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Merge tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jwess...
[linux/fpc-iii.git] / drivers / crypto / omap-aes.c
blob42f95a4326b0717fb4b55626add069037ecca9e8
1 /*
2 * Cryptographic API.
3 *
4 * Support for OMAP AES HW acceleration.
5 *
6 * Copyright (c) 2010 Nokia Corporation
7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
8 * Copyright (c) 2011 Texas Instruments Incorporated
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 */
15
16 #define pr_fmt(fmt) "%20s: " fmt, __func__
17 #define prn(num) pr_debug(#num "=%d\n", num)
18 #define prx(num) pr_debug(#num "=%x\n", num)
19
20 #include <linux/err.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/errno.h>
24 #include <linux/kernel.h>
25 #include <linux/platform_device.h>
26 #include <linux/scatterlist.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/dmaengine.h>
29 #include <linux/omap-dma.h>
30 #include <linux/pm_runtime.h>
31 #include <linux/of.h>
32 #include <linux/of_device.h>
33 #include <linux/of_address.h>
34 #include <linux/io.h>
35 #include <linux/crypto.h>
36 #include <linux/interrupt.h>
37 #include <crypto/scatterwalk.h>
38 #include <crypto/aes.h>
39
40 #define DST_MAXBURST 4
41 #define DMA_MIN (DST_MAXBURST * sizeof(u32))
42
43 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
44
45 /* OMAP TRM gives bitfields as start:end, where start is the higher bit
46 number. For example 7:0 */
47 #define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
48 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
49
50 #define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
51 ((x ^ 0x01) * 0x04))
52 #define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
53
54 #define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
55 #define AES_REG_CTRL_CTR_WIDTH_MASK (3 << 7)
56 #define AES_REG_CTRL_CTR_WIDTH_32 (0 << 7)
57 #define AES_REG_CTRL_CTR_WIDTH_64 (1 << 7)
58 #define AES_REG_CTRL_CTR_WIDTH_96 (2 << 7)
59 #define AES_REG_CTRL_CTR_WIDTH_128 (3 << 7)
60 #define AES_REG_CTRL_CTR (1 << 6)
61 #define AES_REG_CTRL_CBC (1 << 5)
62 #define AES_REG_CTRL_KEY_SIZE (3 << 3)
63 #define AES_REG_CTRL_DIRECTION (1 << 2)
64 #define AES_REG_CTRL_INPUT_READY (1 << 1)
65 #define AES_REG_CTRL_OUTPUT_READY (1 << 0)
66
67 #define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
68
69 #define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
70
71 #define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
72 #define AES_REG_MASK_SIDLE (1 << 6)
73 #define AES_REG_MASK_START (1 << 5)
74 #define AES_REG_MASK_DMA_OUT_EN (1 << 3)
75 #define AES_REG_MASK_DMA_IN_EN (1 << 2)
76 #define AES_REG_MASK_SOFTRESET (1 << 1)
77 #define AES_REG_AUTOIDLE (1 << 0)
78
79 #define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
80
81 #define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
82 #define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
83 #define AES_REG_IRQ_DATA_IN BIT(1)
84 #define AES_REG_IRQ_DATA_OUT BIT(2)
85 #define DEFAULT_TIMEOUT (5*HZ)
86
87 #define FLAGS_MODE_MASK 0x000f
88 #define FLAGS_ENCRYPT BIT(0)
89 #define FLAGS_CBC BIT(1)
90 #define FLAGS_GIV BIT(2)
91 #define FLAGS_CTR BIT(3)
92
93 #define FLAGS_INIT BIT(4)
94 #define FLAGS_FAST BIT(5)
95 #define FLAGS_BUSY BIT(6)
96
97 #define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
98
99 struct omap_aes_ctx {
100 struct omap_aes_dev *dd;
101
102 int keylen;
103 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
104 unsigned long flags;
105 };
106
107 struct omap_aes_reqctx {
108 unsigned long mode;
109 };
110
111 #define OMAP_AES_QUEUE_LENGTH 1
112 #define OMAP_AES_CACHE_SIZE 0
113
114 struct omap_aes_algs_info {
115 struct crypto_alg *algs_list;
116 unsigned int size;
117 unsigned int registered;
118 };
119
120 struct omap_aes_pdata {
121 struct omap_aes_algs_info *algs_info;
122 unsigned int algs_info_size;
123
124 void (*trigger)(struct omap_aes_dev *dd, int length);
125
126 u32 key_ofs;
127 u32 iv_ofs;
128 u32 ctrl_ofs;
129 u32 data_ofs;
130 u32 rev_ofs;
131 u32 mask_ofs;
132 u32 irq_enable_ofs;
133 u32 irq_status_ofs;
134
135 u32 dma_enable_in;
136 u32 dma_enable_out;
137 u32 dma_start;
138
139 u32 major_mask;
140 u32 major_shift;
141 u32 minor_mask;
142 u32 minor_shift;
143 };
144
145 struct omap_aes_dev {
146 struct list_head list;
147 unsigned long phys_base;
