/** * AMCC SoC PPC4xx Crypto Driver * * Copyright (c) 2008 Applied Micro Circuits Corporation. * All rights reserved. James Hsiao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * This file implements AMCC crypto offload Linux device driver for use with * Linux CryptoAPI. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "crypto4xx_reg_def.h" #include "crypto4xx_core.h" #include "crypto4xx_sa.h" #include "crypto4xx_trng.h" #define PPC4XX_SEC_VERSION_STR "0.5" /** * PPC4xx Crypto Engine Initialization Routine */ static void crypto4xx_hw_init(struct crypto4xx_device *dev) { union ce_ring_size ring_size; union ce_ring_control ring_ctrl; union ce_part_ring_size part_ring_size; union ce_io_threshold io_threshold; u32 rand_num; union ce_pe_dma_cfg pe_dma_cfg; u32 device_ctrl; writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG); /* setup pe dma, include reset sg, pdr and pe, then release reset */ pe_dma_cfg.w = 0; pe_dma_cfg.bf.bo_sgpd_en = 1; pe_dma_cfg.bf.bo_data_en = 0; pe_dma_cfg.bf.bo_sa_en = 1; pe_dma_cfg.bf.bo_pd_en = 1; pe_dma_cfg.bf.dynamic_sa_en = 1; pe_dma_cfg.bf.reset_sg = 1; pe_dma_cfg.bf.reset_pdr = 1; pe_dma_cfg.bf.reset_pe = 1; writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); /* un reset pe,sg and pdr */ pe_dma_cfg.bf.pe_mode = 0; pe_dma_cfg.bf.reset_sg = 0; pe_dma_cfg.bf.reset_pdr = 0; pe_dma_cfg.bf.reset_pe = 0; pe_dma_cfg.bf.bo_td_en = 0; writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_PDR_BASE); writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_RDR_BASE); writel(PPC4XX_PRNG_CTRL_AUTO_EN, dev->ce_base + CRYPTO4XX_PRNG_CTRL); get_random_bytes(&rand_num, sizeof(rand_num)); writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_L); get_random_bytes(&rand_num, sizeof(rand_num)); writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_H); ring_size.w = 0; ring_size.bf.ring_offset = PPC4XX_PD_SIZE; ring_size.bf.ring_size = PPC4XX_NUM_PD; writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE); ring_ctrl.w = 0; writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL); device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL); device_ctrl |= PPC4XX_DC_3DES_EN; writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL); writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE); writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE); part_ring_size.w = 0; part_ring_size.bf.sdr_size = PPC4XX_SDR_SIZE; part_ring_size.bf.gdr_size = PPC4XX_GDR_SIZE; writel(part_ring_size.w, dev->ce_base + CRYPTO4XX_PART_RING_SIZE); writel(PPC4XX_SD_BUFFER_SIZE, dev->ce_base + CRYPTO4XX_PART_RING_CFG); io_threshold.w = 0; io_threshold.bf.output_threshold = PPC4XX_OUTPUT_THRESHOLD; io_threshold.bf.input_threshold = PPC4XX_INPUT_THRESHOLD; writel(io_threshold.w, dev->ce_base + CRYPTO4XX_IO_THRESHOLD); writel(0, dev->ce_base + CRYPTO4XX_PDR_BASE_UADDR); writel(0, dev->ce_base + CRYPTO4XX_RDR_BASE_UADDR); writel(0, dev->ce_base + CRYPTO4XX_PKT_SRC_UADDR); writel(0, dev->ce_base + CRYPTO4XX_PKT_DEST_UADDR); writel(0, dev->ce_base + CRYPTO4XX_SA_UADDR); writel(0, dev->ce_base + CRYPTO4XX_GATH_RING_BASE_UADDR); writel(0, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE_UADDR); /* un reset pe,sg and pdr */ pe_dma_cfg.bf.pe_mode = 1; pe_dma_cfg.bf.reset_sg = 0; pe_dma_cfg.bf.reset_pdr = 0; pe_dma_cfg.bf.reset_pe = 0; pe_dma_cfg.bf.bo_td_en = 0; writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG); /*clear all pending interrupt*/ writel(PPC4XX_INTERRUPT_CLR, dev->ce_base + CRYPTO4XX_INT_CLR); writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT); writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT); writel(PPC4XX_INT_CFG, dev->ce_base + CRYPTO4XX_INT_CFG); writel(PPC4XX_PD_DONE_INT, dev->ce_base + CRYPTO4XX_INT_EN); } int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size) { ctx->sa_in = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4, &ctx->sa_in_dma_addr, GFP_ATOMIC); if (ctx->sa_in == NULL) return -ENOMEM; ctx->sa_out = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4, &ctx->sa_out_dma_addr, GFP_ATOMIC); if (ctx->sa_out == NULL) { dma_free_coherent(ctx->dev->core_dev->device, size * 4, ctx->sa_in, ctx->sa_in_dma_addr); return -ENOMEM; } memset(ctx->sa_in, 0, size * 4); memset(ctx->sa_out, 0, size * 4); ctx->sa_len = size; return 0; } void crypto4xx_free_sa(struct crypto4xx_ctx *ctx) { if (ctx->sa_in != NULL) dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4, ctx->sa_in, ctx->sa_in_dma_addr); if (ctx->sa_out != NULL) dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4, ctx->sa_out, ctx->sa_out_dma_addr); ctx->sa_in_dma_addr = 0; ctx->sa_out_dma_addr = 0; ctx->sa_len = 0; } u32 crypto4xx_alloc_state_record(struct crypto4xx_ctx *ctx) { ctx->state_record = dma_alloc_coherent(ctx->dev->core_dev->device, sizeof(struct sa_state_record), &ctx->state_record_dma_addr, GFP_ATOMIC); if (!ctx->state_record_dma_addr) return -ENOMEM; memset(ctx->state_record, 0, sizeof(struct sa_state_record)); return 0; } void crypto4xx_free_state_record(struct crypto4xx_ctx *ctx) { if (ctx->state_record != NULL) dma_free_coherent(ctx->dev->core_dev->device, sizeof(struct sa_state_record), ctx->state_record, ctx->state_record_dma_addr); ctx->state_record_dma_addr = 0; } /** * alloc memory for the gather ring * no need to alloc buf for the ring * gdr_tail, gdr_head and gdr_count are initialized by this function */ static u32 crypto4xx_build_pdr(struct crypto4xx_device *dev) { int i; dev->pdr = dma_alloc_coherent(dev->core_dev->device, sizeof(struct ce_pd) * PPC4XX_NUM_PD, &dev->pdr_pa, GFP_ATOMIC); if (!dev->pdr) return -ENOMEM; dev->pdr_uinfo = kzalloc(sizeof(struct pd_uinfo) * PPC4XX_NUM_PD, GFP_KERNEL); if (!dev->pdr_uinfo) { dma_free_coherent(dev->core_dev->device, sizeof(struct ce_pd) * PPC4XX_NUM_PD, dev->pdr, dev->pdr_pa); return -ENOMEM; } memset(dev->pdr, 0, sizeof(struct ce_pd) * PPC4XX_NUM_PD); dev->shadow_sa_pool = dma_alloc_coherent(dev->core_dev->device, sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD, &dev->shadow_sa_pool_pa, GFP_ATOMIC); if (!dev->shadow_sa_pool) return -ENOMEM; dev->shadow_sr_pool = dma_alloc_coherent(dev->core_dev->device, sizeof(struct sa_state_record) * PPC4XX_NUM_PD, &dev->shadow_sr_pool_pa, GFP_ATOMIC); if (!dev->shadow_sr_pool) return -ENOMEM; for (i = 0; i < PPC4XX_NUM_PD; i++) { struct ce_pd *pd = &dev->pdr[i]; struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[i]; pd->sa = dev->shadow_sa_pool_pa + sizeof(union shadow_sa_buf) * i; /* alloc 256 bytes which is enough for any kind of dynamic sa */ pd_uinfo->sa_va = &dev->shadow_sa_pool[i].sa; /* alloc state record */ pd_uinfo->sr_va = &dev->shadow_sr_pool[i]; pd_uinfo->sr_pa = dev->shadow_sr_pool_pa + sizeof(struct sa_state_record) * i; } return 0; } static void crypto4xx_destroy_pdr(struct crypto4xx_device *dev) { if (dev->pdr) dma_free_coherent(dev->core_dev->device, sizeof(struct ce_pd) * PPC4XX_NUM_PD, dev->pdr, dev->pdr_pa); if (dev->shadow_sa_pool) dma_free_coherent(dev->core_dev->device, sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD, dev->shadow_sa_pool, dev->shadow_sa_pool_pa); if (dev->shadow_sr_pool) dma_free_coherent(dev->core_dev->device, sizeof(struct sa_state_record) * PPC4XX_NUM_PD, dev->shadow_sr_pool, dev->shadow_sr_pool_pa); kfree(dev->pdr_uinfo); } static u32 crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device *dev) { u32 retval; u32 tmp; retval = dev->pdr_head; tmp = (dev->pdr_head + 1) % PPC4XX_NUM_PD; if (tmp == dev->pdr_tail) return ERING_WAS_FULL; dev->pdr_head = tmp; return retval; } static u32 crypto4xx_put_pd_to_pdr(struct crypto4xx_device *dev, u32 idx) { struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx]; unsigned long flags; spin_lock_irqsave(&dev->core_dev->lock, flags); if (dev->pdr_tail != PPC4XX_LAST_PD) dev->pdr_tail++; else dev->pdr_tail = 0; pd_uinfo->state = PD_ENTRY_FREE; spin_unlock_irqrestore(&dev->core_dev->lock, flags); return 0; } /** * alloc memory for the gather ring * no need to alloc buf for the ring * gdr_tail, gdr_head and gdr_count are initialized by this function */ static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev) { dev->gdr = dma_alloc_coherent(dev->core_dev->device, sizeof(struct ce_gd) * PPC4XX_NUM_GD, &dev->gdr_pa, GFP_ATOMIC); if (!dev->gdr) return -ENOMEM; memset(dev->gdr, 0, sizeof(struct ce_gd) * PPC4XX_NUM_GD); return 0; } static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev) { dma_free_coherent(dev->core_dev->device, sizeof(struct ce_gd) * PPC4XX_NUM_GD, dev->gdr, dev->gdr_pa); } /* * when this function is called. * preemption or interrupt must be disabled */ u32 crypto4xx_get_n_gd(struct crypto4xx_device *dev, int n) { u32 retval; u32 tmp; if (n >= PPC4XX_NUM_GD) return ERING_WAS_FULL; retval = dev->gdr_head; tmp = (dev->gdr_head + n) % PPC4XX_NUM_GD; if (dev->gdr_head > dev->gdr_tail) { if (tmp < dev->gdr_head && tmp >= dev->gdr_tail) return ERING_WAS_FULL; } else if (dev->gdr_head < dev->gdr_tail) { if (tmp < dev->gdr_head || tmp >= dev->gdr_tail) return ERING_WAS_FULL; } dev->gdr_head = tmp; return retval; } static u32 crypto4xx_put_gd_to_gdr(struct crypto4xx_device *dev) { unsigned long flags; spin_lock_irqsave(&dev->core_dev->lock, flags); if (dev->gdr_tail == dev->gdr_head) { spin_unlock_irqrestore(&dev->core_dev->lock, flags); return 0; } if (dev->gdr_tail != PPC4XX_LAST_GD) dev->gdr_tail++; else dev->gdr_tail = 0; spin_unlock_irqrestore(&dev->core_dev->lock, flags); return 0; } static inline struct ce_gd *crypto4xx_get_gdp(struct crypto4xx_device *dev, dma_addr_t *gd_dma, u32 idx) { *gd_dma = dev->gdr_pa + sizeof(struct ce_gd) * idx; return &dev->gdr[idx]; } /** * alloc memory for the scatter ring * need to alloc buf for the ring * sdr_tail, sdr_head and sdr_count are initialized by this function */ static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev) { int i; /* alloc memory for scatter descriptor ring */ dev->sdr = dma_alloc_coherent(dev->core_dev->device, sizeof(struct ce_sd) * PPC4XX_NUM_SD, &dev->sdr_pa, GFP_ATOMIC); if (!dev->sdr) return -ENOMEM; dev->scatter_buffer_va = dma_alloc_coherent(dev->core_dev->device, PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD, &dev->scatter_buffer_pa, GFP_ATOMIC); if (!dev->scatter_buffer_va) { dma_free_coherent(dev->core_dev->device, sizeof(struct ce_sd) * PPC4XX_NUM_SD, dev->sdr, dev->sdr_pa); return -ENOMEM; } for (i = 0; i < PPC4XX_NUM_SD; i++) { dev->sdr[i].ptr = dev->scatter_buffer_pa + PPC4XX_SD_BUFFER_SIZE * i; } return 0; } static void crypto4xx_destroy_sdr(struct crypto4xx_device *dev) { if (dev->sdr) dma_free_coherent(dev->core_dev->device, sizeof(struct ce_sd) * PPC4XX_NUM_SD, dev->sdr, dev->sdr_pa); if (dev->scatter_buffer_va) dma_free_coherent(dev->core_dev->device, PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD, dev->scatter_buffer_va, dev->scatter_buffer_pa); } /* * when this function is called. * preemption or interrupt must be disabled */ static u32 crypto4xx_get_n_sd(struct crypto4xx_device *dev, int n) { u32 retval; u32 tmp; if (n >= PPC4XX_NUM_SD) return ERING_WAS_FULL; retval = dev->sdr_head; tmp = (dev->sdr_head + n) % PPC4XX_NUM_SD; if (dev->sdr_head > dev->gdr_tail) { if (tmp < dev->sdr_head && tmp >= dev->sdr_tail) return ERING_WAS_FULL; } else if (dev->sdr_head < dev->sdr_tail) { if (tmp < dev->sdr_head || tmp >= dev->sdr_tail) return ERING_WAS_FULL; } /* the head = tail, or empty case is already take cared */ dev->sdr_head = tmp; return retval; } static u32 crypto4xx_put_sd_to_sdr(struct crypto4xx_device *dev) { unsigned long flags; spin_lock_irqsave(&dev->core_dev->lock, flags); if (dev->sdr_tail == dev->sdr_head) { spin_unlock_irqrestore(&dev->core_dev->lock, flags); return 0; } if (dev->sdr_tail != PPC4XX_LAST_SD) dev->sdr_tail++; else dev->sdr_tail = 0; spin_unlock_irqrestore(&dev->core_dev->lock, flags); return 0; } static inline struct ce_sd *crypto4xx_get_sdp(struct crypto4xx_device *dev, dma_addr_t *sd_dma, u32 idx) { *sd_dma = dev->sdr_pa + sizeof(struct ce_sd) * idx; return &dev->sdr[idx]; } static void crypto4xx_copy_pkt_to_dst(struct crypto4xx_device *dev, struct ce_pd *pd, struct pd_uinfo *pd_uinfo, u32 nbytes, struct scatterlist *dst) { unsigned int first_sd = pd_uinfo->first_sd; unsigned int last_sd; unsigned int overflow = 0; unsigned int to_copy; unsigned int dst_start = 0; /* * Because the scatter buffers are all neatly organized in one * big continuous ringbuffer; scatterwalk_map_and_copy() can * be instructed to copy a range of buffers in one go. */ last_sd = (first_sd + pd_uinfo->num_sd); if (last_sd > PPC4XX_LAST_SD) { last_sd = PPC4XX_LAST_SD; overflow = last_sd % PPC4XX_NUM_SD; } while (nbytes) { void *buf = dev->scatter_buffer_va + first_sd * PPC4XX_SD_BUFFER_SIZE; to_copy = min(nbytes, PPC4XX_SD_BUFFER_SIZE * (1 + last_sd - first_sd)); scatterwalk_map_and_copy(buf, dst, dst_start, to_copy, 1); nbytes -= to_copy; if (overflow) { first_sd = 0; last_sd = overflow; dst_start += to_copy; overflow = 0; } } } static void crypto4xx_copy_digest_to_dst(void *dst, struct pd_uinfo *pd_uinfo, struct crypto4xx_ctx *ctx) { struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *) ctx->sa_in; if (sa->sa_command_0.bf.hash_alg == SA_HASH_ALG_SHA1) { memcpy(dst, pd_uinfo->sr_va->save_digest, SA_HASH_ALG_SHA1_DIGEST_SIZE); } } static void crypto4xx_ret_sg_desc(struct crypto4xx_device *dev, struct pd_uinfo *pd_uinfo) { int i; if (pd_uinfo->num_gd) { for (i = 0; i < pd_uinfo->num_gd; i++) crypto4xx_put_gd_to_gdr(dev); pd_uinfo->first_gd = 0xffffffff; pd_uinfo->num_gd = 0; } if (pd_uinfo->num_sd) { for (i = 0; i < pd_uinfo->num_sd; i++) crypto4xx_put_sd_to_sdr(dev); pd_uinfo->first_sd = 0xffffffff; pd_uinfo->num_sd = 0; } } static u32 crypto4xx_ablkcipher_done(struct crypto4xx_device *dev, struct pd_uinfo *pd_uinfo, struct ce_pd *pd) { struct crypto4xx_ctx *ctx; struct ablkcipher_request *ablk_req; struct scatterlist *dst; dma_addr_t addr; ablk_req = ablkcipher_request_cast(pd_uinfo->async_req); ctx = crypto_tfm_ctx(ablk_req->base.tfm); if (pd_uinfo->using_sd) { crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo, ablk_req->nbytes, ablk_req->dst); } else { dst = pd_uinfo->dest_va; addr = dma_map_page(dev->core_dev->device, sg_page(dst), dst->offset, dst->length, DMA_FROM_DEVICE); } crypto4xx_ret_sg_desc(dev, pd_uinfo); if (pd_uinfo->state & PD_ENTRY_BUSY) ablkcipher_request_complete(ablk_req, -EINPROGRESS); ablkcipher_request_complete(ablk_req, 0); return 0; } static u32 crypto4xx_ahash_done(struct crypto4xx_device *dev, struct pd_uinfo *pd_uinfo) { struct crypto4xx_ctx *ctx; struct ahash_request *ahash_req; ahash_req = ahash_request_cast(pd_uinfo->async_req); ctx = crypto_tfm_ctx(ahash_req->base.tfm); crypto4xx_copy_digest_to_dst(ahash_req->result, pd_uinfo, crypto_tfm_ctx(ahash_req->base.tfm)); crypto4xx_ret_sg_desc(dev, pd_uinfo); if (pd_uinfo->state & PD_ENTRY_BUSY) ahash_request_complete(ahash_req, -EINPROGRESS); ahash_request_complete(ahash_req, 0); return 0; } static u32 crypto4xx_pd_done(struct crypto4xx_device *dev, u32 idx) { struct ce_pd *pd = &dev->pdr[idx]; struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx]; if (crypto_tfm_alg_type(pd_uinfo->async_req->tfm) == CRYPTO_ALG_TYPE_ABLKCIPHER) return crypto4xx_ablkcipher_done(dev, pd_uinfo, pd); else return crypto4xx_ahash_done(dev, pd_uinfo); } static void crypto4xx_stop_all(struct crypto4xx_core_device *core_dev) { crypto4xx_destroy_pdr(core_dev->dev); crypto4xx_destroy_gdr(core_dev->dev); crypto4xx_destroy_sdr(core_dev->dev); iounmap(core_dev->dev->ce_base); kfree(core_dev->dev); kfree(core_dev); } void