--- /dev/null
+/*
+ * Cryptographic API.
+ * Support for Nomadik hardware crypto engine.
+
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Shujuan Chen <shujuan.chen@stericsson.com> for ST-Ericsson
+ * Author: Joakim Bech <joakim.xx.bech@stericsson.com> for ST-Ericsson
+ * Author: Berne Hebark <berne.herbark@stericsson.com> for ST-Ericsson.
+ * Author: Niklas Hernaeus <niklas.hernaeus@stericsson.com> for ST-Ericsson.
+ * Author: Andreas Westin <andreas.westin@stericsson.com> for ST-Ericsson.
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#define pr_fmt(fmt) "hashX hashX: " fmt
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/klist.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/crypto.h>
+
+#include <linux/regulator/consumer.h>
+#include <linux/dmaengine.h>
+#include <linux/bitops.h>
+
+#include <crypto/internal/hash.h>
+#include <crypto/sha.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/algapi.h>
+
+#include <linux/platform_data/crypto-ux500.h>
+
+#include "hash_alg.h"
+
+static int hash_mode;
+module_param(hash_mode, int, 0);
+MODULE_PARM_DESC(hash_mode, "CPU or DMA mode. CPU = 0 (default), DMA = 1");
+
+/**
+ * Pre-calculated empty message digests.
+ */
+static const u8 zero_message_hash_sha1[SHA1_DIGEST_SIZE] = {
+ 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
+ 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
+ 0xaf, 0xd8, 0x07, 0x09
+};
+
+static const u8 zero_message_hash_sha256[SHA256_DIGEST_SIZE] = {
+ 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
+ 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
+ 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
+ 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
+};
+
+/* HMAC-SHA1, no key */
+static const u8 zero_message_hmac_sha1[SHA1_DIGEST_SIZE] = {
+ 0xfb, 0xdb, 0x1d, 0x1b, 0x18, 0xaa, 0x6c, 0x08,
+ 0x32, 0x4b, 0x7d, 0x64, 0xb7, 0x1f, 0xb7, 0x63,
+ 0x70, 0x69, 0x0e, 0x1d
+};
+
+/* HMAC-SHA256, no key */
+static const u8 zero_message_hmac_sha256[SHA256_DIGEST_SIZE] = {
+ 0xb6, 0x13, 0x67, 0x9a, 0x08, 0x14, 0xd9, 0xec,
+ 0x77, 0x2f, 0x95, 0xd7, 0x78, 0xc3, 0x5f, 0xc5,
+ 0xff, 0x16, 0x97, 0xc4, 0x93, 0x71, 0x56, 0x53,
+ 0xc6, 0xc7, 0x12, 0x14, 0x42, 0x92, 0xc5, 0xad
+};
+
+/**
+ * struct hash_driver_data - data specific to the driver.
+ *
+ * @device_list: A list of registered devices to choose from.
+ * @device_allocation: A semaphore initialized with number of devices.
+ */
+struct hash_driver_data {
+ struct klist device_list;
+ struct semaphore device_allocation;
+};
+
+static struct hash_driver_data driver_data;
+
+/* Declaration of functions */
+/**
+ * hash_messagepad - Pads a message and write the nblw bits.
+ * @device_data: Structure for the hash device.
+ * @message: Last word of a message
+ * @index_bytes: The number of bytes in the last message
+ *
+ * This function manages the final part of the digest calculation, when less
+ * than 512 bits (64 bytes) remain in message. This means index_bytes < 64.
+ *
+ */
+static void hash_messagepad(struct hash_device_data *device_data,
+ const u32 *message, u8 index_bytes);
+
+/**
+ * release_hash_device - Releases a previously allocated hash device.
+ * @device_data: Structure for the hash device.
+ *
+ */
+static void release_hash_device(struct hash_device_data *device_data)
+{
+ spin_lock(&device_data->ctx_lock);
+ device_data->current_ctx->device = NULL;
+ device_data->current_ctx = NULL;
+ spin_unlock(&device_data->ctx_lock);
+
+ /*
+ * The down_interruptible part for this semaphore is called in
+ * cryp_get_device_data.
+ */
+ up(&driver_data.device_allocation);
+}
+
+static void hash_dma_setup_channel(struct hash_device_data *device_data,
+ struct device *dev)
+{
+ struct hash_platform_data *platform_data = dev->platform_data;
+ struct dma_slave_config conf = {
+ .direction = DMA_MEM_TO_DEV,
+ .dst_addr = device_data->phybase + HASH_DMA_FIFO,
+ .dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
+ .dst_maxburst = 16,
+ };
+
+ dma_cap_zero(device_data->dma.mask);
+ dma_cap_set(DMA_SLAVE, device_data->dma.mask);
+
+ device_data->dma.cfg_mem2hash = platform_data->mem_to_engine;
+ device_data->dma.chan_mem2hash =
+ dma_request_channel(device_data->dma.mask,
+ platform_data->dma_filter,
+ device_data->dma.cfg_mem2hash);
+
+ dmaengine_slave_config(device_data->dma.chan_mem2hash, &conf);
+
+ init_completion(&device_data->dma.complete);
+}
+
+static void hash_dma_callback(void *data)
+{
+ struct hash_ctx *ctx = data;
+
+ complete(&ctx->device->dma.complete);
+}
+
+static int hash_set_dma_transfer(struct hash_ctx *ctx, struct scatterlist *sg,
+ int len, enum dma_data_direction direction)
+{
+ struct dma_async_tx_descriptor *desc = NULL;
+ struct dma_chan *channel = NULL;
+ dma_cookie_t cookie;
+
+ if (direction != DMA_TO_DEVICE) {
+ dev_err(ctx->device->dev, "%s: Invalid DMA direction\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ sg->length = ALIGN(sg->length, HASH_DMA_ALIGN_SIZE);
+
+ channel = ctx->device->dma.chan_mem2hash;
+ ctx->device->dma.sg = sg;
+ ctx->device->dma.sg_len = dma_map_sg(channel->device->dev,
+ ctx->device->dma.sg, ctx->device->dma.nents,
+ direction);
+
+ if (!ctx->device->dma.sg_len) {
+ dev_err(ctx->device->dev, "%s: Could not map the sg list (TO_DEVICE)\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ dev_dbg(ctx->device->dev, "%s: Setting up DMA for buffer (TO_DEVICE)\n",
+ __func__);
+ desc = dmaengine_prep_slave_sg(channel,
+ ctx->device->dma.sg, ctx->device->dma.sg_len,
+ direction, DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(ctx->device->dev,
+ "%s: dmaengine_prep_slave_sg() failed!\n", __func__);
+ return -EFAULT;
+ }
+
+ desc->callback = hash_dma_callback;
+ desc->callback_param = ctx;
+
+ cookie = dmaengine_submit(desc);
+ dma_async_issue_pending(channel);
+
+ return 0;
+}
+
+static void hash_dma_done(struct hash_ctx *ctx)
+{
+ struct dma_chan *chan;
+
+ chan = ctx->device->dma.chan_mem2hash;
+ dmaengine_terminate_all(chan);
+ dma_unmap_sg(chan->device->dev, ctx->device->dma.sg,
+ ctx->device->dma.sg_len, DMA_TO_DEVICE);
+}
+
+static int hash_dma_write(struct hash_ctx *ctx,
+ struct scatterlist *sg, int len)
+{
+ int error = hash_set_dma_transfer(ctx, sg, len, DMA_TO_DEVICE);
+ if (error) {
+ dev_dbg(ctx->device->dev,
+ "%s: hash_set_dma_transfer() failed\n", __func__);
+ return error;
+ }
+
+ return len;
+}
+
+/**
+ * get_empty_message_digest - Returns a pre-calculated digest for
+ * the empty message.
+ * @device_data: Structure for the hash device.
+ * @zero_hash: Buffer to return the empty message digest.
+ * @zero_hash_size: Hash size of the empty message digest.
+ * @zero_digest: True if zero_digest returned.
+ */
+static int get_empty_message_digest(
+ struct hash_device_data *device_data,
+ u8 *zero_hash, u32 *zero_hash_size, bool *zero_digest)
+{
+ int ret = 0;
+ struct hash_ctx *ctx = device_data->current_ctx;
+ *zero_digest = false;
+
+ /**
+ * Caller responsible for ctx != NULL.
