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_64_FLOPPY_H
11 #define __ASM_X86_64_FLOPPY_H
13 #include <linux/vmalloc.h>
17 * The DMA channel used by the floppy controller cannot access data at
20 * Went back to the 1MB limit, as some people had problems with the floppy
21 * driver otherwise. It doesn't matter much for performance anyway, as most
22 * floppy accesses go through the track buffer.
24 #define _CROSS_64KB(a,s,vdma) \
25 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
27 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
30 #define SW fd_routine[use_virtual_dma&1]
31 #define CSW fd_routine[can_use_virtual_dma & 1]
34 #define fd_inb(port) inb_p(port)
35 #define fd_outb(port,value) outb_p(port,value)
37 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
38 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
39 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
40 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
41 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
42 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
43 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
44 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
46 #define FLOPPY_CAN_FALLBACK_ON_NODMA
48 static int virtual_dma_count;
49 static int virtual_dma_residue;
50 static char *virtual_dma_addr;
51 static int virtual_dma_mode;
52 static int doing_pdma;
54 static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
56 register unsigned char st;
63 static int dma_wait=0;
66 floppy_interrupt(irq, dev_id, regs);
72 bytes = virtual_dma_count;
80 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
81 lcount; lcount--, lptr++) {
82 st=inb(virtual_dma_port+4) & 0xa0 ;
86 outb_p(*lptr, virtual_dma_port+5);
88 *lptr = inb_p(virtual_dma_port+5);
90 virtual_dma_count = lcount;
91 virtual_dma_addr = lptr;
92 st = inb(virtual_dma_port+4);
101 virtual_dma_residue += virtual_dma_count;
103 #ifdef TRACE_FLPY_INT
104 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
105 virtual_dma_count, virtual_dma_residue, calls, bytes,
111 floppy_interrupt(irq, dev_id, regs);
114 #ifdef TRACE_FLPY_INT
115 if(!virtual_dma_count)
120 static void fd_disable_dma(void)
122 if(! (can_use_virtual_dma & 1))
123 disable_dma(FLOPPY_DMA);
125 virtual_dma_residue += virtual_dma_count;
129 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
134 static void vdma_nop(unsigned int dummy)
139 static int vdma_get_dma_residue(unsigned int dummy)
141 return virtual_dma_count + virtual_dma_residue;
145 static int fd_request_irq(void)
147 if(can_use_virtual_dma)
148 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
151 return request_irq(FLOPPY_IRQ, floppy_interrupt,
152 SA_INTERRUPT|SA_SAMPLE_RANDOM,
157 static unsigned long dma_mem_alloc(unsigned long size)
159 return __get_dma_pages(GFP_KERNEL,get_order(size));
163 static unsigned long vdma_mem_alloc(unsigned long size)
165 return (unsigned long) vmalloc(size);
169 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
171 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
173 if((unsigned long) addr >= (unsigned long) high_memory)
174 return vfree((void *)addr);
176 free_pages(addr, get_order(size));
179 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
181 static void _fd_chose_dma_mode(char *addr, unsigned long size)
183 if(can_use_virtual_dma == 2) {
184 if((unsigned long) addr >= (unsigned long) high_memory ||
185 virt_to_bus(addr) >= 0x1000000 ||
186 _CROSS_64KB(addr, size, 0))
191 use_virtual_dma = can_use_virtual_dma & 1;
195 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
198 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
201 virtual_dma_port = io;
202 virtual_dma_mode = (mode == DMA_MODE_WRITE);
203 virtual_dma_addr = addr;
204 virtual_dma_count = size;
205 virtual_dma_residue = 0;
209 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
211 #ifdef FLOPPY_SANITY_CHECK
212 if (CROSS_64KB(addr, size)) {
213 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
217 /* actual, physical DMA */
219 clear_dma_ff(FLOPPY_DMA);
220 set_dma_mode(FLOPPY_DMA,mode);
221 set_dma_addr(FLOPPY_DMA,virt_to_bus(addr));
222 set_dma_count(FLOPPY_DMA,size);
223 enable_dma(FLOPPY_DMA);
227 struct fd_routine_l {
228 int (*_request_dma)(unsigned int dmanr, const char * device_id);
229 void (*_free_dma)(unsigned int dmanr);
230 int (*_get_dma_residue)(unsigned int dummy);
231 unsigned long (*_dma_mem_alloc) (unsigned long size);
232 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
244 vdma_get_dma_residue,
251 static int FDC1 = 0x3f0;
252 static int FDC2 = -1;
255 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
256 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
257 * coincides with another rtc CMOS user. Paul G.
259 #define FLOPPY0_TYPE ({ \
260 unsigned long flags; \
262 spin_lock_irqsave(&rtc_lock, flags); \
263 val = (CMOS_READ(0x10) >> 4) & 15; \
264 spin_unlock_irqrestore(&rtc_lock, flags); \
268 #define FLOPPY1_TYPE ({ \
269 unsigned long flags; \
271 spin_lock_irqsave(&rtc_lock, flags); \
272 val = CMOS_READ(0x10) & 15; \
273 spin_unlock_irqrestore(&rtc_lock, flags); \
280 #define FLOPPY_MOTOR_MASK 0xf0
284 #define EXTRA_FLOPPY_PARAMS
286 #endif /* __ASM_X86_64_FLOPPY_H */