/* 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 0 x00000004 /* Address Error Flag */
#define DMAOR_NMIF 0 x00000002
#define DMAOR_DME 0 x00000001 /* DMA Master Enable */
/* Definitions for the SuperH DMAC */
#define DM_INC 0 x00004000 /* Destination addresses are incremented */
#define DM_DEC 0 x00008000 /* Destination addresses are decremented */
#define DM_FIX 0 x0000c000 /* Destination address is fixed */
#define SM_INC 0 x00001000 /* Source addresses are incremented */
#define SM_DEC 0 x00002000 /* Source addresses are decremented */
#define SM_FIX 0 x00003000 /* Source address is fixed */
#define RS_AUTO 0 x00000400 /* Auto Request */
#define RS_ERS 0 x00000800 /* DMA extended resource selector */
#define CHCR_DE 0 x00000001 /* DMA Enable */
#define CHCR_TE 0 x00000002 /* Transfer End Flag */
#define CHCR_IE 0 x00000004 /* Interrupt Enable */
#endif
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