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gen_bd.c

/*
 * Driver for MPC52xx processor BestComm General Buffer Descriptor
 *
 * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2006 AppSpec Computer Technologies Corp.
 *                    Jeff Gibbons <jeff.gibbons@appspec.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/errno.h>
#include <asm/io.h>

#include <asm/mpc52xx.h>

#include "bestcomm.h"
#include "bestcomm_priv.h"
#include "gen_bd.h"


/* ======================================================================== */
/* Task image/var/inc                                                       */
/* ======================================================================== */

/* gen_bd tasks images */
extern u32 bcom_gen_bd_rx_task[];
extern u32 bcom_gen_bd_tx_task[];

/* rx task vars that need to be set before enabling the task */
struct bcom_gen_bd_rx_var {
      u32 enable;       /* (u16*) address of task's control register */
      u32 fifo;         /* (u32*) address of gen_bd's fifo */
      u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
      u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
      u32 bd_start;           /* (struct bcom_bd*) current bd */
      u32 buffer_size;  /* size of receive buffer */
};

/* rx task incs that need to be set before enabling the task */
struct bcom_gen_bd_rx_inc {
      u16 pad0;
      s16 incr_bytes;
      u16 pad1;
      s16 incr_dst;
};

/* tx task vars that need to be set before enabling the task */
struct bcom_gen_bd_tx_var {
      u32 fifo;         /* (u32*) address of gen_bd's fifo */
      u32 enable;       /* (u16*) address of task's control register */
      u32 bd_base;            /* (struct bcom_bd*) beginning of ring buffer */
      u32 bd_last;            /* (struct bcom_bd*) end of ring buffer */
      u32 bd_start;           /* (struct bcom_bd*) current bd */
      u32 buffer_size;  /* set by uCode for each packet */
};

/* tx task incs that need to be set before enabling the task */
struct bcom_gen_bd_tx_inc {
      u16 pad0;
      s16 incr_bytes;
      u16 pad1;
      s16 incr_src;
      u16 pad2;
      s16 incr_src_ma;
};

/* private structure */
struct bcom_gen_bd_priv {
      phys_addr_t fifo;
      int         initiator;
      int         ipr;
      int         maxbufsize;
};


/* ======================================================================== */
/* Task support code                                                        */
/* ======================================================================== */

struct bcom_task *
bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo,
                  int initiator, int ipr, int maxbufsize)
{
      struct bcom_task *tsk;
      struct bcom_gen_bd_priv *priv;

      tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
                  sizeof(struct bcom_gen_bd_priv));
      if (!tsk)
            return NULL;

      tsk->flags = BCOM_FLAGS_NONE;

      priv = tsk->priv;
      priv->fifo  = fifo;
      priv->initiator   = initiator;
      priv->ipr   = ipr;
      priv->maxbufsize = maxbufsize;

      if (bcom_gen_bd_rx_reset(tsk)) {
            bcom_task_free(tsk);
            return NULL;
      }

      return tsk;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init);

int
bcom_gen_bd_rx_reset(struct bcom_task *tsk)
{
      struct bcom_gen_bd_priv *priv = tsk->priv;
      struct bcom_gen_bd_rx_var *var;
      struct bcom_gen_bd_rx_inc *inc;

      /* Shutdown the task */
      bcom_disable_task(tsk->tasknum);

      /* Reset the microcode */
      var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum);
      inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum);

      if (bcom_load_image(tsk->tasknum, bcom_gen_bd_rx_task))
            return -1;

      var->enable = bcom_eng->regs_base +
                        offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
      var->fifo   = (u32) priv->fifo;
      var->bd_base      = tsk->bd_pa;
      var->bd_last      = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
      var->bd_start     = tsk->bd_pa;
      var->buffer_size = priv->maxbufsize;

      inc->incr_bytes   = -(s16)sizeof(u32);
      inc->incr_dst     = sizeof(u32);

      /* Reset the BDs */
      tsk->index = 0;
      tsk->outdex = 0;

      memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);

      /* Configure some stuff */
      bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA);
      bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

      out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
      bcom_set_initiator(tsk->tasknum, priv->initiator);

      out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);  /* Clear ints */

      return 0;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset);

void
bcom_gen_bd_rx_release(struct bcom_task *tsk)
{
      /* Nothing special for the GenBD tasks */
      bcom_task_free(tsk);
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release);


extern struct bcom_task *
bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo,
                  int initiator, int ipr)
{
      struct bcom_task *tsk;
      struct bcom_gen_bd_priv *priv;

      tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
                  sizeof(struct bcom_gen_bd_priv));
      if (!tsk)
            return NULL;

      tsk->flags = BCOM_FLAGS_NONE;

      priv = tsk->priv;
      priv->fifo  = fifo;
      priv->initiator   = initiator;
      priv->ipr   = ipr;

      if (bcom_gen_bd_tx_reset(tsk)) {
            bcom_task_free(tsk);
            return NULL;
      }

      return tsk;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init);

int
bcom_gen_bd_tx_reset(struct bcom_task *tsk)
{
      struct bcom_gen_bd_priv *priv = tsk->priv;
      struct bcom_gen_bd_tx_var *var;
      struct bcom_gen_bd_tx_inc *inc;

      /* Shutdown the task */
      bcom_disable_task(tsk->tasknum);

      /* Reset the microcode */
      var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum);
      inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum);

      if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_task))
            return -1;

      var->enable = bcom_eng->regs_base +
                        offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
      var->fifo   = (u32) priv->fifo;
      var->bd_base      = tsk->bd_pa;
      var->bd_last      = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
      var->bd_start     = tsk->bd_pa;

      inc->incr_bytes   = -(s16)sizeof(u32);
      inc->incr_src     = sizeof(u32);
      inc->incr_src_ma = sizeof(u8);

      /* Reset the BDs */
      tsk->index = 0;
      tsk->outdex = 0;

      memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);

      /* Configure some stuff */
      bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA);
      bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

      out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
      bcom_set_initiator(tsk->tasknum, priv->initiator);

      out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);  /* Clear ints */

      return 0;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset);

void
bcom_gen_bd_tx_release(struct bcom_task *tsk)
{
      /* Nothing special for the GenBD tasks */
      bcom_task_free(tsk);
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release);


MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver");
MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>");
MODULE_LICENSE("GPL v2");


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