134 строки
4.5 KiB
C
134 строки
4.5 KiB
C
/*
|
|
* linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver
|
|
*
|
|
* Copyright (C) 2005 ARM Ltd
|
|
* Copyright (C) 2010 ST-Ericsson SA
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* pl08x information required by platform code
|
|
*
|
|
* Please credit ARM.com
|
|
* Documentation: ARM DDI 0196D
|
|
*/
|
|
|
|
#ifndef AMBA_PL08X_H
|
|
#define AMBA_PL08X_H
|
|
|
|
/* We need sizes of structs from this header */
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
struct pl08x_driver_data;
|
|
struct pl08x_phy_chan;
|
|
struct pl08x_txd;
|
|
|
|
/* Bitmasks for selecting AHB ports for DMA transfers */
|
|
enum {
|
|
PL08X_AHB1 = (1 << 0),
|
|
PL08X_AHB2 = (1 << 1)
|
|
};
|
|
|
|
/**
|
|
* struct pl08x_channel_data - data structure to pass info between
|
|
* platform and PL08x driver regarding channel configuration
|
|
* @bus_id: name of this device channel, not just a device name since
|
|
* devices may have more than one channel e.g. "foo_tx"
|
|
* @min_signal: the minimum DMA signal number to be muxed in for this
|
|
* channel (for platforms supporting muxed signals). If you have
|
|
* static assignments, make sure this is set to the assigned signal
|
|
* number, PL08x have 16 possible signals in number 0 thru 15 so
|
|
* when these are not enough they often get muxed (in hardware)
|
|
* disabling simultaneous use of the same channel for two devices.
|
|
* @max_signal: the maximum DMA signal number to be muxed in for
|
|
* the channel. Set to the same as min_signal for
|
|
* devices with static assignments
|
|
* @muxval: a number usually used to poke into some mux regiser to
|
|
* mux in the signal to this channel
|
|
* @addr: source/target address in physical memory for this DMA channel,
|
|
* can be the address of a FIFO register for burst requests for example.
|
|
* This can be left undefined if the PrimeCell API is used for configuring
|
|
* this.
|
|
* @single: the device connected to this channel will request single DMA
|
|
* transfers, not bursts. (Bursts are default.)
|
|
* @periph_buses: the device connected to this channel is accessible via
|
|
* these buses (use PL08X_AHB1 | PL08X_AHB2).
|
|
*/
|
|
struct pl08x_channel_data {
|
|
const char *bus_id;
|
|
int min_signal;
|
|
int max_signal;
|
|
u32 muxval;
|
|
dma_addr_t addr;
|
|
bool single;
|
|
u8 periph_buses;
|
|
};
|
|
|
|
enum pl08x_burst_size {
|
|
PL08X_BURST_SZ_1,
|
|
PL08X_BURST_SZ_4,
|
|
PL08X_BURST_SZ_8,
|
|
PL08X_BURST_SZ_16,
|
|
PL08X_BURST_SZ_32,
|
|
PL08X_BURST_SZ_64,
|
|
PL08X_BURST_SZ_128,
|
|
PL08X_BURST_SZ_256,
|
|
};
|
|
|
|
enum pl08x_bus_width {
|
|
PL08X_BUS_WIDTH_8_BITS,
|
|
PL08X_BUS_WIDTH_16_BITS,
|
|
PL08X_BUS_WIDTH_32_BITS,
|
|
};
|
|
|
|
/**
|
|
* struct pl08x_platform_data - the platform configuration for the PL08x
|
|
* PrimeCells.
|
|
* @slave_channels: the channels defined for the different devices on the
|
|
* platform, all inclusive, including multiplexed channels. The available
|
|
* physical channels will be multiplexed around these signals as they are
|
|
* requested, just enumerate all possible channels.
|
|
* @num_slave_channels: number of elements in the slave channel array
|
|
* @memcpy_burst_size: the appropriate burst size for memcpy operations
|
|
* @memcpy_bus_width: memory bus width
|
|
* @memcpy_prot_buff: whether memcpy DMA is bufferable
|
|
* @memcpy_prot_cache: whether memcpy DMA is cacheable
|
|
* @get_xfer_signal: request a physical signal to be used for a DMA transfer
|
|
* immediately: if there is some multiplexing or similar blocking the use
|
|
* of the channel the transfer can be denied by returning less than zero,
|
|
* else it returns the allocated signal number
|
|
* @put_xfer_signal: indicate to the platform that this physical signal is not
|
|
* running any DMA transfer and multiplexing can be recycled
|
|
* @lli_buses: buses which LLIs can be fetched from: PL08X_AHB1 | PL08X_AHB2
|
|
* @mem_buses: buses which memory can be accessed from: PL08X_AHB1 | PL08X_AHB2
|
|
* @slave_map: DMA slave matching table
|
|
* @slave_map_len: number of elements in @slave_map
|
|
*/
|
|
struct pl08x_platform_data {
|
|
struct pl08x_channel_data *slave_channels;
|
|
unsigned int num_slave_channels;
|
|
enum pl08x_burst_size memcpy_burst_size;
|
|
enum pl08x_bus_width memcpy_bus_width;
|
|
bool memcpy_prot_buff;
|
|
bool memcpy_prot_cache;
|
|
int (*get_xfer_signal)(const struct pl08x_channel_data *);
|
|
void (*put_xfer_signal)(const struct pl08x_channel_data *, int);
|
|
u8 lli_buses;
|
|
u8 mem_buses;
|
|
const struct dma_slave_map *slave_map;
|
|
int slave_map_len;
|
|
};
|
|
|
|
#ifdef CONFIG_AMBA_PL08X
|
|
bool pl08x_filter_id(struct dma_chan *chan, void *chan_id);
|
|
#else
|
|
static inline bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#endif /* AMBA_PL08X_H */
|