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linux/drivers/crypto/talitos.h
Aaron Sierra 35a3bb3d39 crypto: talitos - Prevent panic in probe error path 
The probe error path for this driver, for all intents and purposes,
is the talitos_remove() function due to the common "goto err_out".

Without this patch applied, talitos_remove() will panic under these
two conditions:

1. If the RNG device hasn't been registered via
   talitos_register_rng() prior to entry into talitos_remove(),
   then the attempt to unregister the RNG "device" will cause a panic.

2. If the priv->chan array has not been allocated prior to entry
   into talitos_remove(), then the per-channel FIFO cleanup will panic
   because of the dereference of that NULL "array".

Both of the above scenarios occur if talitos_probe_irq() fails.

This patch resolves issue #1 by introducing a boolean to mask the
hwrng_unregister() call in talitos_unregister_rng() if RNG device
registration was unsuccessful.

It resolves issue #2 by checking that priv->chan is not NULL in the
per-channel FIFO cleanup for loop.

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-08-10 23:19:05 +08:00

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/*
* Freescale SEC (talitos) device register and descriptor header defines
*
* Copyright (c) 2006-2011 Freescale Semiconductor, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#define TALITOS_TIMEOUT 100000
#define TALITOS1_MAX_DATA_LEN 32768
#define TALITOS2_MAX_DATA_LEN 65535
#define DESC_TYPE(desc_hdr) ((be32_to_cpu(desc_hdr) >> 3) & 0x1f)
#define PRIMARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 28) & 0xf)
#define SECONDARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 16) & 0xf)
/* descriptor pointer entry */
struct talitos_ptr {
union {
struct { /* SEC2 format */
__be16 len; /* length */
u8 j_extent; /* jump to sg link table and/or extent*/
u8 eptr; /* extended address */
};
struct { /* SEC1 format */
__be16 res;
__be16 len1; /* length */
};
};
__be32 ptr; /* address */
};
static const struct talitos_ptr zero_entry;
/* descriptor */
struct talitos_desc {
__be32 hdr; /* header high bits */
union {
__be32 hdr_lo; /* header low bits */
__be32 hdr1; /* header for SEC1 */
};
struct talitos_ptr ptr[7]; /* ptr/len pair array */
__be32 next_desc; /* next descriptor (SEC1) */
};
#define TALITOS_DESC_SIZE (sizeof(struct talitos_desc) - sizeof(__be32))
/**
* talitos_request - descriptor submission request
* @desc: descriptor pointer (kernel virtual)
* @dma_desc: descriptor's physical bus address
* @callback: whom to call when descriptor processing is done
* @context: caller context (optional)
*/
struct talitos_request {
struct talitos_desc *desc;
dma_addr_t dma_desc;
void (*callback) (struct device *dev, struct talitos_desc *desc,
void *context, int error);
void *context;
};
/* per-channel fifo management */
struct talitos_channel {
void __iomem *reg;
/* request fifo */
struct talitos_request *fifo;
/* number of requests pending in channel h/w fifo */
atomic_t submit_count ____cacheline_aligned;
/* request submission (head) lock */
spinlock_t head_lock ____cacheline_aligned;
/* index to next free descriptor request */
int head;
/* request release (tail) lock */
spinlock_t tail_lock ____cacheline_aligned;
/* index to next in-progress/done descriptor request */
int tail;
};
struct talitos_private {
struct device *dev;
struct platform_device *ofdev;
void __iomem *reg;
void __iomem *reg_deu;
void __iomem *reg_aesu;
void __iomem *reg_mdeu;
void __iomem *reg_afeu;
void __iomem *reg_rngu;
void __iomem *reg_pkeu;
void __iomem *reg_keu;
void __iomem *reg_crcu;
int irq[2];
/* SEC global registers lock */
spinlock_t reg_lock ____cacheline_aligned;
/* SEC version geometry (from device tree node) */
unsigned int num_channels;
unsigned int chfifo_len;
unsigned int exec_units;
unsigned int desc_types;
/* SEC Compatibility info */
unsigned long features;
/*
* length of the request fifo
* fifo_len is chfifo_len rounded up to next power of 2
* so we can use bitwise ops to wrap
*/
unsigned int fifo_len;
struct talitos_channel *chan;
/* next channel to be assigned next incoming descriptor */
atomic_t last_chan ____cacheline_aligned;
/* request callback tasklet */
struct tasklet_struct done_task[2];
/* list of registered algorithms */
struct list_head alg_list;
/* hwrng device */
struct hwrng rng;
bool rng_registered;
};
extern 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);
/* .features flag */
#define TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT 0x00000001
#define TALITOS_FTR_HW_AUTH_CHECK 0x00000002
#define TALITOS_FTR_SHA224_HWINIT 0x00000004
#define TALITOS_FTR_HMAC_OK 0x00000008
#define TALITOS_FTR_SEC1 0x00000010
/*
* If both CONFIG_CRYPTO_DEV_TALITOS1 and CONFIG_CRYPTO_DEV_TALITOS2 are
* defined, we check the features which are set according to the device tree.
