drivers/dma/bestcomm/gen_bd.c

   1 /*
   2  * Driver for MPC52xx processor BestComm General Buffer Descriptor
   3  *
   4  * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
   5  * Copyright (C) 2006 AppSpec Computer Technologies Corp.
   6  *                    Jeff Gibbons <jeff.gibbons@appspec.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published
  10  * by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18 #include <asm/errno.h>
  19 #include <asm/io.h>
  20
  21 #include <asm/mpc52xx.h>
  22 #include <asm/mpc52xx_psc.h>
  23
  24 #include <linux/fsl/bestcomm/bestcomm.h>
  25 #include <linux/fsl/bestcomm/bestcomm_priv.h>
  26 #include <linux/fsl/bestcomm/gen_bd.h>
  27
  28
  29 /* ======================================================================== */
  30 /* Task image/var/inc                                                       */
  31 /* ======================================================================== */
  32
  33 /* gen_bd tasks images */
  34 extern u32 bcom_gen_bd_rx_task[];
  35 extern u32 bcom_gen_bd_tx_task[];
  36
  37 /* rx task vars that need to be set before enabling the task */
  38 struct bcom_gen_bd_rx_var {
  39         u32 enable;             /* (u16*) address of task's control register */
  40         u32 fifo;               /* (u32*) address of gen_bd's fifo */
  41         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  42         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  43         u32 bd_start;           /* (struct bcom_bd*) current bd */
  44         u32 buffer_size;        /* size of receive buffer */
  45 };
  46
  47 /* rx task incs that need to be set before enabling the task */
  48 struct bcom_gen_bd_rx_inc {
  49         u16 pad0;
  50         s16 incr_bytes;
  51         u16 pad1;
  52         s16 incr_dst;
  53 };
  54
  55 /* tx task vars that need to be set before enabling the task */
  56 struct bcom_gen_bd_tx_var {
  57         u32 fifo;               /* (u32*) address of gen_bd's fifo */
  58         u32 enable;             /* (u16*) address of task's control register */
  59         u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
  60         u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
  61         u32 bd_start;           /* (struct bcom_bd*) current bd */
  62         u32 buffer_size;        /* set by uCode for each packet */
  63 };
  64
  65 /* tx task incs that need to be set before enabling the task */
  66 struct bcom_gen_bd_tx_inc {
  67         u16 pad0;
  68         s16 incr_bytes;
  69         u16 pad1;
  70         s16 incr_src;
  71         u16 pad2;
  72         s16 incr_src_ma;
  73 };
  74
  75 /* private structure */
  76 struct bcom_gen_bd_priv {
  77         phys_addr_t     fifo;
  78         int             initiator;
  79         int             ipr;
  80         int             maxbufsize;
  81 };
  82
  83
  84 /* ======================================================================== */
  85 /* Task support code                                                        */
  86 /* ======================================================================== */
  87
  88 struct bcom_task *
  89 bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo,
  90                         int initiator, int ipr, int maxbufsize)
  91 {
  92         struct bcom_task *tsk;
  93         struct bcom_gen_bd_priv *priv;
  94
  95         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
  96                         sizeof(struct bcom_gen_bd_priv));
  97         if (!tsk)
  98                 return NULL;
  99
 100         tsk->flags = BCOM_FLAGS_NONE;
 101
 102         priv = tsk->priv;
 103         priv->fifo      = fifo;
 104         priv->initiator = initiator;
 105         priv->ipr       = ipr;
 106         priv->maxbufsize = maxbufsize;
 107
 108         if (bcom_gen_bd_rx_reset(tsk)) {
 109                 bcom_task_free(tsk);
 110                 return NULL;
 111         }
 112
 113         return tsk;
 114 }
 115 EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init);
 116
 117 int
 118 bcom_gen_bd_rx_reset(struct bcom_task *tsk)
 119 {
 120         struct bcom_gen_bd_priv *priv = tsk->priv;
 121         struct bcom_gen_bd_rx_var *var;
 122         struct bcom_gen_bd_rx_inc *inc;
 123
 124         /* Shutdown the task */
 125         bcom_disable_task(tsk->tasknum);
 126
 127         /* Reset the microcode */
 128         var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum);
 129         inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum);
 130
 131         if (bcom_load_image(tsk->tasknum, bcom_gen_bd_rx_task))
 132                 return -1;
