/**
* AMCC SoC PPC4xx Crypto Driver
*
* Copyright (c) 2008 Applied Micro Circuits Corporation.
* All rights reserved. James Hsiao <jhsiao@amcc.com>
*
* 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.
*
* This file implements AMCC crypto offload Linux device driver for use with
* Linux CryptoAPI.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/spinlock_types.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/cacheflush.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
#include "crypto4xx_reg_def.h"
#include "crypto4xx_core.h"
#include "crypto4xx_sa.h"
#define PPC4XX_SEC_VERSION_STR "0.5"
/**
* PPC4xx Crypto Engine Initialization Routine
*/
static void crypto4xx_hw_init(struct crypto4xx_device *dev)
{
union ce_ring_size ring_size;
union ce_ring_contol ring_ctrl;
union ce_part_ring_size part_ring_size;
union ce_io_threshold io_threshold;
u32 rand_num;
union ce_pe_dma_cfg pe_dma_cfg;
u32 device_ctrl;
writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG);
/* setup pe dma, include reset sg, pdr and pe, then release reset */
pe_dma_cfg.w = 0;
pe_dma_cfg.bf.bo_sgpd_en = 1;
pe_dma_cfg.bf.bo_data_en = 0;
pe_dma_cfg.bf.bo_sa_en = 1;
pe_dma_cfg.bf.bo_pd_en = 1;
pe_dma_cfg.bf.dynamic_sa_en = 1;
pe_dma_cfg.bf.reset_sg = 1;
pe_dma_cfg.bf.reset_pdr = 1;
pe_dma_cfg.bf.reset_pe = 1;
writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
/* un reset pe,sg and pdr */
pe_dma_cfg.bf.pe_mode = 0;
pe_dma_cfg.bf.reset_sg = 0;
pe_dma_cfg.bf.reset_pdr = 0;
pe_dma_cfg.bf.reset_pe = 0;
pe_dma_cfg.bf.bo_td_en = 0;
writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_PDR_BASE);
writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_RDR_BASE);
writel(PPC4XX_PRNG_CTRL_AUTO_EN, dev->ce_base + CRYPTO4XX_PRNG_CTRL);
get_random_bytes(&rand_num, sizeof(rand_num));
writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_L);
get_random_bytes(&rand_num, sizeof(rand_num));
writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_H);
ring_size.w = 0;
ring_size.bf.ring_offset = PPC4XX_PD_SIZE;
ring_size.bf.ring_size = PPC4XX_NUM_PD;
writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE);
ring_ctrl.w = 0;
writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL);
device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
device_ctrl |= PPC4XX_DC_3DES_EN;
writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE);
writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE);
part_ring_size.w = 0;
part_ring_size.bf.sdr_size = PPC4XX_SDR_SIZE;
part_ring_size.bf.gdr_size = PPC4XX_GDR_SIZE;
writel(part_ring_size.w, dev->ce_base + CRYPTO4XX_PART_RING_SIZE);
writel(PPC4XX_SD_BUFFER_SIZE, dev->ce_base + CRYPTO4XX_PART_RING_CFG);
io_threshold.w = 0;
io_threshold.bf.output_threshold = PPC4XX_OUTPUT_THRESHOLD;
io_threshold.bf.input_threshold = PPC4XX_INPUT_THRESHOLD;
writel(io_threshold.w, dev->ce_base + CRYPTO4XX_IO_THRESHOLD);
writel(0, dev->ce_base + CRYPTO4XX_PDR_BASE_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_RDR_BASE_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_PKT_SRC_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_PKT_DEST_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_SA_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_GATH_RING_BASE_UADDR);
writel(0, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE_UADDR);
/* un reset pe,sg and pdr */
pe_dma_cfg.bf.pe_mode = 1;
pe_dma_cfg.bf.reset_sg = 0;
pe_dma_cfg.bf.reset_pdr = 0;
pe_dma_cfg.bf.reset_pe = 0;
pe_dma_cfg.bf.bo_td_en = 0;
writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
/*clear all pending interrupt*/
writel(PPC4XX_INTERRUPT_CLR, dev->ce_base + CRYPTO4XX_INT_CLR);
writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
writel(PPC4XX_INT_CFG, dev->ce_base + CRYPTO4XX_INT_CFG);
writel(PPC4XX_PD_DONE_INT, dev->ce_base + CRYPTO4XX_INT_EN);
}
int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size)
{
ctx->sa_in = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4,
&ctx->sa_in_dma_addr, GFP_ATOMIC);
if (ctx->sa_in == NULL)
return -ENOMEM;
ctx->sa_out = dma_alloc_coherent(ctx->dev->core_dev->device, size * 4,
&ctx->sa_out_dma_addr, GFP_ATOMIC);
if (ctx->sa_out == NULL) {
dma_free_coherent(ctx->dev->core_dev->device,
ctx->sa_len * 4,
ctx->sa_in, ctx->sa_in_dma_addr);
return -ENOMEM;
}
memset(ctx->sa_in, 0, size * 4);
memset(ctx->sa_out, 0, size * 4);
ctx->sa_len = size;
return 0;
}
void crypto4xx_free_sa(struct crypto4xx_ctx *ctx)
