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- /*
- * Texas Instruments CPDMA Driver
- *
- * Copyright (C) 2010 Texas Instruments
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #ifndef __DAVINCI_CPDMA_H__
- #define __DAVINCI_CPDMA_H__
- #define CPDMA_MAX_CHANNELS BITS_PER_LONG
- #define tx_chan_num(chan) (chan)
- #define rx_chan_num(chan) ((chan) + CPDMA_MAX_CHANNELS)
- #define is_rx_chan(chan) ((chan)->chan_num >= CPDMA_MAX_CHANNELS)
- #define is_tx_chan(chan) (!is_rx_chan(chan))
- #define __chan_linear(chan_num) ((chan_num) & (CPDMA_MAX_CHANNELS - 1))
- #define chan_linear(chan) __chan_linear((chan)->chan_num)
- #define CPDMA_RX_SOURCE_PORT(__status__) ((__status__ >> 16) & 0x7)
- #define CPDMA_EOI_RX_THRESH 0x0
- #define CPDMA_EOI_RX 0x1
- #define CPDMA_EOI_TX 0x2
- #define CPDMA_EOI_MISC 0x3
- struct cpdma_params {
- struct device *dev;
- void __iomem *dmaregs;
- void __iomem *txhdp, *rxhdp, *txcp, *rxcp;
- void __iomem *rxthresh, *rxfree;
- int num_chan;
- bool has_soft_reset;
- int min_packet_size;
- u32 desc_mem_phys;
- u32 desc_hw_addr;
- int desc_mem_size;
- int desc_align;
- /*
- * Some instances of embedded cpdma controllers have extra control and
- * status registers. The following flag enables access to these
- * "extended" registers.
- */
- bool has_ext_regs;
- };
- struct cpdma_chan_stats {
- u32 head_enqueue;
- u32 tail_enqueue;
- u32 pad_enqueue;
- u32 misqueued;
- u32 desc_alloc_fail;
- u32 pad_alloc_fail;
- u32 runt_receive_buff;
- u32 runt_transmit_buff;
- u32 empty_dequeue;
- u32 busy_dequeue;
- u32 good_dequeue;
- u32 requeue;
- u32 teardown_dequeue;
- };
- struct cpdma_ctlr;
- struct cpdma_chan;
- typedef void (*cpdma_handler_fn)(void *token, int len, int status);
- struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
- int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
- int cpdma_ctlr_start(struct cpdma_ctlr *ctlr);
- int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr);
- int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr);
- struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
- cpdma_handler_fn handler);
- int cpdma_chan_destroy(struct cpdma_chan *chan);
- int cpdma_chan_start(struct cpdma_chan *chan);
- int cpdma_chan_stop(struct cpdma_chan *chan);
- int cpdma_chan_dump(struct cpdma_chan *chan);
- int cpdma_chan_get_stats(struct cpdma_chan *chan,
- struct cpdma_chan_stats *stats);
- int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
- int len, int directed);
- int cpdma_chan_process(struct cpdma_chan *chan, int quota);
- int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable);
- void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value);
- int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable);
- bool cpdma_check_free_tx_desc(struct cpdma_chan *chan);
- enum cpdma_control {
- CPDMA_CMD_IDLE, /* write-only */
- CPDMA_COPY_ERROR_FRAMES, /* read-write */
- CPDMA_RX_OFF_LEN_UPDATE, /* read-write */
- CPDMA_RX_OWNERSHIP_FLIP, /* read-write */
- CPDMA_TX_PRIO_FIXED, /* read-write */
- CPDMA_STAT_IDLE, /* read-only */
- CPDMA_STAT_TX_ERR_CHAN, /* read-only */
- CPDMA_STAT_TX_ERR_CODE, /* read-only */
- CPDMA_STAT_RX_ERR_CHAN, /* read-only */
- CPDMA_STAT_RX_ERR_CODE, /* read-only */
- CPDMA_RX_BUFFER_OFFSET, /* read-write */
- };
- int cpdma_control_get(struct cpdma_ctlr *ctlr, int control);
- int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value);
- #endif
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