148 void __iomem *io_base;
149 struct omap_aes_ctx *ctx;
150 struct device *dev;
151 unsigned long flags;
152 int err;
153
154 spinlock_t lock;
155 struct crypto_queue queue;
156
157 struct tasklet_struct done_task;
158 struct tasklet_struct queue_task;
159
160 struct ablkcipher_request *req;
161
162 /*
163 * total is used by PIO mode for book keeping so introduce
164 * variable total_save as need it to calc page_order
165 */
166 size_t total;
167 size_t total_save;
168
169 struct scatterlist *in_sg;
170 struct scatterlist *out_sg;
171
172 /* Buffers for copying for unaligned cases */
173 struct scatterlist in_sgl;
174 struct scatterlist out_sgl;
175 struct scatterlist *orig_out;
176 int sgs_copied;
177
178 struct scatter_walk in_walk;
179 struct scatter_walk out_walk;
180 int dma_in;
181 struct dma_chan *dma_lch_in;
182 int dma_out;
183 struct dma_chan *dma_lch_out;
184 int in_sg_len;
185 int out_sg_len;
186 int pio_only;
187 const struct omap_aes_pdata *pdata;
188 };
189
190 /* keep registered devices data here */
191 static LIST_HEAD(dev_list);
192 static DEFINE_SPINLOCK(list_lock);
193
194 #ifdef DEBUG
195 #define omap_aes_read(dd, offset) \
196 ({ \
197 int _read_ret; \
198 _read_ret = __raw_readl(dd->io_base + offset); \
199 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
200 offset, _read_ret); \
201 _read_ret; \
202 })
203 #else
204 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
205 {
206 return __raw_readl(dd->io_base + offset);
207 }
208 #endif
209
210 #ifdef DEBUG
211 #define omap_aes_write(dd, offset, value) \
212 do { \
213 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
214 offset, value); \
215 __raw_writel(value, dd->io_base + offset); \
216 } while (0)
217 #else
218 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
219 u32 value)
220 {
221 __raw_writel(value, dd->io_base + offset);
222 }
223 #endif
224
225 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
226 u32 value, u32 mask)
227 {
228 u32 val;
229
230 val = omap_aes_read(dd, offset);
231 val &= ~mask;
232 val |= value;
233 omap_aes_write(dd, offset, val);
234 }
235
236 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
237 u32 *value, int count)
238 {
239 for (; count--; value++, offset += 4)
240 omap_aes_write(dd, offset, *value);
241 }
242
243 static int omap_aes_hw_init(struct omap_aes_dev *dd)
244 {
245 if (!(dd->flags & FLAGS_INIT)) {
246 dd->flags |= FLAGS_INIT;
247 dd->err = 0;
248 }
249
250 return 0;
251 }
252
253 static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
254 {
255 unsigned int key32;
256 int i, err;
257 u32 val, mask = 0;
258
259 err = omap_aes_hw_init(dd);
260 if (err)
261 return err;
262
263 key32 = dd->ctx->keylen / sizeof(u32);
264
265 /* it seems a key should always be set even if it has not changed */
266 for (i = 0; i < key32; i++) {
267 omap_aes_write(dd, AES_REG_KEY(dd, i),
268 __le32_to_cpu(dd->ctx->key[i]));
269 }
270
271 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
272 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
273
274 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
275 if (dd->flags & FLAGS_CBC)
276 val |= AES_REG_CTRL_CBC;
277 if (dd->flags & FLAGS_CTR) {
278 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
279 mask = AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_MASK;
280 }
281 if (dd->flags & FLAGS_ENCRYPT)
282 val |= AES_REG_CTRL_DIRECTION;
283
284 mask |= AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION |
285 AES_REG_CTRL_KEY_SIZE;
286
287 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, mask);
288
289 return 0;
290 }
291
292 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
293 {
294 u32 mask, val;
295
296 val = dd->pdata->dma_start;
297
298 if (dd->dma_lch_out != NULL)
299 val |= dd->pdata->dma_enable_out;
300 if (dd->dma_lch_in != NULL)
301 val |= dd->pdata->dma_enable_in;
302
303 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
304 dd->pdata->dma_start;
305
306 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
307
308 }
309
310 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
311 {
312 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
313 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
314
315 omap_aes_dma_trigger_omap2(dd, length);
316 }
317
318 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
319 {
320 u32 mask;
321
322 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