{
if (ctx->sa_in != NULL)
dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4,
ctx->sa_in, ctx->sa_in_dma_addr);
if (ctx->sa_out != NULL)
dma_free_coherent(ctx->dev->core_dev->device, ctx->sa_len * 4,
ctx->sa_out, ctx->sa_out_dma_addr);
ctx->sa_in_dma_addr = 0;
ctx->sa_out_dma_addr = 0;
ctx->sa_len = 0;
}
u32 crypto4xx_alloc_state_record(struct crypto4xx_ctx *ctx)
{
ctx->state_record = dma_alloc_coherent(ctx->dev->core_dev->device,
sizeof(struct sa_state_record),
&ctx->state_record_dma_addr, GFP_ATOMIC);
if (!ctx->state_record_dma_addr)
return -ENOMEM;
memset(ctx->state_record, 0, sizeof(struct sa_state_record));
return 0;
}
void crypto4xx_free_state_record(struct crypto4xx_ctx *ctx)
{
if (ctx->state_record != NULL)
dma_free_coherent(ctx->dev->core_dev->device,
sizeof(struct sa_state_record),
ctx->state_record,
ctx->state_record_dma_addr);
ctx->state_record_dma_addr = 0;
}
/**
* alloc memory for the gather ring
* no need to alloc buf for the ring
* gdr_tail, gdr_head and gdr_count are initialized by this function
*/
static u32 crypto4xx_build_pdr(struct crypto4xx_device *dev)
{
int i;
struct pd_uinfo *pd_uinfo;
dev->pdr = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct ce_pd) * PPC4XX_NUM_PD,
&dev->pdr_pa, GFP_ATOMIC);
if (!dev->pdr)
return -ENOMEM;
dev->pdr_uinfo = kzalloc(sizeof(struct pd_uinfo) * PPC4XX_NUM_PD,
GFP_KERNEL);
if (!dev->pdr_uinfo) {
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_pd) * PPC4XX_NUM_PD,
dev->pdr,
dev->pdr_pa);
return -ENOMEM;
}
memset(dev->pdr, 0, sizeof(struct ce_pd) * PPC4XX_NUM_PD);
dev->shadow_sa_pool = dma_alloc_coherent(dev->core_dev->device,
256 * PPC4XX_NUM_PD,
&dev->shadow_sa_pool_pa,
GFP_ATOMIC);
if (!dev->shadow_sa_pool)
return -ENOMEM;
dev->shadow_sr_pool = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
&dev->shadow_sr_pool_pa, GFP_ATOMIC);
if (!dev->shadow_sr_pool)
return -ENOMEM;
for (i = 0; i < PPC4XX_NUM_PD; i++) {
pd_uinfo = (struct pd_uinfo *) (dev->pdr_uinfo +
sizeof(struct pd_uinfo) * i);
/* alloc 256 bytes which is enough for any kind of dynamic sa */
pd_uinfo->sa_va = dev->shadow_sa_pool + 256 * i;
pd_uinfo->sa_pa = dev->shadow_sa_pool_pa + 256 * i;
/* alloc state record */
pd_uinfo->sr_va = dev->shadow_sr_pool +
sizeof(struct sa_state_record) * i;
pd_uinfo->sr_pa = dev->shadow_sr_pool_pa +
sizeof(struct sa_state_record) * i;
}
return 0;
}
static void crypto4xx_destroy_pdr(struct crypto4xx_device *dev)
{
if (dev->pdr != NULL)
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_pd) * PPC4XX_NUM_PD,
dev->pdr, dev->pdr_pa);
if (dev->shadow_sa_pool)
dma_free_coherent(dev->core_dev->device, 256 * PPC4XX_NUM_PD,
dev->shadow_sa_pool, dev->shadow_sa_pool_pa);
if (dev->shadow_sr_pool)
dma_free_coherent(dev->core_dev->device,
sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
dev->shadow_sr_pool, dev->shadow_sr_pool_pa);
kfree(dev->pdr_uinfo);
}
static u32 crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device *dev)
{
u32 retval;
u32 tmp;
retval = dev->pdr_head;
tmp = (dev->pdr_head + 1) % PPC4XX_NUM_PD;
if (tmp == dev->pdr_tail)
return ERING_WAS_FULL;
dev->pdr_head = tmp;
return retval;
}
static u32 crypto4xx_put_pd_to_pdr(struct crypto4xx_device *dev, u32 idx)
{
struct pd_uinfo *pd_uinfo;
unsigned long flags;
pd_uinfo = (struct pd_uinfo *)(dev->pdr_uinfo +
sizeof(struct pd_uinfo) * idx);
spin_lock_irqsave(&dev->core_dev->lock, flags);
if (dev->pdr_tail != PPC4XX_LAST_PD)
dev->pdr_tail++;
else
dev->pdr_tail = 0;
pd_uinfo->state = PD_ENTRY_FREE;
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return 0;
}
static struct ce_pd *crypto4xx_get_pdp(struct crypto4xx_device *dev,
dma_addr_t *pd_dma, u32 idx)
{
*pd_dma = dev->pdr_pa + sizeof(struct ce_pd) * idx;
return dev->pdr + sizeof(struct ce_pd) * idx;
}
/**
* alloc memory for the gather ring
* no need to alloc buf for the ring
* gdr_tail, gdr_head and gdr_count are initialized by this function
*/
static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev)
{
dev->gdr = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct ce_gd) * PPC4XX_NUM_GD,
&dev->gdr_pa, GFP_ATOMIC);
if (!dev->gdr)
return -ENOMEM;
memset(dev->gdr, 0, sizeof(struct ce_gd) * PPC4XX_NUM_GD);
return 0;
}
static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev)
{
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_gd) * PPC4XX_NUM_GD,
dev->gdr, dev->gdr_pa);
}
/*
* when this function is called.