+ */
+
+ if (HASH_OPER_MODE_HASH == ctx->config.oper_mode) {
+ if (HASH_ALGO_SHA1 == ctx->config.algorithm) {
+ memcpy(zero_hash, &zero_message_hash_sha1[0],
+ SHA1_DIGEST_SIZE);
+ *zero_hash_size = SHA1_DIGEST_SIZE;
+ *zero_digest = true;
+ } else if (HASH_ALGO_SHA256 ==
+ ctx->config.algorithm) {
+ memcpy(zero_hash, &zero_message_hash_sha256[0],
+ SHA256_DIGEST_SIZE);
+ *zero_hash_size = SHA256_DIGEST_SIZE;
+ *zero_digest = true;
+ } else {
+ dev_err(device_data->dev, "%s: Incorrect algorithm!\n",
+ __func__);
+ ret = -EINVAL;
+ goto out;
+ }
+ } else if (HASH_OPER_MODE_HMAC == ctx->config.oper_mode) {
+ if (!ctx->keylen) {
+ if (HASH_ALGO_SHA1 == ctx->config.algorithm) {
+ memcpy(zero_hash, &zero_message_hmac_sha1[0],
+ SHA1_DIGEST_SIZE);
+ *zero_hash_size = SHA1_DIGEST_SIZE;
+ *zero_digest = true;
+ } else if (HASH_ALGO_SHA256 == ctx->config.algorithm) {
+ memcpy(zero_hash, &zero_message_hmac_sha256[0],
+ SHA256_DIGEST_SIZE);
+ *zero_hash_size = SHA256_DIGEST_SIZE;
+ *zero_digest = true;
+ } else {
+ dev_err(device_data->dev, "%s: Incorrect algorithm!\n",
+ __func__);
+ ret = -EINVAL;
+ goto out;
+ }
+ } else {
+ dev_dbg(device_data->dev,
+ "%s: Continue hash calculation, since hmac key available\n",
+ __func__);
+ }
+ }
+out:
+
+ return ret;
+}
+
+/**
+ * hash_disable_power - Request to disable power and clock.
+ * @device_data: Structure for the hash device.
+ * @save_device_state: If true, saves the current hw state.
+ *
+ * This function request for disabling power (regulator) and clock,
+ * and could also save current hw state.
+ */
+static int hash_disable_power(struct hash_device_data *device_data,
+ bool save_device_state)
+{
+ int ret = 0;
+ struct device *dev = device_data->dev;
+
+ spin_lock(&device_data->power_state_lock);
+ if (!device_data->power_state)
+ goto out;
+
+ if (save_device_state) {
+ hash_save_state(device_data,
+ &device_data->state);
+ device_data->restore_dev_state = true;
+ }
+
+ clk_disable(device_data->clk);
+ ret = regulator_disable(device_data->regulator);
+ if (ret)
+ dev_err(dev, "%s: regulator_disable() failed!\n", __func__);
+
+ device_data->power_state = false;
+
+out:
+ spin_unlock(&device_data->power_state_lock);
+
+ return ret;
+}
+
+/**
+ * hash_enable_power - Request to enable power and clock.
+ * @device_data: Structure for the hash device.
+ * @restore_device_state: If true, restores a previous saved hw state.
+ *
+ * This function request for enabling power (regulator) and clock,
+ * and could also restore a previously saved hw state.
+ */
+static int hash_enable_power(struct hash_device_data *device_data,
+ bool restore_device_state)
+{
+ int ret = 0;
+ struct device *dev = device_data->dev;
+
+ spin_lock(&device_data->power_state_lock);
+ if (!device_data->power_state) {
+ ret = regulator_enable(device_data->regulator);
+ if (ret) {
+ dev_err(dev, "%s: regulator_enable() failed!\n",
+ __func__);
+ goto out;
+ }
+ ret = clk_enable(device_data->clk);
+ if (ret) {
+ dev_err(dev, "%s: clk_enable() failed!\n", __func__);
+ ret = regulator_disable(
+ device_data->regulator);
+ goto out;
+ }
+ device_data->power_state = true;
+ }
+
+ if (device_data->restore_dev_state) {
+ if (restore_device_state) {
+ device_data->restore_dev_state = false;
+ hash_resume_state(device_data, &device_data->state);
+ }
+ }
+out:
+ spin_unlock(&device_data->power_state_lock);
+
+ return ret;
+}
+
+/**
+ * hash_get_device_data - Checks for an available hash device and return it.
+ * @hash_ctx: Structure for the hash context.
+ * @device_data: Structure for the hash device.
+ *
+ * This function check for an available hash device and return it to
+ * the caller.
+ * Note! Caller need to release the device, calling up().
+ */
+static int hash_get_device_data(struct hash_ctx *ctx,
+ struct hash_device_data **device_data)
+{
+ int ret;
+ struct klist_iter device_iterator;
+ struct klist_node *device_node;
+ struct hash_device_data *local_device_data = NULL;
+
+ /* Wait until a device is available */
+ ret = down_interruptible(&driver_data.device_allocation);
+ if (ret)
+ return ret; /* Interrupted */
+
+ /* Select a device */
+ klist_iter_init(&driver_data.device_list, &device_iterator);
+ device_node = klist_next(&device_iterator);
+ while (device_node) {
+ local_device_data = container_of(device_node,
+ struct hash_device_data, list_node);
+ spin_lock(&local_device_data->ctx_lock);
+ /* current_ctx allocates a device, NULL = unallocated */
+ if (local_device_data->current_ctx) {
+ device_node = klist_next(&device_iterator);
+ } else {
+ local_device_data->current_ctx = ctx;
+ ctx->device = local_device_data;
+ spin_unlock(&local_device_data->ctx_lock);
+ break;
+ }
+ spin_unlock(&local_device_data->ctx_lock);
+ }
+ klist_iter_exit(&device_iterator);
+
+ if (!device_node) {
+ /**
+ * No free device found.
+ * Since we allocated a device with down_interruptible, this
+ * should not be able to happen.
+ * Number of available devices, which are contained in
+ * device_allocation, is therefore decremented by not doing
+ * an up(device_allocation).
+ */
+ return -EBUSY;
+ }
+
+ *device_data = local_device_data;
+
+ return 0;
+}
+
+/**
+ * hash_hw_write_key - Writes the key to the hardware registries.
+ *
+ * @device_data: Structure for the hash device.
+ * @key: Key to be written.
+ * @keylen: The lengt of the key.
+ *
+ * Note! This function DOES NOT write to the NBLW registry, even though
+ * specified in the the hw design spec. Either due to incorrect info in the
+ * spec or due to a bug in the hw.
+ */
+static void hash_hw_write_key(struct hash_device_data *device_data,
+ const u8 *key, unsigned int keylen)
+{
+ u32 word = 0;
+ int nwords = 1;
+
+ HASH_CLEAR_BITS(&device_data->base->str, HASH_STR_NBLW_MASK);
+
+ while (keylen >= 4) {
+ u32 *key_word = (u32 *)key;
+
+ HASH_SET_DIN(key_word, nwords);
+ keylen -= 4;
+ key += 4;
+ }
+
+ /* Take care of the remaining bytes in the last word */
+ if (keylen) {
+ word = 0;
+ while (keylen) {
+ word |= (key[keylen - 1] << (8 * (keylen - 1)));
+ keylen--;
+ }
+
+ HASH_SET_DIN(&word, nwords);
+ }
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+
+ HASH_SET_DCAL;
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+}
+
+/**
+ * init_hash_hw - Initialise the hash hardware for a new calculation.
+ * @device_data: Structure for the hash device.
+ * @ctx: The hash context.
+ *
+ * This function will enable the bits needed to clear and start a new
+ * calculation.
