210 строки
6.0 KiB
C
210 строки
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) ST-Ericsson SA 2007-2010
|
|
* Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson
|
|
* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
|
|
*/
|
|
|
|
|
|
#ifndef STE_DMA40_H
|
|
#define STE_DMA40_H
|
|
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
/*
|
|
* Maxium size for a single dma descriptor
|
|
* Size is limited to 16 bits.
|
|
* Size is in the units of addr-widths (1,2,4,8 bytes)
|
|
* Larger transfers will be split up to multiple linked desc
|
|
*/
|
|
#define STEDMA40_MAX_SEG_SIZE 0xFFFF
|
|
|
|
/* dev types for memcpy */
|
|
#define STEDMA40_DEV_DST_MEMORY (-1)
|
|
#define STEDMA40_DEV_SRC_MEMORY (-1)
|
|
|
|
enum stedma40_mode {
|
|
STEDMA40_MODE_LOGICAL = 0,
|
|
STEDMA40_MODE_PHYSICAL,
|
|
STEDMA40_MODE_OPERATION,
|
|
};
|
|
|
|
enum stedma40_mode_opt {
|
|
STEDMA40_PCHAN_BASIC_MODE = 0,
|
|
STEDMA40_LCHAN_SRC_LOG_DST_LOG = 0,
|
|
STEDMA40_PCHAN_MODULO_MODE,
|
|
STEDMA40_PCHAN_DOUBLE_DST_MODE,
|
|
STEDMA40_LCHAN_SRC_PHY_DST_LOG,
|
|
STEDMA40_LCHAN_SRC_LOG_DST_PHY,
|
|
};
|
|
|
|
#define STEDMA40_ESIZE_8_BIT 0x0
|
|
#define STEDMA40_ESIZE_16_BIT 0x1
|
|
#define STEDMA40_ESIZE_32_BIT 0x2
|
|
#define STEDMA40_ESIZE_64_BIT 0x3
|
|
|
|
/* The value 4 indicates that PEN-reg shall be set to 0 */
|
|
#define STEDMA40_PSIZE_PHY_1 0x4
|
|
#define STEDMA40_PSIZE_PHY_2 0x0
|
|
#define STEDMA40_PSIZE_PHY_4 0x1
|
|
#define STEDMA40_PSIZE_PHY_8 0x2
|
|
#define STEDMA40_PSIZE_PHY_16 0x3
|
|
|
|
/*
|
|
* The number of elements differ in logical and
|
|
* physical mode
|
|
*/
|
|
#define STEDMA40_PSIZE_LOG_1 STEDMA40_PSIZE_PHY_2
|
|
#define STEDMA40_PSIZE_LOG_4 STEDMA40_PSIZE_PHY_4
|
|
#define STEDMA40_PSIZE_LOG_8 STEDMA40_PSIZE_PHY_8
|
|
#define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16
|
|
|
|
/* Maximum number of possible physical channels */
|
|
#define STEDMA40_MAX_PHYS 32
|
|
|
|
enum stedma40_flow_ctrl {
|
|
STEDMA40_NO_FLOW_CTRL,
|
|
STEDMA40_FLOW_CTRL,
|
|
};
|
|
|
|
/**
|
|
* struct stedma40_half_channel_info - dst/src channel configuration
|
|
*
|
|
* @big_endian: true if the src/dst should be read as big endian
|
|
* @data_width: Data width of the src/dst hardware
|
|
* @p_size: Burst size
|
|
* @flow_ctrl: Flow control on/off.
|
|
*/
|
|
struct stedma40_half_channel_info {
|
|
bool big_endian;
|
|
enum dma_slave_buswidth data_width;
|
|
int psize;
|
|
enum stedma40_flow_ctrl flow_ctrl;
|
|
};
|
|
|
|
/**
|
|
* struct stedma40_chan_cfg - Structure to be filled by client drivers.
|
|
*
|
|
* @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH
|
|
* @high_priority: true if high-priority
|
|
* @realtime: true if realtime mode is to be enabled. Only available on DMA40
|
|
* version 3+, i.e DB8500v2+
|
|
* @mode: channel mode: physical, logical, or operation
|
|
* @mode_opt: options for the chosen channel mode
|
|
* @dev_type: src/dst device type (driver uses dir to figure out which)
|
|
* @src_info: Parameters for dst half channel
|
|
* @dst_info: Parameters for dst half channel
|
|
* @use_fixed_channel: if true, use physical channel specified by phy_channel
|
|
* @phy_channel: physical channel to use, only if use_fixed_channel is true
|
|
*
|
|
* This structure has to be filled by the client drivers.
