2 * Support for Marvell's Cryptographic Engine and Security Accelerator (CESA)
3 * that can be found on the following platform: Orion, Kirkwood, Armada. This
4 * driver supports the TDMA engine on platforms on which it is available.
6 * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
7 * Author: Arnaud Ebalard <arno@natisbad.org>
9 * This work is based on an initial version written by
10 * Sebastian Andrzej Siewior < sebastian at breakpoint dot cc >
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published
14 * by the Free Software Foundation.
17 #include <linux/delay.h>
18 #include <linux/genalloc.h>
19 #include <linux/interrupt.h>
21 #include <linux/kthread.h>
22 #include <linux/mbus.h>
23 #include <linux/platform_device.h>
24 #include <linux/scatterlist.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <linux/clk.h>
29 #include <linux/of_platform.h>
30 #include <linux/of_irq.h>
34 struct mv_cesa_dev *cesa_dev;
36 static void mv_cesa_dequeue_req_unlocked(struct mv_cesa_engine *engine)
38 struct crypto_async_request *req, *backlog;
39 struct mv_cesa_ctx *ctx;
41 spin_lock_bh(&cesa_dev->lock);
42 backlog = crypto_get_backlog(&cesa_dev->queue);
43 req = crypto_dequeue_request(&cesa_dev->queue);
45 spin_unlock_bh(&cesa_dev->lock);
51 backlog->complete(backlog, -EINPROGRESS);
53 ctx = crypto_tfm_ctx(req->tfm);
54 ctx->ops->prepare(req, engine);
58 static irqreturn_t mv_cesa_int(int irq, void *priv)
60 struct mv_cesa_engine *engine = priv;
61 struct crypto_async_request *req;
62 struct mv_cesa_ctx *ctx;
64 irqreturn_t ret = IRQ_NONE;
69 mask = mv_cesa_get_int_mask(engine);
70 status = readl(engine->regs + CESA_SA_INT_STATUS);
76 * TODO: avoid clearing the FPGA_INT_STATUS if this not
77 * relevant on some platforms.
79 writel(~status, engine->regs + CESA_SA_FPGA_INT_STATUS);
80 writel(~status, engine->regs + CESA_SA_INT_STATUS);
83 spin_lock_bh(&engine->lock);
85 spin_unlock_bh(&engine->lock);
87 ctx = crypto_tfm_ctx(req->tfm);
88 res = ctx->ops->process(req, status & mask);
89 if (res != -EINPROGRESS) {
90 spin_lock_bh(&engine->lock);
92 mv_cesa_dequeue_req_unlocked(engine);
93 spin_unlock_bh(&engine->lock);
94 ctx->ops->cleanup(req);
96 req->complete(req, res);
107 int mv_cesa_queue_req(struct crypto_async_request *req)
112 spin_lock_bh(&cesa_dev->lock);
113 ret = crypto_enqueue_request(&cesa_dev->queue, req);
114 spin_unlock_bh(&cesa_dev->lock);
116 if (ret != -EINPROGRESS)
119 for (i = 0; i < cesa_dev->caps->nengines; i++) {
120 spin_lock_bh(&cesa_dev->engines[i].lock);
121 if (!cesa_dev->engines[i].req)
122 mv_cesa_dequeue_req_unlocked(&cesa_dev->engines[i]);
123 spin_unlock_bh(&cesa_dev->engines[i].lock);
129 static int mv_cesa_add_algs(struct mv_cesa_dev *cesa)
134 for (i = 0; i < cesa->caps->ncipher_algs; i++) {
135 ret = crypto_register_alg(cesa->caps->cipher_algs[i]);
137 goto err_unregister_crypto;
140 for (i = 0; i < cesa->caps->nahash_algs; i++) {
141 ret = crypto_register_ahash(cesa->caps->ahash_algs[i]);
143 goto err_unregister_ahash;
148 err_unregister_ahash:
149 for (j = 0; j < i; j++)
150 crypto_unregister_ahash(cesa->caps->ahash_algs[j]);
151 i = cesa->caps->ncipher_algs;
153 err_unregister_crypto:
154 for (j = 0; j < i; j++)
155 crypto_unregister_alg(cesa->caps->cipher_algs[j]);
160 static void mv_cesa_remove_algs(struct mv_cesa_dev *cesa)
