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openwrt_archive/target/linux/generic/files/crypto/ocf/pasemi/pasemi.c
John Crispin 9c28df101a generic: crypto: remove IRQF_DISABLED 
no-op since 2.6.35
    removed in Kernel 4.1
    see https://lwn.net/Articles/380931/

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 46671
2015-08-17 11:26:02 +00:00

1008 lines
26 KiB
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/*
* Copyright (C) 2007 PA Semi, Inc
*
* Driver for the PA Semi PWRficient DMA Crypto Engine
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
#include <linux/config.h>
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <asm/scatterlist.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <cryptodev.h>
#include <uio.h>
#include "pasemi_fnu.h"
#define DRV_NAME "pasemi"
#define TIMER_INTERVAL 1000
static void pasemi_dma_remove(struct pci_dev *pdev);
static struct pasdma_status volatile * dma_status;
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable debug");
static void pasemi_desc_start(struct pasemi_desc *desc, u64 hdr)
{
desc->postop = 0;
desc->quad[0] = hdr;
desc->quad_cnt = 1;
desc->size = 1;
}
static void pasemi_desc_build(struct pasemi_desc *desc, u64 val)
{
desc->quad[desc->quad_cnt++] = val;
desc->size = (desc->quad_cnt + 1) / 2;
}
static void pasemi_desc_hdr(struct pasemi_desc *desc, u64 hdr)
{
desc->quad[0] |= hdr;
}
static int pasemi_desc_size(struct pasemi_desc *desc)
{
return desc->size;
}
static void pasemi_ring_add_desc(
struct pasemi_fnu_txring *ring,
struct pasemi_desc *desc,
struct cryptop *crp) {
int i;
int ring_index = 2 * (ring->next_to_fill & (TX_RING_SIZE-1));
TX_DESC_INFO(ring, ring->next_to_fill).desc_size = desc->size;
TX_DESC_INFO(ring, ring->next_to_fill).desc_postop = desc->postop;
TX_DESC_INFO(ring, ring->next_to_fill).cf_crp = crp;
for (i = 0; i < desc->quad_cnt; i += 2) {
ring_index = 2 * (ring->next_to_fill & (TX_RING_SIZE-1));
ring->desc[ring_index] = desc->quad[i];
ring->desc[ring_index + 1] = desc->quad[i + 1];
ring->next_to_fill++;
}
if (desc->quad_cnt & 1)
ring->desc[ring_index + 1] = 0;
}
static void pasemi_ring_incr(struct pasemi_softc *sc, int chan_index, int incr)
{
out_le32(sc->dma_regs + PAS_DMA_TXCHAN_INCR(sc->base_chan + chan_index),
incr);
}
/*
* Generate a new software session.
*/
static int
pasemi_newsession(device_t dev, u_int32_t *sidp, struct cryptoini *cri)
{
struct cryptoini *c, *encini = NULL, *macini = NULL;
struct pasemi_softc *sc = device_get_softc(dev);
struct pasemi_session *ses = NULL, **sespp;
int sesn, blksz = 0;
u64 ccmd = 0;
unsigned long flags;
struct pasemi_desc init_desc;
struct pasemi_fnu_txring *txring;
DPRINTF("%s()\n", __FUNCTION__);
if (sidp == NULL || cri == NULL || sc == NULL) {
DPRINTF("%s,%d - EINVAL\n", __FILE__, __LINE__);
return -EINVAL;
}
for (c = cri; c != NULL; c = c->cri_next) {
if (ALG_IS_SIG(c->cri_alg)) {
if (macini)
return -EINVAL;
macini = c;
} else if (ALG_IS_CIPHER(c->cri_alg)) {
if (encini)
return -EINVAL;
encini = c;
} else {
DPRINTF("UNKNOWN c->cri_alg %d\n", c->cri_alg);
return -EINVAL;
}
}
if (encini == NULL && macini == NULL)
return -EINVAL;
if (encini) {
/* validate key length */
switch (encini->cri_alg) {
case CRYPTO_DES_CBC:
if (encini->cri_klen != 64)
return -EINVAL;
ccmd = DMA_CALGO_DES;
break;
