ata.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Bestcomm ATA task driver
  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
 12#include <linux/kernel.h>
 13#include <linux/module.h>
 14#include <linux/types.h>
 15#include <asm/io.h>
 16
 17#include <linux/fsl/bestcomm/bestcomm.h>
 18#include <linux/fsl/bestcomm/bestcomm_priv.h>
 19#include <linux/fsl/bestcomm/ata.h>
 20
 21
 22/* ======================================================================== */
 23/* Task image/var/inc                                                       */
 24/* ======================================================================== */
 25
 26/* ata task image */
 27extern u32 bcom_ata_task[];
 28
 29/* ata task vars that need to be set before enabling the task */
 30struct bcom_ata_var {
 31	u32 enable;		/* (u16*) address of task's control register */
 32	u32 bd_base;		/* (struct bcom_bd*) beginning of ring buffer */
 33	u32 bd_last;		/* (struct bcom_bd*) end of ring buffer */
 34	u32 bd_start;		/* (struct bcom_bd*) current bd */
 35	u32 buffer_size;	/* size of receive buffer */
 36};
 37
 38/* ata task incs that need to be set before enabling the task */
 39struct bcom_ata_inc {
 40	u16 pad0;
 41	s16 incr_bytes;
 42	u16 pad1;
 43	s16 incr_dst;
 44	u16 pad2;
 45	s16 incr_src;
 46};
 47
 48
 49/* ======================================================================== */
 50/* Task support code                                                        */
 51/* ======================================================================== */
 52
 53struct bcom_task *
 54bcom_ata_init(int queue_len, int maxbufsize)
 55{
 56	struct bcom_task *tsk;
 57	struct bcom_ata_var *var;
 58	struct bcom_ata_inc *inc;
 59
 60	/* Prefetch breaks ATA DMA.  Turn it off for ATA DMA */
 61	bcom_disable_prefetch();
 62
 63	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
 64	if (!tsk)
 65		return NULL;
 66
 67	tsk->flags = BCOM_FLAGS_NONE;
 68
 69	bcom_ata_reset_bd(tsk);
 70
 71	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
 72	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
 73
 74	if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
 75		bcom_task_free(tsk);
 76		return NULL;
 77	}
 78
 79	var->enable	= bcom_eng->regs_base +
 80				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
 81	var->bd_base	= tsk->bd_pa;
 82	var->bd_last	= tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
 83	var->bd_start	= tsk->bd_pa;
 84	var->buffer_size = maxbufsize;
 85
 86	/* Configure some stuff */
 87	bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
 88	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
 89
 90	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
 91	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
 92
 93	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
 94
 95	return tsk;
 96}
 97EXPORT_SYMBOL_GPL(bcom_ata_init);
 98
 99void bcom_ata_rx_prepare(struct bcom_task *tsk)
100{
101	struct bcom_ata_inc *inc;
102
103	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
104
105	inc->incr_bytes	= -(s16)sizeof(u32);
106	inc->incr_src	= 0;
107	inc->incr_dst	= sizeof(u32);
108
109	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
110}
111EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
112
113void bcom_ata_tx_prepare(struct bcom_task *tsk)
114{
115	struct bcom_ata_inc *inc;
116
117	inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
118
119	inc->incr_bytes	= -(s16)sizeof(u32);
120	inc->incr_src	= sizeof(u32);
121	inc->incr_dst	= 0;
122
123	bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
124}
125EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
126
127void bcom_ata_reset_bd(struct bcom_task *tsk)
128{
129	struct bcom_ata_var *var;
130
131	/* Reset all BD */
132	memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
133
134	tsk->index = 0;
135	tsk->outdex = 0;
136
137	var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
138	var->bd_start = var->bd_base;
139}
140EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
141
142void bcom_ata_release(struct bcom_task *tsk)
143{
144	/* Nothing special for the ATA tasks */
145	bcom_task_free(tsk);
146}
147EXPORT_SYMBOL_GPL(bcom_ata_release);
148
149
150MODULE_DESCRIPTION("BestComm ATA task driver");
151MODULE_AUTHOR("John Rigby");
152MODULE_LICENSE("GPL v2");