+ */
+static int init_hash_hw(struct hash_device_data *device_data,
+ struct hash_ctx *ctx)
+{
+ int ret = 0;
+
+ ret = hash_setconfiguration(device_data, &ctx->config);
+ if (ret) {
+ dev_err(device_data->dev, "%s: hash_setconfiguration() failed!\n",
+ __func__);
+ return ret;
+ }
+
+ hash_begin(device_data, ctx);
+
+ if (ctx->config.oper_mode == HASH_OPER_MODE_HMAC)
+ hash_hw_write_key(device_data, ctx->key, ctx->keylen);
+
+ return ret;
+}
+
+/**
+ * hash_get_nents - Return number of entries (nents) in scatterlist (sg).
+ *
+ * @sg: Scatterlist.
+ * @size: Size in bytes.
+ * @aligned: True if sg data aligned to work in DMA mode.
+ *
+ */
+static int hash_get_nents(struct scatterlist *sg, int size, bool *aligned)
+{
+ int nents = 0;
+ bool aligned_data = true;
+
+ while (size > 0 && sg) {
+ nents++;
+ size -= sg->length;
+
+ /* hash_set_dma_transfer will align last nent */
+ if ((aligned && !IS_ALIGNED(sg->offset, HASH_DMA_ALIGN_SIZE)) ||
+ (!IS_ALIGNED(sg->length, HASH_DMA_ALIGN_SIZE) && size > 0))
+ aligned_data = false;
+
+ sg = sg_next(sg);
+ }
+
+ if (aligned)
+ *aligned = aligned_data;
+
+ if (size != 0)
+ return -EFAULT;
+
+ return nents;
+}
+
+/**
+ * hash_dma_valid_data - checks for dma valid sg data.
+ * @sg: Scatterlist.
+ * @datasize: Datasize in bytes.
+ *
+ * NOTE! This function checks for dma valid sg data, since dma
+ * only accept datasizes of even wordsize.
+ */
+static bool hash_dma_valid_data(struct scatterlist *sg, int datasize)
+{
+ bool aligned;
+
+ /* Need to include at least one nent, else error */
+ if (hash_get_nents(sg, datasize, &aligned) < 1)
+ return false;
+
+ return aligned;
+}
+
+/**
+ * hash_init - Common hash init function for SHA1/SHA2 (SHA256).
+ * @req: The hash request for the job.
+ *
+ * Initialize structures.
+ */
+static int hash_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+
+ if (!ctx->key)
+ ctx->keylen = 0;
+
+ memset(&req_ctx->state, 0, sizeof(struct hash_state));
+ req_ctx->updated = 0;
+ if (hash_mode == HASH_MODE_DMA) {
+ if (req->nbytes < HASH_DMA_ALIGN_SIZE) {
+ req_ctx->dma_mode = false; /* Don't use DMA */
+
+ pr_debug("%s: DMA mode, but direct to CPU mode for data size < %d\n",
+ __func__, HASH_DMA_ALIGN_SIZE);
+ } else {
+ if (req->nbytes >= HASH_DMA_PERFORMANCE_MIN_SIZE &&
+ hash_dma_valid_data(req->src, req->nbytes)) {
+ req_ctx->dma_mode = true;
+ } else {
+ req_ctx->dma_mode = false;
+ pr_debug("%s: DMA mode, but use CPU mode for datalength < %d or non-aligned data, except in last nent\n",
+ __func__,
+ HASH_DMA_PERFORMANCE_MIN_SIZE);
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * hash_processblock - This function processes a single block of 512 bits (64
+ * bytes), word aligned, starting at message.
+ * @device_data: Structure for the hash device.
+ * @message: Block (512 bits) of message to be written to
+ * the HASH hardware.
+ *
+ */
+static void hash_processblock(struct hash_device_data *device_data,
+ const u32 *message, int length)
+{
+ int len = length / HASH_BYTES_PER_WORD;
+ /*
+ * NBLW bits. Reset the number of bits in last word (NBLW).
+ */
+ HASH_CLEAR_BITS(&device_data->base->str, HASH_STR_NBLW_MASK);
+
+ /*
+ * Write message data to the HASH_DIN register.
+ */
+ HASH_SET_DIN(message, len);
+}
+
+/**
+ * hash_messagepad - Pads a message and write the nblw bits.
+ * @device_data: Structure for the hash device.
+ * @message: Last word of a message.
+ * @index_bytes: The number of bytes in the last message.
+ *
+ * This function manages the final part of the digest calculation, when less
+ * than 512 bits (64 bytes) remain in message. This means index_bytes < 64.
+ *
+ */
+static void hash_messagepad(struct hash_device_data *device_data,
+ const u32 *message, u8 index_bytes)
+{
+ int nwords = 1;
+
+ /*
+ * Clear hash str register, only clear NBLW
+ * since DCAL will be reset by hardware.
+ */
+ HASH_CLEAR_BITS(&device_data->base->str, HASH_STR_NBLW_MASK);
+
+ /* Main loop */
+ while (index_bytes >= 4) {
+ HASH_SET_DIN(message, nwords);
+ index_bytes -= 4;
+ message++;
+ }
+
+ if (index_bytes)
+ HASH_SET_DIN(message, nwords);
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+
+ /* num_of_bytes == 0 => NBLW <- 0 (32 bits valid in DATAIN) */
+ HASH_SET_NBLW(index_bytes * 8);
+ dev_dbg(device_data->dev, "%s: DIN=0x%08x NBLW=%lu\n",
+ __func__, readl_relaxed(&device_data->base->din),
+ readl_relaxed(&device_data->base->str) & HASH_STR_NBLW_MASK);
+ HASH_SET_DCAL;
+ dev_dbg(device_data->dev, "%s: after dcal -> DIN=0x%08x NBLW=%lu\n",
+ __func__, readl_relaxed(&device_data->base->din),
+ readl_relaxed(&device_data->base->str) & HASH_STR_NBLW_MASK);
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+}
+
+/**
+ * hash_incrementlength - Increments the length of the current message.
+ * @ctx: Hash context
+ * @incr: Length of message processed already
+ *
+ * Overflow cannot occur, because conditions for overflow are checked in
+ * hash_hw_update.
+ */
+static void hash_incrementlength(struct hash_req_ctx *ctx, u32 incr)
+{
+ ctx->state.length.low_word += incr;
+
+ /* Check for wrap-around */
+ if (ctx->state.length.low_word < incr)
+ ctx->state.length.high_word++;
+}
+
+/**
+ * hash_setconfiguration - Sets the required configuration for the hash
+ * hardware.
+ * @device_data: Structure for the hash device.
+ * @config: Pointer to a configuration structure.
+ */
+int hash_setconfiguration(struct hash_device_data *device_data,
+ struct hash_config *config)
+{
+ int ret = 0;
+
+ if (config->algorithm != HASH_ALGO_SHA1 &&
+ config->algorithm != HASH_ALGO_SHA256)
+ return -EPERM;
+
+ /*
+ * DATAFORM bits. Set the DATAFORM bits to 0b11, which means the data
+ * to be written to HASH_DIN is considered as 32 bits.
+ */
+ HASH_SET_DATA_FORMAT(config->data_format);
+
+ /*
+ * ALGO bit. Set to 0b1 for SHA-1 and 0b0 for SHA-256
+ */
+ switch (config->algorithm) {
+ case HASH_ALGO_SHA1:
+ HASH_SET_BITS(&device_data->base->cr, HASH_CR_ALGO_MASK);
+ break;
+
+ case HASH_ALGO_SHA256:
+ HASH_CLEAR_BITS(&device_data->base->cr, HASH_CR_ALGO_MASK);
+ break;
+
+ default:
+ dev_err(device_data->dev, "%s: Incorrect algorithm\n",
+ __func__);
+ return -EPERM;
+ }
+
+ /*
+ * MODE bit. This bit selects between HASH or HMAC mode for the
+ * selected algorithm. 0b0 = HASH and 0b1 = HMAC.
