--- /dev/null
+/*
+ * 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
+ *
+ * Modifications for Xen are Copyright (c) 2004, Keir Fraser.
+ */
+#ifndef __ASM_XEN_X86_64_FLOPPY_H
+#define __ASM_XEN_X86_64_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))
+
+/* XEN: Hit DMA paths on the head. This trick from asm-m68k/floppy.h. */
+#include <asm/dma.h>
+#undef MAX_DMA_ADDRESS
+#define MAX_DMA_ADDRESS 0
+#define CROSS_64KB(a,s) (0)
+
+#define fd_inb(port) inb_p(port)
+#define fd_outb(value,port) outb_p(value,port)
+
+#define fd_request_dma() (0)
+#define fd_free_dma() ((void)0)
+#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() vdma_get_dma_residue(FLOPPY_DMA)
+/*
+ * Do not use vmalloc/vfree: floppy_release_irq_and_dma() gets called from
+ * softirq context via motor_off_callback. A generic bug we happen to trigger.
+ */
+#define fd_dma_mem_alloc(size) __get_free_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size))
+#define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
+#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
+
+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, struct pt_regs * regs)
+{
+ register unsigned char st;
+
+#undef TRACE_FLPY_INT
+
+#ifdef TRACE_FLPY_INT
+ static int calls=0;
+ static int bytes=0;
+ static int dma_wait=0;
+#endif
+ if (!doing_pdma)
+ return floppy_interrupt(irq, dev_id, regs);
+
+#ifdef TRACE_FLPY_INT
+ if(!calls)
+ bytes = virtual_dma_count;
+#endif
+
+ {
+ register int lcount;
+ register 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, regs);
+ return IRQ_HANDLED;
+ }
+#ifdef TRACE_FLPY_INT
+ if(!virtual_dma_count)
+ dma_wait++;
+#endif
+ return IRQ_HANDLED;
+}
+
+static void fd_disable_dma(void)
+{
+ doing_pdma = 0;
+ virtual_dma_residue += virtual_dma_count;
+ virtual_dma_count=0;
+}
+
+static int vdma_get_dma_residue(unsigned int dummy)
+{
+ return virtual_dma_count + virtual_dma_residue;
+}
+
+
+static int fd_request_irq(void)
+{
+ return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
+ "floppy", NULL);
+}
+
+#if 0
+static unsigned long vdma_mem_alloc(unsigned long size)
+{
+ return (unsigned long) vmalloc(size);
+
+}
+
+static void vdma_mem_free(unsigned long addr, unsigned long size)
+{
+ vfree((void *)addr);
+}
+#endif
+
+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;
+}
+
+/* XEN: This trick to force 'virtual DMA' is from include/asm-m68k/floppy.h. */
+#define FDC1 xen_floppy_init()
+static int FDC2 = -1;
+
+static int xen_floppy_init(void)
+{
+ use_virtual_dma = 1;
+ can_use_virtual_dma = 1;
+ return 0x3f0;
+}
+
+/*
+ * 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 FLOPPY_MOTOR_MASK 0xf0
+
+#define EXTRA_FLOPPY_PARAMS
+
+#endif /* __ASM_XEN_X86_64_FLOPPY_H */
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