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/vmalloc.h>
12
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) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
24
25#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
26
27
28#define SW fd_routine[use_virtual_dma&1]
29#define CSW fd_routine[can_use_virtual_dma & 1]
30
31
32#define fd_inb(base, reg)		readb((base) + (reg))
33#define fd_outb(value, base, reg)	writeb(value, (base) + (reg))
34
35#define fd_request_dma()        CSW._request_dma(FLOPPY_DMA,"floppy")
36#define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
37#define fd_enable_irq()         enable_irq(FLOPPY_IRQ)
38#define fd_disable_irq()        disable_irq(FLOPPY_IRQ)
39#define fd_free_irq()		free_irq(FLOPPY_IRQ, NULL)
40#define fd_get_dma_residue()    SW._get_dma_residue(FLOPPY_DMA)
41#define fd_dma_mem_alloc(size)	SW._dma_mem_alloc(size)
42#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
43
44#define FLOPPY_CAN_FALLBACK_ON_NODMA
45
46static int virtual_dma_count=0;
47static int virtual_dma_residue=0;
48static char *virtual_dma_addr=0;
49static int virtual_dma_mode=0;
50static int doing_pdma=0;
51
52static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
53{
54	register unsigned char st;
55
56#undef TRACE_FLPY_INT
57
58#ifdef TRACE_FLPY_INT
59	static int calls=0;
60	static int bytes=0;
61	static int dma_wait=0;
62#endif
63	if (!doing_pdma) {
64		floppy_interrupt(irq, dev_id, regs);
65		return;
66	}
67
68#ifdef TRACE_FLPY_INT
69	if(!calls)
70		bytes = virtual_dma_count;
71#endif
72
73	{
74		register int lcount;
75		register char *lptr = virtual_dma_addr;
76
77		for (lcount = virtual_dma_count; lcount; lcount--) {
78			st = fd_inb(virtual_dma_port, FD_STATUS);
79			st &= STATUS_DMA | STATUS_READY;
80			if (st != (STATUS_DMA | STATUS_READY))
81				break;
82			if (virtual_dma_mode) {
83				fd_outb(*lptr, virtual_dma_port, FD_DATA);
84			} else {
85				*lptr = fd_inb(virtual_dma_port, FD_DATA);
86			}
87			lptr++;
88		}
89		virtual_dma_count = lcount;
90		virtual_dma_addr = lptr;
91		st = fd_inb(virtual_dma_port, FD_STATUS);
92	}
93
94#ifdef TRACE_FLPY_INT
95	calls++;
96#endif
97	if (st == STATUS_DMA)
98		return;
99	if (!(st & STATUS_DMA)) {
100		virtual_dma_residue += virtual_dma_count;
101		virtual_dma_count = 0;
102#ifdef TRACE_FLPY_INT
103		printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
104		       virtual_dma_count, virtual_dma_residue, calls, bytes,
105		       dma_wait);
106		calls = 0;
107		dma_wait=0;
108#endif
109		doing_pdma = 0;
110		floppy_interrupt(irq, dev_id, regs);
111		return;
112	}
113#ifdef TRACE_FLPY_INT
114	if (!virtual_dma_count)
115		dma_wait++;
116#endif
117}
118
119static void fd_disable_dma(void)
120{
121	if(! (can_use_virtual_dma & 1))
122		disable_dma(FLOPPY_DMA);
123	doing_pdma = 0;
124	virtual_dma_residue += virtual_dma_count;
125	virtual_dma_count=0;
126}
127
128static int vdma_request_dma(unsigned int dmanr, const char * device_id)
129{
130	return 0;
131}
132
133static void vdma_nop(unsigned int dummy)
134{
135}
136
137
138static int vdma_get_dma_residue(unsigned int dummy)
139{
140	return virtual_dma_count + virtual_dma_residue;
141}
142
143
144static int fd_request_irq(void)
145{
146	if(can_use_virtual_dma)
147		return request_irq(FLOPPY_IRQ, floppy_hardint,
148				   0, "floppy", NULL);
149	else
150		return request_irq(FLOPPY_IRQ, floppy_interrupt,
151				   0, "floppy", NULL);
152}
153
154static unsigned long dma_mem_alloc(unsigned long size)
155{
156	return __get_dma_pages(GFP_KERNEL, get_order(size));
157}
158
159
160static unsigned long vdma_mem_alloc(unsigned long size)
161{
162	return (unsigned long) vmalloc(size);
163
164}
165
166#define nodma_mem_alloc(size) vdma_mem_alloc(size)
167
168static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
169{
170	if((unsigned int) addr >= (unsigned int) high_memory)
171		return vfree((void *)addr);
172	else
173		free_pages(addr, get_order(size));
174}
175
176#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
177
178static void _fd_chose_dma_mode(char *addr, unsigned long size)
179{
180	if(can_use_virtual_dma == 2) {
181		if((unsigned int) addr >= (unsigned int) high_memory ||
182		   virt_to_phys(addr) >= 0x1000000 ||
183		   _CROSS_64KB(addr, size, 0))
184			use_virtual_dma = 1;
185		else
186			use_virtual_dma = 0;
187	} else {
188		use_virtual_dma = can_use_virtual_dma & 1;
189	}
190}
191
192#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
193
194
195static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
196{
197	doing_pdma = 1;
198	virtual_dma_port = io;
199	virtual_dma_mode = (mode  == DMA_MODE_WRITE);
200	virtual_dma_addr = addr;
201	virtual_dma_count = size;
202	virtual_dma_residue = 0;
203	return 0;
204}
205
206static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
207{
208#ifdef FLOPPY_SANITY_CHECK
209	if (CROSS_64KB(addr, size)) {
210		printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
211		return -1;
212	}
213#endif
214	/* actual, physical DMA */
215	doing_pdma = 0;
216	clear_dma_ff(FLOPPY_DMA);
217	set_dma_mode(FLOPPY_DMA,mode);
218	set_dma_addr(FLOPPY_DMA,virt_to_phys(addr));
219	set_dma_count(FLOPPY_DMA,size);
220	enable_dma(FLOPPY_DMA);
221	return 0;
222}
223
224static struct fd_routine_l {
225	int (*_request_dma)(unsigned int dmanr, const char * device_id);
226	void (*_free_dma)(unsigned int dmanr);
227	int (*_get_dma_residue)(unsigned int dummy);
228	unsigned long (*_dma_mem_alloc) (unsigned long size);
229	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
230} fd_routine[] = {
231	{
232		request_dma,
233		free_dma,
234		get_dma_residue,
235		dma_mem_alloc,
236		hard_dma_setup
237	},
238	{
239		vdma_request_dma,
240		vdma_nop,
241		vdma_get_dma_residue,
242		vdma_mem_alloc,
243		vdma_dma_setup
244	}
245};
246
247
248static int FDC1 = 0x3f0; /* Lies.  Floppy controller is memory mapped, not io mapped */
249static int FDC2 = -1;
250
251#define FLOPPY0_TYPE	0
252#define FLOPPY1_TYPE	0
253
254#define N_FDC 1
255#define N_DRIVE 8
256
257#define EXTRA_FLOPPY_PARAMS
258
259#endif /* __ASM_PARISC_FLOPPY_H */
260