/* * Support for OMAP DES and Triple DES HW acceleration. * * Copyright (c) 2013 Texas Instruments Incorporated * Author: Joel Fernandes <joelf@ti.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * */ #define pr_fmt(fmt) "%s: " fmt, __func__ #ifdef DEBUG #define prn(num) printk(#num "=%d\n", num) #define prx(num) printk(#num "=%x\n", num) #else #define prn(num) do { } while (0) #define prx(num) do { } while (0) #endif #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/omap-dma.h> #include <linux/pm_runtime.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_address.h> #include <linux/io.h> #include <linux/crypto.h> #include <linux/interrupt.h> #include <crypto/scatterwalk.h> #include <crypto/des.h> #define DST_MAXBURST 2 #define DES_BLOCK_WORDS (DES_BLOCK_SIZE >> 2) #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset) #define DES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \ ((x ^ 0x01) * 0x04)) #define DES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04)) #define DES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs) #define DES_REG_CTRL_CBC BIT(4) #define DES_REG_CTRL_TDES BIT(3) #define DES_REG_CTRL_DIRECTION BIT(2) #define DES_REG_CTRL_INPUT_READY BIT(1) #define DES_REG_CTRL_OUTPUT_READY BIT(0) #define DES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04)) #define DES_REG_REV(dd) ((dd)->pdata->rev_ofs) #define DES_REG_MASK(dd) ((dd)->pdata->mask_ofs) #define DES_REG_LENGTH_N(x) (0x24 + ((x) * 0x04)) #define DES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs) #define DES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs) #define DES_REG_IRQ_DATA_IN BIT(1) #define DES_REG_IRQ_DATA_OUT BIT(2) #define FLAGS_MODE_MASK 0x000f #define FLAGS_ENCRYPT BIT(0) #define FLAGS_CBC BIT(1) #define FLAGS_INIT BIT(4) #define FLAGS_BUSY BIT(6) struct omap_des_ctx { struct omap_des_dev *dd; int keylen; u32 key[(3 * DES_KEY_SIZE) / sizeof(u32)]; unsigned long flags; }; struct omap_des_reqctx { unsigned long mode; }; #define OMAP_DES_QUEUE_LENGTH 1 #define OMAP_DES_CACHE_SIZE 0 struct omap_des_algs_info { struct crypto_alg *algs_list; unsigned int size; unsigned int registered; }; struct omap_des_pdata { struct omap_des_algs_info *algs_info; unsigned int algs_info_size; void (*trigger)(struct omap_des_dev *dd, int length); u32 key_ofs; u32 iv_ofs; u32 ctrl_ofs; u32 data_ofs; u32 rev_ofs; u32 mask_ofs; u32 irq_enable_ofs; u32 irq_status_ofs; u32 dma_enable_in; u32 dma_enable_out; u32 dma_start; u32 major_mask; u32 major_shift; u32 minor_mask; u32 minor_shift; }; struct omap_des_dev { struct list_head list; unsigned long phys_base; void __iomem *io_base; struct omap_des_ctx *ctx; struct device *dev; unsigned long flags; int err; /* spinlock used for queues */ spinlock_t lock; struct crypto_queue queue; struct tasklet_struct done_task; struct tasklet_struct queue_task; struct ablkcipher_request *req; /* * total is used by PIO mode for book keeping so introduce * variable total_save as need it to calc page_order */ size_t total; size_t total_save; struct scatterlist *in_sg; struct scatterlist *out_sg; /* Buffers for copying for unaligned cases */ struct scatterlist in_sgl; struct scatterlist out_sgl; struct scatterlist *orig_out; int sgs_copied; struct scatter_walk in_walk; struct scatter_walk out_walk; int dma_in; struct dma_chan *dma_lch_in; int dma_out; struct dma_chan *dma_lch_out; int in_sg_len; int out_sg_len; int pio_only; const struct omap_des_pdata *pdata; }; /* keep registered devices data here */ static LIST_HEAD(dev_list); static DEFINE_SPINLOCK(list_lock); #ifdef DEBUG #define omap_des_read(dd, offset) \ ({ \ int _read_ret; \ _read_ret = __raw_readl(dd->io_base + offset); \ pr_err("omap_des_read(" #offset "=%#x)= %#x\n", \ offset, _read_ret); \ _read_ret; \ }) #else static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset) { return __raw_readl(dd->io_base + offset); } #endif #ifdef DEBUG #define omap_des_write(dd, offset, value) \ do { \ pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \ offset, value); \ __raw_writel(value, dd->io_base + offset); \ } while (0) #else static inline void omap_des_write(struct omap_des_dev *dd, u32 offset, u32 value) { __raw_writel(value, dd->io_base + offset); } #endif static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset, u32 value, u32 mask) { u32 val; val = omap_des_read(dd, offset); val &= ~mask; val |= value; omap_des_write(dd, offset, val); } static void omap_des_write_n(struct omap_des_dev *dd, u32 offset, u32 *value, int count) { for (; count--; value++, offset += 4) omap_des_write(dd, offset, *value); } static int omap_des_hw_init(struct omap_des_dev *dd) { int err; /* * clocks are enabled when request starts and disabled when finished. * It may be long delays between requests. * Device might go to off mode to save power. */ err = pm_runtime_get_sync(dd->dev); if (err < 0) { pm_runtime_put_noidle(dd->dev); dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err); return err; } if (!(dd->flags & FLAGS_INIT)) { dd->flags |= FLAGS_INIT; dd->err = 0; } return 0; } static int omap_des_write_ctrl(struct omap_des_dev *dd) { unsigned int key32; int i, err; u32 val = 0, mask = 0; err = omap_des_hw_init(dd); if (err) return err; key32 = dd->ctx->keylen / sizeof(u32); /* it seems a key should always be set even if it has not changed */ for (i = 0; i < key32; i++) { omap_des_write(dd, DES_REG_KEY(dd, i), __le32_to_cpu(dd->ctx->key[i])); } if ((dd->flags & FLAGS_CBC) && dd->req->info) omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2); if (dd->flags & FLAGS_CBC) val |= DES_REG_CTRL_CBC; if (dd->flags & FLAGS_ENCRYPT) val |= DES_REG_CTRL_DIRECTION; if (key32 == 6) val |= DES_REG_CTRL_TDES; mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES; omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask); return 0; } static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length) { u32 mask, val; omap_des_write(dd, DES_REG_LENGTH_N(0), length); val = dd->pdata->dma_start; if (dd->dma_lch_out != NULL) val |= dd->pdata->dma_enable_out; if (dd->dma_lch_in != NULL) val |= dd->pdata->dma_enable_in; mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | dd->pdata->dma_start; omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask); } static void omap_des_dma_stop(struct omap_des_dev *dd) { u32 mask; mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in | dd->pdata->dma_start; omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask); } static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx) { struct omap_des_dev *dd = NULL, *tmp; spin_lock_bh(&list_lock); if (!ctx->dd) { list_for_each_entry(tmp, &dev_list, list) { /* FIXME: take fist available des core */ dd = tmp; break; } ctx->dd = dd; } else { /* already found before */ dd = ctx->dd; } spin_unlock_bh(&list_lock); return dd; } static void omap_des_dma_out_callback(void *data) { struct omap_des_dev *dd = data; /* dma_lch_out - completed */ tasklet_schedule(&dd->done_task); } static int omap_des_dma_init(struct omap_des_dev *dd) { int err = -ENOMEM; dma_cap_mask_t mask; dd->dma_lch_out = NULL; dd->dma_lch_in = NULL; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); dd->dma_lch_in = dma_request_slave_channel_compat(mask, omap_dma_filter_fn, &dd->dma_in, dd->dev, "rx"); if (!dd->dma_lch_in) { dev_err(dd->dev, "Unable to request in DMA channel\n"); goto err_dma_in; } dd->dma_lch_out = dma_request_slave_channel_compat(mask, omap_dma_filter_fn, &dd->dma_out, dd->dev, "tx"); if (!dd->dma_lch_out) { dev_err(dd->dev, "Unable to request out DMA channel\n"); goto err_dma_out; } return 0; err_dma_out: dma_release_channel(dd->dma_lch_in); err_dma_in: if (err) pr_err("error: %d\n", err); return err; } static void omap_des_dma_cleanup(struct omap_des_dev *dd) { dma_release_channel(dd->dma_lch_out); dma_release_channel(dd->dma_lch_in); } static void sg_copy_buf(void *buf, struct scatterlist *sg, unsigned int start, unsigned int nbytes, int out) { struct scatter_walk walk; if (!nbytes) return; scatterwalk_start(&walk, sg); scatterwalk_advance(&walk, start); scatterwalk_copychunks(buf, &walk, nbytes, out); scatterwalk_done(&walk, out, 0); } static int omap_des_crypt_dma(struct crypto_tfm *tfm, struct scatterlist *in_sg, struct scatterlist *out_sg, int in_sg_len, int out_sg_len) { struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm); struct omap_des_dev *dd = ctx->dd; struct dma_async_tx_descriptor *tx_in, *tx_out; struct dma_slave_config cfg; int ret; if (dd->pio_only) { scatterwalk_start(&dd->in_walk, dd->in_sg); scatterwalk_start(&dd->out_walk, dd->out_sg); /* Enable DATAIN interrupt and let it take care of the rest */ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2); return 0; } dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE); memset(&cfg, 0, sizeof(cfg)); cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0); cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0); cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; cfg.src_maxburst = DST_MAXBURST; cfg.dst_maxburst = DST_MAXBURST; /* IN */ ret = dmaengine_slave_config(dd->dma_lch_in, &cfg); if (ret) { dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n", ret); return ret; } tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!tx_in) { dev_err(dd->dev, "IN prep_slave_sg() failed\n"); return -EINVAL; } /* No callback necessary */ tx_in->callback_param = dd; /* OUT */ ret = dmaengine_slave_config(dd->dma_lch_out, &cfg); if (ret) { dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n", ret); return ret; } tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!tx_out) { dev_err(dd->dev, "OUT prep_slave_sg() failed\n"); return -EINVAL; } tx_out->callback = omap_des_dma_out_callback; tx_out->callback_param = dd; dmaengine_submit(tx_in); dmaengine_submit(tx_out); dma_async_issue_pending(dd->dma_lch_in); dma_async_issue_pending(dd->dma_lch_out); /* start DMA */ dd->pdata->trigger(dd, dd->total); return 0; } static int omap_des_crypt_dma_start(struct omap_des_dev *dd) { struct crypto_tfm *tfm = crypto_ablkcipher_tfm( crypto_ablkcipher_reqtfm(dd->req)); int err; pr_debug("total: %d\n", dd->total); if (!dd->pio_only) { err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); if (!err) { dev_err(dd->dev, "dma_map_sg() error\n"); return -EINVAL; } err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); if (!err) { dev_err(dd->dev, "dma_map_sg() error\n"); return -EINVAL; } } err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len, dd->out_sg_len); if (err && !dd->pio_only) { dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); } return err; } static void omap_des_finish_req(struct omap_des_dev *dd, int err) { struct ablkcipher_request *req = dd->req; pr_debug("err: %d\n", err); pm_runtime_put(dd->dev); dd->flags &= ~FLAGS_BUSY; req->base.complete(&req->base, err); } static int omap_des_crypt_dma_stop(struct omap_des_dev *dd) { pr_debug("total: %d\n", dd->total); omap_des_dma_stop(dd); dmaengine_terminate_all(dd->dma_lch_in); dmaengine_terminate_all(dd->dma_lch_out); return 0; } static int omap_des_copy_needed(struct scatterlist *sg) { while (sg) { if (!IS_ALIGNED(sg->offset, 4)) return -1; if (!IS_ALIGNED(sg->length, DES_BLOCK_SIZE)) return -1; sg = sg_next(sg); } return 0; } static int omap_des_copy_sgs(struct omap_des_dev *dd) { void *buf_in, *buf_out; int pages; pages = dd->total >> PAGE_SHIFT; if (dd->total & (PAGE_SIZE-1)) pages++; BUG_ON(!pages); buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages); buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages); if (!buf_in || !buf_out) { pr_err("Couldn't allocated pages for unaligned cases.