summaryrefslogtreecommitdiff
path: root/include/asm-arm26/dma.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-arm26/dma.h')
-rw-r--r--include/asm-arm26/dma.h184
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 000000000000..995e223e43a1
--- /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 */