This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-i386 / mach-xen / asm / floppy.h

diff --git a/include/asm-i386/mach-xen/asm/floppy.h b/include/asm-i386/mach-xen/asm/floppy.h
new file mode 100644 (file)
index 0000000..2d5dd22
--- /dev/null
+++ b/include/asm-i386/mach-xen/asm/floppy.h
@@ -0,0 +1,147 @@
+/*
+ * 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_I386_FLOPPY_H
+#define __ASM_XEN_I386_FLOPPY_H
+
+#include <linux/vmalloc.h>
+
+/* 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()    (virtual_dma_count + virtual_dma_residue)
+#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io)
+/*
+ * 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, get_order(size))
+#define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
+
+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;
+       register int lcount;
+       register char *lptr;
+
+       if (!doing_pdma)
+               return floppy_interrupt(irq, dev_id, regs);
+
+       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);
+
+       if(st == 0x20)
+               return IRQ_HANDLED;
+       if(!(st & 0x20)) {
+               virtual_dma_residue += virtual_dma_count;
+               virtual_dma_count=0;
+               doing_pdma = 0;
+               floppy_interrupt(irq, dev_id, regs);
+               return IRQ_HANDLED;
+       }
+       return IRQ_HANDLED;
+}
+
+static void fd_disable_dma(void)
+{
+       doing_pdma = 0;
+       virtual_dma_residue += virtual_dma_count;
+       virtual_dma_count=0;
+}
+
+static int fd_request_irq(void)
+{
+       return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT,
+                                          "floppy", NULL);
+}
+
+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_I386_FLOPPY_H */