1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Bestcomm FEC tasks driver
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
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <asm/io.h>
14
15#include <linux/fsl/bestcomm/bestcomm.h>
16#include <linux/fsl/bestcomm/bestcomm_priv.h>
17#include <linux/fsl/bestcomm/fec.h>
18
19
20/* ======================================================================== */
21/* Task image/var/inc                                                       */
22/* ======================================================================== */
23
24/* fec tasks images */
25extern u32 bcom_fec_rx_task[];
26extern u32 bcom_fec_tx_task[];
27
28/* rx task vars that need to be set before enabling the task */
29struct bcom_fec_rx_var {
30	u32 enable;		/* (u16*) address of task's control register */
31	u32 fifo;		/* (u32*) address of fec's fifo */
32	u32 bd_base;		/* (struct bcom_bd*) beginning of ring buffer */
33	u32 bd_last;		/* (struct bcom_bd*) end of ring buffer */
34	u32 bd_start;		/* (struct bcom_bd*) current bd */
35	u32 buffer_size;	/* size of receive buffer */
36};
37
38/* rx task incs that need to be set before enabling the task */
39struct bcom_fec_rx_inc {
40	u16 pad0;
41	s16 incr_bytes;
42	u16 pad1;
43	s16 incr_dst;
44	u16 pad2;
45	s16 incr_dst_ma;
46};
47
48/* tx task vars that need to be set before enabling the task */
49struct bcom_fec_tx_var {
50	u32 DRD;		/* (u32*) address of self-modified DRD */
51	u32 fifo;		/* (u32*) address of fec's fifo */
52	u32 enable;		/* (u16*) address of task's control register */
53	u32 bd_base;		/* (struct bcom_bd*) beginning of ring buffer */
54	u32 bd_last;		/* (struct bcom_bd*) end of ring buffer */
55	u32 bd_start;		/* (struct bcom_bd*) current bd */
56	u32 buffer_size;	/* set by uCode for each packet */
57};
58
59/* tx task incs that need to be set before enabling the task */
60struct bcom_fec_tx_inc {
61	u16 pad0;
62	s16 incr_bytes;
63	u16 pad1;
64	s16 incr_src;
65	u16 pad2;
66	s16 incr_src_ma;
67};
68
69/* private structure in the task */
70struct bcom_fec_priv {
71	phys_addr_t	fifo;
72	int		maxbufsize;
73};
74
75
76/* ======================================================================== */
77/* Task support code                                                        */
78/* ======================================================================== */
79
80struct bcom_task *
81bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize)
82{
83	struct bcom_task *tsk;
84	struct bcom_fec_priv *priv;
85
86	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
87				sizeof(struct bcom_fec_priv));
88	if (!tsk)
89		return NULL;
90
91	tsk->flags = BCOM_FLAGS_NONE;
92
93	priv = tsk->priv;
94	priv->fifo = fifo;
95	priv->maxbufsize = maxbufsize;
96
97	if (bcom_fec_rx_reset(tsk)) {
98		bcom_task_free(tsk);
99		return NULL;
100	}
101
102	return tsk;
103}
104EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
105
106int
107bcom_fec_rx_reset(struct bcom_task *tsk)
108{
109	struct bcom_fec_priv *priv = tsk->priv;
110	struct bcom_fec_rx_var *var;
111	struct bcom_fec_rx_inc *inc;
112
113	/* Shutdown the task */
114	bcom_disable_task(tsk->tasknum);
115
116	/* Reset the microcode */
117	var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum);
118	inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum);
119
120	if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task))
121		return -1;
122
123	var->enable	= bcom_eng->regs_base +
124				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
125	var->fifo	= (u32) priv->fifo;
126	var->bd_base	= tsk->bd_pa;
127	var->bd_last	= tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
128	var->bd_start	= tsk->bd_pa;
129	var->buffer_size = priv->maxbufsize;
130
131	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
132	inc->incr_dst	= sizeof(u32);		/* task image, but we stick */
133	inc->incr_dst_ma= sizeof(u8);		/* to the official ones     */
134
135	/* Reset the BDs */
136	tsk->index = 0;
137	tsk->outdex = 0;
138
139	memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
140
141	/* Configure some stuff */
142	bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
143	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
144
145	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX);
146
147	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);	/* Clear ints */
148
149	return 0;
150}
151EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
152
153void
154bcom_fec_rx_release(struct bcom_task *tsk)
155{
156	/* Nothing special for the FEC tasks */
157	bcom_task_free(tsk);
158}
159EXPORT_SYMBOL_GPL(bcom_fec_rx_release);
160
161
162
163	/* Return 2nd to last DRD */
164	/* This is an ugly hack, but at least it's only done
165	   once at initialization */
166static u32 *self_modified_drd(int tasknum)
167{
168	u32 *desc;
169	int num_descs;
170	int drd_count;
171	int i;
172
173	num_descs = bcom_task_num_descs(tasknum);
174	desc = bcom_task_desc(tasknum) + num_descs - 1;
175	drd_count = 0;
176	for (i=0; i<num_descs; i++, desc--)
177		if (bcom_desc_is_drd(*desc) && ++drd_count == 3)
178			break;
179	return desc;
180}
181
182struct bcom_task *
183bcom_fec_tx_init(int queue_len, phys_addr_t fifo)
184{
185	struct bcom_task *tsk;
186	struct bcom_fec_priv *priv;
187
188	tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd),
189				sizeof(struct bcom_fec_priv));
190	if (!tsk)
191		return NULL;
192
193	tsk->flags = BCOM_FLAGS_ENABLE_TASK;
194
195	priv = tsk->priv;
196	priv->fifo = fifo;
197
198	if (bcom_fec_tx_reset(tsk)) {
199		bcom_task_free(tsk);
200		return NULL;
201	}
202
203	return tsk;
204}
205EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
206
207int
208bcom_fec_tx_reset(struct bcom_task *tsk)
209{
210	struct bcom_fec_priv *priv = tsk->priv;
211	struct bcom_fec_tx_var *var;
212	struct bcom_fec_tx_inc *inc;
213
214	/* Shutdown the task */
215	bcom_disable_task(tsk->tasknum);
216
217	/* Reset the microcode */
218	var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum);
219	inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum);
220
221	if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task))
222		return -1;
223
224	var->enable	= bcom_eng->regs_base +
225				offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]);
226	var->fifo	= (u32) priv->fifo;
227	var->DRD	= bcom_sram_va2pa(self_modified_drd(tsk->tasknum));
228	var->bd_base	= tsk->bd_pa;
229	var->bd_last	= tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size);
230	var->bd_start	= tsk->bd_pa;
231
232	inc->incr_bytes	= -(s16)sizeof(u32);	/* These should be in the   */
233	inc->incr_src	= sizeof(u32);		/* task image, but we stick */
234	inc->incr_src_ma= sizeof(u8);		/* to the official ones     */
235
236	/* Reset the BDs */
237	tsk->index = 0;
238	tsk->outdex = 0;
239
240	memset_io(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size);
241
242	/* Configure some stuff */
243	bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
244	bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum);
245
246	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX);
247
248	out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum);	/* Clear ints */
249
250	return 0;
251}
252EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
253
254void
255bcom_fec_tx_release(struct bcom_task *tsk)
256{
257	/* Nothing special for the FEC tasks */
258	bcom_task_free(tsk);
259}
260EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
261
262
263MODULE_DESCRIPTION("BestComm FEC tasks driver");
264MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
265MODULE_LICENSE("GPL v2");
266