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-rw-r--r--arch/arm/plat-stmp3xxx/include/mach/dma.h153
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/arm/plat-stmp3xxx/include/mach/dma.h b/arch/arm/plat-stmp3xxx/include/mach/dma.h
new file mode 100644
index 000000000000..7c58557c6766
--- /dev/null
+++ b/arch/arm/plat-stmp3xxx/include/mach/dma.h
@@ -0,0 +1,153 @@
+/*
+ * Freescale STMP37XX/STMP378X DMA helper interface
+ *
+ * Embedded Alley Solutions, Inc <source@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#ifndef __ASM_PLAT_STMP3XXX_DMA_H
+#define __ASM_PLAT_STMP3XXX_DMA_H
+
+#include <linux/platform_device.h>
+#include <linux/dmapool.h>
+
+#if !defined(MAX_PIO_WORDS)
+#define MAX_PIO_WORDS (15)
+#endif
+
+#define STMP3XXX_BUS_APBH 0
+#define STMP3XXX_BUS_APBX 1
+#define STMP3XXX_DMA_MAX_CHANNEL 16
+#define STMP3XXX_DMA_BUS(dma) ((dma) / 16)
+#define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16)
+#define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel))
+#define MAX_DMA_ADDRESS 0xffffffff
+#define MAX_DMA_CHANNELS 32
+
+struct stmp3xxx_dma_command {
+ u32 next;
+ u32 cmd;
+ union {
+ u32 buf_ptr;
+ u32 alternate;
+ };
+ u32 pio_words[MAX_PIO_WORDS];
+};
+
+struct stmp3xxx_dma_descriptor {
+ struct stmp3xxx_dma_command *command;
+ dma_addr_t handle;
+
+ /* The virtual address of the buffer pointer */
+ void *virtual_buf_ptr;
+ /* The next descriptor in a the DMA chain (optional) */
+ struct stmp3xxx_dma_descriptor *next_descr;
+};
+
+struct stmp37xx_circ_dma_chain {
+ unsigned total_count;
+ struct stmp3xxx_dma_descriptor *chain;
+
+ unsigned free_index;
+ unsigned free_count;
+ unsigned active_index;
+ unsigned active_count;
+ unsigned cooked_index;
+ unsigned cooked_count;
+
+ int bus;
+ unsigned channel;
+};
+
+static inline struct stmp3xxx_dma_descriptor
+ *stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain)
+{
+ return &(chain->chain[chain->free_index]);
+}
+
+static inline struct stmp3xxx_dma_descriptor
+ *stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain)
+{
+ return &(chain->chain[chain->cooked_index]);
+}
+
+int stmp3xxx_dma_request(int ch, struct device *dev, const char *name);
+int stmp3xxx_dma_release(int ch);
+int stmp3xxx_dma_allocate_command(int ch,
+ struct stmp3xxx_dma_descriptor *descriptor);
+int stmp3xxx_dma_free_command(int ch,
+ struct stmp3xxx_dma_descriptor *descriptor);
+void stmp3xxx_dma_continue(int channel, u32 semaphore);
+void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head,
+ u32 semaphore);
+int stmp3xxx_dma_running(int ch);
+int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain,
+ struct stmp3xxx_dma_descriptor descriptors[],
+ unsigned items);
+void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain);
+void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain);
+void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain,
+ unsigned count);
+void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain,
+ unsigned count);
+unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain);
+int stmp3xxx_dma_read_semaphore(int ch);
+void stmp3xxx_dma_init(void);
+void stmp3xxx_dma_set_alt_target(int ch, int target);
+void stmp3xxx_dma_suspend(void);
+void stmp3xxx_dma_resume(void);
+
+/*
+ * STMP37xx and STMP378x have different DMA control
+ * registers layout
+ */
+
+void stmp3xxx_arch_dma_freeze(int ch);
+void stmp3xxx_arch_dma_unfreeze(int ch);
+void stmp3xxx_arch_dma_reset_channel(int ch);
+void stmp3xxx_arch_dma_enable_interrupt(int ch);
+void stmp3xxx_arch_dma_clear_interrupt(int ch);
+int stmp3xxx_arch_dma_is_interrupt(int ch);
+
+static inline void stmp3xxx_dma_reset_channel(int ch)
+{
+ stmp3xxx_arch_dma_reset_channel(ch);
+}
+
+
+static inline void stmp3xxx_dma_freeze(int ch)
+{
+ stmp3xxx_arch_dma_freeze(ch);
+}
+
+static inline void stmp3xxx_dma_unfreeze(int ch)
+{
+ stmp3xxx_arch_dma_unfreeze(ch);
+}
+
+static inline void stmp3xxx_dma_enable_interrupt(int ch)
+{
+ stmp3xxx_arch_dma_enable_interrupt(ch);
+}
+
+static inline void stmp3xxx_dma_clear_interrupt(int ch)
+{
+ stmp3xxx_arch_dma_clear_interrupt(ch);
+}
+
+static inline int stmp3xxx_dma_is_interrupt(int ch)
+{
+ return stmp3xxx_arch_dma_is_interrupt(ch);
+}
+
+#endif /* __ASM_PLAT_STMP3XXX_DMA_H */