1 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
3 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
6 #ifndef __ASM_SPARC_FLOPPY_H
7 #define __ASM_SPARC_FLOPPY_H
10 #include <asm/pgtable.h>
11 #include <asm/system.h>
12 #include <asm/idprom.h>
13 #include <asm/machines.h>
14 #include <asm/oplib.h>
15 #include <asm/auxio.h>
18 /* We don't need no stinkin' I/O port allocation crap. */
21 #define release_region(X, Y) do { } while(0)
22 #define request_region(X, Y, Z) (1)
25 * 1) Netbsd Sun floppy driver.
26 * 2) NCR 82077 controller manual
27 * 3) Intel 82077 controller manual
29 struct sun_flpy_controller {
30 volatile unsigned char status_82072; /* Main Status reg. */
31 #define dcr_82072 status_82072 /* Digital Control reg. */
32 #define status1_82077 status_82072 /* Auxiliary Status reg. 1 */
34 volatile unsigned char data_82072; /* Data fifo. */
35 #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
37 volatile unsigned char dor_82077; /* Digital Output reg. */
38 volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
40 volatile unsigned char status_82077; /* Main Status Register. */
41 #define drs_82077 status_82077 /* Digital Rate Select reg. */
43 volatile unsigned char data_82077; /* Data fifo. */
44 volatile unsigned char ___unused;
45 volatile unsigned char dir_82077; /* Digital Input reg. */
46 #define dcr_82077 dir_82077 /* Config Control reg. */
49 /* You'll only ever find one controller on a SparcStation anyways. */
50 static struct sun_flpy_controller *sun_fdc = NULL;
51 extern volatile unsigned char *fdc_status;
53 struct sun_floppy_ops {
54 unsigned char (*fd_inb)(int port);
55 void (*fd_outb)(unsigned char value, int port);
58 static struct sun_floppy_ops sun_fdops;
60 #define fd_inb(port) sun_fdops.fd_inb(port)
61 #define fd_outb(value,port) sun_fdops.fd_outb(value,port)
62 #define fd_enable_dma() sun_fd_enable_dma()
63 #define fd_disable_dma() sun_fd_disable_dma()
64 #define fd_request_dma() (0) /* nothing... */
65 #define fd_free_dma() /* nothing... */
66 #define fd_clear_dma_ff() /* nothing... */
67 #define fd_set_dma_mode(mode) sun_fd_set_dma_mode(mode)
68 #define fd_set_dma_addr(addr) sun_fd_set_dma_addr(addr)
69 #define fd_set_dma_count(count) sun_fd_set_dma_count(count)
70 #define fd_enable_irq() /* nothing... */
71 #define fd_disable_irq() /* nothing... */
72 #define fd_cacheflush(addr, size) /* nothing... */
73 #define fd_request_irq() sun_fd_request_irq()
74 #define fd_free_irq() /* nothing... */
75 #if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
76 #define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
77 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
80 /* XXX This isn't really correct. XXX */
81 #define get_dma_residue(x) (0)
83 #define FLOPPY0_TYPE 4
84 #define FLOPPY1_TYPE 0
86 /* Super paranoid... */
87 #undef HAVE_DISABLE_HLT
89 /* Here is where we catch the floppy driver trying to initialize,
90 * therefore this is where we call the PROM device tree probing
91 * routine etc. on the Sparc.
93 #define FDC1 sun_floppy_init()
98 /* No 64k boundary crossing problems on the Sparc. */
99 #define CROSS_64KB(a,s) (0)
101 /* Routines unique to each controller type on a Sun. */
102 static void sun_set_dor(unsigned char value, int fdc_82077)
104 if (sparc_cpu_model == sun4c) {
105 unsigned int bits = 0;
107 bits |= AUXIO_FLPY_DSEL;
108 if ((value & 0x80) == 0)
109 bits |= AUXIO_FLPY_EJCT;
110 set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
113 sun_fdc->dor_82077 = value;
117 static unsigned char sun_read_dir(void)
119 if (sparc_cpu_model == sun4c)
120 return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
122 return sun_fdc->dir_82077;
125 static unsigned char sun_82072_fd_inb(int port)
130 printk("floppy: Asked to read unknown port %d\n", port);
131 panic("floppy: Port bolixed.");
132 case 4: /* FD_STATUS */
133 return sun_fdc->status_82072 & ~STATUS_DMA;
134 case 5: /* FD_DATA */
135 return sun_fdc->data_82072;
137 return sun_read_dir();
139 panic("sun_82072_fd_inb: How did I get here?");
142 static void sun_82072_fd_outb(unsigned char value, int port)
147 printk("floppy: Asked to write to unknown port %d\n", port);
148 panic("floppy: Port bolixed.");
150 sun_set_dor(value, 0);
152 case 5: /* FD_DATA */
153 sun_fdc->data_82072 = value;
156 sun_fdc->dcr_82072 = value;
158 case 4: /* FD_STATUS */
159 sun_fdc->status_82072 = value;
165 static unsigned char sun_82077_fd_inb(int port)
170 printk("floppy: Asked to read unknown port %d\n", port);
