aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-at91/include/mach/at_hdmac.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-at91/include/mach/at_hdmac.h')
-rw-r--r--arch/arm/mach-at91/include/mach/at_hdmac.h102
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/include/mach/at_hdmac.h b/arch/arm/mach-at91/include/mach/at_hdmac.h
new file mode 100644
index 0000000..187cb58
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/at_hdmac.h
@@ -0,0 +1,102 @@
+/*
+ * Header file for the Atmel AHB DMA Controller driver
+ *
+ * Copyright (C) 2008 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef AT_HDMAC_H
+#define AT_HDMAC_H
+
+#include <linux/dmaengine.h>
+
+/**
+ * struct at_dma_platform_data - Controller configuration parameters
+ * @nr_channels: Number of channels supported by hardware (max 8)
+ * @cap_mask: dma_capability flags supported by the platform
+ */
+struct at_dma_platform_data {
+ unsigned int nr_channels;
+ dma_cap_mask_t cap_mask;
+};
+
+/**
+ * enum at_dma_slave_width - DMA slave register access width.
+ * @AT_DMA_SLAVE_WIDTH_8BIT: Do 8-bit slave register accesses
+ * @AT_DMA_SLAVE_WIDTH_16BIT: Do 16-bit slave register accesses
+ * @AT_DMA_SLAVE_WIDTH_32BIT: Do 32-bit slave register accesses
+ */
+enum at_dma_slave_width {
+ AT_DMA_SLAVE_WIDTH_8BIT = 0,
+ AT_DMA_SLAVE_WIDTH_16BIT,
+ AT_DMA_SLAVE_WIDTH_32BIT,
+};
+
+/**
+ * struct at_dma_slave - Controller-specific information about a slave
+ * @dma_dev: required DMA master device
+ * @tx_reg: physical address of data register used for
+ * memory-to-peripheral transfers
+ * @rx_reg: physical address of data register used for
+ * peripheral-to-memory transfers
+ * @reg_width: peripheral register width
+ * @cfg: Platform-specific initializer for the CFG register
+ * @ctrla: Platform-specific initializer for the CTRLA register
+ */
+struct at_dma_slave {
+ struct device *dma_dev;
+ dma_addr_t tx_reg;
+ dma_addr_t rx_reg;
+ enum at_dma_slave_width reg_width;
+ u32 cfg;
+ u32 ctrla;
+};
+
+
+/* Platform-configurable bits in CFG */
+#define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */
+#define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */
+#define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */
+#define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */
+#define ATC_SRC_H2SEL_SW (0x0 << 9)
+#define ATC_SRC_H2SEL_HW (0x1 << 9)
+#define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */
+#define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */
+#define ATC_DST_H2SEL_SW (0x0 << 13)
+#define ATC_DST_H2SEL_HW (0x1 << 13)
+#define ATC_SOD (0x1 << 16) /* Stop On Done */
+#define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */
+#define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */
+#define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */
+#define ATC_LOCK_IF_L_CHUNK (0x0 << 22)
+#define ATC_LOCK_IF_L_BUFFER (0x1 << 22)
+#define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */
+#define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */
+#define ATC_FIFOCFG_LARGESTBURST (0x0 << 28)
+#define ATC_FIFOCFG_HALFFIFO (0x1 << 28)
+#define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28)
+
+/* Platform-configurable bits in CTRLA */
+#define ATC_SCSIZE_MASK (0x7 << 16) /* Source Chunk Transfer Size */
+#define ATC_SCSIZE_1 (0x0 << 16)
+#define ATC_SCSIZE_4 (0x1 << 16)
+#define ATC_SCSIZE_8 (0x2 << 16)
+#define ATC_SCSIZE_16 (0x3 << 16)
+#define ATC_SCSIZE_32 (0x4 << 16)
+#define ATC_SCSIZE_64 (0x5 << 16)
+#define ATC_SCSIZE_128 (0x6 << 16)
+#define ATC_SCSIZE_256 (0x7 << 16)
+#define ATC_DCSIZE_MASK (0x7 << 20) /* Destination Chunk Transfer Size */
+#define ATC_DCSIZE_1 (0x0 << 20)
+#define ATC_DCSIZE_4 (0x1 << 20)
+#define ATC_DCSIZE_8 (0x2 << 20)
+#define ATC_DCSIZE_16 (0x3 << 20)
+#define ATC_DCSIZE_32 (0x4 << 20)
+#define ATC_DCSIZE_64 (0x5 << 20)
+#define ATC_DCSIZE_128 (0x6 << 20)
+#define ATC_DCSIZE_256 (0x7 << 20)
+
+#endif /* AT_HDMAC_H */