131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver
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*
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* Copyright (C) 2005 ARM Ltd
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* Copyright (C) 2010 ST-Ericsson SA
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*
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* pl08x information required by platform code
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*
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* Please credit ARM.com
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* Documentation: ARM DDI 0196D
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*/
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#ifndef AMBA_PL08X_H
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#define AMBA_PL08X_H
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/* We need sizes of structs from this header */
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#include <linux/dmaengine.h>
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#include <linux/interrupt.h>
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struct pl08x_driver_data;
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struct pl08x_phy_chan;
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struct pl08x_txd;
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/* Bitmasks for selecting AHB ports for DMA transfers */
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enum {
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PL08X_AHB1 = (1 << 0),
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PL08X_AHB2 = (1 << 1)
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};
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/**
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* struct pl08x_channel_data - data structure to pass info between
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* platform and PL08x driver regarding channel configuration
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* @bus_id: name of this device channel, not just a device name since
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* devices may have more than one channel e.g. "foo_tx"
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* @min_signal: the minimum DMA signal number to be muxed in for this
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* channel (for platforms supporting muxed signals). If you have
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* static assignments, make sure this is set to the assigned signal
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* number, PL08x have 16 possible signals in number 0 thru 15 so
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* when these are not enough they often get muxed (in hardware)
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* disabling simultaneous use of the same channel for two devices.
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* @max_signal: the maximum DMA signal number to be muxed in for
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* the channel. Set to the same as min_signal for
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* devices with static assignments
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* @muxval: a number usually used to poke into some mux regiser to
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* mux in the signal to this channel
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* @addr: source/target address in physical memory for this DMA channel,
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* can be the address of a FIFO register for burst requests for example.
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* This can be left undefined if the PrimeCell API is used for configuring
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* this.
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* @single: the device connected to this channel will request single DMA
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* transfers, not bursts. (Bursts are default.)
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* @periph_buses: the device connected to this channel is accessible via
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* these buses (use PL08X_AHB1 | PL08X_AHB2).
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*/
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struct pl08x_channel_data {
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const char *bus_id;
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int min_signal;
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int max_signal;
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u32 muxval;
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dma_addr_t addr;
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bool single;
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u8 periph_buses;
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};
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enum pl08x_burst_size {
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PL08X_BURST_SZ_1,
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PL08X_BURST_SZ_4,
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PL08X_BURST_SZ_8,
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PL08X_BURST_SZ_16,
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PL08X_BURST_SZ_32,
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PL08X_BURST_SZ_64,
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PL08X_BURST_SZ_128,
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PL08X_BURST_SZ_256,
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};
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enum pl08x_bus_width {
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PL08X_BUS_WIDTH_8_BITS,
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PL08X_BUS_WIDTH_16_BITS,
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PL08X_BUS_WIDTH_32_BITS,
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};
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/**
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* struct pl08x_platform_data - the platform configuration for the PL08x
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* PrimeCells.
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* @slave_channels: the channels defined for the different devices on the
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* platform, all inclusive, including multiplexed channels. The available
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* physical channels will be multiplexed around these signals as they are
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* requested, just enumerate all possible channels.
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* @num_slave_channels: number of elements in the slave channel array
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* @memcpy_burst_size: the appropriate burst size for memcpy operations
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* @memcpy_bus_width: memory bus width
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* @memcpy_prot_buff: whether memcpy DMA is bufferable
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* @memcpy_prot_cache: whether memcpy DMA is cacheable
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* @get_xfer_signal: request a physical signal to be used for a DMA transfer
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* immediately: if there is some multiplexing or similar blocking the use
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* of the channel the transfer can be denied by returning less than zero,
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* else it returns the allocated signal number
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* @put_xfer_signal: indicate to the platform that this physical signal is not
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* running any DMA transfer and multiplexing can be recycled
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* @lli_buses: buses which LLIs can be fetched from: PL08X_AHB1 | PL08X_AHB2
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* @mem_buses: buses which memory can be accessed from: PL08X_AHB1 | PL08X_AHB2
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* @slave_map: DMA slave matching table
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* @slave_map_len: number of elements in @slave_map
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*/
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struct pl08x_platform_data {
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struct pl08x_channel_data *slave_channels;
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unsigned int num_slave_channels;
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enum pl08x_burst_size memcpy_burst_size;
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enum pl08x_bus_width memcpy_bus_width;
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bool memcpy_prot_buff;
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bool memcpy_prot_cache;
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int (*get_xfer_signal)(const struct pl08x_channel_data *);
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void (*put_xfer_signal)(const struct pl08x_channel_data *, int);
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u8 lli_buses;
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u8 mem_buses;
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const struct dma_slave_map *slave_map;
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int slave_map_len;
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};
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#ifdef CONFIG_AMBA_PL08X
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bool pl08x_filter_id(struct dma_chan *chan, void *chan_id);
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#else
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static inline bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
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{
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return false;
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}
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#endif
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#endif /* AMBA_PL08X_H */
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