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talitos.c
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talitos.c
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/*
* talitos - Freescale Integrated Security Engine (SEC) device driver
*
* Copyright (c) 2008-2011 Freescale Semiconductor, Inc.
*
* Scatterlist Crypto API glue code copied from files with the following:
* Copyright (c) 2006-2007 Herbert Xu <herbert@gondor.apana.org.au>
*
* Crypto algorithm registration code copied from hifn driver:
* 2007+ Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
* All rights reserved.
*
* 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
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/crypto.h>
#include <linux/hw_random.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/sha.h>
#include <crypto/md5.h>
#include <crypto/internal/aead.h>
#include <crypto/authenc.h>
#include <crypto/skcipher.h>
#include <crypto/hash.h>
#include <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include "talitos.h"
static void to_talitos_ptr(struct talitos_ptr *ptr, dma_addr_t dma_addr,
unsigned int len, bool is_sec1)
{
ptr->ptr = cpu_to_be32(lower_32_bits(dma_addr));
if (is_sec1) {
ptr->len1 = cpu_to_be16(len);
} else {
ptr->len = cpu_to_be16(len);
ptr->eptr = upper_32_bits(dma_addr);
}
}
static void copy_talitos_ptr(struct talitos_ptr *dst_ptr,
struct talitos_ptr *src_ptr, bool is_sec1)
{
dst_ptr->ptr = src_ptr->ptr;
if (is_sec1) {
dst_ptr->len1 = src_ptr->len1;
} else {
dst_ptr->len = src_ptr->len;
dst_ptr->eptr = src_ptr->eptr;
}
}
static unsigned short from_talitos_ptr_len(struct talitos_ptr *ptr,
bool is_sec1)
{
if (is_sec1)
return be16_to_cpu(ptr->len1);
else
return be16_to_cpu(ptr->len);
}
static void to_talitos_ptr_ext_set(struct talitos_ptr *ptr, u8 val,
bool is_sec1)
{
if (!is_sec1)
ptr->j_extent = val;
}
static void to_talitos_ptr_ext_or(struct talitos_ptr *ptr, u8 val, bool is_sec1)
{
if (!is_sec1)
ptr->j_extent |= val;
}
/*
* map virtual single (contiguous) pointer to h/w descriptor pointer
*/
static void map_single_talitos_ptr(struct device *dev,
struct talitos_ptr *ptr,
unsigned int len, void *data,
enum dma_data_direction dir)
{
dma_addr_t dma_addr = dma_map_single(dev, data, len, dir);
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
to_talitos_ptr(ptr, dma_addr, len, is_sec1);
}
/*
* unmap bus single (contiguous) h/w descriptor pointer
*/
static void unmap_single_talitos_ptr(struct device *dev,
struct talitos_ptr *ptr,
enum dma_data_direction dir)
{
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
dma_unmap_single(dev, be32_to_cpu(ptr->ptr),
from_talitos_ptr_len(ptr, is_sec1), dir);
}
static int reset_channel(struct device *dev, int ch)
{
struct talitos_private *priv = dev_get_drvdata(dev);
unsigned int timeout = TALITOS_TIMEOUT;
bool is_sec1 = has_ftr_sec1(priv);
if (is_sec1) {
setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO,
TALITOS1_CCCR_LO_RESET);
while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR_LO) &
TALITOS1_CCCR_LO_RESET) && --timeout)
cpu_relax();
} else {
setbits32(priv->chan[ch].reg + TALITOS_CCCR,
TALITOS2_CCCR_RESET);
while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR) &
TALITOS2_CCCR_RESET) && --timeout)
cpu_relax();
}
if (timeout == 0) {
