1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
5 */
6
7 #ifndef __ASM_SPARC_FLOPPY_H
8 #define __ASM_SPARC_FLOPPY_H
9
10 #include <linux/of.h>
11 #include <linux/of_platform.h>
12 #include <linux/pgtable.h>
13
14 #include <asm/idprom.h>
15 #include <asm/oplib.h>
16 #include <asm/auxio.h>
17 #include <asm/setup.h>
18 #include <asm/page.h>
19 #include <asm/irq.h>
20
21 /* We don't need no stinkin' I/O port allocation crap. */
22 #undef release_region
23 #undef request_region
24 #define release_region(X, Y) do { } while(0)
25 #define request_region(X, Y, Z) (1)
26
27 /* References:
28 * 1) Netbsd Sun floppy driver.
29 * 2) NCR 82077 controller manual
30 * 3) Intel 82077 controller manual
31 */
32 struct sun_flpy_controller {
33 volatile unsigned char status_82072; /* Main Status reg. */
34 #define dcr_82072 status_82072 /* Digital Control reg. */
35 #define status1_82077 status_82072 /* Auxiliary Status reg. 1 */
36
37 volatile unsigned char data_82072; /* Data fifo. */
38 #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
39
40 volatile unsigned char dor_82077; /* Digital Output reg. */
41 volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
42
43 volatile unsigned char status_82077; /* Main Status Register. */
44 #define drs_82077 status_82077 /* Digital Rate Select reg. */
45
46 volatile unsigned char data_82077; /* Data fifo. */
47 volatile unsigned char ___unused;
48 volatile unsigned char dir_82077; /* Digital Input reg. */
49 #define dcr_82077 dir_82077 /* Config Control reg. */
50 };
51
52 /* You'll only ever find one controller on a SparcStation anyways. */
53 static struct sun_flpy_controller *sun_fdc = NULL;
54
55 struct sun_floppy_ops {
56 unsigned char (*fd_inb)(int port);
57 void (*fd_outb)(unsigned char value, int port);
58 };
59
60 static struct sun_floppy_ops sun_fdops;
61
62 #define fd_inb(base, reg) sun_fdops.fd_inb(reg)
63 #define fd_outb(value, base, reg) sun_fdops.fd_outb(value, reg)
64 #define fd_enable_dma() sun_fd_enable_dma()
65 #define fd_disable_dma() sun_fd_disable_dma()
66 #define fd_request_dma() (0) /* nothing... */
67 #define fd_free_dma() /* nothing... */
68 #define fd_clear_dma_ff() /* nothing... */
69 #define fd_set_dma_mode(mode) sun_fd_set_dma_mode(mode)
70 #define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)
71 #define fd_set_dma_count(count) sun_fd_set_dma_count(count)
72 #define fd_enable_irq() /* nothing... */
73 #define fd_disable_irq() /* nothing... */
74 #define fd_request_irq() sun_fd_request_irq()
75 #define fd_free_irq() /* nothing... */
76 #if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
77 #define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
78 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
79 #endif
80
81 /* XXX This isn't really correct. XXX */
82 #define get_dma_residue(x) (0)
83
84 #define FLOPPY0_TYPE 4
85 #define FLOPPY1_TYPE 0
86
87 /* Super paranoid... */
88 #undef HAVE_DISABLE_HLT
89
90 /* Here is where we catch the floppy driver trying to initialize,
91 * therefore this is where we call the PROM device tree probing
92 * routine etc. on the Sparc.