* preemption or interrupt must be disabled
*/
u32 crypto4xx_get_n_gd(struct crypto4xx_device *dev, int n)
{
u32 retval;
u32 tmp;
if (n >= PPC4XX_NUM_GD)
return ERING_WAS_FULL;
retval = dev->gdr_head;
tmp = (dev->gdr_head + n) % PPC4XX_NUM_GD;
if (dev->gdr_head > dev->gdr_tail) {
if (tmp < dev->gdr_head && tmp >= dev->gdr_tail)
return ERING_WAS_FULL;
} else if (dev->gdr_head < dev->gdr_tail) {
if (tmp < dev->gdr_head || tmp >= dev->gdr_tail)
return ERING_WAS_FULL;
}
dev->gdr_head = tmp;
return retval;
}
static u32 crypto4xx_put_gd_to_gdr(struct crypto4xx_device *dev)
{
unsigned long flags;
spin_lock_irqsave(&dev->core_dev->lock, flags);
if (dev->gdr_tail == dev->gdr_head) {
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return 0;
}
if (dev->gdr_tail != PPC4XX_LAST_GD)
dev->gdr_tail++;
else
dev->gdr_tail = 0;
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return 0;
}
static inline struct ce_gd *crypto4xx_get_gdp(struct crypto4xx_device *dev,
dma_addr_t *gd_dma, u32 idx)
{
*gd_dma = dev->gdr_pa + sizeof(struct ce_gd) * idx;
return (struct ce_gd *) (dev->gdr + sizeof(struct ce_gd) * idx);
}
/**
* alloc memory for the scatter ring
* need to alloc buf for the ring
* sdr_tail, sdr_head and sdr_count are initialized by this function
*/
static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
{
int i;
struct ce_sd *sd_array;
/* alloc memory for scatter descriptor ring */
dev->sdr = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct ce_sd) * PPC4XX_NUM_SD,
&dev->sdr_pa, GFP_ATOMIC);
if (!dev->sdr)
return -ENOMEM;
dev->scatter_buffer_size = PPC4XX_SD_BUFFER_SIZE;
dev->scatter_buffer_va =
dma_alloc_coherent(dev->core_dev->device,
dev->scatter_buffer_size * PPC4XX_NUM_SD,
&dev->scatter_buffer_pa, GFP_ATOMIC);
if (!dev->scatter_buffer_va) {
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_sd) * PPC4XX_NUM_SD,
dev->sdr, dev->sdr_pa);
return -ENOMEM;
}
sd_array = dev->sdr;
for (i = 0; i < PPC4XX_NUM_SD; i++) {
sd_array[i].ptr = dev->scatter_buffer_pa +
dev->scatter_buffer_size * i;
}
return 0;
}
static void crypto4xx_destroy_sdr(struct crypto4xx_device *dev)
{
if (dev->sdr != NULL)
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_sd) * PPC4XX_NUM_SD,
dev->sdr, dev->sdr_pa);
if (dev->scatter_buffer_va != NULL)
dma_free_coherent(dev->core_dev->device,
dev->scatter_buffer_size * PPC4XX_NUM_SD,
dev->scatter_buffer_va,
dev->scatter_buffer_pa);
}
/*
* when this function is called.