dev_err(dev, "failed to reset channel %d\n", ch);
return -EIO;
}
/* set 36-bit addressing, done writeback enable and done IRQ enable */
setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO, TALITOS_CCCR_LO_EAE |
TALITOS_CCCR_LO_CDWE | TALITOS_CCCR_LO_CDIE);
/* enable chaining descriptors */
if (is_sec1)
setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO,
TALITOS_CCCR_LO_NE);
/* and ICCR writeback, if available */
if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO,
TALITOS_CCCR_LO_IWSE);
return 0;
}
static int reset_device(struct device *dev)
{
struct talitos_private *priv = dev_get_drvdata(dev);
unsigned int timeout = TALITOS_TIMEOUT;
bool is_sec1 = has_ftr_sec1(priv);
u32 mcr = is_sec1 ? TALITOS1_MCR_SWR : TALITOS2_MCR_SWR;
setbits32(priv->reg + TALITOS_MCR, mcr);
while ((in_be32(priv->reg + TALITOS_MCR) & mcr)
&& --timeout)
cpu_relax();
if (priv->irq[1]) {
mcr = TALITOS_MCR_RCA1 | TALITOS_MCR_RCA3;
setbits32(priv->reg + TALITOS_MCR, mcr);
}
if (timeout == 0) {
dev_err(dev, "failed to reset device\n");
return -EIO;
}
return 0;
}
/*
* Reset and initialize the device
*/
static int init_device(struct device *dev)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int ch, err;
bool is_sec1 = has_ftr_sec1(priv);
/*
* Master reset
* errata documentation: warning: certain SEC interrupts
* are not fully cleared by writing the MCR:SWR bit,
* set bit twice to completely reset
*/
err = reset_device(dev);
if (err)
return err;
err = reset_device(dev);
if (err)
return err;
/* reset channels */
for (ch = 0; ch < priv->num_channels; ch++) {
err = reset_channel(dev, ch);
if (err)
return err;
}
/* enable channel done and error interrupts */
if (is_sec1) {
clrbits32(priv->reg + TALITOS_IMR, TALITOS1_IMR_INIT);
clrbits32(priv->reg + TALITOS_IMR_LO, TALITOS1_IMR_LO_INIT);
/* disable parity error check in DEU (erroneous? test vect.) */
setbits32(priv->reg_deu + TALITOS_EUICR, TALITOS1_DEUICR_KPE);
} else {
setbits32(priv->reg + TALITOS_IMR, TALITOS2_IMR_INIT);
setbits32(priv->reg + TALITOS_IMR_LO, TALITOS2_IMR_LO_INIT);
}
/* disable integrity check error interrupts (use writeback instead) */
if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
setbits32(priv->reg_mdeu + TALITOS_EUICR_LO,
TALITOS_MDEUICR_LO_ICE);
return 0;
}
/**
* talitos_submit - submits a descriptor to the device for processing
* @dev: the SEC device to be used
* @ch: the SEC device channel to be used
* @desc: the descriptor to be processed by the device
* @callback: whom to call when processing is complete
* @context: a handle for use by caller (optional)
*
* desc must contain valid dma-mapped (bus physical) address pointers.
* callback must check err and feedback in descriptor header
* for device processing status.
*/
int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
void (*callback)(struct device *dev,
struct talitos_desc *desc,
void *context, int error),
void *context)
{
struct talitos_private *priv = dev_get_drvdata(dev);
struct talitos_request *request;
unsigned long flags;
int head;
bool is_sec1 = has_ftr_sec1(priv);
spin_lock_irqsave(&priv->chan[ch].head_lock, flags);
if (!atomic_inc_not_zero(&priv->chan[ch].submit_count)) {
/* h/w fifo is full */
spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);
return -EAGAIN;
}
head = priv->chan[ch].head;
request = &priv->chan[ch].fifo[head];
