kernel/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 */
  29 extern u32 bcom_fec_rx_task[];
  30 extern u32 bcom_fec_tx_task[];
  31
  32 /* rx task vars that need to be set before enabling the task */
  33 struct 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 */
  43 struct 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 */
  53 struct 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 */
  64 struct 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 */
  74 struct bcom_fec_priv {
  75         phys_addr_t     fifo;
  76         int             maxbufsize;
  77 };
  78
  79
  80 /* ======================================================================== */
  81 /* Task support code                                                        */
  82 /* ======================================================================== */
  83
  84 struct bcom_task *
  85 bcom_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 }
 108 EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
 109
 110 int
 111 bcom_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 }
 155 EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
 156
 157 void
 158 bcom_fec_rx_release(struct bcom_task *tsk)
 159 {
 160         /* Nothing special for the FEC tasks */
 161         bcom_task_free(tsk);
 162 }
 163 EXPORT_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 */
 170 static 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
 186 struct bcom_task *
 187 bcom_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 }
 209 EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
 210
 211 int
 212 bcom_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 }
 256 EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
 257
 258 void
 259 bcom_fec_tx_release(struct bcom_task *tsk)
 260 {
 261         /* Nothing special for the FEC tasks */
 262         bcom_task_free(tsk);
 263 }
 264 EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
 265
 266
 267 MODULE_DESCRIPTION("BestComm FEC tasks driver");
 268 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
 269 MODULE_LICENSE("GPL v2");
 270