davinci_cpdma.h
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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;
u32 descs_pool_size;
/*
* 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_get_rx_buf_num(struct cpdma_ctlr *ctlr);
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