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can: ifi: Check core revision upon probe 

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@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Markus Marb <markus@marb.org>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marek Vasut 2018-03-05 21:29:52 +01:00 committed by Marc Kleine-Budde
parent b7db978ac2
commit 591d65d5b1
1 changed files with 10 additions and 1 deletions
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11
drivers/net/can/ifi_canfd/ifi_canfd.c
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@ -136,6 +136,8 @@
#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
@ -933,7 +935,7 @@ static int ifi_canfd_plat_probe(struct platform_device *pdev)
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);
@ -947,6 +949,13 @@ static int ifi_canfd_plat_probe(struct platform_device *pdev)
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;