131 lines · c
1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver4 *5 * Copyright (C) 2005 ARM Ltd6 * Copyright (C) 2010 ST-Ericsson SA7 *8 * pl08x information required by platform code9 *10 * Please credit ARM.com11 * Documentation: ARM DDI 0196D12 */13 14#ifndef AMBA_PL08X_H15#define AMBA_PL08X_H16 17/* We need sizes of structs from this header */18#include <linux/dmaengine.h>19#include <linux/interrupt.h>20 21struct pl08x_driver_data;22struct pl08x_phy_chan;23struct pl08x_txd;24 25/* Bitmasks for selecting AHB ports for DMA transfers */26enum {27 PL08X_AHB1 = (1 << 0),28 PL08X_AHB2 = (1 << 1)29};30 31/**32 * struct pl08x_channel_data - data structure to pass info between33 * platform and PL08x driver regarding channel configuration34 * @bus_id: name of this device channel, not just a device name since35 * devices may have more than one channel e.g. "foo_tx"36 * @min_signal: the minimum DMA signal number to be muxed in for this37 * channel (for platforms supporting muxed signals). If you have38 * static assignments, make sure this is set to the assigned signal39 * number, PL08x have 16 possible signals in number 0 thru 15 so40 * when these are not enough they often get muxed (in hardware)41 * disabling simultaneous use of the same channel for two devices.42 * @max_signal: the maximum DMA signal number to be muxed in for43 * the channel. Set to the same as min_signal for44 * devices with static assignments45 * @muxval: a number usually used to poke into some mux regiser to46 * mux in the signal to this channel47 * @addr: source/target address in physical memory for this DMA channel,48 * can be the address of a FIFO register for burst requests for example.49 * This can be left undefined if the PrimeCell API is used for configuring50 * this.51 * @single: the device connected to this channel will request single DMA52 * transfers, not bursts. (Bursts are default.)53 * @periph_buses: the device connected to this channel is accessible via54 * these buses (use PL08X_AHB1 | PL08X_AHB2).55 */56struct pl08x_channel_data {57 const char *bus_id;58 int min_signal;59 int max_signal;60 u32 muxval;61 dma_addr_t addr;62 bool single;63 u8 periph_buses;64};65 66enum pl08x_burst_size {67 PL08X_BURST_SZ_1,68 PL08X_BURST_SZ_4,69 PL08X_BURST_SZ_8,70 PL08X_BURST_SZ_16,71 PL08X_BURST_SZ_32,72 PL08X_BURST_SZ_64,73 PL08X_BURST_SZ_128,74 PL08X_BURST_SZ_256,75};76 77enum pl08x_bus_width {78 PL08X_BUS_WIDTH_8_BITS,79 PL08X_BUS_WIDTH_16_BITS,80 PL08X_BUS_WIDTH_32_BITS,81};82 83/**84 * struct pl08x_platform_data - the platform configuration for the PL08x85 * PrimeCells.86 * @slave_channels: the channels defined for the different devices on the87 * platform, all inclusive, including multiplexed channels. The available88 * physical channels will be multiplexed around these signals as they are89 * requested, just enumerate all possible channels.90 * @num_slave_channels: number of elements in the slave channel array91 * @memcpy_burst_size: the appropriate burst size for memcpy operations92 * @memcpy_bus_width: memory bus width93 * @memcpy_prot_buff: whether memcpy DMA is bufferable94 * @memcpy_prot_cache: whether memcpy DMA is cacheable95 * @get_xfer_signal: request a physical signal to be used for a DMA transfer96 * immediately: if there is some multiplexing or similar blocking the use97 * of the channel the transfer can be denied by returning less than zero,98 * else it returns the allocated signal number99 * @put_xfer_signal: indicate to the platform that this physical signal is not100 * running any DMA transfer and multiplexing can be recycled101 * @lli_buses: buses which LLIs can be fetched from: PL08X_AHB1 | PL08X_AHB2102 * @mem_buses: buses which memory can be accessed from: PL08X_AHB1 | PL08X_AHB2103 * @slave_map: DMA slave matching table104 * @slave_map_len: number of elements in @slave_map105 */106struct pl08x_platform_data {107 struct pl08x_channel_data *slave_channels;108 unsigned int num_slave_channels;109 enum pl08x_burst_size memcpy_burst_size;110 enum pl08x_bus_width memcpy_bus_width;111 bool memcpy_prot_buff;112 bool memcpy_prot_cache;113 int (*get_xfer_signal)(const struct pl08x_channel_data *);114 void (*put_xfer_signal)(const struct pl08x_channel_data *, int);115 u8 lli_buses;116 u8 mem_buses;117 const struct dma_slave_map *slave_map;118 int slave_map_len;119};120 121#ifdef CONFIG_AMBA_PL08X122bool pl08x_filter_id(struct dma_chan *chan, void *chan_id);123#else124static inline bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)125{126 return false;127}128#endif129 130#endif /* AMBA_PL08X_H */131