272 lines
6.6 KiB
C
272 lines
6.6 KiB
C
/* Architecture specific parts of the Floppy driver
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*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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* Copyright (C) 2000 Matthew Wilcox (willy a debian . org)
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* Copyright (C) 2000 Dave Kennedy
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __ASM_PARISC_FLOPPY_H
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#define __ASM_PARISC_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 && ((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) readb(port)
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#define fd_outb(value, port) writeb(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=0;
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static int virtual_dma_residue=0;
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static char *virtual_dma_addr=0;
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static int virtual_dma_mode=0;
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static int doing_pdma=0;
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static void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
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{
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register 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=0;
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static int bytes=0;
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static int dma_wait=0;
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#endif
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if (!doing_pdma) {
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floppy_interrupt(irq, dev_id, regs);
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return;
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}
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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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register int lcount;
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register char *lptr = virtual_dma_addr;
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for (lcount = virtual_dma_count; lcount; lcount--) {
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st = fd_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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fd_outb(*lptr, virtual_dma_port+5);
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} else {
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*lptr = fd_inb(virtual_dma_port+5);
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}
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lptr++;
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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 = fd_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;
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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, regs);
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return;
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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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}
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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, 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 int) addr >= (unsigned int) high_memory)
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return 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 int) addr >= (unsigned int) high_memory ||
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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,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; /* Lies. Floppy controller is memory mapped, not io mapped */
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static int FDC2 = -1;
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#define FLOPPY0_TYPE 0
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#define FLOPPY1_TYPE 0
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#define N_FDC 1
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#define N_DRIVE 8
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#define EXTRA_FLOPPY_PARAMS
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#endif /* __ASM_PARISC_FLOPPY_H */
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