arch/powerpc/sysdev/bestcomm/fec.c - kernel/windcharger - Git at Google

 /*
  * 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");
	/*
	* 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");