[PATCH 2/5] ARM: mxs: crypto: Remove the old DCP driver
Shawn Guo
shawn.guo at linaro.org
Tue Dec 3 06:07:33 EST 2013
On Sun, Dec 01, 2013 at 10:20:20PM +0100, Marek Vasut wrote:
> Remove the old DCP driver as it had multiple severe issues. The driver
> will be replaced by a more robust implementation. Here is a short list
> of problems with this driver:
>
> 1) It only supports AES_CBC
> 2) The driver was apparently never ran behind anyone working with MXS. ie.:
> -> Restarting the DCP block is not done via mxs_reset_block()
> -> The DT name is not "fsl,dcp" or "fsl,mxs-dcp" as other MXS drivers
> 3) Introduces new ad-hoc IOCTLs
> 4) The IRQ handler can't use usual completion() in the driver because that'd
> trigger "scheduling while atomic" oops, yes?
>
> Signed-off-by: Marek Vasut <marex at denx.de>
Please drop "ARM: mxs: " from patch subject, since it's not a patch
touching arch/arm/mach-mxs anyhow. It's there confusing people.
Shawn
> Cc: Herbert Xu <herbert at gondor.apana.org.au>
> Cc: David S. Miller <davem at davemloft.net>
> Cc: Fabio Estevam <fabio.estevam at freescale.com>
> Cc: Shawn Guo <shawn.guo at linaro.org>
> Cc: linux-crypto at vger.kernel.org
> ---
> drivers/crypto/Kconfig | 10 -
> drivers/crypto/Makefile | 1 -
> drivers/crypto/dcp.c | 903 ------------------------------------------------
> 3 files changed, 914 deletions(-)
> delete mode 100644 drivers/crypto/dcp.c
>
> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> index f4fd837..776d308 100644
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -289,16 +289,6 @@ config CRYPTO_DEV_SAHARA
> This option enables support for the SAHARA HW crypto accelerator
> found in some Freescale i.MX chips.
>
> -config CRYPTO_DEV_DCP
> - tristate "Support for the DCP engine"
> - depends on ARCH_MXS && OF
> - select CRYPTO_BLKCIPHER
> - select CRYPTO_AES
> - select CRYPTO_CBC
> - help
> - This options enables support for the hardware crypto-acceleration
> - capabilities of the DCP co-processor
> -
> config CRYPTO_DEV_S5P
> tristate "Support for Samsung S5PV210 crypto accelerator"
> depends on ARCH_S5PV210
> diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
> index b4946dd..38ce13d 100644
> --- a/drivers/crypto/Makefile
> +++ b/drivers/crypto/Makefile
> @@ -13,7 +13,6 @@ obj-$(CONFIG_CRYPTO_DEV_OMAP_SHAM) += omap-sham.o
> obj-$(CONFIG_CRYPTO_DEV_OMAP_AES) += omap-aes.o
> obj-$(CONFIG_CRYPTO_DEV_PICOXCELL) += picoxcell_crypto.o
> obj-$(CONFIG_CRYPTO_DEV_SAHARA) += sahara.o
> -obj-$(CONFIG_CRYPTO_DEV_DCP) += dcp.o
> obj-$(CONFIG_CRYPTO_DEV_S5P) += s5p-sss.o
> obj-$(CONFIG_CRYPTO_DEV_TEGRA_AES) += tegra-aes.o
> obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/
> diff --git a/drivers/crypto/dcp.c b/drivers/crypto/dcp.c
> deleted file mode 100644
> index 247ab80..0000000
> --- a/drivers/crypto/dcp.c
> +++ /dev/null
> @@ -1,903 +0,0 @@
> -/*
> - * Cryptographic API.
> - *
> - * Support for DCP cryptographic accelerator.
> - *
> - * Copyright (c) 2013
> - * Author: Tobias Rauter <tobias.rauter at gmail.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.
