Driver for the AES engine in ECB and CBC modes found on some
Alchemy Au1200/Au1300 SoCs.
Signed-off-by: Manuel Lauss <manuel.lauss@xxxxxxxxx>
---
lightly "tested" with the tcrypt module on Au1200; I have no idea whether
it really works correctly:
# modprobe alchemy-aes
alg: skcipher: setkey failed on test 2 for ecb-aes-alchemy: flags=200000
# modprobe tcrypt mode=10
alg: skcipher: setkey failed on test 3 for cbc-aes-alchemy: flags=0
alg: skcipher: Failed to load transform for cbc(aes): -2
alg: skcipher: Failed to load transform for cbc(aes): -2
tcrypt: one or more tests failed!
FATAL: Error inserting tcrypt (/lib/modules/2.6.34-rc6-db1200-00214-g9f84af9/kernel/crypto/tcrypt.ko): Unknown symbol in module, or unknown parameter (see dmesg)
The error in "test 3 for cbc-aes-alchemy" probably comes from the inability
to process keys larger than 128 bits.
Please have a look.
Thanks!
drivers/crypto/Kconfig | 8 +
drivers/crypto/Makefile | 1 +
drivers/crypto/alchemy-aes.c | 579 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 588 insertions(+), 0 deletions(-)
create mode 100644 drivers/crypto/alchemy-aes.c
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index b08403d..7705b13 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -222,4 +222,12 @@ config CRYPTO_DEV_PPC4XX
help
This option allows you to have support for AMCC crypto acceleration.
+config CRYPTO_DEV_ALCHEMY_AES
+ tristate "Au1200/Au1300 AES engine"
+ depends on MACH_ALCHEMY
+ select CRYPTO_ALGAPI
+ select CRYPTO_BLKCIPHER
+ help
+ Driver for the AES engine in Alchemy Au1200/Au1300 series SoCs.
+
endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 6ffcb3f..624777f 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_CRYPTO_DEV_MV_CESA) += mv_cesa.o
obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o
obj-$(CONFIG_CRYPTO_DEV_IXP4XX) += ixp4xx_crypto.o
obj-$(CONFIG_CRYPTO_DEV_PPC4XX) += amcc/
+obj-$(CONFIG_CRYPTO_DEV_ALCHEMY_AES) += alchemy-aes.o
diff --git a/drivers/crypto/alchemy-aes.c b/drivers/crypto/alchemy-aes.c
new file mode 100644
index 0000000..14e8ace
--- /dev/null
+++ b/drivers/crypto/alchemy-aes.c
@@ -0,0 +1,579 @@
+/*
+ * alchemy-aes.c -- Driver for the Alchemy Au1200/Au1300 AES engine.
+ *
+ * (c) 2010 Manuel Lauss <manuel.lauss@xxxxxxxxx>
+ *
+ * Licensed under the GPLv2.
+ */
+
+#include <linux/crypto.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1xxx_dbdma.h>
+
+/*#define DEBUG*/
+
+#ifdef DEBUG
+#define DBG(x...) printk(KERN_ALERT "AES: " x)
+#define DBGHEX(x...) print_hex_dump(x)
+#else
+#define DBG(x...)
+#define DBGHEX(x...)