\n"); return -1; } dd->orig_out = dd->out_sg; sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0); sg_init_table(&dd->in_sgl, 1); sg_set_buf(&dd->in_sgl, buf_in, dd->total); dd->in_sg = &dd->in_sgl; sg_init_table(&dd->out_sgl, 1); sg_set_buf(&dd->out_sgl, buf_out, dd->total); dd->out_sg = &dd->out_sgl; return 0; } static int omap_des_handle_queue(struct omap_des_dev *dd, struct ablkcipher_request *req) { struct crypto_async_request *async_req, *backlog; struct omap_des_ctx *ctx; struct omap_des_reqctx *rctx; unsigned long flags; int err, ret = 0; spin_lock_irqsave(&dd->lock, flags); if (req) ret = ablkcipher_enqueue_request(&dd->queue, req); if (dd->flags & FLAGS_BUSY) { spin_unlock_irqrestore(&dd->lock, flags); return ret; } backlog = crypto_get_backlog(&dd->queue); async_req = crypto_dequeue_request(&dd->queue); if (async_req) dd->flags |= FLAGS_BUSY; spin_unlock_irqrestore(&dd->lock, flags); if (!async_req) return ret; if (backlog) backlog->complete(backlog, -EINPROGRESS); req = ablkcipher_request_cast(async_req); /* assign new request to device */ dd->req = req; dd->total = req->nbytes; dd->total_save = req->nbytes; dd->in_sg = req->src; dd->out_sg = req->dst; if (omap_des_copy_needed(dd->in_sg) || omap_des_copy_needed(dd->out_sg)) { if (omap_des_copy_sgs(dd)) pr_err("Failed to copy SGs for unaligned cases\n"); dd->sgs_copied = 1; } else { dd->sgs_copied = 0; } dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total); dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total); BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0); rctx = ablkcipher_request_ctx(req); ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)); rctx->mode &= FLAGS_MODE_MASK; dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode; dd->ctx = ctx; ctx->dd = dd; err = omap_des_write_ctrl(dd); if (!err) err = omap_des_crypt_dma_start(dd); if (err) { /* des_task will not finish it, so do it here */ omap_des_finish_req(dd, err); tasklet_schedule(&dd->queue_task); } return ret; /* return ret, which is enqueue return value */ } static void omap_des_done_task(unsigned long data) { struct omap_des_dev *dd = (struct omap_des_dev *)data; void *buf_in, *buf_out; int pages; pr_debug("enter done_task\n"); if (!dd->pio_only) { dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); omap_des_crypt_dma_stop(dd); } if (dd->sgs_copied) { buf_in = sg_virt(&dd->in_sgl); buf_out = sg_virt(&dd->out_sgl); sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1); pages = get_order(dd->total_save); free_pages((unsigned long)buf_in, pages); free_pages((unsigned long)buf_out, pages); } omap_des_finish_req(dd, 0); omap_des_handle_queue(dd, NULL); pr_debug("exit\n"); } static void omap_des_queue_task(unsigned long data) { struct omap_des_dev *dd = (struct omap_des_dev *)data; omap_des_handle_queue(dd, NULL); } static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode) { struct omap_des_ctx *ctx = crypto_ablkcipher_ctx( crypto_ablkcipher_reqtfm(req)); struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req); struct omap_des_dev *dd; pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC)); if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) { pr_err("request size is not exact amount of DES