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
46 static int virtual_dma_count=0;
47 static int virtual_dma_residue=0;
48 static char *virtual_dma_addr=0;
49 static int virtual_dma_mode=0;
50 static int doing_pdma=0;
51
floppy_hardint(int irq,void * dev_id,struct pt_regs * regs)52 static 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
fd_disable_dma(void)119 static 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
vdma_request_dma(unsigned int dmanr,const char * device_id)128 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
129 {
130 return 0;
131 }
132
vdma_nop(unsigned int dummy)133 static void vdma_nop(unsigned int dummy)
134 {
135 }
136
137
vdma_get_dma_residue(unsigned int dummy)138 static int vdma_get_dma_residue(unsigned int dummy)
139 {
140 return virtual_dma_count + virtual_dma_residue;
141 }
142
143
fd_request_irq(void)144 static 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
dma_mem_alloc(unsigned long size)154 static unsigned long dma_mem_alloc(unsigned long size)
155 {
156 return __get_dma_pages(GFP_KERNEL, get_order(size));
157 }
158
159
vdma_mem_alloc(unsigned long size)160 static 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
_fd_dma_mem_free(unsigned long addr,unsigned long size)168 static 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
_fd_chose_dma_mode(char * addr,unsigned long size)178 static 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
vdma_dma_setup(char * addr,unsigned long size,int mode,int io)195 static 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
hard_dma_setup(char * addr,unsigned long size,int mode,int io)206 static 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
224 static 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
248 static int FDC1 = 0x3f0; /* Lies. Floppy controller is memory mapped, not io mapped */
249 static 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