drivers/net/davinci_cpdma.h

   1 /*
   2  * Texas Instruments CPDMA Driver
   3  *
   4  * Copyright (C) 2010 Texas Instruments
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #ifndef __DAVINCI_CPDMA_H__
  16 #define __DAVINCI_CPDMA_H__
  17
  18 #define CPDMA_MAX_CHANNELS      BITS_PER_LONG
  19
  20 #define tx_chan_num(chan)       (chan)
  21 #define rx_chan_num(chan)       ((chan) + CPDMA_MAX_CHANNELS)
  22 #define is_rx_chan(chan)        ((chan)->chan_num >= CPDMA_MAX_CHANNELS)
  23 #define is_tx_chan(chan)        (!is_rx_chan(chan))
  24 #define __chan_linear(chan_num) ((chan_num) & (CPDMA_MAX_CHANNELS - 1))
  25 #define chan_linear(chan)       __chan_linear((chan)->chan_num)
  26
  27 struct cpdma_params {
  28         struct device           *dev;
  29         void __iomem            *dmaregs;
  30         void __iomem            *txhdp, *rxhdp, *txcp, *rxcp;
  31         void __iomem            *rxthresh, *rxfree;
  32         int                     num_chan;
  33         bool                    has_soft_reset;
  34         int                     min_packet_size;
  35         u32                     desc_mem_phys;
  36         u32                     desc_hw_addr;
  37         int                     desc_mem_size;
  38         int                     desc_align;
  39
  40         /*
  41          * Some instances of embedded cpdma controllers have extra control and
  42          * status registers.  The following flag enables access to these
  43          * "extended" registers.
  44          */
  45         bool                    has_ext_regs;
  46 };
  47
  48 struct cpdma_chan_stats {
  49         u32                     head_enqueue;
  50         u32                     tail_enqueue;
  51         u32                     pad_enqueue;
  52         u32                     misqueued;
  53         u32                     desc_alloc_fail;
  54         u32                     pad_alloc_fail;
  55         u32                     runt_receive_buff;
  56         u32                     runt_transmit_buff;
  57         u32                     empty_dequeue;
  58         u32                     busy_dequeue;
  59         u32                     good_dequeue;
  60         u32                     requeue;
  61         u32                     teardown_dequeue;
  62 };
  63
  64 struct cpdma_ctlr;
  65 struct cpdma_chan;
  66
  67 typedef void (*cpdma_handler_fn)(void *token, int len, int status);
  68
  69 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params);
  70 int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr);
  71 int cpdma_ctlr_start(struct cpdma_ctlr *ctlr);
  72 int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr);
  73 int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr);
  74
  75 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
  76                                      cpdma_handler_fn handler);
  77 int cpdma_chan_destroy(struct cpdma_chan *chan);
  78 int cpdma_chan_start(struct cpdma_chan *chan);
  79 int cpdma_chan_stop(struct cpdma_chan *chan);
  80 int cpdma_chan_dump(struct cpdma_chan *chan);
  81
  82 int cpdma_chan_get_stats(struct cpdma_chan *chan,
  83                          struct cpdma_chan_stats *stats);
  84 int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
  85                       int len, gfp_t gfp_mask);
  86 int cpdma_chan_process(struct cpdma_chan *chan, int quota);
  87
  88 int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable);
  89 void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr);
  90 int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable);
  91
  92 enum cpdma_control {
  93         CPDMA_CMD_IDLE,                 /* write-only */
  94         CPDMA_COPY_ERROR_FRAMES,        /* read-write */
  95         CPDMA_RX_OFF_LEN_UPDATE,        /* read-write */
  96         CPDMA_RX_OWNERSHIP_FLIP,        /* read-write */
  97         CPDMA_TX_PRIO_FIXED,            /* read-write */
  98         CPDMA_STAT_IDLE,                /* read-only */
  99         CPDMA_STAT_TX_ERR_CHAN,         /* read-only */
 100         CPDMA_STAT_TX_ERR_CODE,         /* read-only */
 101         CPDMA_STAT_RX_ERR_CHAN,         /* read-only */
 102         CPDMA_STAT_RX_ERR_CODE,         /* read-only */
 103         CPDMA_RX_BUFFER_OFFSET,         /* read-write */
 104 };
 105
 106 int cpdma_control_get(struct cpdma_ctlr *ctlr, int control);
 107 int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value);
 108
 109 #endif