93 */
94 #define FDC1 sun_floppy_init()
95
96 #define N_FDC 1
97 #define N_DRIVE 8
98
99 /* No 64k boundary crossing problems on the Sparc. */
100 #define CROSS_64KB(a,s) (0)
101
102 /* Routines unique to each controller type on a Sun. */
sun_set_dor(unsigned char value,int fdc_82077)103 static void sun_set_dor(unsigned char value, int fdc_82077)
104 {
105 if (fdc_82077)
106 sun_fdc->dor_82077 = value;
107 }
108
sun_read_dir(void)109 static unsigned char sun_read_dir(void)
110 {
111 return sun_fdc->dir_82077;
112 }
113
sun_82072_fd_inb(int port)114 static unsigned char sun_82072_fd_inb(int port)
115 {
116 udelay(5);
117 switch (port) {
118 default:
119 printk("floppy: Asked to read unknown port %d\n", port);
120 panic("floppy: Port bolixed.");
121 case FD_STATUS:
122 return sun_fdc->status_82072 & ~STATUS_DMA;
123 case FD_DATA:
124 return sun_fdc->data_82072;
125 case FD_DIR:
126 return sun_read_dir();
127 }
128 panic("sun_82072_fd_inb: How did I get here?");
129 }
130
sun_82072_fd_outb(unsigned char value,int port)131 static void sun_82072_fd_outb(unsigned char value, int port)
132 {
133 udelay(5);
134 switch (port) {
135 default:
136 printk("floppy: Asked to write to unknown port %d\n", port);
137 panic("floppy: Port bolixed.");
138 case FD_DOR:
139 sun_set_dor(value, 0);
140 break;
141 case FD_DATA:
142 sun_fdc->data_82072 = value;
143 break;
144 case FD_DCR:
145 sun_fdc->dcr_82072 = value;
146 break;
147 case FD_DSR:
148 sun_fdc->status_82072 = value;
149 break;
150 }
151 return;
152 }
153
sun_82077_fd_inb(int port)154 static unsigned char sun_82077_fd_inb(int port)
155 {
156 udelay(5);
157 switch (port) {
158 default:
159 printk("floppy: Asked to read unknown port %d\n", port);
160 panic("floppy: Port bolixed.");
161 case FD_SRA:
162 return sun_fdc->status1_82077;
163 case FD_SRB:
164 return sun_fdc->status2_82077;
165 case FD_DOR:
166 return sun_fdc->dor_82077;
167 case FD_TDR:
168 return sun_fdc->tapectl_82077;
169 case FD_STATUS:
170 return sun_fdc->status_82077 & ~STATUS_DMA;
171 case FD_DATA:
172 return sun_fdc->data_82077;
173 case FD_DIR:
174 return sun_read_dir();
175 }
176 panic("sun_82077_fd_inb: How did I get here?");
177 }
178
sun_82077_fd_outb(unsigned char value,int port)179 static void sun_82077_fd_outb(unsigned char value, int port)
180 {
181 udelay(5);
182 switch (port) {
183 default:
184 printk("floppy: Asked to write to unknown port %d\n", port);
185 panic("floppy: Port bolixed.");
186 case FD_DOR:
187 sun_set_dor(value, 1);
188 break;
189 case FD_DATA:
190 sun_fdc->data_82077 = value;
191 break;
192 case FD_DCR:
193 sun_fdc->dcr_82077 = value;
194 break;
195 case FD_DSR:
196 sun_fdc->status_82077 = value;
197 break;
198 case FD_TDR:
199 sun_fdc->tapectl_82077 = value;
200 break;
201 }
202 return;
203 }
204
205 /* For pseudo-dma (Sun floppy drives have no real DMA available to
206 * them so we must eat the data fifo bytes directly ourselves) we have
207 * three state variables. doing_pdma tells our inline low-level
208 * assembly floppy interrupt entry point whether it should sit and eat
209 * bytes from the fifo or just transfer control up to the higher level
210 * floppy interrupt c-code. I tried very hard but I could not get the
211 * pseudo-dma to work in c-code without getting many overruns and
212 * underruns. If non-zero, doing_pdma encodes the direction of
213 * the transfer for debugging. 1=read 2=write
214 */
215
216 /* Common routines to all controller types on the Sparc. */
virtual_dma_init(void)217 static inline void virtual_dma_init(void)
218 {
219 /* nothing... */
220 }
221
sun_fd_disable_dma(void)222 static inline void sun_fd_disable_dma(void)
223 {
224 doing_pdma = 0;
225 pdma_base = NULL;
226 }
227
sun_fd_set_dma_mode(int mode)228 static inline void sun_fd_set_dma_mode(int mode)
229 {
230 switch(mode) {
231 case DMA_MODE_READ:
232 doing_pdma = 1;
233 break;
234 case DMA_MODE_WRITE:
235 doing_pdma = 2;
236 break;
237 default:
238 printk("Unknown dma mode %d\n", mode);
239 panic("floppy: Giving up...");
240 }
241 }
242
sun_fd_set_dma_addr(char * buffer)243 static inline void sun_fd_set_dma_addr(char *buffer)
244 {
245 pdma_vaddr = buffer;
246 }
247
sun_fd_set_dma_count(int length)248 static inline void sun_fd_set_dma_count(int length)
249 {
250 pdma_size = length;
251 }
252
sun_fd_enable_dma(void)253 static inline void sun_fd_enable_dma(void)
254 {
255 pdma_base = pdma_vaddr;
256 pdma_areasize = pdma_size;
257 }
258
259 int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler);
260
sun_fd_request_irq(void)261 static int sun_fd_request_irq(void)
262 {
263 static int once = 0;
264
265 if (!once) {
266 once = 1;
267 return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
268 } else {
269 return 0;
270 }
271 }
272
273 static struct linux_prom_registers fd_regs[2];
274
sun_floppy_init(void)275 static int sun_floppy_init(void)
276 {
277 struct platform_device *op;
278 struct device_node *dp;
279 struct resource r;
280 char state[128];
281 phandle fd_node;
282 phandle tnode;
283 int num_regs;
284
285 use_virtual_dma = 1;
286
287 /* Forget it if we aren't on a machine that could possibly
288 * ever have a floppy drive.