+#endif
+
+#define DRVNAME "alchemy-aes"
+
+/* the AES engine likes the number 16 */
+#define ALCHEMY_AES_KEY_SIZE 16
+#define ALCHEMY_AES_IV_SIZE 16
+#define ALCHEMY_AES_BLK_SIZE 16
+#define ALCHEMY_AES_DDMA_DSCRS 16
+
+/* register offsets */
+#define AES_STATUS 0x00
+#define AES_INDATA 0x04
+#define AES_OUTDATA 0x08
+#define AES_INTCAUSE 0x0c
+#define AES_CONFIG 0x10
+
+#define AES_S_PS 0x01 /* start crypto */
+#define AES_S_IE 0x02 /* int enable */
+#define AES_S_CR_1 0x00 /* periph. clock */
+#define AES_S_CR_2 0x04 /* periph. clock div 2 */
+#define AES_S_CR_4 0x08 /* periph. clock div 4 */
+#define AES_S_CR_8 0x0c /* periph. clock div 8 */
+#define AES_S_CR_MASK 0x0c
+#define AES_S_OUT 0x10 /* set if out fifo has space */
+#define AES_S_IN 0x20 /* set if in fifo has space */
+
+#define AES_CAUSE_RDY 0x01 /* process complete */
+#define AES_CAUSE_OVR 0x02 /* in fifo overflow */
+#define AES_CAUSE_UND 0x04 /* out fifo underflow */
+
+#define AES_C_ED 0x01 /* set to DE/clear to ENcrypt */
+#define AES_C_IKG 0x02 /* do internal key generation */
+#define AES_C_RPK 0x04 /* replay key (output 10th key) */
+#define AES_C_RK 0x08 /* reuse internal key store */
+#define AES_C_UC 0x10 /* undefined block count */
+#define AES_C_OP_ECB 0x00
+#define AES_C_OP_CBC 0x20
+#define AES_C_OP_CFB 0x40
+#define AES_C_OP_OFB 0x60
+#define AES_C_OP_MASK 0x60
+
+
+struct alchemy_aes_priv {
+ void __iomem *base;
+ int irq;
+
+ /* dbdma */
+ u32 dmatx;
+ u32 dmarx;
+ int txid;
+ int rxid;
+
+ unsigned char key[ALCHEMY_AES_KEY_SIZE];
+
+ struct completion done;
+ struct list_head alg_list;
+ struct resource *ioarea;
+};
+
+/* need to improvise to stash private data */
+struct alchemy_aes_alg {
+ struct crypto_alg alg;
+ struct alchemy_aes_priv *priv;
+ struct list_head entry;
+};
+
+#define crypto_alg_to_alchemy(a) \
+ container_of(a, struct alchemy_aes_alg, alg)
+
+
+/* 8 bit memory device */
+static dbdev_tab_t alchemy_aes_mem_dbdev = {
+ .dev_id = DSCR_CMD0_ALWAYS,
+ .dev_flags = DEV_FLAGS_ANYUSE,
+ .dev_tsize = 0,
+ .dev_devwidth = 8,
+ .dev_physaddr = 0x00000000,
+ .dev_intlevel = 0,
+ .dev_intpolarity = 0,
+};
+static int __alchemy_aes_memid;
+
+/**********************************************************************/
+
+static inline void aes_write(struct alchemy_aes_priv *p, int reg,
+ unsigned long val)
+{
+ __raw_writel(val, p->base + reg);
+}
+
+static inline unsigned long aes_read(struct alchemy_aes_priv *p, int reg)
+{
+ return __raw_readl(p->base + reg);
+}
+
+static inline void aes_infifo_write(struct alchemy_aes_priv *p,
+ unsigned long data)
+{
+ /* poll for open space */
+ while (!(aes_read(p, AES_STATUS) & AES_S_IN))
+ cpu_relax();
+ aes_write(p, AES_INDATA, data);
+}
+
+/**********************************************************************/
+