+ */
+ if (HASH_OPER_MODE_HASH == config->oper_mode)
+ HASH_CLEAR_BITS(&device_data->base->cr,
+ HASH_CR_MODE_MASK);
+ else if (HASH_OPER_MODE_HMAC == config->oper_mode) {
+ HASH_SET_BITS(&device_data->base->cr, HASH_CR_MODE_MASK);
+ if (device_data->current_ctx->keylen > HASH_BLOCK_SIZE) {
+ /* Truncate key to blocksize */
+ dev_dbg(device_data->dev, "%s: LKEY set\n", __func__);
+ HASH_SET_BITS(&device_data->base->cr,
+ HASH_CR_LKEY_MASK);
+ } else {
+ dev_dbg(device_data->dev, "%s: LKEY cleared\n",
+ __func__);
+ HASH_CLEAR_BITS(&device_data->base->cr,
+ HASH_CR_LKEY_MASK);
+ }
+ } else { /* Wrong hash mode */
+ ret = -EPERM;
+ dev_err(device_data->dev, "%s: HASH_INVALID_PARAMETER!\n",
+ __func__);
+ }
+ return ret;
+}
+
+/**
+ * hash_begin - This routine resets some globals and initializes the hash
+ * hardware.
+ * @device_data: Structure for the hash device.
+ * @ctx: Hash context.
+ */
+void hash_begin(struct hash_device_data *device_data, struct hash_ctx *ctx)
+{
+ /* HW and SW initializations */
+ /* Note: there is no need to initialize buffer and digest members */
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+
+ /*
+ * INIT bit. Set this bit to 0b1 to reset the HASH processor core and
+ * prepare the initialize the HASH accelerator to compute the message
+ * digest of a new message.
+ */
+ HASH_INITIALIZE;
+
+ /*
+ * NBLW bits. Reset the number of bits in last word (NBLW).
+ */
+ HASH_CLEAR_BITS(&device_data->base->str, HASH_STR_NBLW_MASK);
+}
+
+static int hash_process_data(struct hash_device_data *device_data,
+ struct hash_ctx *ctx, struct hash_req_ctx *req_ctx,
+ int msg_length, u8 *data_buffer, u8 *buffer,
+ u8 *index)
+{
+ int ret = 0;
+ u32 count;
+
+ do {
+ if ((*index + msg_length) < HASH_BLOCK_SIZE) {
+ for (count = 0; count < msg_length; count++) {
+ buffer[*index + count] =
+ *(data_buffer + count);
+ }
+ *index += msg_length;
+ msg_length = 0;
+ } else {
+ if (req_ctx->updated) {
+ ret = hash_resume_state(device_data,
+ &device_data->state);
+ memmove(req_ctx->state.buffer,
+ device_data->state.buffer,
+ HASH_BLOCK_SIZE / sizeof(u32));
+ if (ret) {
+ dev_err(device_data->dev,
+ "%s: hash_resume_state() failed!\n",
+ __func__);
+ goto out;
+ }
+ } else {
+ ret = init_hash_hw(device_data, ctx);
+ if (ret) {
+ dev_err(device_data->dev,
+ "%s: init_hash_hw() failed!\n",
+ __func__);
+ goto out;
+ }
+ req_ctx->updated = 1;
+ }
+ /*
+ * If 'data_buffer' is four byte aligned and
+ * local buffer does not have any data, we can
+ * write data directly from 'data_buffer' to
+ * HW peripheral, otherwise we first copy data
+ * to a local buffer
+ */
+ if ((0 == (((u32)data_buffer) % 4)) &&
+ (0 == *index))
+ hash_processblock(device_data,
+ (const u32 *)data_buffer,
+ HASH_BLOCK_SIZE);
+ else {
+ for (count = 0;
+ count < (u32)(HASH_BLOCK_SIZE - *index);
+ count++) {
+ buffer[*index + count] =
+ *(data_buffer + count);
+ }
+ hash_processblock(device_data,
+ (const u32 *)buffer,
+ HASH_BLOCK_SIZE);
+ }
+ hash_incrementlength(req_ctx, HASH_BLOCK_SIZE);
+ data_buffer += (HASH_BLOCK_SIZE - *index);
+
+ msg_length -= (HASH_BLOCK_SIZE - *index);
+ *index = 0;
+
+ ret = hash_save_state(device_data,
+ &device_data->state);
+
+ memmove(device_data->state.buffer,
+ req_ctx->state.buffer,
+ HASH_BLOCK_SIZE / sizeof(u32));
+ if (ret) {
+ dev_err(device_data->dev, "%s: hash_save_state() failed!\n",
+ __func__);
+ goto out;
+ }
+ }
+ } while (msg_length != 0);
+out:
+
+ return ret;
+}
+
+/**
+ * hash_dma_final - The hash dma final function for SHA1/SHA256.
+ * @req: The hash request for the job.
+ */
+static int hash_dma_final(struct ahash_request *req)
+{
+ int ret = 0;
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+ struct hash_device_data *device_data;
+ u8 digest[SHA256_DIGEST_SIZE];
+ int bytes_written = 0;
+
+ ret = hash_get_device_data(ctx, &device_data);
+ if (ret)
+ return ret;
+
+ dev_dbg(device_data->dev, "%s: (ctx=0x%x)!\n", __func__, (u32) ctx);
+
+ if (req_ctx->updated) {
+ ret = hash_resume_state(device_data, &device_data->state);
+
+ if (ret) {
+ dev_err(device_data->dev, "%s: hash_resume_state() failed!\n",
+ __func__);
+ goto out;
+ }
+ }
+
+ if (!req_ctx->updated) {
+ ret = hash_setconfiguration(device_data, &ctx->config);
+ if (ret) {
+ dev_err(device_data->dev,
+ "%s: hash_setconfiguration() failed!\n",
+ __func__);
+ goto out;
+ }
+
+ /* Enable DMA input */
+ if (hash_mode != HASH_MODE_DMA || !req_ctx->dma_mode) {
+ HASH_CLEAR_BITS(&device_data->base->cr,
+ HASH_CR_DMAE_MASK);
+ } else {
+ HASH_SET_BITS(&device_data->base->cr,
+ HASH_CR_DMAE_MASK);
+ HASH_SET_BITS(&device_data->base->cr,
+ HASH_CR_PRIVN_MASK);
+ }
+
+ HASH_INITIALIZE;
+
+ if (ctx->config.oper_mode == HASH_OPER_MODE_HMAC)
+ hash_hw_write_key(device_data, ctx->key, ctx->keylen);
+
+ /* Number of bits in last word = (nbytes * 8) % 32 */
+ HASH_SET_NBLW((req->nbytes * 8) % 32);
+ req_ctx->updated = 1;
+ }
+
+ /* Store the nents in the dma struct. */
+ ctx->device->dma.nents = hash_get_nents(req->src, req->nbytes, NULL);
+ if (!ctx->device->dma.nents) {
+ dev_err(device_data->dev, "%s: ctx->device->dma.nents = 0\n",
+ __func__);
+ ret = ctx->device->dma.nents;
+ goto out;
+ }
+
+ bytes_written = hash_dma_write(ctx, req->src, req->nbytes);
+ if (bytes_written != req->nbytes) {
+ dev_err(device_data->dev, "%s: hash_dma_write() failed!\n",
+ __func__);
+ ret = bytes_written;
+ goto out;
+ }
+
+ wait_for_completion(&ctx->device->dma.complete);
+ hash_dma_done(ctx);
+
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+
+ if (ctx->config.oper_mode == HASH_OPER_MODE_HMAC && ctx->key) {
+ unsigned int keylen = ctx->keylen;
+ u8 *key = ctx->key;
+
+ dev_dbg(device_data->dev, "%s: keylen: %d\n",
+ __func__, ctx->keylen);
+ hash_hw_write_key(device_data, key, keylen);
+ }
+
+ hash_get_digest(device_data, digest, ctx->config.algorithm);
+ memcpy(req->result, digest, ctx->digestsize);
+
+out:
+ release_hash_device(device_data);
+
+ /**
+ * Allocated in setkey, and only used in HMAC.
+ */
+ kfree(ctx->key);
+
+ return ret;
+}
+
+/**
+ * hash_hw_final - The final hash calculation function
+ * @req: The hash request for the job.
