u-boot/drivers/crypto/fsl/jr.c
Ruchika Gupta c5de15cbc8 crypto/fsl: Add command for encapsulating/decapsulating blobs
Freescale's SEC block has built-in Blob Protocol which provides
a method for protecting user-defined data across system power
cycles. SEC block protects data in a data structure called a Blob,
which provides both confidentiality and integrity protection.

Encapsulating data as a blob
Each time that the Blob Protocol is used to protect data, a
different randomly generated key is used to encrypt the data.
This random key is itself encrypted using a key which is derived
from SoC's non volatile secret key and a 16 bit Key identifier.
The resulting encrypted key along with encrypted data is called a blob.
The non volatile secure key is available for use only during secure boot.

During decapsulation, the reverse process is performed to get back
the original data.

Commands added
--------------
    blob enc - encapsulating data as a cryptgraphic blob
    blob dec - decapsulating cryptgraphic blob to get the data

Commands Syntax
---------------
	blob enc src dst len km

	Encapsulate and create blob of data $len bytes long
	at address $src and store the result at address $dst.
	$km is the 16 byte key modifier is also required for
	generation/use as key for cryptographic operation. Key
	modifier should be 16 byte long.

	blob dec src dst len km

	Decapsulate the  blob of data at address $src and
	store result of $len byte at addr $dst.
	$km is the 16 byte key modifier is also required for
	generation/use as key for cryptographic operation. Key
	modifier should be 16 byte long.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2014-10-16 14:20:40 -07:00

