From 980db8ca43066dc094517df01fe560ccac87ecfb Mon Sep 17 00:00:00 2001 From: Sylvain Lemieux Date: Mon, 10 Aug 2015 08:16:31 -0400 Subject: 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 Acked-by: Marek Vasut Tested-by: Vladimir Zapolskiy --- arch/arm/include/asm/arch-lpc32xx/clk.h | 3 ++ arch/arm/include/asm/arch-lpc32xx/dma.h | 67 +++++++++++++++++++++++++++ arch/arm/include/asm/arch-lpc32xx/sys_proto.h | 1 + 3 files changed, 71 insertions(+) create mode 100644 arch/arm/include/asm/arch-lpc32xx/dma.h (limited to 'arch/arm/include') 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 + +/* + * 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 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); -- cgit