/* map descriptor and save caller data */
if (is_sec1) {
desc->hdr1 = desc->hdr;
request->dma_desc = dma_map_single(dev, &desc->hdr1,
TALITOS_DESC_SIZE,
DMA_BIDIRECTIONAL);
} else {
request->dma_desc = dma_map_single(dev, desc,
TALITOS_DESC_SIZE,
DMA_BIDIRECTIONAL);
}
request->callback = callback;
request->context = context;
/* increment fifo head */
priv->chan[ch].head = (priv->chan[ch].head + 1) & (priv->fifo_len - 1);
smp_wmb();
request->desc = desc;
/* GO! */
wmb();
out_be32(priv->chan[ch].reg + TALITOS_FF,
upper_32_bits(request->dma_desc));
out_be32(priv->chan[ch].reg + TALITOS_FF_LO,
lower_32_bits(request->dma_desc));
spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);
return -EINPROGRESS;
}
EXPORT_SYMBOL(talitos_submit);
/*
* process what was done, notify callback of error if not
*/
static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
{
struct talitos_private *priv = dev_get_drvdata(dev);
struct talitos_request *request, saved_req;
unsigned long flags;
int tail, status;
bool is_sec1 = has_ftr_sec1(priv);
spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);
tail = priv->chan[ch].tail;
while (priv->chan[ch].fifo[tail].desc) {
__be32 hdr;
request = &priv->chan[ch].fifo[tail];
/* descriptors with their done bits set don't get the error */
rmb();
if (!is_sec1)
hdr = request->desc->hdr;
else if (request->desc->next_desc)
hdr = (request->desc + 1)->hdr1;
else
hdr = request->desc->hdr1;
if ((hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
status = 0;
else
if (!error)
break;
else
status = error;
dma_unmap_single(dev, request->dma_desc,
TALITOS_DESC_SIZE,
DMA_BIDIRECTIONAL);
/* copy entries so we can call callback outside lock */
saved_req.desc = request->desc;
saved_req.callback = request->callback;
saved_req.context = request->context;
/* release request entry in fifo */
smp_wmb();
request->desc = NULL;
/* increment fifo tail */
priv->chan[ch].tail = (tail + 1) & (priv->fifo_len - 1);
spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);
atomic_dec(&priv->chan[ch].submit_count);
saved_req.callback(dev, saved_req.desc, saved_req.context,
status);
/* channel may resume processing in single desc error case */
if (error && !reset_ch && status == error)
return;
spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);
tail = priv->chan[ch].tail;
}
spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);
}
/*
* process completed requests for channels that have done status
*/
#define DEF_TALITOS1_DONE(name, ch_done_mask) \
static void talitos1_done_##name(unsigned long data) \
{ \
struct device *dev = (struct device *)data; \
struct talitos_private *priv = dev_get_drvdata(dev); \
unsigned long flags; \
\
if (ch_done_mask & 0x10000000) \
flush_channel(dev, 0, 0, 0); \
if (ch_done_mask & 0x40000000) \
flush_channel(dev, 1, 0, 0); \
if (ch_done_mask & 0x00010000) \
flush_channel(dev, 2, 0, 0); \
if (ch_done_mask & 0x00040000) \
flush_channel(dev, 3, 0, 0); \
\
/* At this point, all completed channels have been processed */ \
/* Unmask done interrupts for channels completed later on. */ \
spin_lock_irqsave(&priv->reg_lock, flags); \
clrbits32(priv->reg + TALITOS_IMR, ch_done_mask); \
clrbits32(priv->reg + TALITOS_IMR_LO, TALITOS1_IMR_LO_INIT); \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
