dma: lpc32xx: add DMA driver

Incorporate DMA driver from legacy LPCLinux NXP BSP.
The files taken from the legacy patch are:
- lpc32xx DMA driver
- lpc3250 header file DMA registers definition.

The legacy driver was updated and clean-up as part of the integration with the latest u-boot.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Marek Vasut <marex@denx.de>
Tested-by: Vladimir Zapolskiy <vz@mleia.com>

3 files changed, 71 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-lpc32xx/clk.h b/arch/arm/include/asm/arch-lpc32xx/clk.h
index 010211a7e1..663f6bc777 100644
--- a/arch/arm/include/asm/arch-lpc32xx/clk.h
+++ b/arch/arm/include/asm/arch-lpc32xx/clk.h
@@ -158,6 +158,9 @@ struct clk_pm_regs {
 #define CLK_NAND_SLC_SELECT		(1 << 2)
 #define CLK_NAND_MLC_INT		(1 << 5)
 
+/* DMA Clock Control Register bits */
+#define DMA_CLK_ENABLE			(1 << 0)
+
 /* SSP Clock Control Register bits */
 #define CLK_SSP0_ENABLE_CLOCK		(1 << 0)
 
diff --git a/arch/arm/include/asm/arch-lpc32xx/dma.h b/arch/arm/include/asm/arch-lpc32xx/dma.h
new file mode 100644
index 0000000000..b4569afc5f
--- /dev/null
+++ b/arch/arm/include/asm/arch-lpc32xx/dma.h
@@ -0,0 +1,67 @@
+/*
+ * LPC32xx DMA Controller Interface
+ *
+ * Copyright (C) 2008 by NXP Semiconductors
+ * @Author: Kevin Wells
+ * @Descr: Definitions for LPC3250 chip
+ * @References: NXP LPC3250 User's Guide
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _LPC32XX_DMA_H
+#define _LPC32XX_DMA_H
+
+#include <common.h>
+
+/*
+ * DMA linked list structure used with a channel's LLI register;
+ * refer to UM10326, "LPC32x0 and LPC32x0/01 User manual" - Rev. 3
+ * tables 84, 85, 86 & 87 for details.
+ */
+struct lpc32xx_dmac_ll {
+	u32 dma_src;
+	u32 dma_dest;
+	u32 next_lli;
+	u32 next_ctrl;
+};
+
+/* control register definitions */
+#define DMAC_CHAN_INT_TC_EN	(1 << 31) /* channel terminal count interrupt */
+#define DMAC_CHAN_DEST_AUTOINC	(1 << 27) /* automatic destination increment */
+#define DMAC_CHAN_SRC_AUTOINC	(1 << 26) /* automatic source increment */
+#define DMAC_CHAN_DEST_AHB1	(1 << 25) /* AHB1 master for dest. transfer */
+#define DMAC_CHAN_DEST_WIDTH_32	(1 << 22) /* Destination data width selection */
+#define DMAC_CHAN_SRC_WIDTH_32	(1 << 19) /* Source data width selection */
+#define DMAC_CHAN_DEST_BURST_1	0
+#define DMAC_CHAN_DEST_BURST_4	(1 << 15) /* Destination data burst size */
+#define DMAC_CHAN_SRC_BURST_1	0
+#define DMAC_CHAN_SRC_BURST_4	(1 << 12) /* Source data burst size */
+
+/*
+ * config_ch register definitions
+ * DMAC_CHAN_FLOW_D_xxx: flow control with DMA as the controller
+ * DMAC_DEST_PERIP: Macro for loading destination peripheral
+ * DMAC_SRC_PERIP: Macro for loading source peripheral
+ */
+#define DMAC_CHAN_FLOW_D_M2P	(0x1 << 11)
+#define DMAC_CHAN_FLOW_D_P2M	(0x2 << 11)
+#define DMAC_DEST_PERIP(n)	(((n) & 0x1F) << 6)
+#define DMAC_SRC_PERIP(n)	(((n) & 0x1F) << 1)
+
+/*
+ * config_ch register definitions
+ * (source and destination peripheral ID numbers).
+ * These can be used with the DMAC_DEST_PERIP and DMAC_SRC_PERIP macros.
+ */
+#define DMA_PERID_NAND1		1
+
+/* Channel enable bit */
+#define DMAC_CHAN_ENABLE	(1 << 0)
+
+int lpc32xx_dma_get_channel(void);
+int lpc32xx_dma_start_xfer(unsigned int channel,
+			   const struct lpc32xx_dmac_ll *desc, u32 config);
+int lpc32xx_dma_wait_status(unsigned int channel);
+
+#endif /* _LPC32XX_DMA_H */
diff --git a/arch/arm/include/asm/arch-lpc32xx/sys_proto.h b/arch/arm/include/asm/arch-lpc32xx/sys_proto.h
index 0845f83e86..d6e5e683e8 100644
--- a/arch/arm/include/asm/arch-lpc32xx/sys_proto.h
+++ b/arch/arm/include/asm/arch-lpc32xx/sys_proto.h
@@ -10,6 +10,7 @@
 #include <asm/arch/emc.h>
 
 void lpc32xx_uart_init(unsigned int uart_id);
+void lpc32xx_dma_init(void);
 void lpc32xx_mac_init(void);
 void lpc32xx_mlc_nand_init(void);
 void lpc32xx_slc_nand_init(void);