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b7d861d9 BK |
1 | /* |
2 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
b3040e40 JB |
4 | * |
5 | * Copyright (C) 2010 Samsung Electronics Co. Ltd. | |
6 | * Jaswinder Singh <jassi.brar@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
b7d861d9 | 14 | #include <linux/kernel.h> |
b3040e40 JB |
15 | #include <linux/io.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/module.h> | |
b7d861d9 BK |
19 | #include <linux/string.h> |
20 | #include <linux/delay.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/dma-mapping.h> | |
b3040e40 | 23 | #include <linux/dmaengine.h> |
b3040e40 JB |
24 | #include <linux/amba/bus.h> |
25 | #include <linux/amba/pl330.h> | |
1b9bb715 | 26 | #include <linux/scatterlist.h> |
93ed5544 | 27 | #include <linux/of.h> |
b3040e40 | 28 | |
d2ebfb33 | 29 | #include "dmaengine.h" |
b7d861d9 BK |
30 | #define PL330_MAX_CHAN 8 |
31 | #define PL330_MAX_IRQS 32 | |
32 | #define PL330_MAX_PERI 32 | |
33 | ||
34 | enum pl330_srccachectrl { | |
35 | SCCTRL0, /* Noncacheable and nonbufferable */ | |
36 | SCCTRL1, /* Bufferable only */ | |
37 | SCCTRL2, /* Cacheable, but do not allocate */ | |
38 | SCCTRL3, /* Cacheable and bufferable, but do not allocate */ | |
39 | SINVALID1, | |
40 | SINVALID2, | |
41 | SCCTRL6, /* Cacheable write-through, allocate on reads only */ | |
42 | SCCTRL7, /* Cacheable write-back, allocate on reads only */ | |
43 | }; | |
44 | ||
45 | enum pl330_dstcachectrl { | |
46 | DCCTRL0, /* Noncacheable and nonbufferable */ | |
47 | DCCTRL1, /* Bufferable only */ | |
48 | DCCTRL2, /* Cacheable, but do not allocate */ | |
49 | DCCTRL3, /* Cacheable and bufferable, but do not allocate */ | |
ef08e782 | 50 | DINVALID1, /* AWCACHE = 0x1000 */ |
b7d861d9 BK |
51 | DINVALID2, |
52 | DCCTRL6, /* Cacheable write-through, allocate on writes only */ | |
53 | DCCTRL7, /* Cacheable write-back, allocate on writes only */ | |
54 | }; | |
55 | ||
56 | enum pl330_byteswap { | |
57 | SWAP_NO, | |
58 | SWAP_2, | |
59 | SWAP_4, | |
60 | SWAP_8, | |
61 | SWAP_16, | |
62 | }; | |
63 | ||
64 | enum pl330_reqtype { | |
65 | MEMTOMEM, | |
66 | MEMTODEV, | |
67 | DEVTOMEM, | |
68 | DEVTODEV, | |
69 | }; | |
70 | ||
71 | /* Register and Bit field Definitions */ | |
72 | #define DS 0x0 | |
73 | #define DS_ST_STOP 0x0 | |
74 | #define DS_ST_EXEC 0x1 | |
75 | #define DS_ST_CMISS 0x2 | |
76 | #define DS_ST_UPDTPC 0x3 | |
77 | #define DS_ST_WFE 0x4 | |
78 | #define DS_ST_ATBRR 0x5 | |
79 | #define DS_ST_QBUSY 0x6 | |
80 | #define DS_ST_WFP 0x7 | |
81 | #define DS_ST_KILL 0x8 | |
82 | #define DS_ST_CMPLT 0x9 | |
83 | #define DS_ST_FLTCMP 0xe | |
84 | #define DS_ST_FAULT 0xf | |
85 | ||
86 | #define DPC 0x4 | |
87 | #define INTEN 0x20 | |
88 | #define ES 0x24 | |
89 | #define INTSTATUS 0x28 | |
90 | #define INTCLR 0x2c | |
91 | #define FSM 0x30 | |
92 | #define FSC 0x34 | |
93 | #define FTM 0x38 | |
94 | ||
95 | #define _FTC 0x40 | |
96 | #define FTC(n) (_FTC + (n)*0x4) | |
97 | ||
98 | #define _CS 0x100 | |
99 | #define CS(n) (_CS + (n)*0x8) | |
100 | #define CS_CNS (1 << 21) | |
101 | ||
102 | #define _CPC 0x104 | |
103 | #define CPC(n) (_CPC + (n)*0x8) | |
104 | ||
105 | #define _SA 0x400 | |
106 | #define SA(n) (_SA + (n)*0x20) | |
107 | ||
108 | #define _DA 0x404 | |
109 | #define DA(n) (_DA + (n)*0x20) | |
110 | ||
111 | #define _CC 0x408 | |
112 | #define CC(n) (_CC + (n)*0x20) | |
113 | ||
114 | #define CC_SRCINC (1 << 0) | |
115 | #define CC_DSTINC (1 << 14) | |
116 | #define CC_SRCPRI (1 << 8) | |
117 | #define CC_DSTPRI (1 << 22) | |
118 | #define CC_SRCNS (1 << 9) | |
119 | #define CC_DSTNS (1 << 23) | |
120 | #define CC_SRCIA (1 << 10) | |
121 | #define CC_DSTIA (1 << 24) | |
122 | #define CC_SRCBRSTLEN_SHFT 4 | |
123 | #define CC_DSTBRSTLEN_SHFT 18 | |
124 | #define CC_SRCBRSTSIZE_SHFT 1 | |
125 | #define CC_DSTBRSTSIZE_SHFT 15 | |
126 | #define CC_SRCCCTRL_SHFT 11 | |
127 | #define CC_SRCCCTRL_MASK 0x7 | |
128 | #define CC_DSTCCTRL_SHFT 25 | |
129 | #define CC_DRCCCTRL_MASK 0x7 | |
130 | #define CC_SWAP_SHFT 28 | |
131 | ||
132 | #define _LC0 0x40c | |
133 | #define LC0(n) (_LC0 + (n)*0x20) | |
134 | ||
135 | #define _LC1 0x410 | |
136 | #define LC1(n) (_LC1 + (n)*0x20) | |
137 | ||
138 | #define DBGSTATUS 0xd00 | |
139 | #define DBG_BUSY (1 << 0) | |
140 | ||
141 | #define DBGCMD 0xd04 | |
142 | #define DBGINST0 0xd08 | |
143 | #define DBGINST1 0xd0c | |
144 | ||
145 | #define CR0 0xe00 | |
146 | #define CR1 0xe04 | |
147 | #define CR2 0xe08 | |
148 | #define CR3 0xe0c | |
149 | #define CR4 0xe10 | |
150 | #define CRD 0xe14 | |
151 | ||
152 | #define PERIPH_ID 0xfe0 | |
3ecf51a4 BK |
153 | #define PERIPH_REV_SHIFT 20 |
154 | #define PERIPH_REV_MASK 0xf | |
155 | #define PERIPH_REV_R0P0 0 | |
156 | #define PERIPH_REV_R1P0 1 | |
157 | #define PERIPH_REV_R1P1 2 | |
b7d861d9 BK |
158 | #define PCELL_ID 0xff0 |
159 | ||
160 | #define CR0_PERIPH_REQ_SET (1 << 0) | |
161 | #define CR0_BOOT_EN_SET (1 << 1) | |
162 | #define CR0_BOOT_MAN_NS (1 << 2) | |
163 | #define CR0_NUM_CHANS_SHIFT 4 | |
164 | #define CR0_NUM_CHANS_MASK 0x7 | |
165 | #define CR0_NUM_PERIPH_SHIFT 12 | |
166 | #define CR0_NUM_PERIPH_MASK 0x1f | |
167 | #define CR0_NUM_EVENTS_SHIFT 17 | |
168 | #define CR0_NUM_EVENTS_MASK 0x1f | |
169 | ||
170 | #define CR1_ICACHE_LEN_SHIFT 0 | |
171 | #define CR1_ICACHE_LEN_MASK 0x7 | |
172 | #define CR1_NUM_ICACHELINES_SHIFT 4 | |
173 | #define CR1_NUM_ICACHELINES_MASK 0xf | |
174 | ||
175 | #define CRD_DATA_WIDTH_SHIFT 0 | |
176 | #define CRD_DATA_WIDTH_MASK 0x7 | |
177 | #define CRD_WR_CAP_SHIFT 4 | |
178 | #define CRD_WR_CAP_MASK 0x7 | |
179 | #define CRD_WR_Q_DEP_SHIFT 8 | |
180 | #define CRD_WR_Q_DEP_MASK 0xf | |
181 | #define CRD_RD_CAP_SHIFT 12 | |
182 | #define CRD_RD_CAP_MASK 0x7 | |
183 | #define CRD_RD_Q_DEP_SHIFT 16 | |
184 | #define CRD_RD_Q_DEP_MASK 0xf | |
185 | #define CRD_DATA_BUFF_SHIFT 20 | |
186 | #define CRD_DATA_BUFF_MASK 0x3ff | |
187 | ||
188 | #define PART 0x330 | |
189 | #define DESIGNER 0x41 | |
190 | #define REVISION 0x0 | |
191 | #define INTEG_CFG 0x0 | |
192 | #define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12)) | |
193 | ||
194 | #define PCELL_ID_VAL 0xb105f00d | |
195 | ||
196 | #define PL330_STATE_STOPPED (1 << 0) | |
197 | #define PL330_STATE_EXECUTING (1 << 1) | |
198 | #define PL330_STATE_WFE (1 << 2) | |
199 | #define PL330_STATE_FAULTING (1 << 3) | |
200 | #define PL330_STATE_COMPLETING (1 << 4) | |
201 | #define PL330_STATE_WFP (1 << 5) | |
202 | #define PL330_STATE_KILLING (1 << 6) | |
203 | #define PL330_STATE_FAULT_COMPLETING (1 << 7) | |
204 | #define PL330_STATE_CACHEMISS (1 << 8) | |
205 | #define PL330_STATE_UPDTPC (1 << 9) | |
206 | #define PL330_STATE_ATBARRIER (1 << 10) | |
207 | #define PL330_STATE_QUEUEBUSY (1 << 11) | |
208 | #define PL330_STATE_INVALID (1 << 15) | |
209 | ||
210 | #define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \ | |
211 | | PL330_STATE_WFE | PL330_STATE_FAULTING) | |
212 | ||
213 | #define CMD_DMAADDH 0x54 | |
214 | #define CMD_DMAEND 0x00 | |
215 | #define CMD_DMAFLUSHP 0x35 | |
216 | #define CMD_DMAGO 0xa0 | |
217 | #define CMD_DMALD 0x04 | |
218 | #define CMD_DMALDP 0x25 | |
219 | #define CMD_DMALP 0x20 | |
220 | #define CMD_DMALPEND 0x28 | |
221 | #define CMD_DMAKILL 0x01 | |
222 | #define CMD_DMAMOV 0xbc | |
223 | #define CMD_DMANOP 0x18 | |
224 | #define CMD_DMARMB 0x12 | |
225 | #define CMD_DMASEV 0x34 | |
226 | #define CMD_DMAST 0x08 | |
227 | #define CMD_DMASTP 0x29 | |
228 | #define CMD_DMASTZ 0x0c | |
229 | #define CMD_DMAWFE 0x36 | |
230 | #define CMD_DMAWFP 0x30 | |
231 | #define CMD_DMAWMB 0x13 | |
232 | ||
233 | #define SZ_DMAADDH 3 | |
234 | #define SZ_DMAEND 1 | |
235 | #define SZ_DMAFLUSHP 2 | |
236 | #define SZ_DMALD 1 | |
237 | #define SZ_DMALDP 2 | |
238 | #define SZ_DMALP 2 | |
239 | #define SZ_DMALPEND 2 | |
240 | #define SZ_DMAKILL 1 | |
241 | #define SZ_DMAMOV 6 | |
242 | #define SZ_DMANOP 1 | |
243 | #define SZ_DMARMB 1 | |
244 | #define SZ_DMASEV 2 | |
245 | #define SZ_DMAST 1 | |
246 | #define SZ_DMASTP 2 | |
247 | #define SZ_DMASTZ 1 | |
248 | #define SZ_DMAWFE 2 | |
249 | #define SZ_DMAWFP 2 | |
250 | #define SZ_DMAWMB 1 | |
251 | #define SZ_DMAGO 6 | |
252 | ||
253 | #define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1) | |
254 | #define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7)) | |
255 | ||
256 | #define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr)) | |
257 | #define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr)) | |
258 | ||
259 | /* | |
260 | * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req | |
261 | * at 1byte/burst for P<->M and M<->M respectively. | |
262 | * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req | |
263 | * should be enough for P<->M and M<->M respectively. | |
264 | */ | |
265 | #define MCODE_BUFF_PER_REQ 256 | |
266 | ||
267 | /* If the _pl330_req is available to the client */ | |
268 | #define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND) | |
269 | ||
270 | /* Use this _only_ to wait on transient states */ | |
271 | #define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax(); | |
272 | ||
273 | #ifdef PL330_DEBUG_MCGEN | |
274 | static unsigned cmd_line; | |
275 | #define PL330_DBGCMD_DUMP(off, x...) do { \ | |
276 | printk("%x:", cmd_line); \ | |
277 | printk(x); \ | |
278 | cmd_line += off; \ | |
279 | } while (0) | |
280 | #define PL330_DBGMC_START(addr) (cmd_line = addr) | |
281 | #else | |
282 | #define PL330_DBGCMD_DUMP(off, x...) do {} while (0) | |
283 | #define PL330_DBGMC_START(addr) do {} while (0) | |
284 | #endif | |
285 | ||
286 | /* The number of default descriptors */ | |
d2ebfb33 | 287 | |
b3040e40 JB |
288 | #define NR_DEFAULT_DESC 16 |
289 | ||
b7d861d9 BK |
290 | /* Populated by the PL330 core driver for DMA API driver's info */ |
291 | struct pl330_config { | |
292 | u32 periph_id; | |
293 | u32 pcell_id; | |
294 | #define DMAC_MODE_NS (1 << 0) | |
295 | unsigned int mode; | |
296 | unsigned int data_bus_width:10; /* In number of bits */ | |
297 | unsigned int data_buf_dep:10; | |
298 | unsigned int num_chan:4; | |
299 | unsigned int num_peri:6; | |
300 | u32 peri_ns; | |
301 | unsigned int num_events:6; | |
302 | u32 irq_ns; | |
303 | }; | |
304 | ||
305 | /* Handle to the DMAC provided to the PL330 core */ | |
306 | struct pl330_info { | |
307 | /* Owning device */ | |
308 | struct device *dev; | |
309 | /* Size of MicroCode buffers for each channel. */ | |
310 | unsigned mcbufsz; | |
311 | /* ioremap'ed address of PL330 registers. */ | |
312 | void __iomem *base; | |
313 | /* Client can freely use it. */ | |
314 | void *client_data; | |
315 | /* PL330 core data, Client must not touch it. */ | |
316 | void *pl330_data; | |
317 | /* Populated by the PL330 core driver during pl330_add */ | |
318 | struct pl330_config pcfg; | |
319 | /* | |
320 | * If the DMAC has some reset mechanism, then the | |
321 | * client may want to provide pointer to the method. | |
322 | */ | |
323 | void (*dmac_reset)(struct pl330_info *pi); | |
324 | }; | |
325 | ||
326 | /** | |
327 | * Request Configuration. | |
328 | * The PL330 core does not modify this and uses the last | |
329 | * working configuration if the request doesn't provide any. | |
330 | * | |
331 | * The Client may want to provide this info only for the | |
332 | * first request and a request with new settings. | |
333 | */ | |
334 | struct pl330_reqcfg { | |
335 | /* Address Incrementing */ | |
336 | unsigned dst_inc:1; | |
337 | unsigned src_inc:1; | |
338 | ||
339 | /* | |
340 | * For now, the SRC & DST protection levels | |
341 | * and burst size/length are assumed same. | |
342 | */ | |
343 | bool nonsecure; | |
344 | bool privileged; | |
345 | bool insnaccess; | |
346 | unsigned brst_len:5; | |
347 | unsigned brst_size:3; /* in power of 2 */ | |
348 | ||
349 | enum pl330_dstcachectrl dcctl; | |
350 | enum pl330_srccachectrl scctl; | |
351 | enum pl330_byteswap swap; | |
3ecf51a4 | 352 | struct pl330_config *pcfg; |
b7d861d9 BK |
353 | }; |
354 | ||
355 | /* | |
356 | * One cycle of DMAC operation. | |
357 | * There may be more than one xfer in a request. | |
358 | */ | |
359 | struct pl330_xfer { | |
360 | u32 src_addr; | |
361 | u32 dst_addr; | |
362 | /* Size to xfer */ | |
363 | u32 bytes; | |
364 | /* | |
