--- /dev/null
+/*
+ * Copyright (C) 2016 Pengutronix, Steffen Trumtrar <kernel@pengutronix.de>
+ *
+ * The driver is based on information gathered from
+ * drivers/mxc/security/mxc_scc.c which can be found in
+ * the Freescale linux-2.6-imx.git in the imx_2.6.35_maintain branch.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ */
+#include <linux/clk.h>
+#include <linux/crypto.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include <crypto/algapi.h>
+#include <crypto/des.h>
+
+/* Secure Memory (SCM) registers */
+#define SCC_SCM_RED_START 0x0000
+#define SCC_SCM_BLACK_START 0x0004
+#define SCC_SCM_LENGTH 0x0008
+#define SCC_SCM_CTRL 0x000C
+#define SCC_SCM_STATUS 0x0010
+#define SCC_SCM_ERROR_STATUS 0x0014
+#define SCC_SCM_INTR_CTRL 0x0018
+#define SCC_SCM_CFG 0x001C
+#define SCC_SCM_INIT_VECTOR_0 0x0020
+#define SCC_SCM_INIT_VECTOR_1 0x0024
+#define SCC_SCM_RED_MEMORY 0x0400
+#define SCC_SCM_BLACK_MEMORY 0x0800
+
+/* Security Monitor (SMN) Registers */
+#define SCC_SMN_STATUS 0x1000
+#define SCC_SMN_COMMAND 0x1004
+#define SCC_SMN_SEQ_START 0x1008
+#define SCC_SMN_SEQ_END 0x100C
+#define SCC_SMN_SEQ_CHECK 0x1010
+#define SCC_SMN_BIT_COUNT 0x1014
+#define SCC_SMN_BITBANK_INC_SIZE 0x1018
+#define SCC_SMN_BITBANK_DECREMENT 0x101C
+#define SCC_SMN_COMPARE_SIZE 0x1020
+#define SCC_SMN_PLAINTEXT_CHECK 0x1024
+#define SCC_SMN_CIPHERTEXT_CHECK 0x1028
+#define SCC_SMN_TIMER_IV 0x102C
+#define SCC_SMN_TIMER_CONTROL 0x1030
+#define SCC_SMN_DEBUG_DETECT_STAT 0x1034
+#define SCC_SMN_TIMER 0x1038
+
+#define SCC_SCM_CTRL_START_CIPHER BIT(2)
+#define SCC_SCM_CTRL_CBC_MODE BIT(1)
+#define SCC_SCM_CTRL_DECRYPT_MODE BIT(0)
+
+#define SCC_SCM_STATUS_LEN_ERR BIT(12)
+#define SCC_SCM_STATUS_SMN_UNBLOCKED BIT(11)
+#define SCC_SCM_STATUS_CIPHERING_DONE BIT(10)
+#define SCC_SCM_STATUS_ZEROIZING_DONE BIT(9)
+#define SCC_SCM_STATUS_INTR_STATUS BIT(8)
+#define SCC_SCM_STATUS_SEC_KEY BIT(7)
+#define SCC_SCM_STATUS_INTERNAL_ERR BIT(6)
+#define SCC_SCM_STATUS_BAD_SEC_KEY BIT(5)
+#define SCC_SCM_STATUS_ZEROIZE_FAIL BIT(4)
+#define SCC_SCM_STATUS_SMN_BLOCKED BIT(3)
+#define SCC_SCM_STATUS_CIPHERING BIT(2)
+#define SCC_SCM_STATUS_ZEROIZING BIT(1)
+#define SCC_SCM_STATUS_BUSY BIT(0)
+
+#define SCC_SMN_STATUS_STATE_MASK 0x0000001F
+#define SCC_SMN_STATE_START 0x0
+/* The SMN is zeroizing its RAM during reset */
+#define SCC_SMN_STATE_ZEROIZE_RAM 0x5
+/* SMN has passed internal checks */
+#define SCC_SMN_STATE_HEALTH_CHECK 0x6
+/* Fatal Security Violation. SMN is locked, SCM is inoperative. */
+#define SCC_SMN_STATE_FAIL 0x9
+/* SCC is in secure state. SCM is using secret key. */
+#define SCC_SMN_STATE_SECURE 0xA
+/* SCC is not secure. SCM is using default key. */