}
DEF_TALITOS1_DONE(4ch, TALITOS1_ISR_4CHDONE)
DEF_TALITOS1_DONE(ch0, TALITOS1_ISR_CH_0_DONE)
#define DEF_TALITOS2_DONE(name, ch_done_mask) \
static void talitos2_done_##name(unsigned long data) \
{ \
struct device *dev = (struct device *)data; \
struct talitos_private *priv = dev_get_drvdata(dev); \
unsigned long flags; \
\
if (ch_done_mask & 1) \
flush_channel(dev, 0, 0, 0); \
if (ch_done_mask & (1 << 2)) \
flush_channel(dev, 1, 0, 0); \
if (ch_done_mask & (1 << 4)) \
flush_channel(dev, 2, 0, 0); \
if (ch_done_mask & (1 << 6)) \
flush_channel(dev, 3, 0, 0); \
\
/* At this point, all completed channels have been processed */ \
/* Unmask done interrupts for channels completed later on. */ \
spin_lock_irqsave(&priv->reg_lock, flags); \
setbits32(priv->reg + TALITOS_IMR, ch_done_mask); \
setbits32(priv->reg + TALITOS_IMR_LO, TALITOS2_IMR_LO_INIT); \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
}
DEF_TALITOS2_DONE(4ch, TALITOS2_ISR_4CHDONE)
DEF_TALITOS2_DONE(ch0, TALITOS2_ISR_CH_0_DONE)
DEF_TALITOS2_DONE(ch0_2, TALITOS2_ISR_CH_0_2_DONE)
DEF_TALITOS2_DONE(ch1_3, TALITOS2_ISR_CH_1_3_DONE)
/*
* locate current (offending) descriptor
*/
static u32 current_desc_hdr(struct device *dev, int ch)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int tail, iter;
dma_addr_t cur_desc;
cur_desc = ((u64)in_be32(priv->chan[ch].reg + TALITOS_CDPR)) << 32;
cur_desc |= in_be32(priv->chan[ch].reg + TALITOS_CDPR_LO);
if (!cur_desc) {
dev_err(dev, "CDPR is NULL, giving up search for offending descriptor\n");
return 0;
}
tail = priv->chan[ch].tail;
iter = tail;
while (priv->chan[ch].fifo[iter].dma_desc != cur_desc &&
priv->chan[ch].fifo[iter].desc->next_desc != cur_desc) {
iter = (iter + 1) & (priv->fifo_len - 1);
if (iter == tail) {
dev_err(dev, "couldn't locate current descriptor\n");
return 0;
}
}
if (priv->chan[ch].fifo[iter].desc->next_desc == cur_desc)
return (priv->chan[ch].fifo[iter].desc + 1)->hdr;
return priv->chan[ch].fifo[iter].desc->hdr;
}
/*
* user diagnostics; report root cause of error based on execution unit status
*/
static void report_eu_error(struct device *dev, int ch, u32 desc_hdr)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int i;
if (!desc_hdr)
desc_hdr = in_be32(priv->chan[ch].reg + TALITOS_DESCBUF);
switch (desc_hdr & DESC_HDR_SEL0_MASK) {
case DESC_HDR_SEL0_AFEU:
dev_err(dev, "AFEUISR 0x%08x_%08x\n",
in_be32(priv->reg_afeu + TALITOS_EUISR),
in_be32(priv->reg_afeu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_DEU:
dev_err(dev, "DEUISR 0x%08x_%08x\n",
in_be32(priv->reg_deu + TALITOS_EUISR),
in_be32(priv->reg_deu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_MDEUA:
case DESC_HDR_SEL0_MDEUB:
dev_err(dev, "MDEUISR 0x%08x_%08x\n",
in_be32(priv->reg_mdeu + TALITOS_EUISR),
in_be32(priv->reg_mdeu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_RNG:
dev_err(dev, "RNGUISR 0x%08x_%08x\n",
in_be32(priv->reg_rngu + TALITOS_ISR),
in_be32(priv->reg_rngu + TALITOS_ISR_LO));
break;
case DESC_HDR_SEL0_PKEU:
dev_err(dev, "PKEUISR 0x%08x_%08x\n",
in_be32(priv->reg_pkeu + TALITOS_EUISR),
in_be32(priv->reg_pkeu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_AESU:
dev_err(dev, "AESUISR 0x%08x_%08x\n",
in_be32(priv->reg_aesu + TALITOS_EUISR),
in_be32(priv->reg_aesu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_CRCU:
