From patchwork Mon Dec 20 14:44:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 12688029 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C4A6DC43219 for ; Mon, 20 Dec 2021 14:43:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LvBRq5fQHKTRW8kkPHMAMzQ+0nS1lNzO3JybFL3El7w=; b=2cIlvK5sC5nqN2 PVr3O8tciKU0ivhuBN3Jn6Etxv84LxhlP0iXexwMVXxcSLzaHGGEfMDFYiPF79BmuvM5Smt79+hbj pEXF0fDpL5LhT88iwaWbgqhIJv4dH2FIyX/BJsQlG/yrcstFEBd6dGnRrBj8o1CrAx8vYd1TKoz++ UiJgNqJ4xxC3io1FRAcaD9kL7xo7KZ1wGRFDQmPpk4N/63xyUxsnCVhFDoUgsbAbH1Ycabc7dsVVv iNqbEfd/YxgS1P9f7l1CVIfL6ZabBDZADO6nTXvX5jUM2MyL0N0pqR7NTsiTM4x1Zhr0i+AX7qVU8 n+J3l4BoOoWp4JNF/GCw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mzJsw-002sST-CY; Mon, 20 Dec 2021 14:43:30 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mzJsr-002sP1-E3; Mon, 20 Dec 2021 14:43:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1640011405; x=1671547405; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=w73IfcBHI2FV4/yj8pvcDvBzB/pwQuj46iB9BZRbAfU=; b=mZ1gszQsj99R+uxRD0LZ9WBQOAdjNYpbSLxr37XCQJcWQyVlAa7VmOGv Z8NEeiKRCiqSqK5al9GoHuat/vSdIHRS6NSlBCpK+5snLCN09WNlHIO0+ GuyosjRurz0oe0dPWUGRrSNy8xPABl7Thvb+YgjI27TbtpXIZktoQ55Yh oc1aEAGMjwBuEPXZktVMU+0uXfq3xXZyoLs11TWryajM6yMO+SMM7gt7J 5EKUbG7exGnOLIoOyV/G6G5KsvIz3sZxx76PZcP+RcIoO4q2WuX6l+lVz UUxR6Eq+Wu1HfpeEoKoqsGf3TmudwUngwH9Oj9XBiQMt+JuTAnolNpSUb Q==; IronPort-SDR: RRNooySPvRBqeBZlkYAHAcqyzpvTIUoUd+2AycdG/rXaU4laCr2uqKgkZbJz1MIoC+pP2wcwpe c6Qic6QtZQZOA6dpMSJZvfMM6Z0C6UA0wJPlM2SQOOzLTiNdN+s2knI/rC3g3AYIJqeGIQmZqa YBJyEZLkN6GkV6znjyiXcDQn+SbqKIwWPRQe0IE2df0MxkZ66Z00Dh1U3yeo0TphiMGCrm0BS9 DGdUBYKelYOEQ1zcV6ZCd/iT/sKahE4dgIVTG7J4MIC8s5pRj9ySb8Q5kRAY6new3IwXlynQTX 2KqmhGc70mYf8TjZ0gDLpTEW X-IronPort-AV: E=Sophos;i="5.88,220,1635231600"; d="scan'208";a="156110002" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 20 Dec 2021 07:42:28 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Mon, 20 Dec 2021 07:42:27 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Mon, 20 Dec 2021 07:42:24 -0700 From: To: , , , , , CC: , , , , , , , , , , , , , , Conor Dooley Subject: [PATCH v2 1/1] soc: add polarfire soc system controller Date: Mon, 20 Dec 2021 14:44:13 +0000 Message-ID: <20211220144413.6798-2-conor.dooley@microchip.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211220144413.6798-1-conor.dooley@microchip.com> References: <20211220144413.6798-1-conor.dooley@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211220_064325_554942_AB40D0EA X-CRM114-Status: GOOD ( 22.31 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Conor Dooley This driver provides an interface for other drivers to access the functions of the system controller on the Microchip PolarFire SoC. Signed-off-by: Conor Dooley --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/microchip/Kconfig | 10 ++ drivers/soc/microchip/Makefile | 1 + drivers/soc/microchip/mpfs-sys-controller.c | 169 ++++++++++++++++++++ include/soc/microchip/mpfs.h | 3 +- 6 files changed, 184 insertions(+), 1 deletion(-) create mode 100644 drivers/soc/microchip/Kconfig create mode 100644 drivers/soc/microchip/Makefile create mode 100644 drivers/soc/microchip/mpfs-sys-controller.c diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index