LXR linux/drivers/dma/bestcomm/fec.c

   1/*
   2 * Bestcomm FEC tasks driver
   3 *
   4 *
   5 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
   6 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
   7 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
   8 *
   9 * This file is licensed under the terms of the GNU General Public License
  10 * version 2. This program is licensed "as is" without any warranty of any
  11 * kind, whether express or implied.
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/types.h>
  17#include <asm/io.h>
  18
  19#include <linux/fsl/bestcomm/bestcomm.h>
  20#include <linux/fsl/bestcomm/bestcomm_priv.h>
  21#include <linux/fsl/bestcomm/fec.h>
  22
  23
  24/* ======================================================================== */
  25/* Task image/var/inc                                                       */
  26/* ======================================================================== */
  27
  28/* fec tasks images */
  29extern u32 bcom_fec_rx_task[];
  30extern u32 bcom_fec_tx_task[];
  31
  32/* rx task vars that need to be set before enabling the task */
  33struct bcom_fec_rx_var {
  34        u32 enable;             /* (u16*) address of task's control register */
  35        u32 fifo;               /* (u32*) address of fec's fifo */
  36        u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  37        u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  38        u32 bd_start;           /* (struct bcom_bd*) current bd */
  39        u32 buffer_size;        /* size of receive buffer */
  40};
  41
  42/* rx task incs that need to be set before enabling the task */
  43struct bcom_fec_rx_inc {
  44        u16 pad0;
  45        s16 incr_bytes;
  46        u16 pad1;
  47        s16 incr_dst;
  48        u16 pad2;
  49        s16 incr_dst_ma;
  50};
  51
  52/* tx task vars that need to be set before enabling the task */
  53struct bcom_fec_tx_var {
  54        u32 DRD;                /* (u32*) address of self-modified DRD */
  55        u32 fifo;               /* (u32*) address of fec's fifo */
  56        u32 enable;             /* (u16*) address of task's control register */
  57        u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  58        u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  59        u32 bd_start;           /* (struct bcom_bd*) current bd */
  60        u32 buffer_size;        /* set by uCode for each packet */
  61};
  62
  63/* tx task incs that need to be set before enabling the task */
  64struct bcom_fec_tx_inc {
  65        u16 pad0;
  66        s16 incr_bytes;
  67        u16 pad1;
  68        s16 incr_src;
  69        u16 pad2;
  70        s16 incr_src_ma;
  71};
  72
  73/* private structure in the task */
  74struct bcom_fec_priv {
  75        phys_addr_t     fifo;
  76        int             maxbufsize;
  77};
  78
  79
  80/* ======================================================================== */
  81/* Task support code                                                        */
  82/* ======================================================================== */
  83
  84struct bcom_task *
  85bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
  86{
  87        struct bcom_task *tsk;
  88        struct bcom_fec_priv *priv;
  89
  90        tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
  91                                sizeof(struct bcom_fec_priv));
  92        if (!tsk)
  93                return NULL;
  94
  95        tsk->flags = BCOM_FLAGS_NONE;
  96
  97        priv = tsk->priv;
  98        priv->fifo = fifo;
  99        priv->maxbufsize = maxbufsize;
 100
 101        if (bcom_fec_rx_reset(tsk)) {
 102                bcom_task_free(tsk);
 103                return NULL;
 104        }
 105
 106        return tsk;
 107}
 108EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
 109
 110int
 111bcom_fec_rx_reset(struct bcom_task *tsk)
 112{
 113        struct bcom_fec_priv *priv = tsk->priv;
 114        struct bcom_fec_rx_var *var;
 115        struct bcom_fec_rx_inc *inc;
 116
 117        /* Shutdown the task */
 118        bcom_disable_task(tsk->tasknum);
 119
 120        /* Reset the microcode */
 121        var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
 122        inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);
 123
 124        if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
 125                return -1;
 126
 127        var->enable     = bcom_eng->regs_base +
 128                                offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 129        var->fifo       = (u32) priv->fifo;
 130        var->bd_base    = tsk->bd_pa;