case CRYPTO_3DES_CBC:
if (encini->cri_klen != 192)
return -EINVAL;
ccmd = DMA_CALGO_3DES;
break;
case CRYPTO_AES_CBC:
if (encini->cri_klen != 128 &&
encini->cri_klen != 192 &&
encini->cri_klen != 256)
return -EINVAL;
ccmd = DMA_CALGO_AES;
break;
case CRYPTO_ARC4:
if (encini->cri_klen != 128)
return -EINVAL;
ccmd = DMA_CALGO_ARC;
break;
default:
DPRINTF("UNKNOWN encini->cri_alg %d\n",
encini->cri_alg);
return -EINVAL;
}
}
if (macini) {
switch (macini->cri_alg) {
case CRYPTO_MD5:
case CRYPTO_MD5_HMAC:
blksz = 16;
break;
case CRYPTO_SHA1:
case CRYPTO_SHA1_HMAC:
blksz = 20;
break;
default:
DPRINTF("UNKNOWN macini->cri_alg %d\n",
macini->cri_alg);
return -EINVAL;
}
if (((macini->cri_klen + 7) / 8) > blksz) {
DPRINTF("key length %d bigger than blksize %d not supported\n",
((macini->cri_klen + 7) / 8), blksz);
return -EINVAL;
}
}
for (sesn = 0; sesn < sc->sc_nsessions; sesn++) {
if (sc->sc_sessions[sesn] == NULL) {
sc->sc_sessions[sesn] = (struct pasemi_session *)
kzalloc(sizeof(struct pasemi_session), GFP_ATOMIC);
ses = sc->sc_sessions[sesn];
break;
} else if (sc->sc_sessions[sesn]->used == 0) {
ses = sc->sc_sessions[sesn];
break;
}
}
if (ses == NULL) {
sespp = (struct pasemi_session **)
kzalloc(sc->sc_nsessions * 2 *
sizeof(struct pasemi_session *), GFP_ATOMIC);
if (sespp == NULL)
return -ENOMEM;
memcpy(sespp, sc->sc_sessions,
sc->sc_nsessions * sizeof(struct pasemi_session *));
kfree(sc->sc_sessions);
sc->sc_sessions = sespp;
sesn = sc->sc_nsessions;
ses = sc->sc_sessions[sesn] = (struct pasemi_session *)
kzalloc(sizeof(struct pasemi_session), GFP_ATOMIC);
if (ses == NULL)
return -ENOMEM;
sc->sc_nsessions *= 2;
}
ses->used = 1;
ses->dma_addr = pci_map_single(sc->dma_pdev, (void *) ses->civ,
sizeof(struct pasemi_session), DMA_TO_DEVICE);
/* enter the channel scheduler */
spin_lock_irqsave(&sc->sc_chnlock, flags);
/* ARC4 has to be processed by the even channel */
if (encini && (encini->cri_alg == CRYPTO_ARC4))
ses->chan = sc->sc_lastchn & ~1;
else
ses->chan = sc->sc_lastchn;
sc->sc_lastchn = (sc->sc_lastchn + 1) % sc->sc_num_channels;
spin_unlock_irqrestore(&sc->sc_chnlock, flags);
txring = &sc->tx[ses->chan];
if (encini) {
ses->ccmd = ccmd;
ses->keysz = (encini->cri_klen - 63) / 64;
memcpy(ses->key, encini->cri_key, (ses->keysz + 1) * 8);
pasemi_desc_start(&init_desc,
XCT_CTRL_HDR(ses->chan, (encini && macini) ? 0x68 : 0x40, DMA_FN_CIV0));
pasemi_desc_build(&init_desc,
XCT_FUN_SRC_PTR((encini && macini) ? 0x68 : 0x40, ses->dma_addr));
}
if (macini) {
if (macini->cri_alg == CRYPTO_MD5_HMAC ||
macini->cri_alg == CRYPTO_SHA1_HMAC)
memcpy(ses->hkey, macini->cri_key, blksz);
else {
/* Load initialization constants(RFC 1321, 3174) */
ses->hiv[0] = 0x67452301efcdab89ULL;
ses->hiv[1] = 0x98badcfe10325476ULL;
ses->hiv[2] = 0xc3d2e1f000000000ULL;
}
ses->hseq = 0ULL;
}
spin_lock_irqsave(&txring->fill_lock, flags);
if (((txring->next_to_fill + pasemi_desc_size(&init_desc)) -
txring->next_to_clean) > TX_RING_SIZE) {
spin_unlock_irqrestore(&txring->fill_lock, flags);
return ERESTART;
}
if (encini) {
pasemi_ring_add_desc(txring, &init_desc, NULL);
pasemi_ring_incr(sc, ses->chan,
pasemi_desc_size(&init_desc));
}
txring->sesn = sesn;
spin_unlock_irqrestore(&txring->fill_lock, flags);
*sidp = PASEMI_SID(sesn);
return 0;
}
/*
* Deallocate a session.