* preemption or interrupt must be disabled
*/
static u32 crypto4xx_get_n_sd(struct crypto4xx_device *dev, int n)
{
u32 retval;
u32 tmp;
if (n >= PPC4XX_NUM_SD)
return ERING_WAS_FULL;
retval = dev->sdr_head;
tmp = (dev->sdr_head + n) % PPC4XX_NUM_SD;
if (dev->sdr_head > dev->gdr_tail) {
if (tmp < dev->sdr_head && tmp >= dev->sdr_tail)
return ERING_WAS_FULL;
} else if (dev->sdr_head < dev->sdr_tail) {
if (tmp < dev->sdr_head || tmp >= dev->sdr_tail)
return ERING_WAS_FULL;
} /* the head = tail, or empty case is already take cared */
dev->sdr_head = tmp;
return retval;
}
static u32 crypto4xx_put_sd_to_sdr(struct crypto4xx_device *dev)
{
unsigned long flags;
spin_lock_irqsave(&dev->core_dev->lock, flags);
if (dev->sdr_tail == dev->sdr_head) {
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return 0;
}
if (dev->sdr_tail != PPC4XX_LAST_SD)
dev->sdr_tail++;
else
dev->sdr_tail = 0;
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return 0;
}
static inline struct ce_sd *crypto4xx_get_sdp(struct crypto4xx_device *dev,
dma_addr_t *sd_dma, u32 idx)
{
*sd_dma = dev->sdr_pa + sizeof(struct ce_sd) * idx;
return (struct ce_sd *)(dev->sdr + sizeof(struct ce_sd) * idx);
}
static u32 crypto4xx_fill_one_page(struct crypto4xx_device *dev,
dma_addr_t *addr, u32 *length,
u32 *idx, u32 *offset, u32 *nbytes)
{
u32 len;
if (*length > dev->scatter_buffer_size) {
memcpy(phys_to_virt(*addr),
dev->scatter_buffer_va +
*idx * dev->scatter_buffer_size + *offset,
dev->scatter_buffer_size);
*offset = 0;
*length -= dev->scatter_buffer_size;
*nbytes -= dev->scatter_buffer_size;
if (*idx == PPC4XX_LAST_SD)
*idx = 0;
else
(*idx)++;
*addr = *addr + dev->scatter_buffer_size;
return 1;
} else if (*length < dev->scatter_buffer_size) {
memcpy(phys_to_virt(*addr),
dev->scatter_buffer_va +
*idx * dev->scatter_buffer_size + *offset, *length);
if ((*offset + *length) == dev->scatter_buffer_size) {
if (*idx == PPC4XX_LAST_SD)
*idx = 0;
else
(*idx)++;
*nbytes -= *length;
*offset = 0;
} else {
*nbytes -= *length;
*offset += *length;
}
return 0;
} else {
len = (*nbytes <= dev->scatter_buffer_size) ?
(*nbytes) : dev->scatter_buffer_size;
memcpy(phys_to_virt(*addr),
dev->scatter_buffer_va +
*idx * dev->scatter_buffer_size + *offset,
len);
*offset = 0;
*nbytes -= len;
if (*idx == PPC4XX_LAST_SD)
*idx = 0;
else
(*idx)++;
return 0;
}
}
static void crypto4xx_copy_pkt_to_dst(struct crypto4xx_device *dev,
struct ce_pd *pd,
struct pd_uinfo *pd_uinfo,
u32 nbytes,
struct scatterlist *dst)
{
dma_addr_t addr;
u32 this_sd;
u32 offset;
u32 len;
u32 i;
u32 sg_len;
struct scatterlist *sg;
this_sd = pd_uinfo->first_sd;
offset = 0;
i = 0;
while (nbytes) {
sg = &dst[i];
sg_len = sg->length;
addr = dma_map_page(dev->core_dev->device, sg_page(sg),
sg->offset, sg->length, DMA_TO_DEVICE);
if (offset == 0) {
len = (nbytes <= sg->length) ? nbytes : sg->length;
while (crypto4xx_fill_one_page(dev, &addr, &len,
&this_sd, &offset, &nbytes))
;
if (!nbytes)
return;
i++;
} else {
len = (nbytes <= (dev->scatter_buffer_size - offset)) ?
nbytes : (dev->scatter_buffer_size - offset);
len = (sg->length < len) ? sg->length : len;
while (crypto4xx_fill_one_page(dev, &addr, &len,
&this_sd, &offset, &nbytes))
;
if (!nbytes)
return;
sg_len -= len;
if (sg_len) {
addr += len;
while (crypto4xx_fill_one_page(dev, &addr,
&sg_len, &this_sd, &offset, &nbytes))
;
}
i++;
}
}
}
static u32 crypto4xx_copy_digest_to_dst(struct pd_uinfo *pd_uinfo,
struct crypto4xx_ctx *ctx)
{
struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *) ctx->sa_in;
struct sa_state_record *state_record =
(struct sa_state_record *) pd_uinfo->sr_va;
if (sa->sa_command_0.bf.hash_alg == SA_HASH_ALG_SHA1) {
memcpy((void *) pd_uinfo->dest_va, state_record->save_digest,
SA_HASH_ALG_SHA1_DIGEST_SIZE);
}
return 0;
}
static void crypto4xx_ret_sg_desc(struct crypto4xx_device *dev,
struct pd_uinfo *pd_uinfo)
{
int i;
if (pd_uinfo->num_gd) {
for (i = 0; i < pd_uinfo->num_gd; i++)
crypto4xx_put_gd_to_gdr(dev);
pd_uinfo->first_gd = 0xffffffff;
pd_uinfo->num_gd = 0;
}
if (pd_uinfo->num_sd) {
for (i = 0; i < pd_uinfo->num_sd; i++)
crypto4xx_put_sd_to_sdr(dev);
pd_uinfo->first_sd = 0xffffffff;
pd_uinfo->num_sd = 0;
}
}
static u32 crypto4xx_ablkcipher_done(struct crypto4xx_device *dev,