 131        var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 132        var->bd_start   = tsk->bd_pa;
 133        var->buffer_size = priv->maxbufsize;
 134
 135        inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
 136        inc->incr_dst   = sizeof(u32);          /* task image, but we stick */
 137        inc->incr_dst_ma= sizeof(u8);           /* to the official ones     */
 138
 139        /* Reset the BDs */
 140        tsk->index = 0;
 141        tsk->outdex = 0;
 142
 143        memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 144
 145        /* Configure some stuff */
 146        bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
 147        bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 148
 149        out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
 150
 151        out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 152
 153        return 0;
 154}
 155EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
 156
 157void
 158bcom_fec_rx_release(struct bcom_task *tsk)
 159{
 160        /* Nothing special for the FEC tasks */
 161        bcom_task_free(tsk);
 162}
 163EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
 164
 165
 166
 167        /* Return 2nd to last DRD */
 168        /* This is an ugly hack, but at least it's only done
 169           once at initialization */
 170static u32 *self_modified_drd(int tasknum)
 171{
 172        u32 *desc;
 173        int num_descs;
 174        int drd_count;
 175        int i;
 176
 177        num_descs = bcom_task_num_descs(tasknum);
 178        desc = bcom_task_desc(tasknum) + num_descs - 1;
 179        drd_count = 0;
 180        for (i=0; i<num_descs; i++, desc--)
 181                if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
 182                        break;
 183        return desc;
 184}
 185
 186struct bcom_task *
 187bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
 188{
 189        struct bcom_task *tsk;
 190        struct bcom_fec_priv *priv;
 191
 192        tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
 193                                sizeof(struct bcom_fec_priv));
 194        if (!tsk)
 195                return NULL;
 196
 197        tsk->flags = BCOM_FLAGS_ENABLE_TASK;
 198
 199        priv = tsk->priv;
 200        priv->fifo = fifo;
 201
 202        if (bcom_fec_tx_reset(tsk)) {
 203                bcom_task_free(tsk);
 204                return NULL;
 205        }
 206
 207        return tsk;
 208}
 209EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
 210
 211int
 212bcom_fec_tx_reset(struct bcom_task *tsk)
 213{
 214        struct bcom_fec_priv *priv = tsk->priv;
 215        struct bcom_fec_tx_var *var;
 216        struct bcom_fec_tx_inc *inc;
 217
 218        /* Shutdown the task */
 219        bcom_disable_task(tsk->tasknum);
 220
 221        /* Reset the microcode */
 222        var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
 223        inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);
 224
 225        if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
 226                return -1;
 227
 228        var->enable     = bcom_eng->regs_base +
 229                                offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 230        var->fifo       = (u32) priv->fifo;
 231        var->DRD        = bcom_sram_va2pa(self_modified_drd(tsk->tasknum));
 232        var->bd_base    = tsk->bd_pa;
 233        var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 234        var->bd_start   = tsk->bd_pa;
 235
 236        inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
 237        inc->incr_src   = sizeof(u32);          /* task image, but we stick */
 238        inc->incr_src_ma= sizeof(u8);           /* to the official ones     */
 239
 240        /* Reset the BDs */
 241        tsk->index = 0;
 242        tsk->outdex = 0;
 243
 244        memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 245
 246        /* Configure some stuff */
 247        bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
 248        bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 249
 250        out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
 251
 252        out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 253
 254        return 0;
 255}
 256EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
 257
 258void
 259bcom_fec_tx_release(struct bcom_task *tsk)
 260{
 261        /* Nothing special for the FEC tasks */
 262        bcom_task_free(tsk);
 263}
 264EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
 265
 266
 267MODULE_DESCRIPTION("BestComm FEC tasks driver");
 268MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
 269MODULE_LICENSE("GPL v2");
 270
 271