+static void alchemy_aes_dmacb(int irq, void *data)
+{
+ struct alchemy_aes_priv *p = data;
+
+ au1xxx_dbdma_stop(p->dmarx);
+ au1xxx_dbdma_stop(p->dmatx);
+
+ complete(&p->done);
+}
+
+static irqreturn_t alchemy_aes_irq(int irq, void *data)
+{
+ struct alchemy_aes_priv *p = data;
+ unsigned long istat;
+
+ istat = aes_read(p, AES_INTCAUSE);
+ aes_write(p, AES_INTCAUSE, 0);
+
+ if (istat & AES_CAUSE_RDY)
+ complete(&p->done);
+ /* fifo over/underruns shouldn't happen with DMA */
+
+ return IRQ_HANDLED;
+}
+
+/**********************************************************************/
+
+static int alchemy_aes_crypt(struct blkcipher_desc *desc,
+ struct scatterlist *sdst,
+ struct scatterlist *ssrc,
+ unsigned int nbytes,
+ unsigned long cryptmode)
+{
+ struct crypto_alg *alg = desc->tfm->base.__crt_alg;
+ struct alchemy_aes_alg *aa = crypto_alg_to_alchemy(alg);
+ struct alchemy_aes_priv *p = aa->priv;
+ struct blkcipher_walk walk;
+ int ret, i, blks, len;
+ unsigned long k;
+ dma_addr_t src, dst;
+ unsigned char *iv;
+
+ DBG("crypt: ALG %s base %p nbytes %d mode %08lx\n",
+ alg->cra_name, p->base, nbytes, cryptmode);
+
+ blkcipher_walk_init(&walk, sdst, ssrc, nbytes);
+ ret = blkcipher_walk_virt(desc, &walk);
+ iv = walk.iv;
+
+ /* create DMA descriptor lists */
+ i = blks = 0;
+ au1xxx_dbdma_reset(p->dmatx);
+ au1xxx_dbdma_reset(p->dmarx);
+ while ((nbytes = walk.nbytes)) {
+ src = (dma_addr_t)virt_to_phys(walk.src.virt.addr);
+ dst = (dma_addr_t)virt_to_phys(walk.dst.virt.addr);
+
+ blks += nbytes / ALCHEMY_AES_BLK_SIZE;
+ len = nbytes - (nbytes % ALCHEMY_AES_BLK_SIZE);
+
+ DBG("SRC %p DST %p bytes %d blks %d dscr %d len %d\n",
+ (void *)src, (void *)dst, nbytes, blks, i, len);
+ DBGHEX(KERN_ERR, "AES DATA ", 0, 16, 1, walk.src.virt.addr,
+ len, false);
+
+ nbytes -= len;
+ ret = blkcipher_walk_done(desc, &walk, nbytes);
+
+ /* let DBDMA interrupt when last block of data has been
+ * fetched from AES output fifo.
+ */
+ au1xxx_dbdma_put_dest(p->dmarx, dst, len,
+ walk.nbytes ? 0 : DDMA_FLAGS_IE);
+ au1xxx_dbdma_put_source(p->dmatx, src, len, 0);
+
+ if (++i > ALCHEMY_AES_DDMA_DSCRS) {
+ ret = -ENOMEM;
+ printk(KERN_ERR DRVNAME ": DMA descriptor limit"
+ " reached!\n");
+ goto out;
+ }
+ }
+
+ /* drain output fifo, clear interrupts, configure and enable */
+ init_completion(&p->done);
+ for (i = 0; i < 8; i++)
+ k = aes_read(p, AES_OUTDATA);
+ aes_write(p, AES_INTCAUSE, 0);
+ aes_write(p, AES_CONFIG, cryptmode);
+ aes_write(p, AES_STATUS, AES_S_PS | AES_S_IE); /* start engine */
+
+ /* block count comes first */
+ if (!(cryptmode & AES_C_UC)) {
+ DBG("BLKCNT %d\n", blks);
+ aes_infifo_write(p, blks);
+ }
+
+ /* then new key if necessary */
+ if (!(cryptmode & AES_C_RK)) {
+ DBGHEX(KERN_ERR, "AES: KEY ", 0, 16, 1, p->key, 16, false);
+
