125 lines
4 KiB
C
125 lines
4 KiB
C
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/*
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* Texas Instruments CPDMA Driver
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*
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* Copyright (C) 2010 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __DAVINCI_CPDMA_H__
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#define __DAVINCI_CPDMA_H__
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#define CPDMA_MAX_CHANNELS BITS_PER_LONG
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#define CPDMA_RX_SOURCE_PORT(__status__) ((__status__ >> 16) & 0x7)
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#define CPDMA_RX_VLAN_ENCAP BIT(19)
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#define CPDMA_EOI_RX_THRESH 0x0
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#define CPDMA_EOI_RX 0x1
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#define CPDMA_EOI_TX 0x2
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#define CPDMA_EOI_MISC 0x3
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struct cpdma_params {
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struct device *dev;
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void __iomem *dmaregs;
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void __iomem *txhdp, *rxhdp, *txcp, *rxcp;
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void __iomem *rxthresh, *rxfree;
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int num_chan;
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bool has_soft_reset;
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int min_packet_size;
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u32 desc_mem_phys;
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u32 desc_hw_addr;
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int desc_mem_size;
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int desc_align;
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u32 bus_freq_mhz;
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u32 descs_pool_size;
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/*
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* Some instances of embedded cpdma controllers have extra control and
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* status registers. The following flag enables access to these
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* "extended" registers.
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*/
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bool has_ext_regs;
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};
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struct cpdma_chan_stats {
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u32 head_enqueue;
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u32 tail_enqueue;
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u32 pad_enqueue;
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u32 misqueued;
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u32 desc_alloc_fail;
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u32 pad_alloc_fail;
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u32 runt_receive_buff;
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u32 runt_transmit_buff;
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u32 empty_dequeue;
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u32 busy_dequeue;
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u32 good_dequeue;
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u32 requeue;
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u32 teardown_dequeue;
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};
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struct cpdma_ctlr;
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struct cpdma_chan;
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typedef void (*cpdma_handler_fn)(void *token, int len, int status);
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struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
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int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
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int cpdma_ctlr_start(struct cpdma_ctlr *ctlr);
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int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr);
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struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
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cpdma_handler_fn handler, int rx_type);
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int cpdma_chan_get_rx_buf_num(struct cpdma_chan *chan);
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int cpdma_chan_destroy(struct cpdma_chan *chan);
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int cpdma_chan_start(struct cpdma_chan *chan);
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int cpdma_chan_stop(struct cpdma_chan *chan);
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int cpdma_chan_get_stats(struct cpdma_chan *chan,
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struct cpdma_chan_stats *stats);
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int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
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int len, int directed);
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int cpdma_chan_process(struct cpdma_chan *chan, int quota);
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int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable);
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void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value);
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int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable);
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u32 cpdma_ctrl_rxchs_state(struct cpdma_ctlr *ctlr);
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u32 cpdma_ctrl_txchs_state(struct cpdma_ctlr *ctlr);
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bool cpdma_check_free_tx_desc(struct cpdma_chan *chan);
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int cpdma_chan_set_weight(struct cpdma_chan *ch, int weight);
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int cpdma_chan_set_rate(struct cpdma_chan *ch, u32 rate);
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u32 cpdma_chan_get_rate(struct cpdma_chan *ch);
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u32 cpdma_chan_get_min_rate(struct cpdma_ctlr *ctlr);
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enum cpdma_control {
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CPDMA_TX_RLIM, /* read-write */
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CPDMA_CMD_IDLE, /* write-only */
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CPDMA_COPY_ERROR_FRAMES, /* read-write */
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CPDMA_RX_OFF_LEN_UPDATE, /* read-write */
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CPDMA_RX_OWNERSHIP_FLIP, /* read-write */
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CPDMA_TX_PRIO_FIXED, /* read-write */
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CPDMA_STAT_IDLE, /* read-only */
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CPDMA_STAT_TX_ERR_CHAN, /* read-only */
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CPDMA_STAT_TX_ERR_CODE, /* read-only */
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CPDMA_STAT_RX_ERR_CHAN, /* read-only */
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CPDMA_STAT_RX_ERR_CODE, /* read-only */
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CPDMA_RX_BUFFER_OFFSET, /* read-write */
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};
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int cpdma_control_get(struct cpdma_ctlr *ctlr, int control);
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int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value);
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int cpdma_get_num_rx_descs(struct cpdma_ctlr *ctlr);
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void cpdma_set_num_rx_descs(struct cpdma_ctlr *ctlr, int num_rx_desc);
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int cpdma_get_num_tx_descs(struct cpdma_ctlr *ctlr);
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int cpdma_chan_split_pool(struct cpdma_ctlr *ctlr);
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#endif
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