462 lines
11 KiB
C

/*
* Copyright 2008-2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*
* Based on CAAM driver in drivers/crypto/caam in Linux
*/
#include <common.h>
#include <malloc.h>
#include "fsl_sec.h"
#include "jr.h"
#include "jobdesc.h"
#define CIRC_CNT(head, tail, size) (((head) - (tail)) & (size - 1))
#define CIRC_SPACE(head, tail, size) CIRC_CNT((tail), (head) + 1, (size))
struct jobring jr;
static inline void start_jr0(void)
{
ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
u32 ctpr_ms = sec_in32(&sec->ctpr_ms);
u32 scfgr = sec_in32(&sec->scfgr);
if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_INCL) {
/* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
* VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SEC_SCFGR_VIRT_EN = 1
*/
if ((ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) ||
(!(ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR) &&
(scfgr & SEC_SCFGR_VIRT_EN)))
sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
} else {
/* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
if (ctpr_ms & SEC_CTPR_MS_VIRT_EN_POR)
sec_out32(&sec->jrstartr, CONFIG_JRSTARTR_JR0);
}
}
static inline void jr_reset_liodn(void)
{
ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
sec_out32(&sec->jrliodnr[0].ls, 0);
}
static inline void jr_disable_irq(void)
{
struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
uint32_t jrcfg = sec_in32(&regs->jrcfg1);
jrcfg = jrcfg | JR_INTMASK;
sec_out32(&regs->jrcfg1, jrcfg);
}
static void jr_initregs(void)
{
struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
phys_addr_t ip_base = virt_to_phys((void *)jr.input_ring);
phys_addr_t op_base = virt_to_phys((void *)jr.output_ring);
#ifdef CONFIG_PHYS_64BIT
sec_out32(&regs->irba_h, ip_base >> 32);
#else
sec_out32(&regs->irba_h, 0x0);
#endif
sec_out32(&regs->irba_l, (uint32_t)ip_base);
#ifdef CONFIG_PHYS_64BIT
sec_out32(&regs->orba_h, op_base >> 32);
#else
sec_out32(&regs->orba_h, 0x0);
#endif
sec_out32(&regs->orba_l, (uint32_t)op_base);
sec_out32(&regs->ors, JR_SIZE);
sec_out32(&regs->irs, JR_SIZE);
if (!jr.irq)
jr_disable_irq();
}
static int jr_init(void)
{
memset(&jr, 0, sizeof(struct jobring));
jr.jq_id = DEFAULT_JR_ID;
jr.irq = DEFAULT_IRQ;
#ifdef CONFIG_FSL_CORENET
jr.liodn = DEFAULT_JR_LIODN;
#endif
jr.size = JR_SIZE;
jr.input_ring = (dma_addr_t *)malloc(JR_SIZE * sizeof(dma_addr_t));
if (!jr.input_ring)
return -1;
jr.output_ring =
(struct op_ring *)malloc(JR_SIZE * sizeof(struct op_ring));
if (!jr.output_ring)
return -1;
memset(jr.input_ring, 0, JR_SIZE * sizeof(dma_addr_t));
memset(jr.output_ring, 0, JR_SIZE * sizeof(struct op_ring));
start_jr0();
jr_initregs();
return 0;
}
static int jr_sw_cleanup(void)
{
jr.head = 0;
jr.tail = 0;
jr.read_idx = 0;
jr.write_idx = 0;
memset(jr.info, 0, sizeof(jr.info));
memset(jr.input_ring, 0, jr.size * sizeof(dma_addr_t));
memset(jr.output_ring, 0, jr.size * sizeof(struct op_ring));
return 0;
}
static int jr_hw_reset(void)
{
struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
uint32_t timeout = 100000;
uint32_t jrint, jrcr;
sec_out32(&regs->jrcr, JRCR_RESET);
do {
jrint = sec_in32(&regs->jrint);
} while (((jrint & JRINT_ERR_HALT_MASK) ==
JRINT_ERR_HALT_INPROGRESS) && --timeout);
jrint = sec_in32(&regs->jrint);
if (((jrint & JRINT_ERR_HALT_MASK) !=
JRINT_ERR_HALT_INPROGRESS) && timeout == 0)
return -1;
timeout = 100000;
sec_out32(&regs->jrcr, JRCR_RESET);
do {
jrcr = sec_in32(&regs->jrcr);
} while ((jrcr & JRCR_RESET) && --timeout);
if (timeout == 0)
return -1;
return 0;
}
/* -1 --- error, can't enqueue -- no space available */
static int jr_enqueue(uint32_t *desc_addr,
void (*callback)(uint32_t desc, uint32_t status, void *arg),
void *arg)
{
struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
int head = jr.head;
dma_addr_t desc_phys_addr = virt_to_phys(desc_addr);
if (sec_in32(&regs->irsa) == 0 ||
CIRC_SPACE(jr.head, jr.tail, jr.size) <= 0)
return -1;
jr.input_ring[head] = desc_phys_addr;
jr.info[head].desc_phys_addr = desc_phys_addr;
jr.info[head].desc_addr = (uint32_t)desc_addr;
jr.info[head].callback = (void *)callback;
jr.info[head].arg = arg;
jr.info[head].op_done = 0;
jr.head = (head + 1) & (jr.size - 1);
sec_out32(&regs->irja, 1);
return 0;
}
static int jr_dequeue(void)
{
struct jr_regs *regs = (struct jr_regs *)CONFIG_SYS_FSL_JR0_ADDR;
int head = jr.head;
int tail = jr.tail;
int idx, i, found;
void (*callback)(uint32_t desc, uint32_t status, void *arg);
void *arg = NULL;
while (sec_in32(&regs->orsf) && CIRC_CNT(jr.head, jr.tail, jr.size)) {
found = 0;
dma_addr_t op_desc = jr.output_ring[jr.tail].desc;
uint32_t status = jr.output_ring[jr.tail].status;
uint32_t desc_virt;
for (i = 0; CIRC_CNT(head, tail + i, jr.size) >= 1; i++) {
idx = (tail + i) & (jr.size - 1);
if (op_desc == jr.info[idx].desc_phys_addr) {
desc_virt = jr.info[idx].desc_addr;
found = 1;
break;
}
}
/* Error condition if match not found */
if (!found)
return -1;
jr.info[idx].op_done = 1;
callback = (void *)jr.info[idx].callback;
arg = jr.info[idx].arg;
/* When the job on tail idx gets done, increment
* tail till the point where job completed out of oredr has
* been taken into account
*/
if (idx == tail)
do {