> - *
> - * Based on tegra-aes.c, dcp.c (from freescale SDK) and sahara.c
> - */
> -#include <linux/module.h>
> -#include <linux/init.h>
> -#include <linux/errno.h>
> -#include <linux/kernel.h>
> -#include <linux/platform_device.h>
> -#include <linux/dma-mapping.h>
> -#include <linux/io.h>
> -#include <linux/mutex.h>
> -#include <linux/interrupt.h>
> -#include <linux/completion.h>
> -#include <linux/workqueue.h>
> -#include <linux/delay.h>
> -#include <linux/crypto.h>
> -#include <linux/miscdevice.h>
> -
> -#include <crypto/scatterwalk.h>
> -#include <crypto/aes.h>
> -
> -
> -/* IOCTL for DCP OTP Key AES - taken from Freescale's SDK*/
> -#define DBS_IOCTL_BASE 'd'
> -#define DBS_ENC _IOW(DBS_IOCTL_BASE, 0x00, uint8_t[16])
> -#define DBS_DEC _IOW(DBS_IOCTL_BASE, 0x01, uint8_t[16])
> -
> -/* DCP channel used for AES */
> -#define USED_CHANNEL 1
> -/* Ring Buffers' maximum size */
> -#define DCP_MAX_PKG 20
> -
> -/* Control Register */
> -#define DCP_REG_CTRL 0x000
> -#define DCP_CTRL_SFRST (1<<31)
> -#define DCP_CTRL_CLKGATE (1<<30)
> -#define DCP_CTRL_CRYPTO_PRESENT (1<<29)
> -#define DCP_CTRL_SHA_PRESENT (1<<28)
> -#define DCP_CTRL_GATHER_RES_WRITE (1<<23)
> -#define DCP_CTRL_ENABLE_CONTEXT_CACHE (1<<22)
> -#define DCP_CTRL_ENABLE_CONTEXT_SWITCH (1<<21)
> -#define DCP_CTRL_CH_IRQ_E_0 0x01
> -#define DCP_CTRL_CH_IRQ_E_1 0x02
> -#define DCP_CTRL_CH_IRQ_E_2 0x04
> -#define DCP_CTRL_CH_IRQ_E_3 0x08
> -
> -/* Status register */
> -#define DCP_REG_STAT 0x010
> -#define DCP_STAT_OTP_KEY_READY (1<<28)
> -#define DCP_STAT_CUR_CHANNEL(stat) ((stat>>24)&0x0F)
> -#define DCP_STAT_READY_CHANNEL(stat) ((stat>>16)&0x0F)
> -#define DCP_STAT_IRQ(stat) (stat&0x0F)
> -#define DCP_STAT_CHAN_0 (0x01)
> -#define DCP_STAT_CHAN_1 (0x02)
> -#define DCP_STAT_CHAN_2 (0x04)
> -#define DCP_STAT_CHAN_3 (0x08)
> -
> -/* Channel Control Register */
> -#define DCP_REG_CHAN_CTRL 0x020
> -#define DCP_CHAN_CTRL_CH0_IRQ_MERGED (1<<16)
> -#define DCP_CHAN_CTRL_HIGH_PRIO_0 (0x0100)
> -#define DCP_CHAN_CTRL_HIGH_PRIO_1 (0x0200)
> -#define DCP_CHAN_CTRL_HIGH_PRIO_2 (0x0400)
> -#define DCP_CHAN_CTRL_HIGH_PRIO_3 (0x0800)
> -#define DCP_CHAN_CTRL_ENABLE_0 (0x01)
> -#define DCP_CHAN_CTRL_ENABLE_1 (0x02)
> -#define DCP_CHAN_CTRL_ENABLE_2 (0x04)
> -#define DCP_CHAN_CTRL_ENABLE_3 (0x08)
> -
> -/*
> - * Channel Registers:
> - * The DCP has 4 channels. Each of this channels
> - * has 4 registers (command pointer, semaphore, status and options).
> - * The address of register REG of channel CHAN is obtained by
> - * dcp_chan_reg(REG, CHAN)
> - */
> -#define DCP_REG_CHAN_PTR 0x00000100
> -#define DCP_REG_CHAN_SEMA 0x00000110
> -#define DCP_REG_CHAN_STAT 0x00000120
> -#define DCP_REG_CHAN_OPT 0x00000130
> -
> -#define DCP_CHAN_STAT_NEXT_CHAIN_IS_0 0x010000
> -#define DCP_CHAN_STAT_NO_CHAIN 0x020000
> -#define DCP_CHAN_STAT_CONTEXT_ERROR 0x030000
> -#define DCP_CHAN_STAT_PAYLOAD_ERROR 0x040000
> -#define DCP_CHAN_STAT_INVALID_MODE 0x050000
> -#define DCP_CHAN_STAT_PAGEFAULT 0x40
> -#define DCP_CHAN_STAT_DST 0x20
> -#define DCP_CHAN_STAT_SRC 0x10
> -#define DCP_CHAN_STAT_PACKET 0x08
> -#define DCP_CHAN_STAT_SETUP 0x04
> -#define DCP_CHAN_STAT_MISMATCH 0x02
> -
> -/* hw packet control*/
> -
> -#define DCP_PKT_PAYLOAD_KEY (1<<11)
> -#define DCP_PKT_OTP_KEY (1<<10)
> -#define DCP_PKT_CIPHER_INIT (1<<9)
> -#define DCP_PKG_CIPHER_ENCRYPT (1<<8)
> -#define DCP_PKT_CIPHER_ENABLE (1<<5)
> -#define DCP_PKT_DECR_SEM (1<<1)
> -#define DCP_PKT_CHAIN (1<<2)
> -#define DCP_PKT_IRQ 1
> -
> -#define DCP_PKT_MODE_CBC (1<<4)
