aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/qe_lib/ucc_slow.c
blob: b930d686a4d18d1b06c5fe0915674f67492df900 (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
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
/*
 * Copyright (C) 2006 Freescale Semicondutor, Inc. All rights reserved.
 *
 * Authors: 	Shlomi Gridish <gridish@freescale.com>
 * 		Li Yang <leoli@freescale.com>
 *
 * Description:
 * QE UCC Slow API Set - UCC Slow specific routines implementations.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/immap_qe.h>
#include <asm/qe.h>

#include <asm/ucc.h>
#include <asm/ucc_slow.h>

u32 ucc_slow_get_qe_cr_subblock(int uccs_num)
{
	switch (uccs_num) {
	case 0: return QE_CR_SUBBLOCK_UCCSLOW1;
	case 1: return QE_CR_SUBBLOCK_UCCSLOW2;
	case 2: return QE_CR_SUBBLOCK_UCCSLOW3;
	case 3: return QE_CR_SUBBLOCK_UCCSLOW4;
	case 4: return QE_CR_SUBBLOCK_UCCSLOW5;
	case 5: return QE_CR_SUBBLOCK_UCCSLOW6;
	case 6: return QE_CR_SUBBLOCK_UCCSLOW7;
	case 7: return QE_CR_SUBBLOCK_UCCSLOW8;
	default: return QE_CR_SUBBLOCK_INVALID;
	}
}

void ucc_slow_poll_transmitter_now(struct ucc_slow_private * uccs)
{
	out_be16(&uccs->us_regs->utodr, UCC_SLOW_TOD);
}

void ucc_slow_graceful_stop_tx(struct ucc_slow_private * uccs)
{
	struct ucc_slow_info *us_info = uccs->us_info;
	u32 id;

	id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
	qe_issue_cmd(QE_GRACEFUL_STOP_TX, id,
			 QE_CR_PROTOCOL_UNSPECIFIED, 0);
}

void ucc_slow_stop_tx(struct ucc_slow_private * uccs)
{
	struct ucc_slow_info *us_info = uccs->us_info;
	u32 id;

	id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
	qe_issue_cmd(QE_STOP_TX, id, QE_CR_PROTOCOL_UNSPECIFIED, 0);
}

void ucc_slow_restart_tx(struct ucc_slow_private * uccs)
{
	struct ucc_slow_info *us_info = uccs->us_info;
	u32 id;

	id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
	qe_issue_cmd(QE_RESTART_TX, id, QE_CR_PROTOCOL_UNSPECIFIED, 0);
}

void ucc_slow_enable(struct ucc_slow_private * uccs, enum comm_dir mode)
{
	struct ucc_slow *us_regs;
	u32 gumr_l;

	us_regs = uccs->us_regs;

	/* Enable reception and/or transmission on this UCC. */
	gumr_l = in_be32(&us_regs->gumr_l);
	if (mode & COMM_DIR_TX) {
		gumr_l |= UCC_SLOW_GUMR_L_ENT;
		uccs->enabled_tx = 1;
	}
	if (mode & COMM_DIR_RX) {
		gumr_l |= UCC_SLOW_GUMR_L_ENR;
		uccs->enabled_rx = 1;
	}
	out_be32(&us_regs->gumr_l, gumr_l);
}

void ucc_slow_disable(struct ucc_slow_private * uccs, enum comm_dir mode)
{
	struct ucc_slow *us_regs;
	u32 gumr_l;

	us_regs = uccs->us_regs;

	/* Disable reception and/or transmission on this UCC. */
	gumr_l = in_be32(&us_regs->gumr_l);
	if (mode & COMM_DIR_TX) {
		gumr_l &= ~UCC_SLOW_GUMR_L_ENT;
		uccs->enabled_tx = 0;
	}
	if (mode & COMM_DIR_RX) {
		gumr_l &= ~UCC_SLOW_GUMR_L_ENR;
		uccs->enabled_rx = 0;
	}
	out_be32(&us_regs->gumr_l, gumr_l);
}

int ucc_slow_init(struct ucc_slow_info * us_info, struct ucc_slow_private ** uccs_ret)
{
	struct ucc_slow_private *uccs;
	u32 i;
	struct ucc_slow *us_regs;
	u32 gumr;
	struct qe_bd *bd;
	u32 id;
	u32 command;
	int ret = 0;

	if (!us_info)
		return -EINVAL;

	/* check if the UCC port number is in range. */
	if ((us_info->ucc_num < 0) || (us_info->ucc_num > UCC_MAX_NUM - 1)) {
		printk(KERN_ERR "%s: illegal UCC number", __FUNCTION__);
		return -EINVAL;
	}

