+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
+ * Copyright (C) 2009 Mohammad Firdaus
+ */
+
+/*!
+ \defgroup IFX_DEU IFX_DEU_DRIVERS
+ \ingroup API
+ \brief deu driver module
+*/
+
+/*!
+ \file ifxmips_deu_danube.c
+ \ingroup IFX_DEU
+ \brief board specific deu driver file for danube
+*/
+
+/*!
+ \defgroup BOARD_SPECIFIC_FUNCTIONS IFX_BOARD_SPECIFIC_FUNCTIONS
+ \ingroup IFX_DEU
+ \brief board specific deu functions
+*/
+
+/* Project header files */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <asm/io.h> //dma_cache_inv
+#include "ifxmips_deu.h"
+
+#ifdef CONFIG_CRYPTO_DEV_IFXMIPS_DMA
+u32 *des_buff_in = NULL;
+u32 *des_buff_out = NULL;
+u32 *aes_buff_in = NULL;
+u32 *aes_buff_out = NULL;
+_ifx_deu_device ifx_deu[1];
+#endif
+
+/* Function Declerations */
+int aes_memory_allocate(int value);
+int des_memory_allocate(int value);
+void memory_release(u32 *addr);
+int aes_chip_init (void);
+void des_chip_init (void);
+int deu_dma_init (void);
+u32 endian_swap(u32 input);
+u32* memory_alignment(const u8 *arg, u32 *buff_alloc, int in_out, int nbytes);
+void dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes);
+void __exit ifxdeu_fini_dma(void);
+
+#define DES_3DES_START IFX_DES_CON
+#define AES_START IFX_AES_CON
+
+/* Variables definition */
+int ifx_danube_pre_1_4;
+u8 *g_dma_page_ptr = NULL;
+u8 *g_dma_block = NULL;
+u8 *g_dma_block2 = NULL;
+
+
+/*! \fn int deu_dma_init (void)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief Initialize DMA for DEU usage. DMA specific registers are
+ * intialized here, including a pointer to the device, memory
+ * space for the device and DEU-DMA descriptors
+ * \return -1 if fail, otherwise return 0
+*/
+
+#ifdef CONFIG_CRYPTO_DEV_IFXMIPS_DMA
+int deu_dma_init (void)
+{
+ struct dma_device_info *dma_device = NULL;
+ int i = 0;
+ volatile struct deu_dma_t *dma = (struct deu_dma_t *) IFX_DEU_DMA_CON;
+ struct dma_device_info *deu_dma_device_ptr;
+
+ // get one free page and share between g_dma_block and g_dma_block2
+ printk("PAGE_SIZE = %ld\n", PAGE_SIZE);
+ g_dma_page_ptr = (u8 *)__get_free_page(GFP_KERNEL); // need 16-byte alignment memory block
+ g_dma_block = g_dma_page_ptr; // need 16-byte alignment memory block
+ g_dma_block2 = (u8 *)(g_dma_page_ptr + (PAGE_SIZE >> 1)); // need 16-byte alignment memory block
+
+
+ deu_dma_device_ptr = dma_device_reserve ("DEU");
+ if (!deu_dma_device_ptr) {
+ printk ("DEU: reserve DMA fail!\n");
+ return -1;
+ }
+ ifx_deu[0].dma_device = deu_dma_device_ptr;
+ dma_device = deu_dma_device_ptr;
+ //dma_device->priv = &deu_dma_priv;
+ dma_device->buffer_alloc = &deu_dma_buffer_alloc;
+ dma_device->buffer_free = &deu_dma_buffer_free;
+ dma_device->intr_handler = &deu_dma_intr_handler;
+ dma_device->tx_endianness_mode = IFX_DMA_ENDIAN_TYPE3;
+ dma_device->rx_endianness_mode = IFX_DMA_ENDIAN_TYPE3;
+ dma_device->port_num = 1;
+ dma_device->tx_burst_len = 4;
+ dma_device->max_rx_chan_num = 1;
+ dma_device->max_tx_chan_num = 1;
+ dma_device->port_packet_drop_enable = 0;
+
+ for (i = 0; i < dma_device->max_rx_chan_num; i++) {
+ dma_device->rx_chan[i]->packet_size = DEU_MAX_PACKET_SIZE;
+ dma_device->rx_chan[i]->desc_len = 1;
+ dma_device->rx_chan[i]->control = IFX_DMA_CH_ON;
+ dma_device->rx_chan[i]->byte_offset = 0;
+ dma_device->rx_chan[i]->chan_poll_enable = 1;
+
+ }
+
+ for (i = 0; i < dma_device->max_tx_chan_num; i++) {
+ dma_device->tx_chan[i]->control = IFX_DMA_CH_ON;
+ dma_device->tx_chan[i]->desc_len = 1;
+ dma_device->tx_chan[i]->chan_poll_enable = 1;
+ }
+
+ dma_device->current_tx_chan = 0;
+ dma_device->current_rx_chan = 0;
+
+ dma_device_register (dma_device);
+ for (i = 0; i < dma_device->max_rx_chan_num; i++) {
+ (dma_device->rx_chan[i])->open (dma_device->rx_chan[i]);
+ }
+
+ dma->controlr.BS = 0;
+ dma->controlr.RXCLS = 0;
+ dma->controlr.EN = 1;
+
+
+ *IFX_DMA_PS = 1;
+
+ /* DANUBE PRE 1.4 SOFTWARE FIX */
+ if (ifx_danube_pre_1_4)
+ *IFX_DMA_PCTRL = 0x14;
+ else
+ *IFX_DMA_PCTRL = 0xF14;
+
+ return 0;
+}
+
+/*! \fn u32 *memory_alignment(const u8 *arg, u32 *buffer_alloc, int in_buff, int nbytes)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief A fix to align mis-aligned address for Danube version 1.3 chips which has
+ * memory alignment issues.
