1 /* 2 * linux/amba/pl08x.h - ARM PrimeCell DMA Controller driver 3 * 4 * Copyright (C) 2005 ARM Ltd 5 * Copyright (C) 2010 ST-Ericsson SA 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * pl08x information required by platform code 12 * 13 * Please credit ARM.com 14 * Documentation: ARM DDI 0196D 15 */ 16 17 #ifndef AMBA_PL08X_H 18 #define AMBA_PL08X_H 19 20 /* We need sizes of structs from this header */ 21 #include <linux/dmaengine.h> 22 #include <linux/interrupt.h> 23 24 struct pl08x_driver_data; 25 struct pl08x_phy_chan; 26 struct pl08x_txd; 27 28 /* Bitmasks for selecting AHB ports for DMA transfers */ 29 enum { 30 PL08X_AHB1 = (1 << 0), 31 PL08X_AHB2 = (1 << 1) 32 }; 33 34 /** 35 * struct pl08x_channel_data - data structure to pass info between 36 * platform and PL08x driver regarding channel configuration 37 * @bus_id: name of this device channel, not just a device name since 38 * devices may have more than one channel e.g. "foo_tx" 39 * @min_signal: the minimum DMA signal number to be muxed in for this 40 * channel (for platforms supporting muxed signals). If you have 41 * static assignments, make sure this is set to the assigned signal 42 * number, PL08x have 16 possible signals in number 0 thru 15 so 43 * when these are not enough they often get muxed (in hardware) 44 * disabling simultaneous use of the same channel for two devices. 45 * @max_signal: the maximum DMA signal number to be muxed in for 46 * the channel. Set to the same as min_signal for 47 * devices with static assignments 48 * @muxval: a number usually used to poke into some mux regiser to 49 * mux in the signal to this channel 50 * @addr: source/target address in physical memory for this DMA channel, 51 * can be the address of a FIFO register for burst requests for example. 52 * This can be left undefined if the PrimeCell API is used for configuring 53 * this. 54 * @single: the device connected to this channel will request single DMA 55 * transfers, not bursts. (Bursts are default.) 56 * @periph_buses: the device connected to this channel is accessible via 57 * these buses (use PL08X_AHB1 | PL08X_AHB2). 58 */ 59 struct pl08x_channel_data { 60 const char *bus_id; 61 int min_signal; 62 int max_signal; 63 u32 muxval; 64 dma_addr_t addr; 65 bool single; 66 u8 periph_buses; 67 }; 68 69 enum pl08x_burst_size { 70 PL08X_BURST_SZ_1, 71 PL08X_BURST_SZ_4, 72 PL08X_BURST_SZ_8, 73 PL08X_BURST_SZ_16, 74 PL08X_BURST_SZ_32, 75 PL08X_BURST_SZ_64, 76 PL08X_BURST_SZ_128, 77 PL08X_BURST_SZ_256, 78 }; 79 80 enum pl08x_bus_width { 81 PL08X_BUS_WIDTH_8_BITS, 82 PL08X_BUS_WIDTH_16_BITS, 83 PL08X_BUS_WIDTH_32_BITS, 84 }; 85 86 /** 87 * struct pl08x_platform_data - the platform configuration for the PL08x 88 * PrimeCells. 89 * @slave_channels: the channels defined for the different devices on the 90 * platform, all inclusive, including multiplexed channels. The available 91 * physical channels will be multiplexed around these signals as they are 92 * requested, just enumerate all possible channels. 93 * @num_slave_channels: number of elements in the slave channel array 94 * @memcpy_burst_size: the appropriate burst size for memcpy operations 95 * @memcpy_bus_width: memory bus width 96 * @memcpy_prot_buff: whether memcpy DMA is bufferable 97 * @memcpy_prot_cache: whether memcpy DMA is cacheable 98 * @get_xfer_signal: request a physical signal to be used for a DMA transfer 99 * immediately: if there is some multiplexing or similar blocking the use 100 * of the channel the transfer can be denied by returning less than zero, 101 * else it returns the allocated signal number 102 * @put_xfer_signal: indicate to the platform that this physical signal is not 103 * running any DMA transfer and multiplexing can be recycled 104 * @lli_buses: buses which LLIs can be fetched from: PL08X_AHB1 | PL08X_AHB2 105 * @mem_buses: buses which memory can be accessed from: PL08X_AHB1 | PL08X_AHB2 106 * @slave_map: DMA slave matching table 107 * @slave_map_len: number of elements in @slave_map 108 */ 109 struct pl08x_platform_data { 110 struct pl08x_channel_data *slave_channels; 111 unsigned int num_slave_channels; 112 enum pl08x_burst_size memcpy_burst_size; 113 enum pl08x_bus_width memcpy_bus_width; 114 bool memcpy_prot_buff; 115 bool memcpy_prot_cache; 116 int (*get_xfer_signal)(const struct pl08x_channel_data *); 117 void (*put_xfer_signal)(const struct pl08x_channel_data *, int); 118 u8 lli_buses; 119 u8 mem_buses; 120 const struct dma_slave_map *slave_map; 121 int slave_map_len; 122 }; 123 124 #ifdef CONFIG_AMBA_PL08X 125 bool pl08x_filter_id(struct dma_chan *chan, void *chan_id); 126 #else 127 static inline bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) 128 { 129 return false; 130 } 131 #endif 132 133 #endif /* AMBA_PL08X_H */ 134