282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
/*
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* Architecture specific parts of the Floppy driver
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995
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*/
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#ifndef _ASM_X86_FLOPPY_H
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#define _ASM_X86_FLOPPY_H
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#include <linux/vmalloc.h>
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/*
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* The DMA channel used by the floppy controller cannot access data at
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* addresses >= 16MB
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*
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* Went back to the 1MB limit, as some people had problems with the floppy
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* driver otherwise. It doesn't matter much for performance anyway, as most
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* floppy accesses go through the track buffer.
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*/
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#define _CROSS_64KB(a, s, vdma) \
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(!(vdma) && \
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((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
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#define CROSS_64KB(a, s) _CROSS_64KB(a, s, use_virtual_dma & 1)
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#define SW fd_routine[use_virtual_dma & 1]
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#define CSW fd_routine[can_use_virtual_dma & 1]
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#define fd_inb(port) inb_p(port)
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#define fd_outb(value, port) outb_p(value, port)
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#define fd_request_dma() CSW._request_dma(FLOPPY_DMA, "floppy")
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#define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
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#define fd_enable_irq() enable_irq(FLOPPY_IRQ)
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#define fd_disable_irq() disable_irq(FLOPPY_IRQ)
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#define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
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#define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
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#define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
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#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
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#define FLOPPY_CAN_FALLBACK_ON_NODMA
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static int virtual_dma_count;
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static int virtual_dma_residue;
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static char *virtual_dma_addr;
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static int virtual_dma_mode;
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static int doing_pdma;
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static irqreturn_t floppy_hardint(int irq, void *dev_id)
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{
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unsigned char st;
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#undef TRACE_FLPY_INT
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#ifdef TRACE_FLPY_INT
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static int calls;
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static int bytes;
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static int dma_wait;
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#endif
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if (!doing_pdma)
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return floppy_interrupt(irq, dev_id);
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#ifdef TRACE_FLPY_INT
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if (!calls)
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bytes = virtual_dma_count;
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#endif
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{
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int lcount;
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char *lptr;
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st = 1;
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for (lcount = virtual_dma_count, lptr = virtual_dma_addr;
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lcount; lcount--, lptr++) {
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st = inb(virtual_dma_port + 4) & 0xa0;
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if (st != 0xa0)
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break;
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if (virtual_dma_mode)
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outb_p(*lptr, virtual_dma_port + 5);
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else
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*lptr = inb_p(virtual_dma_port + 5);
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}
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virtual_dma_count = lcount;
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virtual_dma_addr = lptr;
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st = inb(virtual_dma_port + 4);
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}
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#ifdef TRACE_FLPY_INT
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calls++;
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#endif
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if (st == 0x20)
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return IRQ_HANDLED;
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if (!(st & 0x20)) {
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virtual_dma_residue += virtual_dma_count;
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virtual_dma_count = 0;
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#ifdef TRACE_FLPY_INT
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printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
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virtual_dma_count, virtual_dma_residue, calls, bytes,
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dma_wait);
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calls = 0;
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dma_wait = 0;
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#endif
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doing_pdma = 0;
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floppy_interrupt(irq, dev_id);
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return IRQ_HANDLED;
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}
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#ifdef TRACE_FLPY_INT
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if (!virtual_dma_count)
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dma_wait++;
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#endif
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return IRQ_HANDLED;
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}
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static void fd_disable_dma(void)
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{
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if (!(can_use_virtual_dma & 1))
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disable_dma(FLOPPY_DMA);
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doing_pdma = 0;
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virtual_dma_residue += virtual_dma_count;
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virtual_dma_count = 0;
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}
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static int vdma_request_dma(unsigned int dmanr, const char *device_id)
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{
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return 0;
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}
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static void vdma_nop(unsigned int dummy)
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{
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}
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static int vdma_get_dma_residue(unsigned int dummy)
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{
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return virtual_dma_count + virtual_dma_residue;
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}
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static int fd_request_irq(void)
