260 lines
5.2 KiB
C
260 lines
5.2 KiB
C
/*
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* Implementation independent bits of the Floppy driver.
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*
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* much of this file is derived from what was originally the Q40 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) 1999, 2000, 2001
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*
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* Sun3x support added 2/4/2000 Sam Creasey (sammy@sammy.net)
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*
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*/
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#include <asm/io.h>
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#include <linux/vmalloc.h>
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asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id,
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struct pt_regs *regs);
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/* constants... */
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#undef MAX_DMA_ADDRESS
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#define MAX_DMA_ADDRESS 0x00 /* nothing like that */
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/*
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* Again, the CMOS information doesn't work on m68k..
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*/
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#define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4)
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#define FLOPPY1_TYPE 0
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#define FLOPPY_MOTOR_MASK 0xf0
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/* basically PC init + set use_virtual_dma */
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#define FDC1 m68k_floppy_init()
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#define N_FDC 1
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#define N_DRIVE 8
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/* vdma globals adapted from asm-i386/floppy.h */
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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=NULL;
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static int virtual_dma_mode=0;
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static int doing_pdma=0;
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#include <asm/sun3xflop.h>
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extern spinlock_t dma_spin_lock;
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static __inline__ unsigned long claim_dma_lock(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&dma_spin_lock, flags);
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return flags;
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}
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static __inline__ void release_dma_lock(unsigned long flags)
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{
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spin_unlock_irqrestore(&dma_spin_lock, flags);
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}
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static __inline__ unsigned char fd_inb(int port)
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{
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if(MACH_IS_Q40)
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return inb_p(port);
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else if(MACH_IS_SUN3X)
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return sun3x_82072_fd_inb(port);
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return 0;
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}
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static __inline__ void fd_outb(unsigned char value, int port)
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{
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if(MACH_IS_Q40)
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outb_p(value, port);
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else if(MACH_IS_SUN3X)
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sun3x_82072_fd_outb(value, port);
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}
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static int fd_request_irq(void)
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{
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if(MACH_IS_Q40)
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return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
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"floppy", floppy_hardint);
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else if(MACH_IS_SUN3X)
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return sun3xflop_request_irq();
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return -ENXIO;
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}
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static void fd_free_irq(void)
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{
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if(MACH_IS_Q40)
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free_irq(FLOPPY_IRQ, floppy_hardint);
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}
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#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy")
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#define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA)
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#define fd_dma_mem_alloc(size) vdma_mem_alloc(size)
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#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
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#define fd_enable_irq() /* nothing... */
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#define fd_disable_irq() /* nothing... */
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#define fd_free_dma() /* nothing */
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/* No 64k boundary crossing problems on Q40 - no DMA at all */
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#define CROSS_64KB(a,s) (0)
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#define DMA_MODE_READ 0x44 /* i386 look-alike */
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#define DMA_MODE_WRITE 0x48
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static int m68k_floppy_init(void)
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{
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use_virtual_dma =1;
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can_use_virtual_dma = 1;
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if (MACH_IS_Q40)
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return 0x3f0;
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else if(MACH_IS_SUN3X)
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return sun3xflop_init();
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else
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return -1;
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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 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 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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static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
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{
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vfree((void *)addr);
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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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/* choose_dma_mode ???*/
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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 = (MACH_IS_Q40 ? io : 0);
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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 void fd_disable_dma(void)
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{
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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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/* this is the only truly Q40 specific function */
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asmlinkage irqreturn_t floppy_hardint(int irq, void *dev_id,
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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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#define NO_FLOPPY_ASSEMBLER
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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 IRQ_HANDLED;
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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;
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/* serve 1st byte fast: */
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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, regs);
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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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#define EXTRA_FLOPPY_PARAMS
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