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ba11c79a SM |
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 | ||
9a322993 PDM |
19 | #include <linux/fsl/bestcomm/bestcomm.h> |
20 | #include <linux/fsl/bestcomm/bestcomm_priv.h> | |
21 | #include <linux/fsl/bestcomm/fec.h> | |
ba11c79a SM |
22 | |
23 | ||
24 | /* ======================================================================== */ | |
25 | /* Task image/var/inc */ | |
26 | /* ======================================================================== */ | |
27 | ||
28 | /* fec tasks images */ | |
29 | extern u32 bcom_fec_rx_task[]; | |
30 | extern u32 bcom_fec_tx_task[]; | |
31 | ||
32 | /* rx task vars that need to be set before enabling the task */ | |
33 | struct 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 */ | |
43 | struct 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 */ | |
53 | struct 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 */ | |
64 | struct 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 */ | |
74 | struct bcom_fec_priv { | |
75 | phys_addr_t fifo; | |
76 | int maxbufsize; | |
77 | }; | |
78 | ||
79 | ||
80 | /* ======================================================================== */ | |
81 | /* Task support code */ | |
82 | /* ======================================================================== */ | |
83 | ||
84 | struct bcom_task * | |
85 | bcom_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 | } | |
108 | EXPORT_SYMBOL_GPL(bcom_fec_rx_init); | |
109 | ||
110 | int | |
111 | bcom_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 | } | |
155 | EXPORT_SYMBOL_GPL(bcom_fec_rx_reset); | |
156 | ||
157 | void | |
158 | bcom_fec_rx_release(struct bcom_task *tsk) | |
159 | { | |
160 | /* Nothing special for the FEC tasks */ | |
161 | bcom_task_free(tsk); | |
162 | } | |
163 | EXPORT_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 */ | |
170 | static 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 | ||
186 | struct bcom_task * | |
187 | bcom_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 | } | |
209 | EXPORT_SYMBOL_GPL(bcom_fec_tx_init); | |
210 | ||
211 | int | |
212 | bcom_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 | } | |
256 | EXPORT_SYMBOL_GPL(bcom_fec_tx_reset); | |
257 | ||
258 | void | |
259 | bcom_fec_tx_release(struct bcom_task *tsk) | |
260 | { | |
261 | /* Nothing special for the FEC tasks */ | |
262 | bcom_task_free(tsk); | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(bcom_fec_tx_release); | |
265 | ||
266 | ||
267 | MODULE_DESCRIPTION("BestComm FEC tasks driver"); | |
268 | MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>"); | |
269 | MODULE_LICENSE("GPL v2"); | |
270 |