crypto4xx_return_pd(struct crypto4xx_device *dev, u32 pd_entry, struct ce_pd *pd, struct pd_uinfo *pd_uinfo) { /* irq should be already disabled */ dev->pdr_head = pd_entry; pd->pd_ctl.w = 0; pd->pd_ctl_len.w = 0; pd_uinfo->state = PD_ENTRY_FREE; } static u32 get_next_gd(u32 current) { if (current != PPC4XX_LAST_GD) return current + 1; else return 0; } static u32 get_next_sd(u32 current) { if (current != PPC4XX_LAST_SD) return current + 1; else return 0; } int crypto4xx_build_pd(struct crypto_async_request *req, struct crypto4xx_ctx *ctx, struct scatterlist *src, struct scatterlist *dst, const unsigned int datalen, const __le32 *iv, const u32 iv_len, const struct dynamic_sa_ctl *req_sa, const unsigned int sa_len) { struct crypto4xx_device *dev = ctx->dev; struct dynamic_sa_ctl *sa; struct ce_gd *gd; struct ce_pd *pd; u32 num_gd, num_sd; u32 fst_gd = 0xffffffff; u32 fst_sd = 0xffffffff; u32 pd_entry; unsigned long flags; struct pd_uinfo *pd_uinfo; unsigned int nbytes = datalen; size_t offset_to_sr_ptr; u32 gd_idx = 0; bool is_busy; /* figure how many gd is needed */ num_gd = sg_nents_for_len(src, datalen); if ((int)num_gd < 0) { dev_err(dev->core_dev->device, "Invalid number of src SG.\n"); return -EINVAL; } if (num_gd == 1) num_gd = 0; /* figure how many sd is needed */ if (sg_is_last(dst)) { num_sd = 0; } else { if (datalen > PPC4XX_SD_BUFFER_SIZE) { num_sd = datalen / PPC4XX_SD_BUFFER_SIZE; if (datalen % PPC4XX_SD_BUFFER_SIZE) num_sd++; } else { num_sd = 1; } } /* * The follow section of code needs to be protected * The gather ring and scatter ring needs to be consecutive * In case of run out of any kind of descriptor, the descriptor * already got must be return the original place. */ spin_lock_irqsave(&dev->core_dev->lock, flags); /* * Let the caller know to slow down, once more than 13/16ths = 81% * of the available data contexts are being used simultaneously. * * With PPC4XX_NUM_PD = 256, this will leave a "backlog queue" for * 31 more contexts. Before new requests have to be rejected. */ if (req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG) { is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >= ((PPC4XX_NUM_PD * 13) / 16); } else { /* * To fix contention issues between ipsec (no blacklog) and * dm-crypto (backlog) reserve 32 entries for "no backlog" * data contexts. */ is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >= ((PPC4XX_NUM_PD * 15) / 16); if (is_busy) { spin_unlock_irqrestore(&dev->core_dev->lock, flags); return -EBUSY; } } if (num_gd) { fst_gd = crypto4xx_get_n_gd(dev, num_gd); if (fst_gd == ERING_WAS_FULL) { spin_unlock_irqrestore(&dev->core_dev->lock, flags); return -EAGAIN; } } if (num_sd) { fst_sd = crypto4xx_get_n_sd(dev, num_sd); if (fst_sd == ERING_WAS_FULL) { if (num_gd) dev->gdr_head = fst_gd; spin_unlock_irqrestore(&dev->core_dev->lock, flags); return -EAGAIN; } } pd_entry = crypto4xx_get_pd_from_pdr_nolock(dev); if (pd_entry == ERING_WAS_FULL) { if (num_gd) dev->gdr_head = fst_gd; if (num_sd) dev->sdr_head = fst_sd; spin_unlock_irqrestore(&dev->core_dev->lock, flags); return -EAGAIN; } spin_unlock_irqrestore(&dev->core_dev->lock, flags); pd = &dev->pdr[pd_entry]; pd->sa_len = sa_len; pd_uinfo = &dev->pdr_uinfo[pd_entry]; pd_uinfo->async_req = req; pd_uinfo->num_gd = num_gd; pd_uinfo->num_sd = num_sd; if (iv_len) memcpy(pd_uinfo->sr_va->save_iv, iv, iv_len); sa = pd_uinfo->sa_va; memcpy(sa, req_sa, sa_len * 4); offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(sa); *(u32 *)((unsigned long)sa + offset_to_sr_ptr) = pd_uinfo->sr_pa; if (num_gd) { dma_addr_t gd_dma; struct scatterlist *sg; /* get first gd we are going to use */ gd_idx = fst_gd; pd_uinfo->first_gd = fst_gd; pd_uinfo->num_gd = num_gd; gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx); pd->src = gd_dma; /* enable gather */ sa->sa_command_0.bf.gather = 1; /* walk the sg, and setup gather array */ sg = src; while (nbytes) { size_t len; len = min(sg->length, nbytes); gd->ptr = dma_map_page(dev->core_dev->device, sg_page(sg), sg->offset, len, DMA_TO_DEVICE); gd->ctl_len.len = len; gd->ctl_len.done = 0; gd->ctl_len.ready = 1; if (len >= nbytes) break; nbytes -= sg->length; gd_idx = get_next_gd(gd_idx); gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx); sg = sg_next(sg); } } else { pd->src = (u32)dma_map_page(dev->core_dev->device, sg_page(src), src->offset, min(nbytes, src->length), DMA_TO_DEVICE); /* * Disable gather in sa command */ sa->sa_command_0.bf.gather = 0; /* * Indicate gather array is not used */ pd_uinfo->first_gd = 0xffffffff; pd_uinfo->num_gd = 0; } if (sg_is_last(dst)) { /* * we know application give us dst a whole piece of memory * no need to use scatter ring. */ pd_uinfo->using_sd = 0; pd_uinfo->first_sd = 0xffffffff; pd_uinfo->num_sd = 0; pd_uinfo->dest_va = dst; sa->sa_command_0.bf.scatter = 0; pd->dest = (u32)dma_map_page(dev->core_dev->device, sg_page(dst), dst->offset, min(datalen, dst->length), DMA_TO_DEVICE); } else { dma_addr_t sd_dma; struct ce_sd *sd = NULL; u32 sd_idx = fst_sd; nbytes = datalen; sa->sa_command_0.bf.scatter = 1; pd_uinfo->using_sd = 1; pd_uinfo->dest_va = dst; pd_uinfo->first_sd = fst_sd; pd_uinfo->num_sd = num_sd; sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx); pd->dest = sd_dma; /* setup scatter descriptor */ sd->ctl.done = 0; sd->ctl.rdy = 1; /* sd->ptr should be setup by sd_init routine*/ if (nbytes >= PPC4XX_SD_BUFFER_SIZE) nbytes -= PPC4XX_SD_BUFFER_SIZE; else nbytes = 0; while (nbytes) { sd_idx = get_next_sd(sd_idx); sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx); /* setup scatter descriptor */ sd->ctl.done = 0; sd->ctl.rdy = 1; if (nbytes >= PPC4XX_SD_BUFFER_SIZE) { nbytes -= PPC4XX_SD_BUFFER_SIZE; } else { /* * SD entry can hold PPC4XX_SD_BUFFER_SIZE, * which is more than nbytes, so done. */ nbytes = 0; } } } sa->sa_command_1.bf.hash_crypto_offset = 0; pd->pd_ctl.w = 0; pd->pd_ctl.bf.hash_final = (crypto_tfm_alg_type(req->tfm) == CRYPTO_ALG_TYPE_AHASH); pd->pd_ctl.bf.host_ready = 1; pd->pd_ctl_len.w = 0x00400000 | datalen; pd_uinfo->state = PD_ENTRY_INUSE | (is_busy ? PD_ENTRY_BUSY : 0); wmb(); /* write any value to push engine to read a pd */ writel(1, dev->ce_base + CRYPTO4XX_INT_DESCR_RD); return is_busy ? -EBUSY : -EINPROGRESS; } /** * Algorithm Registration Functions */ static int crypto4xx_alg_init(struct crypto_tfm *tfm) { struct crypto_alg *alg = tfm->__crt_alg; struct crypto4xx_alg *amcc_alg = crypto_alg_to_crypto4xx_alg(alg); struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); ctx->dev = amcc_alg->dev; ctx->sa_in = NULL; ctx->sa_out = NULL; ctx->sa_in_dma_addr = 0; ctx->sa_out_dma_addr = 0; ctx->sa_len = 0; switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { default: tfm->crt_ablkcipher.reqsize = sizeof(struct crypto4xx_ctx); break; case CRYPTO_ALG_TYPE_AHASH: crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), sizeof(struct crypto4xx_ctx)); break; } return 0; } static void crypto4xx_alg_exit(struct crypto_tfm *tfm) { struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm); crypto4xx_free_sa(ctx); crypto4xx_free_state_record(ctx); } int crypto4xx_register_alg(struct crypto4xx_device *sec_dev, struct crypto4xx_alg_common *crypto_alg, int array_size) { struct crypto4xx_alg *alg; int i; int rc = 0; for (i = 0; i < array_size; i++) { alg = kzalloc(sizeof(struct crypto4xx_alg), GFP_KERNEL); if (!alg) return -ENOMEM; alg->alg = crypto_alg[i]; alg->dev = sec_dev; switch (alg->alg.type) { case CRYPTO_ALG_TYPE_AHASH: rc = crypto_register_ahash(&alg->alg.u.hash); break; default: rc = crypto_register_alg(&alg->alg.u.cipher); break; } if (rc) kfree(alg); else list_add_tail(&alg->entry, &sec_dev->alg_list); } return 