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7acb9391 SM |
1 | /* |
2 | * Driver for MPC52xx processor BestComm General Buffer Descriptor | |
3 | * | |
4 | * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com> | |
5 | * Copyright (C) 2006 AppSpec Computer Technologies Corp. | |
6 | * Jeff Gibbons <jeff.gibbons@appspec.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published | |
10 | * by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
7acb9391 SM |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/types.h> | |
18 | #include <asm/errno.h> | |
19 | #include <asm/io.h> | |
20 | ||
21 | #include <asm/mpc52xx.h> | |
7ba6d6dc | 22 | #include <asm/mpc52xx_psc.h> |
7acb9391 | 23 | |
9a322993 PDM |
24 | #include <linux/fsl/bestcomm/bestcomm.h> |
25 | #include <linux/fsl/bestcomm/bestcomm_priv.h> | |
26 | #include <linux/fsl/bestcomm/gen_bd.h> | |
7acb9391 SM |
27 | |
28 | ||
29 | /* ======================================================================== */ | |
30 | /* Task image/var/inc */ | |
31 | /* ======================================================================== */ | |
32 | ||
33 | /* gen_bd tasks images */ | |
34 | extern u32 bcom_gen_bd_rx_task[]; | |
35 | extern u32 bcom_gen_bd_tx_task[]; | |
36 | ||
37 | /* rx task vars that need to be set before enabling the task */ | |
38 | struct bcom_gen_bd_rx_var { | |
39 | u32 enable; /* (u16*) address of task's control register */ | |
40 | u32 fifo; /* (u32*) address of gen_bd's fifo */ | |
41 | u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ | |
42 | u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ | |
43 | u32 bd_start; /* (struct bcom_bd*) current bd */ | |
44 | u32 buffer_size; /* size of receive buffer */ | |
45 | }; | |
46 | ||
47 | /* rx task incs that need to be set before enabling the task */ | |
48 | struct bcom_gen_bd_rx_inc { | |
49 | u16 pad0; | |
50 | s16 incr_bytes; | |
51 | u16 pad1; | |
52 | s16 incr_dst; | |
53 | }; | |
54 | ||
55 | /* tx task vars that need to be set before enabling the task */ | |
56 | struct bcom_gen_bd_tx_var { | |
57 | u32 fifo; /* (u32*) address of gen_bd's fifo */ | |
58 | u32 enable; /* (u16*) address of task's control register */ | |
59 | u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ | |
60 | u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ | |
61 | u32 bd_start; /* (struct bcom_bd*) current bd */ | |
62 | u32 buffer_size; /* set by uCode for each packet */ | |
63 | }; | |
64 | ||
65 | /* tx task incs that need to be set before enabling the task */ | |
66 | struct bcom_gen_bd_tx_inc { | |
67 | u16 pad0; | |
68 | s16 incr_bytes; | |
69 | u16 pad1; | |
70 | s16 incr_src; | |
71 | u16 pad2; | |
72 | s16 incr_src_ma; | |
73 | }; | |
74 | ||
75 | /* private structure */ | |
76 | struct bcom_gen_bd_priv { | |
77 | phys_addr_t fifo; | |
78 | int initiator; | |
79 | int ipr; | |
80 | int maxbufsize; | |
81 | }; | |
82 | ||
83 | ||
84 | /* ======================================================================== */ | |
85 | /* Task support code */ | |
86 | /* ======================================================================== */ | |
87 | ||
88 | struct bcom_task * | |
89 | bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo, | |
90 | int initiator, int ipr, int maxbufsize) | |
91 | { | |
92 | struct bcom_task *tsk; | |
93 | struct bcom_gen_bd_priv *priv; | |
94 | ||
95 | tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), | |
96 | sizeof(struct bcom_gen_bd_priv)); | |
97 | if (!tsk) | |
98 | return NULL; | |
99 | ||
100 | tsk->flags = BCOM_FLAGS_NONE; | |
101 | ||
102 | priv = tsk->priv; | |
103 | priv->fifo = fifo; | |
104 | priv->initiator = initiator; | |
105 | priv->ipr = ipr; | |
106 | priv->maxbufsize = maxbufsize; | |
107 | ||
108 | if (bcom_gen_bd_rx_reset(tsk)) { | |
109 | bcom_task_free(tsk); | |
110 | return NULL; | |
111 | } | |
112 | ||
113 | return tsk; | |
114 | } | |
115 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init); | |
116 | ||
117 | int | |
118 | bcom_gen_bd_rx_reset(struct bcom_task *tsk) | |
119 | { | |
120 | struct bcom_gen_bd_priv *priv = tsk->priv; | |
