drivers/dma/bestcomm/fec.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Bestcomm FEC tasks driver
   4  *
   5  * Copyright (C) 2006-2007 Sylvain Munaut <[email protected]>
   6  * Copyright (C) 2003-2004 MontaVista, Software, Inc.
   7  *                         ( by Dale Farnsworth <[email protected]> )
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <asm/io.h>
  14
  15 #include <linux/fsl/bestcomm/bestcomm.h>
  16 #include <linux/fsl/bestcomm/bestcomm_priv.h>
  17 #include <linux/fsl/bestcomm/fec.h>
  18
  19
  20 /* ======================================================================== */
  21 /* Task image/var/inc                                                       */
  22 /* ======================================================================== */
  23
  24 /* fec tasks images */
  25 extern u32 bcom_fec_rx_task[];
  26 extern u32 bcom_fec_tx_task[];
  27
  28 /* rx task vars that need to be set before enabling the task */
  29 struct bcom_fec_rx_var {
  30         u32 enable;             /* (u16*) address of task's control register */
  31         u32 fifo;               /* (u32*) address of fec's fifo */
  32         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  33         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  34         u32 bd_start;           /* (struct bcom_bd*) current bd */
  35         u32 buffer_size;        /* size of receive buffer */
  36 };
  37
  38 /* rx task incs that need to be set before enabling the task */
  39 struct bcom_fec_rx_inc {
  40         u16 pad0;
  41         s16 incr_bytes;
  42         u16 pad1;
  43         s16 incr_dst;
  44         u16 pad2;
  45         s16 incr_dst_ma;
  46 };
  47
  48 /* tx task vars that need to be set before enabling the task */
  49 struct bcom_fec_tx_var {
  50         u32 DRD;                /* (u32*) address of self-modified DRD */
  51         u32 fifo;               /* (u32*) address of fec's fifo */
  52         u32 enable;             /* (u16*) address of task's control register */
  53         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  54         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  55         u32 bd_start;           /* (struct bcom_bd*) current bd */
  56         u32 buffer_size;        /* set by uCode for each packet */
  57 };
  58
  59 /* tx task incs that need to be set before enabling the task */
  60 struct bcom_fec_tx_inc {
  61         u16 pad0;
  62         s16 incr_bytes;
  63         u16 pad1;
  64         s16 incr_src;
  65         u16 pad2;
  66         s16 incr_src_ma;
  67 };
  68
  69 /* private structure in the task */
  70 struct bcom_fec_priv {
  71         phys_addr_t     fifo;
  72         int             maxbufsize;
  73 };
  74
  75
  76 /* ======================================================================== */
  77 /* Task support code                                                        */
  78 /* ======================================================================== */
  79
  80 struct bcom_task *
  81 bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
  82 {
  83         struct bcom_task *tsk;
  84         struct bcom_fec_priv *priv;
  85
  86         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
  87                                 sizeof(struct bcom_fec_priv));
  88         if (!tsk)
  89                 return NULL;
  90
  91         tsk->flags = BCOM_FLAGS_NONE;
  92
  93         priv = tsk->priv;
  94         priv->fifo = fifo;
  95         priv->maxbufsize = maxbufsize;
  96
  97         if (bcom_fec_rx_reset(tsk)) {
  98                 bcom_task_free(tsk);
  99                 return NULL;
 100         }
 101
 102         return tsk;
 103 }
 104 EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
 105
 106 int
 107 bcom_fec_rx_reset(struct bcom_task *tsk)
 108 {
 109         struct bcom_fec_priv *priv = tsk->priv;
 110         struct bcom_fec_rx_var *var;
 111         struct bcom_fec_rx_inc *inc;
 112
 113         /* Shutdown the task */
 114         bcom_disable_task(tsk->tasknum);
 115
 116         /* Reset the microcode */
 117         var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
 118         inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);
 119
 120         if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
 121                 return -1;
 122
 123         var->enable     = bcom_eng->regs_base +
 124                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 125         var->fifo       = (u32) priv->fifo;
 126         var->bd_base    = tsk->bd_pa;
 127         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 128         var->bd_start   = tsk->bd_pa;