dev_err(dev, "CRCUISR 0x%08x_%08x\n",
in_be32(priv->reg_crcu + TALITOS_EUISR),
in_be32(priv->reg_crcu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL0_KEU:
dev_err(dev, "KEUISR 0x%08x_%08x\n",
in_be32(priv->reg_pkeu + TALITOS_EUISR),
in_be32(priv->reg_pkeu + TALITOS_EUISR_LO));
break;
}
switch (desc_hdr & DESC_HDR_SEL1_MASK) {
case DESC_HDR_SEL1_MDEUA:
case DESC_HDR_SEL1_MDEUB:
dev_err(dev, "MDEUISR 0x%08x_%08x\n",
in_be32(priv->reg_mdeu + TALITOS_EUISR),
in_be32(priv->reg_mdeu + TALITOS_EUISR_LO));
break;
case DESC_HDR_SEL1_CRCU:
dev_err(dev, "CRCUISR 0x%08x_%08x\n",
in_be32(priv->reg_crcu + TALITOS_EUISR),
in_be32(priv->reg_crcu + TALITOS_EUISR_LO));
break;
}
for (i = 0; i < 8; i++)
dev_err(dev, "DESCBUF 0x%08x_%08x\n",
in_be32(priv->chan[ch].reg + TALITOS_DESCBUF + 8*i),
in_be32(priv->chan[ch].reg + TALITOS_DESCBUF_LO + 8*i));
}
/*
* recover from error interrupts
*/
static void talitos_error(struct device *dev, u32 isr, u32 isr_lo)
{
struct talitos_private *priv = dev_get_drvdata(dev);
unsigned int timeout = TALITOS_TIMEOUT;
int ch, error, reset_dev = 0;
u32 v_lo;
bool is_sec1 = has_ftr_sec1(priv);
int reset_ch = is_sec1 ? 1 : 0; /* only SEC2 supports continuation */
for (ch = 0; ch < priv->num_channels; ch++) {
/* skip channels without errors */
if (is_sec1) {
/* bits 29, 31, 17, 19 */
if (!(isr & (1 << (29 + (ch & 1) * 2 - (ch & 2) * 6))))
continue;
} else {
if (!(isr & (1 << (ch * 2 + 1))))
continue;
}
error = -EINVAL;
v_lo = in_be32(priv->chan[ch].reg + TALITOS_CCPSR_LO);
if (v_lo & TALITOS_CCPSR_LO_DOF) {
dev_err(dev, "double fetch fifo overflow error\n");
error = -EAGAIN;
reset_ch = 1;
}
if (v_lo & TALITOS_CCPSR_LO_SOF) {
/* h/w dropped descriptor */
dev_err(dev, "single fetch fifo overflow error\n");
error = -EAGAIN;
}
if (v_lo & TALITOS_CCPSR_LO_MDTE)
dev_err(dev, "master data transfer error\n");
if (v_lo & TALITOS_CCPSR_LO_SGDLZ)
dev_err(dev, is_sec1 ? "pointer not complete error\n"
: "s/g data length zero error\n");
if (v_lo & TALITOS_CCPSR_LO_FPZ)
dev_err(dev, is_sec1 ? "parity error\n"
: "fetch pointer zero error\n");
if (v_lo & TALITOS_CCPSR_LO_IDH)
dev_err(dev, "illegal descriptor header error\n");
if (v_lo & TALITOS_CCPSR_LO_IEU)
dev_err(dev, is_sec1 ? "static assignment error\n"
: "invalid exec unit error\n");
if (v_lo & TALITOS_CCPSR_LO_EU)
report_eu_error(dev, ch, current_desc_hdr(dev, ch));
if (!is_sec1) {
if (v_lo & TALITOS_CCPSR_LO_GB)
dev_err(dev, "gather boundary error\n");
if (v_lo & TALITOS_CCPSR_LO_GRL)
dev_err(dev, "gather return/length error\n");
if (v_lo & TALITOS_CCPSR_LO_SB)
dev_err(dev, "scatter boundary error\n");
if (v_lo & TALITOS_CCPSR_LO_SRL)
dev_err(dev, "scatter return/length error\n");
}
flush_channel(dev, ch, error, reset_ch);
if (reset_ch) {
reset_channel(dev, ch);
} else {
setbits32(priv->chan[ch].reg + TALITOS_CCCR,
TALITOS2_CCCR_CONT);
setbits32(priv->chan[ch].reg + TALITOS_CCCR_LO, 0);
while ((in_be32(priv->chan[ch].reg + TALITOS_CCCR) &
TALITOS2_CCCR_CONT) && --timeout)
cpu_relax();
if (timeout == 0) {
dev_err(dev, "failed to restart channel %d\n",
ch);
reset_dev = 1;
}
}
}
if (reset_dev || (is_sec1 && isr & ~TALITOS1_ISR_4CHERR) ||
(!is_sec1 && isr & ~TALITOS2_ISR_4CHERR) || isr_lo) {
if (is_sec1 && (isr_lo & TALITOS1_ISR_TEA_ERR))
dev_err(dev, "TEA error: ISR 0x%08x_%08x\n",
