1 files changed, 215 insertions, 0 deletions

diff --git a/arch/arm26/machine/dma.c b/arch/arm26/machine/dma.c
new file mode 100644
index 000000000000..cbc7c61d5b32
--- /dev/null
+++ b/arch/arm26/machine/dma.c
@@ -0,0 +1,215 @@
+/*
+ *  linux/arch/arm26/kernel/dma.c
+ *
+ *  Copyright (C) 1998-1999 Dave Gilbert / Russell King
+ *  Copyright (C) 2003 Ian Molton
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  DMA functions specific to Archimedes and A5000 architecture
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <asm/dma.h>
+#include <asm/fiq.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+
+#define DPRINTK(x...) printk(KERN_DEBUG x)
+
+#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
+
+extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
+extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
+extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
+
+static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
+{
+        DPRINTK("arc_floppy_data_enable_dma\n");
+
+        if (dma->using_sg)
+                BUG();
+
+        switch (dma->dma_mode) {
+        case DMA_MODE_READ: { /* read */
+                unsigned long flags;
+                DPRINTK("enable_dma fdc1772 data read\n");
+                local_save_flags_cli(flags);
+                clf();
+                        
+                memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
+                        &fdc1772_dma_read_end - &fdc1772_dma_read);
+                fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
+                enable_fiq(FIQ_FLOPPYDATA);
+                local_irq_restore(flags);
+           }
+           break;
+
+        case DMA_MODE_WRITE: { /* write */
+                unsigned long flags;
+                DPRINTK("enable_dma fdc1772 data write\n");
+                local_save_flags_cli(flags);
+                clf();
+                memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
+                        &fdc1772_dma_write_end - &fdc1772_dma_write);
+                fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
+                enable_fiq(FIQ_FLOPPYDATA);
+
+                local_irq_restore(flags);
+            }
+            break;
+        default:
+                printk ("enable_dma: dma%d not initialised\n", channel);
+        }
+}
+
+static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+        extern unsigned int fdc1772_bytestogo;
+
+        /* 10/1/1999 DAG - I presume its the number of bytes left? */
+        return fdc1772_bytestogo;
+}
+
+static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
+{
+        /* Need to build a branch at the FIQ address */
+        extern void fdc1772_comendhandler(void);
+        unsigned long flags;
+
+        DPRINTK("arc_floppy_cmdend_enable_dma\n");
+        /*printk("enable_dma fdc1772 command end FIQ\n");*/
+        save_flags(flags);
+        clf();
+        
+        /* B fdc1772_comendhandler */
+        *((unsigned int *)0x1c)=0xea000000 |
+                        (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
+
+        local_irq_restore(flags);
+}
+
+static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+        /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
+        extern unsigned int fdc1772_fdc_int_done;
+
+        /* Explicit! If the int done is 0 then 1 int to go */
+        return (fdc1772_fdc_int_done==0)?1:0;
+}
+
+static void arc_disable_dma(dmach_t channel, dma_t *dma)
+{
+        disable_fiq(dma->dma_irq);
+}
+
+static struct dma_ops arc_floppy_data_dma_ops = {
+        .type           = "FIQDMA",
+        .enable         = arc_floppy_data_enable_dma,
+        .disable        = arc_disable_dma,
+        .residue        = arc_floppy_data_get_dma_residue,
+};
+
+static struct dma_ops arc_floppy_cmdend_dma_ops = {
+        .type           = "FIQCMD",
+        .enable         = arc_floppy_cmdend_enable_dma,
+        .disable        = arc_disable_dma,
+        .residue        = arc_floppy_cmdend_get_dma_residue,
+};
+#endif
+
+#ifdef CONFIG_ARCH_A5K
+static struct fiq_handler fh = {
+        .name   = "floppydata"
+};
+
+static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
+{
+        struct pt_regs regs;
+        get_fiq_regs(&regs);
+        return regs.ARM_r9;
+}
+
+static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
+{
+        struct pt_regs regs;
+        void *fiqhandler_start;
+        unsigned int fiqhandler_length;
+        extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
+                                     unsigned long port);
+
+        if (dma->using_sg)
+                BUG();
+
+        if (dma->dma_mode == DMA_MODE_READ) {
+                extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
+                fiqhandler_start = &floppy_fiqin_start;
+                fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
+        } else {
+                extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
+                fiqhandler_start = &floppy_fiqout_start;
+                fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
+        }
+        if (claim_fiq(&fh)) {
+                printk("floppydma: couldn't claim FIQ.\n");
+                return;
+        }
+        memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
+        regs.ARM_r9 = dma->buf.length;
+        regs.ARM_r10 = (unsigned long)dma->buf.__address;
+        regs.ARM_fp = FLOPPYDMA_BASE;
+        set_fiq_regs(&regs);
+        enable_fiq(dma->dma_irq);
+}
+
+static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
+{
+        disable_fiq(dma->dma_irq);
+        release_fiq(&fh);
+}
+
+static struct dma_ops a5k_floppy_dma_ops = {
+        .type           = "FIQDMA",
+        .enable         = a5k_floppy_enable_dma,
+        .disable        = a5k_floppy_disable_dma,
+        .residue        = a5k_floppy_get_dma_residue,
+};
+#endif
+
+/*
+ * This is virtual DMA - we don't need anything here
+ */
+static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
+{
+}
+
+static struct dma_ops sound_dma_ops = {
+        .type           = "VIRTUAL",
+        .enable         = sound_enable_disable_dma,
+        .disable        = sound_enable_disable_dma,
+};
+
+void __init arch_dma_init(dma_t *dma)
+{
+#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
+        if (machine_is_archimedes()) {
+                dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
+                dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &arc_floppy_data_dma_ops;
+                dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
+                dma[DMA_VIRTUAL_FLOPPY1].d_ops   = &arc_floppy_cmdend_dma_ops;
+        }
+#endif
+#ifdef CONFIG_ARCH_A5K
+        if (machine_is_a5k()) {
+                dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
+                dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &a5k_floppy_dma_ops;
+        }
+#endif
+        dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
+}