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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21#include "bestcomm.h"
22#include "bestcomm_priv.h"
23#include "ata.h"
24
25
26/* ======================================================================== */
27/* Task image/var/inc */
28/* ======================================================================== */
29
30/* ata task image */
31extern u32 bcom_ata_task[];
32
33/* ata task vars that need to be set before enabling the task */
34struct 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 */
43struct 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
57struct bcom_task *
58bcom_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
64 tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0);
65 if (!tsk)
66 return NULL;
67
68 tsk->flags = BCOM_FLAGS_NONE;
69
70 bcom_ata_reset_bd(tsk);
71
72 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
73 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
74
75 if (bcom_load_image(tsk->tasknum, bcom_ata_task)) {
76 bcom_task_free(tsk);
77 return NULL;
78 }
79
80 var->enable = bcom_eng->regs_base +
81 offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
82 var->bd_base = tsk->bd_pa;
83 var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
84 var->bd_start = tsk->bd_pa;
85 var->buffer_size = maxbufsize;
86
87 /* Configure some stuff */
88 bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA);
89 bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
90
91 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX);
92 out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX);
93
94 out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */
95
96 return tsk;
97}
98EXPORT_SYMBOL_GPL(bcom_ata_init);
99
100void bcom_ata_rx_prepare(struct bcom_task *tsk)
101{
102 struct bcom_ata_inc *inc;
103
104 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
105
106 inc->incr_bytes = -(s16)sizeof(u32);
107 inc->incr_src = 0;
108 inc->incr_dst = sizeof(u32);
109
110 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX);
111}
112EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare);
113
114void bcom_ata_tx_prepare(struct bcom_task *tsk)
115{
116 struct bcom_ata_inc *inc;
117
118 inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum);
119
120 inc->incr_bytes = -(s16)sizeof(u32);
121 inc->incr_src = sizeof(u32);
122 inc->incr_dst = 0;
123
124 bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX);
125}
126EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare);
127
128void bcom_ata_reset_bd(struct bcom_task *tsk)
129{
130 struct bcom_ata_var *var;
131
132 /* Reset all BD */
133 memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
134
135 tsk->index = 0;
136 tsk->outdex = 0;
137
138 var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum);
139 var->bd_start = var->bd_base;
140}
141EXPORT_SYMBOL_GPL(bcom_ata_reset_bd);
142
143void bcom_ata_release(struct bcom_task *tsk)
144{
145 /* Nothing special for the ATA tasks */
146 bcom_task_free(tsk);
147}
148EXPORT_SYMBOL_GPL(bcom_ata_release);
149
150
151MODULE_DESCRIPTION("BestComm ATA task driver");
152MODULE_AUTHOR("John Rigby");
153MODULE_LICENSE("GPL v2");
154