+ * \param arg Pointer to the input / output memory address
+ * \param buffer_alloc A pointer to the buffer
+ * \param in_buff Input (if == 1) or Output (if == 0) buffer
+ * \param nbytes Number of bytes of data
+ * \return returns arg: if address is aligned, buffer_alloc: if memory address is not aligned
+*/
+
+u32 *memory_alignment(const u8 *arg, u32 *buffer_alloc, int in_buff, int nbytes)
+{
+ if (ifx_danube_pre_1_4) {
+ /* for input buffer */
+ if(in_buff) {
+ if (((u32) arg) & 0xF) {
+ memcpy(buffer_alloc, arg, nbytes);
+ return (u32 *) buffer_alloc;
+ }
+ else
+ return (u32 *) arg;
+ }
+ else {
+ /* for output buffer */
+ if (((u32) arg) & 0x3)
+ return buffer_alloc;
+ else
+ return (u32 *) arg;
+ }
+ }
+
+ return (u32 *) arg;
+}
+
+/*! \fn void aes_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief copy the DMA data to the memory address space for AES. The swaping of the 4 bytes
+ * is done only for Danube version 1.3 (FIX). Otherwise, it is a direct memory copy
+ * to out_arg pointer
+ * \param outcopy Pointer to the address to store swapped copy
+ * \param out_dma A pointer to the memory address that stores the DMA data
+ * \param out_arg The pointer to the memory address that needs to be copied to
+ * \param nbytes Number of bytes of data
+*/
+
+void aes_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes)
+{
+ int i = 0;
+ int x = 0;
+
+ /* DANUBE PRE 1.4 SOFTWARE FIX */
+ if (ifx_danube_pre_1_4) {
+ for (i = 0; i < (nbytes / 4); i++) {
+ x = i ^ 0x3;
+ outcopy[i] = out_dma[x];
+
+ }
+ if (((u32) out_arg) & 0x3) {
+ memcpy((u8 *)out_arg, outcopy, nbytes);
+ }
+ }
+ else
+ memcpy (out_arg, out_dma, nbytes);
+}
+
+/*! \fn void des_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief copy the DMA data to the memory address space for DES. The swaping of the 4 bytes
+ * is done only for Danube version 1.3 (FIX). Otherwise, it is a direct memory copy
+ * to out_arg pointer
+ *
+ * \param outcopy Pointer to the address to store swapped copy
+ * \param out_dma A pointer to the memory address that stores the DMA data
+ * \param out_arg The pointer to the memory address that needs to be copied to
+ * \param nbytes Number of bytes of data
+*/
+
+void des_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes)
+{
+ int i = 0;
+ int x = 0;
+
+ /* DANUBE PRE 1.4 SOFTWARE FIX */
+ if (ifx_danube_pre_1_4) {
+ for (i = 0; i < (nbytes / 4); i++) {
+ x = i ^ 1;
+ outcopy[i] = out_dma[x];
+
+ }
+ if (((u32) out_arg) & 0x3) {
+ memcpy((u8 *)out_arg, outcopy, nbytes);
+ }
+ }
+ else
+ memcpy (out_arg, out_dma, nbytes);
+}
+
+/*! \fn int des_memory_allocate(int value)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief allocates memory to the necessary memory input/output buffer location, used during
+ * the DES algorithm DMA transfer (memory alignment issues)
+ * \param value value determinds whether the calling of the function is for a input buffer
+ * or for an output buffer memory allocation
+*/
+
+int des_memory_allocate(int value)
+{
+ if (ifx_danube_pre_1_4) {
+ if (value == BUFFER_IN) {
+ des_buff_in = kmalloc(DEU_MAX_PACKET_SIZE, GFP_ATOMIC);
+ if (!des_buff_in)
+ return -1;
+ else
+ return 0;
+ }
+ else {
+ des_buff_out = kmalloc(DEU_MAX_PACKET_SIZE, GFP_ATOMIC);
+ if (!des_buff_out)
+ return -1;
+ else
+ return 0;
+ }
+ }
+
+ else
+ return 0;
+}
+
+/*! \fn int aes_memory_allocate(int value)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief allocates memory to the necessary memory input/output buffer location, used during
