Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 184 insertions, 0 deletions

diff --git a/include/asm-arm26/dma.h b/include/asm-arm26/dma.h
new file mode 100644
index 00000000000..995e223e43a
--- /dev/null
+++ b/include/asm-arm26/dma.h
@@ -0,0 +1,184 @@
+#ifndef __ASM_ARM_DMA_H
+#define __ASM_ARM_DMA_H
+
+typedef unsigned int dmach_t;
+
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <asm/memory.h>
+#include <asm/scatterlist.h>
+
+// FIXME - do we really need this? arm26 cant do 'proper' DMA
+
+typedef struct dma_struct dma_t;
+typedef unsigned int dmamode_t;
+
+struct dma_ops {
+        int     (*request)(dmach_t, dma_t *);           /* optional */
+        void    (*free)(dmach_t, dma_t *);              /* optional */
+        void    (*enable)(dmach_t, dma_t *);            /* mandatory */
+        void    (*disable)(dmach_t, dma_t *);           /* mandatory */
+        int     (*residue)(dmach_t, dma_t *);           /* optional */
+        int     (*setspeed)(dmach_t, dma_t *, int);     /* optional */
+        char    *type;
+};
+
+struct dma_struct {
+        struct scatterlist buf;         /* single DMA                   */
+        int             sgcount;        /* number of DMA SG             */
+        struct scatterlist *sg;         /* DMA Scatter-Gather List      */
+
+        unsigned int    active:1;       /* Transfer active              */
+        unsigned int    invalid:1;      /* Address/Count changed        */
+        unsigned int    using_sg:1;     /* using scatter list?          */
+        dmamode_t       dma_mode;       /* DMA mode                     */
+        int             speed;          /* DMA speed                    */
+
+        unsigned int    lock;           /* Device is allocated          */
+        const char      *device_id;     /* Device name                  */
+
+        unsigned int    dma_base;       /* Controller base address      */
+        int             dma_irq;        /* Controller IRQ               */
+        int             state;          /* Controller state             */
+        struct scatterlist cur_sg;      /* Current controller buffer    */
+
+        struct dma_ops  *d_ops;
+};
+
+/* Prototype: void arch_dma_init(dma)
+ * Purpose  : Initialise architecture specific DMA
+ * Params   : dma - pointer to array of DMA structures
+ */
+extern void arch_dma_init(dma_t *dma);
+
+extern void isa_init_dma(dma_t *dma);
+
+
+#define MAX_DMA_ADDRESS         0x03000000
+#define MAX_DMA_CHANNELS        3
+
+/* ARC */
+#define DMA_VIRTUAL_FLOPPY0     0
+#define DMA_VIRTUAL_FLOPPY1     1
+#define DMA_VIRTUAL_SOUND       2
+
+/* A5K */
+#define DMA_FLOPPY              0
+
+/*
+ * DMA modes
+ */
+#define DMA_MODE_MASK	3
+
+#define DMA_MODE_READ	 0
+#define DMA_MODE_WRITE	 1
+#define DMA_MODE_CASCADE 2
+#define DMA_AUTOINIT	 4
+
+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);
+}
+
+/* Clear the 'DMA Pointer Flip Flop'.
+ * Write 0 for LSB/MSB, 1 for MSB/LSB access.
+ */
+#define clear_dma_ff(channel)
+
+/* Set only the page register bits of the transfer address.
+ *
+ * NOTE: This is an architecture specific function, and should
+ *       be hidden from the drivers
+ */
+extern void set_dma_page(dmach_t channel, char pagenr);
+
+/* Request a DMA channel
+ *
+ * Some architectures may need to do allocate an interrupt
+ */
+extern int  request_dma(dmach_t channel, const char * device_id);
+
+/* Free a DMA channel
+ *
+ * Some architectures may need to do free an interrupt
+ */
+extern void free_dma(dmach_t channel);
+
+/* Enable DMA for this channel
+ *
+ * On some architectures, this may have other side effects like
+ * enabling an interrupt and setting the DMA registers.
+ */
+extern void enable_dma(dmach_t channel);
+
+/* Disable DMA for this channel
+ *
+ * On some architectures, this may have other side effects like
+ * disabling an interrupt or whatever.
+ */
+extern void disable_dma(dmach_t channel);
+
+/* Test whether the specified channel has an active DMA transfer
+ */
+extern int dma_channel_active(dmach_t channel);
+
+/* Set the DMA scatter gather list for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA address immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_sg(dmach_t channel, struct scatterlist *sg, int nr_sg);
+
+/* Set the DMA address for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA address immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_addr(dmach_t channel, unsigned long physaddr);
+
+/* Set the DMA byte count for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA count immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_count(dmach_t channel, unsigned long count);
+
+/* Set the transfer direction for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA transfer direction immediately, but defer it to the
+ * enable_dma().
+ */
+extern void set_dma_mode(dmach_t channel, dmamode_t mode);
+
+/* Set the transfer speed for this channel
+ */
+extern void set_dma_speed(dmach_t channel, int cycle_ns);
+
+/* Get DMA residue count. After a DMA transfer, this
+ * should return zero. Reading this while a DMA transfer is
+ * still in progress will return unpredictable results.
+ * If called before the channel has been used, it may return 1.
+ * Otherwise, it returns the number of _bytes_ left to transfer.
+ */
+extern int  get_dma_residue(dmach_t channel);
+
+#ifndef NO_DMA
+#define NO_DMA	255
+#endif
+
+#endif /* _ARM_DMA_H */