brcmfmac: trigger memory dump upon firmware halt signal

PCIe dongle firmware signals a halt/trap through mailbox interrupt.
Trigger a memory dump upon receiving such signal could help to provide
useful information for issue debug.

Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -182,6 +182,7 @@ static const struct brcmf_firmware_mapping brcmf_pcie_fwnames[] = {
 #define BRCMF_D2H_DEV_D3_ACK			0x00000001
 #define BRCMF_D2H_DEV_DS_ENTER_REQ		0x00000002
 #define BRCMF_D2H_DEV_DS_EXIT_NOTE		0x00000004
+#define BRCMF_D2H_DEV_FWHALT			0x10000000
 
 #define BRCMF_H2D_HOST_D3_INFORM		0x00000001
 #define BRCMF_H2D_HOST_DS_ACK			0x00000002
@@ -717,6 +718,10 @@ static void brcmf_pcie_handle_mb_data(struct brcmf_pciedev_info *devinfo)
 		devinfo->mbdata_completed = true;
 		wake_up(&devinfo->mbdata_resp_wait);
 	}
+	if (dtoh_mb_data & BRCMF_D2H_DEV_FWHALT) {
+		brcmf_dbg(PCIE, "D2H_MB_DATA: FW HALT\n");
+		brcmf_dev_coredump(&devinfo->pdev->dev);
+	}
 }