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Diffstat (limited to 'include/asm-i386/floppy.h')
| -rw-r--r-- | include/asm-i386/floppy.h | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/include/asm-i386/floppy.h b/include/asm-i386/floppy.h new file mode 100644 index 000000000000..f4782284807a --- /dev/null +++ b/include/asm-i386/floppy.h @@ -0,0 +1,319 @@ +/* + * Architecture specific parts of the Floppy driver + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1995 + */ +#ifndef __ASM_I386_FLOPPY_H +#define __ASM_I386_FLOPPY_H + +#include <linux/vmalloc.h> + + +/* + * The DMA channel used by the floppy controller cannot access data at + * addresses >= 16MB + * + * Went back to the 1MB limit, as some people had problems with the floppy + * driver otherwise. It doesn't matter much for performance anyway, as most + * floppy accesses go through the track buffer. + */ +#define _CROSS_64KB(a,s,vdma) \ +(!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)) + +#define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1) + + +#define SW fd_routine[use_virtual_dma&1] +#define CSW fd_routine[can_use_virtual_dma & 1] + + +#define fd_inb(port) inb_p(port) +#define fd_outb(value,port) outb_p(value,port) + +#define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy") +#define fd_free_dma() CSW._free_dma(FLOPPY_DMA) +#define fd_enable_irq() enable_irq(FLOPPY_IRQ) +#define fd_disable_irq() disable_irq(FLOPPY_IRQ) +#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL) +#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA) +#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size) +#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io) + +#define FLOPPY_CAN_FALLBACK_ON_NODMA + +static int virtual_dma_count; +static int virtual_dma_residue; +static char *virtual_dma_addr; +static int virtual_dma_mode; +static int doing_pdma; + +static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) +{ + register unsigned char st; + +#undef TRACE_FLPY_INT +#define NO_FLOPPY_ASSEMBLER + +#ifdef TRACE_FLPY_INT + static int calls=0; + static int bytes=0; + static int dma_wait=0; +#endif + if (!doing_pdma) + return floppy_interrupt(irq, dev_id, regs); + +#ifdef TRACE_FLPY_INT + if(!calls) + bytes = virtual_dma_count; +#endif + +#ifndef NO_FLOPPY_ASSEMBLER + __asm__ ( + "testl %1,%1" + "je 3f" +"1: inb %w4,%b0" + "andb $160,%b0" + "cmpb $160,%b0" + "jne 2f" + "incw %w4" + "testl %3,%3" + "jne 4f" + "inb %w4,%b0" + "movb %0,(%2)" + "jmp 5f" +"4: movb (%2),%0" + "outb %b0,%w4" +"5: decw %w4" + "outb %0,$0x80" + "decl %1" + "incl %2" + "testl %1,%1" + "jne 1b" +"3: inb %w4,%b0" +"2: " + : "=a" ((char) st), + "=c" ((long) virtual_dma_count), + "=S" ((long) virtual_dma_addr) + : "b" ((long) virtual_dma_mode), + "d" ((short) virtual_dma_port+4), + "1" ((long) virtual_dma_count), + "2" ((long) virtual_dma_addr)); +#else + { + register int lcount; + register char *lptr; + + st = 1; + for(lcount=virtual_dma_count, lptr=virtual_dma_addr; + lcount; lcount--, lptr++) { + st=inb(virtual_dma_port+4) & 0xa0 ; + if(st != 0xa0) + break; + if(virtual_dma_mode) + outb_p(*lptr, virtual_dma_port+5); + else + *lptr = inb_p(virtual_dma_port+5); + } + virtual_dma_count = lcount; + virtual_dma_addr = lptr; + st = inb(virtual_dma_port+4); + } +#endif + +#ifdef TRACE_FLPY_INT + calls++; +#endif + if(st == 0x20) + return IRQ_HANDLED; + if(!