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Diffstat (limited to 'arch/x86/include/asm/floppy.h')
| -rw-r--r-- | arch/x86/include/asm/floppy.h | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/arch/x86/include/asm/floppy.h b/arch/x86/include/asm/floppy.h new file mode 100644 index 00000000000..7d83a3a83e3 --- /dev/null +++ b/arch/x86/include/asm/floppy.h @@ -0,0 +1,281 @@ +/* + * 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_X86__FLOPPY_H +#define ASM_X86__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) +{ + unsigned char st; + +#undef TRACE_FLPY_INT + +#ifdef TRACE_FLPY_INT + static int calls; + static int bytes; + static int dma_wait; +#endif + if (!doing_pdma) + return floppy_interrupt(irq, dev_id); + +#ifdef TRACE_FLPY_INT + if (!calls) + bytes = virtual_dma_count; +#endif + + { + int lcount; + 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); + } + +#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); + 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, + IRQF_DISABLED, "floppy", NULL); + else + return request_irq(FLOPPY_IRQ, floppy_interrupt, + IRQF_DISABLED, "floppy", NULL); +} + +static unsigned long dma_mem_alloc(unsigned long size) +{ + return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, 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 long)addr >= (unsigned long)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 long)addr >= (unsigned long)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; +} + +static 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 EXTRA_FLOPPY_PARAMS + +#endif /* ASM_X86__FLOPPY_H */ |