0; } static void crypto4xx_unregister_alg(struct crypto4xx_device *sec_dev) { struct crypto4xx_alg *alg, *tmp; list_for_each_entry_safe(alg, tmp, &sec_dev->alg_list, entry) { list_del(&alg->entry); switch (alg->alg.type) { case CRYPTO_ALG_TYPE_AHASH: crypto_unregister_ahash(&alg->alg.u.hash); break; default: crypto_unregister_alg(&alg->alg.u.cipher); } kfree(alg); } } static void crypto4xx_bh_tasklet_cb(unsigned long data) { struct device *dev = (struct device *)data; struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); struct pd_uinfo *pd_uinfo; struct ce_pd *pd; u32 tail; while (core_dev->dev->pdr_head != core_dev->dev->pdr_tail) { tail = core_dev->dev->pdr_tail; pd_uinfo = &core_dev->dev->pdr_uinfo[tail]; pd = &core_dev->dev->pdr[tail]; if ((pd_uinfo->state & PD_ENTRY_INUSE) && pd->pd_ctl.bf.pe_done && !pd->pd_ctl.bf.host_ready) { pd->pd_ctl.bf.pe_done = 0; crypto4xx_pd_done(core_dev->dev, tail); crypto4xx_put_pd_to_pdr(core_dev->dev, tail); } else { /* if tail not done, break */ break; } } } /** * Top Half of isr. */ static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data) { struct device *dev = (struct device *)data; struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); if (!core_dev->dev->ce_base) return 0; writel(PPC4XX_INTERRUPT_CLR, core_dev->dev->ce_base + CRYPTO4XX_INT_CLR); tasklet_schedule(&core_dev->tasklet); return IRQ_HANDLED; } /** * Supported Crypto Algorithms */ struct crypto4xx_alg_common crypto4xx_alg[] = { /* Crypto AES modes */ { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = { .cra_name = "cbc(aes)", .cra_driver_name = "cbc-aes-ppc4xx", .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct crypto4xx_ctx), .cra_type = &crypto_ablkcipher_type, .cra_init = crypto4xx_alg_init, .cra_exit = crypto4xx_alg_exit, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_cbc, .encrypt = crypto4xx_encrypt, .decrypt = crypto4xx_decrypt, } } }}, { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = { .cra_name = "cfb(aes)", .cra_driver_name = "cfb-aes-ppc4xx", .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct crypto4xx_ctx), .cra_type = &crypto_ablkcipher_type, .cra_init = crypto4xx_alg_init, .cra_exit = crypto4xx_alg_exit, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_cfb, .encrypt = crypto4xx_encrypt, .decrypt = crypto4xx_decrypt, } } } }, { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = { .cra_name = "rfc3686(ctr(aes))", .cra_driver_name = "rfc3686-ctr-aes-ppc4xx", .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct crypto4xx_ctx), .cra_type = &crypto_ablkcipher_type, .cra_init = crypto4xx_alg_init, .cra_exit = crypto4xx_alg_exit, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, .ivsize = CTR_RFC3686_IV_SIZE, .setkey = crypto4xx_setkey_rfc3686, .encrypt = crypto4xx_rfc3686_encrypt, .decrypt = crypto4xx_rfc3686_decrypt, } } } }, { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = { .cra_name = "ecb(aes)", .cra_driver_name = "ecb-aes-ppc4xx", .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct crypto4xx_ctx), .cra_type = &crypto_ablkcipher_type, .cra_init = crypto4xx_alg_init, .cra_exit = crypto4xx_alg_exit, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .setkey = crypto4xx_setkey_aes_ecb, .encrypt = crypto4xx_encrypt, .decrypt = crypto4xx_decrypt, } } } }, { .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = { .cra_name = "ofb(aes)", .cra_driver_name = "ofb-aes-ppc4xx", .