365 | * Pointer to next xfer in the list. | |
366 | * The last xfer in the req must point to NULL. | |
367 | */ | |
368 | struct pl330_xfer *next; | |
369 | }; | |
370 | ||
371 | /* The xfer callbacks are made with one of these arguments. */ | |
372 | enum pl330_op_err { | |
373 | /* The all xfers in the request were success. */ | |
374 | PL330_ERR_NONE, | |
375 | /* If req aborted due to global error. */ | |
376 | PL330_ERR_ABORT, | |
377 | /* If req failed due to problem with Channel. */ | |
378 | PL330_ERR_FAIL, | |
379 | }; | |
380 | ||
381 | /* A request defining Scatter-Gather List ending with NULL xfer. */ | |
382 | struct pl330_req { | |
383 | enum pl330_reqtype rqtype; | |
384 | /* Index of peripheral for the xfer. */ | |
385 | unsigned peri:5; | |
386 | /* Unique token for this xfer, set by the client. */ | |
387 | void *token; | |
388 | /* Callback to be called after xfer. */ | |
389 | void (*xfer_cb)(void *token, enum pl330_op_err err); | |
390 | /* If NULL, req will be done at last set parameters. */ | |
391 | struct pl330_reqcfg *cfg; | |
392 | /* Pointer to first xfer in the request. */ | |
393 | struct pl330_xfer *x; | |
fdec53d5 JM |
394 | /* Hook to attach to DMAC's list of reqs with due callback */ |
395 | struct list_head rqd; | |
b7d861d9 BK |
396 | }; |
397 | ||
398 | /* | |
399 | * To know the status of the channel and DMAC, the client | |
400 | * provides a pointer to this structure. The PL330 core | |
401 | * fills it with current information. | |
402 | */ | |
403 | struct pl330_chanstatus { | |
404 | /* | |
405 | * If the DMAC engine halted due to some error, | |
406 | * the client should remove-add DMAC. | |
407 | */ | |
408 | bool dmac_halted; | |
409 | /* | |
410 | * If channel is halted due to some error, | |
411 | * the client should ABORT/FLUSH and START the channel. | |
412 | */ | |
413 | bool faulting; | |
414 | /* Location of last load */ | |
415 | u32 src_addr; | |
416 | /* Location of last store */ | |
417 | u32 dst_addr; | |
418 | /* | |
419 | * Pointer to the currently active req, NULL if channel is | |
420 | * inactive, even though the requests may be present. | |
421 | */ | |
422 | struct pl330_req *top_req; | |
423 | /* Pointer to req waiting second in the queue if any. */ | |
424 | struct pl330_req *wait_req; | |
425 | }; | |
426 | ||
427 | enum pl330_chan_op { | |
428 | /* Start the channel */ | |
429 | PL330_OP_START, | |
430 | /* Abort the active xfer */ | |
431 | PL330_OP_ABORT, | |
432 | /* Stop xfer and flush queue */ | |
433 | PL330_OP_FLUSH, | |
434 | }; | |
435 | ||
436 | struct _xfer_spec { | |
437 | u32 ccr; | |
438 | struct pl330_req *r; | |
439 | struct pl330_xfer *x; | |
440 | }; | |
441 | ||
442 | enum dmamov_dst { | |
443 | SAR = 0, | |
444 | CCR, | |
445 | DAR, | |
446 | }; | |
447 | ||
448 | enum pl330_dst { | |
449 | SRC = 0, | |
450 | DST, | |
451 | }; | |
452 | ||
453 | enum pl330_cond { | |
454 | SINGLE, | |
455 | BURST, | |
456 | ALWAYS, | |
457 | }; | |
458 | ||
459 | struct _pl330_req { | |
460 | u32 mc_bus; | |
461 | void *mc_cpu; | |
462 | /* Number of bytes taken to setup MC for the req */ | |
463 | u32 mc_len; | |
464 | struct pl330_req *r; | |
b7d861d9 BK |
465 | }; |
466 | ||
467 | /* ToBeDone for tasklet */ | |
468 | struct _pl330_tbd { | |
469 | bool reset_dmac; | |
470 | bool reset_mngr; | |
471 | u8 reset_chan; | |
472 | }; | |
473 | ||
474 | /* A DMAC Thread */ | |
475 | struct pl330_thread { | |
476 | u8 id; | |
477 | int ev; | |
478 | /* If the channel is not yet acquired by any client */ | |
479 | bool free; | |
480 | /* Parent DMAC */ | |
481 | struct pl330_dmac *dmac; | |
482 | /* Only two at a time */ | |
483 | struct _pl330_req req[2]; | |
484 | /* Index of the last enqueued request */ | |
485 | unsigned lstenq; | |
486 | /* Index of the last submitted request or -1 if the DMA is stopped */ | |
487 | int req_running; | |
488 | }; | |
489 | ||
490 | enum pl330_dmac_state { | |
491 | UNINIT, | |
492 | INIT, | |
493 | DYING, | |
494 | }; | |
495 | ||
496 | /* A DMAC */ | |
497 | struct pl330_dmac { | |
498 | spinlock_t lock; | |
499 | /* Holds list of reqs with due callbacks */ | |
500 | struct list_head req_done; | |
501 | /* Pointer to platform specific stuff */ | |
502 | struct pl330_info *pinfo; | |
503 | /* Maximum possible events/irqs */ | |
504 | int events[32]; | |
505 | /* BUS address of MicroCode buffer */ | |
506 | u32 mcode_bus; | |
507 | /* CPU address of MicroCode buffer */ | |
508 | void *mcode_cpu; | |
509 | /* List of all Channel threads */ | |
510 | struct pl330_thread *channels; | |
511 | /* Pointer to the MANAGER thread */ | |
512 | struct pl330_thread *manager; | |
513 | /* To handle bad news in interrupt */ | |
514 | struct tasklet_struct tasks; | |
515 | struct _pl330_tbd dmac_tbd; | |
516 | /* State of DMAC operation */ | |
517 | enum pl330_dmac_state state; | |
518 | }; | |
519 | ||
b3040e40 JB |
520 | enum desc_status { |
521 | /* In the DMAC pool */ | |
522 | FREE, | |
523 | /* | |
d73111c6 | 524 | * Allocated to some channel during prep_xxx |
b3040e40 JB |
525 | * Also may be sitting on the work_list. |
526 | */ | |
527 | PREP, | |
528 | /* | |
529 | * Sitting on the work_list and already submitted | |
530 | * to the PL330 core. Not more than two descriptors | |
531 | * of a channel can be BUSY at any time. | |
532 | */ | |
533 | BUSY, | |
534 | /* | |
535 | * Sitting on the channel work_list but xfer done | |
536 | * by PL330 core | |
537 | */ | |
538 | DONE, | |
539 | }; | |
540 | ||
541 | struct dma_pl330_chan { | |
542 | /* Schedule desc completion */ | |
543 | struct tasklet_struct task; | |
544 | ||
545 | /* DMA-Engine Channel */ | |
546 | struct dma_chan chan; | |
547 | ||
b3040e40 JB |
548 | /* List of to be xfered descriptors */ |
549 | struct list_head work_list; | |
550 | ||
551 | /* Pointer to the DMAC that manages this channel, | |
552 | * NULL if the channel is available to be acquired. | |
553 | * As the parent, this DMAC also provides descriptors | |
554 | * to the channel. | |
555 | */ | |
556 | struct dma_pl330_dmac *dmac; | |
557 | ||
558 | /* To protect channel manipulation */ | |
559 | spinlock_t lock; | |
560 | ||
561 | /* Token of a hardware channel thread of PL330 DMAC | |
562 | * NULL if the channel is available to be acquired. | |
563 | */ | |
564 | void *pl330_chid; | |
1b9bb715 BK |
565 | |
566 | /* For D-to-M and M-to-D channels */ | |
567 | int burst_sz; /* the peripheral fifo width */ | |
1d0c1d60 | 568 | int burst_len; /* the number of burst */ |
1b9bb715 | 569 | dma_addr_t fifo_addr; |
42bc9cf4 BK |
570 | |
571 | /* for cyclic capability */ | |
572 | bool cyclic; | |
b3040e40 JB |
573 | }; |
574 | ||
575 | struct dma_pl330_dmac { | |
576 | struct pl330_info pif; | |
577 | ||
578 | /* DMA-Engine Device */ | |
579 | struct dma_device ddma; | |
580 | ||
581 | /* Pool of descriptors available for the DMAC's channels */ | |
582 | struct list_head desc_pool; | |
583 | /* To protect desc_pool manipulation */ | |
584 | spinlock_t pool_lock; | |
585 | ||
586 | /* Peripheral channels connected to this DMAC */ | |
4e0e6109 | 587 | struct dma_pl330_chan *peripherals; /* keep at end */ |
b3040e40 JB |
588 | }; |
589 | ||
590 | struct dma_pl330_desc { | |
591 | /* To attach to a queue as child */ | |
592 | struct list_head node; | |
593 | ||
594 | /* Descriptor for the DMA Engine API */ | |
595 | struct dma_async_tx_descriptor txd; | |
596 | ||
597 | /* Xfer for PL330 core */ | |
598 | struct pl330_xfer px; | |
599 | ||
600 | struct pl330_reqcfg rqcfg; | |
601 | struct pl330_req req; | |
602 | ||
603 | enum desc_status status; | |
604 | ||
605 | /* The channel which currently holds this desc */ | |
606 | struct dma_pl330_chan *pchan; | |
607 | }; | |
608 | ||
b7d861d9 BK |
609 | static inline void _callback(struct pl330_req *r, enum pl330_op_err err) |
610 | { | |
611 | if (r && r->xfer_cb) | |
612 | r->xfer_cb(r->token, err); | |
613 | } | |
614 | ||
615 | static inline bool _queue_empty(struct pl330_thread *thrd) | |
616 | { | |
617 | return (IS_FREE(&thrd->req[0]) && IS_FREE(&thrd->req[1])) | |
618 | ? true : false; | |
619 | } | |
620 | ||
621 | static inline bool _queue_full(struct pl330_thread *thrd) | |
622 | { | |
623 | return (IS_FREE(&thrd->req[0]) || IS_FREE(&thrd->req[1])) | |
624 | ? false : true; | |
625 | } | |
626 | ||
627 | static inline bool is_manager(struct pl330_thread *thrd) | |
628 | { | |
629 | struct pl330_dmac *pl330 = thrd->dmac; | |
630 | ||
631 | /* MANAGER is indexed at the end */ | |
632 | if (thrd->id == pl330->pinfo->pcfg.num_chan) | |
633 | return true; | |
634 | else | |
635 | return false; | |
636 | } | |
637 | ||
638 | /* If manager of the thread is in Non-Secure mode */ | |
639 | static inline bool _manager_ns(struct pl330_thread *thrd) | |
640 | { | |
641 | struct pl330_dmac *pl330 = thrd->dmac; | |
642 | ||
643 | return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false; | |
644 | } | |
645 | ||
646 | static inline u32 get_id(struct pl330_info *pi, u32 off) | |
647 | { | |
648 | void __iomem *regs = pi->base; | |
649 | u32 id = 0; | |
650 | ||
651 | id |= (readb(regs + off + 0x0) << 0); | |
652 | id |= (readb(regs + off + 0x4) << 8); | |
653 | id |= (readb(regs + off + 0x8) << 16); | |
654 | id |= (readb(regs + off + 0xc) << 24); | |
655 | ||
656 | return id; | |
657 | } | |
658 | ||
3ecf51a4 BK |
659 | static inline u32 get_revision(u32 periph_id) |
660 | { | |
661 | return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK; | |
662 | } | |
663 | ||
b7d861d9 BK |
664 | static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[], |
665 | enum pl330_dst da, u16 val) | |
666 | { | |
667 | if (dry_run) | |
668 | return SZ_DMAADDH; | |
669 | ||
670 | buf[0] = CMD_DMAADDH; | |
671 | buf[0] |= (da << 1); | |
672 | *((u16 *)&buf[1]) = val; | |
673 | ||
674 | PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n", | |
675 | da == 1 ? "DA" : "SA", val); | |
676 | ||
677 | return SZ_DMAADDH; | |
678 | } | |
679 | ||
680 | static inline u32 _emit_END(unsigned dry_run, u8 buf[]) | |
681 | { | |
682 | if (dry_run) | |
683 | return SZ_DMAEND; | |
684 | ||
685 | buf[0] = CMD_DMAEND; | |
686 | ||
687 | PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n"); | |
688 | ||
689 | return SZ_DMAEND; | |
690 | } | |
691 | ||
692 | static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri) | |
693 | { | |
694 | if (dry_run) | |
695 | return SZ_DMAFLUSHP; | |
696 | ||
697 | buf[0] = CMD_DMAFLUSHP; | |
698 | ||
699 | peri &= 0x1f; | |
700 | peri <<= 3; | |
701 | buf[1] = peri; | |
702 | ||
703 | PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3); | |
704 | ||
705 | return SZ_DMAFLUSHP; | |
706 | } | |
707 | ||
708 | static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond) | |
709 | { | |
710 | if (dry_run) | |
711 | return SZ_DMALD; | |
712 | ||
713 | buf[0] = CMD_DMALD; | |
714 | ||
715 | if (cond == SINGLE) | |
716 | buf[0] |= (0 << 1) | (1 << 0); | |
717 | else if (cond == BURST) | |
718 | buf[0] |= (1 << 1) | (1 << 0); | |
719 | ||
720 | PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n", | |
721 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); | |
722 | ||
723 | return SZ_DMALD; | |
724 | } | |
725 | ||
726 | static inline u32 _emit_LDP(unsigned dry_run, u8 buf[], | |
727 | enum pl330_cond cond, u8 peri) | |
728 | { | |
729 | if (dry_run) | |
730 | return SZ_DMALDP; | |
731 | ||
732 | buf[0] = CMD_DMALDP; | |
733 | ||
734 | if (cond == BURST) | |
735 | buf[0] |= (1 << 1); | |
736 | ||
737 | peri &= 0x1f; | |
738 | peri <<= 3; | |
739 | buf[1] = peri; | |
740 | ||
741 | PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n", | |
742 | cond == SINGLE ? 'S' : 'B', peri >> 3); | |
743 | ||
744 | return SZ_DMALDP; | |
745 | } | |
746 | ||
747 | static inline u32 _emit_LP(unsigned dry_run, u8 buf[], | |
748 | unsigned loop, u8 cnt) | |
749 | { | |
750 | if (dry_run) | |
751 | return SZ_DMALP; | |
752 | ||
753 | buf[0] = CMD_DMALP; | |
754 | ||
755 | if (loop) | |
756 | buf[0] |= (1 << 1); | |
757 | ||
758 | cnt--; /* DMAC increments by 1 internally */ | |
759 | buf[1] = cnt; | |
760 | ||
761 | PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt); | |
762 | ||
763 | return SZ_DMALP; | |
764 | } | |
765 | ||
766 | struct _arg_LPEND { | |
767 | enum pl330_cond cond; | |
768 | bool forever; | |
769 | unsigned loop; | |
770 | u8 bjump; | |
771 | }; | |
772 | ||
773 | static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[], | |
774 | const struct _arg_LPEND *arg) | |
775 | { | |
776 | enum pl330_cond cond = arg->cond; | |
777 | bool forever = arg->forever; | |
778 | unsigned loop = arg->loop; | |
779 | u8 bjump = arg->bjump; | |
780 | ||
781 | if (dry_run) | |
782 | return SZ_DMALPEND; | |
783 | ||
784 | buf[0] = CMD_DMALPEND; | |
785 | ||
786 | if (loop) | |
787 | buf[0] |= (1 << 2); | |
788 | ||
789 | if (!forever) | |
790 | buf[0] |= (1 << 4); | |
791 | ||
792 | if (cond == SINGLE) | |
793 | buf[0] |= (0 << 1) | (1 << 0); | |
794 | else if (cond == BURST) | |
795 | buf[0] |= (1 << 1) | (1 << 0); | |
796 | ||
797 | buf[1] = bjump; | |
798 | ||
799 | PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n", | |
800 | forever ? "FE" : "END", | |
801 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'), | |
802 | loop ? '1' : '0', | |
803 | bjump); | |
804 | ||
805 | return SZ_DMALPEND; | |
806 | } | |
807 | ||
808 | static inline u32 _emit_KILL(unsigned dry_run, u8 buf[]) | |
809 | { | |
810 | if (dry_run) | |
811 | return SZ_DMAKILL; | |
812 | ||
813 | buf[0] = CMD_DMAKILL; | |
814 | ||
815 | return SZ_DMAKILL; | |
816 | } | |
817 | ||
818 | static inline u32 _emit_MOV(unsigned dry_run, u8 buf[], | |
819 | enum dmamov_dst dst, u32 val) | |
820 | { | |
821 | if (dry_run) | |
822 | return SZ_DMAMOV; | |
823 | ||
824 | buf[0] = CMD_DMAMOV; | |
825 | buf[1] = dst; | |
826 | *((u32 *)&buf[2]) = val; | |
827 | ||
828 | PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n", | |
829 | dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val); | |
830 | ||
831 | return SZ_DMAMOV; | |
832 | } | |
833 | ||
834 | static inline u32 _emit_NOP(unsigned dry_run, u8 buf[]) | |
835 | { | |
836 | if (dry_run) | |
837 | return SZ_DMANOP; | |
838 | ||
839 | buf[0] = CMD_DMANOP; | |
840 | ||
841 | PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n"); | |
842 | ||
843 | return SZ_DMANOP; | |
844 | } | |
845 | ||
846 | static inline u32 _emit_RMB(unsigned dry_run, u8 buf[]) | |
847 | { | |
848 | if (dry_run) | |
849 | return SZ_DMARMB; | |
850 | ||
851 | buf[0] = CMD_DMARMB; | |
852 | ||
853 | PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n"); | |
854 | ||
855 | return SZ_DMARMB; | |
856 | } | |
857 | ||
858 | static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev) | |
859 | { | |
860 | if (dry_run) | |
861 | return SZ_DMASEV; | |
862 | ||
863 | buf[0] = CMD_DMASEV; | |
864 | ||
865 | ev &= 0x1f; | |
866 | ev <<= 3; | |
867 | buf[1] = ev; | |
868 | ||
869 | PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3); | |
870 | ||
871 | return SZ_DMASEV; | |
872 | } | |
873 | ||
874 | static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond) | |
875 | { | |
876 | if (dry_run) | |
877 | return SZ_DMAST; | |
878 | ||
879 | buf[0] = CMD_DMAST; | |
880 | ||
881 | if (cond == SINGLE) | |
882 | buf[0] |= (0 << 1) | (1 << 0); | |
883 | else if (cond == BURST) | |
884 | buf[0] |= (1 << 1) | (1 << 0); | |
885 | ||
886 | PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n", | |
887 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); | |
888 | ||
889 | return SZ_DMAST; | |
890 | } | |
891 | ||
892 | static inline u32 _emit_STP(unsigned dry_run, u8 buf[], | |
893 | enum pl330_cond cond, u8 peri) | |
894 | { | |
895 | if (dry_run) | |
896 | return SZ_DMASTP; | |
897 | ||
898 | buf[0] = CMD_DMASTP; | |
899 | ||
900 | if (cond == BURST) | |
901 | buf[0] |= (1 << 1); | |
902 | ||
903 | peri &= 0x1f; | |
904 | peri <<= 3; | |
905 | buf[1] = peri; | |
906 | ||
907 | PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n", | |
908 | cond == SINGLE ? 'S' : 'B', peri >> 3); | |
909 | ||
910 | return SZ_DMASTP; | |
911 | } | |
912 | ||
913 | static inline u32 _emit_STZ(unsigned dry_run, u8 buf[]) | |
914 | { | |
915 | if (dry_run) | |
916 | return SZ_DMASTZ; | |
917 | ||
918 | buf[0] = CMD_DMASTZ; | |
919 | ||
920 | PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n"); | |
921 | ||
922 | return SZ_DMASTZ; | |
923 | } | |
924 | ||
925 | static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev, | |
926 | unsigned invalidate) | |
927 | { | |
928 | if (dry_run) | |
929 | return SZ_DMAWFE; | |
930 | ||
931 | buf[0] = CMD_DMAWFE; | |
932 | ||
933 | ev &= 0x1f; | |
934 | ev <<= 3; | |
935 | buf[1] = ev; | |
936 | ||
937 | if (invalidate) | |
938 | buf[1] |= (1 << 1); | |
939 | ||
940 | PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n", | |
941 | ev >> 3, invalidate ? ", I" : ""); | |
942 | ||
943 | return SZ_DMAWFE; | |
944 | } | |
945 | ||
946 | static inline u32 _emit_WFP(unsigned dry_run, u8 buf[], | |
947 | enum pl330_cond cond, u8 peri) | |
948 | { | |
949 | if (dry_run) | |
950 | return SZ_DMAWFP; | |
951 | ||
952 | buf[0] = CMD_DMAWFP; | |
953 | ||
954 | if (cond == SINGLE) | |
955 | buf[0] |= (0 << 1) | (0 << 0); | |
956 | else if (cond == BURST) | |
957 | buf[0] |= (1 << 1) | (0 << 0); | |
958 | else | |
959 | buf[0] |= (0 << 1) | (1 << 0); | |
960 | ||
961 | peri &= 0x1f; | |
962 | peri <<= 3; | |
963 | buf[1] = peri; | |
964 | ||
965 | PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n", | |
966 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3); | |
967 | ||
968 | return SZ_DMAWFP; | |
969 | } | |
970 | ||
971 | static inline u32 _emit_WMB(unsigned dry_run, u8 buf[]) | |
972 | { | |
973 | if (dry_run) | |
974 | return SZ_DMAWMB; | |
975 | ||
976 | buf[0] = CMD_DMAWMB; | |
977 | ||
978 | PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n"); | |
979 | ||
980 | return SZ_DMAWMB; | |
981 | } | |
982 | ||
983 | struct _arg_GO { | |
984 | u8 chan; | |
985 | u32 addr; | |
986 | unsigned ns; | |
987 | }; | |
988 | ||
989 | static inline u32 _emit_GO(unsigned dry_run, u8 buf[], | |
990 | const struct _arg_GO *arg) | |
991 | { | |
992 | u8 chan = arg->chan; | |
993 | u32 addr = arg->addr; | |
994 | unsigned ns = arg->ns; | |
995 | ||
996 | if (dry_run) | |
997 | return SZ_DMAGO; | |
998 | ||
999 | buf[0] = CMD_DMAGO; | |
1000 | buf[0] |= (ns << 1); | |
1001 | ||
1002 | buf[1] = chan & 0x7; | |
1003 | ||
1004 | *((u32 *)&buf[2]) = addr; | |
1005 | ||
1006 | return SZ_DMAGO; | |
1007 | } | |
1008 | ||
1009 | #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) | |
1010 | ||
1011 | /* Returns Time-Out */ | |
1012 | static bool _until_dmac_idle(struct pl330_thread *thrd) | |
1013 | { | |
1014 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1015 | unsigned long loops = msecs_to_loops(5); | |
1016 | ||
1017 | do { | |
1018 | /* Until Manager is Idle */ | |
1019 | if (!(readl(regs + DBGSTATUS) & DBG_BUSY)) | |
1020 | break; | |
1021 | ||
1022 | cpu_relax(); | |
1023 | } while (--loops); | |
1024 | ||
1025 | if (!loops) | |
1026 | return true; | |
1027 | ||
1028 | return false; | |
1029 | } | |
1030 | ||
1031 | static inline void _execute_DBGINSN(struct pl330_thread *thrd, | |
1032 | u8 insn[], bool as_manager) | |
1033 | { | |
1034 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1035 | u32 val; | |
1036 | ||
1037 | val = (insn[0] << 16) | (insn[1] << 24); | |
1038 | if (!as_manager) { | |
1039 | val |= (1 << 0); | |
1040 | val |= (thrd->id << 8); /* Channel Number */ | |
1041 | } | |
1042 | writel(val, regs + DBGINST0); | |
1043 | ||
1044 | val = *((u32 *)&insn[2]); | |
1045 | writel(val, regs + DBGINST1); | |
1046 | ||
1047 | /* If timed out due to halted state-machine */ | |
1048 | if (_until_dmac_idle(thrd)) { | |
1049 | dev_err(thrd->dmac->pinfo->dev, "DMAC halted!\n"); | |
1050 | return; | |
1051 | } | |
1052 | ||
1053 | /* Get going */ | |
1054 | writel(0, regs + DBGCMD); | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Mark a _pl330_req as free. | |
1059 | * We do it by writing DMAEND as the first instruction | |
1060 | * because no valid request is going to have DMAEND as | |
1061 | * its first instruction to execute. | |
1062 | */ | |
1063 | static void mark_free(struct pl330_thread *thrd, int idx) | |
1064 | { | |
1065 | struct _pl330_req *req = &thrd->req[idx]; | |
1066 | ||
1067 | _emit_END(0, req->mc_cpu); | |
1068 | req->mc_len = 0; | |
1069 | ||
1070 | thrd->req_running = -1; | |
1071 | } | |
1072 | ||
1073 | static inline u32 _state(struct pl330_thread *thrd) | |
1074 | { | |
1075 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1076 | u32 val; | |
1077 | ||
1078 | if (is_manager(thrd)) | |
1079 | val = readl(regs + DS) & 0xf; | |
1080 | else | |
1081 | val = readl(regs + CS(thrd->id)) & 0xf; | |
1082 | ||
1083 | switch (val) { | |
1084 | case DS_ST_STOP: | |
1085 | return PL330_STATE_STOPPED; | |
1086 | case DS_ST_EXEC: | |
1087 | return PL330_STATE_EXECUTING; | |
1088 | case DS_ST_CMISS: | |
1089 | return PL330_STATE_CACHEMISS; | |
1090 | case DS_ST_UPDTPC: | |
1091 | return PL330_STATE_UPDTPC; | |
1092 | case DS_ST_WFE: | |
1093 | return PL330_STATE_WFE; | |
1094 | case DS_ST_FAULT: | |
1095 | return PL330_STATE_FAULTING; | |
1096 | case DS_ST_ATBRR: | |
1097 | if (is_manager(thrd)) | |
1098 | return PL330_STATE_INVALID; | |
1099 | else | |
1100 | return PL330_STATE_ATBARRIER; | |
1101 | case DS_ST_QBUSY: | |
1102 | if (is_manager(thrd)) | |
1103 | return PL330_STATE_INVALID; | |
1104 | else | |
1105 | return PL330_STATE_QUEUEBUSY; | |
1106 | case DS_ST_WFP: | |
1107 | if (is_manager(thrd)) | |
1108 | return PL330_STATE_INVALID; | |
1109 | else | |
1110 | return PL330_STATE_WFP; | |
1111 | case DS_ST_KILL: | |
1112 | if (is_manager(thrd)) | |
1113 | return PL330_STATE_INVALID; | |
1114 | else | |
1115 | return PL330_STATE_KILLING; | |
1116 | case DS_ST_CMPLT: | |
1117 | if (is_manager(thrd)) | |
1118 | return PL330_STATE_INVALID; | |
1119 | else | |
1120 | return PL330_STATE_COMPLETING; | |
1121 | case DS_ST_FLTCMP: | |
1122 | if (is_manager(thrd)) | |
1123 | return PL330_STATE_INVALID; | |
1124 | else | |
1125 | return PL330_STATE_FAULT_COMPLETING; | |
1126 | default: | |
1127 | return PL330_STATE_INVALID; | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | static void _stop(struct pl330_thread *thrd) | |
1132 | { | |
1133 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1134 | u8 insn[6] = {0, 0, 0, 0, 0, 0}; | |
1135 | ||
1136 | if (_state(thrd) == PL330_STATE_FAULT_COMPLETING) | |
1137 | UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); | |
1138 | ||
1139 | /* Return if nothing needs to be done */ | |
1140 | if (_state(thrd) == PL330_STATE_COMPLETING | |
1141 | || _state(thrd) == PL330_STATE_KILLING | |
1142 | || _state(thrd) == PL330_STATE_STOPPED) | |
1143 | return; | |
1144 | ||
1145 | _emit_KILL(0, insn); | |
1146 | ||
1147 | /* Stop generating interrupts for SEV */ | |
1148 | writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN); | |
1149 | ||
1150 | _execute_DBGINSN(thrd, insn, is_manager(thrd)); | |
1151 | } | |
1152 | ||
1153 | /* Start doing req 'idx' of thread 'thrd' */ | |
1154 | static bool _trigger(struct pl330_thread *thrd) | |
1155 | { | |
1156 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1157 | struct _pl330_req *req; | |
1158 | struct pl330_req *r; | |
1159 | struct _arg_GO go; | |
1160 | unsigned ns; | |
1161 | u8 insn[6] = {0, 0, 0, 0, 0, 0}; | |
1162 | int idx; | |
1163 | ||
1164 | /* Return if already ACTIVE */ | |
1165 | if (_state(thrd) != PL330_STATE_STOPPED) | |
1166 | return true; | |
1167 | ||
1168 | idx = 1 - thrd->lstenq; | |
1169 | if (!IS_FREE(&thrd->req[idx])) | |
1170 | req = &thrd->req[idx]; | |
1171 | else { | |
1172 | idx = thrd->lstenq; | |
1173 | if (!IS_FREE(&thrd->req[idx])) | |
1174 | req = &thrd->req[idx]; | |
1175 | else | |
1176 | req = NULL; | |
1177 | } | |
1178 | ||
1179 | /* Return if no request */ | |
1180 | if (!req || !req->r) | |
1181 | return true; | |
1182 | ||
1183 | r = req->r; | |
1184 | ||
1185 | if (r->cfg) | |
1186 | ns = r->cfg->nonsecure ? 1 : 0; | |
1187 | else if (readl(regs + CS(thrd->id)) & CS_CNS) | |
1188 | ns = 1; | |
1189 | else | |
1190 | ns = 0; | |
1191 | ||
1192 | /* See 'Abort Sources' point-4 at Page 2-25 */ | |
1193 | if (_manager_ns(thrd) && !ns) | |
1194 | dev_info(thrd->dmac->pinfo->dev, "%s:%d Recipe for ABORT!\n", | |
1195 | __func__, __LINE__); | |
1196 | ||
1197 | go.chan = thrd->id; | |
1198 | go.addr = req->mc_bus; | |
1199 | go.ns = ns; | |
1200 | _emit_GO(0, insn, &go); | |
1201 | ||
1202 | /* Set to generate interrupts for SEV */ | |
1203 | writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN); | |
1204 | ||
1205 | /* Only manager can execute GO */ | |
1206 | _execute_DBGINSN(thrd, insn, true); | |
1207 | ||
1208 | thrd->req_running = idx; | |
1209 | ||
1210 | return true; | |
1211 | } | |
1212 | ||
1213 | static bool _start(struct pl330_thread *thrd) | |
1214 | { | |
1215 | switch (_state(thrd)) { | |
1216 | case PL330_STATE_FAULT_COMPLETING: | |
1217 | UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); | |
1218 | ||
1219 | if (_state(thrd) == PL330_STATE_KILLING) | |
1220 | UNTIL(thrd, PL330_STATE_STOPPED) | |
1221 | ||
1222 | case PL330_STATE_FAULTING: | |
1223 | _stop(thrd); | |
1224 | ||
1225 | case PL330_STATE_KILLING: | |
1226 | case PL330_STATE_COMPLETING: | |
1227 | UNTIL(thrd, PL330_STATE_STOPPED) | |
1228 | ||
1229 | case PL330_STATE_STOPPED: | |
1230 | return _trigger(thrd); | |
1231 | ||
1232 | case PL330_STATE_WFP: | |
1233 | case PL330_STATE_QUEUEBUSY: | |
1234 | case PL330_STATE_ATBARRIER: | |
1235 | case PL330_STATE_UPDTPC: | |
1236 | case PL330_STATE_CACHEMISS: | |
1237 | case PL330_STATE_EXECUTING: | |
1238 | return true; | |
1239 | ||
1240 | case PL330_STATE_WFE: /* For RESUME, nothing yet */ | |
1241 | default: | |
1242 | return false; | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | static inline int _ldst_memtomem(unsigned dry_run, u8 buf[], | |
1247 | const struct _xfer_spec *pxs, int cyc) | |
1248 | { | |
1249 | int off = 0; | |
3ecf51a4 | 1250 | struct pl330_config *pcfg = pxs->r->cfg->pcfg; |
b7d861d9 | 1251 | |
3ecf51a4 BK |
1252 | /* check lock-up free version */ |
1253 | if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) { | |
1254 | while (cyc--) { | |
1255 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1256 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1257 | } | |
1258 | } else { | |
1259 | while (cyc--) { | |
1260 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1261 | off += _emit_RMB(dry_run, &buf[off]); | |
1262 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1263 | off += _emit_WMB(dry_run, &buf[off]); | |
1264 | } | |
b7d861d9 BK |
1265 | } |
1266 | ||
1267 | return off; | |
1268 | } | |
1269 | ||
1270 | static inline int _ldst_devtomem(unsigned dry_run, u8 buf[], | |
1271 | const struct _xfer_spec *pxs, int cyc) | |
1272 | { | |
1273 | int off = 0; | |
1274 | ||
1275 | while (cyc--) { | |
1276 | off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1277 | off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1278 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1279 | off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri); | |
1280 | } | |
1281 | ||
1282 | return off; | |
1283 | } | |
1284 | ||
1285 | static inline int _ldst_memtodev(unsigned dry_run, u8 buf[], | |
1286 | const struct _xfer_spec *pxs, int cyc) | |
1287 | { | |
1288 | int off = 0; | |
1289 | ||
1290 | while (cyc--) { | |
1291 | off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1292 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1293 | off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1294 | off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri); | |
1295 | } | |
1296 | ||
1297 | return off; | |
1298 | } | |
1299 | ||
1300 | static int _bursts(unsigned dry_run, u8 buf[], | |
1301 | const struct _xfer_spec *pxs, int cyc) | |
1302 | { | |
1303 | int off = 0; | |
1304 | ||
1305 | switch (pxs->r->rqtype) { | |
1306 | case MEMTODEV: | |
1307 | off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc); | |
1308 | break; | |
1309 | case DEVTOMEM: | |
1310 | off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc); | |
1311 | break; | |
1312 | case MEMTOMEM: | |
1313 | off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc); | |
1314 | break; | |
1315 | default: | |
1316 | off += 0x40000000; /* Scare off the Client */ | |
1317 | break; | |
1318 | } | |
1319 | ||
1320 | return off; | |
1321 | } | |
1322 | ||
1323 | /* Returns bytes consumed and updates bursts */ | |
1324 | static inline int _loop(unsigned dry_run, u8 buf[], | |
1325 | unsigned long *bursts, const struct _xfer_spec *pxs) | |
1326 | { | |
1327 | int cyc, cycmax, szlp, szlpend, szbrst, off; | |
1328 | unsigned lcnt0, lcnt1, ljmp0, ljmp1; | |
1329 | struct _arg_LPEND lpend; | |
1330 | ||
1331 | /* Max iterations possible in DMALP is 256 */ | |
1332 | if (*bursts >= 256*256) { | |
1333 | lcnt1 = 256; | |
1334 | lcnt0 = 256; | |
1335 | cyc = *bursts / lcnt1 / lcnt0; | |
1336 | } else if (*bursts > 256) { | |
1337 | lcnt1 = 256; | |
1338 | lcnt0 = *bursts / lcnt1; | |
1339 | cyc = 1; | |
1340 | } else { | |
1341 | lcnt1 = *bursts; | |
1342 | lcnt0 = 0; | |
1343 | cyc = 1; | |
1344 | } | |
1345 | ||
1346 | szlp = _emit_LP(1, buf, 0, 0); | |
1347 | szbrst = _bursts(1, buf, pxs, 1); | |
1348 | ||
1349 | lpend.cond = ALWAYS; | |
1350 | lpend.forever = false; | |
1351 | lpend.loop = 0; | |
1352 | lpend.bjump = 0; | |
1353 | szlpend = _emit_LPEND(1, buf, &lpend); | |
1354 | ||
1355 | if (lcnt0) { | |
1356 | szlp *= 2; | |
1357 | szlpend *= 2; | |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * Max bursts that we can unroll due to limit on the | |
1362 | * size of backward jump that can be encoded in DMALPEND | |
1363 | * which is 8-bits and hence 255 | |
1364 | */ | |
1365 | cycmax = (255 - (szlp + szlpend)) / szbrst; | |
1366 | ||
1367 | cyc = (cycmax < cyc) ? cycmax : cyc; | |
1368 | ||
1369 | off = 0; | |
1370 | ||
1371 | if (lcnt0) { | |
1372 | off += _emit_LP(dry_run, &buf[off], 0, lcnt0); | |
1373 | ljmp0 = off; | |
1374 | } | |
1375 | ||
1376 | off += _emit_LP(dry_run, &buf[off], 1, lcnt1); | |
1377 | ljmp1 = off; | |
1378 | ||
1379 | off += _bursts(dry_run, &buf[off], pxs, cyc); | |
1380 | ||
1381 | lpend.cond = ALWAYS; | |
1382 | lpend.forever = false; | |
1383 | lpend.loop = 1; | |
1384 | lpend.bjump = off - ljmp1; | |
1385 | off += _emit_LPEND(dry_run, &buf[off], &lpend); | |
1386 | ||
1387 | if (lcnt0) { | |
1388 | lpend.cond = ALWAYS; | |
1389 | lpend.forever = false; | |
1390 | lpend.loop = 0; | |
1391 | lpend.bjump = off - ljmp0; | |
1392 | off += _emit_LPEND(dry_run, &buf[off], &lpend); | |
1393 | } | |
1394 | ||
1395 | *bursts = lcnt1 * cyc; | |
1396 | if (lcnt0) | |
1397 | *bursts *= lcnt0; | |
1398 | ||
1399 | return off; | |
1400 | } | |
1401 | ||
1402 | static inline int _setup_loops(unsigned dry_run, u8 buf[], | |
1403 | const struct _xfer_spec *pxs) | |
1404 | { | |
1405 | struct pl330_xfer *x = pxs->x; | |
1406 | u32 ccr = pxs->ccr; | |
1407 | unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr); | |
1408 | int off = 0; | |
1409 | ||
1410 | while (bursts) { | |
1411 | c = bursts; | |
1412 | off += _loop(dry_run, &buf[off], &c, pxs); | |
1413 | bursts -= c; | |
1414 | } | |
1415 | ||
1416 | return off; | |
1417 | } | |
1418 | ||
1419 | static inline int _setup_xfer(unsigned dry_run, u8 buf[], | |
1420 | const struct _xfer_spec *pxs) | |
1421 | { | |
1422 | struct pl330_xfer *x = pxs->x; | |
1423 | int off = 0; | |
1424 | ||
1425 | /* DMAMOV SAR, x->src_addr */ | |
1426 | off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr); | |
1427 | /* DMAMOV DAR, x->dst_addr */ | |
1428 | off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr); | |
1429 | ||
1430 | /* Setup Loop(s) */ | |
1431 | off += _setup_loops(dry_run, &buf[off], pxs); | |
1432 | ||
1433 | return off; | |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * A req is a sequence of one or more xfer units. | |
1438 | * Returns the number of bytes taken to setup the MC for the req. | |
1439 | */ | |
1440 | static int _setup_req(unsigned dry_run, struct pl330_thread *thrd, | |
1441 | unsigned index, struct _xfer_spec *pxs) | |
1442 | { | |
1443 | struct _pl330_req *req = &thrd->req[index]; | |
1444 | struct pl330_xfer *x; | |
1445 | u8 *buf = req->mc_cpu; | |
1446 | int off = 0; | |
1447 | ||
1448 | PL330_DBGMC_START(req->mc_bus); | |
1449 | ||
1450 | /* DMAMOV CCR, ccr */ | |
1451 | off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr); | |
1452 | ||
1453 | x = pxs->r->x; | |
1454 | do { | |
1455 | /* Error if xfer length is not aligned at burst size */ | |
1456 | if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr))) | |
1457 | return -EINVAL; | |
1458 | ||
1459 | pxs->x = x; | |
1460 | off += _setup_xfer(dry_run, &buf[off], pxs); | |
1461 | ||
1462 | x = x->next; | |
1463 | } while (x); | |
1464 | ||
1465 | /* DMASEV peripheral/event */ | |
1466 | off += _emit_SEV(dry_run, &buf[off], thrd->ev); | |
1467 | /* DMAEND */ | |
1468 | off += _emit_END(dry_run, &buf[off]); | |
1469 | ||
1470 | return off; | |
1471 | } | |
1472 | ||
1473 | static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc) | |
1474 | { | |
1475 | u32 ccr = 0; | |
1476 | ||
1477 | if (rqc->src_inc) | |
1478 | ccr |= CC_SRCINC; | |
1479 | ||
1480 | if (rqc->dst_inc) | |
1481 | ccr |= CC_DSTINC; | |
1482 | ||
1483 | /* We set same protection levels for Src and DST for now */ | |
1484 | if (rqc->privileged) | |
1485 | ccr |= CC_SRCPRI | CC_DSTPRI; | |
1486 | if (rqc->nonsecure) | |
1487 | ccr |= CC_SRCNS | CC_DSTNS; | |
1488 | if (rqc->insnaccess) | |
1489 | ccr |= CC_SRCIA | CC_DSTIA; | |
1490 | ||
1491 | ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT); | |
1492 | ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT); | |
1493 | ||
1494 | ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT); | |
1495 | ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT); | |
1496 | ||
1497 | ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT); | |
1498 | ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT); | |
1499 | ||
1500 | ccr |= (rqc->swap << CC_SWAP_SHFT); | |
1501 | ||
1502 | return ccr; | |
1503 | } | |
1504 | ||
1505 | static inline bool _is_valid(u32 ccr) | |
1506 | { | |
1507 | enum pl330_dstcachectrl dcctl; | |
1508 | enum pl330_srccachectrl scctl; | |
1509 | ||
1510 | dcctl = (ccr >> CC_DSTCCTRL_SHFT) & CC_DRCCCTRL_MASK; | |
1511 | scctl = (ccr >> CC_SRCCCTRL_SHFT) & CC_SRCCCTRL_MASK; | |
1512 | ||
1513 | if (dcctl == DINVALID1 || dcctl == DINVALID2 | |
1514 | || scctl == SINVALID1 || scctl == SINVALID2) | |
1515 | return false; | |
1516 | else | |
1517 | return true; | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * Submit a list of xfers after which the client wants notification. | |
1522 | * Client is not notified after each xfer unit, just once after all | |
1523 | * xfer units are done or some error occurs. | |
1524 | */ | |
1525 | static int pl330_submit_req(void *ch_id, struct pl330_req *r) | |
1526 | { | |
1527 | struct pl330_thread *thrd = ch_id; | |
1528 | struct pl330_dmac *pl330; | |
1529 | struct pl330_info *pi; | |
1530 | struct _xfer_spec xs; | |
1531 | unsigned long flags; | |
1532 | void __iomem *regs; | |
1533 | unsigned idx; | |
1534 | u32 ccr; | |
1535 | int ret = 0; | |
1536 | ||
1537 | /* No Req or Unacquired Channel or DMAC */ | |
1538 | if (!r || !thrd || thrd->free) | |
1539 | return -EINVAL; | |
1540 | ||
1541 | pl330 = thrd->dmac; | |
1542 | pi = pl330->pinfo; | |
1543 | regs = pi->base; | |
1544 | ||
1545 | if (pl330->state == DYING | |
1546 | || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) { | |
1547 | dev_info(thrd->dmac->pinfo->dev, "%s:%d\n", | |
1548 | __func__, __LINE__); | |
1549 | return -EAGAIN; | |
1550 | } | |
1551 | ||
1552 | /* If request for non-existing peripheral */ | |
1553 | if (r->rqtype != MEMTOMEM && r->peri >= pi->pcfg.num_peri) { | |
1554 | dev_info(thrd->dmac->pinfo->dev, | |
1555 | "%s:%d Invalid peripheral(%u)!\n", | |
1556 | __func__, __LINE__, r->peri); | |
1557 | return -EINVAL; | |
1558 | } | |
1559 | ||
1560 | spin_lock_irqsave(&pl330->lock, flags); | |
1561 | ||
1562 | if (_queue_full(thrd)) { | |
1563 | ret = -EAGAIN; | |
1564 | goto xfer_exit; | |
1565 | } | |
1566 | ||
b7d861d9 BK |
1567 | |
1568 | /* Use last settings, if not provided */ | |
2e2c682b SK |
1569 | if (r->cfg) { |
1570 | /* Prefer Secure Channel */ | |
1571 | if (!_manager_ns(thrd)) | |
1572 | r->cfg->nonsecure = 0; | |
1573 | else | |
1574 | r->cfg->nonsecure = 1; | |
1575 | ||
b7d861d9 | 1576 | ccr = _prepare_ccr(r->cfg); |
2e2c682b | 1577 | } else { |
b7d861d9 | 1578 | ccr = readl(regs + CC(thrd->id)); |
2e2c682b | 1579 | } |
b7d861d9 BK |
1580 | |
1581 | /* If this req doesn't have valid xfer settings */ | |
1582 | if (!_is_valid(ccr)) { | |
1583 | ret = -EINVAL; | |
1584 | dev_info(thrd->dmac->pinfo->dev, "%s:%d Invalid CCR(%x)!\n", | |
1585 | __func__, __LINE__, ccr); | |
1586 | goto xfer_exit; | |
1587 | } | |
1588 | ||
1589 | idx = IS_FREE(&thrd->req[0]) ? 0 : 1; | |
1590 | ||
1591 | xs.ccr = ccr; | |
1592 | xs.r = r; | |
1593 | ||
1594 | /* First dry run to check if req is acceptable */ | |
1595 | ret = _setup_req(1, thrd, idx, &xs); | |
1596 | if (ret < 0) | |
1597 | goto xfer_exit; | |
1598 | ||
1599 | if (ret > pi->mcbufsz / 2) { | |
1600 | dev_info(thrd->dmac->pinfo->dev, | |
1601 | "%s:%d Trying increasing mcbufsz\n", | |
1602 | __func__, __LINE__); | |
1603 | ret = -ENOMEM; | |
1604 | goto xfer_exit; | |
1605 | } | |
1606 | ||
1607 | /* Hook the request */ | |
1608 | thrd->lstenq = idx; | |
1609 | thrd->req[idx].mc_len = _setup_req(0, thrd, idx, &xs); | |
1610 | thrd->req[idx].r = r; | |
1611 | ||
1612 | ret = 0; | |
1613 | ||
1614 | xfer_exit: | |
1615 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1616 | ||
1617 | return ret; | |
1618 | } | |
1619 | ||
1620 | static void pl330_dotask(unsigned long data) | |
1621 | { | |
1622 | struct pl330_dmac *pl330 = (struct pl330_dmac *) data; | |
1623 | struct pl330_info *pi = pl330->pinfo; | |
1624 | unsigned long flags; | |
1625 | int i; | |
1626 | ||
1627 | spin_lock_irqsave(&pl330->lock, flags); | |
1628 | ||
1629 | /* The DMAC itself gone nuts */ | |
1630 | if (pl330->dmac_tbd.reset_dmac) { | |
1631 | pl330->state = DYING; | |
1632 | /* Reset the manager too */ | |
1633 | pl330->dmac_tbd.reset_mngr = true; | |
1634 | /* Clear the reset flag */ | |
1635 | pl330->dmac_tbd.reset_dmac = false; | |
1636 | } | |
1637 | ||
1638 | if (pl330->dmac_tbd.reset_mngr) { | |
1639 | _stop(pl330->manager); | |
1640 | /* Reset all channels */ | |
1641 | pl330->dmac_tbd.reset_chan = (1 << pi->pcfg.num_chan) - 1; | |
1642 | /* Clear the reset flag */ | |
1643 | pl330->dmac_tbd.reset_mngr = false; | |
1644 | } | |
1645 | ||
1646 | for (i = 0; i < pi->pcfg.num_chan; i++) { | |
1647 | ||
1648 | if (pl330->dmac_tbd.reset_chan & (1 << i)) { | |
1649 | struct pl330_thread *thrd = &pl330->channels[i]; | |
1650 | void __iomem *regs = pi->base; | |
1651 | enum pl330_op_err err; | |
1652 | ||
1653 | _stop(thrd); | |
1654 | ||
1655 | if (readl(regs + FSC) & (1 << thrd->id)) | |
1656 | err = PL330_ERR_FAIL; | |
1657 | else | |
1658 | err = PL330_ERR_ABORT; | |
1659 | ||
1660 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1661 | ||
1662 | _callback(thrd->req[1 - thrd->lstenq].r, err); | |
1663 | _callback(thrd->req[thrd->lstenq].r, err); | |
1664 | ||
1665 | spin_lock_irqsave(&pl330->lock, flags); | |
1666 | ||
1667 | thrd->req[0].r = NULL; | |
1668 | thrd->req[1].r = NULL; | |
1669 | mark_free(thrd, 0); | |
1670 | mark_free(thrd, 1); | |
1671 | ||
1672 | /* Clear the reset flag */ | |
1673 | pl330->dmac_tbd.reset_chan &= ~(1 << i); | |
1674 | } | |
1675 | } | |
1676 | ||
1677 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1678 | ||
1679 | return; | |
1680 | } | |
1681 | ||
1682 | /* Returns 1 if state was updated, 0 otherwise */ | |
1683 | static int pl330_update(const struct pl330_info *pi) | |
1684 | { | |
fdec53d5 | 1685 | struct pl330_req *rqdone, *tmp; |
b7d861d9 BK |
1686 | struct pl330_dmac *pl330; |
1687 | unsigned long flags; | |
1688 | void __iomem *regs; | |
1689 | u32 val; | |
1690 | int id, ev, ret = 0; | |
1691 | ||
1692 | if (!pi || !pi->pl330_data) | |
1693 | return 0; | |
1694 | ||
1695 | regs = pi->base; | |
1696 | pl330 = pi->pl330_data; | |
1697 | ||
1698 | spin_lock_irqsave(&pl330->lock, flags); | |
1699 | ||
1700 | val = readl(regs + FSM) & 0x1; | |
1701 | if (val) | |
1702 | pl330->dmac_tbd.reset_mngr = true; | |
1703 | else | |
1704 | pl330->dmac_tbd.reset_mngr = false; | |
1705 | ||
1706 | val = readl(regs + FSC) & ((1 << pi->pcfg.num_chan) - 1); | |
1707 | pl330->dmac_tbd.reset_chan |= val; | |
1708 | if (val) { | |
1709 | int i = 0; | |
1710 | while (i < pi->pcfg.num_chan) { | |
1711 | if (val & (1 << i)) { | |
1712 | dev_info(pi->dev, | |
1713 | "Reset Channel-%d\t CS-%x FTC-%x\n", | |
1714 | i, readl(regs + CS(i)), | |
1715 | readl(regs + FTC(i))); | |
1716 | _stop(&pl330->channels[i]); | |
1717 | } | |
1718 | i++; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | /* Check which event happened i.e, thread notified */ | |
1723 | val = readl(regs + ES); | |
1724 | if (pi->pcfg.num_events < 32 | |
1725 | && val & ~((1 << pi->pcfg.num_events) - 1)) { | |
1726 | pl330->dmac_tbd.reset_dmac = true; | |
1727 | dev_err(pi->dev, "%s:%d Unexpected!\n", __func__, __LINE__); | |
1728 | ret = 1; | |
1729 | goto updt_exit; | |
1730 | } | |
1731 | ||
1732 | for (ev = 0; ev < pi->pcfg.num_events; ev++) { | |
1733 | if (val & (1 << ev)) { /* Event occurred */ | |
1734 | struct pl330_thread *thrd; | |
1735 | u32 inten = readl(regs + INTEN); | |
1736 | int active; | |
1737 | ||
1738 | /* Clear the event */ | |
1739 | if (inten & (1 << ev)) | |
1740 | writel(1 << ev, regs + INTCLR); | |
1741 | ||
1742 | ret = 1; | |
1743 | ||
1744 | id = pl330->events[ev]; | |
1745 | ||
1746 | thrd = &pl330->channels[id]; | |
1747 | ||
1748 | active = thrd->req_running; | |
1749 | if (active == -1) /* Aborted */ | |
1750 | continue; | |
1751 | ||
fdec53d5 JM |
1752 | /* Detach the req */ |
1753 | rqdone = thrd->req[active].r; | |
1754 | thrd->req[active].r = NULL; | |
1755 | ||
b7d861d9 BK |
1756 | mark_free(thrd, active); |
1757 | ||
1758 | /* Get going again ASAP */ | |
1759 | _start(thrd); | |
1760 | ||
1761 | /* For now, just make a list of callbacks to be done */ | |
1762 | list_add_tail(&rqdone->rqd, &pl330->req_done); | |
1763 | } | |
1764 | } | |
1765 | ||
1766 | /* Now that we are in no hurry, do the callbacks */ | |
fdec53d5 JM |
1767 | list_for_each_entry_safe(rqdone, tmp, &pl330->req_done, rqd) { |
1768 | list_del(&rqdone->rqd); | |
b7d861d9 BK |
1769 | |
1770 | spin_unlock_irqrestore(&pl330->lock, flags); | |
fdec53d5 | 1771 | _callback(rqdone, PL330_ERR_NONE); |
b7d861d9 BK |
1772 | spin_lock_irqsave(&pl330->lock, flags); |
1773 | } | |
1774 | ||
1775 | updt_exit: | |
1776 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1777 | ||
1778 | if (pl330->dmac_tbd.reset_dmac | |
1779 | || pl330->dmac_tbd.reset_mngr | |
1780 | || pl330->dmac_tbd.reset_chan) { | |
1781 | ret = 1; | |
1782 | tasklet_schedule(&pl330->tasks); | |
1783 | } | |
1784 | ||
1785 | return ret; | |
1786 | } | |
1787 | ||
1788 | static int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op) | |
1789 | { | |
1790 | struct pl330_thread *thrd = ch_id; | |
1791 | struct pl330_dmac *pl330; | |
1792 | unsigned long flags; | |
ef08e782 | 1793 | int ret = 0, active; |
b7d861d9 BK |
1794 | |
1795 | if (!thrd || thrd->free || thrd->dmac->state == DYING) | |
1796 | return -EINVAL; | |
1797 | ||
1798 | pl330 = thrd->dmac; | |
ef08e782 | 1799 | active = thrd->req_running; |
b7d861d9 BK |
1800 | |
1801 | spin_lock_irqsave(&pl330->lock, flags); | |
1802 | ||
1803 | switch (op) { | |
1804 | case PL330_OP_FLUSH: | |
1805 | /* Make sure the channel is stopped */ | |
1806 | _stop(thrd); | |
1807 | ||
1808 | thrd->req[0].r = NULL; | |
1809 | thrd->req[1].r = NULL; | |
1810 | mark_free(thrd, 0); | |
1811 | mark_free(thrd, 1); | |
1812 | break; | |
1813 | ||
1814 | case PL330_OP_ABORT: | |
1815 | /* Make sure the channel is stopped */ | |
1816 | _stop(thrd); | |
1817 | ||
1818 | /* ABORT is only for the active req */ | |
1819 | if (active == -1) | |
1820 | break; | |
1821 | ||
1822 | thrd->req[active].r = NULL; | |
1823 | mark_free(thrd, active); | |
1824 | ||
1825 | /* Start the next */ | |
1826 | case PL330_OP_START: | |
1827 | if ((active == -1) && !_start(thrd)) | |
1828 | ret = -EIO; | |
1829 | break; | |
1830 | ||
1831 | default: | |
1832 | ret = -EINVAL; | |
1833 | } | |
1834 | ||
1835 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1836 | return ret; | |
1837 | } | |
1838 | ||
b7d861d9 BK |
1839 | /* Reserve an event */ |
1840 | static inline int _alloc_event(struct pl330_thread *thrd) | |
1841 | { | |
1842 | struct pl330_dmac *pl330 = thrd->dmac; | |
1843 | struct pl330_info *pi = pl330->pinfo; | |
1844 | int ev; | |
1845 | ||
1846 | for (ev = 0; ev < pi->pcfg.num_events; ev++) | |
1847 | if (pl330->events[ev] == -1) { | |
1848 | pl330->events[ev] = thrd->id; | |
1849 | return ev; | |
1850 | } | |
1851 | ||
1852 | return -1; | |
1853 | } | |
1854 | ||
1855 | static bool _chan_ns(const struct pl330_info *pi, int i) | |
1856 | { | |
1857 | return pi->pcfg.irq_ns & (1 << i); | |
1858 | } | |
1859 | ||
1860 | /* Upon success, returns IdentityToken for the | |
1861 | * allocated channel, NULL otherwise. | |
1862 | */ | |
1863 | static void *pl330_request_channel(const struct pl330_info *pi) | |
1864 | { | |
1865 | struct pl330_thread *thrd = NULL; | |
1866 | struct pl330_dmac *pl330; | |
1867 | unsigned long flags; | |
1868 | int chans, i; | |
1869 | ||
1870 | if (!pi || !pi->pl330_data) | |
1871 | return NULL; | |
b3040e40 | 1872 | |
b7d861d9 BK |
1873 | pl330 = pi->pl330_data; |
1874 | ||
1875 | if (pl330->state == DYING) | |
1876 | return NULL; | |
1877 | ||
1878 | chans = pi->pcfg.num_chan; | |
1879 | ||
1880 | spin_lock_irqsave(&pl330->lock, flags); | |
1881 | ||
1882 | for (i = 0; i < chans; i++) { | |
1883 | thrd = &pl330->channels[i]; | |
1884 | if ((thrd->free) && (!_manager_ns(thrd) || | |
1885 | _chan_ns(pi, i))) { | |
1886 | thrd->ev = _alloc_event(thrd); | |
1887 | if (thrd->ev >= 0) { | |
1888 | thrd->free = false; | |
1889 | thrd->lstenq = 1; | |
1890 | thrd->req[0].r = NULL; | |
1891 | mark_free(thrd, 0); | |
1892 | thrd->req[1].r = NULL; | |
1893 | mark_free(thrd, 1); | |
1894 | break; | |
1895 | } | |
1896 | } | |
1897 | thrd = NULL; | |
1898 | } | |
1899 | ||
1900 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1901 | ||
1902 | return thrd; | |
1903 | } | |
1904 | ||
1905 | /* Release an event */ | |
1906 | static inline void _free_event(struct pl330_thread *thrd, int ev) | |
1907 | { | |
1908 | struct pl330_dmac *pl330 = thrd->dmac; | |
1909 | struct pl330_info *pi = pl330->pinfo; | |
1910 | ||
1911 | /* If the event is valid and was held by the thread */ | |
1912 | if (ev >= 0 && ev < pi->pcfg.num_events | |
1913 | && pl330->events[ev] == thrd->id) | |
1914 | pl330->events[ev] = -1; | |
1915 | } | |
1916 | ||
1917 | static void pl330_release_channel(void *ch_id) | |
1918 | { | |
1919 | struct pl330_thread *thrd = ch_id; | |
1920 | struct pl330_dmac *pl330; | |
1921 | unsigned long flags; | |
1922 | ||
1923 | if (!thrd || thrd->free) | |
1924 | return; | |
1925 | ||
1926 | _stop(thrd); | |
1927 | ||
1928 | _callback(thrd->req[1 - thrd->lstenq].r, PL330_ERR_ABORT); | |
1929 | _callback(thrd->req[thrd->lstenq].r, PL330_ERR_ABORT); | |
1930 | ||
1931 | pl330 = thrd->dmac; | |
1932 | ||
1933 | spin_lock_irqsave(&pl330->lock, flags); | |
1934 | _free_event(thrd, thrd->ev); | |
1935 | thrd->free = true; | |
1936 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1937 | } | |
1938 | ||
1939 | /* Initialize the structure for PL330 configuration, that can be used | |
1940 | * by the client driver the make best use of the DMAC | |
1941 | */ | |
1942 | static void read_dmac_config(struct pl330_info *pi) | |
1943 | { | |
1944 | void __iomem *regs = pi->base; | |
1945 | u32 val; | |
1946 | ||
1947 | val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT; | |
1948 | val &= CRD_DATA_WIDTH_MASK; | |
1949 | pi->pcfg.data_bus_width = 8 * (1 << val); | |
1950 | ||
1951 | val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT; | |
1952 | val &= CRD_DATA_BUFF_MASK; | |
1953 | pi->pcfg.data_buf_dep = val + 1; | |
1954 | ||
1955 | val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT; | |
1956 | val &= CR0_NUM_CHANS_MASK; | |
1957 | val += 1; | |
1958 | pi->pcfg.num_chan = val; | |
1959 | ||
1960 | val = readl(regs + CR0); | |
1961 | if (val & CR0_PERIPH_REQ_SET) { | |
1962 | val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK; | |
1963 | val += 1; | |
1964 | pi->pcfg.num_peri = val; | |
1965 | pi->pcfg.peri_ns = readl(regs + CR4); | |
1966 | } else { | |
1967 | pi->pcfg.num_peri = 0; | |
1968 | } | |
1969 | ||
1970 | val = readl(regs + CR0); | |
1971 | if (val & CR0_BOOT_MAN_NS) | |
1972 | pi->pcfg.mode |= DMAC_MODE_NS; | |
1973 | else | |
1974 | pi->pcfg.mode &= ~DMAC_MODE_NS; | |
1975 | ||
1976 | val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT; | |
1977 | val &= CR0_NUM_EVENTS_MASK; | |
1978 | val += 1; | |
1979 | pi->pcfg.num_events = val; | |
1980 | ||
1981 | pi->pcfg.irq_ns = readl(regs + CR3); | |
1982 | ||
1983 | pi->pcfg.periph_id = get_id(pi, PERIPH_ID); | |
1984 | pi->pcfg.pcell_id = get_id(pi, PCELL_ID); | |
1985 | } | |
1986 | ||
1987 | static inline void _reset_thread(struct pl330_thread *thrd) | |
1988 | { | |
1989 | struct pl330_dmac *pl330 = thrd->dmac; | |
1990 | struct pl330_info *pi = pl330->pinfo; | |
1991 | ||
1992 | thrd->req[0].mc_cpu = pl330->mcode_cpu | |
1993 | + (thrd->id * pi->mcbufsz); | |
1994 | thrd->req[0].mc_bus = pl330->mcode_bus | |
1995 | + (thrd->id * pi->mcbufsz); | |
1996 | thrd->req[0].r = NULL; | |
1997 | mark_free(thrd, 0); | |
1998 | ||
1999 | thrd->req[1].mc_cpu = thrd->req[0].mc_cpu | |
2000 | + pi->mcbufsz / 2; | |
2001 | thrd->req[1].mc_bus = thrd->req[0].mc_bus | |
2002 | + pi->mcbufsz / 2; | |
2003 | thrd->req[1].r = NULL; | |
2004 | mark_free(thrd, 1); | |
2005 | } | |
2006 | ||
2007 | static int dmac_alloc_threads(struct pl330_dmac *pl330) | |
2008 | { | |
2009 | struct pl330_info *pi = pl330->pinfo; | |
2010 | int chans = pi->pcfg.num_chan; | |
2011 | struct pl330_thread *thrd; | |
2012 | int i; | |
2013 | ||
2014 | /* Allocate 1 Manager and 'chans' Channel threads */ | |
2015 | pl330->channels = kzalloc((1 + chans) * sizeof(*thrd), | |
2016 | GFP_KERNEL); | |
2017 | if (!pl330->channels) | |
2018 | return -ENOMEM; | |
2019 | ||
2020 | /* Init Channel threads */ | |
2021 | for (i = 0; i < chans; i++) { | |
2022 | thrd = &pl330->channels[i]; | |
2023 | thrd->id = i; | |
2024 | thrd->dmac = pl330; | |
2025 | _reset_thread(thrd); | |
2026 | thrd->free = true; | |
2027 | } | |
2028 | ||
2029 | /* MANAGER is indexed at the end */ | |
2030 | thrd = &pl330->channels[chans]; | |
2031 | thrd->id = chans; | |
2032 | thrd->dmac = pl330; | |
2033 | thrd->free = false; | |
2034 | pl330->manager = thrd; | |
2035 | ||
2036 | return 0; | |
2037 | } | |
2038 | ||
2039 | static int dmac_alloc_resources(struct pl330_dmac *pl330) | |
2040 | { | |
2041 | struct pl330_info *pi = pl330->pinfo; | |
2042 | int chans = pi->pcfg.num_chan; | |
2043 | int ret; | |
b3040e40 | 2044 | |
b3040e40 | 2045 | /* |
b7d861d9 BK |
2046 | * Alloc MicroCode buffer for 'chans' Channel threads. |
2047 | * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN) | |
b3040e40 | 2048 | */ |
b7d861d9 BK |
2049 | pl330->mcode_cpu = dma_alloc_coherent(pi->dev, |
2050 | chans * pi->mcbufsz, | |
2051 | &pl330->mcode_bus, GFP_KERNEL); | |
2052 | if (!pl330->mcode_cpu) { | |
2053 | dev_err(pi->dev, "%s:%d Can't allocate memory!\n", | |
2054 | __func__, __LINE__); | |
2055 | return -ENOMEM; | |
2056 | } | |
2057 | ||
2058 | ret = dmac_alloc_threads(pl330); | |
2059 | if (ret) { | |
2060 | dev_err(pi->dev, "%s:%d Can't to create channels for DMAC!\n", | |
2061 | __func__, __LINE__); | |
2062 | dma_free_coherent(pi->dev, | |
2063 | chans * pi->mcbufsz, | |
2064 | pl330->mcode_cpu, pl330->mcode_bus); | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | return 0; | |
2069 | } | |
2070 | ||
2071 | static int pl330_add(struct pl330_info *pi) | |
2072 | { | |
2073 | struct pl330_dmac *pl330; | |
2074 | void __iomem *regs; | |
2075 | int i, ret; | |
2076 | ||
2077 | if (!pi || !pi->dev) | |
2078 | return -EINVAL; | |
2079 | ||
2080 | /* If already added */ | |
2081 | if (pi->pl330_data) | |
2082 | return -EINVAL; | |
2083 | ||
b3040e40 | 2084 | /* |
b7d861d9 BK |
2085 | * If the SoC can perform reset on the DMAC, then do it |
2086 | * before reading its configuration. | |
b3040e40 | 2087 | */ |
b7d861d9 BK |
2088 | if (pi->dmac_reset) |
2089 | pi->dmac_reset(pi); | |
b3040e40 | 2090 | |
b7d861d9 | 2091 | regs = pi->base; |
b3040e40 | 2092 | |
b7d861d9 BK |
2093 | /* Check if we can handle this DMAC */ |
2094 | if ((get_id(pi, PERIPH_ID) & 0xfffff) != PERIPH_ID_VAL | |
2095 | || get_id(pi, PCELL_ID) != PCELL_ID_VAL) { | |
2096 | dev_err(pi->dev, "PERIPH_ID 0x%x, PCELL_ID 0x%x !\n", | |
2097 | get_id(pi, PERIPH_ID), get_id(pi, PCELL_ID)); | |
2098 | return -EINVAL; | |
2099 | } | |
b3040e40 | 2100 | |
b7d861d9 BK |
2101 | /* Read the configuration of the DMAC */ |
2102 | read_dmac_config(pi); | |
b3040e40 | 2103 | |
b7d861d9 BK |
2104 | if (pi->pcfg.num_events == 0) { |
2105 | dev_err(pi->dev, "%s:%d Can't work without events!\n", | |
2106 | __func__, __LINE__); | |
2107 | return -EINVAL; | |
2108 | } | |
b3040e40 | 2109 | |
b7d861d9 BK |
2110 | pl330 = kzalloc(sizeof(*pl330), GFP_KERNEL); |
2111 | if (!pl330) { | |
2112 | dev_err(pi->dev, "%s:%d Can't allocate memory!\n", | |
2113 | __func__, __LINE__); | |
2114 | return -ENOMEM; | |
2115 | } | |
b3040e40 | 2116 | |
b7d861d9 BK |
2117 | /* Assign the info structure and private data */ |
2118 | pl330->pinfo = pi; | |
2119 | pi->pl330_data = pl330; | |
b3040e40 | 2120 | |
b7d861d9 | 2121 | spin_lock_init(&pl330->lock); |
1b9bb715 | 2122 | |
b7d861d9 | 2123 | INIT_LIST_HEAD(&pl330->req_done); |
42bc9cf4 | 2124 | |
b7d861d9 BK |
2125 | /* Use default MC buffer size if not provided */ |
2126 | if (!pi->mcbufsz) | |
2127 | pi->mcbufsz = MCODE_BUFF_PER_REQ * 2; | |
b3040e40 | 2128 | |
b7d861d9 BK |
2129 | /* Mark all events as free */ |
2130 | for (i = 0; i < pi->pcfg.num_events; i++) | |
2131 | pl330->events[i] = -1; | |
b3040e40 | 2132 | |
b7d861d9 BK |
2133 | /* Allocate resources needed by the DMAC */ |
2134 | ret = dmac_alloc_resources(pl330); | |
2135 | if (ret) { | |
2136 | dev_err(pi->dev, "Unable to create channels for DMAC\n"); | |
2137 | kfree(pl330); | |
2138 | return ret; | |
2139 | } | |
b3040e40 | 2140 | |
b7d861d9 | 2141 | tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330); |
b3040e40 | 2142 | |
b7d861d9 | 2143 | pl330->state = INIT; |
a2f5203f | 2144 | |
b7d861d9 BK |
2145 | return 0; |
2146 | } | |
b3040e40 | 2147 | |
b7d861d9 BK |
2148 | static int dmac_free_threads(struct pl330_dmac *pl330) |
2149 | { | |
2150 | struct pl330_info *pi = pl330->pinfo; | |
2151 | int chans = pi->pcfg.num_chan; | |
2152 | struct pl330_thread *thrd; | |
2153 | int i; | |
b3040e40 | 2154 | |
b7d861d9 BK |
2155 | /* Release Channel threads */ |
2156 | for (i = 0; i < chans; i++) { | |
2157 | thrd = &pl330->channels[i]; | |
2158 | pl330_release_channel((void *)thrd); | |
2159 | } | |
b3040e40 | 2160 | |
b7d861d9 BK |
2161 | /* Free memory */ |
2162 | kfree(pl330->channels); | |
b3040e40 | 2163 | |
b7d861d9 BK |
2164 | return 0; |
2165 | } | |
b3040e40 | 2166 | |
b7d861d9 BK |
2167 | static void dmac_free_resources(struct pl330_dmac *pl330) |
2168 | { | |
2169 | struct pl330_info *pi = pl330->pinfo; | |
2170 | int chans = pi->pcfg.num_chan; | |
b3040e40 | 2171 | |
b7d861d9 BK |
2172 | dmac_free_threads(pl330); |
2173 | ||
2174 | dma_free_coherent(pi->dev, chans * pi->mcbufsz, | |
2175 | pl330->mcode_cpu, pl330->mcode_bus); | |
2176 | } | |
2177 | ||
2178 | static void pl330_del(struct pl330_info *pi) | |
2179 | { | |
2180 | struct pl330_dmac *pl330; | |
2181 | ||
2182 | if (!pi || !pi->pl330_data) | |
2183 | return; | |
2184 | ||
2185 | pl330 = pi->pl330_data; | |
2186 | ||
2187 | pl330->state = UNINIT; | |
2188 | ||
2189 | tasklet_kill(&pl330->tasks); | |
2190 | ||
2191 | /* Free DMAC resources */ | |
2192 | dmac_free_resources(pl330); | |
2193 | ||
2194 | kfree(pl330); | |
2195 | pi->pl330_data = NULL; | |
2196 | } | |
b3040e40 | 2197 | |
3e2ec13a TA |
2198 | /* forward declaration */ |
2199 | static struct amba_driver pl330_driver; | |
2200 | ||
b3040e40 JB |
2201 | static inline struct dma_pl330_chan * |
2202 | to_pchan(struct dma_chan *ch) | |
2203 | { | |
2204 | if (!ch) | |
2205 | return NULL; | |
2206 | ||
2207 | return container_of(ch, struct dma_pl330_chan, chan); | |
2208 | } | |
2209 | ||
2210 | static inline struct dma_pl330_desc * | |
2211 | to_desc(struct dma_async_tx_descriptor *tx) | |
2212 | { | |
2213 | return container_of(tx, struct dma_pl330_desc, txd); | |
2214 | } | |
2215 | ||
2216 | static inline void free_desc_list(struct list_head *list) | |
2217 | { | |
2218 | struct dma_pl330_dmac *pdmac; | |
2219 | struct dma_pl330_desc *desc; | |
c8473828 | 2220 | struct dma_pl330_chan *pch = NULL; |
b3040e40 JB |
2221 | unsigned long flags; |
2222 | ||
b3040e40 JB |
2223 | /* Finish off the work list */ |
2224 | list_for_each_entry(desc, list, node) { | |
2225 | dma_async_tx_callback callback; | |
2226 | void *param; | |
2227 | ||
2228 | /* All desc in a list belong to same channel */ | |
2229 | pch = desc->pchan; | |
2230 | callback = desc->txd.callback; | |
2231 | param = desc->txd.callback_param; | |
2232 | ||
2233 | if (callback) | |
2234 | callback(param); | |
2235 | ||
2236 | desc->pchan = NULL; | |
2237 | } | |
2238 | ||
c8473828 OJ |
2239 | /* pch will be unset if list was empty */ |
2240 | if (!pch) | |
2241 | return; | |
2242 | ||
b3040e40 JB |
2243 | pdmac = pch->dmac; |
2244 | ||
2245 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2246 | list_splice_tail_init(list, &pdmac->desc_pool); | |
2247 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2248 | } | |
2249 | ||
42bc9cf4 BK |
2250 | static inline void handle_cyclic_desc_list(struct list_head *list) |
2251 | { | |
2252 | struct dma_pl330_desc *desc; | |
c8473828 | 2253 | struct dma_pl330_chan *pch = NULL; |
42bc9cf4 BK |
2254 | unsigned long flags; |
2255 | ||
42bc9cf4 BK |
2256 | list_for_each_entry(desc, list, node) { |
2257 | dma_async_tx_callback callback; | |
2258 | ||
2259 | /* Change status to reload it */ | |
2260 | desc->status = PREP; | |
2261 | pch = desc->pchan; | |
2262 | callback = desc->txd.callback; | |
2263 | if (callback) | |
2264 | callback(desc->txd.callback_param); | |
2265 | } | |
2266 | ||
c8473828 OJ |
2267 | /* pch will be unset if list was empty */ |
2268 | if (!pch) | |
2269 | return; | |
2270 | ||
42bc9cf4 BK |
2271 | spin_lock_irqsave(&pch->lock, flags); |
2272 | list_splice_tail_init(list, &pch->work_list); | |
2273 | spin_unlock_irqrestore(&pch->lock, flags); | |
2274 | } | |
2275 | ||
b3040e40 JB |
2276 | static inline void fill_queue(struct dma_pl330_chan *pch) |
2277 | { | |
2278 | struct dma_pl330_desc *desc; | |
2279 | int ret; | |
2280 | ||
2281 | list_for_each_entry(desc, &pch->work_list, node) { | |
2282 | ||
2283 | /* If already submitted */ | |
2284 | if (desc->status == BUSY) | |
2285 | break; | |
2286 | ||
2287 | ret = pl330_submit_req(pch->pl330_chid, | |
2288 | &desc->req); | |
2289 | if (!ret) { | |
2290 | desc->status = BUSY; | |
2291 | break; | |
2292 | } else if (ret == -EAGAIN) { | |
2293 | /* QFull or DMAC Dying */ | |
2294 | break; | |
2295 | } else { | |
2296 | /* Unacceptable request */ | |
2297 | desc->status = DONE; | |
2298 | dev_err(pch->dmac->pif.dev, "%s:%d Bad Desc(%d)\n", | |
2299 | __func__, __LINE__, desc->txd.cookie); | |
2300 | tasklet_schedule(&pch->task); | |
2301 | } | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | static void pl330_tasklet(unsigned long data) | |
2306 | { | |
2307 | struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data; | |
2308 | struct dma_pl330_desc *desc, *_dt; | |
2309 | unsigned long flags; | |
2310 | LIST_HEAD(list); | |
2311 | ||
2312 | spin_lock_irqsave(&pch->lock, flags); | |
2313 | ||
2314 | /* Pick up ripe tomatoes */ | |
2315 | list_for_each_entry_safe(desc, _dt, &pch->work_list, node) | |
2316 | if (desc->status == DONE) { | |
30c1dc0f | 2317 | if (!pch->cyclic) |
eab21585 | 2318 | dma_cookie_complete(&desc->txd); |
b3040e40 JB |
2319 | list_move_tail(&desc->node, &list); |
2320 | } | |
2321 | ||
2322 | /* Try to submit a req imm. next to the last completed cookie */ | |
2323 | fill_queue(pch); | |
2324 | ||
2325 | /* Make sure the PL330 Channel thread is active */ | |
2326 | pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START); | |
2327 | ||
2328 | spin_unlock_irqrestore(&pch->lock, flags); | |
2329 | ||
42bc9cf4 BK |
2330 | if (pch->cyclic) |
2331 | handle_cyclic_desc_list(&list); | |
2332 | else | |
2333 | free_desc_list(&list); | |
b3040e40 JB |
2334 | } |
2335 | ||
2336 | static void dma_pl330_rqcb(void *token, enum pl330_op_err err) | |
2337 | { | |
2338 | struct dma_pl330_desc *desc = token; | |
2339 | struct dma_pl330_chan *pch = desc->pchan; | |
2340 | unsigned long flags; | |
2341 | ||
2342 | /* If desc aborted */ | |
2343 | if (!pch) | |
2344 | return; | |
2345 | ||
2346 | spin_lock_irqsave(&pch->lock, flags); | |
2347 | ||
2348 | desc->status = DONE; | |
2349 | ||
2350 | spin_unlock_irqrestore(&pch->lock, flags); | |
2351 | ||
2352 | tasklet_schedule(&pch->task); | |
2353 | } | |
2354 | ||
3e2ec13a TA |
2355 | bool pl330_filter(struct dma_chan *chan, void *param) |
2356 | { | |
cd072515 | 2357 | u8 *peri_id; |
3e2ec13a TA |
2358 | |
2359 | if (chan->device->dev->driver != &pl330_driver.drv) | |
2360 | return false; | |
2361 | ||
93ed5544 TA |
2362 | #ifdef CONFIG_OF |
2363 | if (chan->device->dev->of_node) { | |
2364 | const __be32 *prop_value; | |
2365 | phandle phandle; | |
2366 | struct device_node *node; | |
2367 | ||
2368 | prop_value = ((struct property *)param)->value; | |
2369 | phandle = be32_to_cpup(prop_value++); | |
2370 | node = of_find_node_by_phandle(phandle); | |
2371 | return ((chan->private == node) && | |
2372 | (chan->chan_id == be32_to_cpup(prop_value))); | |
2373 | } | |
2374 | #endif | |
2375 | ||
cd072515 TA |
2376 | peri_id = chan->private; |
2377 | return *peri_id == (unsigned)param; | |
3e2ec13a TA |
2378 | } |
2379 | EXPORT_SYMBOL(pl330_filter); | |
2380 | ||
b3040e40 JB |
2381 | static int pl330_alloc_chan_resources(struct dma_chan *chan) |
2382 | { | |
2383 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2384 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
2385 | unsigned long flags; | |
2386 | ||
2387 | spin_lock_irqsave(&pch->lock, flags); | |
2388 | ||
d3ee98cd | 2389 | dma_cookie_init(chan); |
42bc9cf4 | 2390 | pch->cyclic = false; |
b3040e40 JB |
2391 | |
2392 | pch->pl330_chid = pl330_request_channel(&pdmac->pif); | |
2393 | if (!pch->pl330_chid) { | |
2394 | spin_unlock_irqrestore(&pch->lock, flags); | |
02747885 | 2395 | return -ENOMEM; |
b3040e40 JB |
2396 | } |
2397 | ||
2398 | tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch); | |
2399 | ||
2400 | spin_unlock_irqrestore(&pch->lock, flags); | |
2401 | ||
2402 | return 1; | |
2403 | } | |
2404 | ||
2405 | static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) | |
2406 | { | |
2407 | struct dma_pl330_chan *pch = to_pchan(chan); | |
ae43b886 | 2408 | struct dma_pl330_desc *desc, *_dt; |
b3040e40 | 2409 | unsigned long flags; |
1d0c1d60 BK |
2410 | struct dma_pl330_dmac *pdmac = pch->dmac; |
2411 | struct dma_slave_config *slave_config; | |
ae43b886 | 2412 | LIST_HEAD(list); |
b3040e40 | 2413 | |
1d0c1d60 BK |
2414 | switch (cmd) { |
2415 | case DMA_TERMINATE_ALL: | |
2416 | spin_lock_irqsave(&pch->lock, flags); | |
b3040e40 | 2417 | |
1d0c1d60 BK |
2418 | /* FLUSH the PL330 Channel thread */ |
2419 | pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH); | |
b3040e40 | 2420 | |
1d0c1d60 | 2421 | /* Mark all desc done */ |
ae43b886 | 2422 | list_for_each_entry_safe(desc, _dt, &pch->work_list , node) { |
1d0c1d60 | 2423 | desc->status = DONE; |
ae43b886 BK |
2424 | list_move_tail(&desc->node, &list); |
2425 | } | |
b3040e40 | 2426 | |
ae43b886 | 2427 | list_splice_tail_init(&list, &pdmac->desc_pool); |
1d0c1d60 | 2428 | spin_unlock_irqrestore(&pch->lock, flags); |
1d0c1d60 BK |
2429 | break; |
2430 | case DMA_SLAVE_CONFIG: | |
2431 | slave_config = (struct dma_slave_config *)arg; | |
2432 | ||
db8196df | 2433 | if (slave_config->direction == DMA_MEM_TO_DEV) { |
1d0c1d60 BK |
2434 | if (slave_config->dst_addr) |
2435 | pch->fifo_addr = slave_config->dst_addr; | |
2436 | if (slave_config->dst_addr_width) | |
2437 | pch->burst_sz = __ffs(slave_config->dst_addr_width); | |
2438 | if (slave_config->dst_maxburst) | |
2439 | pch->burst_len = slave_config->dst_maxburst; | |
db8196df | 2440 | } else if (slave_config->direction == DMA_DEV_TO_MEM) { |
1d0c1d60 BK |
2441 | if (slave_config->src_addr) |
2442 | pch->fifo_addr = slave_config->src_addr; | |
2443 | if (slave_config->src_addr_width) | |
2444 | pch->burst_sz = __ffs(slave_config->src_addr_width); | |
2445 | if (slave_config->src_maxburst) | |
2446 | pch->burst_len = slave_config->src_maxburst; | |
2447 | } | |
2448 | break; | |
2449 | default: | |
2450 | dev_err(pch->dmac->pif.dev, "Not supported command.\n"); | |
2451 | return -ENXIO; | |
2452 | } | |
b3040e40 JB |
2453 | |
2454 | return 0; | |
2455 | } | |
2456 | ||
2457 | static void pl330_free_chan_resources(struct dma_chan *chan) | |
2458 | { | |
2459 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2460 | unsigned long flags; | |
2461 | ||
2462 | spin_lock_irqsave(&pch->lock, flags); | |
2463 | ||
2464 | tasklet_kill(&pch->task); | |
2465 | ||
2466 | pl330_release_channel(pch->pl330_chid); | |
2467 | pch->pl330_chid = NULL; | |
2468 | ||
42bc9cf4 BK |
2469 | if (pch->cyclic) |
2470 | list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool); | |
2471 | ||
b3040e40 JB |
2472 | spin_unlock_irqrestore(&pch->lock, flags); |
2473 | } | |
2474 | ||
2475 | static enum dma_status | |
2476 | pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie, | |
2477 | struct dma_tx_state *txstate) | |
2478 | { | |
96a2af41 | 2479 | return dma_cookie_status(chan, cookie, txstate); |
b3040e40 JB |
2480 | } |
2481 | ||
2482 | static void pl330_issue_pending(struct dma_chan *chan) | |
2483 | { | |
2484 | pl330_tasklet((unsigned long) to_pchan(chan)); | |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * We returned the last one of the circular list of descriptor(s) | |
2489 | * from prep_xxx, so the argument to submit corresponds to the last | |
2490 | * descriptor of the list. | |
2491 | */ | |
2492 | static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx) | |
2493 | { | |
2494 | struct dma_pl330_desc *desc, *last = to_desc(tx); | |
2495 | struct dma_pl330_chan *pch = to_pchan(tx->chan); | |
2496 | dma_cookie_t cookie; | |
2497 | unsigned long flags; | |
2498 | ||
2499 | spin_lock_irqsave(&pch->lock, flags); | |
2500 | ||
2501 | /* Assign cookies to all nodes */ | |
b3040e40 JB |
2502 | while (!list_empty(&last->node)) { |
2503 | desc = list_entry(last->node.next, struct dma_pl330_desc, node); | |
2504 | ||
884485e1 | 2505 | dma_cookie_assign(&desc->txd); |
b3040e40 JB |
2506 | |
2507 | list_move_tail(&desc->node, &pch->work_list); | |
2508 | } | |
2509 | ||
884485e1 | 2510 | cookie = dma_cookie_assign(&last->txd); |
b3040e40 | 2511 | list_add_tail(&last->node, &pch->work_list); |
b3040e40 JB |
2512 | spin_unlock_irqrestore(&pch->lock, flags); |
2513 | ||
2514 | return cookie; | |
2515 | } | |
2516 | ||
2517 | static inline void _init_desc(struct dma_pl330_desc *desc) | |
2518 | { | |
2519 | desc->pchan = NULL; | |
2520 | desc->req.x = &desc->px; | |
2521 | desc->req.token = desc; | |
2522 | desc->rqcfg.swap = SWAP_NO; | |
2523 | desc->rqcfg.privileged = 0; | |
2524 | desc->rqcfg.insnaccess = 0; | |
2525 | desc->rqcfg.scctl = SCCTRL0; | |
2526 | desc->rqcfg.dcctl = DCCTRL0; | |
2527 | desc->req.cfg = &desc->rqcfg; | |
2528 | desc->req.xfer_cb = dma_pl330_rqcb; | |
2529 | desc->txd.tx_submit = pl330_tx_submit; | |
2530 | ||
2531 | INIT_LIST_HEAD(&desc->node); | |
2532 | } | |
2533 | ||
2534 | /* Returns the number of descriptors added to the DMAC pool */ | |
5a67ac57 | 2535 | static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count) |
b3040e40 JB |
2536 | { |
2537 | struct dma_pl330_desc *desc; | |
2538 | unsigned long flags; | |
2539 | int i; | |
2540 | ||
2541 | if (!pdmac) | |
2542 | return 0; | |
2543 | ||
2544 | desc = kmalloc(count * sizeof(*desc), flg); | |
2545 | if (!desc) | |
2546 | return 0; | |
2547 | ||
2548 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2549 | ||
2550 | for (i = 0; i < count; i++) { | |
2551 | _init_desc(&desc[i]); | |
2552 | list_add_tail(&desc[i].node, &pdmac->desc_pool); | |
2553 | } | |
2554 | ||
2555 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2556 | ||
2557 | return count; | |
2558 | } | |
2559 | ||
2560 | static struct dma_pl330_desc * | |
2561 | pluck_desc(struct dma_pl330_dmac *pdmac) | |
2562 | { | |
2563 | struct dma_pl330_desc *desc = NULL; | |
2564 | unsigned long flags; | |
2565 | ||
2566 | if (!pdmac) | |
2567 | return NULL; | |
2568 | ||
2569 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2570 | ||
2571 | if (!list_empty(&pdmac->desc_pool)) { | |
2572 | desc = list_entry(pdmac->desc_pool.next, | |
2573 | struct dma_pl330_desc, node); | |
2574 | ||
2575 | list_del_init(&desc->node); | |
2576 | ||
2577 | desc->status = PREP; | |
2578 | desc->txd.callback = NULL; | |
2579 | } | |
2580 | ||
2581 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2582 | ||
2583 | return desc; | |
2584 | } | |
2585 | ||
2586 | static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch) | |
2587 | { | |
2588 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
cd072515 | 2589 | u8 *peri_id = pch->chan.private; |
b3040e40 JB |
2590 | struct dma_pl330_desc *desc; |
2591 | ||
2592 | /* Pluck one desc from the pool of DMAC */ | |
2593 | desc = pluck_desc(pdmac); | |
2594 | ||
2595 | /* If the DMAC pool is empty, alloc new */ | |
2596 | if (!desc) { | |
2597 | if (!add_desc(pdmac, GFP_ATOMIC, 1)) | |
2598 | return NULL; | |
2599 | ||
2600 | /* Try again */ | |
2601 | desc = pluck_desc(pdmac); | |
2602 | if (!desc) { | |
2603 | dev_err(pch->dmac->pif.dev, | |
2604 | "%s:%d ALERT!\n", __func__, __LINE__); | |
2605 | return NULL; | |
2606 | } | |
2607 | } | |
2608 | ||
2609 | /* Initialize the descriptor */ | |
2610 | desc->pchan = pch; | |
2611 | desc->txd.cookie = 0; | |
2612 | async_tx_ack(&desc->txd); | |
2613 | ||
cd072515 | 2614 | desc->req.peri = peri_id ? pch->chan.chan_id : 0; |
3ecf51a4 | 2615 | desc->rqcfg.pcfg = &pch->dmac->pif.pcfg; |
b3040e40 JB |
2616 | |
2617 | dma_async_tx_descriptor_init(&desc->txd, &pch->chan); | |
2618 | ||
2619 | return desc; | |
2620 | } | |
2621 | ||
2622 | static inline void fill_px(struct pl330_xfer *px, | |
2623 | dma_addr_t dst, dma_addr_t src, size_t len) | |
2624 | { | |
2625 | px->next = NULL; | |
2626 | px->bytes = len; | |
2627 | px->dst_addr = dst; | |
2628 | px->src_addr = src; | |
2629 | } | |
2630 | ||
2631 | static struct dma_pl330_desc * | |
2632 | __pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst, | |
2633 | dma_addr_t src, size_t len) | |
2634 | { | |
2635 | struct dma_pl330_desc *desc = pl330_get_desc(pch); | |
2636 | ||
2637 | if (!desc) { | |
2638 | dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n", | |
2639 | __func__, __LINE__); | |
2640 | return NULL; | |
2641 | } | |
2642 | ||
2643 | /* | |
2644 | * Ideally we should lookout for reqs bigger than | |
2645 | * those that can be programmed with 256 bytes of | |
2646 | * MC buffer, but considering a req size is seldom | |
2647 | * going to be word-unaligned and more than 200MB, | |
2648 | * we take it easy. | |
2649 | * Also, should the limit is reached we'd rather | |
2650 | * have the platform increase MC buffer size than | |
2651 | * complicating this API driver. | |
2652 | */ | |
2653 | fill_px(&desc->px, dst, src, len); | |
2654 | ||
2655 | return desc; | |
2656 | } | |
2657 | ||
2658 | /* Call after fixing burst size */ | |
2659 | static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len) | |
2660 | { | |
2661 | struct dma_pl330_chan *pch = desc->pchan; | |
2662 | struct pl330_info *pi = &pch->dmac->pif; | |
2663 | int burst_len; | |
2664 | ||
2665 | burst_len = pi->pcfg.data_bus_width / 8; | |
2666 | burst_len *= pi->pcfg.data_buf_dep; | |
2667 | burst_len >>= desc->rqcfg.brst_size; | |
2668 | ||
2669 | /* src/dst_burst_len can't be more than 16 */ | |
2670 | if (burst_len > 16) | |
2671 | burst_len = 16; | |
2672 | ||
2673 | while (burst_len > 1) { | |
2674 | if (!(len % (burst_len << desc->rqcfg.brst_size))) | |
2675 | break; | |
2676 | burst_len--; | |
2677 | } | |
2678 | ||
2679 | return burst_len; | |
2680 | } | |
2681 | ||
42bc9cf4 BK |
2682 | static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic( |
2683 | struct dma_chan *chan, dma_addr_t dma_addr, size_t len, | |
185ecb5f | 2684 | size_t period_len, enum dma_transfer_direction direction, |
ec8b5e48 | 2685 | unsigned long flags, void *context) |
42bc9cf4 BK |
2686 | { |
2687 | struct dma_pl330_desc *desc; | |
2688 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2689 | dma_addr_t dst; | |
2690 | dma_addr_t src; | |
2691 | ||
2692 | desc = pl330_get_desc(pch); | |
2693 | if (!desc) { | |