*/
static int
pasemi_freesession(device_t dev, u_int64_t tid)
{
struct pasemi_softc *sc = device_get_softc(dev);
int session;
u_int32_t sid = ((u_int32_t) tid) & 0xffffffff;
DPRINTF("%s()\n", __FUNCTION__);
if (sc == NULL)
return -EINVAL;
session = PASEMI_SESSION(sid);
if (session >= sc->sc_nsessions || !sc->sc_sessions[session])
return -EINVAL;
pci_unmap_single(sc->dma_pdev,
sc->sc_sessions[session]->dma_addr,
sizeof(struct pasemi_session), DMA_TO_DEVICE);
memset(sc->sc_sessions[session], 0,
sizeof(struct pasemi_session));
return 0;
}
static int
pasemi_process(device_t dev, struct cryptop *crp, int hint)
{
int err = 0, ivsize, srclen = 0, reinit = 0, reinit_size = 0, chsel;
struct pasemi_softc *sc = device_get_softc(dev);
struct cryptodesc *crd1, *crd2, *maccrd, *enccrd;
caddr_t ivp;
struct pasemi_desc init_desc, work_desc;
struct pasemi_session *ses;
struct sk_buff *skb;
struct uio *uiop;
unsigned long flags;
struct pasemi_fnu_txring *txring;
DPRINTF("%s()\n", __FUNCTION__);
if (crp == NULL || crp->crp_callback == NULL || sc == NULL)
return -EINVAL;
crp->crp_etype = 0;
if (PASEMI_SESSION(crp->crp_sid) >= sc->sc_nsessions)
return -EINVAL;
ses = sc->sc_sessions[PASEMI_SESSION(crp->crp_sid)];
crd1 = crp->crp_desc;
if (crd1 == NULL) {
err = -EINVAL;
goto errout;
}
crd2 = crd1->crd_next;
if (ALG_IS_SIG(crd1->crd_alg)) {
maccrd = crd1;
if (crd2 == NULL)
enccrd = NULL;
else if (ALG_IS_CIPHER(crd2->crd_alg) &&
(crd2->crd_flags & CRD_F_ENCRYPT) == 0)
enccrd = crd2;
else
goto erralg;
} else if (ALG_IS_CIPHER(crd1->crd_alg)) {
enccrd = crd1;
if (crd2 == NULL)
maccrd = NULL;
else if (ALG_IS_SIG(crd2->crd_alg) &&
(crd1->crd_flags & CRD_F_ENCRYPT))
maccrd = crd2;
else
goto erralg;
} else
goto erralg;
chsel = ses->chan;
txring = &sc->tx[chsel];
if (enccrd && !maccrd) {
if (enccrd->crd_alg == CRYPTO_ARC4)
reinit = 1;
reinit_size = 0x40;
srclen = crp->crp_ilen;
pasemi_desc_start(&work_desc, XCT_FUN_O | XCT_FUN_I
| XCT_FUN_FUN(chsel));
if (enccrd->crd_flags & CRD_F_ENCRYPT)
pasemi_desc_hdr(&work_desc, XCT_FUN_CRM_ENC);
else
pasemi_desc_hdr(&work_desc, XCT_FUN_CRM_DEC);
} else if (enccrd && maccrd) {
if (enccrd->crd_alg == CRYPTO_ARC4)
reinit = 1;
reinit_size = 0x68;
if (enccrd->crd_flags & CRD_F_ENCRYPT) {
/* Encrypt -> Authenticate */
pasemi_desc_start(&work_desc, XCT_FUN_O | XCT_FUN_I | XCT_FUN_CRM_ENC_SIG
| XCT_FUN_A | XCT_FUN_FUN(chsel));
srclen = maccrd->crd_skip + maccrd->crd_len;
} else {
/* Authenticate -> Decrypt */
pasemi_desc_start(&work_desc, XCT_FUN_O | XCT_FUN_I | XCT_FUN_CRM_SIG_DEC
| XCT_FUN_24BRES | XCT_FUN_FUN(chsel));
pasemi_desc_build(&work_desc, 0);
pasemi_desc_build(&work_desc, 0);
pasemi_desc_build(&work_desc, 0);
