_TYPE 6
204#define FLOPPY1_TYPE 0
205
206#define N_FDC 2			/* Don't change this! */
207#define N_DRIVE 8
208
209#define EXTRA_FLOPPY_PARAMS
210
211#endif /* __KERNEL__ */
212#endif /* __ASM_POWERPC_FLOPPY_H */