(st & 0x20)) { + virtual_dma_residue += virtual_dma_count; + virtual_dma_count=0; +#ifdef TRACE_FLPY_INT + printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", + virtual_dma_count, virtual_dma_residue, calls, bytes, + dma_wait); + calls = 0; + dma_wait=0; +#endif + doing_pdma = 0; + floppy_interrupt(irq, dev_id, regs); + return IRQ_HANDLED; + } +#ifdef TRACE_FLPY_INT + if(!virtual_dma_count) + dma_wait++; +#endif + return IRQ_HANDLED; +} + +static void fd_disable_dma(void) +{ + if(! (can_use_virtual_dma & 1)) + disable_dma(FLOPPY_DMA); + doing_pdma = 0; + virtual_dma_residue += virtual_dma_count; + virtual_dma_count=0; +} + +static int vdma_request_dma(unsigned int dmanr, const char * device_id) +{ + return 0; +} + +static void vdma_nop(unsigned int dummy) +{ +} + + +static int vdma_get_dma_residue(unsigned int dummy) +{ + return virtual_dma_count + virtual_dma_residue; +} + + +static int fd_request_irq(void) +{ + if(can_use_virtual_dma) + return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, + "floppy", NULL); + else + return request_irq(FLOPPY_IRQ, floppy_interrupt, + SA_INTERRUPT|SA_SAMPLE_RANDOM, + "floppy", NULL); + +} + +static unsigned long dma_mem_alloc(unsigned long size) +{ + return __get_dma_pages(GFP_KERNEL,get_order(size)); +} + + +static unsigned long vdma_mem_alloc(unsigned long size) +{ + return (unsigned long) vmalloc(size); + +} + +#define nodma_mem_alloc(size) vdma_mem_alloc(size) + +static void _fd_dma_mem_free(unsigned long addr, unsigned long size) +{ + if((unsigned int) addr >= (unsigned int) high_memory) + vfree((void *)addr); + else + free_pages(addr, get_order(size)); +} + +#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size) + +static void _fd_chose_dma_mode(char *addr, unsigned long size) +{ + if(can_use_virtual_dma == 2) { + if((unsigned int) addr >= (unsigned int) high_memory || + isa_virt_to_bus(addr) >= 0x1000000 || + _CROSS_64KB(addr, size, 0)) + use_virtual_dma = 1; + else + use_virtual_dma = 0; + } else { + use_virtual_dma = can_use_virtual_dma & 1; + } +} + +#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size) + + +static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) +{ + doing_pdma = 1; + virtual_dma_port = io; + virtual_dma_mode = (mode == DMA_MODE_WRITE); + virtual_dma_addr = addr; + virtual_dma_count = size; + virtual_dma_residue = 0; + return 0; +} + +static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) +{ +#ifdef FLOPPY_SANITY_CHECK + if (CROSS_64KB(addr, size)) { + printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size); + return -1; + } +#endif + /* actual, physical DMA */ + doing_pdma = 0; + clear_dma_ff(FLOPPY_DMA); + set_dma_mode(FLOPPY_DMA,mode); + set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr)); + set_dma_count(FLOPPY_DMA,size); + enable_dma(FLOPPY_DMA); + return 0; +} + +struct fd_routine_l { + int (*_request_dma)(unsigned int dmanr, const char * device_id); + void (*_free_dma)(unsigned int dmanr); + int (*_get_dma_residue)(unsigned int dummy); + unsigned long (*_dma_mem_alloc) (unsigned long size); + int (*_dma_setup)(char *addr, unsigned long size, int mode, int io); +} fd_routine[] = { + { + request_dma, + free_dma, + get_dma_residue, + dma_mem_alloc, + hard_dma_setup + }, + { + vdma_request_dma, + vdma_nop, + vdma_get_dma_residue, + vdma_mem_alloc, + vdma_dma_setup + } +}; + + +static int FDC1 = 0x3f0; +static int FDC2 = -1; + +/* + * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock + * is needed to prevent corrupted CMOS RAM in case "insmod floppy" + * coincides with another rtc CMOS user. Paul G. + */ +#define FLOPPY0_TYPE ({ \ + unsigned long flags; \ + unsigned char val; \ + spin_lock_irqsave(&rtc_lock, flags); \ + val = (CMOS_READ(0x10) >> 4) & 15; \ + spin_unlock_irqrestore(&rtc_lock, flags); \ + val; \ +}) + +#define FLOPPY1_TYPE ({ \ + unsigned long flags; \ + unsigned char val; \ + spin_lock_irqsave(&rtc_lock, flags); \ + val = CMOS_READ(0x10) & 15; \ + spin_unlock_irqrestore(&rtc_lock, flags); \ + val; \ +}) + +#define N_FDC 2 +#define N_DRIVE 8 + +#define FLOPPY_MOTOR_MASK 0xf0 + +#define AUTO_DMA + +#define EXTRA_FLOPPY_PARAMS + +#endif /* __ASM_I386_FLOPPY_H */ |