164 for (i = 0; i < cesa->caps->nahash_algs; i++)
165 crypto_unregister_ahash(cesa->caps->ahash_algs[i]);
167 for (i = 0; i < cesa->caps->ncipher_algs; i++)
168 crypto_unregister_alg(cesa->caps->cipher_algs[i]);
171 static struct crypto_alg *armada_370_cipher_algs[] = {
172 &mv_cesa_ecb_des_alg,
173 &mv_cesa_cbc_des_alg,
174 &mv_cesa_ecb_des3_ede_alg,
175 &mv_cesa_cbc_des3_ede_alg,
176 &mv_cesa_ecb_aes_alg,
177 &mv_cesa_cbc_aes_alg,
180 static struct ahash_alg *armada_370_ahash_algs[] = {
187 static const struct mv_cesa_caps armada_370_caps = {
189 .cipher_algs = armada_370_cipher_algs,
190 .ncipher_algs = ARRAY_SIZE(armada_370_cipher_algs),
191 .ahash_algs = armada_370_ahash_algs,
192 .nahash_algs = ARRAY_SIZE(armada_370_ahash_algs),
196 static const struct of_device_id mv_cesa_of_match_table[] = {
197 { .compatible = "marvell,armada-370-crypto", .data = &armada_370_caps },
200 MODULE_DEVICE_TABLE(of, mv_cesa_of_match_table);
203 mv_cesa_conf_mbus_windows(struct mv_cesa_engine *engine,
204 const struct mbus_dram_target_info *dram)
206 void __iomem *iobase = engine->regs;
209 for (i = 0; i < 4; i++) {
210 writel(0, iobase + CESA_TDMA_WINDOW_CTRL(i));
211 writel(0, iobase + CESA_TDMA_WINDOW_BASE(i));
214 for (i = 0; i < dram->num_cs; i++) {
215 const struct mbus_dram_window *cs = dram->cs + i;
217 writel(((cs->size - 1) & 0xffff0000) |
218 (cs->mbus_attr << 8) |
219 (dram->mbus_dram_target_id << 4) | 1,
220 iobase + CESA_TDMA_WINDOW_CTRL(i));
221 writel(cs->base, iobase + CESA_TDMA_WINDOW_BASE(i));
225 static int mv_cesa_dev_dma_init(struct mv_cesa_dev *cesa)
227 struct device *dev = cesa->dev;
228 struct mv_cesa_dev_dma *dma;
230 if (!cesa->caps->has_tdma)
233 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
237 dma->tdma_desc_pool = dmam_pool_create("tdma_desc", dev,
238 sizeof(struct mv_cesa_tdma_desc),
240 if (!dma->tdma_desc_pool)
243 dma->op_pool = dmam_pool_create("cesa_op", dev,
244 sizeof(struct mv_cesa_op_ctx), 16, 0);
248 dma->cache_pool = dmam_pool_create("cesa_cache", dev,
249 CESA_MAX_HASH_BLOCK_SIZE, 1, 0);
250 if (!dma->cache_pool)
253 dma->padding_pool = dmam_pool_create("cesa_padding", dev, 72, 1, 0);
254 if (!dma->cache_pool)
262 static int mv_cesa_get_sram(struct platform_device *pdev, int idx)
264 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
265 struct mv_cesa_engine *engine = &cesa->engines[idx];
266 const char *res_name = "sram";
267 struct resource *res;
269 engine->pool = of_get_named_gen_pool(cesa->dev->of_node,
270 "marvell,crypto-srams",
273 engine->sram = gen_pool_dma_alloc(engine->pool,
283 if (cesa->caps->nengines > 1) {
290 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
292 if (!res || resource_size(res) < cesa->sram_size)
295 engine->sram = devm_ioremap_resource(cesa->dev, res);
296 if (IS_ERR(engine->sram))
297 return PTR_ERR(engine->sram);
299 engine->sram_dma = phys_to_dma(cesa->dev,
300 (phys_addr_t)res->start);
305 static void mv_cesa_put_sram(struct platform_device *pdev, int idx)
307 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
308 struct mv_cesa_engine *engine = &cesa->engines[idx];
313 gen_pool_free(engine->pool, (unsigned long)engine->sram,
317 static int mv_cesa_probe(struct platform_device *pdev)
319 const struct mv_cesa_caps *caps = NULL;
320 const struct mbus_dram_target_info *dram;
