[deliverable/linux.git] / drivers / dma / bestcomm / ata.c

/*
 * Bestcomm ATA task driver
 *
 *
 * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
 *                                   2003-2004 (c) MontaVista, Software, Inc.
 *
 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2006      Freescale - John Rigby
 *
 * 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 <linux/fsl/bestcomm/bestcomm.h>
#include <linux/fsl/bestcomm/bestcomm_priv.h>
#include <linux/fsl/bestcomm/ata.h>


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

/* ata task image */
extern u32 bcom_ata_task[];

/* ata task vars that need to be set before enabling the task */
struct bcom_ata_var {
	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;	/* size of receive buffer */
};

/* ata task incs that need to be set before enabling the task */
struct bcom_ata_inc {
	u16 pad0;
	s16 incr_bytes;
	u16 pad1;
	s16 incr_dst;
	u16 pad2;
	s16 incr_src;
};


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

struct bcom_task *
bcom_ata_init(int queue_len, int maxbufsize)
{
	struct bcom_task *tsk;
	struct bcom_ata_var *var;
	struct bcom_ata_inc *inc;

	/* Prefetch breaks ATA DMA.  Turn it off for ATA DMA */
	bcom_disable_prefetch();

	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
	if (!tsk)
		return NULL;

	tsk->flags = BCOM_FLAGS_NONE;

	bcom_ata_reset_bd(tsk);

	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);

	if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
		bcom_task_free(tsk);
		return NULL;
	}

	var->enable	= bcom_eng->regs_base +
				offsetof(struct mpc52xx_sdma, tcr[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;
	var->buffer_size = maxbufsize;

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

	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);

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

	return tsk;
}
EXPORT_SYMBOL_GPL(bcom_ata_init);

void bcom_ata_rx_prepare(struct bcom_task *tsk)
{
	struct bcom_ata_inc *inc;

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

	inc->incr_bytes	= -(s16)sizeof(u32);
	inc->incr_src	= 0;
	inc->incr_dst	= sizeof(u32);

	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
}
EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);

void bcom_ata_tx_prepare(struct bcom_task *tsk)
{
	struct bcom_ata_inc *inc;

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

	inc->incr_bytes	= -(s16)sizeof(u32);
	inc->incr_src	= sizeof(u32);
	inc->incr_dst	= 0;

	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
}
EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);

void bcom_ata_reset_bd(struct bcom_task *tsk)
{
	struct bcom_ata_var *var;

	/* Reset all BD */
	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);

	tsk->index = 0;
	tsk->outdex = 0;

	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
	var->bd_start = var->bd_base;
}
EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);

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


MODULE_DESCRIPTION("BestComm ATA task driver");
MODULE_AUTHOR("John Rigby");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
9ea68df5 SM	1	/*
	2	* Bestcomm ATA task driver
	3	*
	4	*
	5	* Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com>
	6	* 2003-2004 (c) MontaVista, Software, Inc.
	7	*
	8	* Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
	9	* Copyright (C) 2006 Freescale - John Rigby
	10	*
	11	* This file is licensed under the terms of the GNU General Public License
	12	* version 2. This program is licensed "as is" without any warranty of any
	13	* kind, whether express or implied.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/types.h>
	19	#include <asm/io.h>
	20
9a322993 PDM	21	#include <linux/fsl/bestcomm/bestcomm.h>
	22	#include <linux/fsl/bestcomm/bestcomm_priv.h>
	23	#include <linux/fsl/bestcomm/ata.h>
9ea68df5 SM	24
	25
	26	/* ======================================================================== */
	27	/* Task image/var/inc */
	28	/* ======================================================================== */
	29
	30	/* ata task image */
	31	extern u32 bcom_ata_task[];
	32
	33	/* ata task vars that need to be set before enabling the task */
	34	struct bcom_ata_var {
	35	u32 enable; /* (u16) address of task's control register /
	36	u32 bd_base; /* (struct bcom_bd) beginning of ring buffer /
	37	u32 bd_last; /* (struct bcom_bd) end of ring buffer /
	38	u32 bd_start; /* (struct bcom_bd) current bd /
	39	u32 buffer_size; /* size of receive buffer */
	40	};
	41
	42	/* ata task incs that need to be set before enabling the task */
	43	struct bcom_ata_inc {
	44	u16 pad0;
	45	s16 incr_bytes;
	46	u16 pad1;
	47	s16 incr_dst;
	48	u16 pad2;
	49	s16 incr_src;
	50	};
	51
	52
	53	/* ======================================================================== */
	54	/* Task support code */
	55	/* ======================================================================== */
	56
	57	struct bcom_task *
	58	bcom_ata_init(int queue_len, int maxbufsize)
	59	{
	60	struct bcom_task *tsk;
	61	struct bcom_ata_var *var;
	62	struct bcom_ata_inc *inc;
	63
aaab5e83 GL	64	/* Prefetch breaks ATA DMA. Turn it off for ATA DMA */
	65	bcom_disable_prefetch();
	66
9ea68df5 SM	67	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
	68	if (!tsk)
	69	return NULL;
	70
	71	tsk->flags = BCOM_FLAGS_NONE;
	72
	73	bcom_ata_reset_bd(tsk);
	74
	75	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
	76	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
	77
	78	if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
	79	bcom_task_free(tsk);
	80	return NULL;
	81	}
	82
	83	var->enable = bcom_eng->regs_base +
	84	offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
	85	var->bd_base = tsk->bd_pa;
	86	var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
	87	var->bd_start = tsk->bd_pa;
	88	var->buffer_size = maxbufsize;
	89
	90	/* Configure some stuff */
	91	bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
	92	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
	93
	94	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
	95	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
	96
	97	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
	98
	99	return tsk;
	100	}
	101	EXPORT_SYMBOL_GPL(bcom_ata_init);
	102
	103	void bcom_ata_rx_prepare(struct bcom_task *tsk)
	104	{
	105	struct bcom_ata_inc *inc;
	106
	107	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
	108
	109	inc->incr_bytes = -(s16)sizeof(u32);
	110	inc->incr_src = 0;
	111	inc->incr_dst = sizeof(u32);
	112
	113	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
	114	}
	115	EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
	116
	117	void bcom_ata_tx_prepare(struct bcom_task *tsk)
	118	{
	119	struct bcom_ata_inc *inc;
	120
	121	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
	122
	123	inc->incr_bytes = -(s16)sizeof(u32);
	124	inc->incr_src = sizeof(u32);
	125	inc->incr_dst = 0;
	126
	127	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
	128	}
	129	EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
	130
131	void bcom_ata_reset_bd(struct bcom_task *tsk)
132	{
133	struct bcom_ata_var *var;
134
135	/* Reset all BD */
136	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
137
138	tsk->index = 0;
139	tsk->outdex = 0;
140
141	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
142	var->bd_start = var->bd_base;
143	}
144	EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
145
146	void bcom_ata_release(struct bcom_task *tsk)
147	{
148	/* Nothing special for the ATA tasks */
149	bcom_task_free(tsk);
150	}
151	EXPORT_SYMBOL_GPL(bcom_ata_release);
152
153
154	MODULE_DESCRIPTION("BestComm ATA task driver");
155	MODULE_AUTHOR("John Rigby");
156	MODULE_LICENSE("GPL v2");
157