> -#define DCP_PKT_KEYSELECT_OTP (0xFF<<8)
> -
> -/* cipher flags */
> -#define DCP_ENC 0x0001
> -#define DCP_DEC 0x0002
> -#define DCP_ECB 0x0004
> -#define DCP_CBC 0x0008
> -#define DCP_CBC_INIT 0x0010
> -#define DCP_NEW_KEY 0x0040
> -#define DCP_OTP_KEY 0x0080
> -#define DCP_AES 0x1000
> -
> -/* DCP Flags */
> -#define DCP_FLAG_BUSY 0x01
> -#define DCP_FLAG_PRODUCING 0x02
> -
> -/* clock defines */
> -#define CLOCK_ON 1
> -#define CLOCK_OFF 0
> -
> -struct dcp_dev_req_ctx {
> - int mode;
> -};
> -
> -struct dcp_op {
> - unsigned int flags;
> - u8 key[AES_KEYSIZE_128];
> - int keylen;
> -
> - struct ablkcipher_request *req;
> - struct crypto_ablkcipher *fallback;
> -
> - uint32_t stat;
> - uint32_t pkt1;
> - uint32_t pkt2;
> - struct ablkcipher_walk walk;
> -};
> -
> -struct dcp_dev {
> - struct device *dev;
> - void __iomem *dcp_regs_base;
> -
> - int dcp_vmi_irq;
> - int dcp_irq;
> -
> - spinlock_t queue_lock;
> - struct crypto_queue queue;
> -
> - uint32_t pkt_produced;
> - uint32_t pkt_consumed;
> -
> - struct dcp_hw_packet *hw_pkg[DCP_MAX_PKG];
> - dma_addr_t hw_phys_pkg;
> -
> - /* [KEY][IV] Both with 16 Bytes */
> - u8 *payload_base;
> - dma_addr_t payload_base_dma;
> -
> -
> - struct tasklet_struct done_task;
> - struct tasklet_struct queue_task;
> - struct timer_list watchdog;
> -
> - unsigned long flags;
> -
> - struct dcp_op *ctx;
> -
> - struct miscdevice dcp_bootstream_misc;
> -};
> -
> -struct dcp_hw_packet {
> - uint32_t next;
> - uint32_t pkt1;
> - uint32_t pkt2;
> - uint32_t src;
> - uint32_t dst;
> - uint32_t size;
> - uint32_t payload;
> - uint32_t stat;
> -};
> -
> -static struct dcp_dev *global_dev;
> -
> -static inline u32 dcp_chan_reg(u32 reg, int chan)
> -{
> - return reg + (chan) * 0x40;
> -}
> -
> -static inline void dcp_write(struct dcp_dev *dev, u32 data, u32 reg)
> -{
> - writel(data, dev->dcp_regs_base + reg);
> -}
> -
> -static inline void dcp_set(struct dcp_dev *dev, u32 data, u32 reg)
> -{
> - writel(data, dev->dcp_regs_base + (reg | 0x04));
> -}
> -
> -static inline void dcp_clear(struct dcp_dev *dev, u32 data, u32 reg)
> -{
> - writel(data, dev->dcp_regs_base + (reg | 0x08));
> -}
> -
> -static inline void dcp_toggle(struct dcp_dev *dev, u32 data, u32 reg)
> -{
> - writel(data, dev->dcp_regs_base + (reg | 0x0C));
> -}
> -
> -static inline unsigned int dcp_read(struct dcp_dev *dev, u32 reg)
> -{
> - return readl(dev->dcp_regs_base + reg);
> -}
> -
> -static void dcp_dma_unmap(struct dcp_dev *dev, struct dcp_hw_packet *pkt)
> -{
> - dma_unmap_page(dev->dev, pkt->src, pkt->size, DMA_TO_DEVICE);
> - dma_unmap_page(dev->dev, pkt->dst, pkt->size, DMA_FROM_DEVICE);
> - dev_dbg(dev->dev, "unmap packet %x", (unsigned int) pkt);
> -}
> -
> -static int dcp_dma_map(struct dcp_dev *dev,
> - struct ablkcipher_walk *walk, struct dcp_hw_packet *pkt)
> -{
> - dev_dbg(dev->dev, "map packet %x", (unsigned int) pkt);
> - /* align to length = 16 */
> - pkt->size = walk->nbytes - (walk->nbytes % 16);
> -
> - pkt->src = dma_map_page(dev->dev, walk->src.page, walk->src.offset,
> - pkt->size, DMA_TO_DEVICE);
> -
> - if (pkt->src == 0) {
> - dev_err(dev->dev, "Unable to map src");
> - return -ENOMEM;
> - }
> -
> - pkt->dst = dma_map_page(dev->dev, walk->dst.page, walk->dst.offset,
> - pkt->size, DMA_FROM_DEVICE);
> -
> - if (pkt->dst == 0) {
> - dev_err(dev->dev, "Unable to map dst");
> - dma_unmap_page(dev->dev, pkt->src, pkt->size, DMA_TO_DEVICE);
> - return -ENOMEM;
> - }
> -
> - return 0;
> -}
> -
> -static void dcp_op_one(struct dcp_dev *dev, struct dcp_hw_packet *pkt,
