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");
153