isr, isr_lo);
else
dev_err(dev, "done overflow, internal time out, or "
"rngu error: ISR 0x%08x_%08x\n", isr, isr_lo);
/* purge request queues */
for (ch = 0; ch < priv->num_channels; ch++)
flush_channel(dev, ch, -EIO, 1);
/* reset and reinitialize the device */
init_device(dev);
}
}
#define DEF_TALITOS1_INTERRUPT(name, ch_done_mask, ch_err_mask, tlet) \
static irqreturn_t talitos1_interrupt_##name(int irq, void *data) \
{ \
struct device *dev = data; \
struct talitos_private *priv = dev_get_drvdata(dev); \
u32 isr, isr_lo; \
unsigned long flags; \
\
spin_lock_irqsave(&priv->reg_lock, flags); \
isr = in_be32(priv->reg + TALITOS_ISR); \
isr_lo = in_be32(priv->reg + TALITOS_ISR_LO); \
/* Acknowledge interrupt */ \
out_be32(priv->reg + TALITOS_ICR, isr & (ch_done_mask | ch_err_mask)); \
out_be32(priv->reg + TALITOS_ICR_LO, isr_lo); \
\
if (unlikely(isr & ch_err_mask || isr_lo & TALITOS1_IMR_LO_INIT)) { \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
talitos_error(dev, isr & ch_err_mask, isr_lo); \
} \
else { \
if (likely(isr & ch_done_mask)) { \
/* mask further done interrupts. */ \
setbits32(priv->reg + TALITOS_IMR, ch_done_mask); \
/* done_task will unmask done interrupts at exit */ \
tasklet_schedule(&priv->done_task[tlet]); \
} \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
} \
\
return (isr & (ch_done_mask | ch_err_mask) || isr_lo) ? IRQ_HANDLED : \
IRQ_NONE; \
}
DEF_TALITOS1_INTERRUPT(4ch, TALITOS1_ISR_4CHDONE, TALITOS1_ISR_4CHERR, 0)
#define DEF_TALITOS2_INTERRUPT(name, ch_done_mask, ch_err_mask, tlet) \
static irqreturn_t talitos2_interrupt_##name(int irq, void *data) \
{ \
struct device *dev = data; \
struct talitos_private *priv = dev_get_drvdata(dev); \
u32 isr, isr_lo; \
unsigned long flags; \
\
spin_lock_irqsave(&priv->reg_lock, flags); \
isr = in_be32(priv->reg + TALITOS_ISR); \
isr_lo = in_be32(priv->reg + TALITOS_ISR_LO); \
/* Acknowledge interrupt */ \
out_be32(priv->reg + TALITOS_ICR, isr & (ch_done_mask | ch_err_mask)); \
out_be32(priv->reg + TALITOS_ICR_LO, isr_lo); \
\
if (unlikely(isr & ch_err_mask || isr_lo)) { \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
talitos_error(dev, isr & ch_err_mask, isr_lo); \
} \
else { \
if (likely(isr & ch_done_mask)) { \
/* mask further done interrupts. */ \
clrbits32(priv->reg + TALITOS_IMR, ch_done_mask); \
/* done_task will unmask done interrupts at exit */ \
tasklet_schedule(&priv->done_task[tlet]); \
} \
spin_unlock_irqrestore(&priv->reg_lock, flags); \
} \
\
return (isr & (ch_done_mask | ch_err_mask) || isr_lo) ? IRQ_HANDLED : \
IRQ_NONE; \
}
DEF_TALITOS2_INTERRUPT(4ch, TALITOS2_ISR_4CHDONE, TALITOS2_ISR_4CHERR, 0)
DEF_TALITOS2_INTERRUPT(ch0_2, TALITOS2_ISR_CH_0_2_DONE, TALITOS2_ISR_CH_0_2_ERR,
0)
DEF_TALITOS2_INTERRUPT(ch1_3, TALITOS2_ISR_CH_1_3_DONE, TALITOS2_ISR_CH_1_3_ERR,
1)
/*
* hwrng
*/
static int talitos_rng_data_present(struct hwrng *rng, int wait)
{
struct device *dev = (struct device *)rng->priv;
struct talitos_private *priv = dev_get_drvdata(dev);
u32 ofl;
int i;
for (i = 0; i < 20; i++) {
ofl = in_be32(priv->reg_rngu + TALITOS_EUSR_LO) &
TALITOS_RNGUSR_LO_OFL;
if (ofl || !wait)
break;
udelay(10);
}
return !!ofl;
}
static int talitos_rng_data_read(struct hwrng *rng, u32 *data)
{
struct device *dev = (struct device *)rng->priv;
struct talitos_private *priv = dev_get_drvdata(dev);
/* rng fifo requires 64-bit accesses */
*data = in_be32(priv->reg_rngu + TALITOS_EU_FIFO);
*data = in_be32(priv->reg_rngu + TALITOS_EU_FIFO_LO);
return sizeof(u32);
}
static int talitos_rng_init(struct hwrng *rng)
{
struct device *dev = (struct device *)rng->priv;
struct talitos_private *priv = dev_get_drvdata(dev);
unsigned int timeout = TALITOS_TIMEOUT;
setbits32(priv->reg_rngu + TALITOS_EURCR_LO, TALITOS_RNGURCR_LO_SR);
while (!(in_be32(priv->reg_rngu + TALITOS_EUSR_LO)
& TALITOS_RNGUSR_LO_RD)
&& --timeout)
cpu_relax();
if (timeout == 0) {
dev_err(dev, "failed to reset rng hw\n");
return -ENODEV;
}
/* start generating */
setbits32(priv->reg_rngu + TALITOS_EUDSR_LO, 0);
return 0;
}
static int talitos_register_rng(struct device *dev)
{
struct talitos_private *priv = dev_get_drvdata(dev);
int err;
priv->rng.name = dev_driver_string(dev),
priv->rng.init = talitos_rng_init,
priv->rng.data_present = talitos_rng_data_present,
priv->rng.data_read = talitos_rng_data_read,
priv->rng.priv = (unsigned long)dev;
err = hwrng_register(&priv->rng);
if (!err)
priv->rng_registered = true;
return err;
}
static void talitos_unregister_rng(struct device *dev)
{
struct talitos_private *priv = dev_get_drvdata(dev);
if (!priv->rng_registered)
return;
hwrng_unregister(&priv->rng);
priv->rng_registered = false;
}
/*
* crypto alg
*/
#define TALITOS_CRA_PRIORITY 3000
/*
* Defines a priority for doing AEAD with descriptors type
* HMAC_SNOOP_NO_AFEA (HSNA) instead of type IPSEC_ESP
*/
#define TALITOS_CRA_PRIORITY_AEAD_HSNA (TALITOS_CRA_PRIORITY - 1)
#define TALITOS_MAX_KEY_SIZE (AES_MAX_KEY_SIZE + SHA512_BLOCK_SIZE)
#define TALITOS_MAX_IV_LENGTH 16 /* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */
struct talitos_ctx {
struct device *dev;
int ch;
__be32 desc_hdr_template;
u8 key[TALITOS_MAX_KEY_SIZE];
u8 iv[TALITOS_MAX_IV_LENGTH];
dma_addr_t dma_key;
unsigned int keylen;
unsigned int enckeylen;
unsigned int authkeylen;
dma_addr_t dma_buf;
dma_addr_t dma_hw_context;
};
#define HASH_MAX_BLOCK_SIZE SHA512_BLOCK_SIZE
#define TALITOS_MDEU_MAX_CONTEXT_SIZE TALITOS_MDEU_CONTEXT_SIZE_SHA384_SHA512
struct talitos_ahash_req_ctx {
u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)];
unsigned int hw_context_size;
u8 buf[HASH_MAX_BLOCK_SIZE];
u8 bufnext[HASH_MAX_BLOCK_SIZE];
unsigned int swinit;
unsigned int first;
unsigned int last;
unsigned int to_hash_later;
unsigned int nbuf;
struct scatterlist bufsl[2];
struct scatterlist *psrc;
};
struct talitos_export_state {
u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)];
u8 buf[HASH_MAX_BLOCK_SIZE];
unsigned int swinit;
unsigned int first;
unsigned int last;
unsigned int to_hash_later;
unsigned int nbuf;
};
static int aead_setkey(struct crypto_aead *authenc,
const u8 *key, unsigned int keylen)
{
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
struct device *dev = ctx->dev;
struct crypto_authenc_keys keys;
if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
goto badkey;
if (keys.authkeylen + keys.enckeylen > TALITOS_MAX_KEY_SIZE)
goto badkey;
if (ctx->keylen)
dma_unmap_single(dev, ctx->dma_key, ctx->keylen, DMA_TO_DEVICE);
memcpy(ctx->key, keys.authkey, keys.authkeylen);
memcpy(&ctx->key[keys.authkeylen], keys.enckey, keys.enckeylen);
