floppy.h

  1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/*    Architecture specific parts of the Floppy driver
  3 *
  4 *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
  5 *    Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
  6 *    Copyright (C) 2000 Dave Kennedy
  7 */
  8#ifndef __ASM_PARISC_FLOPPY_H
  9#define __ASM_PARISC_FLOPPY_H
 10
 11#include <linux/sizes.h>
 12#include <linux/vmalloc.h>
 13
 14/*
 15 * The DMA channel used by the floppy controller cannot access data at
 16 * addresses >= 16MB
 17 *
 18 * Went back to the 1MB limit, as some people had problems with the floppy
 19 * driver otherwise. It doesn't matter much for performance anyway, as most
 20 * floppy accesses go through the track buffer.
 21 */
 22#define _CROSS_64KB(a,s,vdma) \
 23	(!(vdma) && \
 24	 ((unsigned long)(a) / SZ_64K != ((unsigned long)(a) + (s) - 1) / SZ_64K))
 25
 26#define SW fd_routine[use_virtual_dma&1]
 27#define CSW fd_routine[can_use_virtual_dma & 1]
 28
 29#define fd_inb(base, reg)		readb((base) + (reg))
 30#define fd_outb(value, base, reg)	writeb(value, (base) + (reg))
 31
 32#define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
 33#define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
 34#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
 35#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
 36#define fd_free_irq()		free_irq(FLOPPY_IRQ, NULL)
 37#define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
 38#define fd_dma_mem_alloc(size)	SW._dma_mem_alloc(size)
 39#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
 40
 41#define FLOPPY_CAN_FALLBACK_ON_NODMA
 42
 43static int virtual_dma_count=0;
 44static int virtual_dma_residue=0;
 45static char *virtual_dma_addr=0;
 46static int virtual_dma_mode=0;
 47static int doing_pdma=0;
 48
 49static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
 50{
 51	register unsigned char st;
 52
 53#undef TRACE_FLPY_INT
 54
 55#ifdef TRACE_FLPY_INT
 56	static int calls=0;
 57	static int bytes=0;
 58	static int dma_wait=0;
 59#endif
 60	if (!doing_pdma) {
 61		floppy_interrupt(irq, dev_id, regs);
 62		return;
 63	}
 64
 65#ifdef TRACE_FLPY_INT
 66	if(!calls)
 67		bytes = virtual_dma_count;
 68#endif
 69
 70	{
 71		register int lcount;
 72		register char *lptr = virtual_dma_addr;
 73
 74		for (lcount = virtual_dma_count; lcount; lcount--) {
 75			st = fd_inb(virtual_dma_port, FD_STATUS);
 76			st &= STATUS_DMA | STATUS_READY;
 77			if (st != (STATUS_DMA | STATUS_READY))
 78				break;
 79			if (virtual_dma_mode) {
 80				fd_outb(*lptr, virtual_dma_port, FD_DATA);
 81			} else {
 82				*lptr = fd_inb(virtual_dma_port, FD_DATA);
 83			}
 84			lptr++;
 85		}
 86		virtual_dma_count = lcount;
 87		virtual_dma_addr = lptr;
 88		st = fd_inb(virtual_dma_port, FD_STATUS);
 89	}
 90
 91#ifdef TRACE_FLPY_INT
 92	calls++;
 93#endif
 94	if (st == STATUS_DMA)
 95		return;
 96	if (!(st & STATUS_DMA)) {
 97		virtual_dma_residue += virtual_dma_count;
 98		virtual_dma_count = 0;
 99#ifdef TRACE_FLPY_INT
100		printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 
101		       virtual_dma_count, virtual_dma_residue, calls, bytes,
102		       dma_wait);
103		calls = 0;
104		dma_wait=0;
105#endif
106		doing_pdma = 0;
107		floppy_interrupt(irq, dev_id, regs);
108		return;
109	}
110#ifdef TRACE_FLPY_INT
111	if (!virtual_dma_count)
112		dma_wait++;
113#endif
114}
115
