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path: root/drivers/crypto/ux500/cryp/cryp.c
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Diffstat (limited to 'drivers/crypto/ux500/cryp/cryp.c')
-rw-r--r--drivers/crypto/ux500/cryp/cryp.c387
1 files changed, 387 insertions, 0 deletions
diff --git a/drivers/crypto/ux500/cryp/cryp.c b/drivers/crypto/ux500/cryp/cryp.c
new file mode 100644
index 000000000..00a16ab60
--- /dev/null
+++ b/drivers/crypto/ux500/cryp/cryp.c
@@ -0,0 +1,387 @@
+/**
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Shujuan Chen <shujuan.chen@stericsson.com> for ST-Ericsson.
+ * Author: Jonas Linde <jonas.linde@stericsson.com> for ST-Ericsson.
+ * Author: Niklas Hernaeus <niklas.hernaeus@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.
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include "cryp_p.h"
+#include "cryp.h"
+
+/**
+ * cryp_wait_until_done - wait until the device logic is not busy
+ */
+void cryp_wait_until_done(struct cryp_device_data *device_data)
+{
+ while (cryp_is_logic_busy(device_data))
+ cpu_relax();
+}
+
+/**
+ * cryp_check - This routine checks Peripheral and PCell Id
+ * @device_data: Pointer to the device data struct for base address.
+ */
+int cryp_check(struct cryp_device_data *device_data)
+{
+ int peripheralid2 = 0;
+
+ if (NULL == device_data)
+ return -EINVAL;
+
+ peripheralid2 = readl_relaxed(&device_data->base->periphId2);
+
+ if (peripheralid2 != CRYP_PERIPHERAL_ID2_DB8500)
+ return -EPERM;
+
+ /* Check Peripheral and Pcell Id Register for CRYP */
+ if ((CRYP_PERIPHERAL_ID0 ==
+ readl_relaxed(&device_data->base->periphId0))
+ && (CRYP_PERIPHERAL_ID1 ==
+ readl_relaxed(&device_data->base->periphId1))
+ && (CRYP_PERIPHERAL_ID3 ==
+ readl_relaxed(&device_data->base->periphId3))
+ && (CRYP_PCELL_ID0 ==
+ readl_relaxed(&device_data->base->pcellId0))
+ && (CRYP_PCELL_ID1 ==
+ readl_relaxed(&device_data->base->pcellId1))
+ && (CRYP_PCELL_ID2 ==
+ readl_relaxed(&device_data->base->pcellId2))
+ && (CRYP_PCELL_ID3 ==
+ readl_relaxed(&device_data->base->pcellId3))) {
+ return 0;
+ }
+
+ return -EPERM;
+}
+
+/**
+ * cryp_activity - This routine enables/disable the cryptography function.
+ * @device_data: Pointer to the device data struct for base address.
+ * @cryp_crypen: Enable/Disable functionality
+ */
+void cryp_activity(struct cryp_device_data *device_data,
+ enum cryp_crypen cryp_crypen)
+{
+ CRYP_PUT_BITS(&device_data->base->cr,
+ cryp_crypen,
+ CRYP_CR_CRYPEN_POS,
+ CRYP_CR_CRYPEN_MASK);
+}
+
+/**
+ * cryp_flush_inoutfifo - Resets both the input and the output FIFOs
+ * @device_data: Pointer to the device data struct for base address.
+ */
+void cryp_flush_inoutfifo(struct cryp_device_data *device_data)
+{
+ /*
+ * We always need to disable the hardware before trying to flush the
+ * FIFO. This is something that isn't written in the design
+ * specification, but we have been informed by the hardware designers
+ * that this must be done.
+ */
+ cryp_activity(device_data, CRYP_CRYPEN_DISABLE);
+ cryp_wait_until_done(device_data);
+
+ CRYP_SET_BITS(&device_data->base->cr, CRYP_CR_FFLUSH_MASK);
+ /*
+ * CRYP_SR_INFIFO_READY_MASK is the expected value on the status
+ * register when starting a new calculation, which means Input FIFO is
+ * not full and input FIFO is empty.