	/*
	 * Set mrblr
	 * Check that 'max_rx_buf_length' is properly aligned (4), unless
	 * rfw is 1, meaning that QE accepts one byte at a time, unlike normal
	 * case when QE accepts 32 bits at a time.
	 */
	if ((!us_info->rfw) &&
		(us_info->max_rx_buf_length & (UCC_SLOW_MRBLR_ALIGNMENT - 1))) {
		printk(KERN_ERR "max_rx_buf_length not aligned.");
		return -EINVAL;
	}

	uccs = kzalloc(sizeof(struct ucc_slow_private), GFP_KERNEL);
	if (!uccs) {
		printk(KERN_ERR "%s: Cannot allocate private data", __FUNCTION__);
		return -ENOMEM;
	}

	/* Fill slow UCC structure */
	uccs->us_info = us_info;
	/* Set the PHY base address */
	uccs->us_regs = ioremap(us_info->regs, sizeof(struct ucc_slow));
	if (uccs->us_regs == NULL) {
		printk(KERN_ERR "%s: Cannot map UCC registers", __FUNCTION__);
		return -ENOMEM;
	}

	uccs->saved_uccm = 0;
	uccs->p_rx_frame = 0;
	us_regs = uccs->us_regs;
	uccs->p_ucce = (u16 *) & (us_regs->ucce);
	uccs->p_uccm = (u16 *) & (us_regs->uccm);
#ifdef STATISTICS
	uccs->rx_frames = 0;
	uccs->tx_frames = 0;
	uccs->rx_discarded = 0;
#endif				/* STATISTICS */

	/* Get PRAM base */
	uccs->us_pram_offset =
		qe_muram_alloc(UCC_SLOW_PRAM_SIZE, ALIGNMENT_OF_UCC_SLOW_PRAM);
	if (IS_MURAM_ERR(uccs->us_pram_offset)) {
		printk(KERN_ERR "%s: cannot allocate MURAM for PRAM", __FUNCTION__);
		ucc_slow_free(uccs);
		return -ENOMEM;
	}
	id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, id, QE_CR_PROTOCOL_UNSPECIFIED,
		     uccs->us_pram_offset);

	uccs->us_pram = qe_muram_addr(uccs->us_pram_offset);

	/* Init Guemr register */
	if ((ret = ucc_init_guemr((struct ucc_common *) us_regs))) {
		printk(KERN_ERR "%s: cannot init GUEMR", __FUNCTION__);
		ucc_slow_free(uccs);
		return ret;
	}

	/* Set UCC to slow type */
	if ((ret = ucc_set_type(us_info->ucc_num,
				(struct ucc_common *) us_regs,
				UCC_SPEED_TYPE_SLOW))) {
		printk(KERN_ERR "%s: cannot set UCC type", __FUNCTION__);
		ucc_slow_free(uccs);
		return ret;
	}

	out_be16(&uccs->us_pram->mrblr, us_info->max_rx_buf_length);

	INIT_LIST_HEAD(&uccs->confQ);

	/* Allocate BDs. */
	uccs->rx_base_offset =
		qe_muram_alloc(us_info->rx_bd_ring_len * sizeof(struct qe_bd),
				QE_ALIGNMENT_OF_BD);
	if (IS_MURAM_ERR(uccs->rx_base_offset)) {
		printk(KERN_ERR "%s: cannot allocate RX BDs", __FUNCTION__);
		uccs->rx_base_offset = 0;
		ucc_slow_free(uccs);
		return -ENOMEM;
	}

	uccs->tx_base_offset =
		qe_muram_alloc(us_info->tx_bd_ring_len * sizeof(struct qe_bd),
			QE_ALIGNMENT_OF_BD);
	if (IS_MURAM_ERR(uccs->tx_base_offset)) {
		printk(KERN_ERR "%s: cannot allocate TX BDs", __FUNCTION__);
		uccs->tx_base_offset = 0;
		ucc_slow_free(uccs);
		return -ENOMEM;
	}

	/* Init Tx bds */
	bd = uccs->confBd = uccs->tx_bd = qe_muram_addr(uccs->tx_base_offset);
	for (i = 0; i < us_info->tx_bd_ring_len - 1; i++) {
		/* clear bd buffer */
		out_be32(&bd->buf, 0);
		/* set bd status and length */
		out_be32((u32 *) bd, 0);
		bd++;
	}
	/* for last BD set Wrap bit */
	out_be32(&bd->buf, 0);
	out_be32((u32 *) bd, cpu_to_be32(T_W));

	/* Init Rx bds */
	bd = uccs->rx_bd = qe_muram_addr(uccs->rx_base_offset);
	for (i = 0; i < us_info->rx_bd_ring_len - 1; i++) {
		/* set bd status and length */
		out_be32((u32*)bd, 0);
		/* clear bd buffer */
		out_be32(&bd->buf, 0);
		bd++;
	}
	/* for last BD set Wrap bit */
	out_be32((u32*)bd, cpu_to_be32(R_W));
	out_be32(&bd->buf, 0);

