| /* | |
| * 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 */ |