* Otherwise, we answer true or false directly
*/
static inline bool has_ftr_sec1(struct talitos_private *priv)
{
#if defined(CONFIG_CRYPTO_DEV_TALITOS1) && defined(CONFIG_CRYPTO_DEV_TALITOS2)
return priv->features & TALITOS_FTR_SEC1 ? true : false;
#elif defined(CONFIG_CRYPTO_DEV_TALITOS1)
return true;
#else
return false;
#endif
}
/*
* TALITOS_xxx_LO addresses point to the low data bits (32-63) of the register
*/
#define ISR1_FORMAT(x) (((x) << 28) | ((x) << 16))
#define ISR2_FORMAT(x) (((x) << 4) | (x))
/* global register offset addresses */
#define TALITOS_MCR 0x1030 /* master control register */
#define TALITOS_MCR_RCA0 (1 << 15) /* remap channel 0 */
#define TALITOS_MCR_RCA1 (1 << 14) /* remap channel 1 */
#define TALITOS_MCR_RCA2 (1 << 13) /* remap channel 2 */
#define TALITOS_MCR_RCA3 (1 << 12) /* remap channel 3 */
#define TALITOS1_MCR_SWR 0x1000000 /* s/w reset */
#define TALITOS2_MCR_SWR 0x1 /* s/w reset */
#define TALITOS_MCR_LO 0x1034
#define TALITOS_IMR 0x1008 /* interrupt mask register */
/* enable channel IRQs */
#define TALITOS1_IMR_INIT ISR1_FORMAT(0xf)
#define TALITOS1_IMR_DONE ISR1_FORMAT(0x5) /* done IRQs */
/* enable channel IRQs */
#define TALITOS2_IMR_INIT (ISR2_FORMAT(0xf) | 0x10000)
#define TALITOS2_IMR_DONE ISR1_FORMAT(0x5) /* done IRQs */
#define TALITOS_IMR_LO 0x100C
#define TALITOS1_IMR_LO_INIT 0x2000000 /* allow RNGU error IRQs */
#define TALITOS2_IMR_LO_INIT 0x20000 /* allow RNGU error IRQs */
#define TALITOS_ISR 0x1010 /* interrupt status register */
#define TALITOS1_ISR_4CHERR ISR1_FORMAT(0xa) /* 4 ch errors mask */
#define TALITOS1_ISR_4CHDONE ISR1_FORMAT(0x5) /* 4 ch done mask */
#define TALITOS1_ISR_TEA_ERR 0x00000040
#define TALITOS2_ISR_4CHERR ISR2_FORMAT(0xa) /* 4 ch errors mask */
#define TALITOS2_ISR_4CHDONE ISR2_FORMAT(0x5) /* 4 ch done mask */
#define TALITOS2_ISR_CH_0_2_ERR ISR2_FORMAT(0x2) /* ch 0, 2 err mask */
#define TALITOS2_ISR_CH_0_2_DONE ISR2_FORMAT(0x1) /* ch 0, 2 done mask */
#define TALITOS2_ISR_CH_1_3_ERR ISR2_FORMAT(0x8) /* ch 1, 3 err mask */
#define TALITOS2_ISR_CH_1_3_DONE ISR2_FORMAT(0x4) /* ch 1, 3 done mask */
#define TALITOS_ISR_LO 0x1014
#define TALITOS_ICR 0x1018 /* interrupt clear register */
#define TALITOS_ICR_LO 0x101C
/* channel register address stride */
#define TALITOS_CH_BASE_OFFSET 0x1000 /* default channel map base */
#define TALITOS1_CH_STRIDE 0x1000
#define TALITOS2_CH_STRIDE 0x100
/* channel configuration register */
#define TALITOS_CCCR 0x8
