From patchwork Tue Nov 23 14:06:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winiarska, Iwona" X-Patchwork-Id: 12693467 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 294DEC433F5 for ; Tue, 23 Nov 2021 14:13:00 +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=k9m3hQB+1uZwrpk70Xq5AI2WORn2CAwdgaB5M7xX19s=; b=5CbjKj0iGOYDPz wY7PUI5wRW3Usm9slUX8t+z1iGkJJjPjARKY/0+VlLjIGwoDW4BcnjkR2xPjuMoYgMZQVYIVw03CN hozXgwNgM6C6il/s78sG0xqs+axJ6Ne2/Iz8BMpEmpCQ7x29jStcGuFf3KWzdjtDhdWcmpnQ3PCs4 gr+FKPW2HkeiZbvDAua+jMRGLl+3T3wAT0t64eT9Ywb4DRBuH0UWBospSHHG/jJ5mVt2XidO+ZL6D 4BAw0abrK5gFIzrkt0/K3/ivjcUq3QnE9pdowNQzTjLvTm7CoK4BAiHSqsAlGlYPVcEcJtDbwE0p7 6Ly6z3AHLinjp4XO4bhw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mpWVo-002UY2-EH; Tue, 23 Nov 2021 14:11:10 +0000 Received: from mga03.intel.com ([134.134.136.65]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mpWUs-002U5e-3E for linux-arm-kernel@lists.infradead.org; Tue, 23 Nov 2021 14:10:12 +0000 X-IronPort-AV: E=McAfee;i="6200,9189,10176"; a="234974891" X-IronPort-AV: E=Sophos;i="5.87,257,1631602800"; d="scan'208";a="234974891" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2021 06:10:09 -0800 X-IronPort-AV: E=Sophos;i="5.87,257,1631602800"; d="scan'208";a="456704024" Received: from romanagn-mobl.ger.corp.intel.com (HELO localhost) ([10.249.144.24]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Nov 2021 06:09:57 -0800 From: Iwona Winiarska To: linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, Greg Kroah-Hartman Cc: devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, Rob Herring , Joel Stanley , Andrew Jeffery , Jean Delvare , Guenter Roeck , Arnd Bergmann , Olof Johansson , Jonathan Corbet , Borislav Petkov , Pierre-Louis Bossart , Tony Luck , Andy Shevchenko , Dan Williams , Randy Dunlap , Zev Weiss , David Muller , Dave Hansen , Jae Hyun Yoo , Iwona Winiarska Subject: [PATCH v4 05/13] peci: Add peci-aspeed controller driver Date: Tue, 23 Nov 2021 15:06:58 +0100 Message-Id: <20211123140706.2945700-6-iwona.winiarska@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211123140706.2945700-1-iwona.winiarska@intel.com> References: <20211123140706.2945700-1-iwona.winiarska@intel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211123_061010_291364_7E55C803 X-CRM114-Status: GOOD ( 28.95 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Jae Hyun Yoo ASPEED AST24xx/AST25xx/AST26xx SoCs support the PECI electrical interface (a.k.a PECI wire) that provides a communication channel with Intel processors. This driver allows BMC to discover devices connected to it and communicate with them using PECI protocol. Signed-off-by: Jae Hyun Yoo Co-developed-by: Iwona Winiarska Signed-off-by: Iwona Winiarska Reviewed-by: Pierre-Louis Bossart --- MAINTAINERS | 8 + drivers/peci/Kconfig | 6 + drivers/peci/Makefile | 3 + drivers/peci/controller/Kconfig | 17 + drivers/peci/controller/Makefile | 3 + drivers/peci/controller/peci-aspeed.c | 429 ++++++++++++++++++++++++++ 6 files changed, 466 insertions(+) create mode 100644 drivers/peci/controller/Kconfig create mode 100644 