|
|
* It is recommended to do all dma configurations for clients in the machine.
|
|
*
|
|
*/
|
|
struct stedma40_chan_cfg {
|
|
enum dma_transfer_direction dir;
|
|
bool high_priority;
|
|
bool realtime;
|
|
enum stedma40_mode mode;
|
|
enum stedma40_mode_opt mode_opt;
|
|
int dev_type;
|
|
struct stedma40_half_channel_info src_info;
|
|
struct stedma40_half_channel_info dst_info;
|
|
|
|
bool use_fixed_channel;
|
|
int phy_channel;
|
|
};
|
|
|
|
/**
|
|
* struct stedma40_platform_data - Configuration struct for the dma device.
|
|
*
|
|
* @dev_tx: mapping between destination event line and io address
|
|
* @dev_rx: mapping between source event line and io address
|
|
* @disabled_channels: A vector, ending with -1, that marks physical channels
|
|
* that are for different reasons not available for the driver.
|
|
* @soft_lli_chans: A vector, that marks physical channels will use LLI by SW
|
|
* which avoids HW bug that exists in some versions of the controller.
|
|
* SoftLLI introduces relink overhead that could impact performace for
|
|
* certain use cases.
|
|
* @num_of_soft_lli_chans: The number of channels that needs to be configured
|
|
* to use SoftLLI.
|
|
* @use_esram_lcla: flag for mapping the lcla into esram region
|
|
* @num_of_memcpy_chans: The number of channels reserved for memcpy.
|
|
* @num_of_phy_chans: The number of physical channels implemented in HW.
|
|
* 0 means reading the number of channels from DMA HW but this is only valid
|
|
* for 'multiple of 4' channels, like 8.
|
|
*/
|
|
struct stedma40_platform_data {
|
|
int disabled_channels[STEDMA40_MAX_PHYS];
|
|
int *soft_lli_chans;
|
|
int num_of_soft_lli_chans;
|
|
bool use_esram_lcla;
|
|
int num_of_memcpy_chans;
|
|
int num_of_phy_chans;
|
|
};
|
|
|
|
#ifdef CONFIG_STE_DMA40
|
|
|
|
/**
|
|
* stedma40_filter() - Provides stedma40_chan_cfg to the
|
|
* ste_dma40 dma driver via the dmaengine framework.
|
|
* does some checking of what's provided.
|
|
*
|
|
* Never directly called by client. It used by dmaengine.
|
|
* @chan: dmaengine handle.
|
|
* @data: Must be of type: struct stedma40_chan_cfg and is
|
|
* the configuration of the framework.
|
|
*
|
|
*
|
|
*/
|
|
|
|
bool stedma40_filter(struct dma_chan *chan, void *data);
|
|
|
|
/**
|
|
* stedma40_slave_mem() - Transfers a raw data buffer to or from a slave
|
|
* (=device)
|
|
*
|
|
* @chan: dmaengine handle
|
|
* @addr: source or destination physicall address.
|
|
* @size: bytes to transfer
|
|
* @direction: direction of transfer
|
|
* @flags: is actually enum dma_ctrl_flags. See dmaengine.h
|
|
*/
|
|
|
|
static inline struct
|
|
dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
|
|
dma_addr_t addr,
|
|
unsigned int size,
|
|
enum dma_transfer_direction direction,
|
|
unsigned long flags)
|
|
{
|
|
struct scatterlist sg;
|
|
sg_init_table(&sg, 1);
|
|
sg.dma_address = addr;
|
|
sg.length = size;
|
|
|
|
return dmaengine_prep_slave_sg(chan, &sg, 1, direction, flags);
|
|
}
|
|
|
|
#else
|
|
static inline bool stedma40_filter(struct dma_chan *chan, void *data)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct
|
|
dma_async_tx_descriptor *stedma40_slave_mem(struct dma_chan *chan,
|
|
dma_addr_t addr,
|
|
unsigned int size,
|
|
enum dma_transfer_direction direction,
|
|
unsigned long flags)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|