323 dd->pdata->dma_start;
324
325 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
326 }
327
328 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
329 {
330 struct omap_aes_dev *dd = NULL, *tmp;
331
332 spin_lock_bh(&list_lock);
333 if (!ctx->dd) {
334 list_for_each_entry(tmp, &dev_list, list) {
335 /* FIXME: take fist available aes core */
336 dd = tmp;
337 break;
338 }
339 ctx->dd = dd;
340 } else {
341 /* already found before */
342 dd = ctx->dd;
343 }
344 spin_unlock_bh(&list_lock);
345
346 return dd;
347 }
348
349 static void omap_aes_dma_out_callback(void *data)
350 {
351 struct omap_aes_dev *dd = data;
352
353 /* dma_lch_out - completed */
354 tasklet_schedule(&dd->done_task);
355 }
356
357 static int omap_aes_dma_init(struct omap_aes_dev *dd)
358 {
359 int err = -ENOMEM;
360 dma_cap_mask_t mask;
361
362 dd->dma_lch_out = NULL;
363 dd->dma_lch_in = NULL;
364
365 dma_cap_zero(mask);
366 dma_cap_set(DMA_SLAVE, mask);
367
368 dd->dma_lch_in = dma_request_slave_channel_compat(mask,
369 omap_dma_filter_fn,
370 &dd->dma_in,
371 dd->dev, "rx");
372 if (!dd->dma_lch_in) {
373 dev_err(dd->dev, "Unable to request in DMA channel\n");
374 goto err_dma_in;
375 }
376
377 dd->dma_lch_out = dma_request_slave_channel_compat(mask,
378 omap_dma_filter_fn,
379 &dd->dma_out,
380 dd->dev, "tx");
381 if (!dd->dma_lch_out) {
382 dev_err(dd->dev, "Unable to request out DMA channel\n");
383 goto err_dma_out;
384 }
385
386 return 0;
387
388 err_dma_out:
389 dma_release_channel(dd->dma_lch_in);
390 err_dma_in:
391 if (err)
392 pr_err("error: %d\n", err);
393 return err;
394 }
395
396 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
397 {
398 dma_release_channel(dd->dma_lch_out);
399 dma_release_channel(dd->dma_lch_in);
400 }
401
402 static void sg_copy_buf(void *buf, struct scatterlist *sg,
403 unsigned int start, unsigned int nbytes, int out)
404 {
405 struct scatter_walk walk;
406
407 if (!nbytes)
408 return;
409
410 scatterwalk_start(&walk, sg);
411 scatterwalk_advance(&walk, start);
412 scatterwalk_copychunks(buf, &walk, nbytes, out);
413 scatterwalk_done(&walk, out, 0);
414 }
415
416 static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
417 struct scatterlist *in_sg, struct scatterlist *out_sg,
418 int in_sg_len, int out_sg_len)
419 {
420 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
421 struct omap_aes_dev *dd = ctx->dd;
422 struct dma_async_tx_descriptor *tx_in, *tx_out;
423 struct dma_slave_config cfg;
424 int ret;
425
426 if (dd->pio_only) {
427 scatterwalk_start(&dd->in_walk, dd->in_sg);
428 scatterwalk_start(&dd->out_walk, dd->out_sg);
429
430 /* Enable DATAIN interrupt and let it take
431 care of the rest */
432 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
433 return 0;
434 }
435
436 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
437
438 memset(&cfg, 0, sizeof(cfg));
439
440 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
441 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
442 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
443 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
444 cfg.src_maxburst = DST_MAXBURST;
445 cfg.dst_maxburst = DST_MAXBURST;
446
447 /* IN */
448 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
449 if (ret) {
450 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
451 ret);
452 return ret;
453 }
454
455 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
456 DMA_MEM_TO_DEV,
457 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
458 if (!tx_in) {
459 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
460 return -EINVAL;
461 }
462
463 /* No callback necessary */
464 tx_in->callback_param = dd;
465
466 /* OUT */
467 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
468 if (ret) {
469 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
470 ret);
471 return ret;
472 }
473
474 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
475 DMA_DEV_TO_MEM,
476 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
477 if (!tx_out) {
478 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
479 return -EINVAL;
480 }
481
482 tx_out->callback = omap_aes_dma_out_callback;
483 tx_out->callback_param = dd;
484
485 dmaengine_submit(tx_in);
486 dmaengine_submit(tx_out);
487
488 dma_async_issue_pending(dd->dma_lch_in);
489 dma_async_issue_pending(dd->dma_lch_out);
490
491 /* start DMA */
