[PATCH 4.15 078/105] can: ifi: Check core revision upon probe

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Vasut <marex@xxxxxxx>

commit 591d65d5b15496af8d05e252bc1da611c66c0b79 upstream.

Older versions of the core are not compatible with the driver due
to various intrusive fixes of the core. Read out the VER register,
check the core revision bitfield and verify if the core in use is
new enough (rev 2.1 or newer) to work correctly with this driver.

Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Heiko Schocher <hs@xxxxxxx>
Cc: Markus Marb <markus@xxxxxxxx>
Cc: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/can/ifi_canfd/ifi_canfd.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -144,6 +144,8 @@
 #define IFI_CANFD_SYSCLOCK			0x50
 
 #define IFI_CANFD_VER				0x54
+#define IFI_CANFD_VER_REV_MASK			0xff
+#define IFI_CANFD_VER_REV_MIN_SUPPORTED		0x15
 
 #define IFI_CANFD_IP_ID				0x58
 #define IFI_CANFD_IP_ID_VALUE			0xD073CAFD
@@ -943,7 +945,7 @@ static int ifi_canfd_plat_probe(struct p
 	struct resource *res;
 	void __iomem *addr;
 	int irq, ret;
-	u32 id;
+	u32 id, rev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	addr = devm_ioremap_resource(dev, res);
@@ -957,6 +959,13 @@ static int ifi_canfd_plat_probe(struct p
 		return -EINVAL;
 	}
 
+	rev = readl(addr + IFI_CANFD_VER) & IFI_CANFD_VER_REV_MASK;
+	if (rev < IFI_CANFD_VER_REV_MIN_SUPPORTED) {
+		dev_err(dev, "This block is too old (rev %i), minimum supported is rev %i\n",
+			rev, IFI_CANFD_VER_REV_MIN_SUPPORTED);
+		return -EINVAL;
+	}
+
 	ndev = alloc_candev(sizeof(*priv), 1);
 	if (!ndev)
 		return -ENOMEM;