+ */
+static int hash_hw_final(struct ahash_request *req)
+{
+ int ret = 0;
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+ struct hash_device_data *device_data;
+ u8 digest[SHA256_DIGEST_SIZE];
+
+ ret = hash_get_device_data(ctx, &device_data);
+ if (ret)
+ return ret;
+
+ dev_dbg(device_data->dev, "%s: (ctx=0x%x)!\n", __func__, (u32) ctx);
+
+ if (req_ctx->updated) {
+ ret = hash_resume_state(device_data, &device_data->state);
+
+ if (ret) {
+ dev_err(device_data->dev,
+ "%s: hash_resume_state() failed!\n", __func__);
+ goto out;
+ }
+ } else if (req->nbytes == 0 && ctx->keylen == 0) {
+ u8 zero_hash[SHA256_DIGEST_SIZE];
+ u32 zero_hash_size = 0;
+ bool zero_digest = false;
+ /**
+ * Use a pre-calculated empty message digest
+ * (workaround since hw return zeroes, hw bug!?)
+ */
+ ret = get_empty_message_digest(device_data, &zero_hash[0],
+ &zero_hash_size, &zero_digest);
+ if (!ret && likely(zero_hash_size == ctx->digestsize) &&
+ zero_digest) {
+ memcpy(req->result, &zero_hash[0], ctx->digestsize);
+ goto out;
+ } else if (!ret && !zero_digest) {
+ dev_dbg(device_data->dev,
+ "%s: HMAC zero msg with key, continue...\n",
+ __func__);
+ } else {
+ dev_err(device_data->dev,
+ "%s: ret=%d, or wrong digest size? %s\n",
+ __func__, ret,
+ zero_hash_size == ctx->digestsize ?
+ "true" : "false");
+ /* Return error */
+ goto out;
+ }
+ } else if (req->nbytes == 0 && ctx->keylen > 0) {
+ dev_err(device_data->dev, "%s: Empty message with keylength > 0, NOT supported\n",
+ __func__);
+ goto out;
+ }
+
+ if (!req_ctx->updated) {
+ ret = init_hash_hw(device_data, ctx);
+ if (ret) {
+ dev_err(device_data->dev,
+ "%s: init_hash_hw() failed!\n", __func__);
+ goto out;
+ }
+ }
+
+ if (req_ctx->state.index) {
+ hash_messagepad(device_data, req_ctx->state.buffer,
+ req_ctx->state.index);
+ } else {
+ HASH_SET_DCAL;
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+ }
+
+ if (ctx->config.oper_mode == HASH_OPER_MODE_HMAC && ctx->key) {
+ unsigned int keylen = ctx->keylen;
+ u8 *key = ctx->key;
+
+ dev_dbg(device_data->dev, "%s: keylen: %d\n",
+ __func__, ctx->keylen);
+ hash_hw_write_key(device_data, key, keylen);
+ }
+
+ hash_get_digest(device_data, digest, ctx->config.algorithm);
+ memcpy(req->result, digest, ctx->digestsize);
+
+out:
+ release_hash_device(device_data);
+
+ /**
+ * Allocated in setkey, and only used in HMAC.
+ */
+ kfree(ctx->key);
+
+ return ret;
+}
+
+/**
+ * hash_hw_update - Updates current HASH computation hashing another part of
+ * the message.
+ * @req: Byte array containing the message to be hashed (caller
+ * allocated).
+ */
+int hash_hw_update(struct ahash_request *req)
+{
+ int ret = 0;
+ u8 index = 0;
+ u8 *buffer;
+ struct hash_device_data *device_data;
+ u8 *data_buffer;
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+ struct crypto_hash_walk walk;
+ int msg_length = crypto_hash_walk_first(req, &walk);
+
+ /* Empty message ("") is correct indata */
+ if (msg_length == 0)
+ return ret;
+
+ index = req_ctx->state.index;
+ buffer = (u8 *)req_ctx->state.buffer;
+
+ /* Check if ctx->state.length + msg_length
+ overflows */
+ if (msg_length > (req_ctx->state.length.low_word + msg_length) &&
+ HASH_HIGH_WORD_MAX_VAL == req_ctx->state.length.high_word) {
+ pr_err("%s: HASH_MSG_LENGTH_OVERFLOW!\n", __func__);
+ return -EPERM;
+ }
+
+ ret = hash_get_device_data(ctx, &device_data);
+ if (ret)
+ return ret;
+
+ /* Main loop */
+ while (0 != msg_length) {
+ data_buffer = walk.data;
+ ret = hash_process_data(device_data, ctx, req_ctx, msg_length,
+ data_buffer, buffer, &index);
+
+ if (ret) {
+ dev_err(device_data->dev, "%s: hash_internal_hw_update() failed!\n",
+ __func__);
+ goto out;
+ }
+
+ msg_length = crypto_hash_walk_done(&walk, 0);
+ }
+
+ req_ctx->state.index = index;
+ dev_dbg(device_data->dev, "%s: indata length=%d, bin=%d\n",
+ __func__, req_ctx->state.index, req_ctx->state.bit_index);
+
+out:
+ release_hash_device(device_data);
+
+ return ret;
+}
+
+/**
+ * hash_resume_state - Function that resumes the state of an calculation.
+ * @device_data: Pointer to the device structure.
+ * @device_state: The state to be restored in the hash hardware
+ */
+int hash_resume_state(struct hash_device_data *device_data,
+ const struct hash_state *device_state)
+{
+ u32 temp_cr;
+ s32 count;
+ int hash_mode = HASH_OPER_MODE_HASH;
+
+ if (NULL == device_state) {
+ dev_err(device_data->dev, "%s: HASH_INVALID_PARAMETER!\n",
+ __func__);
+ return -EPERM;
+ }
+
+ /* Check correctness of index and length members */
+ if (device_state->index > HASH_BLOCK_SIZE ||
+ (device_state->length.low_word % HASH_BLOCK_SIZE) != 0) {
+ dev_err(device_data->dev, "%s: HASH_INVALID_PARAMETER!\n",
+ __func__);
+ return -EPERM;
+ }
+
+ /*
+ * INIT bit. Set this bit to 0b1 to reset the HASH processor core and
+ * prepare the initialize the HASH accelerator to compute the message
+ * digest of a new message.
+ */
+ HASH_INITIALIZE;
+
+ temp_cr = device_state->temp_cr;
+ writel_relaxed(temp_cr & HASH_CR_RESUME_MASK, &device_data->base->cr);
+
+ if (readl(&device_data->base->cr) & HASH_CR_MODE_MASK)
+ hash_mode = HASH_OPER_MODE_HMAC;
+ else
+ hash_mode = HASH_OPER_MODE_HASH;
+
+ for (count = 0; count < HASH_CSR_COUNT; count++) {
+ if ((count >= 36) && (hash_mode == HASH_OPER_MODE_HASH))
+ break;
+
+ writel_relaxed(device_state->csr[count],
+ &device_data->base->csrx[count]);
+ }
+
+ writel_relaxed(device_state->csfull, &device_data->base->csfull);
+ writel_relaxed(device_state->csdatain, &device_data->base->csdatain);
+
+ writel_relaxed(device_state->str_reg, &device_data->base->str);
+ writel_relaxed(temp_cr, &device_data->base->cr);
+
+ return 0;
+}
+
+/**
+ * hash_save_state - Function that saves the state of hardware.
+ * @device_data: Pointer to the device structure.
+ * @device_state: The strucure where the hardware state should be saved.
+ */
+int hash_save_state(struct hash_device_data *device_data,
+ struct hash_state *device_state)
+{
+ u32 temp_cr;
+ u32 count;
+ int hash_mode = HASH_OPER_MODE_HASH;
+
+ if (NULL == device_state) {
+ dev_err(device_data->dev, "%s: HASH_INVALID_PARAMETER!\n",
+ __func__);
+ return -ENOTSUPP;
+ }
+
+ /* Write dummy value to force digest intermediate calculation. This
+ * actually makes sure that there isn't any ongoing calculation in the
+ * hardware.