ctx->keylen = keys.authkeylen + keys.enckeylen;
ctx->enckeylen = keys.enckeylen;
ctx->authkeylen = keys.authkeylen;
ctx->dma_key = dma_map_single(dev, ctx->key, ctx->keylen,
DMA_TO_DEVICE);
return 0;
badkey:
crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
/*
* talitos_edesc - s/w-extended descriptor
* @src_nents: number of segments in input scatterlist
* @dst_nents: number of segments in output scatterlist
* @icv_ool: whether ICV is out-of-line
* @iv_dma: dma address of iv for checking continuity and link table
* @dma_len: length of dma mapped link_tbl space
* @dma_link_tbl: bus physical address of link_tbl/buf
* @desc: h/w descriptor
* @link_tbl: input and output h/w link tables (if {src,dst}_nents > 1) (SEC2)
* @buf: input and output buffeur (if {src,dst}_nents > 1) (SEC1)
*
* if decrypting (with authcheck), or either one of src_nents or dst_nents
* is greater than 1, an integrity check value is concatenated to the end
* of link_tbl data
*/
struct talitos_edesc {
int src_nents;
int dst_nents;
bool icv_ool;
dma_addr_t iv_dma;
int dma_len;
dma_addr_t dma_link_tbl;
struct talitos_desc desc;
union {
struct talitos_ptr link_tbl[0];
u8 buf[0];
};
};
static void talitos_sg_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct scatterlist *src,
struct scatterlist *dst,
unsigned int len, unsigned int offset)
{
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
unsigned int src_nents = edesc->src_nents ? : 1;
unsigned int dst_nents = edesc->dst_nents ? : 1;
if (is_sec1 && dst && dst_nents > 1) {
dma_sync_single_for_device(dev, edesc->dma_link_tbl + offset,
len, DMA_FROM_DEVICE);
sg_pcopy_from_buffer(dst, dst_nents, edesc->buf + offset, len,
offset);
}
if (src != dst) {
if (src_nents == 1 || !is_sec1)
dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
if (dst && (dst_nents == 1 || !is_sec1))
dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
} else if (src_nents == 1 || !is_sec1) {
dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
}
}
static void ipsec_esp_unmap(struct device *dev,
struct talitos_edesc *edesc,
struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct talitos_ctx *ctx = crypto_aead_ctx(aead);
unsigned int ivsize = crypto_aead_ivsize(aead);
bool is_ipsec_esp = edesc->desc.hdr & DESC_HDR_TYPE_IPSEC_ESP;
struct talitos_ptr *civ_ptr = &edesc->desc.ptr[is_ipsec_esp ? 2 : 3];
if (is_ipsec_esp)
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[6],
DMA_FROM_DEVICE);
unmap_single_talitos_ptr(dev, civ_ptr, DMA_TO_DEVICE);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst, areq->cryptlen,
areq->assoclen);
if (edesc->dma_len)
dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
DMA_BIDIRECTIONAL);
if (!is_ipsec_esp) {
unsigned int dst_nents = edesc->dst_nents ? : 1;
sg_pcopy_to_buffer(areq->dst, dst_nents, ctx->iv, ivsize,
areq->assoclen + areq->cryptlen - ivsize);
}
}
/*
* ipsec_esp descriptor callbacks
*/
static void ipsec_esp_encrypt_done(struct device *dev,
struct talitos_desc *desc, void *context,
int err)
{
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
struct aead_request *areq = context;
struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
unsigned int authsize = crypto_aead_authsize(authenc);
unsigned int ivsize = crypto_aead_ivsize(authenc);
struct talitos_edesc *edesc;
struct scatterlist *sg;