#define TALITOS2_CCCR_CONT 0x2 /* channel continue on SEC2 */
#define TALITOS2_CCCR_RESET 0x1 /* channel reset on SEC2 */
#define TALITOS_CCCR_LO 0xc
#define TALITOS_CCCR_LO_IWSE 0x80 /* chan. ICCR writeback enab. */
#define TALITOS_CCCR_LO_EAE 0x20 /* extended address enable */
#define TALITOS_CCCR_LO_CDWE 0x10 /* chan. done writeback enab. */
#define TALITOS_CCCR_LO_NT 0x4 /* notification type */
#define TALITOS_CCCR_LO_CDIE 0x2 /* channel done IRQ enable */
#define TALITOS1_CCCR_LO_RESET 0x1 /* channel reset on SEC1 */
/* CCPSR: channel pointer status register */
#define TALITOS_CCPSR 0x10
#define TALITOS_CCPSR_LO 0x14
#define TALITOS_CCPSR_LO_DOF 0x8000 /* double FF write oflow error */
#define TALITOS_CCPSR_LO_SOF 0x4000 /* single FF write oflow error */
#define TALITOS_CCPSR_LO_MDTE 0x2000 /* master data transfer error */
#define TALITOS_CCPSR_LO_SGDLZ 0x1000 /* s/g data len zero error */
#define TALITOS_CCPSR_LO_FPZ 0x0800 /* fetch ptr zero error */
#define TALITOS_CCPSR_LO_IDH 0x0400 /* illegal desc hdr error */
#define TALITOS_CCPSR_LO_IEU 0x0200 /* invalid EU error */
#define TALITOS_CCPSR_LO_EU 0x0100 /* EU error detected */
#define TALITOS_CCPSR_LO_GB 0x0080 /* gather boundary error */
#define TALITOS_CCPSR_LO_GRL 0x0040 /* gather return/length error */
#define TALITOS_CCPSR_LO_SB 0x0020 /* scatter boundary error */
#define TALITOS_CCPSR_LO_SRL 0x0010 /* scatter return/length error */
/* channel fetch fifo register */
#define TALITOS_FF 0x48
#define TALITOS_FF_LO 0x4c
/* current descriptor pointer register */
#define TALITOS_CDPR 0x40
#define TALITOS_CDPR_LO 0x44
/* descriptor buffer register */
#define TALITOS_DESCBUF 0x80
#define TALITOS_DESCBUF_LO 0x84
/* gather link table */
#define TALITOS_GATHER 0xc0
#define TALITOS_GATHER_LO 0xc4
/* scatter link table */
#define TALITOS_SCATTER 0xe0
#define TALITOS_SCATTER_LO 0xe4
/* execution unit registers base */
#define TALITOS2_DEU 0x2000
#define TALITOS2_AESU 0x4000
#define TALITOS2_MDEU 0x6000
#define TALITOS2_AFEU 0x8000
#define TALITOS2_RNGU 0xa000
#define TALITOS2_PKEU 0xc000
#define TALITOS2_KEU 0xe000
#define TALITOS2_CRCU 0xf000
#define TALITOS12_AESU 0x4000
#define TALITOS12_DEU 0x5000
#define TALITOS12_MDEU 0x6000
#define TALITOS10_AFEU 0x8000
#define TALITOS10_DEU 0xa000
#define TALITOS10_MDEU 0xc000
#define TALITOS10_RNGU 0xe000
#define TALITOS10_PKEU 0x10000
#define TALITOS10_AESU 0x12000
/* execution unit interrupt status registers */
#define TALITOS_EUDSR 0x10 /* data size */
#define TALITOS_EUDSR_LO 0x14