struct pd_uinfo *pd_uinfo,
struct ce_pd *pd)
{
struct crypto4xx_ctx *ctx;
struct ablkcipher_request *ablk_req;
struct scatterlist *dst;
dma_addr_t addr;
ablk_req = ablkcipher_request_cast(pd_uinfo->async_req);
ctx = crypto_tfm_ctx(ablk_req->base.tfm);
if (pd_uinfo->using_sd) {
crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo, ablk_req->nbytes,
ablk_req->dst);
} else {
dst = pd_uinfo->dest_va;
addr = dma_map_page(dev->core_dev->device, sg_page(dst),
dst->offset, dst->length, DMA_FROM_DEVICE);
}
crypto4xx_ret_sg_desc(dev, pd_uinfo);
if (ablk_req->base.complete != NULL)
ablk_req->base.complete(&ablk_req->base, 0);
return 0;
}
static u32 crypto4xx_ahash_done(struct crypto4xx_device *dev,
struct pd_uinfo *pd_uinfo)
{
struct crypto4xx_ctx *ctx;
struct ahash_request *ahash_req;
ahash_req = ahash_request_cast(pd_uinfo->async_req);
ctx = crypto_tfm_ctx(ahash_req->base.tfm);
crypto4xx_copy_digest_to_dst(pd_uinfo,
crypto_tfm_ctx(ahash_req->base.tfm));
crypto4xx_ret_sg_desc(dev, pd_uinfo);
/* call user provided callback function x */
if (ahash_req->base.complete != NULL)
ahash_req->base.complete(&ahash_req->base, 0);
return 0;
}
static u32 crypto4xx_pd_done(struct crypto4xx_device *dev, u32 idx)
{
struct ce_pd *pd;
struct pd_uinfo *pd_uinfo;
pd = dev->pdr + sizeof(struct ce_pd)*idx;
pd_uinfo = dev->pdr_uinfo + sizeof(struct pd_uinfo)*idx;
if (crypto_tfm_alg_type(pd_uinfo->async_req->tfm) ==
CRYPTO_ALG_TYPE_ABLKCIPHER)
return crypto4xx_ablkcipher_done(dev, pd_uinfo, pd);
else
return crypto4xx_ahash_done(dev, pd_uinfo);
}
/**
* Note: Only use this function to copy items that is word aligned.
*/
void crypto4xx_memcpy_le(unsigned int *dst,
const unsigned char *buf,
int len)
{
u8 *tmp;
for (; len >= 4; buf += 4, len -= 4)
*dst++ = cpu_to_le32(*(unsigned int *) buf);
tmp = (u8 *)dst;
switch (len) {
case 3:
*tmp++ = 0;
*tmp++ = *(buf+2);
*tmp++ = *(buf+1);
*tmp++ = *buf;
break;
case 2:
*tmp++ = 0;
*tmp++ = 0;
*tmp++ = *(buf+1);
*tmp++ = *buf;
break;
case 1:
*tmp++ = 0;
*tmp++ = 0;
*tmp++ = 0;
*tmp++ = *buf;
break;
default:
break;
}
}
static void crypto4xx_stop_all(struct crypto4xx_core_device *core_dev)
{
crypto4xx_destroy_pdr(core_dev->dev);
crypto4xx_destroy_gdr(core_dev->dev);
crypto4xx_destroy_sdr(core_dev->dev);
iounmap(core_dev->dev->ce_base);
kfree(core_dev->dev);
kfree(core_dev);
}
void crypto4xx_return_pd(struct crypto4xx_device *dev,
u32 pd_entry, struct ce_pd *pd,
struct pd_uinfo *pd_uinfo)
{
/* irq should be already disabled */
dev->pdr_head = pd_entry;
pd->pd_ctl.w = 0;
pd->pd_ctl_len.w = 0;
pd_uinfo->state = PD_ENTRY_FREE;
}
/*
* derive number of elements in scatterlist
* Shamlessly copy from talitos.c
*/
static int get_sg_count(struct scatterlist *sg_list, int nbytes)
{
struct scatterlist *sg = sg_list;
int sg_nents = 0;
while (nbytes) {
sg_nents++;
if (sg->length > nbytes)
break;
nbytes -= sg->length;
sg = sg_next(sg);
}
return sg_nents;
}
static u32 get_next_gd(u32 current)
{
if (current != PPC4XX_LAST_GD)
return current + 1;
else
return 0;
}
static u32 get_next_sd(u32 current)
{
if (current != PPC4XX_LAST_SD)
return current + 1;
else
return 0;
}
u32 crypto4xx_build_pd(struct crypto_async_request *req,
struct crypto4xx_ctx *ctx,
struct scatterlist *src,
struct scatterlist *dst,
unsigned int datalen,
void *iv, u32 iv_len)
{
struct crypto4xx_device *dev = ctx->dev;
dma_addr_t addr, pd_dma, sd_dma, gd_dma;
struct dynamic_sa_ctl *sa;
struct scatterlist *sg;
struct ce_gd *gd;
struct ce_pd *pd;
u32 num_gd, num_sd;
u32 fst_gd = 0xffffffff;
u32 fst_sd = 0xffffffff;
u32 pd_entry;
unsigned long flags;
struct pd_uinfo *pd_uinfo = NULL;
unsigned int nbytes = datalen, idx;
unsigned int ivlen = 0;
u32 gd_idx = 0;
/* figure how many gd is needed */
num_gd = get_sg_count(src, datalen);
if (num_gd == 1)
num_gd = 0;
/* figure how many sd is needed */
if (sg_is_last(dst) || ctx->is_hash) {
num_sd = 0;
} else {
if (datalen > PPC4XX_SD_BUFFER_SIZE) {
num_sd = datalen / PPC4XX_SD_BUFFER_SIZE;
if (datalen % PPC4XX_SD_BUFFER_SIZE)
num_sd++;
} else {
num_sd = 1;
}
}
/*
* The follow section of code needs to be protected
* The gather ring and scatter ring needs to be consecutive
* In case of run out of any kind of descriptor, the descriptor
* already got must be return the original place.