+#define SCC_SMN_STATE_NON_SECURE 0xC
+
+#define SCC_SCM_INTR_CTRL_ZEROIZE_MEM BIT(2)
+#define SCC_SCM_INTR_CTRL_CLR_INTR BIT(1)
+#define SCC_SCM_INTR_CTRL_MASK_INTR BIT(0)
+
+/* Size, in blocks, of Red memory. */
+#define SCC_SCM_CFG_BLACK_SIZE_MASK 0x07fe0000
+#define SCC_SCM_CFG_BLACK_SIZE_SHIFT 17
+/* Size, in blocks, of Black memory. */
+#define SCC_SCM_CFG_RED_SIZE_MASK 0x0001ff80
+#define SCC_SCM_CFG_RED_SIZE_SHIFT 7
+/* Number of bytes per block. */
+#define SCC_SCM_CFG_BLOCK_SIZE_MASK 0x0000007f
+
+#define SCC_SMN_COMMAND_TAMPER_LOCK BIT(4)
+#define SCC_SMN_COMMAND_CLR_INTR BIT(3)
+#define SCC_SMN_COMMAND_CLR_BIT_BANK BIT(2)
+#define SCC_SMN_COMMAND_EN_INTR BIT(1)
+#define SCC_SMN_COMMAND_SET_SOFTWARE_ALARM BIT(0)
+
+#define SCC_KEY_SLOTS 20
+#define SCC_MAX_KEY_SIZE 32
+#define SCC_KEY_SLOT_SIZE 32
+
+#define SCC_CRC_CCITT_START 0xFFFF
+
+/*
+ * Offset into each RAM of the base of the area which is not
+ * used for Stored Keys.
+ */
+#define SCC_NON_RESERVED_OFFSET (SCC_KEY_SLOTS * SCC_KEY_SLOT_SIZE)
+
+/* Fixed padding for appending to plaintext to fill out a block */
+static char scc_block_padding[8] = { 0x80, 0, 0, 0, 0, 0, 0, 0 };
+
+enum mxc_scc_state {
+ SCC_STATE_OK,
+ SCC_STATE_UNIMPLEMENTED,
+ SCC_STATE_FAILED
+};
+
+struct mxc_scc {
+ struct device *dev;
+ void __iomem *base;
+ struct clk *clk;
+ bool hw_busy;
+ spinlock_t lock;
+ struct crypto_queue queue;
+ struct crypto_async_request *req;
+ int block_size_bytes;
+ int black_ram_size_blocks;
+ int memory_size_bytes;
+ int bytes_remaining;
+
+ void __iomem *red_memory;
+ void __iomem *black_memory;
+};
+
+struct mxc_scc_ctx {
+ struct mxc_scc *scc;
+ struct scatterlist *sg_src;
+ size_t src_nents;
+ struct scatterlist *sg_dst;
+ size_t dst_nents;
+ unsigned int offset;
+ unsigned int size;
+ unsigned int ctrl;
+};
+
+struct mxc_scc_crypto_tmpl {
+ struct mxc_scc *scc;
+ struct crypto_alg alg;
+};
+
+static int mxc_scc_get_data(struct mxc_scc_ctx *ctx,
+ struct crypto_async_request *req)
+{
+ struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
+ struct mxc_scc *scc = ctx->scc;
+ size_t len;
+ void __iomem *from;
+
+ if (ctx->ctrl & SCC_SCM_CTRL_DECRYPT_MODE)
+ from = scc->red_memory;
+ else
+ from = scc->black_memory;
+
+ dev_dbg(scc->dev, "pcopy: from 0x%p %d bytes\n", from,
+ ctx->dst_nents * 8);
+ len = sg_pcopy_from_buffer(ablkreq->dst, ctx->dst_nents,
+ from, ctx->size, ctx->offset);
+ if (!len) {
+ dev_err(scc->dev, "pcopy err from 0x%p (len=%d)\n", from, len);
+ return -EINVAL;
+ }
+
+#ifdef DEBUG
+ print_hex_dump(KERN_ERR,
+ "red memory@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ scc->red_memory, ctx->size, 1);
+ print_hex_dump(KERN_ERR,