121 | struct bcom_gen_bd_rx_var *var; | |
122 | struct bcom_gen_bd_rx_inc *inc; | |
123 | ||
124 | /* Shutdown the task */ | |
125 | bcom_disable_task(tsk->tasknum); | |
126 | ||
127 | /* Reset the microcode */ | |
128 | var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum); | |
129 | inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum); | |
130 | ||
131 | if (bcom_load_image(tsk->tasknum, bcom_gen_bd_rx_task)) | |
132 | return -1; | |
133 | ||
134 | var->enable = bcom_eng->regs_base + | |
135 | offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); | |
136 | var->fifo = (u32) priv->fifo; | |
137 | var->bd_base = tsk->bd_pa; | |
138 | var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); | |
139 | var->bd_start = tsk->bd_pa; | |
140 | var->buffer_size = priv->maxbufsize; | |
141 | ||
142 | inc->incr_bytes = -(s16)sizeof(u32); | |
143 | inc->incr_dst = sizeof(u32); | |
144 | ||
145 | /* Reset the BDs */ | |
146 | tsk->index = 0; | |
147 | tsk->outdex = 0; | |
148 | ||
149 | memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); | |
150 | ||
151 | /* Configure some stuff */ | |
152 | bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA); | |
153 | bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); | |
154 | ||
155 | out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); | |
156 | bcom_set_initiator(tsk->tasknum, priv->initiator); | |
157 | ||
158 | out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ | |
159 | ||
160 | return 0; | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset); | |
163 | ||
164 | void | |
165 | bcom_gen_bd_rx_release(struct bcom_task *tsk) | |
166 | { | |
167 | /* Nothing special for the GenBD tasks */ | |
168 | bcom_task_free(tsk); | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release); | |
171 | ||
172 | ||
173 | extern struct bcom_task * | |
174 | bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo, | |
175 | int initiator, int ipr) | |
176 | { | |
177 | struct bcom_task *tsk; | |
178 | struct bcom_gen_bd_priv *priv; | |
179 | ||
180 | tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), | |
181 | sizeof(struct bcom_gen_bd_priv)); | |
182 | if (!tsk) | |
183 | return NULL; | |
184 | ||
185 | tsk->flags = BCOM_FLAGS_NONE; | |
186 | ||
187 | priv = tsk->priv; | |
188 | priv->fifo = fifo; | |
189 | priv->initiator = initiator; | |
190 | priv->ipr = ipr; | |
191 | ||
192 | if (bcom_gen_bd_tx_reset(tsk)) { | |
193 | bcom_task_free(tsk); | |
194 | return NULL; | |
195 | } | |
196 | ||
197 | return tsk; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init); | |
200 | ||
201 | int | |
202 | bcom_gen_bd_tx_reset(struct bcom_task *tsk) | |
203 | { | |
204 | struct bcom_gen_bd_priv *priv = tsk->priv; | |
205 | struct bcom_gen_bd_tx_var *var; | |
206 | struct bcom_gen_bd_tx_inc *inc; | |
207 | ||
208 | /* Shutdown the task */ | |
209 | bcom_disable_task(tsk->tasknum); | |
210 | ||
211 | /* Reset the microcode */ | |
212 | var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum); | |
213 | inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum); | |
214 | ||
215 | if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_task)) | |
216 | return -1; | |
217 | ||
218 | var->enable = bcom_eng->regs_base + | |
219 | offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); | |
220 | var->fifo = (u32) priv->fifo; | |
221 | var->bd_base = tsk->bd_pa; | |
222 | var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); | |
223 | var->bd_start = tsk->bd_pa; | |
224 | ||
225 | inc->incr_bytes = -(s16)sizeof(u32); | |
226 | inc->incr_src = sizeof(u32); | |
227 | inc->incr_src_ma = sizeof(u8); | |
228 | ||
229 | /* Reset the BDs */ | |
230 | tsk->index = 0; | |
231 | tsk->outdex = 0; | |
232 | ||
233 | memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); | |
234 | ||
235 | /* Configure some stuff */ | |
236 | bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA); | |
237 | bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); | |
238 | ||
239 | out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); | |
