[PATCH 18/18] crypto: caam - allow retrieving 'era' from register

[Marcin Niestroj <m.niestroj@grinn-global.com>]

Pick commit 654f2b937b389295581bcb4aa26011a63db7bc8f from Linux
upstream.

    crypto: caam - allow retrieving 'era' from register

    The 'era' information can be retrieved from CAAM registers, so
    introduce a caam_get_era_from_hw() function that gets it via register
    reads in case the 'fsl,sec-era' property is not passed in the device
    tree.

    This function is based on the U-Boot implementation from
    drivers/crypto/fsl/sec.c

    Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
    Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
    Tested-by: Breno Lima <breno.lima@nxp.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
---
 drivers/crypto/caam/ctrl.c | 56 +++++++++++++++++++++++++++++++++++---
 drivers/crypto/caam/regs.h |  6 ++++
 2 files changed, 58 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 3b24c5ea2..9e62bd6fd 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -282,11 +282,56 @@ start_rng:
 	clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM, RTMCTL_SAMP_MODE_RAW_ES_SC);
 }
 
+static int caam_get_era_from_hw(struct caam_ctrl __iomem *ctrl)
+{
+	static const struct {
+		u16 ip_id;
+		u8 maj_rev;
+		u8 era;
+	} id[] = {
+		{0x0A10, 1, 1},
+		{0x0A10, 2, 2},
+		{0x0A12, 1, 3},
+		{0x0A14, 1, 3},
+		{0x0A14, 2, 4},
+		{0x0A16, 1, 4},
+		{0x0A10, 3, 4},
+		{0x0A11, 1, 4},
+		{0x0A18, 1, 4},
+		{0x0A11, 2, 5},
+		{0x0A12, 2, 5},
+		{0x0A13, 1, 5},
+		{0x0A1C, 1, 5}
+	};
+	u32 ccbvid, id_ms;
+	u8 maj_rev, era;
+	u16 ip_id;
+	int i;
+
+	ccbvid = rd_reg32(&ctrl->perfmon.ccb_id);
+	era = (ccbvid & CCBVID_ERA_MASK) >> CCBVID_ERA_SHIFT;
+	if (era)	/* This is '0' prior to CAAM ERA-6 */
+		return era;
+
+	id_ms = rd_reg32(&ctrl->perfmon.caam_id_ms);
+	ip_id = (id_ms & SECVID_MS_IPID_MASK) >> SECVID_MS_IPID_SHIFT;
+	maj_rev = (id_ms & SECVID_MS_MAJ_REV_MASK) >> SECVID_MS_MAJ_REV_SHIFT;
+
+	for (i = 0; i < ARRAY_SIZE(id); i++)
+		if (id[i].ip_id == ip_id && id[i].maj_rev == maj_rev)
+			return id[i].era;
+
+	return -ENOTSUPP;
+}
+
 /**
  * caam_get_era() - Return the ERA of the SEC on SoC, based
- * on "sec-era" propery in the DTS. This property is updated by u-boot.
+ * on "sec-era" optional property in the DTS. This property is updated
+ * by u-boot.
+ * In case this property is not passed an attempt to retrieve the CAAM
+ * era via register reads will be made.
  **/
-static int caam_get_era(void)
+static int caam_get_era(struct caam_ctrl __iomem *ctrl)
 {
 	struct device_node *caam_node;
 	int ret;
@@ -295,7 +340,10 @@ static int caam_get_era(void)
 	caam_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
 	ret = of_property_read_u32(caam_node, "fsl,sec-era", &prop);
 
-	return IS_ERR_VALUE(ret) ? -ENOTSUPP : prop;
+	if (!ret)
+		return prop;
+	else
+		return caam_get_era_from_hw(ctrl);
 }
 
 /* Probe routine for CAAM top (controller) level */
@@ -593,7 +641,7 @@ static int caam_probe(struct device_d *dev)
 
 	/* Report "alive" for developer to see */
 	dev_dbg(dev, "device ID = 0x%016llx (Era %d)\n", caam_id,
-		 caam_get_era());
+		 caam_get_era(ctrl));
 	dev_dbg(dev, "job rings = %d, qi = %d\n",
 		 ctrlpriv->total_jobrs, ctrlpriv->qi_present);
 
diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
index d50e9ad69..6c9d6d75a 100644
--- a/drivers/crypto/caam/regs.h
+++ b/drivers/crypto/caam/regs.h
@@ -307,11 +307,17 @@ struct caam_perfmon {
 
 	/* Component Instantiation Parameters			fe0-fff */
 	u32 rtic_id;		/* RVID - RTIC Version ID	*/
+#define CCBVID_ERA_MASK		0xff000000
+#define CCBVID_ERA_SHIFT	24
 	u32 ccb_id;		/* CCBVID - CCB Version ID	*/
 	u32 cha_id_ms;		/* CHAVID - CHA Version ID Most Significant*/
 	u32 cha_id_ls;		/* CHAVID - CHA Version ID Least Significant*/
 	u32 cha_num_ms;		/* CHANUM - CHA Number Most Significant	*/
 	u32 cha_num_ls;		/* CHANUM - CHA Number Least Significant*/
+#define SECVID_MS_IPID_MASK	0xffff0000
+#define SECVID_MS_IPID_SHIFT	16
+#define SECVID_MS_MAJ_REV_MASK	0x0000ff00
+#define SECVID_MS_MAJ_REV_SHIFT	8
 	u32 caam_id_ms;		/* CAAMVID - CAAM Version ID MS	*/
 	u32 caam_id_ls;		/* CAAMVID - CAAM Version ID LS	*/
 };
-- 
2.18.0


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