116static void fd_disable_dma(void)
117{
118	if(! (can_use_virtual_dma & 1))
119		disable_dma(FLOPPY_DMA);
120	doing_pdma = 0;
121	virtual_dma_residue += virtual_dma_count;
122	virtual_dma_count=0;
123}
124
125static int vdma_request_dma(unsigned int dmanr, const char * device_id)
126{
127	return 0;
128}
129
130static void vdma_nop(unsigned int dummy)
131{
132}
133
134
135static int vdma_get_dma_residue(unsigned int dummy)
136{
137	return virtual_dma_count + virtual_dma_residue;
138}
139
140
141static int fd_request_irq(void)
142{
143	if(can_use_virtual_dma)
144		return request_irq(FLOPPY_IRQ, floppy_hardint,
145				   0, "floppy", NULL);
146	else
147		return request_irq(FLOPPY_IRQ, floppy_interrupt,
148				   0, "floppy", NULL);
149}
150
151static unsigned long dma_mem_alloc(unsigned long size)
152{
153	return __get_dma_pages(GFP_KERNEL, get_order(size));
154}
155
156
157static unsigned long vdma_mem_alloc(unsigned long size)
158{
159	return (unsigned long) vmalloc(size);
160
161}
162
163#define nodma_mem_alloc(size) vdma_mem_alloc(size)
164
165static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
166{
167	if((unsigned int) addr >= (unsigned int) high_memory)
168		return vfree((void *)addr);
169	else
170		free_pages(addr, get_order(size));		
171}
172
173#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size) 
174
175static void _fd_chose_dma_mode(char *addr, unsigned long size)
176{
177	if(can_use_virtual_dma == 2) {
178		if((unsigned int) addr >= (unsigned int) high_memory ||
179		   virt_to_phys(addr) >= 0x1000000 ||
180		   _CROSS_64KB(addr, size, 0))
181			use_virtual_dma = 1;
182		else
183			use_virtual_dma = 0;
184	} else {
185		use_virtual_dma = can_use_virtual_dma & 1;
186	}
187}
188
189#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
190
191
192static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
193{
194	doing_pdma = 1;
195	virtual_dma_port = io;
196	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
197	virtual_dma_addr = addr;
198	virtual_dma_count = size;
199	virtual_dma_residue = 0;
200	return 0;
201}
202
203static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
204{
205#ifdef FLOPPY_SANITY_CHECK
206	if (_CROSS_64KB(addr, size, use_virtual_dma & 1)) {
207		printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
208		return -1;
209	}
210#endif
211	/* actual, physical DMA */
212	doing_pdma = 0;
213	clear_dma_ff(FLOPPY_DMA);
214	set_dma_mode(FLOPPY_DMA,mode);
215	set_dma_addr(FLOPPY_DMA,virt_to_phys(addr));
216	set_dma_count(FLOPPY_DMA,size);
217	enable_dma(FLOPPY_DMA);
218	return 0;
219}
220
221static struct fd_routine_l {
222	int (*_request_dma)(unsigned int dmanr, const char * device_id);
223	void (*_free_dma)(unsigned int dmanr);
224	int (*_get_dma_residue)(unsigned int dummy);
225	unsigned long (*_dma_mem_alloc) (unsigned long size);
226	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
227} fd_routine[] = {
228	{
229		request_dma,
230		free_dma,
231		get_dma_residue,
232		dma_mem_alloc,
233		hard_dma_setup
234	},
235	{
236		vdma_request_dma,
237		vdma_nop,
238		vdma_get_dma_residue,
239		vdma_mem_alloc,
240		vdma_dma_setup
241	}
242};
243
244
245static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
246static int FDC2 = -1;
247
248#define FLOPPY0_TYPE	0
249#define FLOPPY1_TYPE	0
250
251#define N_FDC 1
252#define N_DRIVE 8
253
254#define EXTRA_FLOPPY_PARAMS
255
256#endif /* __ASM_PARISC_FLOPPY_H */