#define TALITOS_EURCR 0x18 /* reset control*/
#define TALITOS_EURCR_LO 0x1c
#define TALITOS_EUSR 0x28 /* rng status */
#define TALITOS_EUSR_LO 0x2c
#define TALITOS_EUISR 0x30
#define TALITOS_EUISR_LO 0x34
#define TALITOS_EUICR 0x38 /* int. control */
#define TALITOS_EUICR_LO 0x3c
#define TALITOS_EU_FIFO 0x800 /* output FIFO */
#define TALITOS_EU_FIFO_LO 0x804 /* output FIFO */
/* DES unit */
#define TALITOS1_DEUICR_KPE 0x00200000 /* Key Parity Error */
/* message digest unit */
#define TALITOS_MDEUICR_LO_ICE 0x4000 /* integrity check IRQ enable */
/* random number unit */
#define TALITOS_RNGUSR_LO_RD 0x1 /* reset done */
#define TALITOS_RNGUSR_LO_OFL 0xff0000/* output FIFO length */
#define TALITOS_RNGURCR_LO_SR 0x1 /* software reset */
#define TALITOS_MDEU_CONTEXT_SIZE_MD5_SHA1_SHA256 0x28
#define TALITOS_MDEU_CONTEXT_SIZE_SHA384_SHA512 0x48
/*
* talitos descriptor header (hdr) bits
*/
/* written back when done */
#define DESC_HDR_DONE cpu_to_be32(0xff000000)
#define DESC_HDR_LO_ICCR1_MASK cpu_to_be32(0x00180000)
#define DESC_HDR_LO_ICCR1_PASS cpu_to_be32(0x00080000)
#define DESC_HDR_LO_ICCR1_FAIL cpu_to_be32(0x00100000)
/* primary execution unit select */
#define DESC_HDR_SEL0_MASK cpu_to_be32(0xf0000000)
#define DESC_HDR_SEL0_AFEU cpu_to_be32(0x10000000)
#define DESC_HDR_SEL0_DEU cpu_to_be32(0x20000000)
#define DESC_HDR_SEL0_MDEUA cpu_to_be32(0x30000000)
#define DESC_HDR_SEL0_MDEUB cpu_to_be32(0xb0000000)
#define DESC_HDR_SEL0_RNG cpu_to_be32(0x40000000)
#define DESC_HDR_SEL0_PKEU cpu_to_be32(0x50000000)
#define DESC_HDR_SEL0_AESU cpu_to_be32(0x60000000)
#define DESC_HDR_SEL0_KEU cpu_to_be32(0x70000000)
#define DESC_HDR_SEL0_CRCU cpu_to_be32(0x80000000)
/* primary execution unit mode (MODE0) and derivatives */
#define DESC_HDR_MODE0_ENCRYPT cpu_to_be32(0x00100000)
#define DESC_HDR_MODE0_AESU_CBC cpu_to_be32(0x00200000)
#define DESC_HDR_MODE0_DEU_CBC cpu_to_be32(0x00400000)
#define DESC_HDR_MODE0_DEU_3DES cpu_to_be32(0x00200000)
#define DESC_HDR_MODE0_MDEU_CONT cpu_to_be32(0x08000000)
#define DESC_HDR_MODE0_MDEU_INIT cpu_to_be32(0x01000000)
#define DESC_HDR_MODE0_MDEU_HMAC cpu_to_be32(0x00800000)
#define DESC_HDR_MODE0_MDEU_PAD cpu_to_be32(0x00400000)
#define DESC_HDR_MODE0_MDEU_SHA224 cpu_to_be32(0x00300000)
#define DESC_HDR_MODE0_MDEU_MD5 cpu_to_be32(0x00200000)
#define DESC_HDR_MODE0_MDEU_SHA256 cpu_to_be32(0x00100000)
#define DESC_HDR_MODE0_MDEU_SHA1 cpu_to_be32(0x00000000)
#define DESC_HDR_MODE0_MDEUB_SHA384 cpu_to_be32(0x00000000)
