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Subject[RFC] crypto: caam: re-init JR on resume
Date
The JR loses its configuration during suspend-to-RAM (at least on
i.MX6UL). Re-initialize the hardware on resume.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
---

I've come across the issue that the CAAM would not work anymore after
deep sleep on i.MX6UL. It turned out that the CAAM loses its state
during suspend-to-RAM, so all registers read as zero and need to be
reinitialized.

This patch is my first attempt at fixing the issue. It seems to work
well enough, but I assume I'm missing some synchronization to prevent
that some CAAM operation is currently under way when the suspend
happens? I don't know the PM and crypto subsystems well enough to judge
if this is possible, and if it is, how to prevent it.

I've only compile-tested this version of the patch, as I had to port it
from our board kernel, which is based on the heavily-modified NXP branch.


drivers/crypto/caam/intern.h | 3 ++
drivers/crypto/caam/jr.c | 62 +++++++++++++++++++++++++-----------
2 files changed, 46 insertions(+), 19 deletions(-)

diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h
index c7c10c90464b..5d2e9091d5c2 100644
--- a/drivers/crypto/caam/intern.h
+++ b/drivers/crypto/caam/intern.h
@@ -47,6 +47,9 @@ struct caam_drv_private_jr {
struct tasklet_struct irqtask;
int irq; /* One per queue */

+ dma_addr_t inpbusaddr;
+ dma_addr_t outbusaddr;
+
/* Number of scatterlist crypt transforms active on the JobR */
atomic_t tfm_count ____cacheline_aligned;

diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index fc97cde27059..2dabf5fd7818 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -418,13 +418,31 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
}
EXPORT_SYMBOL(caam_jr_enqueue);

+static void caam_jr_setup_rings(struct caam_drv_private_jr *jrp)
+{
+ jrp->out_ring_read_index = 0;
+ jrp->head = 0;
+ jrp->tail = 0;
+
+ wr_reg64(&jrp->rregs->inpring_base, jrp->inpbusaddr);
+ wr_reg64(&jrp->rregs->outring_base, jrp->outbusaddr);
+ wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
+ wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
+
+ jrp->inpring_avail = JOBR_DEPTH;
+
+ /* Select interrupt coalescing parameters */
+ clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JOBR_INTC |
+ (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
+ (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
+}
+
/*
* Init JobR independent of platform property detection
*/
static int caam_jr_init(struct device *dev)
{
struct caam_drv_private_jr *jrp;
- dma_addr_t inpbusaddr, outbusaddr;
int i, error;

jrp = dev_get_drvdata(dev);
@@ -434,13 +452,13 @@ static int caam_jr_init(struct device *dev)
return error;

jrp->inpring = dmam_alloc_coherent(dev, SIZEOF_JR_INPENTRY *
- JOBR_DEPTH, &inpbusaddr,
+ JOBR_DEPTH, &jrp->inpbusaddr,
GFP_KERNEL);
if (!jrp->inpring)
return -ENOMEM;

jrp->outring = dmam_alloc_coherent(dev, SIZEOF_JR_OUTENTRY *
- JOBR_DEPTH, &outbusaddr,
+ JOBR_DEPTH, &jrp->outbusaddr,
GFP_KERNEL);
if (!jrp->outring)
return -ENOMEM;
@@ -453,24 +471,9 @@ static int caam_jr_init(struct device *dev)
for (i = 0; i < JOBR_DEPTH; i++)
jrp->entinfo[i].desc_addr_dma = !0;

- /* Setup rings */
- jrp->out_ring_read_index = 0;
- jrp->head = 0;
- jrp->tail = 0;
-
- wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
- wr_reg64(&jrp->rregs->outring_base, outbusaddr);
- wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
- wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
-
- jrp->inpring_avail = JOBR_DEPTH;
-
spin_lock_init(&jrp->inplock);

- /* Select interrupt coalescing parameters */
- clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JOBR_INTC |
- (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
- (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
+ caam_jr_setup_rings(jrp);

tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);

@@ -486,6 +489,20 @@ static int caam_jr_init(struct device *dev)
return error;
}

+static int caam_jr_reinit(struct device *dev)
+{
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+ int error;
+
+ error = caam_reset_hw_jr(dev);
+ if (error)
+ return error;
+
+ caam_jr_setup_rings(jrp);
+
+ return 0;
+}
+
static void caam_jr_irq_dispose_mapping(void *data)
{
irq_dispose_mapping((unsigned long)data);
@@ -578,10 +595,17 @@ static const struct of_device_id caam_jr_match[] = {
};
MODULE_DEVICE_TABLE(of, caam_jr_match);

+#ifdef CONFIG_PM
+static SIMPLE_DEV_PM_OPS(caam_jr_pm_ops, caam_reset_hw_jr, caam_jr_reinit);
+#endif
+
static struct platform_driver caam_jr_driver = {
.driver = {
.name = "caam_jr",
.of_match_table = caam_jr_match,
+#ifdef CONFIG_PM
+ .pm = &caam_jr_pm_ops,
+#endif
},
.probe = caam_jr_probe,
.remove = caam_jr_remove,
--
2.17.1
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