dma: ti-edma3: introduce edma3 driver

The EDMA3 controller’s primary purpose is to service data transfers
that you program between two memory-mapped slave endpoints on the device.

Typical usage includes, but is not limited to the following:
- Servicing software-driven paging transfers (e.g., transfers from external
  memory, such as SDRAM to internal device memory, such as DSP L2 SRAM)
- Servicing event-driven peripherals, such as a serial port
- Performing sorting or sub-frame extraction of various data structures
- Offloading data transfers from the main device DSP(s)
- See the device-specific data manual for specific peripherals that are
  accessible via the EDMA3 controller

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/arch/arm/include/asm/ti-common/ti-edma3.h b/arch/arm/include/asm/ti-common/ti-edma3.h
new file mode 100644
index 0000000..5adc1da
--- /dev/null
+++ b/arch/arm/include/asm/ti-common/ti-edma3.h
@@ -0,0 +1,121 @@
+/*
+ * Enhanced Direct Memory Access (EDMA3) Controller
+ *
+ * (C) Copyright 2014
+ *     Texas Instruments Incorporated, <www.ti.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef _EDMA3_H_
+#define _EDMA3_H_
+
+#include <linux/stddef.h>
+
+#define EDMA3_PARSET_NULL_LINK			0xffff
+
+/*
+ * All parameter RAM set options
+ * opt field in edma3_param_set_config structure
+ */
+#define EDMA3_SLOPT_PRIV_LEVEL			BIT(31)
+#define EDMA3_SLOPT_PRIV_ID(id)			((0xf & (id)) << 24)
+#define EDMA3_SLOPT_INTERM_COMP_CHAIN_ENB	BIT(23)
+#define EDMA3_SLOPT_TRANS_COMP_CHAIN_ENB	BIT(22)
+#define EDMA3_SLOPT_INTERM_COMP_INT_ENB		BIT(21)
+#define EDMA3_SLOPT_TRANS_COMP_INT_ENB		BIT(20)
+#define EDMA3_SLOPT_COMP_CODE(code)		((0x3f & (code)) << 12)
+#define EDMA3_SLOPT_FIFO_WIDTH_8		0
+#define EDMA3_SLOPT_FIFO_WIDTH_16		(1 << 8)
+#define EDMA3_SLOPT_FIFO_WIDTH_32		(2 << 8)
+#define EDMA3_SLOPT_FIFO_WIDTH_64		(3 << 8)
+#define EDMA3_SLOPT_FIFO_WIDTH_128		(4 << 8)
+#define EDMA3_SLOPT_FIFO_WIDTH_256		(5 << 8)
+#define EDMA3_SLOPT_FIFO_WIDTH_SET(w)		((w & 0x7) << 8)
+#define EDMA3_SLOPT_STATIC			BIT(3)
+#define EDMA3_SLOPT_AB_SYNC			BIT(2)
+#define EDMA3_SLOPT_DST_ADDR_CONST_MODE		BIT(1)
+#define EDMA3_SLOPT_SRC_ADDR_CONST_MODE		BIT(0)
+
+enum edma3_address_mode {
+	INCR = 0,
+	FIFO = 1
+};
+
+enum edma3_fifo_width {
+	W8BIT = 0,
+	W16BIT = 1,
+	W32BIT = 2,
+	W64BIT = 3,
+	W128BIT = 4,
+	W256BIT = 5
+};
+
+enum edma3_sync_dimension {
+	ASYNC = 0,
+	ABSYNC = 1
+};
+
+/* PaRAM slots are laid out like this */
+struct edma3_slot_layout {
+	u32 opt;
+	u32 src;
+	u32 a_b_cnt;
+	u32 dst;
+	u32 src_dst_bidx;
+	u32 link_bcntrld;
+	u32 src_dst_cidx;
+	u32 ccnt;
+} __packed;
+
+/*
+ * Use this to assign trigger word number of edma3_slot_layout struct.
+ * trigger_word_name - is the exact name from edma3_slot_layout.
+ */
+#define EDMA3_TWORD(trigger_word_name)\
+		(offsetof(struct edma3_slot_layout, trigger_word_name) / 4)
+
+struct edma3_slot_config {
+	u32 opt;
+	u32 src;
+	u32 dst;
+	int bcnt;
+	int acnt;
+	int ccnt;
+	int src_bidx;
+	int dst_bidx;
+	int src_cidx;
+	int dst_cidx;
+	int bcntrld;
+	int link;
+};
+
+struct edma3_channel_config {
+	int slot;
+	int chnum;
+	int complete_code;	/* indicate pending complete interrupt */
+	int trigger_slot_word;	/* only used for qedma */
+};
+
+void qedma3_start(u32 base, struct edma3_channel_config *cfg);
+void qedma3_stop(u32 base, struct edma3_channel_config *cfg);
+void edma3_slot_configure(u32 base, int slot, struct edma3_slot_config *cfg);
+int edma3_check_for_transfer(u32 base, struct edma3_channel_config *cfg);
+void edma3_write_slot(u32 base, int slot, struct edma3_slot_layout *param);
+void edma3_read_slot(u32 base, int slot, struct edma3_slot_layout *param);
+
+void edma3_set_dest(u32 base, int slot, u32 dst, enum edma3_address_mode mode,
+		    enum edma3_fifo_width width);
+void edma3_set_dest_index(u32 base, unsigned slot, int bidx, int cidx);
+void edma3_set_dest_addr(u32 base, int slot, u32 dst);
+
+void edma3_set_src(u32 base, int slot, u32 src, enum edma3_address_mode mode,
+		   enum edma3_fifo_width width);
+void edma3_set_src_index(u32 base, unsigned slot, int bidx, int cidx);
+void edma3_set_src_addr(u32 base, int slot, u32 src);
+
+void edma3_set_transfer_params(u32 base, int slot, int acnt,
+			       int bcnt, int ccnt, u16 bcnt_rld,
+			       enum edma3_sync_dimension sync_mode);
+
+#endif