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{
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if (can_use_virtual_dma)
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return request_irq(FLOPPY_IRQ, floppy_hardint,
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IRQF_DISABLED, "floppy", NULL);
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else
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return request_irq(FLOPPY_IRQ, floppy_interrupt,
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IRQF_DISABLED, "floppy", NULL);
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}
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static unsigned long dma_mem_alloc(unsigned long size)
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{
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return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size));
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}
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static unsigned long vdma_mem_alloc(unsigned long size)
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{
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return (unsigned long)vmalloc(size);
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}
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#define nodma_mem_alloc(size) vdma_mem_alloc(size)
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static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
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{
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if ((unsigned long)addr >= (unsigned long)high_memory)
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vfree((void *)addr);
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else
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free_pages(addr, get_order(size));
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}
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#define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
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static void _fd_chose_dma_mode(char *addr, unsigned long size)
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{
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if (can_use_virtual_dma == 2) {
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if ((unsigned long)addr >= (unsigned long)high_memory ||
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isa_virt_to_bus(addr) >= 0x1000000 ||
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_CROSS_64KB(addr, size, 0))
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use_virtual_dma = 1;
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else
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use_virtual_dma = 0;
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} else {
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use_virtual_dma = can_use_virtual_dma & 1;
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}
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}
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#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
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static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
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{
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doing_pdma = 1;
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virtual_dma_port = io;
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virtual_dma_mode = (mode == DMA_MODE_WRITE);
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virtual_dma_addr = addr;
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virtual_dma_count = size;
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virtual_dma_residue = 0;
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return 0;
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}
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static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
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{
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#ifdef FLOPPY_SANITY_CHECK
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if (CROSS_64KB(addr, size)) {
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printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
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return -1;
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}
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#endif
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/* actual, physical DMA */
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doing_pdma = 0;
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clear_dma_ff(FLOPPY_DMA);
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set_dma_mode(FLOPPY_DMA, mode);
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set_dma_addr(FLOPPY_DMA, isa_virt_to_bus(addr));
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set_dma_count(FLOPPY_DMA, size);
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enable_dma(FLOPPY_DMA);
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return 0;
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}
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static struct fd_routine_l {
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int (*_request_dma)(unsigned int dmanr, const char *device_id);
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void (*_free_dma)(unsigned int dmanr);
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int (*_get_dma_residue)(unsigned int dummy);
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unsigned long (*_dma_mem_alloc)(unsigned long size);
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int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
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} fd_routine[] = {
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{
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request_dma,
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free_dma,
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get_dma_residue,
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dma_mem_alloc,
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hard_dma_setup
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},
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{
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vdma_request_dma,
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vdma_nop,
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vdma_get_dma_residue,
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vdma_mem_alloc,
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vdma_dma_setup
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}
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};
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static int FDC1 = 0x3f0;
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static int FDC2 = -1;
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/*
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* Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
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* is needed to prevent corrupted CMOS RAM in case "insmod floppy"
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* coincides with another rtc CMOS user. Paul G.
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*/
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#define FLOPPY0_TYPE \
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({ \
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unsigned long flags; \
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unsigned char val; \
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spin_lock_irqsave(&rtc_lock, flags); \
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val = (CMOS_READ(0x10) >> 4) & 15; \
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spin_unlock_irqrestore(&rtc_lock, flags); \
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val; \
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})
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#define FLOPPY1_TYPE \
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({ \
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unsigned long flags; \
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unsigned char val; \
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spin_lock_irqsave(&rtc_lock, flags); \
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val = CMOS_READ(0x10) & 15; \
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spin_unlock_irqrestore(&rtc_lock, flags); \
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val; \
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})
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#define N_FDC 2
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#define N_DRIVE 8
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#define EXTRA_FLOPPY_PARAMS
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#endif /* _ASM_X86_FLOPPY_H */
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