drivers/peci/controller/Makefile create mode 100644 drivers/peci/controller/peci-aspeed.c diff --git a/MAINTAINERS b/MAINTAINERS index a638be585207..093319d9b994 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2945,6 +2945,14 @@ S: Maintained F: Documentation/devicetree/bindings/net/asix,ax88796c.yaml F: drivers/net/ethernet/asix/ax88796c_* +ASPEED PECI CONTROLLER +M: Iwona Winiarska +L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers) +L: openbmc@lists.ozlabs.org (moderated for non-subscribers) +S: Supported +F: Documentation/devicetree/bindings/peci/peci-aspeed.yaml +F: drivers/peci/controller/peci-aspeed.c + ASPEED PINCTRL DRIVERS M: Andrew Jeffery L: linux-aspeed@lists.ozlabs.org (moderated for non-subscribers) diff --git a/drivers/peci/Kconfig b/drivers/peci/Kconfig index 71a4ad81225a..99279df97a78 100644 --- a/drivers/peci/Kconfig +++ b/drivers/peci/Kconfig @@ -13,3 +13,9 @@ menuconfig PECI This support is also available as a module. If so, the module will be called peci. + +if PECI + +source "drivers/peci/controller/Kconfig" + +endif # PECI diff --git a/drivers/peci/Makefile b/drivers/peci/Makefile index e789a354e842..926d8df15cbd 100644 --- a/drivers/peci/Makefile +++ b/drivers/peci/Makefile @@ -3,3 +3,6 @@ # Core functionality peci-y := core.o obj-$(CONFIG_PECI) += peci.o + +# Hardware specific bus drivers +obj-y += controller/ diff --git a/drivers/peci/controller/Kconfig b/drivers/peci/controller/Kconfig new file mode 100644 index 000000000000..3008b1b81049 --- /dev/null +++ b/drivers/peci/controller/Kconfig @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config PECI_ASPEED + tristate "ASPEED PECI support" + depends on ARCH_ASPEED || COMPILE_TEST + depends on OF + depends on HAS_IOMEM + help + This option enables PECI controller driver for ASPEED AST2400, + AST2500 and AST2600 SoCs. It allows BMC to discover devices + connected to it, and communicate with them using PECI protocol. + + Say Y here if your system runs on ASPEED SoC and you are using it + as BMC for Intel platform. + + This driver can also be built as a module. If so, the module will + be called peci-aspeed. diff --git a/drivers/peci/controller/Makefile b/drivers/peci/controller/Makefile new file mode 100644 index 000000000000..022c28ef1bf0 --- /dev/null +++ b/drivers/peci/controller/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only + +obj-$(CONFIG_PECI_ASPEED) += peci-aspeed.o diff --git a/drivers/peci/controller/peci-aspeed.c b/drivers/peci/controller/peci-aspeed.c new file mode 100644 index 000000000000..86c5f13508c1 --- /dev/null +++ b/drivers/peci/controller/peci-aspeed.c @@ -0,0 +1,429 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2012-2017 ASPEED Technology Inc. +// Copyright (c) 2018-2021 Intel Corporation + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* ASPEED PECI Registers */ +/* Control Register */ +#define ASPEED_PECI_CTRL 0x00 +#define ASPEED_PECI_CTRL_SAMPLING_MASK GENMASK(19, 16) +#define ASPEED_PECI_CTRL_RD_MODE_MASK GENMASK(13, 12) +#define ASPEED_PECI_CTRL_RD_MODE_DBG BIT(13) +#define ASPEED_PECI_CTRL_RD_MODE_COUNT