+ */
+ while (readl_relaxed(&device_data->base->sr) !=
+ CRYP_SR_INFIFO_READY_MASK)
+ cpu_relax();
+}
+
+/**
+ * cryp_set_configuration - This routine set the cr CRYP IP
+ * @device_data: Pointer to the device data struct for base address.
+ * @cryp_config: Pointer to the configuration parameter
+ * @control_register: The control register to be written later on.
+ */
+int cryp_set_configuration(struct cryp_device_data *device_data,
+ struct cryp_config *cryp_config,
+ u32 *control_register)
+{
+ u32 cr_for_kse;
+
+ if (NULL == device_data || NULL == cryp_config)
+ return -EINVAL;
+
+ *control_register |= (cryp_config->keysize << CRYP_CR_KEYSIZE_POS);
+
+ /* Prepare key for decryption in AES_ECB and AES_CBC mode. */
+ if ((CRYP_ALGORITHM_DECRYPT == cryp_config->algodir) &&
+ ((CRYP_ALGO_AES_ECB == cryp_config->algomode) ||
+ (CRYP_ALGO_AES_CBC == cryp_config->algomode))) {
+ cr_for_kse = *control_register;
+ /*
+ * This seems a bit odd, but it is indeed needed to set this to
+ * encrypt even though it is a decryption that we are doing. It
+ * also mentioned in the design spec that you need to do this.
+ * After the keyprepartion for decrypting is done you should set
+ * algodir back to decryption, which is done outside this if
+ * statement.
+ *
+ * According to design specification we should set mode ECB
+ * during key preparation even though we might be running CBC
+ * when enter this function.
+ *
+ * Writing to KSE_ENABLED will drop CRYPEN when key preparation
+ * is done. Therefore we need to set CRYPEN again outside this
+ * if statement when running decryption.
+ */
+ cr_for_kse |= ((CRYP_ALGORITHM_ENCRYPT << CRYP_CR_ALGODIR_POS) |
+ (CRYP_ALGO_AES_ECB << CRYP_CR_ALGOMODE_POS) |
+ (CRYP_CRYPEN_ENABLE << CRYP_CR_CRYPEN_POS) |
+ (KSE_ENABLED << CRYP_CR_KSE_POS));
+
+ writel_relaxed(cr_for_kse, &device_data->base->cr);
+ cryp_wait_until_done(device_data);
+ }
+
+ *control_register |=
+ ((cryp_config->algomode << CRYP_CR_ALGOMODE_POS) |
+ (cryp_config->algodir << CRYP_CR_ALGODIR_POS));
+
+ return 0;
+}
+
+/**
+ * cryp_configure_protection - set the protection bits in the CRYP logic.
+ * @device_data: Pointer to the device data struct for base address.
+ * @p_protect_config: Pointer to the protection mode and
+ * secure mode configuration
+ */
+int cryp_configure_protection(struct cryp_device_data *device_data,
+ struct cryp_protection_config *p_protect_config)
+{
+ if (NULL == p_protect_config)
+ return -EINVAL;
+
+ CRYP_WRITE_BIT(&device_data->base->cr,
+ (u32) p_protect_config->secure_access,
+ CRYP_CR_SECURE_MASK);
+ CRYP_PUT_BITS(&device_data->base->cr,
+ p_protect_config->privilege_access,
+ CRYP_CR_PRLG_POS,
+ CRYP_CR_PRLG_MASK);
+
+ return 0;
+}
+
+/**
+ * cryp_is_logic_busy - returns the busy status of the CRYP logic
+ * @device_data: Pointer to the device data struct for base address.
+ */
+int cryp_is_logic_busy(struct cryp_device_data *device_data)
+{
+ return CRYP_TEST_BITS(&device_data->base->sr,
+ CRYP_SR_BUSY_MASK);
+}
+
+/**
+ * cryp_configure_for_dma - configures the CRYP IP for DMA operation
+ * @device_data: Pointer to the device data struct for base address.