blocks\n"); return -EINVAL; } dd = omap_des_find_dev(ctx); if (!dd) return -ENODEV; rctx->mode = mode; return omap_des_handle_queue(dd, req); } /* ********************** ALG API ************************************ */ static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) { struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm); if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE)) return -EINVAL; pr_debug("enter, keylen: %d\n", keylen); memcpy(ctx->key, key, keylen); ctx->keylen = keylen; return 0; } static int omap_des_ecb_encrypt(struct ablkcipher_request *req) { return omap_des_crypt(req, FLAGS_ENCRYPT); } static int omap_des_ecb_decrypt(struct ablkcipher_request *req) { return omap_des_crypt(req, 0); } static int omap_des_cbc_encrypt(struct ablkcipher_request *req) { return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC); } static int omap_des_cbc_decrypt(struct ablkcipher_request *req) { return omap_des_crypt(req, FLAGS_CBC); } static int omap_des_cra_init(struct crypto_tfm *tfm) { pr_debug("enter\n"); tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx); return 0; } static void omap_des_cra_exit(struct crypto_tfm *tfm) { pr_debug("enter\n"); } /* ********************** ALGS ************************************ */ static struct crypto_alg algs_ecb_cbc[] = { { .cra_name = "ecb(des)", .cra_driver_name = "ecb-des-omap", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, .cra_blocksize = DES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct omap_des_ctx), .cra_alignmask = 0, .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_init = omap_des_cra_init, .cra_exit = omap_des_cra_exit, .cra_u.ablkcipher = { .min_keysize = DES_KEY_SIZE, .max_keysize = DES_KEY_SIZE, .setkey = omap_des_setkey, .encrypt = omap_des_ecb_encrypt, .decrypt = omap_des_ecb_decrypt, } }, { .cra_name = "cbc(des)", .cra_driver_name = "cbc-des-omap", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, .cra_blocksize = DES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct omap_des_ctx), .cra_alignmask = 0, .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_init = omap_des_cra_init, .cra_exit = omap_des_cra_exit, .cra_u.ablkcipher = { .min_keysize = DES_KEY_SIZE, .max_keysize = DES_KEY_SIZE, .ivsize = DES_BLOCK_SIZE, .setkey = omap_des_setkey, .encrypt = omap_des_cbc_encrypt, .decrypt = omap_des_cbc_decrypt, } }, { .cra_name = "ecb(des3_ede)", .cra_driver_name = "ecb-des3-omap", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, .cra_blocksize = DES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct omap_des_ctx), .cra_alignmask = 0, .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_init = omap_des_cra_init, .cra_exit = omap_des_cra_exit, .cra_u.ablkcipher = { .min_keysize = 3*DES_KEY_SIZE, .max_keysize = 3*DES_KEY_SIZE, .setkey = omap_des_setkey, .encrypt = omap_des_ecb_encrypt, .decrypt = omap_des_ecb_decrypt, } }, { .cra_name = "cbc(des3_ede)", .cra_driver_name = "cbc-des3-omap", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC, .cra_blocksize = DES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct omap_des_ctx), .cra_alignmask = 0, .cra_type = &crypto_ablkcipher_type, .cra_module = THIS_MODULE, .cra_init = omap_des_cra_init, .cra_exit = omap_des_cra_exit, .cra_u.ablkcipher = { .min_keysize = 3*DES_KEY_SIZE, .max_keysize = 3*DES_KEY_SIZE, .ivsize = DES_BLOCK_SIZE, .setkey = omap_des_setkey, .encrypt = omap_des_cbc_encrypt, .decrypt = omap_des_cbc_decrypt, } } }; static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = { { .algs_list = algs_ecb_cbc, .size = ARRAY_SIZE(algs_ecb_cbc), }, }; #ifdef CONFIG_OF static const struct omap_des_pdata omap_des_pdata_omap4 = { .algs_info = omap_des_algs_info_ecb_cbc, .