*/
spin_lock_irqsave(&dev->core_dev->lock, flags);
if (num_gd) {
fst_gd = crypto4xx_get_n_gd(dev, num_gd);
if (fst_gd == ERING_WAS_FULL) {
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return -EAGAIN;
}
}
if (num_sd) {
fst_sd = crypto4xx_get_n_sd(dev, num_sd);
if (fst_sd == ERING_WAS_FULL) {
if (num_gd)
dev->gdr_head = fst_gd;
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return -EAGAIN;
}
}
pd_entry = crypto4xx_get_pd_from_pdr_nolock(dev);
if (pd_entry == ERING_WAS_FULL) {
if (num_gd)
dev->gdr_head = fst_gd;
if (num_sd)
dev->sdr_head = fst_sd;
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
return -EAGAIN;
}
spin_unlock_irqrestore(&dev->core_dev->lock, flags);
pd_uinfo = (struct pd_uinfo *)(dev->pdr_uinfo +
sizeof(struct pd_uinfo) * pd_entry);
pd = crypto4xx_get_pdp(dev, &pd_dma, pd_entry);
pd_uinfo->async_req = req;
pd_uinfo->num_gd = num_gd;
pd_uinfo->num_sd = num_sd;
if (iv_len || ctx->is_hash) {
ivlen = iv_len;
pd->sa = pd_uinfo->sa_pa;
sa = (struct dynamic_sa_ctl *) pd_uinfo->sa_va;
if (ctx->direction == DIR_INBOUND)
memcpy(sa, ctx->sa_in, ctx->sa_len * 4);
else
memcpy(sa, ctx->sa_out, ctx->sa_len * 4);
memcpy((void *) sa + ctx->offset_to_sr_ptr,
&pd_uinfo->sr_pa, 4);
if (iv_len)
crypto4xx_memcpy_le(pd_uinfo->sr_va, iv, iv_len);
} else {
if (ctx->direction == DIR_INBOUND) {
pd->sa = ctx->sa_in_dma_addr;
sa = (struct dynamic_sa_ctl *) ctx->sa_in;
} else {
pd->sa = ctx->sa_out_dma_addr;
sa = (struct dynamic_sa_ctl *) ctx->sa_out;
}
}
pd->sa_len = ctx->sa_len;
if (num_gd) {
/* get first gd we are going to use */
gd_idx = fst_gd;
pd_uinfo->first_gd = fst_gd;
pd_uinfo->num_gd = num_gd;
gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
pd->src = gd_dma;
/* enable gather */
sa->sa_command_0.bf.gather = 1;
idx = 0;
src = &src[0];
/* walk the sg, and setup gather array */
while (nbytes) {
sg = &src[idx];
addr = dma_map_page(dev->core_dev->device, sg_page(sg),
sg->offset, sg->length, DMA_TO_DEVICE);
gd->ptr = addr;
gd->ctl_len.len = sg->length;
gd->ctl_len.done = 0;
gd->ctl_len.ready = 1;
if (sg->length >= nbytes)
break;
nbytes -= sg->length;
gd_idx = get_next_gd(gd_idx);
gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
idx++;
}
} else {
pd->src = (u32)dma_map_page(dev->core_dev->device, sg_page(src),
src->offset, src->length, DMA_TO_DEVICE);
/*
* Disable gather in sa command
*/
sa->sa_command_0.bf.gather = 0;
/*
* Indicate gather array is not used
*/
pd_uinfo->first_gd = 0xffffffff;
pd_uinfo->num_gd = 0;
}
if (ctx->is_hash || sg_is_last(dst)) {
/*
* we know application give us dst a whole piece of memory
* no need to use scatter ring.
* In case of is_hash, the icv is always at end of src data.
*/
pd_uinfo->using_sd = 0;
pd_uinfo->first_sd = 0xffffffff;
pd_uinfo->num_sd = 0;
pd_uinfo->dest_va = dst;
sa->sa_command_0.bf.scatter = 0;
if (ctx->is_hash)
pd->dest = virt_to_phys((void *)dst);
else
pd->dest = (u32)dma_map_page(dev->core_dev->device,
sg_page(dst), dst->offset,
dst->length, DMA_TO_DEVICE);
} else {
struct ce_sd *sd = NULL;
u32 sd_idx = fst_sd;
nbytes = datalen;
sa->sa_command_0.bf.scatter = 1;
pd_uinfo->using_sd = 1;
pd_uinfo->dest_va = dst;
pd_uinfo->first_sd = fst_sd;
pd_uinfo->num_sd = num_sd;
sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
pd->dest = sd_dma;
/* setup scatter descriptor */
sd->ctl.done = 0;
sd->ctl.rdy = 1;
/* sd->ptr should be setup by sd_init routine*/
idx = 0;
if (nbytes >= PPC4XX_SD_BUFFER_SIZE)
nbytes -= PPC4XX_SD_BUFFER_SIZE;
else
nbytes = 0;
while (nbytes) {
sd_idx = get_next_sd(sd_idx);
sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
/* setup scatter descriptor */
sd->ctl.done = 0;
sd->ctl.rdy = 1;
if (nbytes >= PPC4XX_SD_BUFFER_SIZE)
nbytes -= PPC4XX_SD_BUFFER_SIZE;
else
/*
* SD entry can hold PPC4XX_SD_BUFFER_SIZE,
* which is more than nbytes, so done.
