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sh_dma.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Header for the new SH dmaengine driver * * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> */ #ifndef SH_DMA_H #define SH_DMA_H #include <linux/dmaengine.h> #include <linux/list.h> #include <linux/shdma-base.h> #include <linux/types.h> struct device; /* Used by slave DMA clients to request DMA to/from a specific peripheral */ struct sh_dmae_slave { struct shdma_slave shdma_slave; /* Set by the platform */ }; /* * Supplied by platforms to specify, how a DMA channel has to be configured for * a certain peripheral */ struct sh_dmae_slave_config { int slave_id; dma_addr_t addr; u32 chcr; char mid_rid; }; /** * struct sh_dmae_channel - DMAC channel platform data * @offset: register offset within the main IOMEM resource * @dmars: channel DMARS register offset * @chclr_offset: channel CHCLR register offset * @dmars_bit: channel DMARS field offset within the register * @chclr_bit: bit position, to be set to reset the channel */ struct sh_dmae_channel { unsigned int offset; unsigned int dmars; unsigned int chclr_offset; unsigned char dmars_bit; unsigned char chclr_bit; }; /** * struct sh_dmae_pdata - DMAC platform data * @slave: array of slaves * @slave_num: number of slaves in the above array * @channel: array of DMA channels * @channel_num: number of channels in the above array * @ts_low_shift: shift of the low part of the TS field * @ts_low_mask: low TS field mask * @ts_high_shift: additional shift of the high part of the TS field * @ts_high_mask: high TS field mask * @ts_shift: array of Transfer Size shifts, indexed by TS value * @ts_shift_num: number of shifts in the above array * @dmaor_init: DMAOR initialisation value * @chcr_offset: CHCR address offset * @chcr_ie_bit: CHCR Interrupt Enable bit * @dmaor_is_32bit: DMAOR is a 32-bit register * @needs_tend_set: the TEND register has to be set * @no_dmars: DMAC has no DMARS registers * @chclr_present: DMAC has one or several CHCLR registers * @chclr_bitwise: channel CHCLR registers are bitwise * @slave_only: DMAC cannot be used for MEMCPY */ struct sh_dmae_pdata { const struct sh_dmae_slave_config *slave; int slave_num; const struct sh_dmae_channel *channel; int channel_num; unsigned int ts_low_shift; unsigned int ts_low_mask; unsigned int ts_high_shift; unsigned int ts_high_mask; const unsigned int *ts_shift; int ts_shift_num; u16 dmaor_init; unsigned int chcr_offset; u32 chcr_ie_bit; unsigned int dmaor_is_32bit:1; unsigned int needs_tend_set:1; unsigned int no_dmars:1; unsigned int chclr_present:1; unsigned int chclr_bitwise:1; unsigned int slave_only:1; }; /* DMAOR definitions */ #define DMAOR_AE 0x00000004 /* Address Error Flag */ #define DMAOR_NMIF 0x00000002 #define DMAOR_DME 0x00000001 /* DMA Master Enable */ /* Definitions for the SuperH DMAC */ #define DM_INC 0x00004000 /* Destination addresses are incremented */ #define DM_DEC 0x00008000 /* Destination addresses are decremented */ #define DM_FIX 0x0000c000 /* Destination address is fixed */ #define SM_INC 0x00001000 /* Source addresses are incremented */ #define SM_DEC 0x00002000 /* Source addresses are decremented */ #define SM_FIX 0x00003000 /* Source address is fixed */ #define RS_AUTO 0x00000400 /* Auto Request */ #define RS_ERS 0x00000800 /* DMA extended resource selector */ #define CHCR_DE 0x00000001 /* DMA Enable */ #define CHCR_TE 0x00000002 /* Transfer End Flag */ #define CHCR_IE 0x00000004 /* Interrupt Enable */ #endif
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