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Subject[PATCH] drivers: crypto: caam: jr: Allow quiesce when quiesced
Date
From: Horia Geanta <horia.geanta@nxp.com>

Issues:
- Job ring device is busy when do kexec reboot
- Failed to flush job ring when do system suspend-resume

Fix:
Flush the job ring to stop the running jobs.

Signed-off-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>
---
drivers/crypto/caam/jr.c | 53 +++++++++++++++++++++++++++++++++-------
1 file changed, 44 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 724fdec18bf9..8745fe3cb575 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -72,19 +72,27 @@ static void caam_jr_crypto_engine_exit(void *data)
crypto_engine_exit(jrpriv->engine);
}

-static int caam_reset_hw_jr(struct device *dev)
+/*
+ * Put the CAAM in quiesce, ie stop
+ *
+ * Must be called with itr disabled
+ */
+static int caam_jr_stop_processing(struct device *dev, u32 jrcr_bits)
{
struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
unsigned int timeout = 100000;

- /*
- * mask interrupts since we are going to poll
- * for reset completion status
- */
- clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
+ /* Check the current status */
+ if (rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_INPROGRESS)
+ goto wait_quiesce_completion;

- /* initiate flush (required prior to reset) */
- wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
+ /* Reset the field */
+ clrsetbits_32(&jrp->rregs->jrintstatus, JRINT_ERR_HALT_MASK, 0);
+
+ /* initiate flush / park (required prior to reset) */
+ wr_reg32(&jrp->rregs->jrcommand, jrcr_bits);
+
+wait_quiesce_completion:
while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) ==
JRINT_ERR_HALT_INPROGRESS) && --timeout)
cpu_relax();
@@ -95,8 +103,35 @@ static int caam_reset_hw_jr(struct device *dev)
return -EIO;
}

+ return 0;
+}
+
+/*
+ * Flush the job ring, so the jobs running will be stopped, jobs queued will be
+ * invalidated and the CAAM will no longer fetch fron input ring.
+ *
+ * Must be called with itr disabled
+ */
+static int caam_jr_flush(struct device *dev)
+{
+ return caam_jr_stop_processing(dev, JRCR_RESET);
+}
+
+static int caam_reset_hw_jr(struct device *dev)
+{
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
+ unsigned int timeout = 100000;
+ int err;
+ /*
+ * mask interrupts since we are going to poll
+ * for reset completion status
+ */
+ clrsetbits_32(&jrp->rregs->rconfig_lo, 0, JRCFG_IMSK);
+ err = caam_jr_flush(dev);
+ if (err)
+ return err;
+
/* initiate reset */
- timeout = 100000;
wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET);
while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout)
cpu_relax();
--
2.25.1
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