> - uint8_t last)
> -{
> - struct dcp_op *ctx = dev->ctx;
> - pkt->pkt1 = ctx->pkt1;
> - pkt->pkt2 = ctx->pkt2;
> -
> - pkt->payload = (u32) dev->payload_base_dma;
> - pkt->stat = 0;
> -
> - if (ctx->flags & DCP_CBC_INIT) {
> - pkt->pkt1 |= DCP_PKT_CIPHER_INIT;
> - ctx->flags &= ~DCP_CBC_INIT;
> - }
> -
> - mod_timer(&dev->watchdog, jiffies + msecs_to_jiffies(500));
> - pkt->pkt1 |= DCP_PKT_IRQ;
> - if (!last)
> - pkt->pkt1 |= DCP_PKT_CHAIN;
> -
> - dev->pkt_produced++;
> -
> - dcp_write(dev, 1,
> - dcp_chan_reg(DCP_REG_CHAN_SEMA, USED_CHANNEL));
> -}
> -
> -static void dcp_op_proceed(struct dcp_dev *dev)
> -{
> - struct dcp_op *ctx = dev->ctx;
> - struct dcp_hw_packet *pkt;
> -
> - while (ctx->walk.nbytes) {
> - int err = 0;
> -
> - pkt = dev->hw_pkg[dev->pkt_produced % DCP_MAX_PKG];
> - err = dcp_dma_map(dev, &ctx->walk, pkt);
> - if (err) {
> - dev->ctx->stat |= err;
> - /* start timer to wait for already set up calls */
> - mod_timer(&dev->watchdog,
> - jiffies + msecs_to_jiffies(500));
> - break;
> - }
> -
> -
> - err = ctx->walk.nbytes - pkt->size;
> - ablkcipher_walk_done(dev->ctx->req, &dev->ctx->walk, err);
> -
> - dcp_op_one(dev, pkt, ctx->walk.nbytes == 0);
> - /* we have to wait if no space is left in buffer */
> - if (dev->pkt_produced - dev->pkt_consumed == DCP_MAX_PKG)
> - break;
> - }
> - clear_bit(DCP_FLAG_PRODUCING, &dev->flags);
> -}
> -
> -static void dcp_op_start(struct dcp_dev *dev, uint8_t use_walk)
> -{
> - struct dcp_op *ctx = dev->ctx;
> -
> - if (ctx->flags & DCP_NEW_KEY) {
> - memcpy(dev->payload_base, ctx->key, ctx->keylen);
> - ctx->flags &= ~DCP_NEW_KEY;
> - }
> -
> - ctx->pkt1 = 0;
> - ctx->pkt1 |= DCP_PKT_CIPHER_ENABLE;
> - ctx->pkt1 |= DCP_PKT_DECR_SEM;
> -
> - if (ctx->flags & DCP_OTP_KEY)
> - ctx->pkt1 |= DCP_PKT_OTP_KEY;
> - else
> - ctx->pkt1 |= DCP_PKT_PAYLOAD_KEY;
> -
> - if (ctx->flags & DCP_ENC)
> - ctx->pkt1 |= DCP_PKG_CIPHER_ENCRYPT;
> -
> - ctx->pkt2 = 0;
> - if (ctx->flags & DCP_CBC)
> - ctx->pkt2 |= DCP_PKT_MODE_CBC;
> -
> - dev->pkt_produced = 0;
> - dev->pkt_consumed = 0;
> -
> - ctx->stat = 0;
> - dcp_clear(dev, -1, dcp_chan_reg(DCP_REG_CHAN_STAT, USED_CHANNEL));
> - dcp_write(dev, (u32) dev->hw_phys_pkg,
> - dcp_chan_reg(DCP_REG_CHAN_PTR, USED_CHANNEL));
> -
> - set_bit(DCP_FLAG_PRODUCING, &dev->flags);
> -
> - if (use_walk) {
> - ablkcipher_walk_init(&ctx->walk, ctx->req->dst,
> - ctx->req->src, ctx->req->nbytes);
> - ablkcipher_walk_phys(ctx->req, &ctx->walk);
> - dcp_op_proceed(dev);
> - } else {
> - dcp_op_one(dev, dev->hw_pkg[0], 1);
> - clear_bit(DCP_FLAG_PRODUCING, &dev->flags);
> - }
> -}
> -
> -static void dcp_done_task(unsigned long data)
> -{
> - struct dcp_dev *dev = (struct dcp_dev *)data;
> - struct dcp_hw_packet *last_packet;
> - int fin;
> - fin = 0;
> -
> - for (last_packet = dev->hw_pkg[(dev->pkt_consumed) % DCP_MAX_PKG];
> - last_packet->stat == 1;
> - last_packet =
> - dev->hw_pkg[++(dev->pkt_consumed) % DCP_MAX_PKG]) {
> -
> - dcp_dma_unmap(dev, last_packet);
> - last_packet->stat = 0;
> - fin++;
> - }
> - /* the last call of this function already consumed this IRQ's packet */
> - if (fin == 0)
> - return;
> -
> - dev_dbg(dev->dev,
> - "Packet(s) done with status %x; finished: %d, produced:%d, complete consumed: %d",
> - dev->ctx->stat, fin, dev->pkt_produced, dev->pkt_consumed);
> -
> - last_packet = dev->hw_pkg[(dev->pkt_consumed - 1) % DCP_MAX_PKG];
> - if (!dev->ctx->stat && last_packet->pkt1 & DCP_PKT_CHAIN) {
> - if (!test_and_set_bit(DCP_FLAG_PRODUCING, &dev->flags))