+ * the AES algorithm DMA transfer (memory alignment issues)
+ * \param value value determinds whether the calling of the function is for a input buffer
+ * or for an output buffer memory allocation
+*/
+
+int aes_memory_allocate(int value)
+{
+ if (ifx_danube_pre_1_4) {
+ if (value == BUFFER_IN) {
+ aes_buff_in = kmalloc(DEU_MAX_PACKET_SIZE, GFP_ATOMIC);
+ if (!aes_buff_in)
+ return -1;
+ else
+ return 0;
+ }
+ else {
+ aes_buff_out = kmalloc(DEU_MAX_PACKET_SIZE, GFP_ATOMIC);
+ if (!aes_buff_out)
+ return -1;
+ else
+ return 0;
+ }
+ }
+
+ else
+ return 0;
+}
+
+/*! \fn void memory_release(u32 *addr)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief frees previously allocated memory
+ * \param addr memory address of the buffer that needs to be freed
+*/
+
+void memory_release(u32 *addr)
+{
+ if (addr)
+ kfree(addr);
+ return;
+}
+
+/*! \fn __exit ifxdeu_fini_dma(void)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief unregister dma devices after exit
+*/
+
+void __exit ifxdeu_fini_dma(void)
+{
+ if (g_dma_page_ptr)
+ free_page((u32) g_dma_page_ptr);
+ dma_device_release(ifx_deu[0].dma_device);
+ dma_device_unregister(ifx_deu[0].dma_device);
+
+}
+
+#endif /* CONFIG_CRYPTO_DEV_IFXMIPS_DMA */
+
+/*! \fn u32 endian_swap(u32 input)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief function is not used
+ * \param input Data input to be swapped
+ * \return input
+*/
+
+u32 endian_swap(u32 input)
+{
+ return input;
+}
+
+/*! \fn u32 input_swap(u32 input)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief Swap the input data if the current chip is Danube version
+ * 1.4 and do nothing to the data if the current chip is
+ * Danube version 1.3
+ * \param input data that needs to be swapped
+ * \return input or swapped input
+*/
+
+u32 input_swap(u32 input)
+{
+ if (!ifx_danube_pre_1_4) {
+ u8 *ptr = (u8 *)&input;
+ return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
+ }
+ else
+ return input;
+}
+
+
+
+/*! \fn void aes_chip_init (void)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief initialize AES hardware
+*/
+
+int aes_chip_init (void)
+{
+ volatile struct aes_t *aes = (struct aes_t *) AES_START;
+
+#ifndef CONFIG_CRYPTO_DEV_IFXMIPS_DMA
+ //start crypto engine with write to ILR
+ aes->controlr.SM = 1;
+ aes->controlr.ARS = 1;
+#else
+ aes->controlr.SM = 1;
+ aes->controlr.ARS = 1; // 0 for dma
+#endif
+ return 0;
+}
+
+/*! \fn void des_chip_init (void)
+ * \ingroup BOARD_SPECIFIC_FUNCTIONS
+ * \brief initialize DES hardware
+*/
+
+void des_chip_init (void)
+{
+ volatile struct des_t *des = (struct des_t *) DES_3DES_START;
+
+#ifndef CONFIG_CRYPTO_DEV_IFXMIPS_DMA
+ // start crypto engine with write to ILR
+ des->controlr.SM = 1;
+ des->controlr.ARS = 1;
+#else
+ des->controlr.SM = 1;
+ des->controlr.ARS = 1; // 0 for dma
+
+#endif
+}
+
+/*! \fn void chip_version (void)
+ * \ingroup IFX_DES_FUNCTIONS
+ * \brief To find the version of the chip by looking at the chip ID
+ * \param ifx_danube_pre_1_4 (sets to 1 if Chip is Danube less than v1.4)
+*/
+
+void chip_version(void)
+{
+ /* DANUBE PRE 1.4 SOFTWARE FIX */
+ int chip_id = 0;
+ chip_id = *IFX_MPS_CHIPID;
+ chip_id >>= 28;
+
+ if (chip_id >= 4) {
+ ifx_danube_pre_1_4 = 0;
+ printk("Danube Chip ver. 1.4 detected. \n");
+ }
+ else {
+ ifx_danube_pre_1_4 = 1;
+ printk("Danube Chip ver. 1.3 or below detected. \n");
+ }
+
+ return;
+}
+
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