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc), .trigger = omap_des_dma_trigger_omap4, .key_ofs = 0x14, .iv_ofs = 0x18, .ctrl_ofs = 0x20, .data_ofs = 0x28, .rev_ofs = 0x30, .mask_ofs = 0x34, .irq_status_ofs = 0x3c, .irq_enable_ofs = 0x40, .dma_enable_in = BIT(5), .dma_enable_out = BIT(6), .major_mask = 0x0700, .major_shift = 8, .minor_mask = 0x003f, .minor_shift = 0, }; static irqreturn_t omap_des_irq(int irq, void *dev_id) { struct omap_des_dev *dd = dev_id; u32 status, i; u32 *src, *dst; status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd)); if (status & DES_REG_IRQ_DATA_IN) { omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0); BUG_ON(!dd->in_sg); BUG_ON(_calc_walked(in) > dd->in_sg->length); src = sg_virt(dd->in_sg) + _calc_walked(in); for (i = 0; i < DES_BLOCK_WORDS; i++) { omap_des_write(dd, DES_REG_DATA_N(dd, i), *src); scatterwalk_advance(&dd->in_walk, 4); if (dd->in_sg->length == _calc_walked(in)) { dd->in_sg = sg_next(dd->in_sg); if (dd->in_sg) { scatterwalk_start(&dd->in_walk, dd->in_sg); src = sg_virt(dd->in_sg) + _calc_walked(in); } } else { src++; } } /* Clear IRQ status */ status &= ~DES_REG_IRQ_DATA_IN; omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status); /* Enable DATA_OUT interrupt */ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4); } else if (status & DES_REG_IRQ_DATA_OUT) { omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0); BUG_ON(!dd->out_sg); BUG_ON(_calc_walked(out) > dd->out_sg->length); dst = sg_virt(dd->out_sg) + _calc_walked(out); for (i = 0; i < DES_BLOCK_WORDS; i++) { *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i)); scatterwalk_advance(&dd->out_walk, 4); if (dd->out_sg->length == _calc_walked(out)) { dd->out_sg = sg_next(dd->out_sg); if (dd->out_sg) { scatterwalk_start(&dd->out_walk, dd->out_sg); dst = sg_virt(dd->out_sg) + _calc_walked(out); } } else { dst++; } } BUG_ON(dd->total < DES_BLOCK_SIZE); dd->total -= DES_BLOCK_SIZE; /* Clear IRQ status */ status &= ~DES_REG_IRQ_DATA_OUT; omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status); if (!dd->total) /* All bytes read! */ tasklet_schedule(&dd->done_task); else /* Enable DATA_IN interrupt for next block */ omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2); } return IRQ_HANDLED; } static const struct of_device_id omap_des_of_match[] = { { .compatible = "ti,omap4-des", .data = &omap_des_pdata_omap4, }, {}, }; MODULE_DEVICE_TABLE(of, omap_des_of_match); static int omap_des_get_of(struct omap_des_dev *dd, struct platform_device *pdev) { const struct of_device_id *match; match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev); if (!match) { dev_err(&pdev->dev, "no compatible OF match\n"); return -EINVAL; } dd->dma_out = -1; /* Dummy value that's unused */ dd->dma_in = -1; /* Dummy value that's unused */ dd->pdata = match->data; return 0; } #else static int omap_des_get_of(struct omap_des_dev *dd, struct device *dev) { return -EINVAL; } #endif static int omap_des_get_pdev(struct omap_des_dev *dd, struct platform_device *pdev) { struct device *dev = &pdev->dev; struct resource *r; int err = 0; /* Get the DMA out channel */ r = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!r) { dev_err(dev, "no DMA out resource info\n"); err = -ENODEV; goto err; } dd->dma_out = r->start; /* Get the DMA in channel */ r = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!r) { dev_err(dev, "no DMA in resource info\n"); err = -ENODEV; goto err; } dd->dma_in = r->start; /* non-DT devices get pdata from pdev */ dd->pdata = pdev->dev.platform_data; err: return err; } static int omap_des_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct omap_des_dev *dd; struct crypto_alg *algp; struct resource *res; int err = -ENOMEM, i, j, irq = -1; u32 reg; dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL); if (dd == NULL) { dev_err(dev, "unable to alloc data struct.