aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/bestcomm/gen_bd.c
blob: e0a53e3147b2f159022569192dac6590bd6f8ebd (plain) (blame)
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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/*
 * Driver for MPC52xx processor BestComm General Buffer Descriptor
 *
 * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2006 AppSpec Computer Technologies Corp.
 *                    Jeff Gibbons <jeff.gibbons@appspec.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <asm/errno.h>
#include <asm/io.h>

#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>

#include "bestcomm.h"
#include "bestcomm_priv.h"
#include "gen_bd.h"


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

/* gen_bd tasks images */
extern u32 bcom_gen_bd_rx_task[];
extern u32 bcom_gen_bd_tx_task[];

/* rx task vars that need to be set before enabling the task */
struct bcom_gen_bd_rx_var {
	u32 enable;		/* (u16*) address of task's control register */
	u32 fifo;		/* (u32*) address of gen_bd'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_gen_bd_rx_inc {
	u16 pad0;
	s16 incr_bytes;
	u16 pad1;
	s16 incr_dst;
};

/* tx task vars that need to be set before enabling the task */
struct bcom_gen_bd_tx_var {
	u32 fifo;		/* (u32*) address of gen_bd'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_gen_bd_tx_inc {
	u16 pad0;
	s16 incr_bytes;
	u16 pad1;
	s16 incr_src;
	u16 pad2;
	s16 incr_src_ma;
};

/* private structure */
struct bcom_gen_bd_priv {
	phys_addr_t	fifo;
	int		initiator;
	int		ipr;
	int		maxbufsize;
};


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

struct bcom_task *
bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo,
			int initiator, int ipr, int maxbufsize)
{
	struct bcom_task *tsk;
	struct bcom_gen_bd_priv *priv;

	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
			sizeof(struct bcom_gen_bd_priv));
	if (!tsk)
		return NULL;

	tsk->flags = BCOM_FLAGS_NONE;

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

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

	return tsk;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init);

int
bcom_gen_bd_rx_reset(struct bcom_task *tsk)
{
	struct bcom_gen_bd_priv *priv = tsk->priv;
	struct bcom_gen_bd_rx_var *var;
	struct bcom_gen_bd_rx_inc *inc;

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

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

	if (bcom_load_image(tsk->tasknum, bcom_gen_bd_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);
	inc->incr_dst	= sizeof(u32);

	/* 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_GEN_RX_BD_PRAGMA);
	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

	out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
	bcom_set_initiator(tsk->tasknum, priv->initiator);

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

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset);

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


extern struct bcom_task *
bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo,
			int initiator, int ipr)
{
	struct bcom_task *tsk;
	struct bcom_gen_bd_priv *priv;

	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd),
			sizeof(struct bcom_gen_bd_priv));
	if (!tsk)
		return NULL;

	tsk->flags = BCOM_FLAGS_NONE;

	priv = tsk->priv;
	priv->fifo	= fifo;
	priv->initiator	= initiator;
	priv->ipr	= ipr;

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

	return tsk;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init);

int
bcom_gen_bd_tx_reset(struct bcom_task *tsk)
{
	struct bcom_gen_bd_priv *priv = tsk->priv;
	struct bcom_gen_bd_tx_var *var;
	struct bcom_gen_bd_tx_inc *inc;

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

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

	if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_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;

	inc->incr_bytes	= -(s16)sizeof(u32);
	inc->incr_src	= sizeof(u32);
	inc->incr_src_ma = sizeof(u8);

	/* 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_GEN_TX_BD_PRAGMA);
	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);

	out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr);
	bcom_set_initiator(tsk->tasknum, priv->initiator);

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

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset);

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

/* ---------------------------------------------------------------------
 * PSC support code
 */

/**
 * bcom_psc_parameters - Bestcomm initialization value table for PSC devices
 *
 * This structure is only used internally.  It is a lookup table for PSC
 * specific parameters to bestcomm tasks.
 */
static struct bcom_psc_params {
	int rx_initiator;
	int rx_ipr;
	int tx_initiator;
	int tx_ipr;
} bcom_psc_params[] = {
	[0] = {
		.rx_initiator = BCOM_INITIATOR_PSC1_RX,
		.rx_ipr = BCOM_IPR_PSC1_RX,
		.tx_initiator = BCOM_INITIATOR_PSC1_TX,
		.tx_ipr = BCOM_IPR_PSC1_TX,
	},
	[1] = {
		.rx_initiator = BCOM_INITIATOR_PSC2_RX,
		.rx_ipr = BCOM_IPR_PSC2_RX,
		.tx_initiator = BCOM_INITIATOR_PSC2_TX,
		.tx_ipr = BCOM_IPR_PSC2_TX,
	},
	[2] = {
		.rx_initiator = BCOM_INITIATOR_PSC3_RX,
		.rx_ipr = BCOM_IPR_PSC3_RX,
		.tx_initiator = BCOM_INITIATOR_PSC3_TX,
		.tx_ipr = BCOM_IPR_PSC3_TX,
	},
	[3] = {
		.rx_initiator = BCOM_INITIATOR_PSC4_RX,
		.rx_ipr = BCOM_IPR_PSC4_RX,
		.tx_initiator = BCOM_INITIATOR_PSC4_TX,
		.tx_ipr = BCOM_IPR_PSC4_TX,
	},
	[4] = {
		.rx_initiator = BCOM_INITIATOR_PSC5_RX,
		.rx_ipr = BCOM_IPR_PSC5_RX,
		.tx_initiator = BCOM_INITIATOR_PSC5_TX,
		.tx_ipr = BCOM_IPR_PSC5_TX,
	},
	[5] = {
		.rx_initiator = BCOM_INITIATOR_PSC6_RX,
		.rx_ipr = BCOM_IPR_PSC6_RX,
		.tx_initiator = BCOM_INITIATOR_PSC6_TX,
		.tx_ipr = BCOM_IPR_PSC6_TX,
	},
};

/**
 * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port
 * @psc_num:	Number of the PSC to allocate a task for
 * @queue_len:	number of buffer descriptors to allocate for the task
 * @fifo:	physical address of FIFO register
 * @maxbufsize:	Maximum receive data size in bytes.
 *
 * Allocate a bestcomm task structure for receiving data from a PSC.
 */
struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len,
					   phys_addr_t fifo, int maxbufsize)
{
	if (psc_num >= MPC52xx_PSC_MAXNUM)
		return NULL;

	return bcom_gen_bd_rx_init(queue_len, fifo,
				   bcom_psc_params[psc_num].rx_initiator,
				   bcom_psc_params[psc_num].rx_ipr,
				   maxbufsize);
}
EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init);

/**
 * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port
 * @psc_num:	Number of the PSC to allocate a task for
 * @queue_len:	number of buffer descriptors to allocate for the task
 * @fifo:	physical address of FIFO register
 *
 * Allocate a bestcomm task structure for transmitting data to a PSC.
 */
struct bcom_task *
bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo)
{
	struct psc;
	return bcom_gen_bd_tx_init(queue_len, fifo,
				   bcom_psc_params[psc_num].tx_initiator,
				   bcom_psc_params[psc_num].tx_ipr);
}
EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init);


MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver");
MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>");
MODULE_LICENSE("GPL v2");