1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* asm/floppy.h: Sparc specific parts of the Floppy driver.
4 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
7 #ifndef __ASM_SPARC_FLOPPY_H
8 #define __ASM_SPARC_FLOPPY_H
11 #include <linux/of_device.h>
13 #include <asm/pgtable.h>
14 #include <asm/idprom.h>
15 #include <asm/oplib.h>
16 #include <asm/auxio.h>
17 #include <asm/setup.h>
21 /* We don't need no stinkin' I/O port allocation crap. */
24 #define release_region(X, Y) do { } while(0)
25 #define request_region(X, Y, Z) (1)
28 * 1) Netbsd Sun floppy driver.
29 * 2) NCR 82077 controller manual
30 * 3) Intel 82077 controller manual
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 */
37 volatile unsigned char data_82072; /* Data fifo. */
38 #define status2_82077 data_82072 /* Auxiliary Status reg. 2 */
40 volatile unsigned char dor_82077; /* Digital Output reg. */
41 volatile unsigned char tapectl_82077; /* What the? Tape control reg? */
43 volatile unsigned char status_82077; /* Main Status Register. */
44 #define drs_82077 status_82077 /* Digital Rate Select reg. */
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. */
52 /* You'll only ever find one controller on a SparcStation anyways. */
53 static struct sun_flpy_controller *sun_fdc = NULL;
55 struct sun_floppy_ops {
56 unsigned char (*fd_inb)(int port);
57 void (*fd_outb)(unsigned char value, int port);
60 static struct sun_floppy_ops sun_fdops;
62 #define fd_inb(port) sun_fdops.fd_inb(port)
63 #define fd_outb(value,port) sun_fdops.fd_outb(value,port)
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_cacheflush(addr, size) /* nothing... */
75 #define fd_request_irq() sun_fd_request_irq()
76 #define fd_free_irq() /* nothing... */
77 #if 0 /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
78 #define fd_dma_mem_alloc(size) ((unsigned long) vmalloc(size))
79 #define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
82 /* XXX This isn't really correct. XXX */
83 #define get_dma_residue(x) (0)
85 #define FLOPPY0_TYPE 4
86 #define FLOPPY1_TYPE 0
88 /* Super paranoid... */
89 #undef HAVE_DISABLE_HLT
91 /* Here is where we catch the floppy driver trying to initialize,
92 * therefore this is where we call the PROM device tree probing
93 * routine etc. on the Sparc.
95 #define FDC1 sun_floppy_init()
100 /* No 64k boundary crossing problems on the Sparc. */
101 #define CROSS_64KB(a,s) (0)
103 /* Routines unique to each controller type on a Sun. */
104 static void sun_set_dor(unsigned char value, int fdc_82077)
107 sun_fdc->dor_82077 = value;
110 static unsigned char sun_read_dir(void)
112 return sun_fdc->dir_82077;
115 static unsigned char sun_82072_fd_inb(int port)
120 printk("floppy: Asked to read unknown port %d\n", port);
121 panic("floppy: Port bolixed.");
122 case 4: /* FD_STATUS */
123 return sun_fdc->status_82072 & ~STATUS_DMA;
124 case 5: /* FD_DATA */
125 return sun_fdc->data_82072;
127 return sun_read_dir();
129 panic("sun_82072_fd_inb: How did I get here?");
132 static void sun_82072_fd_outb(unsigned char value, int port)
137 printk("floppy: Asked to write to unknown port %d\n", port);
138 panic("floppy: Port bolixed.");
140 sun_set_dor(value, 0);
142 case 5: /* FD_DATA */
143 sun_fdc->data_82072 = value;
146 sun_fdc->dcr_82072 = value;
148 case 4: /* FD_STATUS */
149 sun_fdc->status_82072 = value;
155 static unsigned char sun_82077_fd_inb(int port)
160 printk("floppy: Asked to read unknown port %d\n", port);
161 panic("floppy: Port bolixed.");
162 case 0: /* FD_STATUS_0 */
163 return sun_fdc->status1_82077;
164 case 1: /* FD_STATUS_1 */
165 return sun_fdc->status2_82077;
167 return sun_fdc->dor_82077;
169 return sun_fdc->tapectl_82077;
170 case 4: /* FD_STATUS */
171 return sun_fdc->status_82077 & ~STATUS_DMA;
172 case 5: /* FD_DATA */
173 return sun_fdc->data_82077;
175 return sun_read_dir();
177 panic("sun_82077_fd_inb: How did I get here?");
180 static void sun_82077_fd_outb(unsigned char value, int port)