+ * @dma_req: Specifies the DMA request type value.
+ */
+void cryp_configure_for_dma(struct cryp_device_data *device_data,
+ enum cryp_dma_req_type dma_req)
+{
+ CRYP_SET_BITS(&device_data->base->dmacr,
+ (u32) dma_req);
+}
+
+/**
+ * cryp_configure_key_values - configures the key values for CRYP operations
+ * @device_data: Pointer to the device data struct for base address.
+ * @key_reg_index: Key value index register
+ * @key_value: The key value struct
+ */
+int cryp_configure_key_values(struct cryp_device_data *device_data,
+ enum cryp_key_reg_index key_reg_index,
+ struct cryp_key_value key_value)
+{
+ while (cryp_is_logic_busy(device_data))
+ cpu_relax();
+
+ switch (key_reg_index) {
+ case CRYP_KEY_REG_1:
+ writel_relaxed(key_value.key_value_left,
+ &device_data->base->key_1_l);
+ writel_relaxed(key_value.key_value_right,
+ &device_data->base->key_1_r);
+ break;
+ case CRYP_KEY_REG_2:
+ writel_relaxed(key_value.key_value_left,
+ &device_data->base->key_2_l);
+ writel_relaxed(key_value.key_value_right,
+ &device_data->base->key_2_r);
+ break;
+ case CRYP_KEY_REG_3:
+ writel_relaxed(key_value.key_value_left,
+ &device_data->base->key_3_l);
+ writel_relaxed(key_value.key_value_right,
+ &device_data->base->key_3_r);
+ break;
+ case CRYP_KEY_REG_4:
+ writel_relaxed(key_value.key_value_left,
+ &device_data->base->key_4_l);
+ writel_relaxed(key_value.key_value_right,
+ &device_data->base->key_4_r);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * cryp_configure_init_vector - configures the initialization vector register
+ * @device_data: Pointer to the device data struct for base address.
+ * @init_vector_index: Specifies the index of the init vector.
+ * @init_vector_value: Specifies the value for the init vector.
+ */
+int cryp_configure_init_vector(struct cryp_device_data *device_data,
+ enum cryp_init_vector_index
+ init_vector_index,
+ struct cryp_init_vector_value
+ init_vector_value)
+{
+ while (cryp_is_logic_busy(device_data))
+ cpu_relax();
+
+ switch (init_vector_index) {
+ case CRYP_INIT_VECTOR_INDEX_0:
+ writel_relaxed(init_vector_value.init_value_left,
+ &device_data->base->init_vect_0_l);
+ writel_relaxed(init_vector_value.init_value_right,
+ &device_data->base->init_vect_0_r);
+ break;
+ case CRYP_INIT_VECTOR_INDEX_1:
+ writel_relaxed(init_vector_value.init_value_left,
+ &device_data->base->init_vect_1_l);
+ writel_relaxed(init_vector_value.init_value_right,
+ &device_data->base->init_vect_1_r);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * cryp_save_device_context - Store hardware registers and
+ * other device context parameter
+ * @device_data: Pointer to the device data struct for base address.
+ * @ctx: Crypto device context
+ */
+void cryp_save_device_context(struct cryp_device_data *device_data,
+ struct cryp_device_context *ctx,
+ int cryp_mode)
+{
+ enum cryp_algo_mode algomode;
+ struct cryp_register __iomem *src_reg = device_data->base;
+ struct cryp_config *config =
+ (struct cryp_config *)device_data->current_ctx;
+
+ /*
+ * Always start by disable the hardware and wait for it to finish the
+ * ongoing calculations before trying to reprogram it.