> - dcp_op_proceed(dev);
> - return;
> - }
> -
> - while (unlikely(dev->pkt_consumed < dev->pkt_produced)) {
> - dcp_dma_unmap(dev,
> - dev->hw_pkg[dev->pkt_consumed++ % DCP_MAX_PKG]);
> - }
> -
> - if (dev->ctx->flags & DCP_OTP_KEY) {
> - /* we used the miscdevice, no walk to finish */
> - clear_bit(DCP_FLAG_BUSY, &dev->flags);
> - return;
> - }
> -
> - ablkcipher_walk_complete(&dev->ctx->walk);
> - dev->ctx->req->base.complete(&dev->ctx->req->base,
> - dev->ctx->stat);
> - dev->ctx->req = NULL;
> - /* in case there are other requests in the queue */
> - tasklet_schedule(&dev->queue_task);
> -}
> -
> -static void dcp_watchdog(unsigned long data)
> -{
> - struct dcp_dev *dev = (struct dcp_dev *)data;
> - dev->ctx->stat |= dcp_read(dev,
> - dcp_chan_reg(DCP_REG_CHAN_STAT, USED_CHANNEL));
> -
> - dev_err(dev->dev, "Timeout, Channel status: %x", dev->ctx->stat);
> -
> - if (!dev->ctx->stat)
> - dev->ctx->stat = -ETIMEDOUT;
> -
> - dcp_done_task(data);
> -}
> -
> -
> -static irqreturn_t dcp_common_irq(int irq, void *context)
> -{
> - u32 msk;
> - struct dcp_dev *dev = (struct dcp_dev *) context;
> -
> - del_timer(&dev->watchdog);
> -
> - msk = DCP_STAT_IRQ(dcp_read(dev, DCP_REG_STAT));
> - dcp_clear(dev, msk, DCP_REG_STAT);
> - if (msk == 0)
> - return IRQ_NONE;
> -
> - dev->ctx->stat |= dcp_read(dev,
> - dcp_chan_reg(DCP_REG_CHAN_STAT, USED_CHANNEL));
> -
> - if (msk & DCP_STAT_CHAN_1)
> - tasklet_schedule(&dev->done_task);
> -
> - return IRQ_HANDLED;
> -}
> -
> -static irqreturn_t dcp_vmi_irq(int irq, void *context)
> -{
> - return dcp_common_irq(irq, context);
> -}
> -
> -static irqreturn_t dcp_irq(int irq, void *context)
> -{
> - return dcp_common_irq(irq, context);
> -}
> -
> -static void dcp_crypt(struct dcp_dev *dev, struct dcp_op *ctx)
> -{
> - dev->ctx = ctx;
> -
> - if ((ctx->flags & DCP_CBC) && ctx->req->info) {
> - ctx->flags |= DCP_CBC_INIT;
> - memcpy(dev->payload_base + AES_KEYSIZE_128,
> - ctx->req->info, AES_KEYSIZE_128);
> - }
> -
> - dcp_op_start(dev, 1);
> -}
> -
> -static void dcp_queue_task(unsigned long data)
> -{
> - struct dcp_dev *dev = (struct dcp_dev *) data;
> - struct crypto_async_request *async_req, *backlog;
> - struct crypto_ablkcipher *tfm;
> - struct dcp_op *ctx;
> - struct dcp_dev_req_ctx *rctx;
> - struct ablkcipher_request *req;
> - unsigned long flags;
> -
> - spin_lock_irqsave(&dev->queue_lock, flags);
> -
> - backlog = crypto_get_backlog(&dev->queue);
> - async_req = crypto_dequeue_request(&dev->queue);
> -
> - spin_unlock_irqrestore(&dev->queue_lock, flags);
> -
> - if (!async_req)
> - goto ret_nothing_done;
> -
> - if (backlog)
> - backlog->complete(backlog, -EINPROGRESS);
> -
> - req = ablkcipher_request_cast(async_req);
> - tfm = crypto_ablkcipher_reqtfm(req);
> - rctx = ablkcipher_request_ctx(req);
> - ctx = crypto_ablkcipher_ctx(tfm);
> -
> - if (!req->src || !req->dst)
> - goto ret_nothing_done;
> -
> - ctx->flags |= rctx->mode;
> - ctx->req = req;
> -
> - dcp_crypt(dev, ctx);
> -
> - return;
> -
> -ret_nothing_done:
> - clear_bit(DCP_FLAG_BUSY, &dev->flags);
> -}
> -
> -
> -static int dcp_cra_init(struct crypto_tfm *tfm)
> -{
> - const char *name = tfm->__crt_alg->cra_name;
> - struct dcp_op *ctx = crypto_tfm_ctx(tfm);
> -
> - tfm->crt_ablkcipher.reqsize = sizeof(struct dcp_dev_req_ctx);
> -
> - ctx->fallback = crypto_alloc_ablkcipher(name, 0,
> - CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
> -
> - if (IS_ERR(ctx->fallback)) {
> - dev_err(global_dev->dev, "Error allocating fallback algo %s\n",
