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linux-headers-6.8.0-101-generic
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amba
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pl08x.h
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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 */