wifi: brcmfmac: Handle watchdog properly in newer cores

On newer cores, we need to explicitly set the subsystems to reset via
the watchdog. Logic adapted from bcmdhd.

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

@@ -736,8 +736,30 @@ static void brcmf_pcie_reset_device(struct brcmf_pciedev_info *devinfo)
 
 	/* Watchdog reset */
 	brcmf_pcie_select_core(devinfo, BCMA_CORE_CHIPCOMMON);
-	WRITECC32(devinfo, watchdog, 4);
-	msleep(100);
+	core = brcmf_chip_get_chipcommon(devinfo->ci);
+
+	if (core->rev >= 65) {
+		u32 mask = CC_WD_SSRESET_PCIE_F0_EN;
+
+		core = brcmf_chip_get_core(devinfo->ci, BCMA_CORE_PCIE2);
+		if (core->rev < 66)
+			mask |= CC_WD_SSRESET_PCIE_ALL_FN_EN;
+
+		val = READCC32(devinfo, watchdog);
+		val &= ~CC_WD_ENABLE_MASK;
+		val |= mask;
+		WRITECC32(devinfo, watchdog, val);
+		val &= ~CC_WD_COUNTER_MASK;
+		val |= 4;
+		WRITECC32(devinfo, watchdog, val);
+		msleep(10);
+		val = READCC32(devinfo, intstatus);
+		val |= mask;
+		WRITECC32(devinfo, intstatus, val);
+	} else {
+		WRITECC32(devinfo, watchdog, 4);
+		msleep(100);
+	}
 
 	/* Restore ASPM */
 	brcmf_pcie_select_core(devinfo, BCMA_CORE_PCIE2);

drivers/net/wireless/broadcom/brcm80211/include/chipcommon.h

@@ -302,6 +302,14 @@ struct chipcregs {
 #define PMU_RCTL_LOGIC_DISABLE_MASK         (1 << 27)
 
 
+/* watchdog */
+#define CC_WD_SSRESET_PCIE_F0_EN	0x10000000
+#define CC_WD_SSRESET_PCIE_F1_EN	0x20000000
+#define CC_WD_SSRESET_PCIE_F2_EN	0x40000000
+#define CC_WD_SSRESET_PCIE_ALL_FN_EN	0x80000000
+#define CC_WD_COUNTER_MASK		0x0fffffff
+#define CC_WD_ENABLE_MASK		0xf0000000
+
 /*
 * Maximum delay for the PMU state transition in us.
 * This is an upper bound intended for spinwaits etc.