*/
nbytes = 0;
}
}
sa->sa_command_1.bf.hash_crypto_offset = 0;
pd->pd_ctl.w = ctx->pd_ctl;
pd->pd_ctl_len.w = 0x00400000 | (ctx->bypass << 24) | datalen;
pd_uinfo->state = PD_ENTRY_INUSE;
wmb();
/* write any value to push engine to read a pd */
writel(1, dev->ce_base + CRYPTO4XX_INT_DESCR_RD);
return -EINPROGRESS;
}
/**
* Algorithm Registration Functions
*/
static int crypto4xx_alg_init(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
struct crypto4xx_alg *amcc_alg = crypto_alg_to_crypto4xx_alg(alg);
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->dev = amcc_alg->dev;
ctx->sa_in = NULL;
ctx->sa_out = NULL;
ctx->sa_in_dma_addr = 0;
ctx->sa_out_dma_addr = 0;
ctx->sa_len = 0;
switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
default:
tfm->crt_ablkcipher.reqsize = sizeof(struct crypto4xx_ctx);
break;
case CRYPTO_ALG_TYPE_AHASH:
crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
sizeof(struct crypto4xx_ctx));
break;
}
return 0;
}
static void crypto4xx_alg_exit(struct crypto_tfm *tfm)
{
struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
crypto4xx_free_sa(ctx);
crypto4xx_free_state_record(ctx);
}
int crypto4xx_register_alg(struct crypto4xx_device *sec_dev,
struct crypto4xx_alg_common *crypto_alg,
int array_size)
{
struct crypto4xx_alg *alg;
int i;
int rc = 0;
for (i = 0; i < array_size; i++) {
alg = kzalloc(sizeof(struct crypto4xx_alg), GFP_KERNEL);
if (!alg)
return -ENOMEM;
alg->alg = crypto_alg[i];
alg->dev = sec_dev;
switch (alg->alg.type) {
case CRYPTO_ALG_TYPE_AHASH:
rc = crypto_register_ahash(&alg->alg.u.hash);
break;
default:
rc = crypto_register_alg(&alg->alg.u.cipher);
break;
}
if (rc) {
list_del(&alg->entry);
kfree(alg);
} else {
list_add_tail(&alg->entry, &sec_dev->alg_list);
}
}
return 0;
}
static void crypto4xx_unregister_alg(struct crypto4xx_device *sec_dev)
{
struct crypto4xx_alg *alg, *tmp;
list_for_each_entry_safe(alg, tmp, &sec_dev->alg_list, entry) {
list_del(&alg->entry);
switch (alg->alg.type) {
case CRYPTO_ALG_TYPE_AHASH:
crypto_unregister_ahash(&alg->alg.u.hash);
break;
default:
crypto_unregister_alg(&alg->alg.u.cipher);
}
kfree(alg);
}
}
static void crypto4xx_bh_tasklet_cb(unsigned long data)
{
struct device *dev = (struct device *)data;
struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
struct pd_uinfo *pd_uinfo;
struct ce_pd *pd;
u32 tail;
while (core_dev->dev->pdr_head != core_dev->dev->pdr_tail) {
tail = core_dev->dev->pdr_tail;
pd_uinfo = core_dev->dev->pdr_uinfo +
sizeof(struct pd_uinfo)*tail;
pd = core_dev->dev->pdr + sizeof(struct ce_pd) * tail;
if ((pd_uinfo->state == PD_ENTRY_INUSE) &&
pd->pd_ctl.bf.pe_done &&
!pd->pd_ctl.bf.host_ready) {
pd->pd_ctl.bf.pe_done = 0;
crypto4xx_pd_done(core_dev->dev, tail);
crypto4xx_put_pd_to_pdr(core_dev->dev, tail);
pd_uinfo->state = PD_ENTRY_FREE;
} else {
/* if tail not done, break */
break;
}
}
}
/**
* Top Half of isr.