+ k = (p->key[0] << 24) | (p->key[1] << 16) |
+ (p->key[2] << 8) | p->key[3];
+ aes_infifo_write(p, k);
+ k = (p->key[4] << 24) | (p->key[5] << 16) |
+ (p->key[6] << 8) | p->key[7];
+ aes_infifo_write(p, k);
+ k = (p->key[8] << 24) | (p->key[9] << 16) |
+ (p->key[10] << 8) | p->key[11];
+ aes_infifo_write(p, k);
+ k = (p->key[12] << 24) | (p->key[13] << 16) |
+ (p->key[14] << 8) | p->key[15];
+ aes_infifo_write(p, k);
+ }
+
+ /* then IV for non-ECB modes */
+ if ((cryptmode & AES_C_OP_MASK) != AES_C_OP_ECB) {
+ DBGHEX(KERN_ERR, "AES: IV ", 0, 16, 1, iv, 16, false);
+
+ k = (iv[0] << 24) | (iv[1] << 16) |
+ (iv[2] << 8) | iv[3];
+ aes_infifo_write(p, k);
+ k = (iv[4] << 24) | (iv[5] << 16) |
+ (iv[6] << 8) | iv[7];
+ aes_infifo_write(p, k);
+ k = (iv[8] << 24) | (iv[9] << 16) |
+ (iv[10] << 8) | iv[11];
+ aes_infifo_write(p, k);
+ k = (iv[12] << 24) | (iv[13] << 16) |
+ (iv[14] << 8) | iv[15];
+ aes_infifo_write(p, k);
+ }
+
+ /* DMA engine does data transfer */
+ au1xxx_dbdma_start(p->dmarx);
+ au1xxx_dbdma_start(p->dmatx);
+ ret = wait_for_completion_interruptible(&p->done);
+
+out:
+ aes_write(p, AES_STATUS, 0);
+ au1xxx_dbdma_stop(p->dmatx);
+ au1xxx_dbdma_stop(p->dmarx);
+
+ /* read replayed key if necessary */
+ if ((!ret) && ((cryptmode & AES_C_OP_MASK) == AES_C_OP_ECB) &&
+ (cryptmode & (AES_C_ED | AES_C_RPK)) &&
+ (!(cryptmode & AES_C_UC))) {
+ k = aes_read(p, AES_OUTDATA);
+ k = aes_read(p, AES_OUTDATA);
+ k = aes_read(p, AES_OUTDATA);
+ k = aes_read(p, AES_OUTDATA);
+ /* FIXME: does cryptoapi acutally want it? */
+ }
+
+ return ret;
+}
+
+static int alchemy_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int len)
+{
+ struct crypto_alg *alg = tfm->__crt_alg;
+ struct alchemy_aes_alg *aa = crypto_alg_to_alchemy(alg);
+ struct alchemy_aes_priv *p = aa->priv;
+
+ DBGHEX(KERN_ERR, "AES: SETKEY ", 0, 16, 1, key, len, false);
+
+ if (len != AES_KEYSIZE_128) {
+ tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ return -EINVAL;
+ }
+
+ memcpy(p->key, key, ALCHEMY_AES_KEY_SIZE);
+ return 0;
+}
+
+static int alchemy_aes_ecb_enc(struct blkcipher_desc *desc,
+ struct scatterlist *dst,
+ struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return alchemy_aes_crypt(desc, dst, src, nbytes,
+ AES_C_OP_ECB);
+}
+
+static int alchemy_aes_ecb_dec(struct blkcipher_desc *desc,
+ struct scatterlist *dst,
+ struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return alchemy_aes_crypt(desc, dst, src, nbytes,
+ AES_C_OP_ECB | AES_C_ED);
+}
+
+static struct crypto_alg alchemy_aes_ecb_alg = {
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "ecb-aes-alchemy",
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = ALCHEMY_AES_KEY_SIZE,
+ .max_keysize = ALCHEMY_AES_KEY_SIZE,
+ .setkey = alchemy_aes_setkey,
+ .encrypt = alchemy_aes_ecb_enc,
+ .decrypt = alchemy_aes_ecb_dec,