+ */
+ while (readl(&device_data->base->str) & HASH_STR_DCAL_MASK)
+ cpu_relax();
+
+ temp_cr = readl_relaxed(&device_data->base->cr);
+
+ device_state->str_reg = readl_relaxed(&device_data->base->str);
+
+ device_state->din_reg = readl_relaxed(&device_data->base->din);
+
+ if (readl(&device_data->base->cr) & HASH_CR_MODE_MASK)
+ hash_mode = HASH_OPER_MODE_HMAC;
+ else
+ hash_mode = HASH_OPER_MODE_HASH;
+
+ for (count = 0; count < HASH_CSR_COUNT; count++) {
+ if ((count >= 36) && (hash_mode == HASH_OPER_MODE_HASH))
+ break;
+
+ device_state->csr[count] =
+ readl_relaxed(&device_data->base->csrx[count]);
+ }
+
+ device_state->csfull = readl_relaxed(&device_data->base->csfull);
+ device_state->csdatain = readl_relaxed(&device_data->base->csdatain);
+
+ device_state->temp_cr = temp_cr;
+
+ return 0;
+}
+
+/**
+ * hash_check_hw - This routine checks for peripheral Ids and PCell Ids.
+ * @device_data:
+ *
+ */
+int hash_check_hw(struct hash_device_data *device_data)
+{
+ /* Checking Peripheral Ids */
+ if (HASH_P_ID0 == readl_relaxed(&device_data->base->periphid0) &&
+ HASH_P_ID1 == readl_relaxed(&device_data->base->periphid1) &&
+ HASH_P_ID2 == readl_relaxed(&device_data->base->periphid2) &&
+ HASH_P_ID3 == readl_relaxed(&device_data->base->periphid3) &&
+ HASH_CELL_ID0 == readl_relaxed(&device_data->base->cellid0) &&
+ HASH_CELL_ID1 == readl_relaxed(&device_data->base->cellid1) &&
+ HASH_CELL_ID2 == readl_relaxed(&device_data->base->cellid2) &&
+ HASH_CELL_ID3 == readl_relaxed(&device_data->base->cellid3)) {
+ return 0;
+ }
+
+ dev_err(device_data->dev, "%s: HASH_UNSUPPORTED_HW!\n", __func__);
+ return -ENOTSUPP;
+}
+
+/**
+ * hash_get_digest - Gets the digest.
+ * @device_data: Pointer to the device structure.
+ * @digest: User allocated byte array for the calculated digest.
+ * @algorithm: The algorithm in use.
+ */
+void hash_get_digest(struct hash_device_data *device_data,
+ u8 *digest, int algorithm)
+{
+ u32 temp_hx_val, count;
+ int loop_ctr;
+
+ if (algorithm != HASH_ALGO_SHA1 && algorithm != HASH_ALGO_SHA256) {
+ dev_err(device_data->dev, "%s: Incorrect algorithm %d\n",
+ __func__, algorithm);
+ return;
+ }
+
+ if (algorithm == HASH_ALGO_SHA1)
+ loop_ctr = SHA1_DIGEST_SIZE / sizeof(u32);
+ else
+ loop_ctr = SHA256_DIGEST_SIZE / sizeof(u32);
+
+ dev_dbg(device_data->dev, "%s: digest array:(0x%x)\n",
+ __func__, (u32) digest);
+
+ /* Copy result into digest array */
+ for (count = 0; count < loop_ctr; count++) {
+ temp_hx_val = readl_relaxed(&device_data->base->hx[count]);
+ digest[count * 4] = (u8) ((temp_hx_val >> 24) & 0xFF);
+ digest[count * 4 + 1] = (u8) ((temp_hx_val >> 16) & 0xFF);
+ digest[count * 4 + 2] = (u8) ((temp_hx_val >> 8) & 0xFF);
+ digest[count * 4 + 3] = (u8) ((temp_hx_val >> 0) & 0xFF);
+ }
+}
+
+/**
+ * hash_update - The hash update function for SHA1/SHA2 (SHA256).
+ * @req: The hash request for the job.
+ */
+static int ahash_update(struct ahash_request *req)
+{
+ int ret = 0;
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+
+ if (hash_mode != HASH_MODE_DMA || !req_ctx->dma_mode)
+ ret = hash_hw_update(req);
+ /* Skip update for DMA, all data will be passed to DMA in final */
+
+ if (ret) {
+ pr_err("%s: hash_hw_update() failed!\n", __func__);
+ }
+
+ return ret;
+}
+
+/**
+ * hash_final - The hash final function for SHA1/SHA2 (SHA256).
+ * @req: The hash request for the job.
+ */
+static int ahash_final(struct ahash_request *req)
+{
+ int ret = 0;
+ struct hash_req_ctx *req_ctx = ahash_request_ctx(req);
+
+ pr_debug("%s: data size: %d\n", __func__, req->nbytes);
+
+ if ((hash_mode == HASH_MODE_DMA) && req_ctx->dma_mode)
+ ret = hash_dma_final(req);
+ else
+ ret = hash_hw_final(req);
+
+ if (ret) {
+ pr_err("%s: hash_hw/dma_final() failed\n", __func__);
+ }
+
+ return ret;
+}
+
+static int hash_setkey(struct crypto_ahash *tfm,
+ const u8 *key, unsigned int keylen, int alg)
+{
+ int ret = 0;
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+
+ /**
+ * Freed in final.
+ */
+ ctx->key = kmemdup(key, keylen, GFP_KERNEL);
+ if (!ctx->key) {
+ pr_err("%s: Failed to allocate ctx->key for %d\n",
+ __func__, alg);
+ return -ENOMEM;
+ }
+ ctx->keylen = keylen;
+
+ return ret;
+}
+
+static int ahash_sha1_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+
+ ctx->config.data_format = HASH_DATA_8_BITS;
+ ctx->config.algorithm = HASH_ALGO_SHA1;
+ ctx->config.oper_mode = HASH_OPER_MODE_HASH;
+ ctx->digestsize = SHA1_DIGEST_SIZE;
+
+ return hash_init(req);
+}
+
+static int ahash_sha256_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+
+ ctx->config.data_format = HASH_DATA_8_BITS;
+ ctx->config.algorithm = HASH_ALGO_SHA256;
+ ctx->config.oper_mode = HASH_OPER_MODE_HASH;
+ ctx->digestsize = SHA256_DIGEST_SIZE;
+
+ return hash_init(req);
+}
+
+static int ahash_sha1_digest(struct ahash_request *req)
+{
+ int ret2, ret1;
+
+ ret1 = ahash_sha1_init(req);
+ if (ret1)
+ goto out;
+
+ ret1 = ahash_update(req);
+ ret2 = ahash_final(req);
+
+out:
+ return ret1 ? ret1 : ret2;
+}
+
+static int ahash_sha256_digest(struct ahash_request *req)
+{
+ int ret2, ret1;
+
+ ret1 = ahash_sha256_init(req);
+ if (ret1)
+ goto out;
+
+ ret1 = ahash_update(req);
+ ret2 = ahash_final(req);
+
+out:
+ return ret1 ? ret1 : ret2;
+}
+
+static int hmac_sha1_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+
+ ctx->config.data_format = HASH_DATA_8_BITS;
+ ctx->config.algorithm = HASH_ALGO_SHA1;
+ ctx->config.oper_mode = HASH_OPER_MODE_HMAC;
+ ctx->digestsize = SHA1_DIGEST_SIZE;
+
+ return hash_init(req);
+}
+
+static int hmac_sha256_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct hash_ctx *ctx = crypto_ahash_ctx(tfm);
+
+ ctx->config.data_format = HASH_DATA_8_BITS;
+ ctx->config.algorithm = HASH_ALGO_SHA256;
+ ctx->config.oper_mode = HASH_OPER_MODE_HMAC;
+ ctx->digestsize = SHA256_DIGEST_SIZE;
+
+ return hash_init(req);
+}
+
+static int hmac_sha1_digest(struct ahash_request *req)
+{
+ int ret2, ret1;
+
+ ret1 = hmac_sha1_init(req);
+ if (ret1)
+ goto out;
+
+ ret1 = ahash_update(req);
+ ret2 = ahash_final(req);
+
+out:
+ return ret1 ? ret1 : ret2;
+}
+
+static int hmac_sha256_digest(struct ahash_request *req)
+{
+ int ret2, ret1;
+
+ ret1 = hmac_sha256_init(req);
+ if (ret1)
+ goto out;
+
+ ret1 = ahash_update(req);
+ ret2 = ahash_final(req);
+
+out:
+ return ret1 ? ret1 : ret2;
+}
+
+static int hmac_sha1_setkey(struct crypto_ahash *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ return hash_setkey(tfm, key, keylen, HASH_ALGO_SHA1);
+}
+
+static int hmac_sha256_setkey(struct crypto_ahash *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ return hash_setkey(tfm, key, keylen, HASH_ALGO_SHA256);
+}
+
+struct hash_algo_template {
+ struct hash_config conf;
+ struct ahash_alg hash;
+};
+
+static int hash_cra_init(struct crypto_tfm *tfm)
+{
+ struct hash_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_alg *alg = tfm->__crt_alg;