work_desc.postop = PASEMI_CHECK_SIG;
srclen = crp->crp_ilen;
}
pasemi_desc_hdr(&work_desc, XCT_FUN_SHL(maccrd->crd_skip / 4));
pasemi_desc_hdr(&work_desc, XCT_FUN_CHL(enccrd->crd_skip - maccrd->crd_skip));
} else if (!enccrd && maccrd) {
srclen = maccrd->crd_len;
pasemi_desc_start(&init_desc,
XCT_CTRL_HDR(chsel, 0x58, DMA_FN_HKEY0));
pasemi_desc_build(&init_desc,
XCT_FUN_SRC_PTR(0x58, ((struct pasemi_session *)ses->dma_addr)->hkey));
pasemi_desc_start(&work_desc, XCT_FUN_O | XCT_FUN_I | XCT_FUN_CRM_SIG
| XCT_FUN_A | XCT_FUN_FUN(chsel));
}
if (enccrd) {
switch (enccrd->crd_alg) {
case CRYPTO_3DES_CBC:
pasemi_desc_hdr(&work_desc, XCT_FUN_ALG_3DES |
XCT_FUN_BCM_CBC);
ivsize = sizeof(u64);
break;
case CRYPTO_DES_CBC:
pasemi_desc_hdr(&work_desc, XCT_FUN_ALG_DES |
XCT_FUN_BCM_CBC);
ivsize = sizeof(u64);
break;
case CRYPTO_AES_CBC:
pasemi_desc_hdr(&work_desc, XCT_FUN_ALG_AES |
XCT_FUN_BCM_CBC);
ivsize = 2 * sizeof(u64);
break;
case CRYPTO_ARC4:
pasemi_desc_hdr(&work_desc, XCT_FUN_ALG_ARC);
ivsize = 0;
break;
default:
printk(DRV_NAME ": unimplemented enccrd->crd_alg %d\n",
enccrd->crd_alg);
err = -EINVAL;
goto errout;
}
ivp = (ivsize == sizeof(u64)) ? (caddr_t) &ses->civ[1] : (caddr_t) &ses->civ[0];
if (enccrd->crd_flags & CRD_F_ENCRYPT) {
if (enccrd->crd_flags & CRD_F_IV_EXPLICIT)
memcpy(ivp, enccrd->crd_iv, ivsize);
else
read_random(ivp, ivsize);
/* If IV is not present in the buffer already, it has to be copied there */
if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0)
crypto_copyback(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, ivsize, ivp);
} else {
if (enccrd->crd_flags & CRD_F_IV_EXPLICIT)
/* IV is provided expicitly in descriptor */
memcpy(ivp, enccrd->crd_iv, ivsize);
else
/* IV is provided in the packet */
crypto_copydata(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, ivsize,
ivp);
}
}
if (maccrd) {
switch (maccrd->crd_alg) {
case CRYPTO_MD5:
pasemi_desc_hdr(&work_desc, XCT_FUN_SIG_MD5 |
XCT_FUN_HSZ((crp->crp_ilen - maccrd->crd_inject) / 4));
break;
case CRYPTO_SHA1:
pasemi_desc_hdr(&work_desc, XCT_FUN_SIG_SHA1 |
XCT_FUN_HSZ((crp->crp_ilen - maccrd->crd_inject) / 4));
break;
case CRYPTO_MD5_HMAC:
pasemi_desc_hdr(&work_desc, XCT_FUN_SIG_HMAC_MD5 |
XCT_FUN_HSZ((crp->crp_ilen - maccrd->crd_inject) / 4));
break;
case CRYPTO_SHA1_HMAC:
pasemi_desc_hdr(&work_desc, XCT_FUN_SIG_HMAC_SHA1 |
XCT_FUN_HSZ((crp->crp_ilen - maccrd->crd_inject) / 4));
break;
default:
printk(DRV_NAME ": unimplemented maccrd->crd_alg %d\n",
maccrd->crd_alg);
err = -EINVAL;
goto errout;
}
}
if (crp->crp_flags & CRYPTO_F_SKBUF) {
/* using SKB buffers */
skb = (struct sk_buff *)crp->crp_buf;
if (skb_shinfo(skb)->nr_frags) {