 133
 134         var->enable     = bcom_eng->regs_base +
 135                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 136         var->fifo       = (u32) priv->fifo;
 137         var->bd_base    = tsk->bd_pa;
 138         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 139         var->bd_start   = tsk->bd_pa;
 140         var->buffer_size = priv->maxbufsize;
 141
 142         inc->incr_bytes = -(s16)sizeof(u32);
 143         inc->incr_dst   = sizeof(u32);
 144
 145         /* Reset the BDs */
 146         tsk->index = 0;
 147         tsk->outdex = 0;
 148
 149         memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 150
 151         /* Configure some stuff */
 152         bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA);
 153         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 154
 155         out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
 156         bcom_set_initiator(tsk->tasknum, priv->initiator);
 157
 158         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 159
 160         return 0;
 161 }
 162 EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset);
 163
 164 void
 165 bcom_gen_bd_rx_release(struct bcom_task *tsk)
 166 {
 167         /* Nothing special for the GenBD tasks */
 168         bcom_task_free(tsk);
 169 }
 170 EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release);
 171
 172
 173 extern struct bcom_task *
 174 bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo,
 175                         int initiator, int ipr)
 176 {
 177         struct bcom_task *tsk;
 178         struct bcom_gen_bd_priv *priv;
 179
 180         tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
 181                         sizeof(struct bcom_gen_bd_priv));
 182         if (!tsk)
 183                 return NULL;
 184
 185         tsk->flags = BCOM_FLAGS_NONE;
 186
 187         priv = tsk->priv;
 188         priv->fifo      = fifo;
 189         priv->initiator = initiator;
 190         priv->ipr       = ipr;
 191
 192         if (bcom_gen_bd_tx_reset(tsk)) {
 193                 bcom_task_free(tsk);
 194                 return NULL;
 195         }
 196
 197         return tsk;
 198 }
 199 EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init);
 200
 201 int
 202 bcom_gen_bd_tx_reset(struct bcom_task *tsk)
 203 {
 204         struct bcom_gen_bd_priv *priv = tsk->priv;
 205         struct bcom_gen_bd_tx_var *var;
 206         struct bcom_gen_bd_tx_inc *inc;
 207
 208         /* Shutdown the task */
 209         bcom_disable_task(tsk->tasknum);
 210
 211         /* Reset the microcode */
 212         var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum);
 213         inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum);
 214
 215         if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_task))
 216                 return -1;
 217
 218         var->enable     = bcom_eng->regs_base +
 219                                 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 220         var->fifo       = (u32) priv->fifo;
 221         var->bd_base    = tsk->bd_pa;
 222         var->bd_last    = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 223         var->bd_start   = tsk->bd_pa;
 224
 225         inc->incr_bytes = -(s16)sizeof(u32);
 226         inc->incr_src   = sizeof(u32);
 227         inc->incr_src_ma = sizeof(u8);
 228
 229         /* Reset the BDs */
 230         tsk->index = 0;
 231         tsk->outdex = 0;
 232
 233         memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
 234
 235         /* Configure some stuff */
 236         bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA);
 237         bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 238
 239         out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
 240         bcom_set_initiator(tsk->tasknum, priv->initiator);
 241
 242         out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);    /* Clear ints */
 243
 244         return 0;
 245 }
 246 EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset);
 247
 248 void
 249 bcom_gen_bd_tx_release(struct bcom_task *tsk)
 250 {
 251         /* Nothing special for the GenBD tasks */
 252         bcom_task_free(tsk);
 253 }
 254 EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release);
 255
 256 /* ---------------------------------------------------------------------
 257  * PSC support code
 258  */
 259
 260 /**
 261  * bcom_psc_parameters - Bestcomm initialization value table for PSC devices
 262  *
 263  * This structure is only used internally.  It is a lookup table for PSC
 264  * specific parameters to bestcomm tasks.
