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(bd_count: queue_len, bd_size: sizeof(struct bcom_fec_bd),
87 priv_size: 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(task: tsk->tasknum);
115
116 /* Reset the microcode */
117 var = (struct bcom_fec_rx_var *) bcom_task_var(task: tsk->tasknum);
118 inc = (struct bcom_fec_rx_inc *) bcom_task_inc(task: tsk->tasknum);
119
120 if (bcom_load_image(task: tsk->tasknum, task_image: 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(task: tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA);
143 bcom_set_task_auto_start(task: tsk->tasknum, next_task: 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(task: tasknum);
174 desc = bcom_task_desc(task: tasknum) + num_descs - 1;
175 drd_count = 0;
176 for (i=0; i<num_descs; i++, desc--)
177 if (bcom_desc_is_drd(desc: *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(bd_count: queue_len, bd_size: sizeof(struct bcom_fec_bd),
189 priv_size: 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(task: tsk->tasknum);
216
217 /* Reset the microcode */
218 var = (struct bcom_fec_tx_var *) bcom_task_var(task: tsk->tasknum);
219 inc = (struct bcom_fec_tx_inc *) bcom_task_inc(task: tsk->tasknum);
220
221 if (bcom_load_image(task: tsk->tasknum, task_image: 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(va: self_modified_drd(tasknum: 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(task: tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA);
244 bcom_set_task_auto_start(task: tsk->tasknum, next_task: 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

source code of linux/drivers/dma/bestcomm/fec.c