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