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Diffstat (limited to 'kernel/include/linux/amba/pl08x.h')
| -rw-r--r-- | kernel/include/linux/amba/pl08x.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/kernel/include/linux/amba/pl08x.h b/kernel/include/linux/amba/pl08x.h new file mode 100644 index 000000000..10fe2a211 --- /dev/null +++ b/kernel/include/linux/amba/pl08x.h @@ -0,0 +1,107 @@ +/* + * 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 + * @cctl_memcpy: options for the channel control register for memcpy + * *** not used for slave channels *** + * @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; + u32 cctl_memcpy; + dma_addr_t addr; + bool single; + u8 periph_buses; +}; + +/** + * 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. + * @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 + */ +struct pl08x_platform_data { + const struct pl08x_channel_data *slave_channels; + unsigned int num_slave_channels; + struct pl08x_channel_data memcpy_channel; + 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; +}; + +#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 */ |