492 dd->pdata->trigger(dd, dd->total);
493
494 return 0;
495 }
496
497 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
498 {
499 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
500 crypto_ablkcipher_reqtfm(dd->req));
501 int err;
502
503 pr_debug("total: %d\n", dd->total);
504
505 if (!dd->pio_only) {
506 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
507 DMA_TO_DEVICE);
508 if (!err) {
509 dev_err(dd->dev, "dma_map_sg() error\n");
510 return -EINVAL;
511 }
512
513 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
514 DMA_FROM_DEVICE);
515 if (!err) {
516 dev_err(dd->dev, "dma_map_sg() error\n");
517 return -EINVAL;
518 }
519 }
520
521 err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
522 dd->out_sg_len);
523 if (err && !dd->pio_only) {
524 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
525 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
526 DMA_FROM_DEVICE);
527 }
528
529 return err;
530 }
531
532 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
533 {
534 struct ablkcipher_request *req = dd->req;
535
536 pr_debug("err: %d\n", err);
537
538 dd->flags &= ~FLAGS_BUSY;
539
540 req->base.complete(&req->base, err);
541 }
542
543 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
544 {
545 int err = 0;
546
547 pr_debug("total: %d\n", dd->total);
548
549 omap_aes_dma_stop(dd);
550
551 dmaengine_terminate_all(dd->dma_lch_in);
552 dmaengine_terminate_all(dd->dma_lch_out);
553
554 return err;
555 }
556
557 static int omap_aes_check_aligned(struct scatterlist *sg)
558 {
559 while (sg) {
560 if (!IS_ALIGNED(sg->offset, 4))
561 return -1;
562 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
563 return -1;
564 sg = sg_next(sg);
565 }
566 return 0;
567 }
568
569 static int omap_aes_copy_sgs(struct omap_aes_dev *dd)
570 {
571 void *buf_in, *buf_out;
572 int pages;
573
574 pages = get_order(dd->total);
575
576 buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
577 buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
578
579 if (!buf_in || !buf_out) {
580 pr_err("Couldn't allocated pages for unaligned cases.\n");
581 return -1;
582 }
583
584 dd->orig_out = dd->out_sg;
585
586 sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
587
588 sg_init_table(&dd->in_sgl, 1);
589 sg_set_buf(&dd->in_sgl, buf_in, dd->total);
590 dd->in_sg = &dd->in_sgl;
591
592 sg_init_table(&dd->out_sgl, 1);
593 sg_set_buf(&dd->out_sgl, buf_out, dd->total);
594 dd->out_sg = &dd->out_sgl;
595
596 return 0;
597 }
598
599 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
600 struct ablkcipher_request *req)
601 {
602 struct crypto_async_request *async_req, *backlog;
603 struct omap_aes_ctx *ctx;
604 struct omap_aes_reqctx *rctx;
605 unsigned long flags;
606 int err, ret = 0;
607
608 spin_lock_irqsave(&dd->lock, flags);
609 if (req)
610 ret = ablkcipher_enqueue_request(&dd->queue, req);
611 if (dd->flags & FLAGS_BUSY) {
612 spin_unlock_irqrestore(&dd->lock, flags);
613 return ret;
614 }
615 backlog = crypto_get_backlog(&dd->queue);
616 async_req = crypto_dequeue_request(&dd->queue);
617 if (async_req)
618 dd->flags |= FLAGS_BUSY;
619 spin_unlock_irqrestore(&dd->lock, flags);
620
621 if (!async_req)
622 return ret;
623
624 if (backlog)
625 backlog->complete(backlog, -EINPROGRESS);
626
627 req = ablkcipher_request_cast(async_req);
628
629 /* assign new request to device */
630 dd->req = req;
631 dd->total = req->nbytes;
632 dd->total_save = req->nbytes;
633 dd->in_sg = req->src;
634 dd->out_sg = req->dst;
635
636 if (omap_aes_check_aligned(dd->in_sg) ||
637 omap_aes_check_aligned(dd->out_sg)) {
638 if (omap_aes_copy_sgs(dd))
639 pr_err("Failed to copy SGs for unaligned cases\n");
640 dd->sgs_copied = 1;
641 } else {
642 dd->sgs_copied = 0;
643 }
644
645 dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
646 dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
647 BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
648
649 rctx = ablkcipher_request_ctx(req);
650 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
651 rctx->mode &= FLAGS_MODE_MASK;
652 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
653
654 dd->ctx = ctx;
655 ctx->dd = dd;
656
657 err = omap_aes_write_ctrl(dd);
658 if (!err)
659 err = omap_aes_crypt_dma_start(dd);
660 if (err) {
661 /* aes_task will not finish it, so do it here */
662 omap_aes_finish_req(dd, err);
663 tasklet_schedule(&dd->queue_task);
664 }
665
666 return ret; /* return ret, which is enqueue return value */
667 }
668
669 static void omap_aes_done_task(unsigned long data)
670 {
671 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
672 void *buf_in, *buf_out;
673 int pages;
674
675 pr_debug("enter done_task\n");
676
677 if (!dd->pio_only) {
678 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
679 DMA_FROM_DEVICE);
680 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
681 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
682 DMA_FROM_DEVICE);
683 omap_aes_crypt_dma_stop(dd);
684 }
685
686 if (dd->sgs_copied) {
687 buf_in = sg_virt(&dd->in_sgl);
688 buf_out = sg_virt(&dd->out_sgl);
689
690 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
691
692 pages = get_order(dd->total_save);
693 free_pages((unsigned long)buf_in, pages);
694 free_pages((unsigned long)buf_out, pages);
695 }
696
697 omap_aes_finish_req(dd, 0);
698 omap_aes_handle_queue(dd, NULL);
699
700 pr_debug("exit\n");
701 }
702
703 static void omap_aes_queue_task(unsigned long data)
704 {
705 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
706
707 omap_aes_handle_queue(dd, NULL);
708 }
709
710 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
711 {
712 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
713 crypto_ablkcipher_reqtfm(req));
714 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
715 struct omap_aes_dev *dd;
716
717 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
718 !!(mode & FLAGS_ENCRYPT),
719 !!(mode & FLAGS_CBC));
720
721 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
722 pr_err("request size is not exact amount of AES blocks\n");
723 return -EINVAL;
724 }
725
726 dd = omap_aes_find_dev(ctx);
727 if (!dd)
728 return -ENODEV;
729
730 rctx->mode = mode;
731
732 return omap_aes_handle_queue(dd, req);
733 }
734
735 /* ********************** ALG API ************************************ */
736
737 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
738 unsigned int keylen)
739 {
740 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
741
742 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
743 keylen != AES_KEYSIZE_256)
744 return -EINVAL;
745
746 pr_debug("enter, keylen: %d\n", keylen);
747
748 memcpy(ctx->key, key, keylen);
749 ctx->keylen = keylen;
750
751 return 0;
752 }
753
754 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
755 {
756 return omap_aes_crypt(req, FLAGS_ENCRYPT);
757 }
758
759 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
760 {
761 return omap_aes_crypt(req, 0);
762 }
763
764 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
765 {
766 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
767 }
768
769 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
770 {
771 return omap_aes_crypt(req, FLAGS_CBC);
772 }
773
774 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
775 {
776 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
777 }
778
779 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
780 {
781 return omap_aes_crypt(req, FLAGS_CTR);
782 }
783
784 static int omap_aes_cra_init(struct crypto_tfm *tfm)
785 {
786 struct omap_aes_dev *dd = NULL;
787 int err;
788
789 /* Find AES device, currently picks the first device */
790 spin_lock_bh(&list_lock);
791 list_for_each_entry(dd, &dev_list, list) {
792 break;
793 }
794 spin_unlock_bh(&list_lock);
795
796 err = pm_runtime_get_sync(dd->dev);
797 if (err < 0) {
798 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
799 __func__, err);
800 return err;
801 }
802
803 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
804
805 return 0;
806 }
807
808 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
809 {
810 struct omap_aes_dev *dd = NULL;
811
812 /* Find AES device, currently picks the first device */
813 spin_lock_bh(&list_lock);
814 list_for_each_entry(dd, &dev_list, list) {
815 break;
816 }
817 spin_unlock_bh(&list_lock);
818
819 pm_runtime_put_sync(dd->dev);
820 }
821
822 /* ********************** ALGS ************************************ */
823
824 static struct crypto_alg algs_ecb_cbc[] = {
825 {
826 .cra_name = "ecb(aes)",
827 .cra_driver_name = "ecb-aes-omap",
828 .cra_priority = 100,
829 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
830 CRYPTO_ALG_KERN_DRIVER_ONLY |
831 CRYPTO_ALG_ASYNC,
832 .cra_blocksize = AES_BLOCK_SIZE,
833 .cra_ctxsize = sizeof(struct omap_aes_ctx),
834 .cra_alignmask = 0,
835 .cra_type = &crypto_ablkcipher_type,
836 .cra_module = THIS_MODULE,
837 .cra_init = omap_aes_cra_init,
838 .cra_exit = omap_aes_cra_exit,
839 .cra_u.ablkcipher = {
840 .min_keysize = AES_MIN_KEY_SIZE,
841 .max_keysize = AES_MAX_KEY_SIZE,
842 .setkey = omap_aes_setkey,
843 .encrypt = omap_aes_ecb_encrypt,
844 .decrypt = omap_aes_ecb_decrypt,
845 }
846 },
847 {
848 .cra_name = "cbc(aes)",
849 .cra_driver_name = "cbc-aes-omap",
850 .cra_priority = 100,
851 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
852 CRYPTO_ALG_KERN_DRIVER_ONLY |
853 CRYPTO_ALG_ASYNC,
854 .cra_blocksize = AES_BLOCK_SIZE,
855 .cra_ctxsize = sizeof(struct omap_aes_ctx),
856 .cra_alignmask = 0,
857 .cra_type = &crypto_ablkcipher_type,
858 .cra_module = THIS_MODULE,
859 .cra_init = omap_aes_cra_init,
860 .cra_exit = omap_aes_cra_exit,
861 .cra_u.ablkcipher = {
862 .min_keysize = AES_MIN_KEY_SIZE,
863 .max_keysize = AES_MAX_KEY_SIZE,
864 .ivsize = AES_BLOCK_SIZE,
865 .setkey = omap_aes_setkey,
866 .encrypt = omap_aes_cbc_encrypt,
867 .decrypt = omap_aes_cbc_decrypt,
868 }
869 }
870 };
871
872 static struct crypto_alg algs_ctr[] = {
873 {
874 .cra_name = "ctr(aes)",
875 .cra_driver_name = "ctr-aes-omap",
876 .cra_priority = 100,
877 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
878 CRYPTO_ALG_KERN_DRIVER_ONLY |
879 CRYPTO_ALG_ASYNC,
880 .cra_blocksize = AES_BLOCK_SIZE,
881 .cra_ctxsize = sizeof(struct omap_aes_ctx),
882 .cra_alignmask = 0,
883 .cra_type = &crypto_ablkcipher_type,
884 .cra_module = THIS_MODULE,
885 .cra_init = omap_aes_cra_init,
886 .cra_exit = omap_aes_cra_exit,
887 .cra_u.ablkcipher = {
888 .min_keysize = AES_MIN_KEY_SIZE,
889 .max_keysize = AES_MAX_KEY_SIZE,
890 .geniv = "eseqiv",
891 .ivsize = AES_BLOCK_SIZE,
892 .setkey = omap_aes_setkey,
893 .encrypt = omap_aes_ctr_encrypt,
894 .decrypt = omap_aes_ctr_decrypt,
895 }
896 } ,
897 };
898
899 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
900 {
901 .algs_list = algs_ecb_cbc,
902 .size = ARRAY_SIZE(algs_ecb_cbc),
903 },
904 };
905
906 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
907 .algs_info = omap_aes_algs_info_ecb_cbc,
908 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
909 .trigger = omap_aes_dma_trigger_omap2,
910 .key_ofs = 0x1c,
911 .iv_ofs = 0x20,
912 .ctrl_ofs = 0x30,
913 .data_ofs = 0x34,
914 .rev_ofs = 0x44,
915 .mask_ofs = 0x48,
916 .dma_enable_in = BIT(2),
917 .dma_enable_out = BIT(3),
918 .dma_start = BIT(5),
919 .major_mask = 0xf0,
920 .major_shift = 4,
921 .minor_mask = 0x0f,
922 .minor_shift = 0,
923 };
924
925 #ifdef CONFIG_OF
926 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
927 {
928 .algs_list = algs_ecb_cbc,
929 .size = ARRAY_SIZE(algs_ecb_cbc),
930 },
931 {
932 .algs_list = algs_ctr,
933 .size = ARRAY_SIZE(algs_ctr),
934 },
935 };
936
937 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
938 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
939 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
940 .trigger = omap_aes_dma_trigger_omap2,
941 .key_ofs = 0x1c,
942 .iv_ofs = 0x20,
943 .ctrl_ofs = 0x30,
944 .data_ofs = 0x34,
945 .rev_ofs = 0x44,
946 .mask_ofs = 0x48,
947 .dma_enable_in = BIT(2),
948 .dma_enable_out = BIT(3),
949 .dma_start = BIT(5),
950 .major_mask = 0xf0,
951 .major_shift = 4,
952 .minor_mask = 0x0f,
953 .minor_shift = 0,
954 };
955
956 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
957 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
958 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
959 .trigger = omap_aes_dma_trigger_omap4,
960 .key_ofs = 0x3c,
961 .iv_ofs = 0x40,
962 .ctrl_ofs = 0x50,
963 .data_ofs = 0x60,
964 .rev_ofs = 0x80,
965 .mask_ofs = 0x84,
966 .irq_status_ofs = 0x8c,
967 .irq_enable_ofs = 0x90,
968 .dma_enable_in = BIT(5),
969 .dma_enable_out = BIT(6),
970 .major_mask = 0x0700,
971 .major_shift = 8,
972 .minor_mask = 0x003f,
973 .minor_shift = 0,
974 };
975
976 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
977 {
978 struct omap_aes_dev *dd = dev_id;
979 u32 status, i;
980 u32 *src, *dst;
981
982 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
983 if (status & AES_REG_IRQ_DATA_IN) {
984 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
985
986 BUG_ON(!dd->in_sg);
987
988 BUG_ON(_calc_walked(in) > dd->in_sg->length);
989
990 src = sg_virt(dd->in_sg) + _calc_walked(in);
