1 files changed, 281 insertions, 0 deletions

diff --git a/arch/x86/include/asm/floppy.h b/arch/x86/include/asm/floppy.h
new file mode 100644
index 000000000000..7d83a3a83e37
--- /dev/null
+++ b/arch/x86/include/asm/floppy.h
@@ -0,0 +1,281 @@
+/*
+ * 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
+ */
+#ifndef ASM_X86__FLOPPY_H
+#define ASM_X86__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))
+
+#define CROSS_64KB(a, s) _CROSS_64KB(a, s, use_virtual_dma & 1)
+
+
+#define SW fd_routine[use_virtual_dma & 1]
+#define CSW fd_routine[can_use_virtual_dma & 1]
+
+
+#define fd_inb(port)            inb_p(port)
+#define fd_outb(value, port)    outb_p(value, port)
+
+#define fd_request_dma()        CSW._request_dma(FLOPPY_DMA, "floppy")
+#define fd_free_dma()           CSW._free_dma(FLOPPY_DMA)
+#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()    SW._get_dma_residue(FLOPPY_DMA)
+#define fd_dma_mem_alloc(size)  SW._dma_mem_alloc(size)
+#define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
+
+#define FLOPPY_CAN_FALLBACK_ON_NODMA
+
+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)
+{
+        unsigned char st;
+
+#undef TRACE_FLPY_INT
+
+#ifdef TRACE_FLPY_INT
+        static int calls;
+        static int bytes;
+        static int dma_wait;
+#endif
+        if (!doing_pdma)
+                return floppy_interrupt(irq, dev_id);
+
+#ifdef TRACE_FLPY_INT
+        if (!calls)
+                bytes = virtual_dma_count;
+#endif
+
+        {
+                int lcount;
+                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);
+                return IRQ_HANDLED;
+        }
+#ifdef TRACE_FLPY_INT
+        if (!virtual_dma_count)
+                dma_wait++;
+#endif
+        return IRQ_HANDLED;
+}
+
+static void fd_disable_dma(void)
+{
+        if (!(can_use_virtual_dma & 1))
+                disable_dma(FLOPPY_DMA);
+        doing_pdma = 0;
+        virtual_dma_residue += virtual_dma_count;
+        virtual_dma_count = 0;
+}
+
+static int vdma_request_dma(unsigned int dmanr, const char *device_id)
+{
+        return 0;
+}
+
+static void vdma_nop(unsigned int dummy)
+{
+}
+
+
+static int vdma_get_dma_residue(unsigned int dummy)
+{
+        return virtual_dma_count + virtual_dma_residue;
+}
+
+
+static int fd_request_irq(void)
+{
+        if (can_use_virtual_dma)
+                return request_irq(FLOPPY_IRQ, floppy_hardint,
+                                   IRQF_DISABLED, "floppy", NULL);
+        else
+                return request_irq(FLOPPY_IRQ, floppy_interrupt,
+                                   IRQF_DISABLED, "floppy", NULL);
+}
+
+static unsigned long dma_mem_alloc(unsigned long size)
+{
+        return __get_dma_pages(GFP_KERNEL|__GFP_NORETRY, get_order(size));
+}
+
+
+static unsigned long vdma_mem_alloc(unsigned long size)
+{
+        return (unsigned long)vmalloc(size);
+
+}
+
+#define nodma_mem_alloc(size) vdma_mem_alloc(size)
+
+static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
+{
+        if ((unsigned long)addr >= (unsigned long)high_memory)
+                vfree((void *)addr);
+        else
+                free_pages(addr, get_order(size));
+}
+
+#define fd_dma_mem_free(addr, size)  _fd_dma_mem_free(addr, size)
+
+static void _fd_chose_dma_mode(char *addr, unsigned long size)
+{
+        if (can_use_virtual_dma == 2) {
+                if ((unsigned long)addr >= (unsigned long)high_memory ||
+                    isa_virt_to_bus(addr) >= 0x1000000 ||
+                    _CROSS_64KB(addr, size, 0))
+                        use_virtual_dma = 1;
+                else
+                        use_virtual_dma = 0;
+        } else {
+                use_virtual_dma = can_use_virtual_dma & 1;
+        }
+}
+
+#define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
+
+
+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;
+}
+
+static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
+{
+#ifdef FLOPPY_SANITY_CHECK
+        if (CROSS_64KB(addr, size)) {
+                printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
+                return -1;
+        }
+#endif
+        /* actual, physical DMA */
+        doing_pdma = 0;
+        clear_dma_ff(FLOPPY_DMA);
+        set_dma_mode(FLOPPY_DMA, mode);
+        set_dma_addr(FLOPPY_DMA, isa_virt_to_bus(addr));
+        set_dma_count(FLOPPY_DMA, size);
+        enable_dma(FLOPPY_DMA);
+        return 0;
+}
+
+static struct fd_routine_l {
+        int (*_request_dma)(unsigned int dmanr, const char *device_id);
+        void (*_free_dma)(unsigned int dmanr);
+        int (*_get_dma_residue)(unsigned int dummy);
+        unsigned long (*_dma_mem_alloc)(unsigned long size);
+        int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
+} fd_routine[] = {
+        {
+                request_dma,
+                free_dma,
+                get_dma_residue,
+                dma_mem_alloc,
+                hard_dma_setup
+        },
+        {
+                vdma_request_dma,
+                vdma_nop,
+                vdma_get_dma_residue,
+                vdma_mem_alloc,
+                vdma_dma_setup
+        }
+};
+
+
+static int FDC1 = 0x3f0;
+static int FDC2 = -1;
+
+/*
+ * 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 EXTRA_FLOPPY_PARAMS
+
+#endif /* ASM_X86__FLOPPY_H */