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authorHoria Geanta <horia.geanta@nxp.com>2023-02-28 21:37:58 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2023-03-14 12:06:45 +0300
commit06e39357c36b0d3cc2779d08ed04cb389eaa22ba (patch)
treefdc40dd132875dadc6dc598aea326b10fbce17dc /drivers/crypto
parentca25c00ccbc5f942c63897ed23584cfc66e8ec81 (diff)
downloadlinux-06e39357c36b0d3cc2779d08ed04cb389eaa22ba.tar.xz
drivers: crypto: caam/jr - Allow quiesce when quiesced
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> Reviewed-by: Pankaj Gupta <pankaj.gupta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/caam/jr.c55
1 files changed, 45 insertions, 10 deletions
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
index 724fdec18bf9..eb3b9a7e9a35 100644
--- a/drivers/crypto/caam/jr.c
+++ b/drivers/crypto/caam/jr.c
@@ -4,7 +4,7 @@
* JobR backend functionality
*
* Copyright 2008-2012 Freescale Semiconductor, Inc.
- * Copyright 2019 NXP
+ * Copyright 2019, 2023 NXP
*/
#include <linux/of_irq.h>
@@ -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();