991
992 for (i = 0; i < AES_BLOCK_WORDS; i++) {
993 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
994
995 scatterwalk_advance(&dd->in_walk, 4);
996 if (dd->in_sg->length == _calc_walked(in)) {
997 dd->in_sg = sg_next(dd->in_sg);
998 if (dd->in_sg) {
999 scatterwalk_start(&dd->in_walk,
1000 dd->in_sg);
1001 src = sg_virt(dd->in_sg) +
1002 _calc_walked(in);
1003 }
1004 } else {
1005 src++;
1006 }
1007 }
1008
1009 /* Clear IRQ status */
1010 status &= ~AES_REG_IRQ_DATA_IN;
1011 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
1012
1013 /* Enable DATA_OUT interrupt */
1014 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
1015
1016 } else if (status & AES_REG_IRQ_DATA_OUT) {
1017 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
1018
1019 BUG_ON(!dd->out_sg);
1020
1021 BUG_ON(_calc_walked(out) > dd->out_sg->length);
1022
1023 dst = sg_virt(dd->out_sg) + _calc_walked(out);
1024
1025 for (i = 0; i < AES_BLOCK_WORDS; i++) {
1026 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
1027 scatterwalk_advance(&dd->out_walk, 4);
1028 if (dd->out_sg->length == _calc_walked(out)) {
1029 dd->out_sg = sg_next(dd->out_sg);
1030 if (dd->out_sg) {
1031 scatterwalk_start(&dd->out_walk,
1032 dd->out_sg);
1033 dst = sg_virt(dd->out_sg) +
1034 _calc_walked(out);
1035 }
1036 } else {
1037 dst++;
1038 }
1039 }
1040
1041 dd->total -= AES_BLOCK_SIZE;
1042
1043 BUG_ON(dd->total < 0);
1044
1045 /* Clear IRQ status */
1046 status &= ~AES_REG_IRQ_DATA_OUT;
1047 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
1048
1049 if (!dd->total)
1050 /* All bytes read! */
1051 tasklet_schedule(&dd->done_task);
1052 else
1053 /* Enable DATA_IN interrupt for next block */
1054 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
1055 }
1056
1057 return IRQ_HANDLED;
1058 }
1059
1060 static const struct of_device_id omap_aes_of_match[] = {
1061 {
1062 .compatible = "ti,omap2-aes",
1063 .data = &omap_aes_pdata_omap2,
1064 },
1065 {
1066 .compatible = "ti,omap3-aes",
1067 .data = &omap_aes_pdata_omap3,
1068 },
1069 {
1070 .compatible = "ti,omap4-aes",
1071 .data = &omap_aes_pdata_omap4,
1072 },
1073 {},
1074 };
1075 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
1076
1077 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1078 struct device *dev, struct resource *res)
1079 {
1080 struct device_node *node = dev->of_node;
1081 const struct of_device_id *match;
1082 int err = 0;
1083
1084 match = of_match_device(of_match_ptr(omap_aes_of_match), dev);
1085 if (!match) {
1086 dev_err(dev, "no compatible OF match\n");
1087 err = -EINVAL;
1088 goto err;
1089 }
1090
1091 err = of_address_to_resource(node, 0, res);
1092 if (err < 0) {
1093 dev_err(dev, "can't translate OF node address\n");
1094 err = -EINVAL;
1095 goto err;
1096 }
1097
1098 dd->dma_out = -1; /* Dummy value that's unused */
1099 dd->dma_in = -1; /* Dummy value that's unused */
1100
1101 dd->pdata = match->data;
1102
1103 err:
1104 return err;
1105 }
1106 #else
1107 static const struct of_device_id omap_aes_of_match[] = {
1108 {},
1109 };
1110
1111 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1112 struct device *dev, struct resource *res)
1113 {
1114 return -EINVAL;
1115 }
1116 #endif
1117
1118 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1119 struct platform_device *pdev, struct resource *res)
1120 {
1121 struct device *dev = &pdev->dev;
1122 struct resource *r;
1123 int err = 0;
1124
1125 /* Get the base address */
1126 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1127 if (!r) {
1128 dev_err(dev, "no MEM resource info\n");
1129 err = -ENODEV;
1130 goto err;
1131 }
1132 memcpy(res, r, sizeof(*res));
1133
1134 /* Get the DMA out channel */
1135 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1136 if (!r) {
1137 dev_err(dev, "no DMA out resource info\n");
1138 err = -ENODEV;
1139 goto err;
1140 }
1141 dd->dma_out = r->start;
1142
1143 /* Get the DMA in channel */
1144 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1145 if (!r) {
1146 dev_err(dev, "no DMA in resource info\n");
1147 err = -ENODEV;
1148 goto err;
1149 }
1150 dd->dma_in = r->start;
1151
1152 /* Only OMAP2/3 can be non-DT */
1153 dd->pdata = &omap_aes_pdata_omap2;
1154
1155 err:
1156 return err;
1157 }
1158
1159 static int omap_aes_probe(struct platform_device *pdev)
1160 {
1161 struct device *dev = &pdev->dev;
1162 struct omap_aes_dev *dd;