185 printk("floppy: Asked to write to unknown port %d\n", port);
186 panic("floppy: Port bolixed.");
188 sun_set_dor(value, 1);
190 case 5: /* FD_DATA */
191 sun_fdc->data_82077 = value;
194 sun_fdc->dcr_82077 = value;
196 case 4: /* FD_STATUS */
197 sun_fdc->status_82077 = value;
200 sun_fdc->tapectl_82077 = value;
206 /* For pseudo-dma (Sun floppy drives have no real DMA available to
207 * them so we must eat the data fifo bytes directly ourselves) we have
208 * three state variables. doing_pdma tells our inline low-level
209 * assembly floppy interrupt entry point whether it should sit and eat
210 * bytes from the fifo or just transfer control up to the higher level
211 * floppy interrupt c-code. I tried very hard but I could not get the
212 * pseudo-dma to work in c-code without getting many overruns and
213 * underruns. If non-zero, doing_pdma encodes the direction of
214 * the transfer for debugging. 1=read 2=write
217 /* Common routines to all controller types on the Sparc. */
218 static inline void virtual_dma_init(void)
223 static inline void sun_fd_disable_dma(void)
229 static inline void sun_fd_set_dma_mode(int mode)
239 printk("Unknown dma mode %d\n", mode);
240 panic("floppy: Giving up...");
244 static inline void sun_fd_set_dma_addr(char *buffer)
249 static inline void sun_fd_set_dma_count(int length)
254 static inline void sun_fd_enable_dma(void)
256 pdma_base = pdma_vaddr;
257 pdma_areasize = pdma_size;
260 int sparc_floppy_request_irq(unsigned int irq, irq_handler_t irq_handler);
262 static int sun_fd_request_irq(void)
268 return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
274 static struct linux_prom_registers fd_regs[2];
276 static int sun_floppy_init(void)
278 struct platform_device *op;
279 struct device_node *dp;
288 /* Forget it if we aren't on a machine that could possibly
289 * ever have a floppy drive.
291 if (sparc_cpu_model != sun4m) {
292 /* We certainly don't have a floppy controller. */
295 /* Well, try to find one. */
296 tnode = prom_getchild(prom_root_node);
297 fd_node = prom_searchsiblings(tnode, "obio");
299 tnode = prom_getchild(fd_node);
300 fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
302 fd_node = prom_searchsiblings(tnode, "fd");
308 /* The sun4m lets us know if the controller is actually usable. */
309 if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
310 if(!strcmp(state, "disabled")) {
314 num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
315 num_regs = (num_regs / sizeof(fd_regs[0]));
316 prom_apply_obio_ranges(fd_regs, num_regs);
317 memset(&r, 0, sizeof(r));
318 r.flags = fd_regs[0].which_io;
319 r.start = fd_regs[0].phys_addr;
320 sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");
322 /* Look up irq in platform_device.
323 * We try "SUNW,fdtwo" and "fd"
326 for_each_node_by_name(dp, "SUNW,fdtwo") {
327 op = of_find_device_by_node(dp);
332 for_each_node_by_name(dp, "fd") {
333 op = of_find_device_by_node(dp);
341 FLOPPY_IRQ = op->archdata.irqs[0];
343 /* Last minute sanity check... */
344 if (sun_fdc->status_82072 == 0xff) {
349 sun_fdops.fd_inb = sun_82077_fd_inb;
350 sun_fdops.fd_outb = sun_82077_fd_outb;
351 fdc_status = &sun_fdc->status_82077;
353 if (sun_fdc->dor_82077 == 0x80) {
354 sun_fdc->dor_82077 = 0x02;
355 if (sun_fdc->dor_82077 == 0x80) {
356 sun_fdops.fd_inb = sun_82072_fd_inb;
357 sun_fdops.fd_outb = sun_82072_fd_outb;
358 fdc_status = &sun_fdc->status_82072;
363 allowed_drive_mask = 0x01;
364 return (int) sun_fdc;
370 static int sparc_eject(void)
372 set_dor(0x00, 0xff, 0x90);
374 set_dor(0x00, 0x6f, 0x00);
379 #define fd_eject(drive) sparc_eject()
381 #define EXTRA_FLOPPY_PARAMS
383 static DEFINE_SPINLOCK(dma_spin_lock);
385 #define claim_dma_lock() \
386 ({ unsigned long flags; \
387 spin_lock_irqsave(&dma_spin_lock, flags); \
391 #define release_dma_lock(__flags) \
392 spin_unlock_irqrestore(&dma_spin_lock, __flags);
394 #endif /* !(__ASM_SPARC_FLOPPY_H) */