printk(DRV_NAME ": skb frags unimplemented\n");
err = -EINVAL;
goto errout;
}
pasemi_desc_build(
&work_desc,
XCT_FUN_DST_PTR(skb->len, pci_map_single(
sc->dma_pdev, skb->data,
skb->len, DMA_TO_DEVICE)));
pasemi_desc_build(
&work_desc,
XCT_FUN_SRC_PTR(
srclen, pci_map_single(
sc->dma_pdev, skb->data,
srclen, DMA_TO_DEVICE)));
pasemi_desc_hdr(&work_desc, XCT_FUN_LLEN(srclen));
} else if (crp->crp_flags & CRYPTO_F_IOV) {
/* using IOV buffers */
uiop = (struct uio *)crp->crp_buf;
if (uiop->uio_iovcnt > 1) {
printk(DRV_NAME ": iov frags unimplemented\n");
err = -EINVAL;
goto errout;
}
/* crp_olen is never set; always use crp_ilen */
pasemi_desc_build(
&work_desc,
XCT_FUN_DST_PTR(crp->crp_ilen, pci_map_single(
sc->dma_pdev,
uiop->uio_iov->iov_base,
crp->crp_ilen, DMA_TO_DEVICE)));
pasemi_desc_hdr(&work_desc, XCT_FUN_LLEN(srclen));
pasemi_desc_build(
&work_desc,
XCT_FUN_SRC_PTR(srclen, pci_map_single(
sc->dma_pdev,
uiop->uio_iov->iov_base,
srclen, DMA_TO_DEVICE)));
} else {
/* using contig buffers */
pasemi_desc_build(
&work_desc,
XCT_FUN_DST_PTR(crp->crp_ilen, pci_map_single(
sc->dma_pdev,
crp->crp_buf,
crp->crp_ilen, DMA_TO_DEVICE)));
pasemi_desc_build(
&work_desc,
XCT_FUN_SRC_PTR(srclen, pci_map_single(
sc->dma_pdev,
crp->crp_buf, srclen,
DMA_TO_DEVICE)));
pasemi_desc_hdr(&work_desc, XCT_FUN_LLEN(srclen));
}
spin_lock_irqsave(&txring->fill_lock, flags);
if (txring->sesn != PASEMI_SESSION(crp->crp_sid)) {
txring->sesn = PASEMI_SESSION(crp->crp_sid);
reinit = 1;
}
if (enccrd) {
pasemi_desc_start(&init_desc,
XCT_CTRL_HDR(chsel, reinit ? reinit_size : 0x10, DMA_FN_CIV0));
pasemi_desc_build(&init_desc,
XCT_FUN_SRC_PTR(reinit ? reinit_size : 0x10, ses->dma_addr));
}
if (((txring->next_to_fill + pasemi_desc_size(&init_desc) +
pasemi_desc_size(&work_desc)) -
txring->next_to_clean) > TX_RING_SIZE) {
spin_unlock_irqrestore(&txring->fill_lock, flags);
err = ERESTART;
goto errout;
}
pasemi_ring_add_desc(txring, &init_desc, NULL);
pasemi_ring_add_desc(txring, &work_desc, crp);
pasemi_ring_incr(sc, chsel,
pasemi_desc_size(&init_desc) +
pasemi_desc_size(&work_desc));
spin_unlock_irqrestore(&txring->fill_lock, flags);
mod_timer(&txring->crypto_timer, jiffies + TIMER_INTERVAL);
return 0;
erralg:
printk(DRV_NAME ": unsupported algorithm or algorithm order alg1 %d alg2 %d\n",
crd1->crd_alg, crd2->crd_alg);
err = -EINVAL;
errout:
if (err != ERESTART) {
crp->crp_etype = err;
crypto_done(crp);
}
return err;
}
static int pasemi_clean_tx(struct pasemi_softc *sc, int chan)
{
int i, j, ring_idx;
struct pasemi_fnu_txring *ring = &sc->tx[chan];
u16 delta_cnt;
int flags, loops = 10;
int desc_size;
struct cryptop *crp;
spin_lock_irqsave(&ring->clean_lock, flags);
while ((delta_cnt = (dma_status->tx_sta[sc->base_chan + chan]
& PAS_STATUS_PCNT_M) - ring->total_pktcnt)
&& loops--) {
for (i = 0; i < delta_cnt; i++) {
desc_size = TX_DESC_INFO(ring, ring->next_to_clean).desc_size;
crp = TX_DESC_INFO(ring, ring->next_to_clean).cf_crp;
if (crp) {
ring_idx = 2 * (ring->next_to_clean & (TX_RING_SIZE-1));
if (TX_DESC_INFO(ring, ring->next_to_clean).desc_postop & PASEMI_CHECK_SIG) {
/* Need to make sure signature matched,
* if not - return error */
if (!(ring->desc[ring_idx + 1] & (1ULL << 63)))
crp->crp_etype = -EINVAL;
}
crypto_done(TX_DESC_INFO(ring,
ring->next_to_clean).cf_crp);
TX_DESC_INFO(ring, ring->next_to_clean).cf_crp = NULL;
pci_unmap_single(
sc->dma_pdev,
XCT_PTR_ADDR_LEN(ring->desc[ring_idx + 1]),
PCI_DMA_TODEVICE);
ring->desc[ring_idx] = ring->desc[ring_idx + 1] = 0;
ring->next_to_clean++;
for (j = 1; j < desc_size; j++) {
ring_idx = 2 *
(ring->next_to_clean &
(TX_RING_SIZE-1));
pci_unmap_single(
sc->dma_pdev,
XCT_PTR_ADDR_LEN(ring->desc[ring_idx]),
PCI_DMA_TODEVICE);
if (ring->desc[ring_idx + 1])
pci_unmap_single(
sc->dma_pdev,
XCT_PTR_ADDR_LEN(
ring->desc[
ring_idx + 1]),
PCI_DMA_TODEVICE);
ring->desc[ring_idx] =
ring->desc[ring_idx + 1] = 0;
ring->next_to_clean++;
}
} else {
for (j = 0; j < desc_size; j++) {
ring_idx = 2 * (ring->next_to_clean & (TX_RING_SIZE-1));
ring->desc[ring_idx] =
ring->desc[ring_idx + 1] = 0;
ring->next_to_clean++;
}
}
}
ring->total_pktcnt += delta_cnt;
}
spin_unlock_irqrestore(&ring->clean_lock, flags);
return 0;
}
static void sweepup_tx(struct pasemi_softc *sc)
{
int i;
for (i = 0; i < sc->sc_num_channels; i++)
pasemi_clean_tx(sc, i);
}
static irqreturn_t pasemi_intr(int irq, void *arg, struct pt_regs *regs)
{
struct pasemi_softc *sc = arg;
unsigned int reg;
int chan = irq - sc->base_irq;
int chan_index = sc->base_chan + chan;
u64 stat = dma_status->tx_sta[chan_index];
DPRINTF("%s()\n", __FUNCTION__);
if (!(stat & PAS_STATUS_CAUSE_M))
return IRQ_NONE;
pasemi_clean_tx(sc, chan);
stat = dma_status->tx_sta[chan_index];
reg = PAS_IOB_DMA_TXCH_RESET_PINTC |
PAS_IOB_DMA_TXCH_RESET_PCNT(sc->tx[chan].total_pktcnt);
if (stat & PAS_STATUS_SOFT)
reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
out_le32(sc->iob_regs + PAS_IOB_DMA_TXCH_RESET(chan_index), reg);
return IRQ_HANDLED;
}
static int pasemi_dma_setup_tx_resources(struct pasemi_softc *sc, int chan)
{
u32 val;
int chan_index = chan + sc->base_chan;
int ret;
struct pasemi_fnu_txring *ring;
ring = &sc->tx[chan];
spin_lock_init(&ring->fill_lock);
spin_lock_init(&ring->clean_lock);
ring->desc_info = kzalloc(sizeof(struct pasemi_desc_info) *
TX_RING_SIZE, GFP_KERNEL);
if (!ring->desc_info)
return -ENOMEM;
/* Allocate descriptors */
ring->desc = dma_alloc_coherent(&sc->dma_pdev->dev,
TX_RING_SIZE *
2 * sizeof(u64),
&ring->dma, GFP_KERNEL);
if (!ring->desc)
return -ENOMEM;
memset((void *) ring->desc, 0, TX_RING_SIZE * 2 * sizeof(u64));
out_le32(sc->iob_regs + PAS_IOB_DMA_TXCH_RESET(chan_index), 0x30);
ring->total_pktcnt = 0;
out_le32(sc->dma_regs + PAS_DMA_TXCHAN_BASEL(chan_index),
PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
out_le32(sc->dma_regs + PAS_DMA_TXCHAN_BASEU(chan_index), val);
out_le32(sc->dma_regs + PAS_DMA_TXCHAN_CFG(chan_index),
PAS_DMA_TXCHAN_CFG_TY_FUNC |
PAS_DMA_TXCHAN_CFG_TATTR(chan) |
PAS_DMA_TXCHAN_CFG_WT(2));
/* enable tx channel */
out_le32(sc->dma_regs +
PAS_DMA_TXCHAN_TCMDSTA(chan_index),
PAS_DMA_TXCHAN_TCMDSTA_EN);
out_le32(sc->iob_regs + PAS_IOB_DMA_TXCH_CFG(chan_index),
PAS_IOB_DMA_TXCH_CFG_CNTTH(1000));
ring->next_to_fill = 0;
ring->next_to_clean = 0;
snprintf(ring->irq_name, sizeof(ring->irq_name),
"%s%d", "crypto", chan);
ring->irq = irq_create_mapping(NULL, sc->base_irq + chan);
ret = request_irq(ring->irq, (irq_handler_t)
pasemi_intr, 0, ring->irq_name, sc);
if (ret) {
printk(KERN_ERR DRV_NAME ": failed to hook irq %d ret %d\n",
ring->irq, ret);
ring->irq = -1;
return ret;
}
setup_timer(&ring->crypto_timer, (void *) sweepup_tx, (unsigned long) sc);
return 0;
}
static device_method_t pasemi_methods = {
/* crypto device methods */
DEVMETHOD(cryptodev_newsession, pasemi_newsession),
DEVMETHOD(cryptodev_freesession, pasemi_freesession),
DEVMETHOD(cryptodev_process, pasemi_process),
};
/* Set up the crypto device structure, private data,
* and anything else we need before we start */
static int
pasemi_dma_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct pasemi_softc *sc;
int ret, i;
DPRINTF(KERN_ERR "%s()\n", __FUNCTION__);
sc = kzalloc(sizeof(*sc), GFP_KERNEL);
if (!sc)
return -ENOMEM;
softc_device_init(sc, DRV_NAME, 1, pasemi_methods);
pci_set_drvdata(pdev, sc);
spin_lock_init(&sc->sc_chnlock);
sc->sc_sessions = (struct pasemi_session **)
kzalloc(PASEMI_INITIAL_SESSIONS *
sizeof(struct pasemi_session *), GFP_ATOMIC);
if (sc->sc_sessions == NULL) {
ret = -ENOMEM;
goto out;
}
sc->sc_nsessions = PASEMI_INITIAL_SESSIONS;
sc->sc_lastchn = 0;
sc->base_irq = pdev->irq + 6;
sc->base_chan = 6;
sc->sc_cid = -1;
sc->dma_pdev = pdev;
sc->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
if (!sc->iob_pdev) {
dev_err(&pdev->dev, "Can't find I/O Bridge\n");
ret = -ENODEV;
goto out;
}
/* This is hardcoded and ugly, but we have some firmware versions
* who don't provide the register space in the device tree. Luckily
* they are at well-known locations so we can just do the math here.
*/
sc->dma_regs =
ioremap(0xe0000000 + (sc->dma_pdev->devfn << 12), 0x2000);
sc->iob_regs =
ioremap(0xe0000000 + (sc->iob_pdev->devfn << 12), 0x2000);
if (!sc->dma_regs || !sc->iob_regs) {
dev_err(&pdev->dev, "Can't map registers\n");
ret = -ENODEV;
goto out;
}
dma_status = __ioremap(0xfd800000, 0x1000, 0);
if (!dma_status) {
ret = -ENODEV;
dev_err(&pdev->dev, "Can't map dmastatus space\n");
goto out;
}
sc->tx = (struct pasemi_fnu_txring *)
kzalloc(sizeof(struct pasemi_fnu_txring)
* 8, GFP_KERNEL);
if (!sc->tx) {
ret = -ENOMEM;
goto out;
}
/* Initialize the h/w */
out_le32(sc->dma_regs + PAS_DMA_COM_CFG,
(in_le32(sc->dma_regs + PAS_DMA_COM_CFG) |
PAS_DMA_COM_CFG_FWF));
out_le32(sc->dma_regs + PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
for (i = 0; i < PASEMI_FNU_CHANNELS; i++) {
sc->sc_num_channels++;
ret = pasemi_dma_setup_tx_resources(sc, i);
if (ret)
goto out;
}
sc->sc_cid = crypto_get_driverid(softc_get_device(sc),
CRYPTOCAP_F_HARDWARE);
if (sc->sc_cid < 0) {
printk(KERN_ERR DRV_NAME ": could not get crypto driver id\n");
ret = -ENXIO;
goto out;
}
/* register algorithms with the framework */
printk(DRV_NAME ":");
crypto_register(sc->sc_cid, CRYPTO_DES_CBC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_3DES_CBC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_ARC4, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA1, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_MD5, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0);
crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0);
return 0;
out:
pasemi_dma_remove(pdev);
return ret;
}
#define MAX_RETRIES 5000
static void pasemi_free_tx_resources(struct pasemi_softc *sc, int chan)
{
struct pasemi_fnu_txring *ring = &sc->tx[chan];
int chan_index = chan + sc->base_chan;
int retries;
u32 stat;
/* Stop the channel */
out_le32(sc->dma_regs +
PAS_DMA_TXCHAN_TCMDSTA(chan_index),
PAS_DMA_TXCHAN_TCMDSTA_ST);
for (retries = 0; retries < MAX_RETRIES; retries++) {
stat = in_le32(sc->dma_regs +
PAS_DMA_TXCHAN_TCMDSTA(chan_index));
if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
break;
cond_resched();
}
if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
dev_err(&sc->dma_pdev->dev, "Failed to stop tx channel %d\n",
chan_index);
/* Disable the channel */
out_le32(sc->dma_regs +
PAS_DMA_TXCHAN_TCMDSTA(chan_index),
0);
if (ring->desc_info)
kfree((void *) ring->desc_info);
if (ring->desc)
dma_free_coherent(&sc->dma_pdev->dev,
TX_RING_SIZE *
2 * sizeof(u64),
(void *) ring->desc, ring->dma);
if (ring->irq != -1)
free_irq(ring->irq, sc);
del_timer(&ring->crypto_timer);
}
static void pasemi_dma_remove(struct pci_dev *pdev)
{
struct pasemi_softc *sc = pci_get_drvdata(pdev);
int i;
DPRINTF("%s()\n", __FUNCTION__);
if (sc->sc_cid >= 0) {
crypto_unregister_all(sc->sc_cid);
}
if (sc->tx) {
for (i = 0; i < sc->sc_num_channels; i++)
pasemi_free_tx_resources(sc, i);
kfree(sc->tx);
}
if (sc->sc_sessions) {
for (i = 0; i < sc->sc_nsessions; i++)
kfree(sc->sc_sessions[i]);
kfree(sc->sc_sessions);
}
if (sc->iob_pdev)
pci_dev_put(sc->iob_pdev);
if (sc->dma_regs)
iounmap(sc->dma_regs);
if (sc->iob_regs)
iounmap(sc->iob_regs);
kfree(sc);
}
static struct pci_device_id pasemi_dma_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa007) },
};
MODULE_DEVICE_TABLE(pci, pasemi_dma_pci_tbl);
static struct pci_driver pasemi_dma_driver = {
.name = "pasemi_dma",
.id_table = pasemi_dma_pci_tbl,
.probe = pasemi_dma_probe,
.remove = pasemi_dma_remove,
};
static void __exit pasemi_dma_cleanup_module(void)
{
pci_unregister_driver(&pasemi_dma_driver);
__iounmap(dma_status);
dma_status = NULL;
}
int pasemi_dma_init_module(void)
{
return pci_register_driver(&pasemi_dma_driver);
}
module_init(pasemi_dma_init_module);
module_exit(pasemi_dma_cleanup_module);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Egor Martovetsky egor@pasemi.com");
MODULE_DESCRIPTION("OCF driver for PA Semi PWRficient DMA Crypto Engine");
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