1/*
2 * Bestcomm FEC tasks driver
3 *
4 *
5 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
6 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
7 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
8 *
9 * This file is licensed under the terms of the GNU General Public License
10 * version 2. This program is licensed "as is" without any warranty of any
11 * kind, whether express or implied.
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <asm/io.h>
18
19#include <linux/fsl/bestcomm/bestcomm.h>
20#include <linux/fsl/bestcomm/bestcomm_priv.h>
21#include <linux/fsl/bestcomm/fec.h>
22
23
24/* ======================================================================== */
25/* Task image/var/inc                                                       */
26/* ======================================================================== */
27
28/* fec tasks images */
29extern u32 bcom_fec_rx_task[];
30extern u32 bcom_fec_tx_task[];
31
32/* rx task vars that need to be set before enabling the task */
33struct bcom_fec_rx_var {
34	u32 enable;		/* (u16*) address of task's control register */
35	u32 fifo;		/* (u32*) address of fec's fifo */
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/* rx task incs that need to be set before enabling the task */
43struct bcom_fec_rx_inc {
44	u16 pad0;
45	s16 incr_bytes;
46	u16 pad1;
47	s16 incr_dst;
48	u16 pad2;
49	s16 incr_dst_ma;
50};
51
52/* tx task vars that need to be set before enabling the task */
53struct bcom_fec_tx_var {
54	u32 DRD;		/* (u32*) address of self-modified DRD */
55	u32 fifo;		/* (u32*) address of fec's fifo */
56	u32 enable;		/* (u16*) address of task's control register */
57	u32 bd_base;		/* (struct bcom_bd*) beginning of ring buffer */
58	u32 bd_last;		/* (struct bcom_bd*) end of ring buffer */
59	u32 bd_start;		/* (struct bcom_bd*) current bd */
60	u32 buffer_size;	/* set by uCode for each packet */
61};
62
63/* tx task incs that need to be set before enabling the task */
64struct bcom_fec_tx_inc {
65	u16 pad0;
66	s16 incr_bytes;
67	u16 pad1;
68	s16 incr_src;
69	u16 pad2;
70	s16 incr_src_ma;
71};
72
73/* private structure in the task */
74struct bcom_fec_priv {
75	phys_addr_t	fifo;
76	int		maxbufsize;
77};
78
79
80/* ======================================================================== */
81/* Task support code                                                        */
82/* ======================================================================== */
83
84struct bcom_task *
85bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
86{
87	struct bcom_task *tsk;
88	struct bcom_fec_priv *priv;
89
90	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
91				sizeof(struct bcom_fec_priv));
92	if (!tsk)
93		return NULL;
94
95	tsk->flags = BCOM_FLAGS_NONE;
96
97	priv = tsk->priv;
98	priv->fifo = fifo;
99	priv->maxbufsize = maxbufsize;
100
101	if (bcom_fec_rx_reset(tsk)) {
102		bcom_task_free(tsk);
103		return NULL;
104	}
105
106	return tsk;
107}
108EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
109
110int
111bcom_fec_rx_reset(struct bcom_task *tsk)
112{
113	struct bcom_fec_priv *priv = tsk->priv;
114	struct bcom_fec_rx_var *var;
115	struct bcom_fec_rx_inc *inc;
116
117	/* Shutdown the task */
118	bcom_disable_task(tsk->tasknum);
119
120	/* Reset the microcode */
121	var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
122	inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);
123
124	if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
125		return -1;
126
127	var->enable	= bcom_eng->regs_base +
128				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
129	var->fifo	= (u32) priv->fifo;
130	var->bd_base	= tsk->bd_pa;
131	var->bd_last	= tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
132	var->bd_start	= tsk->bd_pa;
133	var->buffer_size = priv->maxbufsize;
134
135	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
136	inc->incr_dst	= sizeof(u32);		/* task image, but we stick */
137	inc->incr_dst_ma= sizeof(u8);		/* to the official ones     */
138
139	/* Reset the BDs */
140	tsk->index = 0;
141	tsk->outdex = 0;
142
143	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
144
145	/* Configure some stuff */
146	bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
147	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
148
149	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
150
151	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);	/* Clear ints */
152
153	return 0;
154}
155EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
156
157void
158bcom_fec_rx_release(struct bcom_task *tsk)
159{
160	/* Nothing special for the FEC tasks */
161	bcom_task_free(tsk);
162}
163EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
164
165
166
167	/* Return 2nd to last DRD */
168	/* This is an ugly hack, but at least it's only done
169	   once at initialization */
170static u32 *self_modified_drd(int tasknum)
171{
172	u32 *desc;
173	int num_descs;
174	int drd_count;
175	int i;
176
177	num_descs = bcom_task_num_descs(tasknum);
178	desc = bcom_task_desc(tasknum) + num_descs - 1;
179	drd_count = 0;
180	for (i=0; i<num_descs; i++, desc--)
181		if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
182			break;
183	return desc;
184}
185
186struct bcom_task *
187bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
188{
189	struct bcom_task *tsk;
190	struct bcom_fec_priv *priv;
191
192	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
193				sizeof(struct bcom_fec_priv));
194	if (!tsk)
195		return NULL;
196
197	tsk->flags = BCOM_FLAGS_ENABLE_TASK;
198
199	priv = tsk->priv;
200	priv->fifo = fifo;
201
202	if (bcom_fec_tx_reset(tsk)) {
203		bcom_task_free(tsk);
204		return NULL;
205	}
206
207	return tsk;
208}
209EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
210
211int
212bcom_fec_tx_reset(struct bcom_task *tsk)
213{
214	struct bcom_fec_priv *priv = tsk->priv;
215	struct bcom_fec_tx_var *var;
216	struct bcom_fec_tx_inc *inc;
217
218	/* Shutdown the task */
219	bcom_disable_task(tsk->tasknum);
220
221	/* Reset the microcode */
222	var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
223	inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);
224
225	if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
226		return -1;
227
228	var->enable	= bcom_eng->regs_base +
229				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
230	var->fifo	= (u32) priv->fifo;
231	var->DRD	= bcom_sram_va2pa(self_modified_drd(tsk->tasknum));
232	var->bd_base	= tsk->bd_pa;
233	var->bd_last	= tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
234	var->bd_start	= tsk->bd_pa;
235
236	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
237	inc->incr_src	= sizeof(u32);		/* task image, but we stick */
238	inc->incr_src_ma= sizeof(u8);		/* to the official ones     */
239
240	/* Reset the BDs */
241	tsk->index = 0;
242	tsk->outdex = 0;
243
244	memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
245
246	/* Configure some stuff */
247	bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
248	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
249
250	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
251
252	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);	/* Clear ints */
253
254	return 0;
255}
256EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
257
258void
259bcom_fec_tx_release(struct bcom_task *tsk)
260{
261	/* Nothing special for the FEC tasks */
262	bcom_task_free(tsk);
263}
264EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
265
266
267MODULE_DESCRIPTION("BestComm FEC tasks driver");
268MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
269MODULE_LICENSE("GPL v2");
270
271