+ "black memory@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ scc->black_memory, ctx->size, 1);
+#endif
+
+ ctx->offset += len;
+
+ if (ctx->offset < ablkreq->nbytes)
+ return -EINPROGRESS;
+
+ return 0;
+}
+
+static int mxc_scc_ablkcipher_req_init(struct ablkcipher_request *req,
+ struct mxc_scc_ctx *ctx)
+{
+ struct mxc_scc *scc = ctx->scc;
+
+ ctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
+ if (ctx->src_nents < 0) {
+ dev_err(scc->dev, "Invalid number of src SC");
+ return ctx->src_nents;
+ }
+
+ ctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
+ if (ctx->dst_nents < 0) {
+ dev_err(scc->dev, "Invalid number of dst SC");
+ return ctx->dst_nents;
+ }
+
+ ctx->size = 0;
+ ctx->offset = 0;
+
+ return 0;
+}
+
+static int mxc_scc_ablkcipher_req_complete(struct crypto_async_request *req,
+ struct mxc_scc_ctx *ctx,
+ int result)
+{
+ struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
+ struct mxc_scc *scc = ctx->scc;
+
+ scc->req = NULL;
+ scc->bytes_remaining = scc->memory_size_bytes;
+
+ if (ctx->ctrl & SCC_SCM_CTRL_CBC_MODE)
+ memcpy(ablkreq->info, scc->base + SCC_SCM_INIT_VECTOR_0,
+ scc->block_size_bytes);
+
+ req->complete(req, result);
+ scc->hw_busy = false;
+
+ return 0;
+}
+
+static int mxc_scc_put_data(struct mxc_scc_ctx *ctx,
+ struct ablkcipher_request *req)
+{
+ u8 padding_buffer[sizeof(u16) + sizeof(scc_block_padding)];
+ size_t len = min_t(size_t, req->nbytes - ctx->offset,
+ ctx->scc->bytes_remaining);
+ unsigned int padding_byte_count = 0;
+ struct mxc_scc *scc = ctx->scc;
+ void __iomem *to;
+
+ if (ctx->ctrl & SCC_SCM_CTRL_DECRYPT_MODE)
+ to = scc->black_memory;
+ else
+ to = scc->red_memory;
+
+ if (ctx->ctrl & SCC_SCM_CTRL_CBC_MODE && req->info)
+ memcpy(scc->base + SCC_SCM_INIT_VECTOR_0, req->info,
+ scc->block_size_bytes);
+
+ len = sg_pcopy_to_buffer(req->src, ctx->src_nents,
+ to, len, ctx->offset);
+ if (!len) {
+ dev_err(scc->dev, "pcopy err to 0x%p (len=%d)\n", to, len);
+ return -EINVAL;
+ }
+
+ ctx->size = len;
+
+#ifdef DEBUG
+ dev_dbg(scc->dev, "copied %d bytes to 0x%p\n", len, to);
+ print_hex_dump(KERN_ERR,
+ "init vector0@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ scc->base + SCC_SCM_INIT_VECTOR_0, scc->block_size_bytes,
+ 1);
+ print_hex_dump(KERN_ERR,
+ "red memory@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ scc->red_memory, ctx->size, 1);
+ print_hex_dump(KERN_ERR,
+ "black memory@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ scc->black_memory, ctx->size, 1);
+#endif
+
+ scc->bytes_remaining -= len;
+
+ padding_byte_count = len % scc->block_size_bytes;
+
+ if (padding_byte_count) {
+ memcpy(padding_buffer, scc_block_padding, padding_byte_count);