321 const struct of_device_id *match;
322 struct device *dev = &pdev->dev;
323 struct mv_cesa_dev *cesa;
324 struct mv_cesa_engine *engines;
325 struct resource *res;
330 dev_err(&pdev->dev, "Only one CESA device authorized\n");
337 match = of_match_node(mv_cesa_of_match_table, dev->of_node);
338 if (!match || !match->data)
343 cesa = devm_kzalloc(dev, sizeof(*cesa), GFP_KERNEL);
350 sram_size = CESA_SA_DEFAULT_SRAM_SIZE;
351 of_property_read_u32(cesa->dev->of_node, "marvell,crypto-sram-size",
353 if (sram_size < CESA_SA_MIN_SRAM_SIZE)
354 sram_size = CESA_SA_MIN_SRAM_SIZE;
356 cesa->sram_size = sram_size;
357 cesa->engines = devm_kzalloc(dev, caps->nengines * sizeof(*engines),
362 spin_lock_init(&cesa->lock);
363 crypto_init_queue(&cesa->queue, 50);
364 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
365 cesa->regs = devm_ioremap_resource(dev, res);
366 if (IS_ERR(cesa->regs))
369 ret = mv_cesa_dev_dma_init(cesa);
373 dram = mv_mbus_dram_info_nooverlap();
375 platform_set_drvdata(pdev, cesa);
377 for (i = 0; i < caps->nengines; i++) {
378 struct mv_cesa_engine *engine = &cesa->engines[i];
382 spin_lock_init(&engine->lock);
384 ret = mv_cesa_get_sram(pdev, i);
388 irq = platform_get_irq(pdev, i);
395 * Not all platforms can gate the CESA clocks: do not complain
396 * if the clock does not exist.
398 snprintf(res_name, sizeof(res_name), "cesa%d", i);
399 engine->clk = devm_clk_get(dev, res_name);
400 if (IS_ERR(engine->clk)) {
401 engine->clk = devm_clk_get(dev, NULL);
402 if (IS_ERR(engine->clk))
406 snprintf(res_name, sizeof(res_name), "cesaz%d", i);
407 engine->zclk = devm_clk_get(dev, res_name);
408 if (IS_ERR(engine->zclk))
411 ret = clk_prepare_enable(engine->clk);
415 ret = clk_prepare_enable(engine->zclk);
419 engine->regs = cesa->regs + CESA_ENGINE_OFF(i);
421 if (dram && cesa->caps->has_tdma)
422 mv_cesa_conf_mbus_windows(&cesa->engines[i], dram);
424 writel(0, cesa->engines[i].regs + CESA_SA_INT_STATUS);
425 writel(CESA_SA_CFG_STOP_DIG_ERR,
426 cesa->engines[i].regs + CESA_SA_CFG);
427 writel(engine->sram_dma & CESA_SA_SRAM_MSK,
428 cesa->engines[i].regs + CESA_SA_DESC_P0);
430 ret = devm_request_threaded_irq(dev, irq, NULL, mv_cesa_int,
432 dev_name(&pdev->dev),
440 ret = mv_cesa_add_algs(cesa);
446 dev_info(dev, "CESA device successfully registered\n");
451 for (i = 0; i < caps->nengines; i++) {
452 clk_disable_unprepare(cesa->engines[i].zclk);
453 clk_disable_unprepare(cesa->engines[i].clk);
454 mv_cesa_put_sram(pdev, i);
460 static int mv_cesa_remove(struct platform_device *pdev)
462 struct mv_cesa_dev *cesa = platform_get_drvdata(pdev);
465 mv_cesa_remove_algs(cesa);
467 for (i = 0; i < cesa->caps->nengines; i++) {
468 clk_disable_unprepare(cesa->engines[i].zclk);
469 clk_disable_unprepare(cesa->engines[i].clk);
470 mv_cesa_put_sram(pdev, i);
476 static struct platform_driver marvell_cesa = {
477 .probe = mv_cesa_probe,
478 .remove = mv_cesa_remove,
480 .owner = THIS_MODULE,
481 .name = "marvell-cesa",
482 .of_match_table = mv_cesa_of_match_table,
485 module_platform_driver(marvell_cesa);
487 MODULE_ALIAS("platform:mv_crypto");
488 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
489 MODULE_AUTHOR("Arnaud Ebalard <arno@natisbad.org>");
490 MODULE_DESCRIPTION("Support for Marvell's cryptographic engine");
491 MODULE_LICENSE("GPL v2");