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Subject[PATCH 11/14] crypto: inside-secure - reset CDR and RDR rings on module removal
Date
From: Ofer Heifetz <oferh@marvell.com>

This patch adds extra steps in the module removal path, to reset the
command and result rings. The corresponding interrupts are cleared, and
the ring address configuration is reset.

Signed-off-by: Ofer Heifetz <oferh@marvell.com>
[Antoine: small reworks, commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
drivers/crypto/inside-secure/safexcel.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c
index b70694090353..5feb83c6238b 100644
--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -1125,6 +1125,24 @@ static int safexcel_probe(struct platform_device *pdev)
return ret;
}

+static void safexcel_hw_reset_rings(struct safexcel_crypto_priv *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->config.rings; i++) {
+ /* clear any pending interrupt */
+ writel(GENMASK(5, 0), EIP197_HIA_CDR(priv, i) + EIP197_HIA_xDR_STAT);
+ writel(GENMASK(7, 0), EIP197_HIA_RDR(priv, i) + EIP197_HIA_xDR_STAT);
+
+ /* Reset the CDR base address */
+ writel(0, EIP197_HIA_CDR(priv, i) + EIP197_HIA_xDR_RING_BASE_ADDR_LO);
+ writel(0, EIP197_HIA_CDR(priv, i) + EIP197_HIA_xDR_RING_BASE_ADDR_HI);
+
+ /* Reset the RDR base address */
+ writel(0, EIP197_HIA_RDR(priv, i) + EIP197_HIA_xDR_RING_BASE_ADDR_LO);
+ writel(0, EIP197_HIA_RDR(priv, i) + EIP197_HIA_xDR_RING_BASE_ADDR_HI);
+ }
+}

static int safexcel_remove(struct platform_device *pdev)
{
@@ -1132,6 +1150,8 @@ static int safexcel_remove(struct platform_device *pdev)
int i;

safexcel_unregister_algorithms(priv);
+ safexcel_hw_reset_rings(priv);
+
clk_disable_unprepare(priv->clk);

for (i = 0; i < priv->config.rings; i++)
--
2.17.1
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