From patchwork Wed Feb 19 12:39:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 11391323 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B4E26138D for ; Wed, 19 Feb 2020 12:39:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9FBC72467D for ; Wed, 19 Feb 2020 12:39:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727614AbgBSMjp (ORCPT ); Wed, 19 Feb 2020 07:39:45 -0500 Received: from mx2.suse.de ([195.135.220.15]:52840 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727274AbgBSMjp (ORCPT ); Wed, 19 Feb 2020 07:39:45 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 6ED95B4D0; Wed, 19 Feb 2020 12:39:43 +0000 (UTC) From: Nicolas Saenz Julienne To: linux-kernel@vger.kernel.org, Nicolas Saenz Julienne , Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com Cc: linux-usb@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, tim.gover@raspberrypi.org, linux-pci@vger.kernel.org, wahrenst@gmx.net Subject: [PATCH v2 2/4] firmware: raspberrypi: Introduce vl805 init routine Date: Wed, 19 Feb 2020 13:39:31 +0100 Message-Id: <20200219123933.2792-3-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200219123933.2792-1-nsaenzjulienne@suse.de> References: <20200219123933.2792-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On the Raspberry Pi 4, after a PCI reset, VL805's firmware may either be loaded directly from an EEPROM or, if not present, by the SoC's VideCore. The function informs VideCore that VL805 was just reset, or requests for a probe defer. Based on Tim Gover's downstream implementation. Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Florian Fainelli --- Changes since v1: - Moved into own commit and firmware/raspberrypi.c drivers/firmware/raspberrypi.c | 37 ++++++++++++++++++++++ include/soc/bcm2835/raspberrypi-firmware.h | 7 ++++ 2 files changed, 44 insertions(+) diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c index da26a584dca0..cc0563029805 100644 --- a/drivers/firmware/raspberrypi.c +++ b/drivers/firmware/raspberrypi.c @@ -286,6 +286,43 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) } EXPORT_SYMBOL_GPL(rpi_firmware_get); +/* + * On the Raspberry Pi 4, after a PCI reset, VL805's firmware may either be + * loaded directly from an EEPROM or, if not present, by the SoC's VideCore. + * Inform VideCore that VL805 was just reset, or defer xhci's probe if not yet + * joinable trough the mailbox interface. + */ +int rpi_firmware_init_vl805(struct pci_dev *pdev) +{ + struct device_node *fw_np; + struct rpi_firmware *fw; + u32 dev_addr; + int ret; + + fw_np = of_find_compatible_node(NULL, NULL, + "raspberrypi,bcm2835-firmware"); + if (!fw_np) + return 0; + + fw = rpi_firmware_get(fw_np); + of_node_put(fw_np); + if (!fw) + return -EPROBE_DEFER; + + dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 | + PCI_FUNC(pdev->devfn) << 12; + + ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET, + &dev_addr, sizeof(dev_addr)); + if (ret) + return ret; + + dev_dbg(&pdev->dev, "loaded Raspberry Pi's VL805 firmware\n"); + + return 0; +} +EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805); + static const struct of_device_id rpi_firmware_of_match[] = { { .compatible = "raspberrypi,bcm2835-firmware", }, {}, diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h index cc9cdbc66403..a37c3a461d2a 100644 --- a/include/soc/bcm2835/raspberrypi-firmware.h +++ b/include/soc/bcm2835/raspberrypi-firmware.h @@ -8,6 +8,7 @@ #include #include +#include struct rpi_firmware; @@ -141,6 +142,7 @@ int rpi_firmware_property(struct rpi_firmware *fw, int rpi_firmware_property_list(struct rpi_firmware *fw, void *data, size_t tag_size); struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node); +int rpi_firmware_init_vl805(struct pci_dev *pdev); #else static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *data, size_t len) @@ -158,6 +160,11 @@ static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware { return NULL; } + +static int rpi_firmware_init_vl805(struct pci_dev *pdev) +{ + return 0; +} #endif #endif /* __SOC_RASPBERRY_FIRMWARE_H__ */