*/
static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data)
{
struct device *dev = (struct device *)data;
struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
if (core_dev->dev->ce_base == 0)
return 0;
writel(PPC4XX_INTERRUPT_CLR,
core_dev->dev->ce_base + CRYPTO4XX_INT_CLR);
tasklet_schedule(&core_dev->tasklet);
return IRQ_HANDLED;
}
/**
* Supported Crypto Algorithms
*/
struct crypto4xx_alg_common crypto4xx_alg[] = {
/* Crypto AES modes */
{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER, .u.cipher = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-ppc4xx",
.cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto4xx_ctx),
.cra_type = &crypto_ablkcipher_type,
.cra_init = crypto4xx_alg_init,
.cra_exit = crypto4xx_alg_exit,
.cra_module = THIS_MODULE,
.cra_u = {
.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_IV_SIZE,
.setkey = crypto4xx_setkey_aes_cbc,
.encrypt = crypto4xx_encrypt,
.decrypt = crypto4xx_decrypt,
}
}
}},
};
/**
* Module Initialization Routine
*/
static int __init crypto4xx_probe(struct platform_device *ofdev)
{
int rc;
struct resource res;
struct device *dev = &ofdev->dev;
struct crypto4xx_core_device *core_dev;
rc = of_address_to_resource(ofdev->dev.of_node, 0, &res);
if (rc)
return -ENODEV;
if (of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-crypto")) {
mtdcri(SDR0, PPC460EX_SDR0_SRST,
mfdcri(SDR0, PPC460EX_SDR0_SRST) | PPC460EX_CE_RESET);
mtdcri(SDR0, PPC460EX_SDR0_SRST,
mfdcri(SDR0, PPC460EX_SDR0_SRST) & ~PPC460EX_CE_RESET);
} else if (of_find_compatible_node(NULL, NULL,
"amcc,ppc405ex-crypto")) {
mtdcri(SDR0, PPC405EX_SDR0_SRST,
mfdcri(SDR0, PPC405EX_SDR0_SRST) | PPC405EX_CE_RESET);
mtdcri(SDR0, PPC405EX_SDR0_SRST,
mfdcri(SDR0, PPC405EX_SDR0_SRST) & ~PPC405EX_CE_RESET);
} else if (of_find_compatible_node(NULL, NULL,
"amcc,ppc460sx-crypto")) {
mtdcri(SDR0, PPC460SX_SDR0_SRST,
mfdcri(SDR0, PPC460SX_SDR0_SRST) | PPC460SX_CE_RESET);
mtdcri(SDR0, PPC460SX_SDR0_SRST,
mfdcri(SDR0, PPC460SX_SDR0_SRST) & ~PPC460SX_CE_RESET);
} else {
printk(KERN_ERR "Crypto Function Not supported!\n");
return -EINVAL;
}
core_dev = kzalloc(sizeof(struct crypto4xx_core_device), GFP_KERNEL);
if (!core_dev)
return -ENOMEM;
dev_set_drvdata(dev, core_dev);
core_dev->ofdev = ofdev;
core_dev->dev = kzalloc(sizeof(struct crypto4xx_device), GFP_KERNEL);
if (!core_dev->dev)
goto err_alloc_dev;
core_dev->dev->core_dev = core_dev;
core_dev->device = dev;
spin_lock_init(&core_dev->lock);
INIT_LIST_HEAD(&core_dev->dev->alg_list);
rc = crypto4xx_build_pdr(core_dev->dev);
if (rc)
goto err_build_pdr;
rc = crypto4xx_build_gdr(core_dev->dev);
if (rc)
goto err_build_gdr;
rc = crypto4xx_build_sdr(core_dev->dev);
if (rc)
goto err_build_sdr;
/* Init tasklet for bottom half processing */
tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb,
(unsigned long) dev);
/* Register for Crypto isr, Crypto Engine IRQ */
core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0,
core_dev->dev->name, dev);
if (rc)
goto err_request_irq;
core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0);
if (!core_dev->dev->ce_base) {
dev_err(dev, "failed to of_iomap\n");
rc = -ENOMEM;
goto err_iomap;
}
/* need to setup pdr, rdr, gdr and sdr before this */
crypto4xx_hw_init(core_dev->dev);
/* Register security algorithms with Linux CryptoAPI */
rc = crypto4xx_register_alg(core_dev->dev, crypto4xx_alg,
ARRAY_SIZE(crypto4xx_alg));
if (rc)
goto err_start_dev;
return 0;
err_start_dev:
iounmap(core_dev->dev->ce_base);
err_iomap:
free_irq(core_dev->irq, dev);
err_request_irq:
irq_dispose_mapping(core_dev->irq);
tasklet_kill(&core_dev->tasklet);
crypto4xx_destroy_sdr(core_dev->dev);
err_build_sdr:
crypto4xx_destroy_gdr(core_dev->dev);
err_build_gdr:
crypto4xx_destroy_pdr(core_dev->dev);
err_build_pdr:
kfree(core_dev->dev);
err_alloc_dev:
kfree(core_dev);
return rc;
}
static int __exit crypto4xx_remove(struct platform_device *ofdev)
{
struct device *dev = &ofdev->dev;
struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
free_irq(core_dev->irq, dev);
irq_dispose_mapping(core_dev->irq);
tasklet_kill(&core_dev->tasklet);
/* Un-register with Linux CryptoAPI */
crypto4xx_unregister_alg(core_dev->dev);
/* Free all allocated memory */
crypto4xx_stop_all(core_dev);
return 0;
}
static const struct of_device_id crypto4xx_match[] = {
{ .compatible = "amcc,ppc4xx-crypto",},
{ },
};
static struct platform_driver crypto4xx_driver = {
.driver = {
.name = "crypto4xx",
.owner = THIS_MODULE,
.of_match_table = crypto4xx_match,
},
.probe = crypto4xx_probe,
.remove = crypto4xx_remove,
};
module_platform_driver(crypto4xx_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Hsiao <jhsiao@amcc.com>");
MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator");