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/*
* 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");
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