+ },
+ },
+};
+
+static int alchemy_aes_cbc_enc(struct blkcipher_desc *desc,
+ struct scatterlist *dst,
+ struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return alchemy_aes_crypt(desc, dst, src, nbytes,
+ AES_C_OP_CBC);
+}
+
+static int alchemy_aes_cbc_dec(struct blkcipher_desc *desc,
+ struct scatterlist *dst,
+ struct scatterlist *src,
+ unsigned int nbytes)
+{
+ return alchemy_aes_crypt(desc, dst, src, nbytes,
+ AES_C_OP_CBC | AES_C_ED);
+}
+
+static struct crypto_alg alchemy_aes_cbc_alg = {
+ .cra_name = "cbc(aes)",
+ .cra_driver_name = "cbc-aes-alchemy",
+ .cra_u = {
+ .blkcipher = {
+ .min_keysize = ALCHEMY_AES_KEY_SIZE,
+ .max_keysize = ALCHEMY_AES_KEY_SIZE,
+ .ivsize = ALCHEMY_AES_IV_SIZE,
+ .setkey = alchemy_aes_setkey,
+ .encrypt = alchemy_aes_cbc_enc,
+ .decrypt = alchemy_aes_cbc_dec,
+ },
+ },
+};
+
+static int __init add_algo(struct alchemy_aes_priv *p,
+ struct crypto_alg *calg)
+{
+ struct alchemy_aes_alg *alg;
+ int ret;
+
+ alg = kzalloc(sizeof(struct alchemy_aes_alg), GFP_KERNEL);
+ if (!alg)
+ return -ENOMEM;
+
+ alg->priv = p;
+ alg->alg.cra_priority = 300;
+ alg->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_ASYNC;
+ alg->alg.cra_blocksize = ALCHEMY_AES_BLK_SIZE;
+ alg->alg.cra_ctxsize = 0;
+ alg->alg.cra_alignmask = 3;
+ alg->alg.cra_type = &crypto_blkcipher_type;
+ alg->alg.cra_module = THIS_MODULE;
+ INIT_LIST_HEAD(&alg->alg.cra_list);
+ alg->alg.cra_u.blkcipher = calg->cra_u.blkcipher;
+ sprintf(alg->alg.cra_name, "%s", calg->cra_name);
+ sprintf(alg->alg.cra_driver_name, "%s", calg->cra_driver_name);
+
+ list_add_tail(&alg->entry, &p->alg_list);
+
+ ret = crypto_register_alg(&alg->alg);
+ if (ret) {
+ list_del(&alg->entry);
+ kfree(alg);
+ }
+ return ret;
+}
+
+static void delete_algos(struct alchemy_aes_priv *p)
+{
+ struct alchemy_aes_alg *a, *n;
+
+ list_for_each_entry_safe(a, n, &p->alg_list, entry) {
+ list_del(&a->entry);
+ crypto_unregister_alg(&a->alg);
+ kfree(a);
+ }
+}
+
+static int __init alchemy_aes_probe(struct platform_device *pdev)
+{
+ struct resource *r;
+ struct alchemy_aes_priv *p;
+ int ret;
+
+ p = kzalloc(sizeof(struct alchemy_aes_priv), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ ret = -ENODEV;
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r)
+ goto out1;
+
+ p->ioarea = request_mem_region(r->start, resource_size(r),
+ DRVNAME);
+ if (!p->ioarea)
+ goto out1;
+
+ p->base = ioremap_nocache(r->start, resource_size(r));
+ if (!p->base)
+ goto out2;
+
+ r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!r)
+ goto out3;
+ p->irq = r->start;
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_DMA, "dmatx");
+ if (!r) {
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!r)
+ goto out3;
+ }
+ p->txid = r->start;
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_DMA, "dmarx");
+ if (!r) {
+ r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (!r)
+ goto out3;
+ }
+ p->rxid = r->start;
+
+ p->dmatx = au1xxx_dbdma_chan_alloc(__alchemy_aes_memid, p->txid,
+ alchemy_aes_dmacb, p);
+ if (!p->dmatx)
+ goto out3;
+
+ p->dmarx = au1xxx_dbdma_chan_alloc(p->rxid, __alchemy_aes_memid,
+ alchemy_aes_dmacb, p);
+ if (!p->dmarx)
+ goto out4;
+
+ au1xxx_dbdma_ring_alloc(p->dmatx, ALCHEMY_AES_DDMA_DSCRS);
+ au1xxx_dbdma_ring_alloc(p->dmarx, ALCHEMY_AES_DDMA_DSCRS);
+
+ aes_write(p, AES_STATUS, 0);
+ aes_write(p, AES_CONFIG, 0);
+ aes_write(p, AES_INTCAUSE, 0);
+
+ ret = request_irq(p->irq, alchemy_aes_irq, IRQF_DISABLED,
+ DRVNAME, p);
+ if (ret)
+ goto out5;
+
+ INIT_LIST_HEAD(&p->alg_list);
+
+ ret = add_algo(p, &alchemy_aes_ecb_alg);
+ if (ret)
+ goto out6;
+
+ ret = add_algo(p, &alchemy_aes_cbc_alg);
+ if (ret)
+ goto out6;
+
+ platform_set_drvdata(pdev, p);
+ return 0;
+
+out6:
+ delete_algos(p);
+ free_irq(p->irq, p);
+out5:
+ au1xxx_dbdma_chan_free(p->dmarx);
+out4:
+ au1xxx_dbdma_chan_free(p->dmatx);
+out3:
+ iounmap(p->base);
+out2:
+ release_resource(p->ioarea);
+ kfree(p->ioarea);
+out1:
+ kfree(p);
+ return ret;
+}
+
+static int __exit alchemy_aes_remove(struct platform_device *pdev)
+{
+ struct alchemy_aes_priv *p = platform_get_drvdata(pdev);
+
+ delete_algos(p);
+
+ au1xxx_dbdma_stop(p->dmatx);
+ au1xxx_dbdma_stop(p->dmarx);
+
+ aes_write(p, AES_STATUS, 0);
+ aes_write(p, AES_CONFIG, 0);
+ aes_write(p, AES_INTCAUSE, 0);
+
+ free_irq(p->irq, p);
+ au1xxx_dbdma_chan_free(p->dmarx);
+ au1xxx_dbdma_chan_free(p->dmatx);
+ iounmap(p->base);
+ release_resource(p->ioarea);
+ kfree(p->ioarea);
+ kfree(p);
+
+ return 0;
+}
+
+static struct platform_driver alchemy_aes_driver = {
+ .driver.name = DRVNAME,
+ .driver.owner = THIS_MODULE,
+ .probe = alchemy_aes_probe,
+ .remove = __devexit_p(alchemy_aes_remove),
+};
+
+static int __init alchemy_aes_load(void)
+{
+ /* FIXME: hier sollte auch noch der PRId des prozessors getestet
+ * werden; Au1210 (0x0503xxxx) und einige Au1300 haben lt. Daten-
+ * blatt keine AES engine.
+ */
+
+ /* need to do 8bit accesses to memory to get correct data */
+ __alchemy_aes_memid = au1xxx_ddma_add_device(&alchemy_aes_mem_dbdev);
+ if (!__alchemy_aes_memid)
+ return -ENODEV;
+
+ return platform_driver_register(&alchemy_aes_driver);
+}
+
+static void __exit alchemy_aes_unload(void)
+{
+ if (__alchemy_aes_memid)
+ au1xxx_ddma_del_device(__alchemy_aes_memid);
+ platform_driver_unregister(&alchemy_aes_driver);
+}
+
+module_init(alchemy_aes_load);
+module_exit(alchemy_aes_unload);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Alchemy Au1200 AES engine driver");
+MODULE_AUTHOR("Manuel Lauss <manuel.lauss@xxxxxxxxx>");
--
1.7.0.4
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