Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Bestcomm FEC tasks driver

 *

 *

 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>

 * Copyright (C) 2003-2004 MontaVista, Software, Inc.

 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )

 *

 * This file is licensed under the terms of the GNU General Public License

 * version 2. This program is licensed "as is" without any warranty of any

 * kind, whether express or implied.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/types.h>

#include <asm/io.h>

#include "bestcomm.h"

#include "bestcomm_priv.h"

#include "fec.h"

/* ======================================================================== */

/* Task image/var/inc                                                       */

/* ======================================================================== */

/* fec tasks images */

extern u32 bcom_fec_rx_task[];

extern u32 bcom_fec_tx_task[];

/* rx task vars that need to be set before enabling the task */

struct bcom_fec_rx_var {

        u32 enable;             /* (u16*) address of task's control register */

        u32 fifo;               /* (u32*) address of fec'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_fec_rx_inc {

        u16 pad0;

        s16 incr_bytes;

        u16 pad1;

        s16 incr_dst;

        u16 pad2;

        s16 incr_dst_ma;

};

/* tx task vars that need to be set before enabling the task */

struct bcom_fec_tx_var {

        u32 DRD;                /* (u32*) address of self-modified DRD */

        u32 fifo;               /* (u32*) address of fec'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_fec_tx_inc {

        u16 pad0;

        s16 incr_bytes;

        u16 pad1;

        s16 incr_src;

        u16 pad2;

        s16 incr_src_ma;

};

/* private structure in the task */

struct bcom_fec_priv {

        phys_addr_t     fifo;

        int             maxbufsize;

};

/* ======================================================================== */

/* Task support code                                                        */

/* ======================================================================== */

struct bcom_task *

bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)

{

        struct bcom_task *tsk;

        struct bcom_fec_priv *priv;

        tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),

                                sizeof(struct bcom_fec_priv));

        if (!tsk)

                return NULL;

        tsk->flags = BCOM_FLAGS_NONE;

        priv = tsk->priv;

        priv->fifo = fifo;

        priv->maxbufsize = maxbufsize;

        if (bcom_fec_rx_reset(tsk)) {

                bcom_task_free(tsk);

                return NULL;

        }

        return tsk;

}

EXPORT_SYMBOL_GPL(bcom_fec_rx_init);

int

bcom_fec_rx_reset(struct bcom_task *tsk)

{

        struct bcom_fec_priv *priv = tsk->priv;

        struct bcom_fec_rx_var *var;

        struct bcom_fec_rx_inc *inc;

        /* Shutdown the task */

        bcom_disable_task(tsk->tasknum);

        /* Reset the microcode */

        var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);

        inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);

        if (bcom_load_image(tsk->tasknum, bcom_fec_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);    /* These should be in the   */

        inc->incr_dst   = sizeof(u32);          /* task image, but we stick */

        inc->incr_dst_ma= sizeof(u8);           /* to the official ones     */

        /* 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_FEC_RX_BD_PRAGMA);

        bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

        out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);

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

        return 0;

}

EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);

void

bcom_fec_rx_release(struct bcom_task *tsk)

{

        /* Nothing special for the FEC tasks */

        bcom_task_free(tsk);

}

EXPORT_SYMBOL_GPL(bcom_fec_rx_release);

        /* Return 2nd to last DRD */

        /* This is an ugly hack, but at least it's only done

           once at initialization */

static u32 *self_modified_drd(int tasknum)

{

        u32 *desc;

        int num_descs;

        int drd_count;

        int i;

        num_descs = bcom_task_num_descs(tasknum);

        desc = bcom_task_desc(tasknum) + num_descs - 1;

        drd_count = 0;

        for (i=0; i<num_descs; i++, desc--)

                if (bcom_desc_is_drd(*desc) && ++drd_count == 3)

                        break;

        return desc;

}

struct bcom_task *

bcom_fec_tx_init(int queue_len, phys_addr_t fifo)

{

        struct bcom_task *tsk;

        struct bcom_fec_priv *priv;

        tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),

                                sizeof(struct bcom_fec_priv));

        if (!tsk)

                return NULL;

        tsk->flags = BCOM_FLAGS_ENABLE_TASK;

        priv = tsk->priv;

        priv->fifo = fifo;

        if (bcom_fec_tx_reset(tsk)) {

                bcom_task_free(tsk);

                return NULL;

        }

        return tsk;

}

EXPORT_SYMBOL_GPL(bcom_fec_tx_init);

int

bcom_fec_tx_reset(struct bcom_task *tsk)

{

        struct bcom_fec_priv *priv = tsk->priv;

        struct bcom_fec_tx_var *var;

        struct bcom_fec_tx_inc *inc;

        /* Shutdown the task */

        bcom_disable_task(tsk->tasknum);

        /* Reset the microcode */

        var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);

        inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);

        if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))

                return -1;

        var->enable     = bcom_eng->regs_base +

                                offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);

        var->fifo       = (u32) priv->fifo;

        var->DRD        = bcom_sram_va2pa(self_modified_drd(tsk->tasknum));

        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);    /* These should be in the   */

        inc->incr_src   = sizeof(u32);          /* task image, but we stick */

        inc->incr_src_ma= sizeof(u8);           /* to the official ones     */

        /* 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_FEC_TX_BD_PRAGMA);

        bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

        out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);

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

        return 0;

}

EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);

void

bcom_fec_tx_release(struct bcom_task *tsk)

{

        /* Nothing special for the FEC tasks */

        bcom_task_free(tsk);

}

EXPORT_SYMBOL_GPL(bcom_fec_tx_release);

MODULE_DESCRIPTION("BestComm FEC tasks driver");

MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");

MODULE_LICENSE("GPL v2");