289 */
290 if (sparc_cpu_model != sun4m) {
291 /* We certainly don't have a floppy controller. */
292 goto no_sun_fdc;
293 }
294 /* Well, try to find one. */
295 tnode = prom_getchild(prom_root_node);
296 fd_node = prom_searchsiblings(tnode, "obio");
297 if (fd_node != 0) {
298 tnode = prom_getchild(fd_node);
299 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
300 } else {
301 fd_node = prom_searchsiblings(tnode, "fd");
302 }
303 if (fd_node == 0) {
304 goto no_sun_fdc;
305 }
306
307 /* The sun4m lets us know if the controller is actually usable. */
308 if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
309 if(!strcmp(state, "disabled")) {
310 goto no_sun_fdc;
311 }
312 }
313 num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
314 num_regs = (num_regs / sizeof(fd_regs[0]));
315 prom_apply_obio_ranges(fd_regs, num_regs);
316 memset(&r, 0, sizeof(r));
317 r.flags = fd_regs[0].which_io;
318 r.start = fd_regs[0].phys_addr;
319 sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
320
321 /* Look up irq in platform_device.
322 * We try "SUNW,fdtwo" and "fd"
323 */
324 op = NULL;
325 for_each_node_by_name(dp, "SUNW,fdtwo") {
326 op = of_find_device_by_node(dp);
327 if (op)
328 break;
329 }
330 if (!op) {
331 for_each_node_by_name(dp, "fd") {
332 op = of_find_device_by_node(dp);
333 if (op)
334 break;
335 }
336 }
337 if (!op)
338 goto no_sun_fdc;
339
340 FLOPPY_IRQ = op->archdata.irqs[0];
341
342 /* Last minute sanity check... */
343 if (sun_fdc->status_82072 == 0xff) {
344 sun_fdc = NULL;
345 goto no_sun_fdc;
346 }
347
348 sun_fdops.fd_inb = sun_82077_fd_inb;
349 sun_fdops.fd_outb = sun_82077_fd_outb;
350 fdc_status = &sun_fdc->status_82077;
351
352 if (sun_fdc->dor_82077 == 0x80) {
353 sun_fdc->dor_82077 = 0x02;
354 if (sun_fdc->dor_82077 == 0x80) {
355 sun_fdops.fd_inb = sun_82072_fd_inb;
356 sun_fdops.fd_outb = sun_82072_fd_outb;
357 fdc_status = &sun_fdc->status_82072;
358 }
359 }
360
361 /* Success... */
362 allowed_drive_mask = 0x01;
363 return (int) sun_fdc;
364
365 no_sun_fdc:
366 return -1;
367 }
368
sparc_eject(void)369 static int sparc_eject(void)
370 {
371 set_dor(0x00, 0xff, 0x90);
372 udelay(500);
373 set_dor(0x00, 0x6f, 0x00);
374 udelay(500);
375 return 0;
376 }
377
378 #define fd_eject(drive) sparc_eject()
379
380 #define EXTRA_FLOPPY_PARAMS
381
382 static DEFINE_SPINLOCK(dma_spin_lock);
383
384 #define claim_dma_lock() \
385 ({ unsigned long flags; \
386 spin_lock_irqsave(&dma_spin_lock, flags); \
387 flags; \
388 })
389
390 #define release_dma_lock(__flags) \
391 spin_unlock_irqrestore(&dma_spin_lock, __flags);
392
393 #endif /* !(__ASM_SPARC_FLOPPY_H) */
394