\n"); goto err_data; } dd->dev = dev; platform_set_drvdata(pdev, dd); spin_lock_init(&dd->lock); crypto_init_queue(&dd->queue, OMAP_DES_QUEUE_LENGTH); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "no MEM resource info\n"); goto err_res; } err = (dev->of_node) ? omap_des_get_of(dd, pdev) : omap_des_get_pdev(dd, pdev); if (err) goto err_res; dd->io_base = devm_ioremap_resource(dev, res); if (IS_ERR(dd->io_base)) { err = PTR_ERR(dd->io_base); goto err_res; } dd->phys_base = res->start; pm_runtime_enable(dev); pm_runtime_irq_safe(dev); err = pm_runtime_get_sync(dev); if (err < 0) { pm_runtime_put_noidle(dev); dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err); goto err_get; } omap_des_dma_stop(dd); reg = omap_des_read(dd, DES_REG_REV(dd)); pm_runtime_put_sync(dev); dev_info(dev, "OMAP DES hw accel rev: %u.%u\n", (reg & dd->pdata->major_mask) >> dd->pdata->major_shift, (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift); tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd); tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd); err = omap_des_dma_init(dd); if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) { dd->pio_only = 1; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "can't get IRQ resource\n"); goto err_irq; } err = devm_request_irq(dev, irq, omap_des_irq, 0, dev_name(dev), dd); if (err) { dev_err(dev, "Unable to grab omap-des IRQ\n"); goto err_irq; } } INIT_LIST_HEAD(&dd->list); spin_lock(&list_lock); list_add_tail(&dd->list, &dev_list); spin_unlock(&list_lock); for (i = 0; i < dd->pdata->algs_info_size; i++) { for (j = 0; j < dd->pdata->algs_info[i].size; j++) { algp = &dd->pdata->algs_info[i].algs_list[j]; pr_debug("reg alg: %s\n", algp->cra_name); INIT_LIST_HEAD(&algp->cra_list); err = crypto_register_alg(algp); if (err) goto err_algs; dd->pdata->algs_info[i].registered++; } } return 0; err_algs: for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) crypto_unregister_alg( &dd->pdata->algs_info[i].algs_list[j]); if (!dd->pio_only) omap_des_dma_cleanup(dd); err_irq: tasklet_kill(&dd->done_task); tasklet_kill(&dd->queue_task); err_get: pm_runtime_disable(dev); err_res: dd = NULL; err_data: dev_err(dev, "initialization failed.\n"); return err; } static int omap_des_remove(struct platform_device *pdev) { struct omap_des_dev *dd = platform_get_drvdata(pdev); int i, j; if (!dd) return -ENODEV; spin_lock(&list_lock); list_del(&dd->list); spin_unlock(&list_lock); for (i = dd->pdata->algs_info_size - 1; i >= 0; i--) for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) crypto_unregister_alg( &dd->pdata->algs_info[i].algs_list[j]); tasklet_kill(&dd->done_task); tasklet_kill(&dd->queue_task); omap_des_dma_cleanup(dd); pm_runtime_disable(dd->dev); dd = NULL; return 0; } #ifdef CONFIG_PM_SLEEP static int omap_des_suspend(struct device *dev) { pm_runtime_put_sync(dev); return 0; } static int omap_des_resume(struct device *dev) { int err; err = pm_runtime_get_sync(dev); if (err < 0) { pm_runtime_put_noidle(dev); dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err); return err; } return 0; } #endif static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume); static struct platform_driver omap_des_driver = { .probe = omap_des_probe, .remove = omap_des_remove, .driver = { .name = "omap-des", .pm = &omap_des_pm_ops, .of_match_table = of_match_ptr(omap_des_of_match), }, }; module_platform_driver(omap_des_driver); MODULE_DESCRIPTION("OMAP DES hw acceleration support."); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Joel Fernandes <joelf@ti.com>");