2 * Architecture specific parts of the Floppy driver
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
10 #ifndef _ASM_X86_FLOPPY_H
11 #define _ASM_X86_FLOPPY_H
13 #include <linux/vmalloc.h>
16 * The DMA channel used by the floppy controller cannot access data at
19 * Went back to the 1MB limit, as some people had problems with the floppy
20 * driver otherwise. It doesn't matter much for performance anyway, as most
21 * floppy accesses go through the track buffer.
23 #define _CROSS_64KB(a,s,vdma) \
24 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
26 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
29 #define SW fd_routine[use_virtual_dma&1]
30 #define CSW fd_routine[can_use_virtual_dma & 1]
33 #define fd_inb(port) inb_p(port)
34 #define fd_outb(value,port) outb_p(value,port)
36 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
37 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
38 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
39 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
40 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
41 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
42 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
43 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
45 #define FLOPPY_CAN_FALLBACK_ON_NODMA
47 static int virtual_dma_count;
48 static int virtual_dma_residue;
49 static char *virtual_dma_addr;
50 static int virtual_dma_mode;
51 static int doing_pdma;
53 static irqreturn_t floppy_hardint(int irq, void *dev_id)
55 register unsigned char st;
62 static int dma_wait=0;
65 return floppy_interrupt(irq, dev_id);
69 bytes = virtual_dma_count;
77 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
78 lcount; lcount--, lptr++) {
79 st=inb(virtual_dma_port+4) & 0xa0 ;
83 outb_p(*lptr, virtual_dma_port+5);
85 *lptr = inb_p(virtual_dma_port+5);
87 virtual_dma_count = lcount;
88 virtual_dma_addr = lptr;
89 st = inb(virtual_dma_port+4);
98 virtual_dma_residue += virtual_dma_count;
100 #ifdef TRACE_FLPY_INT
101 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
102 virtual_dma_count, virtual_dma_residue, calls, bytes,
108 floppy_interrupt(irq, dev_id);
111 #ifdef TRACE_FLPY_INT
112 if(!virtual_dma_count)
118 static void fd_disable_dma(void)
120 if(! (can_use_virtual_dma & 1))
121 disable_dma(FLOPPY_DMA);
123 virtual_dma_residue += virtual_dma_count;
127 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
132 static void vdma_nop(unsigned int dummy)
137 static int vdma_get_dma_residue(unsigned int dummy)
139 return virtual_dma_count + virtual_dma_residue;
143 static int fd_request_irq(void)
145 if(can_use_virtual_dma)
146 return request_irq(FLOPPY_IRQ, floppy_hardint,
147 IRQF_DISABLED, "floppy", NULL);
149 return request_irq(FLOPPY_IRQ, floppy_interrupt,
150 IRQF_DISABLED, "floppy", NULL);
153 static unsigned long dma_mem_alloc(unsigned long size)
155 return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY,get_order(size));
159 static unsigned long vdma_mem_alloc(unsigned long size)
161 return (unsigned long) vmalloc(size);
165 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
167 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
169 if((unsigned long) addr >= (unsigned long) high_memory)
172 free_pages(addr, get_order(size));
175 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
177 static void _fd_chose_dma_mode(char *addr, unsigned long size)
179 if(can_use_virtual_dma == 2) {
180 if((unsigned long) addr >= (unsigned long) high_memory ||
181 isa_virt_to_bus(addr) >= 0x1000000 ||
182 _CROSS_64KB(addr, size, 0))
187 use_virtual_dma = can_use_virtual_dma & 1;
191 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
194 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
197 virtual_dma_port = io;
198 virtual_dma_mode = (mode == DMA_MODE_WRITE);
199 virtual_dma_addr = addr;
200 virtual_dma_count = size;
201 virtual_dma_residue = 0;
205 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
207 #ifdef FLOPPY_SANITY_CHECK
208 if (CROSS_64KB(addr, size)) {
209 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
213 /* actual, physical DMA */
215 clear_dma_ff(FLOPPY_DMA);
216 set_dma_mode(FLOPPY_DMA,mode);
217 set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
218 set_dma_count(FLOPPY_DMA,size);
219 enable_dma(FLOPPY_DMA);
223 static struct fd_routine_l {
224 int (*_request_dma)(unsigned int dmanr, const char * device_id);
225 void (*_free_dma)(unsigned int dmanr);
226 int (*_get_dma_residue)(unsigned int dummy);
227 unsigned long (*_dma_mem_alloc) (unsigned long size);
228 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
240 vdma_get_dma_residue,
247 static int FDC1 = 0x3f0;
248 static int FDC2 = -1;
251 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
252 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
253 * coincides with another rtc CMOS user. Paul G.
255 #define FLOPPY0_TYPE ({ \
256 unsigned long flags; \
258 spin_lock_irqsave(&rtc_lock, flags); \
259 val = (CMOS_READ(0x10) >> 4) & 15; \
260 spin_unlock_irqrestore(&rtc_lock, flags); \
264 #define FLOPPY1_TYPE ({ \
265 unsigned long flags; \
267 spin_lock_irqsave(&rtc_lock, flags); \
268 val = CMOS_READ(0x10) & 15; \
269 spin_unlock_irqrestore(&rtc_lock, flags); \
276 #define EXTRA_FLOPPY_PARAMS
278 #endif /* _ASM_X86_FLOPPY_H */