> - name);
> - return PTR_ERR(ctx->fallback);
> - }
> -
> - return 0;
> -}
> -
> -static void dcp_cra_exit(struct crypto_tfm *tfm)
> -{
> - struct dcp_op *ctx = crypto_tfm_ctx(tfm);
> -
> - if (ctx->fallback)
> - crypto_free_ablkcipher(ctx->fallback);
> -
> - ctx->fallback = NULL;
> -}
> -
> -/* async interface */
> -static int dcp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
> - unsigned int len)
> -{
> - struct dcp_op *ctx = crypto_ablkcipher_ctx(tfm);
> - unsigned int ret = 0;
> - ctx->keylen = len;
> - ctx->flags = 0;
> - if (len == AES_KEYSIZE_128) {
> - if (memcmp(ctx->key, key, AES_KEYSIZE_128)) {
> - memcpy(ctx->key, key, len);
> - ctx->flags |= DCP_NEW_KEY;
> - }
> - return 0;
> - }
> -
> - ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
> - ctx->fallback->base.crt_flags |=
> - (tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
> -
> - ret = crypto_ablkcipher_setkey(ctx->fallback, key, len);
> - if (ret) {
> - struct crypto_tfm *tfm_aux = crypto_ablkcipher_tfm(tfm);
> -
> - tfm_aux->crt_flags &= ~CRYPTO_TFM_RES_MASK;
> - tfm_aux->crt_flags |=
> - (ctx->fallback->base.crt_flags & CRYPTO_TFM_RES_MASK);
> - }
> - return ret;
> -}
> -
> -static int dcp_aes_cbc_crypt(struct ablkcipher_request *req, int mode)
> -{
> - struct dcp_dev_req_ctx *rctx = ablkcipher_request_ctx(req);
> - struct dcp_dev *dev = global_dev;
> - unsigned long flags;
> - int err = 0;
> -
> - if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE))
> - return -EINVAL;
> -
> - rctx->mode = mode;
> -
> - spin_lock_irqsave(&dev->queue_lock, flags);
> - err = ablkcipher_enqueue_request(&dev->queue, req);
> - spin_unlock_irqrestore(&dev->queue_lock, flags);
> -
> - flags = test_and_set_bit(DCP_FLAG_BUSY, &dev->flags);
> -
> - if (!(flags & DCP_FLAG_BUSY))
> - tasklet_schedule(&dev->queue_task);
> -
> - return err;
> -}
> -
> -static int dcp_aes_cbc_encrypt(struct ablkcipher_request *req)
> -{
> - struct crypto_tfm *tfm =
> - crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
> - struct dcp_op *ctx = crypto_ablkcipher_ctx(
> - crypto_ablkcipher_reqtfm(req));
> -
> - if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
> - int err = 0;
> - ablkcipher_request_set_tfm(req, ctx->fallback);
> - err = crypto_ablkcipher_encrypt(req);
> - ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
> - return err;
> - }
> -
> - return dcp_aes_cbc_crypt(req, DCP_AES | DCP_ENC | DCP_CBC);
> -}
> -
> -static int dcp_aes_cbc_decrypt(struct ablkcipher_request *req)
> -{
> - struct crypto_tfm *tfm =
> - crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
> - struct dcp_op *ctx = crypto_ablkcipher_ctx(
> - crypto_ablkcipher_reqtfm(req));
> -
> - if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
> - int err = 0;
> - ablkcipher_request_set_tfm(req, ctx->fallback);
> - err = crypto_ablkcipher_decrypt(req);
> - ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
> - return err;
> - }
> - return dcp_aes_cbc_crypt(req, DCP_AES | DCP_DEC | DCP_CBC);
> -}
> -
> -static struct crypto_alg algs[] = {
> - {
> - .cra_name = "cbc(aes)",
> - .cra_driver_name = "dcp-cbc-aes",
> - .cra_alignmask = 3,
> - .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
> - CRYPTO_ALG_NEED_FALLBACK,
> - .cra_blocksize = AES_KEYSIZE_128,
> - .cra_type = &crypto_ablkcipher_type,
> - .cra_priority = 300,
> - .cra_u.ablkcipher = {
> - .min_keysize = AES_KEYSIZE_128,
> - .max_keysize = AES_KEYSIZE_128,
> - .setkey = dcp_aes_setkey,
> - .encrypt = dcp_aes_cbc_encrypt,
> - .decrypt = dcp_aes_cbc_decrypt,
