1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* sun3xflop.h: Sun3/80 specific parts of the floppy driver.
3 *
4 * Derived partially from asm-sparc/floppy.h, which is:
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 *
7 * Sun3x version 2/4/2000 Sam Creasey (sammy@sammy.net)
8 */
9
10 #ifndef __ASM_SUN3X_FLOPPY_H
11 #define __ASM_SUN3X_FLOPPY_H
12
13 #include <linux/pgtable.h>
14 #include <asm/page.h>
15 #include <asm/irq.h>
16 #include <asm/sun3x.h>
17
18 /* default interrupt vector */
19 #define SUN3X_FDC_IRQ 0x40
20
21 /* some constants */
22 #define FCR_TC 0x1
23 #define FCR_EJECT 0x2
24 #define FCR_MTRON 0x4
25 #define FCR_DSEL1 0x8
26 #define FCR_DSEL0 0x10
27
28 /* We don't need no stinkin' I/O port allocation crap. */
29 #undef release_region
30 #undef request_region
31 #define release_region(X, Y) do { } while(0)
32 #define request_region(X, Y, Z) (1)
33
34 struct sun3xflop_private {
35 volatile unsigned char *status_r;
36 volatile unsigned char *data_r;
37 volatile unsigned char *fcr_r;
38 volatile unsigned char *fvr_r;
39 unsigned char fcr;
40 } sun3x_fdc;
41
42 /* Super paranoid... */
43 #undef HAVE_DISABLE_HLT
44
45 /* Routines unique to each controller type on a Sun. */
46 static unsigned char sun3x_82072_fd_inb(int port)
47 {
48 static int once = 0;
49 // udelay(5);
50 switch(port & 7) {
51 default:
52 pr_crit("floppy: Asked to read unknown port %d\n", port);
53 panic("floppy: Port bolixed.");
54 case 4: /* FD_STATUS */
55 return (*sun3x_fdc.status_r) & ~STATUS_DMA;
56 case 5: /* FD_DATA */
57 return (*sun3x_fdc.data_r);
58 case 7: /* FD_DIR */
59 /* ugly hack, I can't find a way to actually detect the disk */
60 if(!once) {
61 once = 1;
62 return 0x80;
63 }
64 return 0;
65 };
66 panic("sun_82072_fd_inb: How did I get here?");
67 }
68
69 static void sun3x_82072_fd_outb(unsigned char value, int port)
70 {
71 // udelay(5);
72 switch(port & 7) {
73 default:
74 pr_crit("floppy: Asked to write to unknown port %d\n", port);
75 panic("floppy: Port bolixed.");
76 case 2: /* FD_DOR */
77 /* Oh geese, 82072 on the Sun has no DOR register,
78 * so we make do with taunting the FCR.
79 *
80 * ASSUMPTIONS: There will only ever be one floppy
81 * drive attached to a Sun controller
82 * and it will be at drive zero.
83 */
84
85 {
86 unsigned char fcr = sun3x_fdc.fcr;
87
88 if(value & 0x10) {
89 fcr |= (FCR_DSEL0 | FCR_MTRON);
90 } else
91 fcr &= ~(FCR_DSEL0 | FCR_MTRON);
92
93
94 if(fcr != sun3x_fdc.fcr) {
95 *(sun3x_fdc.fcr_r) = fcr;
96 sun3x_fdc.fcr = fcr;
97 }
98 }
99 break;
100 case 5: /* FD_DATA */
101 *(sun3x_fdc.data_r) = value;
102 break;
103 case 7: /* FD_DCR */
104 *(sun3x_fdc.status_r) = value;
105 break;
106 case 4: /* FD_STATUS */
107 *(sun3x_fdc.status_r) = value;
108 break;
109 }
110 return;
111 }
112
113
114 asmlinkage irqreturn_t sun3xflop_hardint(int irq, void *dev_id)
115 {
116 register unsigned char st;
117
118 #undef TRACE_FLPY_INT
119 #define NO_FLOPPY_ASSEMBLER
120
121 #ifdef TRACE_FLPY_INT
122 static int calls=0;
123 static int bytes=0;
124 static int dma_wait=0;
125 #endif
126 if(!doing_pdma) {
127 floppy_interrupt(irq, dev_id);
128 return IRQ_HANDLED;
129 }
130
131 // pr_info("doing pdma\n");// st %x\n", sun_fdc->status_82072);
132
133 #ifdef TRACE_FLPY_INT
134 if(!calls)
135 bytes = virtual_dma_count;
136 #endif
137
138 {
139 register int lcount;
140 register char *lptr;
141
142 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
143 lcount; lcount--, lptr++) {
144 /* st=fd_inb(virtual_dma_port+4) & 0x80 ; */
145 st = *(sun3x_fdc.status_r);
146 /* if(st != 0xa0) */
147 /* break; */
148
149 if((st & 0x80) == 0) {
150 virtual_dma_count = lcount;
151 virtual_dma_addr = lptr;
152 return IRQ_HANDLED;
153 }
154
155 if((st & 0x20) == 0)
156 break;
157
158 if(virtual_dma_mode)
159 /* fd_outb(*lptr, virtual_dma_port+5); */
160 *(sun3x_fdc.data_r) = *lptr;
161 else
162 /* *lptr = fd_inb(virtual_dma_port+5); */
163 *lptr = *(sun3x_fdc.data_r);
164 }
165
166 virtual_dma_count = lcount;
167 virtual_dma_addr = lptr;
168 /* st = fd_inb(virtual_dma_port+4); */
169 st = *(sun3x_fdc.status_r);
170 }
171
172 #ifdef TRACE_FLPY_INT
173 calls++;
174 #endif
175 // pr_info("st=%02x\n", st);
176 if(st == 0x20)
177 return IRQ_HANDLED;
178 if(!(st & 0x20)) {
179 virtual_dma_residue += virtual_dma_count;
180 virtual_dma_count=0;
181 doing_pdma = 0;
182
183 #ifdef TRACE_FLPY_INT
184 pr_info("count=%x, residue=%x calls=%d bytes=%x dma_wait=%d\n",
185 virtual_dma_count, virtual_dma_residue, calls, bytes,
186 dma_wait);
187 calls = 0;
188 dma_wait=0;
189 #endif
190
191 floppy_interrupt(irq, dev_id);
192 return IRQ_HANDLED;
193 }
194
195
196 #ifdef TRACE_FLPY_INT
197 if(!virtual_dma_count)
198 dma_wait++;
199 #endif
200 return IRQ_HANDLED;
201 }
202
203 static int sun3xflop_request_irq(void)
204 {
205 static int once = 0;
206 int error;
207
208 if(!once) {
209 once = 1;
210 error = request_irq(FLOPPY_IRQ, sun3xflop_hardint,
211 0, "floppy", NULL);
212 return ((error == 0) ? 0 : -1);
213 } else return 0;
214 }
215
216 static void __init floppy_set_flags(int *ints,int param, int param2);
217
218 static int sun3xflop_init(void)
219 {
220 if(FLOPPY_IRQ < 0x40)
221 FLOPPY_IRQ = SUN3X_FDC_IRQ;
222
223 sun3x_fdc.status_r = (volatile unsigned char *)SUN3X_FDC;
224 sun3x_fdc.data_r = (volatile unsigned char *)(SUN3X_FDC+1);
225 sun3x_fdc.fcr_r = (volatile unsigned char *)SUN3X_FDC_FCR;
226 sun3x_fdc.fvr_r = (volatile unsigned char *)SUN3X_FDC_FVR;
227 sun3x_fdc.fcr = 0;
228
229 /* Last minute sanity check... */
230 if(*sun3x_fdc.status_r == 0xff) {
231 return -1;
232 }
233
234 *sun3x_fdc.fvr_r = FLOPPY_IRQ;
235
236 *sun3x_fdc.fcr_r = FCR_TC;
237 udelay(10);
238 *sun3x_fdc.fcr_r = 0;
239
240 /* Success... */
241 floppy_set_flags(NULL, 1, FD_BROKEN_DCL); // I don't know how to detect this.
242 allowed_drive_mask = 0x01;
243 return (int) SUN3X_FDC;
244 }
245
246 /* I'm not precisely sure this eject routine works */
247 static int sun3x_eject(void)
248 {
249 if(MACH_IS_SUN3X) {
250
251 sun3x_fdc.fcr |= (FCR_DSEL0 | FCR_EJECT);
252 *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
253 udelay(10);
254 sun3x_fdc.fcr &= ~(FCR_DSEL0 | FCR_EJECT);
255 *(sun3x_fdc.fcr_r) = sun3x_fdc.fcr;
256 }
257
258 return 0;
259 }
260
261 #define fd_eject(drive) sun3x_eject()
262
263 #endif /* !(__ASM_SUN3X_FLOPPY_H) */
264
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