xref: /openbmc/linux/drivers/dma/bestcomm/fec.c (revision 3bb16560)
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 */
25 extern u32 bcom_fec_rx_task[];
26 extern u32 bcom_fec_tx_task[];
27 
28 /* rx task vars that need to be set before enabling the task */
29 struct 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 */
39 struct 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 */
49 struct 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 */
60 struct 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 */
70 struct bcom_fec_priv {
71 	phys_addr_t	fifo;
72 	int		maxbufsize;
73 };
74 
75 
76 /* ======================================================================== */
77 /* Task support code                                                        */
78 /* ======================================================================== */
79 
80 struct bcom_task *
bcom_fec_rx_init(int queue_len,phys_addr_t fifo,int maxbufsize)81 bcom_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 }
104 EXPORT_SYMBOL_GPL(bcom_fec_rx_init);
105 
106 int
bcom_fec_rx_reset(struct bcom_task * tsk)107 bcom_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 }
151 EXPORT_SYMBOL_GPL(bcom_fec_rx_reset);
152 
153 void
bcom_fec_rx_release(struct bcom_task * tsk)154 bcom_fec_rx_release(struct bcom_task *tsk)
155 {
156 	/* Nothing special for the FEC tasks */
157 	bcom_task_free(tsk);
158 }
159 EXPORT_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 */
self_modified_drd(int tasknum)166 static 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 
182 struct bcom_task *
bcom_fec_tx_init(int queue_len,phys_addr_t fifo)183 bcom_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 }
205 EXPORT_SYMBOL_GPL(bcom_fec_tx_init);
206 
207 int
bcom_fec_tx_reset(struct bcom_task * tsk)208 bcom_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 }
252 EXPORT_SYMBOL_GPL(bcom_fec_tx_reset);
253 
254 void
bcom_fec_tx_release(struct bcom_task * tsk)255 bcom_fec_tx_release(struct bcom_task *tsk)
256 {
257 	/* Nothing special for the FEC tasks */
258 	bcom_task_free(tsk);
259 }
260 EXPORT_SYMBOL_GPL(bcom_fec_tx_release);
261 
262 
263 MODULE_DESCRIPTION("BestComm FEC tasks driver");
264 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
265 MODULE_LICENSE("GPL v2");
266