+ memcpy(to + len, padding_buffer, padding_byte_count);
+ ctx->size += padding_byte_count;
+ }
+
+#ifdef DEBUG
+ print_hex_dump(KERN_ERR,
+ "data to encrypt@"__stringify(__LINE__)": ",
+ DUMP_PREFIX_ADDRESS, 16, 4,
+ to, ctx->size, 1);
+#endif
+
+ return 0;
+}
+
+static void mxc_scc_ablkcipher_next(struct mxc_scc_ctx *ctx,
+ struct crypto_async_request *req)
+{
+ struct ablkcipher_request *ablkreq = ablkcipher_request_cast(req);
+ struct mxc_scc *scc = ctx->scc;
+ int err;
+
+ dev_dbg(scc->dev, "dispatch request (nbytes=%d, src=%p, dst=%p)\n",
+ ablkreq->nbytes, ablkreq->src, ablkreq->dst);
+
+ writel(0, scc->base + SCC_SCM_ERROR_STATUS);
+
+ err = mxc_scc_put_data(ctx, ablkreq);
+ if (err) {
+ mxc_scc_ablkcipher_req_complete(req, ctx, err);
+ return;
+ }
+
+ dev_dbg(scc->dev, "Start encryption (0x%p/0x%p)\n",
+ (void *)readl(scc->base + SCC_SCM_RED_START),
+ (void *)readl(scc->base + SCC_SCM_BLACK_START));
+
+ /* clear interrupt control registers */
+ writel(SCC_SCM_INTR_CTRL_CLR_INTR,
+ scc->base + SCC_SCM_INTR_CTRL);
+
+ writel((ctx->size / ctx->scc->block_size_bytes) - 1,
+ scc->base + SCC_SCM_LENGTH);
+
+ dev_dbg(scc->dev, "Process %d block(s) in 0x%p\n",
+ ctx->size / ctx->scc->block_size_bytes,
+ (ctx->ctrl & SCC_SCM_CTRL_DECRYPT_MODE) ? scc->black_memory :
+ scc->red_memory);
+
+ writel(ctx->ctrl, scc->base + SCC_SCM_CTRL);
+}
+
+static irqreturn_t mxc_scc_int(int irq, void *priv)
+{
+ struct crypto_async_request *req;
+ struct mxc_scc_ctx *ctx;
+ struct mxc_scc *scc = priv;
+ int status;
+ int ret;
+
+ status = readl(scc->base + SCC_SCM_STATUS);
+
+ /* clear interrupt control registers */
+ writel(SCC_SCM_INTR_CTRL_CLR_INTR, scc->base + SCC_SCM_INTR_CTRL);
+
+ if (status & SCC_SCM_STATUS_BUSY)
+ return IRQ_NONE;
+
+ req = scc->req;
+ if (req) {
+ ctx = crypto_tfm_ctx(req->tfm);
+ ret = mxc_scc_get_data(ctx, req);
+ if (ret != -EINPROGRESS)
+ mxc_scc_ablkcipher_req_complete(req, ctx, ret);
+ else
+ mxc_scc_ablkcipher_next(ctx, req);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int mxc_scc_cra_init(struct crypto_tfm *tfm)
+{
+ struct mxc_scc_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_alg *alg = tfm->__crt_alg;
+ struct mxc_scc_crypto_tmpl *algt;
+
+ algt = container_of(alg, struct mxc_scc_crypto_tmpl, alg);
+
+ ctx->scc = algt->scc;
+ return 0;
+}
+
+static void mxc_scc_dequeue_req_unlocked(struct mxc_scc_ctx *ctx)
+{
+ struct crypto_async_request *req, *backlog;
+
+ if (ctx->scc->hw_busy)
+ return;
+
+ spin_lock_bh(&ctx->scc->lock);
+ backlog = crypto_get_backlog(&ctx->scc->queue);
+ req = crypto_dequeue_request(&ctx->scc->queue);
+ ctx->scc->req = req;
+ ctx->scc->hw_busy = true;
+ spin_unlock_bh(&ctx->scc->lock);
+
+ if (!req)
+ return;
+
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+
+ mxc_scc_ablkcipher_next(ctx, req);
+}
+
+static int mxc_scc_queue_req(struct mxc_scc_ctx *ctx,
+ struct crypto_async_request *req)
+{
+ int ret;
+
+ spin_lock_bh(&ctx->scc->lock);
+ ret = crypto_enqueue_request(&ctx->scc->queue, req);
+ spin_unlock_bh(&ctx->scc->lock);
+
+ if (ret != -EINPROGRESS)
+ return ret;
+
+ mxc_scc_dequeue_req_unlocked(ctx);
+
+ return -EINPROGRESS;
+}
+
+static int mxc_scc_des3_op(struct mxc_scc_ctx *ctx,
+ struct ablkcipher_request *req)
+{
+ int err;
+
+ err = mxc_scc_ablkcipher_req_init(req, ctx);
+ if (err)
+ return err;
+
+ return mxc_scc_queue_req(ctx, &req->base);
+}
+
+static int mxc_scc_ecb_des_encrypt(struct ablkcipher_request *req)
+{
+ struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
+ struct mxc_scc_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+
+ ctx->ctrl = SCC_SCM_CTRL_START_CIPHER;
+
+ return mxc_scc_des3_op(ctx, req);
+}
+
+static int mxc_scc_ecb_des_decrypt(struct ablkcipher_request *req)
+{
+ struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
+ struct mxc_scc_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+
+ ctx->ctrl = SCC_SCM_CTRL_START_CIPHER;
+ ctx->ctrl |= SCC_SCM_CTRL_DECRYPT_MODE;
+
+ return mxc_scc_des3_op(ctx, req);
+}
+
+static int mxc_scc_cbc_des_encrypt(struct ablkcipher_request *req)
+{
+ struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
+ struct mxc_scc_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+
+ ctx->ctrl = SCC_SCM_CTRL_START_CIPHER;
+ ctx->ctrl |= SCC_SCM_CTRL_CBC_MODE;
+
+ return mxc_scc_des3_op(ctx, req);
+}
+
+static int mxc_scc_cbc_des_decrypt(struct ablkcipher_request *req)
+{
+ struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(req);
+ struct mxc_scc_ctx *ctx = crypto_ablkcipher_ctx(cipher);
+
+ ctx->ctrl = SCC_SCM_CTRL_START_CIPHER;
+ ctx->ctrl |= SCC_SCM_CTRL_CBC_MODE;
+ ctx->ctrl |= SCC_SCM_CTRL_DECRYPT_MODE;
+
+ return mxc_scc_des3_op(ctx, req);
+}
+
+static void mxc_scc_hw_init(struct mxc_scc *scc)
+{
+ int offset;
+
+ offset = SCC_NON_RESERVED_OFFSET / scc->block_size_bytes;
+
+ /* Fill the RED_START register */
+ writel(offset, scc->base + SCC_SCM_RED_START);
+
+ /* Fill the BLACK_START register */
+ writel(offset, scc->base + SCC_SCM_BLACK_START);
+
+ scc->red_memory = scc->base + SCC_SCM_RED_MEMORY +
+ SCC_NON_RESERVED_OFFSET;
+
+ scc->black_memory = scc->base + SCC_SCM_BLACK_MEMORY +
+ SCC_NON_RESERVED_OFFSET;
+
+ scc->bytes_remaining = scc->memory_size_bytes;
+}
+
+static int mxc_scc_get_config(struct mxc_scc *scc)
+{
+ int config;
+
+ config = readl(scc->base + SCC_SCM_CFG);
+
+ scc->block_size_bytes = config & SCC_SCM_CFG_BLOCK_SIZE_MASK;
+
+ scc->black_ram_size_blocks = config & SCC_SCM_CFG_BLACK_SIZE_MASK;
+
+ scc->memory_size_bytes = (scc->block_size_bytes *
+ scc->black_ram_size_blocks) -
+ SCC_NON_RESERVED_OFFSET;
+
+ return 0;
+}
+
+static enum mxc_scc_state mxc_scc_get_state(struct mxc_scc *scc)
+{
+ enum mxc_scc_state state;
+ int status;
+
+ status = readl(scc->base + SCC_SMN_STATUS) &
+ SCC_SMN_STATUS_STATE_MASK;
+
+ /* If in Health Check, try to bringup to secure state */
+ if (status & SCC_SMN_STATE_HEALTH_CHECK) {
+ /*
+ * Write a simple algorithm to the Algorithm Sequence
+ * Checker (ASC)
+ */
+ writel(0xaaaa, scc->base + SCC_SMN_SEQ_START);
+ writel(0x5555, scc->base + SCC_SMN_SEQ_END);
+ writel(0x5555, scc->base + SCC_SMN_SEQ_CHECK);
+
+ status = readl(scc->base + SCC_SMN_STATUS) &
+ SCC_SMN_STATUS_STATE_MASK;
+ }
+
+ switch (status) {
+ case SCC_SMN_STATE_NON_SECURE:
+ case SCC_SMN_STATE_SECURE:
+ state = SCC_STATE_OK;
+ break;
+ case SCC_SMN_STATE_FAIL:
+ state = SCC_STATE_FAILED;
+ break;
+ default:
+ state = SCC_STATE_UNIMPLEMENTED;
+ break;
+ }
+
+ return state;
+}
+
+static struct mxc_scc_crypto_tmpl scc_ecb_des = {
+ .alg = {
+ .cra_name = "ecb(des3_ede)",
+ .cra_driver_name = "ecb-des3-scc",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct mxc_scc_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = mxc_scc_cra_init,
+ .cra_u.ablkcipher = {
+ .min_keysize = DES3_EDE_KEY_SIZE,
+ .max_keysize = DES3_EDE_KEY_SIZE,
+ .encrypt = mxc_scc_ecb_des_encrypt,
+ .decrypt = mxc_scc_ecb_des_decrypt,
+ }
+ }
+};
+
+static struct mxc_scc_crypto_tmpl scc_cbc_des = {
+ .alg = {
+ .cra_name = "cbc(des3_ede)",
+ .cra_driver_name = "cbc-des3-scc",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER,
+ .cra_blocksize = DES3_EDE_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct mxc_scc_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = mxc_scc_cra_init,
+ .cra_u.ablkcipher = {
+ .min_keysize = DES3_EDE_KEY_SIZE,
+ .max_keysize = DES3_EDE_KEY_SIZE,
+ .encrypt = mxc_scc_cbc_des_encrypt,
+ .decrypt = mxc_scc_cbc_des_decrypt,
+ }
+ }
+};
+
+static struct mxc_scc_crypto_tmpl *scc_crypto_algs[] = {
+ &scc_ecb_des,
+ &scc_cbc_des,
+};
+
+static int mxc_scc_crypto_register(struct mxc_scc *scc)
+{
+ unsigned int i;
+ int err = 0;
+
+ for (i = 0; i < ARRAY_SIZE(scc_crypto_algs); i++) {
+ scc_crypto_algs[i]->scc = scc;
+ err = crypto_register_alg(&scc_crypto_algs[i]->alg);
+ if (err)
+ goto err_out;
+ }
+
+ return 0;
+
+err_out:
+ for (; i > 0; i--)
+ crypto_unregister_alg(&scc_crypto_algs[i]->alg);
+
+ return err;
+}
+
+static void mxc_scc_crypto_unregister(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(scc_crypto_algs); i++)
+ crypto_unregister_alg(&scc_crypto_algs[i]->alg);
+}
+
+static int mxc_scc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ struct mxc_scc *scc;
+ enum mxc_scc_state state;
+ int irq;
+ int ret;
+ int i;
+
+ scc = devm_kzalloc(dev, sizeof(*scc), GFP_KERNEL);
+ if (!scc)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ scc->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(scc->base))
+ return PTR_ERR(scc->base);
+
+ scc->clk = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(scc->clk)) {
+ dev_err(dev, "Could not get ipg clock\n");
+ return PTR_ERR(scc->clk);
+ }
+
+ clk_prepare_enable(scc->clk);
+
+ /* clear error status register */
+ writel(0x0, scc->base + SCC_SCM_ERROR_STATUS);
+
+ /* clear interrupt control registers */
+ writel(SCC_SCM_INTR_CTRL_CLR_INTR |
+ SCC_SCM_INTR_CTRL_MASK_INTR,
+ scc->base + SCC_SCM_INTR_CTRL);
+
+ writel(SCC_SMN_COMMAND_CLR_INTR |
+ SCC_SMN_COMMAND_EN_INTR,
+ scc->base + SCC_SMN_COMMAND);
+
+ scc->dev = dev;
+ platform_set_drvdata(pdev, scc);
+
+ ret = mxc_scc_get_config(scc);
+ if (ret)
+ goto err_out;
+
+ state = mxc_scc_get_state(scc);
+
+ if (state != SCC_STATE_OK) {
+ dev_err(dev, "SCC in unusable state %d\n", state);
+ ret = -EINVAL;
+ goto err_out;
+ }
+
+ mxc_scc_hw_init(scc);
+
+ spin_lock_init(&scc->lock);
+ /* FIXME: calculate queue from RAM slots */
+ crypto_init_queue(&scc->queue, 50);
+
+ for (i = 0; i < 2; i++) {
+ irq = platform_get_irq(pdev, i);
+ if (irq < 0) {
+ dev_err(dev, "failed to get irq resource\n");
+ ret = -EINVAL;
+ goto err_out;
+ }
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, mxc_scc_int,
+ IRQF_ONESHOT, dev_name(dev), scc);
+ if (ret)
+ goto err_out;
+ }
+
+ ret = mxc_scc_crypto_register(scc);
+ if (ret) {
+ dev_err(dev, "could not register algorithms");
+ goto err_out;
+ }
+
+ dev_info(dev, "registered successfully.\n");
+
+ return 0;
+
+err_out:
+ clk_disable_unprepare(scc->clk);
+
+ return ret;
+}
+
+static int mxc_scc_remove(struct platform_device *pdev)
+{
+ struct mxc_scc *scc = platform_get_drvdata(pdev);
+
+ mxc_scc_crypto_unregister();
+
+ clk_disable_unprepare(scc->clk);
+
+ return 0;
+}
+
+static const struct of_device_id mxc_scc_dt_ids[] = {
+ { .compatible = "fsl,imx25-scc", .data = NULL, },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxc_scc_dt_ids);
+
+static struct platform_driver mxc_scc_driver = {
+ .probe = mxc_scc_probe,
+ .remove = mxc_scc_remove,
+ .driver = {
+ .name = "mxc-scc",
+ .of_match_table = mxc_scc_dt_ids,
+ },
+};
+
+module_platform_driver(mxc_scc_driver);
+MODULE_AUTHOR("Steffen Trumtrar <kernel@pengutronix.de>");
+MODULE_DESCRIPTION("Freescale i.MX25 SCC Crypto driver");
+MODULE_LICENSE("GPL v2");
projects / linux-beck.git / commitdiff