crypto: caam - ERA retrieval and printing for SEC device

This patch adds support for retrieving and printing of
SEC ERA information. It is useful for knowing beforehand
what features exist from the SEC point of view on a
certain SoC. Only era-s 1 to 4 are currently supported;
other eras will appear as unknown.

Signed-off-by: Alex Porosanu <alexandru.porosanu@freescale.com>

- rebased onto current cryptodev master
- made caam_eras static

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 39 insertions, 2 deletions

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index ac6abb3..414ba20 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -11,6 +11,7 @@
 #include "jr.h"
 #include "desc_constr.h"
 #include "error.h"
+#include "ctrl.h"
 
 static int caam_remove(struct platform_device *pdev)
 {
@@ -155,10 +156,44 @@ static void kick_trng(struct platform_device *pdev)
 	clrbits32(&r4tst->rtmctl, RTMCTL_PRGM);
 }
 
+/**
+ * caam_get_era() - Return the ERA of the SEC on SoC, based
+ * on the SEC_VID register.
+ * Returns the ERA number (1..4) or -ENOTSUPP if the ERA is unknown.
+ * @caam_id - the value of the SEC_VID register
+ **/
+int caam_get_era(u64 caam_id)
+{
+	struct sec_vid *sec_vid = (struct sec_vid *)&caam_id;
+	static const struct {
+		u16 ip_id;
+		u8 maj_rev;
+		u8 era;
+	} caam_eras[] = {
+		{0x0A10, 1, 1},
+		{0x0A10, 2, 2},
+		{0x0A12, 1, 3},
+		{0x0A14, 1, 3},
+		{0x0A14, 2, 4},
+		{0x0A16, 1, 4},
+		{0x0A11, 1, 4}
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(caam_eras); i++)
+		if (caam_eras[i].ip_id == sec_vid->ip_id &&
+			caam_eras[i].maj_rev == sec_vid->maj_rev)
+				return caam_eras[i].era;
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL(caam_get_era);
+
 /* Probe routine for CAAM top (controller) level */
 static int caam_probe(struct platform_device *pdev)
 {
 	int ret, ring, rspec;
+	u64 caam_id;
 	struct device *dev;
 	struct device_node *nprop, *np;
 	struct caam_ctrl __iomem *ctrl;
@@ -276,9 +311,11 @@ static int caam_probe(struct platform_device *pdev)
 	/* Initialize queue allocator lock */
 	spin_lock_init(&ctrlpriv->jr_alloc_lock);
 
+	caam_id = rd_reg64(&topregs->ctrl.perfmon.caam_id);
+
 	/* Report "alive" for developer to see */
-	dev_info(dev, "device ID = 0x%016llx\n",
-		 rd_reg64(&topregs->ctrl.perfmon.caam_id));
+	dev_info(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
+		 caam_get_era(caam_id));
 	dev_info(dev, "job rings = %d, qi = %d\n",
 		 ctrlpriv->total_jobrs, ctrlpriv->qi_present);