 265  */
 266 static struct bcom_psc_params {
 267         int rx_initiator;
 268         int rx_ipr;
 269         int tx_initiator;
 270         int tx_ipr;
 271 } bcom_psc_params[] = {
 272         [0] = {
 273                 .rx_initiator = BCOM_INITIATOR_PSC1_RX,
 274                 .rx_ipr = BCOM_IPR_PSC1_RX,
 275                 .tx_initiator = BCOM_INITIATOR_PSC1_TX,
 276                 .tx_ipr = BCOM_IPR_PSC1_TX,
 277         },
 278         [1] = {
 279                 .rx_initiator = BCOM_INITIATOR_PSC2_RX,
 280                 .rx_ipr = BCOM_IPR_PSC2_RX,
 281                 .tx_initiator = BCOM_INITIATOR_PSC2_TX,
 282                 .tx_ipr = BCOM_IPR_PSC2_TX,
 283         },
 284         [2] = {
 285                 .rx_initiator = BCOM_INITIATOR_PSC3_RX,
 286                 .rx_ipr = BCOM_IPR_PSC3_RX,
 287                 .tx_initiator = BCOM_INITIATOR_PSC3_TX,
 288                 .tx_ipr = BCOM_IPR_PSC3_TX,
 289         },
 290         [3] = {
 291                 .rx_initiator = BCOM_INITIATOR_PSC4_RX,
 292                 .rx_ipr = BCOM_IPR_PSC4_RX,
 293                 .tx_initiator = BCOM_INITIATOR_PSC4_TX,
 294                 .tx_ipr = BCOM_IPR_PSC4_TX,
 295         },
 296         [4] = {
 297                 .rx_initiator = BCOM_INITIATOR_PSC5_RX,
 298                 .rx_ipr = BCOM_IPR_PSC5_RX,
 299                 .tx_initiator = BCOM_INITIATOR_PSC5_TX,
 300                 .tx_ipr = BCOM_IPR_PSC5_TX,
 301         },
 302         [5] = {
 303                 .rx_initiator = BCOM_INITIATOR_PSC6_RX,
 304                 .rx_ipr = BCOM_IPR_PSC6_RX,
 305                 .tx_initiator = BCOM_INITIATOR_PSC6_TX,
 306                 .tx_ipr = BCOM_IPR_PSC6_TX,
 307         },
 308 };
 309
 310 /**
 311  * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port
 312  * @psc_num:    Number of the PSC to allocate a task for
 313  * @queue_len:  number of buffer descriptors to allocate for the task
 314  * @fifo:       physical address of FIFO register
 315  * @maxbufsize: Maximum receive data size in bytes.
 316  *
 317  * Allocate a bestcomm task structure for receiving data from a PSC.
 318  */
 319 struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len,
 320                                            phys_addr_t fifo, int maxbufsize)
 321 {
 322         if (psc_num >= MPC52xx_PSC_MAXNUM)
 323                 return NULL;
 324
 325         return bcom_gen_bd_rx_init(queue_len, fifo,
 326                                    bcom_psc_params[psc_num].rx_initiator,
 327                                    bcom_psc_params[psc_num].rx_ipr,
 328                                    maxbufsize);
 329 }
 330 EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init);
 331
 332 /**
 333  * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port
 334  * @psc_num:    Number of the PSC to allocate a task for
 335  * @queue_len:  number of buffer descriptors to allocate for the task
 336  * @fifo:       physical address of FIFO register
 337  *
 338  * Allocate a bestcomm task structure for transmitting data to a PSC.
 339  */
 340 struct bcom_task *
 341 bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo)
 342 {
 343         struct psc;
 344         return bcom_gen_bd_tx_init(queue_len, fifo,
 345                                    bcom_psc_params[psc_num].tx_initiator,
 346                                    bcom_psc_params[psc_num].tx_ipr);
 347 }
 348 EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init);
 349
 350
 351 MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver");
 352 MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>");
 353 MODULE_LICENSE("GPL v2");
 354