e8a30c4c5aec..b33142e020e0 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -12,6 +12,7 @@ source "drivers/soc/imx/Kconfig" source "drivers/soc/ixp4xx/Kconfig" source "drivers/soc/litex/Kconfig" source "drivers/soc/mediatek/Kconfig" +source "drivers/soc/microchip/Kconfig" source "drivers/soc/qcom/Kconfig" source "drivers/soc/renesas/Kconfig" source "drivers/soc/rockchip/Kconfig" diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index a05e9fbcd3e0..e3be151e391e 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -17,6 +17,7 @@ obj-y += ixp4xx/ obj-$(CONFIG_SOC_XWAY) += lantiq/ obj-$(CONFIG_LITEX_SOC_CONTROLLER) += litex/ obj-y += mediatek/ +obj-y += microchip/ obj-y += amlogic/ obj-y += qcom/ obj-y += renesas/ diff --git a/drivers/soc/microchip/Kconfig b/drivers/soc/microchip/Kconfig new file mode 100644 index 000000000000..eb656b33156b --- /dev/null +++ b/drivers/soc/microchip/Kconfig @@ -0,0 +1,10 @@ +config POLARFIRE_SOC_SYS_CTRL + tristate "POLARFIRE_SOC_SYS_CTRL" + depends on POLARFIRE_SOC_MAILBOX + help + This driver adds support for the PolarFire SoC (MPFS) system controller. + + To compile this driver as a module, choose M here. the + module will be called mpfs_system_controller. + + If unsure, say N. diff --git a/drivers/soc/microchip/Makefile b/drivers/soc/microchip/Makefile new file mode 100644 index 000000000000..14489919fe4b --- /dev/null +++ b/drivers/soc/microchip/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_POLARFIRE_SOC_SYS_CTRL) += mpfs-sys-controller.o diff --git a/drivers/soc/microchip/mpfs-sys-controller.c b/drivers/soc/microchip/mpfs-sys-controller.c new file mode 100644 index 000000000000..af3b05d8b41e --- /dev/null +++ b/drivers/soc/microchip/mpfs-sys-controller.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Microchip PolarFire SoC (MPFS) system controller driver + * + * Copyright (c) 2020-2021 Microchip Corporation. All rights reserved. + * + * Author: Conor Dooley + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(transaction_lock); + +struct mpfs_sys_controller { + struct mbox_client client; + struct mbox_chan *chan; + struct completion c; + struct kref consumers; +}; + +int mpfs_blocking_transaction(struct mpfs_sys_controller *sys_controller, void *msg) +{ + int ret, err; + + err = mutex_lock_interruptible(&transaction_lock); + if (err) + return err; + + reinit_completion(&sys_controller->c); + + ret = mbox_send_message(sys_controller->chan, msg); + if (ret >= 0) { + if (wait_for_completion_timeout(&sys_controller->c, HZ)) { + ret = 0; + } else { + ret = -ETIMEDOUT; + dev_warn(sys_controller->client.dev, + "MPFS sys controller transaction timeout\n"); + } + } else { + dev_err(sys_controller->client.dev, + "mpfs sys controller transaction returned %d\n", ret); + } + + mutex_unlock(&transaction_lock); + + return ret; +} +EXPORT_SYMBOL(mpfs_blocking_transaction); + +static void rx_callback(struct mbox_client *client, void *msg) +{ + struct mpfs_sys_controller *sys_controller = + container_of(client, struct mpfs_sys_controller, client); + + complete(&sys_controller->c); +} + +static void mpfs_sys_controller_delete(struct kref *kref) +{ + struct mpfs_sys_controller *sys_controller = container_of(kref, struct mpfs_sys_controller, + consumers); + + mbox_free_channel(sys_controller->chan); + kfree(sys_controller); +} + +void mpfs_sys_controller_put(void *data) +{ + struct mpfs_sys_controller *sys_controller = data; + + kref_put(&sys_controller->consumers, mpfs_sys_controller_delete); +} +EXPORT_SYMBOL_GPL(mpfs_sys_controller_put); + +static int mpfs_sys_controller_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mpfs_sys_controller *sys_controller; + + sys_controller = kzalloc(sizeof(*sys_controller), GFP_KERNEL); + if (!sys_controller) + return -ENOMEM; + + sys_controller->client.dev = dev; + sys_controller->client.rx_callback = rx_callback; + sys_controller->client.tx_block = 1U; + + sys_controller->chan = mbox_request_channel(&sys_controller->client, 0); + if (IS_ERR(sys_controller->chan)) + return dev_err_probe(dev, PTR_ERR(sys_controller->chan), + "Failed to get mbox channel\n"); + + init_completion(&sys_controller->c); + kref_init(&sys_controller->consumers); + + platform_set_drvdata(pdev, sys_controller); + + dev_info(&pdev->dev, "Registered MPFS system controller driver\n"); + + return 0; +} + +static int mpfs_sys_controller_remove(struct platform_device *pdev) +{ + struct mpfs_sys_controller *sys_controller = platform_get_drvdata(pdev); + + mpfs_sys_controller_put(sys_controller); + + return 0; +} + +struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev, + struct device_node *sys_ctrl_node) +{ + struct mpfs_sys_controller *sys_controller; + struct platform_device *pdev; + + pdev = of_find_device_by_node(sys_ctrl_node); + if (!pdev) + return NULL; + + sys_controller = platform_get_drvdata(pdev); + if (!sys_controller) + goto err_put_device; + + if (!kref_get_unless_zero(&sys_controller->consumers)) + goto err_put_device; + + put_device(&pdev->dev); + + if (devm_add_action_or_reset(dev, mpfs_sys_controller_put, sys_controller)) + return NULL; + + return sys_controller; + +err_put_device: + put_device(&pdev->dev); + return NULL; +} +EXPORT_SYMBOL_GPL(mpfs_sys_controller_get); + +static const struct of_device_id mpfs_sys_controller_of_match[] = { + {.compatible = "microchip,mpfs-sys-controller", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mpfs_sys_controller_of_match); + +static struct platform_driver mpfs_sys_controller_driver = { + .driver = { + .name = "mpfs-sys-controller", + .of_match_table = mpfs_sys_controller_of_match, + }, + .probe = mpfs_sys_controller_probe, + .remove = mpfs_sys_controller_remove, +}; +module_platform_driver(mpfs_sys_controller_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Conor Dooley "); +MODULE_DESCRIPTION("MPFS system controller driver"); diff --git a/include/soc/microchip/mpfs.h b/include/soc/microchip/mpfs.h index 2b64c95f3be5..0a594dfa8094 100644 --- a/include/soc/microchip/mpfs.h +++ b/include/soc/microchip/mpfs.h @@ -36,7 +36,8 @@ struct mpfs_mss_response { int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, void *msg); -struct mpfs_sys_controller *mpfs_sys_controller_get(struct device_node *mailbox_node); +struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev, + struct device_node *sys_ctrl_node); #endif /* if IS_ENABLED(CONFIG_POLARFIRE_SOC_SYS_CTRL) */