> - .ivsize = AES_KEYSIZE_128,
> - }
> -
> - },
> -};
> -
> -/* DCP bootstream verification interface: uses OTP key for crypto */
> -static int dcp_bootstream_open(struct inode *inode, struct file *file)
> -{
> - file->private_data = container_of((file->private_data),
> - struct dcp_dev, dcp_bootstream_misc);
> - return 0;
> -}
> -
> -static long dcp_bootstream_ioctl(struct file *file,
> - unsigned int cmd, unsigned long arg)
> -{
> - struct dcp_dev *dev = (struct dcp_dev *) file->private_data;
> - void __user *argp = (void __user *)arg;
> - int ret;
> -
> - if (dev == NULL)
> - return -EBADF;
> -
> - if (cmd != DBS_ENC && cmd != DBS_DEC)
> - return -EINVAL;
> -
> - if (copy_from_user(dev->payload_base, argp, 16))
> - return -EFAULT;
> -
> - if (test_and_set_bit(DCP_FLAG_BUSY, &dev->flags))
> - return -EAGAIN;
> -
> - dev->ctx = kzalloc(sizeof(struct dcp_op), GFP_KERNEL);
> - if (!dev->ctx) {
> - dev_err(dev->dev,
> - "cannot allocate context for OTP crypto");
> - clear_bit(DCP_FLAG_BUSY, &dev->flags);
> - return -ENOMEM;
> - }
> -
> - dev->ctx->flags = DCP_AES | DCP_ECB | DCP_OTP_KEY | DCP_CBC_INIT;
> - dev->ctx->flags |= (cmd == DBS_ENC) ? DCP_ENC : DCP_DEC;
> - dev->hw_pkg[0]->src = dev->payload_base_dma;
> - dev->hw_pkg[0]->dst = dev->payload_base_dma;
> - dev->hw_pkg[0]->size = 16;
> -
> - dcp_op_start(dev, 0);
> -
> - while (test_bit(DCP_FLAG_BUSY, &dev->flags))
> - cpu_relax();
> -
> - ret = dev->ctx->stat;
> - if (!ret && copy_to_user(argp, dev->payload_base, 16))
> - ret = -EFAULT;
> -
> - kfree(dev->ctx);
> -
> - return ret;
> -}
> -
> -static const struct file_operations dcp_bootstream_fops = {
> - .owner = THIS_MODULE,
> - .unlocked_ioctl = dcp_bootstream_ioctl,
> - .open = dcp_bootstream_open,
> -};
> -
> -static int dcp_probe(struct platform_device *pdev)
> -{
> - struct dcp_dev *dev = NULL;
> - struct resource *r;
> - int i, ret, j;
> -
> - dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> - if (!dev)
> - return -ENOMEM;
> -
> - global_dev = dev;
> - dev->dev = &pdev->dev;
> -
> - platform_set_drvdata(pdev, dev);
> -
> - r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - dev->dcp_regs_base = devm_ioremap_resource(&pdev->dev, r);
> - if (IS_ERR(dev->dcp_regs_base))
> - return PTR_ERR(dev->dcp_regs_base);
> -
> - dcp_set(dev, DCP_CTRL_SFRST, DCP_REG_CTRL);
> - udelay(10);
> - dcp_clear(dev, DCP_CTRL_SFRST | DCP_CTRL_CLKGATE, DCP_REG_CTRL);
> -
> - dcp_write(dev, DCP_CTRL_GATHER_RES_WRITE |
> - DCP_CTRL_ENABLE_CONTEXT_CACHE | DCP_CTRL_CH_IRQ_E_1,
> - DCP_REG_CTRL);
> -
> - dcp_write(dev, DCP_CHAN_CTRL_ENABLE_1, DCP_REG_CHAN_CTRL);
> -
> - for (i = 0; i < 4; i++)
> - dcp_clear(dev, -1, dcp_chan_reg(DCP_REG_CHAN_STAT, i));
> -
> - dcp_clear(dev, -1, DCP_REG_STAT);
> -
> -
> - r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> - if (!r) {
> - dev_err(&pdev->dev, "can't get IRQ resource (0)\n");
> - return -EIO;
> - }
> - dev->dcp_vmi_irq = r->start;
> - ret = devm_request_irq(&pdev->dev, dev->dcp_vmi_irq, dcp_vmi_irq, 0,
> - "dcp", dev);
> - if (ret != 0) {
> - dev_err(&pdev->dev, "can't request_irq (0)\n");
> - return -EIO;
> - }
> -
> - r = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
> - if (!r) {
> - dev_err(&pdev->dev, "can't get IRQ resource (1)\n");
> - return -EIO;
> - }
> - dev->dcp_irq = r->start;
> - ret = devm_request_irq(&pdev->dev, dev->dcp_irq, dcp_irq, 0, "dcp",
> - dev);
> - if (ret != 0) {
> - dev_err(&pdev->dev, "can't request_irq (1)\n");
> - return -EIO;
> - }
> -
> - dev->hw_pkg[0] = dma_alloc_coherent(&pdev->dev,
