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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver
- *
- * Copyright (C) 2005 ARM Ltd
- * Copyright (C) 2010 ST-Ericsson SA
- *
- * 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 */
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