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY, .cra_blocksize = AES_BLOCK_SIZE, .cra_ctxsize = sizeof(struct crypto4xx_ctx), .cra_type = &crypto_ablkcipher_type, .cra_init = crypto4xx_alg_init, .cra_exit = crypto4xx_alg_exit, .cra_module = THIS_MODULE, .cra_u = { .ablkcipher = { .min_keysize = AES_MIN_KEY_SIZE, .max_keysize = AES_MAX_KEY_SIZE, .ivsize = AES_IV_SIZE, .setkey = crypto4xx_setkey_aes_ofb, .encrypt = crypto4xx_encrypt, .decrypt = crypto4xx_decrypt, } } } }, }; /** * Module Initialization Routine */ static int crypto4xx_probe(struct platform_device *ofdev) { int rc; struct resource res; struct device *dev = &ofdev->dev; struct crypto4xx_core_device *core_dev; rc = of_address_to_resource(ofdev->dev.of_node, 0, &res); if (rc) return -ENODEV; if (of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-crypto")) { mtdcri(SDR0, PPC460EX_SDR0_SRST, mfdcri(SDR0, PPC460EX_SDR0_SRST) | PPC460EX_CE_RESET); mtdcri(SDR0, PPC460EX_SDR0_SRST, mfdcri(SDR0, PPC460EX_SDR0_SRST) & ~PPC460EX_CE_RESET); } else if (of_find_compatible_node(NULL, NULL, "amcc,ppc405ex-crypto")) { mtdcri(SDR0, PPC405EX_SDR0_SRST, mfdcri(SDR0, PPC405EX_SDR0_SRST) | PPC405EX_CE_RESET); mtdcri(SDR0, PPC405EX_SDR0_SRST, mfdcri(SDR0, PPC405EX_SDR0_SRST) & ~PPC405EX_CE_RESET); } else if (of_find_compatible_node(NULL, NULL, "amcc,ppc460sx-crypto")) { mtdcri(SDR0, PPC460SX_SDR0_SRST, mfdcri(SDR0, PPC460SX_SDR0_SRST) | PPC460SX_CE_RESET); mtdcri(SDR0, PPC460SX_SDR0_SRST, mfdcri(SDR0, PPC460SX_SDR0_SRST) & ~PPC460SX_CE_RESET); } else { printk(KERN_ERR "Crypto Function Not supported!\n"); return -EINVAL; } core_dev = kzalloc(sizeof(struct crypto4xx_core_device), GFP_KERNEL); if (!core_dev) return -ENOMEM; dev_set_drvdata(dev, core_dev); core_dev->ofdev = ofdev; core_dev->dev = kzalloc(sizeof(struct crypto4xx_device), GFP_KERNEL); rc = -ENOMEM; if (!core_dev->dev) goto err_alloc_dev; core_dev->dev->core_dev = core_dev; core_dev->device = dev; spin_lock_init(&core_dev->lock); INIT_LIST_HEAD(&core_dev->dev->alg_list); rc = crypto4xx_build_pdr(core_dev->dev); if (rc) goto err_build_pdr; rc = crypto4xx_build_gdr(core_dev->dev); if (rc) goto err_build_pdr; rc = crypto4xx_build_sdr(core_dev->dev); if (rc) goto err_build_sdr; /* Init tasklet for bottom half processing */ tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb, (unsigned long) dev); /* Register for Crypto isr, Crypto Engine IRQ */ core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0, core_dev->dev->name, dev); if (rc) goto err_request_irq; core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0); if (!core_dev->dev->ce_base) { dev_err(dev, "failed to of_iomap\n"); rc = -ENOMEM; goto err_iomap; } /* need to setup pdr, rdr, gdr and sdr before this */ crypto4xx_hw_init(core_dev->dev); /* Register security algorithms with Linux CryptoAPI */ rc = crypto4xx_register_alg(core_dev->dev, crypto4xx_alg, ARRAY_SIZE(crypto4xx_alg)); if (rc) goto err_start_dev; ppc4xx_trng_probe(core_dev); return 0; err_start_dev: iounmap(core_dev->dev->ce_base); err_iomap: free_irq(core_dev->irq, dev); err_request_irq: irq_dispose_mapping(core_dev->irq); tasklet_kill(&core_dev->tasklet); err_build_sdr: crypto4xx_destroy_sdr(core_dev->dev); crypto4xx_destroy_gdr(core_dev->dev); err_build_pdr: crypto4xx_destroy_pdr(core_dev->dev); kfree(core_dev->dev); err_alloc_dev: kfree(core_dev); return rc; } static int crypto4xx_remove(struct platform_device *ofdev) { struct device *dev = &ofdev->dev; struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); ppc4xx_trng_remove(core_dev); free_irq(core_dev->irq, dev); irq_dispose_mapping(core_dev->irq); tasklet_kill(&core_dev->tasklet); /* Un-register with Linux CryptoAPI */ crypto4xx_unregister_alg(core_dev->dev); /* Free all allocated memory */ crypto4xx_stop_all(core_dev); return 0; } static const struct of_device_id crypto4xx_match[] = { { .compatible = "amcc,ppc4xx-crypto",}, { }, }; MODULE_DEVICE_TABLE(of, crypto4xx_match); static struct platform_driver crypto4xx_driver = { .driver = { .name = MODULE_NAME, .of_match_table = crypto4xx_match, }, .probe = crypto4xx_probe, .remove = crypto4xx_remove, }; module_platform_driver(crypto4xx_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("James Hsiao "); MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator");