diff options
Diffstat (limited to 'target/linux/generic/files/crypto/ocf/pasemi/pasemi.c')
| -rw-r--r-- | target/linux/generic/files/crypto/ocf/pasemi/pasemi.c | 1007 |
1 files changed, 1007 insertions, 0 deletions
diff --git a/target/linux/generic/files/crypto/ocf/pasemi/pasemi.c b/target/linux/generic/files/crypto/ocf/pasemi/pasemi.c new file mode 100644 index 000000000..1b4333cdd --- /dev/null +++ b/target/linux/generic/files/crypto/ocf/pasemi/pasemi.c @@ -0,0 +1,1007 @@ +/* + * 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 __devexit 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, IRQF_DISABLED, 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 __devinit +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 __devexit 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 = __devexit_p(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"); |