tail = (tail + 1) & (jr.size - 1);
} while (jr.info[tail].op_done);
jr.tail = tail;
jr.read_idx = (jr.read_idx + 1) & (jr.size - 1);
sec_out32(&regs->orjr, 1);
jr.info[idx].op_done = 0;
callback(desc_virt, status, arg);
}
return 0;
}
static void desc_done(uint32_t desc, uint32_t status, void *arg)
{
struct result *x = arg;
x->status = status;
caam_jr_strstatus(status);
x->done = 1;
}
int run_descriptor_jr(uint32_t *desc)
{
unsigned long long timeval = get_ticks();
unsigned long long timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
struct result op;
int ret = 0;
memset(&op, sizeof(op), 0);
ret = jr_enqueue(desc, desc_done, &op);
if (ret) {
debug("Error in SEC enq\n");
ret = JQ_ENQ_ERR;
goto out;
}
timeval = get_ticks();
timeout = usec2ticks(CONFIG_SEC_DEQ_TIMEOUT);
while (op.done != 1) {
ret = jr_dequeue();
if (ret) {
debug("Error in SEC deq\n");
ret = JQ_DEQ_ERR;
goto out;
}
if ((get_ticks() - timeval) > timeout) {
debug("SEC Dequeue timed out\n");
ret = JQ_DEQ_TO_ERR;
goto out;
}
}
if (!op.status) {
debug("Error %x\n", op.status);
ret = op.status;
}
out:
return ret;
}
int jr_reset(void)
{
if (jr_hw_reset() < 0)
return -1;
/* Clean up the jobring structure maintained by software */
jr_sw_cleanup();
return 0;
}
int sec_reset(void)
{
ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
uint32_t mcfgr = sec_in32(&sec->mcfgr);
uint32_t timeout = 100000;
mcfgr |= MCFGR_SWRST;
sec_out32(&sec->mcfgr, mcfgr);
mcfgr |= MCFGR_DMA_RST;
sec_out32(&sec->mcfgr, mcfgr);
do {
mcfgr = sec_in32(&sec->mcfgr);
} while ((mcfgr & MCFGR_DMA_RST) == MCFGR_DMA_RST && --timeout);
if (timeout == 0)
return -1;
timeout = 100000;
do {
mcfgr = sec_in32(&sec->mcfgr);
} while ((mcfgr & MCFGR_SWRST) == MCFGR_SWRST && --timeout);
if (timeout == 0)
return -1;
return 0;
}
static int instantiate_rng(void)
{
struct result op;
u32 *desc;
u32 rdsta_val;
int ret = 0;
ccsr_sec_t __iomem *sec =
(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
struct rng4tst __iomem *rng =
(struct rng4tst __iomem *)&sec->rng;
memset(&op, 0, sizeof(struct result));
desc = malloc(sizeof(int) * 6);
if (!desc) {
printf("cannot allocate RNG init descriptor memory\n");
return -1;
}
inline_cnstr_jobdesc_rng_instantiation(desc);
ret = run_descriptor_jr(desc);
if (ret)
printf("RNG: Instantiation failed with error %x\n", ret);
rdsta_val = sec_in32(&rng->rdsta);
if (op.status || !(rdsta_val & RNG_STATE0_HANDLE_INSTANTIATED))
return -1;
return ret;
}
static u8 get_rng_vid(void)
{
ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
u32 cha_vid = sec_in32(&sec->chavid_ls);
return (cha_vid & SEC_CHAVID_RNG_LS_MASK) >> SEC_CHAVID_LS_RNG_SHIFT;
}
/*
* By default, the TRNG runs for 200 clocks per sample;
* 1200 clocks per sample generates better entropy.
*/
static void kick_trng(int ent_delay)
{
ccsr_sec_t __iomem *sec =
(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
struct rng4tst __iomem *rng =
(struct rng4tst __iomem *)&sec->rng;
u32 val;
/* put RNG4 into program mode */
sec_setbits32(&rng->rtmctl, RTMCTL_PRGM);
/* rtsdctl bits 0-15 contain "Entropy Delay, which defines the
* length (in system clocks) of each Entropy sample taken
* */
val = sec_in32(&rng->rtsdctl);
val = (val & ~RTSDCTL_ENT_DLY_MASK) |
(ent_delay << RTSDCTL_ENT_DLY_SHIFT);
sec_out32(&rng->rtsdctl, val);
/* min. freq. count, equal to 1/4 of the entropy sample length */
sec_out32(&rng->rtfreqmin, ent_delay >> 2);
/* max. freq. count, equal to 8 times the entropy sample length */
sec_out32(&rng->rtfreqmax, ent_delay << 3);
/* put RNG4 into run mode */
sec_clrbits32(&rng->rtmctl, RTMCTL_PRGM);
}
static int rng_init(void)
{
int ret, ent_delay = RTSDCTL_ENT_DLY_MIN;
ccsr_sec_t __iomem *sec =
(ccsr_sec_t __iomem *)CONFIG_SYS_FSL_SEC_ADDR;
struct rng4tst __iomem *rng =
(struct rng4tst __iomem *)&sec->rng;
u32 rdsta = sec_in32(&rng->rdsta);
/* Check if RNG state 0 handler is already instantiated */
if (rdsta & RNG_STATE0_HANDLE_INSTANTIATED)
return 0;
do {
/*
* If either of the SH's were instantiated by somebody else
* then it is assumed that the entropy
* parameters are properly set and thus the function
* setting these (kick_trng(...)) is skipped.
* Also, if a handle was instantiated, do not change
* the TRNG parameters.
*/
kick_trng(ent_delay);
ent_delay += 400;
/*
* if instantiate_rng(...) fails, the loop will rerun
* and the kick_trng(...) function will modfiy the
* upper and lower limits of the entropy sampling
* interval, leading to a sucessful initialization of
* the RNG.
*/
ret = instantiate_rng();
} while ((ret == -1) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
if (ret) {
printf("RNG: Failed to instantiate RNG\n");
return ret;
}
/* Enable RDB bit so that RNG works faster */
sec_setbits32(&sec->scfgr, SEC_SCFGR_RDBENABLE);
return ret;
}
int sec_init(void)
{
int ret = 0;
#ifdef CONFIG_PHYS_64BIT
ccsr_sec_t *sec = (void *)CONFIG_SYS_FSL_SEC_ADDR;
uint32_t mcr = sec_in32(&sec->mcfgr);
sec_out32(&sec->mcfgr, mcr | 1 << MCFGR_PS_SHIFT);
#endif
ret = jr_init();
if (ret < 0) {
printf("SEC initialization failed\n");
return -1;
}
if (get_rng_vid() >= 4) {
if (rng_init() < 0) {
printf("RNG instantiation failed\n");
return -1;
}
printf("SEC: RNG instantiated\n");
}
return ret;
}