#define DESC_HDR_MODE0_MDEUB_SHA512 cpu_to_be32(0x00200000)
#define DESC_HDR_MODE0_MDEU_MD5_HMAC (DESC_HDR_MODE0_MDEU_MD5 | \
DESC_HDR_MODE0_MDEU_HMAC)
#define DESC_HDR_MODE0_MDEU_SHA256_HMAC (DESC_HDR_MODE0_MDEU_SHA256 | \
DESC_HDR_MODE0_MDEU_HMAC)
#define DESC_HDR_MODE0_MDEU_SHA1_HMAC (DESC_HDR_MODE0_MDEU_SHA1 | \
DESC_HDR_MODE0_MDEU_HMAC)
/* secondary execution unit select (SEL1) */
#define DESC_HDR_SEL1_MASK cpu_to_be32(0x000f0000)
#define DESC_HDR_SEL1_MDEUA cpu_to_be32(0x00030000)
#define DESC_HDR_SEL1_MDEUB cpu_to_be32(0x000b0000)
#define DESC_HDR_SEL1_CRCU cpu_to_be32(0x00080000)
/* secondary execution unit mode (MODE1) and derivatives */
#define DESC_HDR_MODE1_MDEU_CICV cpu_to_be32(0x00004000)
#define DESC_HDR_MODE1_MDEU_INIT cpu_to_be32(0x00001000)
#define DESC_HDR_MODE1_MDEU_HMAC cpu_to_be32(0x00000800)
#define DESC_HDR_MODE1_MDEU_PAD cpu_to_be32(0x00000400)
#define DESC_HDR_MODE1_MDEU_SHA224 cpu_to_be32(0x00000300)
#define DESC_HDR_MODE1_MDEU_MD5 cpu_to_be32(0x00000200)
#define DESC_HDR_MODE1_MDEU_SHA256 cpu_to_be32(0x00000100)
#define DESC_HDR_MODE1_MDEU_SHA1 cpu_to_be32(0x00000000)
#define DESC_HDR_MODE1_MDEUB_SHA384 cpu_to_be32(0x00000000)
#define DESC_HDR_MODE1_MDEUB_SHA512 cpu_to_be32(0x00000200)
#define DESC_HDR_MODE1_MDEU_MD5_HMAC (DESC_HDR_MODE1_MDEU_MD5 | \
DESC_HDR_MODE1_MDEU_HMAC)
#define DESC_HDR_MODE1_MDEU_SHA256_HMAC (DESC_HDR_MODE1_MDEU_SHA256 | \
DESC_HDR_MODE1_MDEU_HMAC)
#define DESC_HDR_MODE1_MDEU_SHA1_HMAC (DESC_HDR_MODE1_MDEU_SHA1 | \
DESC_HDR_MODE1_MDEU_HMAC)
#define DESC_HDR_MODE1_MDEU_SHA224_HMAC (DESC_HDR_MODE1_MDEU_SHA224 | \
DESC_HDR_MODE1_MDEU_HMAC)
#define DESC_HDR_MODE1_MDEUB_SHA384_HMAC (DESC_HDR_MODE1_MDEUB_SHA384 | \
DESC_HDR_MODE1_MDEU_HMAC)
#define DESC_HDR_MODE1_MDEUB_SHA512_HMAC (DESC_HDR_MODE1_MDEUB_SHA512 | \
DESC_HDR_MODE1_MDEU_HMAC)
/* direction of overall data flow (DIR) */
#define DESC_HDR_DIR_INBOUND cpu_to_be32(0x00000002)
/* request done notification (DN) */
#define DESC_HDR_DONE_NOTIFY cpu_to_be32(0x00000001)
/* descriptor types */
#define DESC_HDR_TYPE_AESU_CTR_NONSNOOP cpu_to_be32(0 << 3)
#define DESC_HDR_TYPE_IPSEC_ESP cpu_to_be32(1 << 3)
#define DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU cpu_to_be32(2 << 3)
#define DESC_HDR_TYPE_HMAC_SNOOP_NO_AFEU cpu_to_be32(4 << 3)
/* link table extent field bits */
#define DESC_PTR_LNKTBL_JUMP 0x80
#define DESC_PTR_LNKTBL_RETURN 0x02
#define DESC_PTR_LNKTBL_NEXT 0x01
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