+ struct hash_algo_template *hash_alg;
+
+ hash_alg = container_of(__crypto_ahash_alg(alg),
+ struct hash_algo_template,
+ hash);
+
+ crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+ sizeof(struct hash_req_ctx));
+
+ ctx->config.data_format = HASH_DATA_8_BITS;
+ ctx->config.algorithm = hash_alg->conf.algorithm;
+ ctx->config.oper_mode = hash_alg->conf.oper_mode;
+
+ ctx->digestsize = hash_alg->hash.halg.digestsize;
+
+ return 0;
+}
+
+static struct hash_algo_template hash_algs[] = {
+ {
+ .conf.algorithm = HASH_ALGO_SHA1,
+ .conf.oper_mode = HASH_OPER_MODE_HASH,
+ .hash = {
+ .init = hash_init,
+ .update = ahash_update,
+ .final = ahash_final,
+ .digest = ahash_sha1_digest,
+ .halg.digestsize = SHA1_DIGEST_SIZE,
+ .halg.statesize = sizeof(struct hash_ctx),
+ .halg.base = {
+ .cra_name = "sha1",
+ .cra_driver_name = "sha1-ux500",
+ .cra_flags = (CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC),
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct hash_ctx),
+ .cra_init = hash_cra_init,
+ .cra_module = THIS_MODULE,
+ }
+ }
+ },
+ {
+ .conf.algorithm = HASH_ALGO_SHA256,
+ .conf.oper_mode = HASH_OPER_MODE_HASH,
+ .hash = {
+ .init = hash_init,
+ .update = ahash_update,
+ .final = ahash_final,
+ .digest = ahash_sha256_digest,
+ .halg.digestsize = SHA256_DIGEST_SIZE,
+ .halg.statesize = sizeof(struct hash_ctx),
+ .halg.base = {
+ .cra_name = "sha256",
+ .cra_driver_name = "sha256-ux500",
+ .cra_flags = (CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC),
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct hash_ctx),
+ .cra_type = &crypto_ahash_type,
+ .cra_init = hash_cra_init,
+ .cra_module = THIS_MODULE,
+ }
+ }
+ },
+ {
+ .conf.algorithm = HASH_ALGO_SHA1,
+ .conf.oper_mode = HASH_OPER_MODE_HMAC,
+ .hash = {
+ .init = hash_init,
+ .update = ahash_update,
+ .final = ahash_final,
+ .digest = hmac_sha1_digest,
+ .setkey = hmac_sha1_setkey,
+ .halg.digestsize = SHA1_DIGEST_SIZE,
+ .halg.statesize = sizeof(struct hash_ctx),
+ .halg.base = {
+ .cra_name = "hmac(sha1)",
+ .cra_driver_name = "hmac-sha1-ux500",
+ .cra_flags = (CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC),
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct hash_ctx),
+ .cra_type = &crypto_ahash_type,
+ .cra_init = hash_cra_init,
+ .cra_module = THIS_MODULE,
+ }
+ }
+ },
+ {
+ .conf.algorithm = HASH_ALGO_SHA256,
+ .conf.oper_mode = HASH_OPER_MODE_HMAC,
+ .hash = {
+ .init = hash_init,
+ .update = ahash_update,
+ .final = ahash_final,
+ .digest = hmac_sha256_digest,
+ .setkey = hmac_sha256_setkey,
+ .halg.digestsize = SHA256_DIGEST_SIZE,
+ .halg.statesize = sizeof(struct hash_ctx),
+ .halg.base = {
+ .cra_name = "hmac(sha256)",
+ .cra_driver_name = "hmac-sha256-ux500",
+ .cra_flags = (CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC),
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct hash_ctx),
+ .cra_type = &crypto_ahash_type,
+ .cra_init = hash_cra_init,
+ .cra_module = THIS_MODULE,
+ }
+ }
+ }
+};
+
+/**
+ * hash_algs_register_all -
+ */
+static int ahash_algs_register_all(struct hash_device_data *device_data)
+{
+ int ret;
+ int i;
+ int count;
+
+ for (i = 0; i < ARRAY_SIZE(hash_algs); i++) {
+ ret = crypto_register_ahash(&hash_algs[i].hash);
+ if (ret) {
+ count = i;
+ dev_err(device_data->dev, "%s: alg registration failed\n",
+ hash_algs[i].hash.halg.base.cra_driver_name);
+ goto unreg;
+ }
+ }
+ return 0;
+unreg:
+ for (i = 0; i < count; i++)
+ crypto_unregister_ahash(&hash_algs[i].hash);
+ return ret;
+}
+
+/**
+ * hash_algs_unregister_all -
+ */
+static void ahash_algs_unregister_all(struct hash_device_data *device_data)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(hash_algs); i++)
+ crypto_unregister_ahash(&hash_algs[i].hash);
+}
+
+/**
+ * ux500_hash_probe - Function that probes the hash hardware.
+ * @pdev: The platform device.
+ */
+static int ux500_hash_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct resource *res = NULL;
+ struct hash_device_data *device_data;
+ struct device *dev = &pdev->dev;
+
+ device_data = kzalloc(sizeof(*device_data), GFP_ATOMIC);
+ if (!device_data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ device_data->dev = dev;
+ device_data->current_ctx = NULL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_dbg(dev, "%s: platform_get_resource() failed!\n", __func__);
+ ret = -ENODEV;
+ goto out_kfree;
+ }
+
+ res = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (res == NULL) {
+ dev_dbg(dev, "%s: request_mem_region() failed!\n", __func__);
+ ret = -EBUSY;
+ goto out_kfree;
+ }
+
+ device_data->phybase = res->start;
+ device_data->base = ioremap(res->start, resource_size(res));
+ if (!device_data->base) {
+ dev_err(dev, "%s: ioremap() failed!\n", __func__);
+ ret = -ENOMEM;
+ goto out_free_mem;
+ }
+ spin_lock_init(&device_data->ctx_lock);
+ spin_lock_init(&device_data->power_state_lock);
+
+ /* Enable power for HASH1 hardware block */
+ device_data->regulator = regulator_get(dev, "v-ape");
+ if (IS_ERR(device_data->regulator)) {
+ dev_err(dev, "%s: regulator_get() failed!\n", __func__);
+ ret = PTR_ERR(device_data->regulator);
+ device_data->regulator = NULL;
+ goto out_unmap;
+ }
+
+ /* Enable the clock for HASH1 hardware block */
+ device_data->clk = clk_get(dev, NULL);
+ if (IS_ERR(device_data->clk)) {
+ dev_err(dev, "%s: clk_get() failed!\n", __func__);
+ ret = PTR_ERR(device_data->clk);
+ goto out_regulator;
+ }
+
+ ret = clk_prepare(device_data->clk);
+ if (ret) {
+ dev_err(dev, "%s: clk_prepare() failed!\n", __func__);
+ goto out_clk;
+ }
+
+ /* Enable device power (and clock) */
+ ret = hash_enable_power(device_data, false);
+ if (ret) {
+ dev_err(dev, "%s: hash_enable_power() failed!\n", __func__);
+ goto out_clk_unprepare;
+ }
+
+ ret = hash_check_hw(device_data);
+ if (ret) {
+ dev_err(dev, "%s: hash_check_hw() failed!\n", __func__);
+ goto out_power;
+ }
+
+ if (hash_mode == HASH_MODE_DMA)
+ hash_dma_setup_channel(device_data, dev);
+
+ platform_set_drvdata(pdev, device_data);
+
+ /* Put the new device into the device list... */
+ klist_add_tail(&device_data->list_node, &driver_data.device_list);
+ /* ... and signal that a new device is available. */
+ up(&driver_data.device_allocation);
+
+ ret = ahash_algs_register_all(device_data);
+ if (ret) {
+ dev_err(dev, "%s: ahash_algs_register_all() failed!\n",
+ __func__);
+ goto out_power;
+ }
+
+ dev_info(dev, "successfully registered\n");
+ return 0;
+
+out_power:
+ hash_disable_power(device_data, false);
+
+out_clk_unprepare:
+ clk_unprepare(device_data->clk);
+
+out_clk:
+ clk_put(device_data->clk);
+
+out_regulator:
+ regulator_put(device_data->regulator);
+
+out_unmap:
+ iounmap(device_data->base);
+
+out_free_mem:
+ release_mem_region(res->start, resource_size(res));
+
+out_kfree:
+ kfree(device_data);
+out:
+ return ret;
+}
+
+/**
+ * ux500_hash_remove - Function that removes the hash device from the platform.