1163 struct crypto_alg *algp;
1164 struct resource res;
1165 int err = -ENOMEM, i, j, irq = -1;
1166 u32 reg;
1167
1168 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1169 if (dd == NULL) {
1170 dev_err(dev, "unable to alloc data struct.\n");
1171 goto err_data;
1172 }
1173 dd->dev = dev;
1174 platform_set_drvdata(pdev, dd);
1175
1176 spin_lock_init(&dd->lock);
1177 crypto_init_queue(&dd->queue, OMAP_AES_QUEUE_LENGTH);
1178
1179 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1180 omap_aes_get_res_pdev(dd, pdev, &res);
1181 if (err)
1182 goto err_res;
1183
1184 dd->io_base = devm_ioremap_resource(dev, &res);
1185 if (IS_ERR(dd->io_base)) {
1186 err = PTR_ERR(dd->io_base);
1187 goto err_res;
1188 }
1189 dd->phys_base = res.start;
1190
1191 pm_runtime_enable(dev);
1192 err = pm_runtime_get_sync(dev);
1193 if (err < 0) {
1194 dev_err(dev, "%s: failed to get_sync(%d)\n",
1195 __func__, err);
1196 goto err_res;
1197 }
1198
1199 omap_aes_dma_stop(dd);
1200
1201 reg = omap_aes_read(dd, AES_REG_REV(dd));
1202
1203 pm_runtime_put_sync(dev);
1204
1205 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1206 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1207 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1208
1209 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1210 tasklet_init(&dd->queue_task, omap_aes_queue_task, (unsigned long)dd);
1211
1212 err = omap_aes_dma_init(dd);
1213 if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1214 dd->pio_only = 1;
1215
1216 irq = platform_get_irq(pdev, 0);
1217 if (irq < 0) {
1218 dev_err(dev, "can't get IRQ resource\n");
1219 goto err_irq;
1220 }
1221
1222 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1223 dev_name(dev), dd);
1224 if (err) {
1225 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1226 goto err_irq;
1227 }
1228 }
1229
1230
1231 INIT_LIST_HEAD(&dd->list);
1232 spin_lock(&list_lock);
1233 list_add_tail(&dd->list, &dev_list);
1234 spin_unlock(&list_lock);
1235
1236 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1237 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1238 algp = &dd->pdata->algs_info[i].algs_list[j];
1239
1240 pr_debug("reg alg: %s\n", algp->cra_name);
1241 INIT_LIST_HEAD(&algp->cra_list);
1242
1243 err = crypto_register_alg(algp);
1244 if (err)
1245 goto err_algs;
1246
1247 dd->pdata->algs_info[i].registered++;
1248 }
1249 }
1250
1251 return 0;
1252 err_algs:
1253 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1254 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1255 crypto_unregister_alg(
1256 &dd->pdata->algs_info[i].algs_list[j]);
1257 if (!dd->pio_only)
1258 omap_aes_dma_cleanup(dd);
1259 err_irq:
1260 tasklet_kill(&dd->done_task);
1261 tasklet_kill(&dd->queue_task);
1262 pm_runtime_disable(dev);
1263 err_res:
1264 dd = NULL;
1265 err_data:
1266 dev_err(dev, "initialization failed.\n");
1267 return err;
1268 }
1269
1270 static int omap_aes_remove(struct platform_device *pdev)
1271 {
1272 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1273 int i, j;
1274
1275 if (!dd)
1276 return -ENODEV;
1277
1278 spin_lock(&list_lock);
1279 list_del(&dd->list);
1280 spin_unlock(&list_lock);
1281
1282 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1283 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1284 crypto_unregister_alg(
1285 &dd->pdata->algs_info[i].algs_list[j]);
1286
1287 tasklet_kill(&dd->done_task);
1288 tasklet_kill(&dd->queue_task);
1289 omap_aes_dma_cleanup(dd);
1290 pm_runtime_disable(dd->dev);
1291 dd = NULL;
1292
1293 return 0;
1294 }
1295
1296 #ifdef CONFIG_PM_SLEEP
1297 static int omap_aes_suspend(struct device *dev)
1298 {
1299 pm_runtime_put_sync(dev);
1300 return 0;
1301 }
1302
1303 static int omap_aes_resume(struct device *dev)
1304 {
1305 pm_runtime_get_sync(dev);
1306 return 0;
1307 }
1308 #endif
1309
1310 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1311
1312 static struct platform_driver omap_aes_driver = {
1313 .probe = omap_aes_probe,
1314 .remove = omap_aes_remove,
1315 .driver = {
1316 .name = "omap-aes",
1317 .pm = &omap_aes_pm_ops,
1318 .of_match_table = omap_aes_of_match,
1319 },
1320 };
1321
1322 module_platform_driver(omap_aes_driver);
1323
1324 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1325 MODULE_LICENSE("GPL v2");
1326 MODULE_AUTHOR("Dmitry Kasatkin");
1327
Linux with added FPC-III support