	/* Set GUMR (For more details see the hardware spec.). */
	/* gumr_h */
	gumr = us_info->tcrc;
	if (us_info->cdp)
		gumr |= UCC_SLOW_GUMR_H_CDP;
	if (us_info->ctsp)
		gumr |= UCC_SLOW_GUMR_H_CTSP;
	if (us_info->cds)
		gumr |= UCC_SLOW_GUMR_H_CDS;
	if (us_info->ctss)
		gumr |= UCC_SLOW_GUMR_H_CTSS;
	if (us_info->tfl)
		gumr |= UCC_SLOW_GUMR_H_TFL;
	if (us_info->rfw)
		gumr |= UCC_SLOW_GUMR_H_RFW;
	if (us_info->txsy)
		gumr |= UCC_SLOW_GUMR_H_TXSY;
	if (us_info->rtsm)
		gumr |= UCC_SLOW_GUMR_H_RTSM;
	out_be32(&us_regs->gumr_h, gumr);

	/* gumr_l */
	gumr = us_info->tdcr | us_info->rdcr | us_info->tenc | us_info->renc |
		us_info->diag | us_info->mode;
	if (us_info->tci)
		gumr |= UCC_SLOW_GUMR_L_TCI;
	if (us_info->rinv)
		gumr |= UCC_SLOW_GUMR_L_RINV;
	if (us_info->tinv)
		gumr |= UCC_SLOW_GUMR_L_TINV;
	if (us_info->tend)
		gumr |= UCC_SLOW_GUMR_L_TEND;
	out_be32(&us_regs->gumr_l, gumr);

	/* Function code registers */

	/* if the data is in cachable memory, the 'global' */
	/* in the function code should be set. */
	uccs->us_pram->tfcr = uccs->us_pram->rfcr =
		us_info->data_mem_part | QE_BMR_BYTE_ORDER_BO_MOT;

	/* rbase, tbase are offsets from MURAM base */
	out_be16(&uccs->us_pram->rbase, uccs->us_pram_offset);
	out_be16(&uccs->us_pram->tbase, uccs->us_pram_offset);

	/* Mux clocking */
	/* Grant Support */
	ucc_set_qe_mux_grant(us_info->ucc_num, us_info->grant_support);
	/* Breakpoint Support */
	ucc_set_qe_mux_bkpt(us_info->ucc_num, us_info->brkpt_support);
	/* Set Tsa or NMSI mode. */
	ucc_set_qe_mux_tsa(us_info->ucc_num, us_info->tsa);
	/* If NMSI (not Tsa), set Tx and Rx clock. */
	if (!us_info->tsa) {
		/* Rx clock routing */
		if (ucc_set_qe_mux_rxtx(us_info->ucc_num, us_info->rx_clock,
					COMM_DIR_RX)) {
			printk(KERN_ERR "%s: illegal value for RX clock",
			       __FUNCTION__);
			ucc_slow_free(uccs);
			return -EINVAL;
		}
		/* Tx clock routing */
		if (ucc_set_qe_mux_rxtx(us_info->ucc_num, us_info->tx_clock,
					COMM_DIR_TX)) {
			printk(KERN_ERR "%s: illegal value for TX clock",
			       __FUNCTION__);
			ucc_slow_free(uccs);
			return -EINVAL;
		}
	}

	/* Set interrupt mask register at UCC level. */
	out_be16(&us_regs->uccm, us_info->uccm_mask);

	/* First, clear anything pending at UCC level,
	 * otherwise, old garbage may come through
	 * as soon as the dam is opened. */

	/* Writing '1' clears */
	out_be16(&us_regs->ucce, 0xffff);

	/* Issue QE Init command */
	if (us_info->init_tx && us_info->init_rx)
		command = QE_INIT_TX_RX;
	else if (us_info->init_tx)
		command = QE_INIT_TX;
	else
		command = QE_INIT_RX;	/* We know at least one is TRUE */
	id = ucc_slow_get_qe_cr_subblock(us_info->ucc_num);
	qe_issue_cmd(command, id, QE_CR_PROTOCOL_UNSPECIFIED, 0);

	*uccs_ret = uccs;
	return 0;
}

void ucc_slow_free(struct ucc_slow_private * uccs)
{
	if (!uccs)
		return;

	if (uccs->rx_base_offset)
		qe_muram_free(uccs->rx_base_offset);

	if (uccs->tx_base_offset)
		qe_muram_free(uccs->tx_base_offset);

	if (uccs->us_pram) {
		qe_muram_free(uccs->us_pram_offset);
		uccs->us_pram = NULL;
	}

	kfree(uccs);
}