+ * @pdev: The platform device.
+ */
+static int ux500_hash_remove(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct hash_device_data *device_data;
+ struct device *dev = &pdev->dev;
+
+ device_data = platform_get_drvdata(pdev);
+ if (!device_data) {
+ dev_err(dev, "%s: platform_get_drvdata() failed!\n", __func__);
+ return -ENOMEM;
+ }
+
+ /* Try to decrease the number of available devices. */
+ if (down_trylock(&driver_data.device_allocation))
+ return -EBUSY;
+
+ /* Check that the device is free */
+ spin_lock(&device_data->ctx_lock);
+ /* current_ctx allocates a device, NULL = unallocated */
+ if (device_data->current_ctx) {
+ /* The device is busy */
+ spin_unlock(&device_data->ctx_lock);
+ /* Return the device to the pool. */
+ up(&driver_data.device_allocation);
+ return -EBUSY;
+ }
+
+ spin_unlock(&device_data->ctx_lock);
+
+ /* Remove the device from the list */
+ if (klist_node_attached(&device_data->list_node))
+ klist_remove(&device_data->list_node);
+
+ /* If this was the last device, remove the services */
+ if (list_empty(&driver_data.device_list.k_list))
+ ahash_algs_unregister_all(device_data);
+
+ if (hash_disable_power(device_data, false))
+ dev_err(dev, "%s: hash_disable_power() failed\n",
+ __func__);
+
+ clk_unprepare(device_data->clk);
+ clk_put(device_data->clk);
+ regulator_put(device_data->regulator);
+
+ iounmap(device_data->base);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res)
+ release_mem_region(res->start, resource_size(res));
+
+ kfree(device_data);
+
+ return 0;
+}
+
+/**
+ * ux500_hash_shutdown - Function that shutdown the hash device.
+ * @pdev: The platform device
+ */
+static void ux500_hash_shutdown(struct platform_device *pdev)
+{
+ struct resource *res = NULL;
+ struct hash_device_data *device_data;
+
+ device_data = platform_get_drvdata(pdev);
+ if (!device_data) {
+ dev_err(&pdev->dev, "%s: platform_get_drvdata() failed!\n",
+ __func__);
+ return;
+ }
+
+ /* Check that the device is free */
+ spin_lock(&device_data->ctx_lock);
+ /* current_ctx allocates a device, NULL = unallocated */
+ if (!device_data->current_ctx) {
+ if (down_trylock(&driver_data.device_allocation))
+ dev_dbg(&pdev->dev, "%s: Cryp still in use! Shutting down anyway...\n",
+ __func__);
+ /**
+ * (Allocate the device)
+ * Need to set this to non-null (dummy) value,
+ * to avoid usage if context switching.
+ */
+ device_data->current_ctx++;
+ }
+ spin_unlock(&device_data->ctx_lock);
+
+ /* Remove the device from the list */
+ if (klist_node_attached(&device_data->list_node))
+ klist_remove(&device_data->list_node);
+
+ /* If this was the last device, remove the services */
+ if (list_empty(&driver_data.device_list.k_list))
+ ahash_algs_unregister_all(device_data);
+
+ iounmap(device_data->base);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res)
+ release_mem_region(res->start, resource_size(res));
+
+ if (hash_disable_power(device_data, false))
+ dev_err(&pdev->dev, "%s: hash_disable_power() failed\n",
+ __func__);
+}
+
+#ifdef CONFIG_PM_SLEEP
+/**
+ * ux500_hash_suspend - Function that suspends the hash device.
+ * @dev: Device to suspend.
+ */
+static int ux500_hash_suspend(struct device *dev)
+{
+ int ret;
+ struct hash_device_data *device_data;
+ struct hash_ctx *temp_ctx = NULL;
+
+ device_data = dev_get_drvdata(dev);
+ if (!device_data) {
+ dev_err(dev, "%s: platform_get_drvdata() failed!\n", __func__);
+ return -ENOMEM;
+ }
+
+ spin_lock(&device_data->ctx_lock);
+ if (!device_data->current_ctx)
+ device_data->current_ctx++;
+ spin_unlock(&device_data->ctx_lock);
+
+ if (device_data->current_ctx == ++temp_ctx) {
+ if (down_interruptible(&driver_data.device_allocation))
+ dev_dbg(dev, "%s: down_interruptible() failed\n",
+ __func__);
+ ret = hash_disable_power(device_data, false);
+
+ } else {
+ ret = hash_disable_power(device_data, true);
+ }
+
+ if (ret)
+ dev_err(dev, "%s: hash_disable_power()\n", __func__);
+
+ return ret;
+}
+
+/**
+ * ux500_hash_resume - Function that resume the hash device.
+ * @dev: Device to resume.
+ */
+static int ux500_hash_resume(struct device *dev)
+{
+ int ret = 0;
+ struct hash_device_data *device_data;
+ struct hash_ctx *temp_ctx = NULL;
+
+ device_data = dev_get_drvdata(dev);
+ if (!device_data) {
+ dev_err(dev, "%s: platform_get_drvdata() failed!\n", __func__);
+ return -ENOMEM;
+ }
+
+ spin_lock(&device_data->ctx_lock);
+ if (device_data->current_ctx == ++temp_ctx)
+ device_data->current_ctx = NULL;
+ spin_unlock(&device_data->ctx_lock);
+
+ if (!device_data->current_ctx)
+ up(&driver_data.device_allocation);
+ else
+ ret = hash_enable_power(device_data, true);
+
+ if (ret)
+ dev_err(dev, "%s: hash_enable_power() failed!\n", __func__);
+
+ return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(ux500_hash_pm, ux500_hash_suspend, ux500_hash_resume);
+
+static const struct of_device_id ux500_hash_match[] = {
+ { .compatible = "stericsson,ux500-hash" },
+ { },
+};
+
+static struct platform_driver hash_driver = {
+ .probe = ux500_hash_probe,
+ .remove = ux500_hash_remove,
+ .shutdown = ux500_hash_shutdown,
+ .driver = {
+ .name = "hash1",
+ .of_match_table = ux500_hash_match,
+ .pm = &ux500_hash_pm,
+ }
+};
+
+/**
+ * ux500_hash_mod_init - The kernel module init function.
+ */
+static int __init ux500_hash_mod_init(void)
+{
+ klist_init(&driver_data.device_list, NULL, NULL);
+ /* Initialize the semaphore to 0 devices (locked state) */
+ sema_init(&driver_data.device_allocation, 0);
+
+ return platform_driver_register(&hash_driver);
+}
+
+/**
+ * ux500_hash_mod_fini - The kernel module exit function.
+ */
+static void __exit ux500_hash_mod_fini(void)
+{
+ platform_driver_unregister(&hash_driver);
+}
+
+module_init(ux500_hash_mod_init);
+module_exit(ux500_hash_mod_fini);
+
+MODULE_DESCRIPTION("Driver for ST-Ericsson UX500 HASH engine.");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_CRYPTO("sha1-all");
+MODULE_ALIAS_CRYPTO("sha256-all");
+MODULE_ALIAS_CRYPTO("hmac-sha1-all");
+MODULE_ALIAS_CRYPTO("hmac-sha256-all");
Code Review / kvmfornfv.git / blobdiff