 129         var->buffer_size = priv->maxbufsize;
 130
 131         inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
 132         inc->incr_dst   = sizeof(u32);          /* task image, but we stick */
 133         inc->incr_dst_ma= sizeof(u8);           /* to the official ones     */
 134
 135         /* Reset the BDs */
 136         tsk->index = 0;
 137         tsk->outdex = 0;
 138
 139         memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 140
 141         /* Configure some stuff */
 142         bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
 143         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 144
 145         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
 146
 147         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 148
 149         return 0;
 150 }
 151 EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
 152
 153 void
 154 bcom_fec_rx_release(struct bcom_task *tsk)
 155 {
 156         /* Nothing special for the FEC tasks */
 157         bcom_task_free(tsk);
 158 }
 159 EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
 160
 161
 162
 163         /* Return 2nd to last DRD */
 164         /* This is an ugly hack, but at least it's only done
 165            once at initialization */
 166 static u32 *self_modified_drd(int tasknum)
 167 {
 168         u32 *desc;
 169         int num_descs;
 170         int drd_count;
 171         int i;
 172
 173         num_descs = bcom_task_num_descs(tasknum);
 174         desc = bcom_task_desc(tasknum) + num_descs - 1;
 175         drd_count = 0;
 176         for (i=0; i<num_descs; i++, desc--)
 177                 if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
 178                         break;
 179         return desc;
 180 }
 181
 182 struct bcom_task *
 183 bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
 184 {
 185         struct bcom_task *tsk;
 186         struct bcom_fec_priv *priv;
 187
 188         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
 189                                 sizeof(struct bcom_fec_priv));
 190         if (!tsk)
 191                 return NULL;
 192
 193         tsk->flags = BCOM_FLAGS_ENABLE_TASK;
 194
 195         priv = tsk->priv;
 196         priv->fifo = fifo;
 197
 198         if (bcom_fec_tx_reset(tsk)) {
 199                 bcom_task_free(tsk);
 200                 return NULL;
 201         }
 202
 203         return tsk;
 204 }
 205 EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
 206
 207 int
 208 bcom_fec_tx_reset(struct bcom_task *tsk)
 209 {
 210         struct bcom_fec_priv *priv = tsk->priv;
 211         struct bcom_fec_tx_var *var;
 212         struct bcom_fec_tx_inc *inc;
 213
 214         /* Shutdown the task */
 215         bcom_disable_task(tsk->tasknum);
 216
 217         /* Reset the microcode */
 218         var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
 219         inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);
 220
 221         if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
 222                 return -1;
 223
 224         var->enable     = bcom_eng->regs_base +
 225                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 226         var->fifo       = (u32) priv->fifo;
 227         var->DRD        = bcom_sram_va2pa(self_modified_drd(tsk->tasknum));
 228         var->bd_base    = tsk->bd_pa;
 229         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 230         var->bd_start   = tsk->bd_pa;
 231
 232         inc->incr_bytes = -(s16)sizeof(u32);    /* These should be in the   */
 233         inc->incr_src   = sizeof(u32);          /* task image, but we stick */
 234         inc->incr_src_ma= sizeof(u8);           /* to the official ones     */
 235
 236         /* Reset the BDs */
 237         tsk->index = 0;
 238         tsk->outdex = 0;
 239
 240         memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 241
 242         /* Configure some stuff */
 243         bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
 244         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 245
 246         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
 247
 248         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 249
 250         return 0;
 251 }
 252 EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
 253
 254 void
 255 bcom_fec_tx_release(struct bcom_task *tsk)
 256 {
 257         /* Nothing special for the FEC tasks */
 258         bcom_task_free(tsk);
 259 }
 260 EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
 261
 262
 263 MODULE_DESCRIPTION("BestComm FEC tasks driver");
 264 MODULE_AUTHOR("Dale Farnsworth <[email protected]>");
 265 MODULE_LICENSE("GPL v2");