+ */
+ cryp_activity(device_data, CRYP_CRYPEN_DISABLE);
+ cryp_wait_until_done(device_data);
+
+ if (cryp_mode == CRYP_MODE_DMA)
+ cryp_configure_for_dma(device_data, CRYP_DMA_DISABLE_BOTH);
+
+ if (CRYP_TEST_BITS(&src_reg->sr, CRYP_SR_IFEM_MASK) == 0)
+ ctx->din = readl_relaxed(&src_reg->din);
+
+ ctx->cr = readl_relaxed(&src_reg->cr) & CRYP_CR_CONTEXT_SAVE_MASK;
+
+ switch (config->keysize) {
+ case CRYP_KEY_SIZE_256:
+ ctx->key_4_l = readl_relaxed(&src_reg->key_4_l);
+ ctx->key_4_r = readl_relaxed(&src_reg->key_4_r);
+
+ case CRYP_KEY_SIZE_192:
+ ctx->key_3_l = readl_relaxed(&src_reg->key_3_l);
+ ctx->key_3_r = readl_relaxed(&src_reg->key_3_r);
+
+ case CRYP_KEY_SIZE_128:
+ ctx->key_2_l = readl_relaxed(&src_reg->key_2_l);
+ ctx->key_2_r = readl_relaxed(&src_reg->key_2_r);
+
+ default:
+ ctx->key_1_l = readl_relaxed(&src_reg->key_1_l);
+ ctx->key_1_r = readl_relaxed(&src_reg->key_1_r);
+ }
+
+ /* Save IV for CBC mode for both AES and DES. */
+ algomode = ((ctx->cr & CRYP_CR_ALGOMODE_MASK) >> CRYP_CR_ALGOMODE_POS);
+ if (algomode == CRYP_ALGO_TDES_CBC ||
+ algomode == CRYP_ALGO_DES_CBC ||
+ algomode == CRYP_ALGO_AES_CBC) {
+ ctx->init_vect_0_l = readl_relaxed(&src_reg->init_vect_0_l);
+ ctx->init_vect_0_r = readl_relaxed(&src_reg->init_vect_0_r);
+ ctx->init_vect_1_l = readl_relaxed(&src_reg->init_vect_1_l);
+ ctx->init_vect_1_r = readl_relaxed(&src_reg->init_vect_1_r);
+ }
+}
+
+/**
+ * cryp_restore_device_context - Restore hardware registers and
+ * other device context parameter
+ * @device_data: Pointer to the device data struct for base address.
+ * @ctx: Crypto device context
+ */
+void cryp_restore_device_context(struct cryp_device_data *device_data,
+ struct cryp_device_context *ctx)
+{
+ struct cryp_register __iomem *reg = device_data->base;
+ struct cryp_config *config =
+ (struct cryp_config *)device_data->current_ctx;
+
+ /*
+ * Fall through for all items in switch statement. DES is captured in
+ * the default.
+ */
+ switch (config->keysize) {
+ case CRYP_KEY_SIZE_256:
+ writel_relaxed(ctx->key_4_l, &reg->key_4_l);
+ writel_relaxed(ctx->key_4_r, &reg->key_4_r);
+
+ case CRYP_KEY_SIZE_192:
+ writel_relaxed(ctx->key_3_l, &reg->key_3_l);
+ writel_relaxed(ctx->key_3_r, &reg->key_3_r);
+
+ case CRYP_KEY_SIZE_128:
+ writel_relaxed(ctx->key_2_l, &reg->key_2_l);
+ writel_relaxed(ctx->key_2_r, &reg->key_2_r);
+
+ default:
+ writel_relaxed(ctx->key_1_l, &reg->key_1_l);
+ writel_relaxed(ctx->key_1_r, &reg->key_1_r);
+ }
+
+ /* Restore IV for CBC mode for AES and DES. */
+ if (config->algomode == CRYP_ALGO_TDES_CBC ||
+ config->algomode == CRYP_ALGO_DES_CBC ||
+ config->algomode == CRYP_ALGO_AES_CBC) {
+ writel_relaxed(ctx->init_vect_0_l, &reg->init_vect_0_l);
+ writel_relaxed(ctx->init_vect_0_r, &reg->init_vect_0_r);
+ writel_relaxed(ctx->init_vect_1_l, &reg->init_vect_1_l);
+ writel_relaxed(ctx->init_vect_1_r, &reg->init_vect_1_r);
+ }
+}
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