> - DCP_MAX_PKG * sizeof(struct dcp_hw_packet),
> - &dev->hw_phys_pkg,
> - GFP_KERNEL);
> - if (!dev->hw_pkg[0]) {
> - dev_err(&pdev->dev, "Could not allocate hw descriptors\n");
> - return -ENOMEM;
> - }
> -
> - for (i = 1; i < DCP_MAX_PKG; i++) {
> - dev->hw_pkg[i - 1]->next = dev->hw_phys_pkg
> - + i * sizeof(struct dcp_hw_packet);
> - dev->hw_pkg[i] = dev->hw_pkg[i - 1] + 1;
> - }
> - dev->hw_pkg[i - 1]->next = dev->hw_phys_pkg;
> -
> -
> - dev->payload_base = dma_alloc_coherent(&pdev->dev, 2 * AES_KEYSIZE_128,
> - &dev->payload_base_dma, GFP_KERNEL);
> - if (!dev->payload_base) {
> - dev_err(&pdev->dev, "Could not allocate memory for key\n");
> - ret = -ENOMEM;
> - goto err_free_hw_packet;
> - }
> - tasklet_init(&dev->queue_task, dcp_queue_task,
> - (unsigned long) dev);
> - tasklet_init(&dev->done_task, dcp_done_task,
> - (unsigned long) dev);
> - spin_lock_init(&dev->queue_lock);
> -
> - crypto_init_queue(&dev->queue, 10);
> -
> - init_timer(&dev->watchdog);
> - dev->watchdog.function = &dcp_watchdog;
> - dev->watchdog.data = (unsigned long)dev;
> -
> - dev->dcp_bootstream_misc.minor = MISC_DYNAMIC_MINOR,
> - dev->dcp_bootstream_misc.name = "dcpboot",
> - dev->dcp_bootstream_misc.fops = &dcp_bootstream_fops,
> - ret = misc_register(&dev->dcp_bootstream_misc);
> - if (ret != 0) {
> - dev_err(dev->dev, "Unable to register misc device\n");
> - goto err_free_key_iv;
> - }
> -
> - for (i = 0; i < ARRAY_SIZE(algs); i++) {
> - algs[i].cra_priority = 300;
> - algs[i].cra_ctxsize = sizeof(struct dcp_op);
> - algs[i].cra_module = THIS_MODULE;
> - algs[i].cra_init = dcp_cra_init;
> - algs[i].cra_exit = dcp_cra_exit;
> - if (crypto_register_alg(&algs[i])) {
> - dev_err(&pdev->dev, "register algorithm failed\n");
> - ret = -ENOMEM;
> - goto err_unregister;
> - }
> - }
> - dev_notice(&pdev->dev, "DCP crypto enabled.!\n");
> -
> - return 0;
> -
> -err_unregister:
> - for (j = 0; j < i; j++)
> - crypto_unregister_alg(&algs[j]);
> -err_free_key_iv:
> - tasklet_kill(&dev->done_task);
> - tasklet_kill(&dev->queue_task);
> - dma_free_coherent(&pdev->dev, 2 * AES_KEYSIZE_128, dev->payload_base,
> - dev->payload_base_dma);
> -err_free_hw_packet:
> - dma_free_coherent(&pdev->dev, DCP_MAX_PKG *
> - sizeof(struct dcp_hw_packet), dev->hw_pkg[0],
> - dev->hw_phys_pkg);
> -
> - return ret;
> -}
> -
> -static int dcp_remove(struct platform_device *pdev)
> -{
> - struct dcp_dev *dev;
> - int j;
> - dev = platform_get_drvdata(pdev);
> -
> - misc_deregister(&dev->dcp_bootstream_misc);
> -
> - for (j = 0; j < ARRAY_SIZE(algs); j++)
> - crypto_unregister_alg(&algs[j]);
> -
> - tasklet_kill(&dev->done_task);
> - tasklet_kill(&dev->queue_task);
> -
> - dma_free_coherent(&pdev->dev, 2 * AES_KEYSIZE_128, dev->payload_base,
> - dev->payload_base_dma);
> -
> - dma_free_coherent(&pdev->dev,
> - DCP_MAX_PKG * sizeof(struct dcp_hw_packet),
> - dev->hw_pkg[0], dev->hw_phys_pkg);
> -
> - return 0;
> -}
> -
> -static struct of_device_id fs_dcp_of_match[] = {
> - { .compatible = "fsl-dcp"},
> - {},
> -};
> -
> -static struct platform_driver fs_dcp_driver = {
> - .probe = dcp_probe,
> - .remove = dcp_remove,
> - .driver = {
> - .name = "fsl-dcp",
> - .owner = THIS_MODULE,
> - .of_match_table = fs_dcp_of_match
> - }
> -};
> -
> -module_platform_driver(fs_dcp_driver);
> -
> -
> -MODULE_AUTHOR("Tobias Rauter <tobias.rauter at gmail.com>");
> -MODULE_DESCRIPTION("Freescale DCP Crypto Driver");
> -MODULE_LICENSE("GPL");
> --
> 1.8.4.2
>
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