summaryrefslogtreecommitdiffstats
path: root/drivers/dma/bestcomm/fec.c
blob: 7f1fb1c999e4306567d4e310dfe4a37534d8dd57 (plain)
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/*
 * Bestcomm FEC tasks driver
 *
 *
 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
 *
 * 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/fec.h>


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

/* fec tasks images */
extern u32 bcom_fec_rx_task[];
extern u32 bcom_fec_tx_task[];

/* rx task vars that need to be set before enabling the task */
struct bcom_fec_rx_var {
	u32 enable;		/* (u16*) address of task's control register */
	u32 fifo;		/* (u32*) address of fec's fifo */
	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 */
};

/* rx task incs that need to be set before enabling the task */
struct bcom_fec_rx_inc {
	u16 pad0;
	s16 incr_bytes;
	u16 pad1;
	s16 incr_dst;
	u16 pad2;
	s16 incr_dst_ma;
};

/* tx task vars that need to be set before enabling the task */
struct bcom_fec_tx_var {
	u32 DRD;		/* (u32*) address of self-modified DRD */
	u32 fifo;		/* (u32*) address of fec's fifo */
	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;	/* set by uCode for each packet */
};

/* tx task incs that need to be set before enabling the task */
struct bcom_fec_tx_inc {
	u16 pad0;
	s16 incr_bytes;
	u16 pad1;
	s16 incr_src;
	u16 pad2;
	s16 incr_src_ma;
};

/* private structure in the task */
struct bcom_fec_priv {
	phys_addr_t	fifo;
	int		maxbufsize;
};


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

struct bcom_task *
bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
{
	struct bcom_task *tsk;
	struct bcom_fec_priv *priv;

	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
				sizeof(struct bcom_fec_priv));
	if (!tsk)
		return NULL;

	tsk->flags = BCOM_FLAGS_NONE;

	priv = tsk->priv;
	priv->fifo = fifo;
	priv->maxbufsize = maxbufsize;

	if (bcom_fec_rx_reset(tsk)) {
		bcom_task_free(tsk);
		return NULL;
	}

	return tsk;
}
EXPORT_SYMBOL_GPL(bcom_fec_rx_init);

int
bcom_fec_rx_reset(struct bcom_task *tsk)
{
	struct bcom_fec_priv *priv = tsk->priv;
	struct bcom_fec_rx_var *var;
	struct bcom_fec_rx_inc *inc;

	/* Shutdown the task */
	bcom_disable_task(tsk->tasknum);

	/* Reset the microcode */
	var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
	inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);

	if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
		return -1;

	var->enable	= bcom_eng->regs_base +
				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
	var->fifo	= (u32) priv->fifo;
	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 = priv->maxbufsize;

	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
	inc->incr_dst	= sizeof(u32);		/* task image, but we stick */
	inc->incr_dst_ma= sizeof(u8);		/* to the official ones     */

	/* Reset the BDs */
	tsk->index = 0;
	tsk->outdex = 0;

	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);

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

	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);

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

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);

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



	/* Return 2nd to last DRD */
	/* This is an ugly hack, but at least it's only done
	   once at initialization */
static u32 *self_modified_drd(int tasknum)
{
	u32 *desc;
	int num_descs;
	int drd_count;
	int i;

	num_descs = bcom_task_num_descs(tasknum);
	desc = bcom_task_desc(tasknum) + num_descs - 1;
	drd_count = 0;
	for (i=0; i<num_descs; i++, desc--)
		if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
			break;
	return desc;
}

struct bcom_task *
bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
{
	struct bcom_task *tsk;
	struct bcom_fec_priv *priv;

	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
				sizeof(struct bcom_fec_priv));
	if (!tsk)
		return NULL;

	tsk->flags = BCOM_FLAGS_ENABLE_TASK;

	priv = tsk->priv;
	priv->fifo = fifo;

	if (bcom_fec_tx_reset(tsk)) {
		bcom_task_free(tsk);
		return NULL;
	}

	return tsk;
}
EXPORT_SYMBOL_GPL(bcom_fec_tx_init);

int
bcom_fec_tx_reset(struct bcom_task *tsk)
{
	struct bcom_fec_priv *priv = tsk->priv;
	struct bcom_fec_tx_var *var;
	struct bcom_fec_tx_inc *inc;

	/* Shutdown the task */
	bcom_disable_task(tsk->tasknum);

	/* Reset the microcode */
	var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
	inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);

	if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
		return -1;

	var->enable	= bcom_eng->regs_base +
				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
	var->fifo	= (u32) priv->fifo;
	var->DRD	= bcom_sram_va2pa(self_modified_drd(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;

	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
	inc->incr_src	= sizeof(u32);		/* task image, but we stick */
	inc->incr_src_ma= sizeof(u8);		/* to the official ones     */

	/* Reset the BDs */
	tsk->index = 0;
	tsk->outdex = 0;

	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);

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

	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);

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

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);

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


MODULE_DESCRIPTION("BestComm FEC tasks driver");
MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
MODULE_LICENSE("GPL v2");

OpenPOWER on IntegriCloud