171 panic("floppy: Port bolixed.");
172 case 0: /* FD_STATUS_0 */
173 return sun_fdc->status1_82077;
174 case 1: /* FD_STATUS_1 */
175 return sun_fdc->status2_82077;
177 return sun_fdc->dor_82077;
179 return sun_fdc->tapectl_82077;
180 case 4: /* FD_STATUS */
181 return sun_fdc->status_82077 & ~STATUS_DMA;
182 case 5: /* FD_DATA */
183 return sun_fdc->data_82077;
185 return sun_read_dir();
187 panic("sun_82077_fd_inb: How did I get here?");
190 static void sun_82077_fd_outb(unsigned char value, int port)
195 printk("floppy: Asked to write to unknown port %d\n", port);
196 panic("floppy: Port bolixed.");
198 sun_set_dor(value, 1);
200 case 5: /* FD_DATA */
201 sun_fdc->data_82077 = value;
204 sun_fdc->dcr_82077 = value;
206 case 4: /* FD_STATUS */
207 sun_fdc->status_82077 = value;
210 sun_fdc->tapectl_82077 = value;
216 /* For pseudo-dma (Sun floppy drives have no real DMA available to
217 * them so we must eat the data fifo bytes directly ourselves) we have
218 * three state variables. doing_pdma tells our inline low-level
219 * assembly floppy interrupt entry point whether it should sit and eat
220 * bytes from the fifo or just transfer control up to the higher level
221 * floppy interrupt c-code. I tried very hard but I could not get the
222 * pseudo-dma to work in c-code without getting many overruns and
223 * underruns. If non-zero, doing_pdma encodes the direction of
224 * the transfer for debugging. 1=read 2=write
226 extern char *pdma_vaddr;
227 extern unsigned long pdma_size;
228 extern volatile int doing_pdma;
230 /* This is software state */
231 extern char *pdma_base;
232 extern unsigned long pdma_areasize;
234 /* Common routines to all controller types on the Sparc. */
235 static inline void virtual_dma_init(void)
240 static inline void sun_fd_disable_dma(void)
244 mmu_unlockarea(pdma_base, pdma_areasize);
249 static inline void sun_fd_set_dma_mode(int mode)
259 printk("Unknown dma mode %d\n", mode);
260 panic("floppy: Giving up...");
264 static inline void sun_fd_set_dma_addr(char *buffer)
269 static inline void sun_fd_set_dma_count(int length)
274 static inline void sun_fd_enable_dma(void)
276 pdma_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
277 pdma_base = pdma_vaddr;
278 pdma_areasize = pdma_size;
281 /* Our low-level entry point in arch/sparc/kernel/entry.S */
282 extern int sparc_floppy_request_irq(int irq, unsigned long flags,
283 irq_handler_t irq_handler);
285 static int sun_fd_request_irq(void)
292 error = sparc_floppy_request_irq(FLOPPY_IRQ,
295 return ((error == 0) ? 0 : -1);
299 static struct linux_prom_registers fd_regs[2];
301 static int sun_floppy_init(void)
304 int tnode, fd_node, num_regs;
310 /* Forget it if we aren't on a machine that could possibly
311 * ever have a floppy drive.
313 if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
314 ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
315 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
316 /* We certainly don't have a floppy controller. */
319 /* Well, try to find one. */
320 tnode = prom_getchild(prom_root_node);
321 fd_node = prom_searchsiblings(tnode, "obio");
323 tnode = prom_getchild(fd_node);
324 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
326 fd_node = prom_searchsiblings(tnode, "fd");
332 /* The sun4m lets us know if the controller is actually usable. */
333 if(sparc_cpu_model == sun4m &&
334 prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
335 if(!strcmp(state, "disabled")) {
339 num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
340 num_regs = (num_regs / sizeof(fd_regs[0]));
341 prom_apply_obio_ranges(fd_regs, num_regs);
342 memset(&r, 0, sizeof(r));
343 r.flags = fd_regs[0].which_io;
344 r.start = fd_regs[0].phys_addr;
345 sun_fdc = (struct sun_flpy_controller *)
346 sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
348 /* Last minute sanity check... */
349 if(sun_fdc->status_82072 == 0xff) {
354 sun_fdops.fd_inb = sun_82077_fd_inb;
355 sun_fdops.fd_outb = sun_82077_fd_outb;
356 fdc_status = &sun_fdc->status_82077;
358 if (sun_fdc->dor_82077 == 0x80) {
359 sun_fdc->dor_82077 = 0x02;
360 if (sun_fdc->dor_82077 == 0x80) {
361 sun_fdops.fd_inb = sun_82072_fd_inb;
362 sun_fdops.fd_outb = sun_82072_fd_outb;
363 fdc_status = &sun_fdc->status_82072;
368 allowed_drive_mask = 0x01;
369 return (int) sun_fdc;
375 static int sparc_eject(void)
377 set_dor(0x00, 0xff, 0x90);
379 set_dor(0x00, 0x6f, 0x00);
384 #define fd_eject(drive) sparc_eject()
386 #define EXTRA_FLOPPY_PARAMS
388 #endif /* !(__ASM_SPARC_FLOPPY_H) */