240 | bcom_set_initiator(tsk->tasknum, priv->initiator); | |
241 | ||
242 | out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ | |
243 | ||
244 | return 0; | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset); | |
247 | ||
248 | void | |
249 | bcom_gen_bd_tx_release(struct bcom_task *tsk) | |
250 | { | |
251 | /* Nothing special for the GenBD tasks */ | |
252 | bcom_task_free(tsk); | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release); | |
255 | ||
7ba6d6dc GL |
256 | /* --------------------------------------------------------------------- |
257 | * PSC support code | |
258 | */ | |
259 | ||
260 | /** | |
261 | * bcom_psc_parameters - Bestcomm initialization value table for PSC devices | |
262 | * | |
263 | * This structure is only used internally. It is a lookup table for PSC | |
264 | * specific parameters to bestcomm tasks. | |
265 | */ | |
266 | static struct bcom_psc_params { | |
267 | int rx_initiator; | |
268 | int rx_ipr; | |
269 | int tx_initiator; | |
270 | int tx_ipr; | |
271 | } bcom_psc_params[] = { | |
272 | [0] = { | |
273 | .rx_initiator = BCOM_INITIATOR_PSC1_RX, | |
274 | .rx_ipr = BCOM_IPR_PSC1_RX, | |
275 | .tx_initiator = BCOM_INITIATOR_PSC1_TX, | |
276 | .tx_ipr = BCOM_IPR_PSC1_TX, | |
277 | }, | |
278 | [1] = { | |
279 | .rx_initiator = BCOM_INITIATOR_PSC2_RX, | |
280 | .rx_ipr = BCOM_IPR_PSC2_RX, | |
281 | .tx_initiator = BCOM_INITIATOR_PSC2_TX, | |
282 | .tx_ipr = BCOM_IPR_PSC2_TX, | |
283 | }, | |
284 | [2] = { | |
285 | .rx_initiator = BCOM_INITIATOR_PSC3_RX, | |
286 | .rx_ipr = BCOM_IPR_PSC3_RX, | |
287 | .tx_initiator = BCOM_INITIATOR_PSC3_TX, | |
288 | .tx_ipr = BCOM_IPR_PSC3_TX, | |
289 | }, | |
290 | [3] = { | |
291 | .rx_initiator = BCOM_INITIATOR_PSC4_RX, | |
292 | .rx_ipr = BCOM_IPR_PSC4_RX, | |
293 | .tx_initiator = BCOM_INITIATOR_PSC4_TX, | |
294 | .tx_ipr = BCOM_IPR_PSC4_TX, | |
295 | }, | |
296 | [4] = { | |
297 | .rx_initiator = BCOM_INITIATOR_PSC5_RX, | |
298 | .rx_ipr = BCOM_IPR_PSC5_RX, | |
299 | .tx_initiator = BCOM_INITIATOR_PSC5_TX, | |
300 | .tx_ipr = BCOM_IPR_PSC5_TX, | |
301 | }, | |
302 | [5] = { | |
303 | .rx_initiator = BCOM_INITIATOR_PSC6_RX, | |
304 | .rx_ipr = BCOM_IPR_PSC6_RX, | |
305 | .tx_initiator = BCOM_INITIATOR_PSC6_TX, | |
306 | .tx_ipr = BCOM_IPR_PSC6_TX, | |
307 | }, | |
308 | }; | |
309 | ||
310 | /** | |
311 | * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port | |
312 | * @psc_num: Number of the PSC to allocate a task for | |
313 | * @queue_len: number of buffer descriptors to allocate for the task | |
314 | * @fifo: physical address of FIFO register | |
315 | * @maxbufsize: Maximum receive data size in bytes. | |
316 | * | |
317 | * Allocate a bestcomm task structure for receiving data from a PSC. | |
318 | */ | |
319 | struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len, | |
320 | phys_addr_t fifo, int maxbufsize) | |
321 | { | |
322 | if (psc_num >= MPC52xx_PSC_MAXNUM) | |
323 | return NULL; | |
324 | ||
325 | return bcom_gen_bd_rx_init(queue_len, fifo, | |
326 | bcom_psc_params[psc_num].rx_initiator, | |
327 | bcom_psc_params[psc_num].rx_ipr, | |
328 | maxbufsize); | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init); | |
331 | ||
332 | /** | |
333 | * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port | |
334 | * @psc_num: Number of the PSC to allocate a task for | |
335 | * @queue_len: number of buffer descriptors to allocate for the task | |
336 | * @fifo: physical address of FIFO register | |
337 | * | |
338 | * Allocate a bestcomm task structure for transmitting data to a PSC. | |
339 | */ | |
340 | struct bcom_task * | |
341 | bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo) | |
342 | { | |
343 | struct psc; | |
344 | return bcom_gen_bd_tx_init(queue_len, fifo, | |
345 | bcom_psc_params[psc_num].tx_initiator, | |
346 | bcom_psc_params[psc_num].tx_ipr); | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init); | |
349 | ||
7acb9391 SM |
350 | |
351 | MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver"); | |
352 | MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>"); | |
353 | MODULE_LICENSE("GPL v2"); | |
354 |