2694 | dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n", | |
2695 | __func__, __LINE__); | |
2696 | return NULL; | |
2697 | } | |
2698 | ||
2699 | switch (direction) { | |
db8196df | 2700 | case DMA_MEM_TO_DEV: |
42bc9cf4 BK |
2701 | desc->rqcfg.src_inc = 1; |
2702 | desc->rqcfg.dst_inc = 0; | |
cd072515 | 2703 | desc->req.rqtype = MEMTODEV; |
42bc9cf4 BK |
2704 | src = dma_addr; |
2705 | dst = pch->fifo_addr; | |
2706 | break; | |
db8196df | 2707 | case DMA_DEV_TO_MEM: |
42bc9cf4 BK |
2708 | desc->rqcfg.src_inc = 0; |
2709 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2710 | desc->req.rqtype = DEVTOMEM; |
42bc9cf4 BK |
2711 | src = pch->fifo_addr; |
2712 | dst = dma_addr; | |
2713 | break; | |
2714 | default: | |
2715 | dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n", | |
2716 | __func__, __LINE__); | |
2717 | return NULL; | |
2718 | } | |
2719 | ||
2720 | desc->rqcfg.brst_size = pch->burst_sz; | |
2721 | desc->rqcfg.brst_len = 1; | |
2722 | ||
2723 | pch->cyclic = true; | |
2724 | ||
2725 | fill_px(&desc->px, dst, src, period_len); | |
2726 | ||
2727 | return &desc->txd; | |
2728 | } | |
2729 | ||
b3040e40 JB |
2730 | static struct dma_async_tx_descriptor * |
2731 | pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, | |
2732 | dma_addr_t src, size_t len, unsigned long flags) | |
2733 | { | |
2734 | struct dma_pl330_desc *desc; | |
2735 | struct dma_pl330_chan *pch = to_pchan(chan); | |
b3040e40 JB |
2736 | struct pl330_info *pi; |
2737 | int burst; | |
2738 | ||
4e0e6109 | 2739 | if (unlikely(!pch || !len)) |
b3040e40 JB |
2740 | return NULL; |
2741 | ||
b3040e40 JB |
2742 | pi = &pch->dmac->pif; |
2743 | ||
2744 | desc = __pl330_prep_dma_memcpy(pch, dst, src, len); | |
2745 | if (!desc) | |
2746 | return NULL; | |
2747 | ||
2748 | desc->rqcfg.src_inc = 1; | |
2749 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2750 | desc->req.rqtype = MEMTOMEM; |
b3040e40 JB |
2751 | |
2752 | /* Select max possible burst size */ | |
2753 | burst = pi->pcfg.data_bus_width / 8; | |
2754 | ||
2755 | while (burst > 1) { | |
2756 | if (!(len % burst)) | |
2757 | break; | |
2758 | burst /= 2; | |
2759 | } | |
2760 | ||
2761 | desc->rqcfg.brst_size = 0; | |
2762 | while (burst != (1 << desc->rqcfg.brst_size)) | |
2763 | desc->rqcfg.brst_size++; | |
2764 | ||
2765 | desc->rqcfg.brst_len = get_burst_len(desc, len); | |
2766 | ||
2767 | desc->txd.flags = flags; | |
2768 | ||
2769 | return &desc->txd; | |
2770 | } | |
2771 | ||
2772 | static struct dma_async_tx_descriptor * | |
2773 | pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 2774 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 2775 | unsigned long flg, void *context) |
b3040e40 JB |
2776 | { |
2777 | struct dma_pl330_desc *first, *desc = NULL; | |
2778 | struct dma_pl330_chan *pch = to_pchan(chan); | |
b3040e40 JB |
2779 | struct scatterlist *sg; |
2780 | unsigned long flags; | |
1b9bb715 | 2781 | int i; |
b3040e40 JB |
2782 | dma_addr_t addr; |
2783 | ||
cd072515 | 2784 | if (unlikely(!pch || !sgl || !sg_len)) |
b3040e40 JB |
2785 | return NULL; |
2786 | ||
1b9bb715 | 2787 | addr = pch->fifo_addr; |
b3040e40 JB |
2788 | |
2789 | first = NULL; | |
2790 | ||
2791 | for_each_sg(sgl, sg, sg_len, i) { | |
2792 | ||
2793 | desc = pl330_get_desc(pch); | |
2794 | if (!desc) { | |
2795 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
2796 | ||
2797 | dev_err(pch->dmac->pif.dev, | |
2798 | "%s:%d Unable to fetch desc\n", | |
2799 | __func__, __LINE__); | |
2800 | if (!first) | |
2801 | return NULL; | |
2802 | ||
2803 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2804 | ||
2805 | while (!list_empty(&first->node)) { | |
2806 | desc = list_entry(first->node.next, | |
2807 | struct dma_pl330_desc, node); | |
2808 | list_move_tail(&desc->node, &pdmac->desc_pool); | |
2809 | } | |
2810 | ||
2811 | list_move_tail(&first->node, &pdmac->desc_pool); | |
2812 | ||
2813 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2814 | ||
2815 | return NULL; | |
2816 | } | |
2817 | ||
2818 | if (!first) | |
2819 | first = desc; | |
2820 | else | |
2821 | list_add_tail(&desc->node, &first->node); | |
2822 | ||
db8196df | 2823 | if (direction == DMA_MEM_TO_DEV) { |
b3040e40 JB |
2824 | desc->rqcfg.src_inc = 1; |
2825 | desc->rqcfg.dst_inc = 0; | |
cd072515 | 2826 | desc->req.rqtype = MEMTODEV; |
b3040e40 JB |
2827 | fill_px(&desc->px, |
2828 | addr, sg_dma_address(sg), sg_dma_len(sg)); | |
2829 | } else { | |
2830 | desc->rqcfg.src_inc = 0; | |
2831 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2832 | desc->req.rqtype = DEVTOMEM; |
b3040e40 JB |
2833 | fill_px(&desc->px, |
2834 | sg_dma_address(sg), addr, sg_dma_len(sg)); | |
2835 | } | |
2836 | ||
1b9bb715 | 2837 | desc->rqcfg.brst_size = pch->burst_sz; |
b3040e40 JB |
2838 | desc->rqcfg.brst_len = 1; |
2839 | } | |
2840 | ||
2841 | /* Return the last desc in the chain */ | |
2842 | desc->txd.flags = flg; | |
2843 | return &desc->txd; | |
2844 | } | |
2845 | ||
2846 | static irqreturn_t pl330_irq_handler(int irq, void *data) | |
2847 | { | |
2848 | if (pl330_update(data)) | |
2849 | return IRQ_HANDLED; | |
2850 | else | |
2851 | return IRQ_NONE; | |
2852 | } | |
2853 | ||
2854 | static int __devinit | |
aa25afad | 2855 | pl330_probe(struct amba_device *adev, const struct amba_id *id) |
b3040e40 JB |
2856 | { |
2857 | struct dma_pl330_platdata *pdat; | |
2858 | struct dma_pl330_dmac *pdmac; | |
2859 | struct dma_pl330_chan *pch; | |
2860 | struct pl330_info *pi; | |
2861 | struct dma_device *pd; | |
2862 | struct resource *res; | |
2863 | int i, ret, irq; | |
4e0e6109 | 2864 | int num_chan; |
b3040e40 JB |
2865 | |
2866 | pdat = adev->dev.platform_data; | |
2867 | ||
b3040e40 | 2868 | /* Allocate a new DMAC and its Channels */ |
4e0e6109 | 2869 | pdmac = kzalloc(sizeof(*pdmac), GFP_KERNEL); |
b3040e40 JB |
2870 | if (!pdmac) { |
2871 | dev_err(&adev->dev, "unable to allocate mem\n"); | |
2872 | return -ENOMEM; | |
2873 | } | |
2874 | ||
2875 | pi = &pdmac->pif; | |
2876 | pi->dev = &adev->dev; | |
2877 | pi->pl330_data = NULL; | |
4e0e6109 | 2878 | pi->mcbufsz = pdat ? pdat->mcbuf_sz : 0; |
b3040e40 JB |
2879 | |
2880 | res = &adev->res; | |
2881 | request_mem_region(res->start, resource_size(res), "dma-pl330"); | |
2882 | ||
2883 | pi->base = ioremap(res->start, resource_size(res)); | |
2884 | if (!pi->base) { | |
2885 | ret = -ENXIO; | |
2886 | goto probe_err1; | |
2887 | } | |
2888 | ||
a2f5203f BK |
2889 | amba_set_drvdata(adev, pdmac); |
2890 | ||
b3040e40 JB |
2891 | irq = adev->irq[0]; |
2892 | ret = request_irq(irq, pl330_irq_handler, 0, | |
2893 | dev_name(&adev->dev), pi); | |
2894 | if (ret) | |
7c71b8eb | 2895 | goto probe_err2; |
b3040e40 JB |
2896 | |
2897 | ret = pl330_add(pi); | |
2898 | if (ret) | |
7c71b8eb | 2899 | goto probe_err3; |
b3040e40 JB |
2900 | |
2901 | INIT_LIST_HEAD(&pdmac->desc_pool); | |
2902 | spin_lock_init(&pdmac->pool_lock); | |
2903 | ||
2904 | /* Create a descriptor pool of default size */ | |
2905 | if (!add_desc(pdmac, GFP_KERNEL, NR_DEFAULT_DESC)) | |
2906 | dev_warn(&adev->dev, "unable to allocate desc\n"); | |
2907 | ||
2908 | pd = &pdmac->ddma; | |
2909 | INIT_LIST_HEAD(&pd->channels); | |
2910 | ||
2911 | /* Initialize channel parameters */ | |
c8473828 OJ |
2912 | if (pdat) |
2913 | num_chan = max_t(int, pdat->nr_valid_peri, pi->pcfg.num_chan); | |
2914 | else | |
2915 | num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan); | |
2916 | ||
4e0e6109 | 2917 | pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL); |
61c6e753 SK |
2918 | if (!pdmac->peripherals) { |
2919 | ret = -ENOMEM; | |
2920 | dev_err(&adev->dev, "unable to allocate pdmac->peripherals\n"); | |
b7e97d22 | 2921 | goto probe_err4; |
61c6e753 | 2922 | } |
b3040e40 | 2923 | |
4e0e6109 RH |
2924 | for (i = 0; i < num_chan; i++) { |
2925 | pch = &pdmac->peripherals[i]; | |
93ed5544 TA |
2926 | if (!adev->dev.of_node) |
2927 | pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; | |
2928 | else | |
2929 | pch->chan.private = adev->dev.of_node; | |
b3040e40 JB |
2930 | |
2931 | INIT_LIST_HEAD(&pch->work_list); | |
2932 | spin_lock_init(&pch->lock); | |
2933 | pch->pl330_chid = NULL; | |
b3040e40 | 2934 | pch->chan.device = pd; |
b3040e40 JB |
2935 | pch->dmac = pdmac; |
2936 | ||
2937 | /* Add the channel to the DMAC list */ | |
b3040e40 JB |
2938 | list_add_tail(&pch->chan.device_node, &pd->channels); |
2939 | } | |
2940 | ||
2941 | pd->dev = &adev->dev; | |
93ed5544 | 2942 | if (pdat) { |
cd072515 | 2943 | pd->cap_mask = pdat->cap_mask; |
93ed5544 | 2944 | } else { |
cd072515 | 2945 | dma_cap_set(DMA_MEMCPY, pd->cap_mask); |
93ed5544 TA |
2946 | if (pi->pcfg.num_peri) { |
2947 | dma_cap_set(DMA_SLAVE, pd->cap_mask); | |
2948 | dma_cap_set(DMA_CYCLIC, pd->cap_mask); | |
5557a419 | 2949 | dma_cap_set(DMA_PRIVATE, pd->cap_mask); |
93ed5544 TA |
2950 | } |
2951 | } | |
b3040e40 JB |
2952 | |
2953 | pd->device_alloc_chan_resources = pl330_alloc_chan_resources; | |
2954 | pd->device_free_chan_resources = pl330_free_chan_resources; | |
2955 | pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy; | |
42bc9cf4 | 2956 | pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic; |
b3040e40 JB |
2957 | pd->device_tx_status = pl330_tx_status; |
2958 | pd->device_prep_slave_sg = pl330_prep_slave_sg; | |
2959 | pd->device_control = pl330_control; | |
2960 | pd->device_issue_pending = pl330_issue_pending; | |
2961 | ||
2962 | ret = dma_async_device_register(pd); | |
2963 | if (ret) { | |
2964 | dev_err(&adev->dev, "unable to register DMAC\n"); | |
7c71b8eb | 2965 | goto probe_err4; |
b3040e40 JB |
2966 | } |
2967 | ||
b3040e40 JB |
2968 | dev_info(&adev->dev, |
2969 | "Loaded driver for PL330 DMAC-%d\n", adev->periphid); | |
2970 | dev_info(&adev->dev, | |
2971 | "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n", | |
2972 | pi->pcfg.data_buf_dep, | |
2973 | pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan, | |
2974 | pi->pcfg.num_peri, pi->pcfg.num_events); | |
2975 | ||
2976 | return 0; | |
2977 | ||
7bec78e0 | 2978 | probe_err4: |
7c71b8eb | 2979 | pl330_del(pi); |
7bec78e0 | 2980 | probe_err3: |
7c71b8eb | 2981 | free_irq(irq, pi); |
b3040e40 JB |
2982 | probe_err2: |
2983 | iounmap(pi->base); | |
2984 | probe_err1: | |
2985 | release_mem_region(res->start, resource_size(res)); | |
2986 | kfree(pdmac); | |
2987 | ||
2988 | return ret; | |
2989 | } | |
2990 | ||
2991 | static int __devexit pl330_remove(struct amba_device *adev) | |
2992 | { | |
2993 | struct dma_pl330_dmac *pdmac = amba_get_drvdata(adev); | |
2994 | struct dma_pl330_chan *pch, *_p; | |
2995 | struct pl330_info *pi; | |
2996 | struct resource *res; | |
2997 | int irq; | |
2998 | ||
2999 | if (!pdmac) | |
3000 | return 0; | |
3001 | ||
3002 | amba_set_drvdata(adev, NULL); | |
3003 | ||
3004 | /* Idle the DMAC */ | |
3005 | list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels, | |
3006 | chan.device_node) { | |
3007 | ||
3008 | /* Remove the channel */ | |
3009 | list_del(&pch->chan.device_node); | |
3010 | ||
3011 | /* Flush the channel */ | |
3012 | pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0); | |
3013 | pl330_free_chan_resources(&pch->chan); | |
3014 | } | |
3015 | ||
3016 | pi = &pdmac->pif; | |
3017 | ||
3018 | pl330_del(pi); | |
3019 | ||
3020 | irq = adev->irq[0]; | |
3021 | free_irq(irq, pi); | |
3022 | ||
3023 | iounmap(pi->base); | |
3024 | ||
3025 | res = &adev->res; | |
3026 | release_mem_region(res->start, resource_size(res)); | |
3027 | ||
3028 | kfree(pdmac); | |
3029 | ||
3030 | return 0; | |
3031 | } | |
3032 | ||
3033 | static struct amba_id pl330_ids[] = { | |
3034 | { | |
3035 | .id = 0x00041330, | |
3036 | .mask = 0x000fffff, | |
3037 | }, | |
3038 | { 0, 0 }, | |
3039 | }; | |
3040 | ||
e8fa516a DM |
3041 | MODULE_DEVICE_TABLE(amba, pl330_ids); |
3042 | ||
b3040e40 JB |
3043 | static struct amba_driver pl330_driver = { |
3044 | .drv = { | |
3045 | .owner = THIS_MODULE, | |
3046 | .name = "dma-pl330", | |
3047 | }, | |
3048 | .id_table = pl330_ids, | |
3049 | .probe = pl330_probe, | |
3050 | .remove = pl330_remove, | |
3051 | }; | |
3052 | ||
9e5ed094 | 3053 | module_amba_driver(pl330_driver); |
b3040e40 JB |
3054 | |
3055 | MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); | |
3056 | MODULE_DESCRIPTION("API Driver for PL330 DMAC"); | |
3057 | MODULE_LICENSE("GPL"); |