1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* 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 "bestcomm.h"
#include "bestcomm_priv.h"
#include "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");
|