BIT(12) +#define ASPEED_PECI_CTRL_CLK_SOURCE BIT(11) +#define ASPEED_PECI_CTRL_CLK_DIV_MASK GENMASK(10, 8) +#define ASPEED_PECI_CTRL_INVERT_OUT BIT(7) +#define ASPEED_PECI_CTRL_INVERT_IN BIT(6) +#define ASPEED_PECI_CTRL_BUS_CONTENTION_EN BIT(5) +#define ASPEED_PECI_CTRL_PECI_EN BIT(4) +#define ASPEED_PECI_CTRL_PECI_CLK_EN BIT(0) + +/* Timing Negotiation Register */ +#define ASPEED_PECI_TIMING_NEGOTIATION 0x04 +#define ASPEED_PECI_T_NEGO_MSG_MASK GENMASK(15, 8) +#define ASPEED_PECI_T_NEGO_ADDR_MASK GENMASK(7, 0) + +/* Command Register */ +#define ASPEED_PECI_CMD 0x08 +#define ASPEED_PECI_CMD_PIN_MONITORING BIT(31) +#define ASPEED_PECI_CMD_STS_MASK GENMASK(27, 24) +#define ASPEED_PECI_CMD_STS_ADDR_T_NEGO 0x3 +#define ASPEED_PECI_CMD_IDLE_MASK \ + (ASPEED_PECI_CMD_STS_MASK | ASPEED_PECI_CMD_PIN_MONITORING) +#define ASPEED_PECI_CMD_FIRE BIT(0) + +/* Read/Write Length Register */ +#define ASPEED_PECI_RW_LENGTH 0x0c +#define ASPEED_PECI_AW_FCS_EN BIT(31) +#define ASPEED_PECI_RD_LEN_MASK GENMASK(23, 16) +#define ASPEED_PECI_WR_LEN_MASK GENMASK(15, 8) +#define ASPEED_PECI_TARGET_ADDR_MASK GENMASK(7, 0) + +/* Expected FCS Data Register */ +#define ASPEED_PECI_EXPECTED_FCS 0x10 +#define ASPEED_PECI_EXPECTED_RD_FCS_MASK GENMASK(23, 16) +#define ASPEED_PECI_EXPECTED_AW_FCS_AUTO_MASK GENMASK(15, 8) +#define ASPEED_PECI_EXPECTED_WR_FCS_MASK GENMASK(7, 0) + +/* Captured FCS Data Register */ +#define ASPEED_PECI_CAPTURED_FCS 0x14 +#define ASPEED_PECI_CAPTURED_RD_FCS_MASK GENMASK(23, 16) +#define ASPEED_PECI_CAPTURED_WR_FCS_MASK GENMASK(7, 0) + +/* Interrupt Register */ +#define ASPEED_PECI_INT_CTRL 0x18 +#define ASPEED_PECI_TIMING_NEGO_SEL_MASK GENMASK(31, 30) +#define ASPEED_PECI_1ST_BIT_OF_ADDR_NEGO 0 +#define ASPEED_PECI_2ND_BIT_OF_ADDR_NEGO 1 +#define ASPEED_PECI_MESSAGE_NEGO 2 +#define ASPEED_PECI_INT_MASK GENMASK(4, 0) +#define ASPEED_PECI_INT_BUS_TIMEOUT BIT(4) +#define ASPEED_PECI_INT_BUS_CONTENTION BIT(3) +#define ASPEED_PECI_INT_WR_FCS_BAD BIT(2) +#define ASPEED_PECI_INT_WR_FCS_ABORT BIT(1) +#define ASPEED_PECI_INT_CMD_DONE BIT(0) + +/* Interrupt Status Register */ +#define ASPEED_PECI_INT_STS 0x1c +#define ASPEED_PECI_INT_TIMING_RESULT_MASK GENMASK(29, 16) + /* bits[4..0]: Same bit fields in the 'Interrupt Register' */ + +/* Rx/Tx Data Buffer Registers */ +#define ASPEED_PECI_WR_DATA0 0x20 +#define ASPEED_PECI_WR_DATA1 0x24 +#define ASPEED_PECI_WR_DATA2 0x28 +#define ASPEED_PECI_WR_DATA3 0x2c +#define ASPEED_PECI_RD_DATA0 0x30 +#define ASPEED_PECI_RD_DATA1 0x34 +#define ASPEED_PECI_RD_DATA2 0x38 +#define ASPEED_PECI_RD_DATA3 0x3c +#define ASPEED_PECI_WR_DATA4 0x40 +#define ASPEED_PECI_WR_DATA5 0x44 +#define ASPEED_PECI_WR_DATA6 0x48 +#define ASPEED_PECI_WR_DATA7 0x4c +#define ASPEED_PECI_RD_DATA4 0x50 +#define ASPEED_PECI_RD_DATA5 0x54 +#define ASPEED_PECI_RD_DATA6 0x58 +#define ASPEED_PECI_RD_DATA7 0x5c +#define ASPEED_PECI_DATA_BUF_SIZE_MAX 32 + +/* Timing Negotiation */ +#define ASPEED_PECI_RD_SAMPLING_POINT_DEFAULT 8 +#define ASPEED_PECI_RD_SAMPLING_POINT_MAX (BIT(4) - 1) +#define ASPEED_PECI_CLK_DIV_DEFAULT 0 +#define ASPEED_PECI_CLK_DIV_MAX (BIT(3) - 1) +#define ASPEED_PECI_MSG_TIMING_DEFAULT 1 +#define ASPEED_PECI_MSG_TIMING_MAX (BIT(8) - 1) +#define ASPEED_PECI_ADDR_TIMING_DEFAULT 1 +#define ASPEED_PECI_ADDR_TIMING_MAX (BIT(8) - 1) + +/* Timeout */ +#define ASPEED_PECI_IDLE_CHECK_TIMEOUT_US (50 * USEC_PER_MSEC) +#define ASPEED_PECI_IDLE_CHECK_INTERVAL_US (10 * USEC_PER_MSEC) +#define ASPEED_PECI_CMD_TIMEOUT_MS_DEFAULT (1000) +#define ASPEED_PECI_CMD_TIMEOUT_MS_MAX (1000) + +struct aspeed_peci { + struct peci_controller *controller; + struct device *dev; + void __iomem *base; + struct clk *clk; + struct reset_control *rst; + int irq; + spinlock_t lock; /* to sync completion status handling */ + struct completion xfer_complete; + u32 status; + u32 cmd_timeout_ms; + u32 msg_timing; + u32 addr_timing; + u32 rd_sampling_point; + u32 clk_div; +}; + +static void aspeed_peci_init_regs(struct aspeed_peci *priv) +{ + u32 val; + + val = FIELD_PREP(ASPEED_PECI_CTRL_CLK_DIV_MASK, ASPEED_PECI_CLK_DIV_DEFAULT); + val |= ASPEED_PECI_CTRL_PECI_CLK_EN; + writel(val, priv->base + ASPEED_PECI_CTRL); + /* + * Timing negotiation period setting. + * The unit of the programmed value is 4 times of PECI clock period. + */ + val = FIELD_PREP(ASPEED_PECI_T_NEGO_MSG_MASK, priv->msg_timing); + val |= FIELD_PREP(ASPEED_PECI_T_NEGO_ADDR_MASK, priv->addr_timing); + writel(val, priv->base + ASPEED_PECI_TIMING_NEGOTIATION); + + /* Clear interrupts */ + val = readl(priv->base + ASPEED_PECI_INT_STS) | ASPEED_PECI_INT_MASK; + writel(val, priv->base + ASPEED_PECI_INT_STS); + + /* Set timing negotiation mode and enable interrupts */ + val = FIELD_PREP(ASPEED_PECI_TIMING_NEGO_SEL_MASK, ASPEED_PECI_1ST_BIT_OF_ADDR_NEGO); + val |= ASPEED_PECI_INT_MASK; + writel(val, priv->base + ASPEED_PECI_INT_CTRL); + + val = FIELD_PREP(ASPEED_PECI_CTRL_SAMPLING_MASK, priv->rd_sampling_point); + val |= FIELD_PREP(ASPEED_PECI_CTRL_CLK_DIV_MASK, priv->clk_div); + val |= ASPEED_PECI_CTRL_PECI_EN; + val |= ASPEED_PECI_CTRL_PECI_CLK_EN; + writel(val, priv->base + ASPEED_PECI_CTRL); +} + +static inline int aspeed_peci_check_idle(struct aspeed_peci *priv) +{ + u32 cmd_sts = readl(priv->base + ASPEED_PECI_CMD); + + if (FIELD_GET(ASPEED_PECI_CMD_STS_MASK, cmd_sts) == ASPEED_PECI_CMD_STS_ADDR_T_NEGO) + aspeed_peci_init_regs(priv); + + return readl_poll_timeout(priv->base + ASPEED_PECI_CMD, + cmd_sts, + !(cmd_sts & ASPEED_PECI_CMD_IDLE_MASK), + ASPEED_PECI_IDLE_CHECK_INTERVAL_US, + ASPEED_PECI_IDLE_CHECK_TIMEOUT_US); +} + +static int aspeed_peci_xfer(struct peci_controller *controller, + u8 addr, struct peci_request *req) +{ + struct aspeed_peci *priv = dev_get_drvdata(controller->dev.parent); + unsigned long timeout = msecs_to_jiffies(priv->cmd_timeout_ms); + u32 peci_head; + int ret; + + if (req->tx.len > ASPEED_PECI_DATA_BUF_SIZE_MAX || + req->rx.len > ASPEED_PECI_DATA_BUF_SIZE_MAX) + return -EINVAL; + + /* Check command sts and bus idle state */ + ret = aspeed_peci_check_idle(priv); + if (ret) + return ret; /* -ETIMEDOUT */ + + spin_lock_irq(&priv->lock); + reinit_completion(&priv->xfer_complete); + + peci_head = FIELD_PREP(ASPEED_PECI_TARGET_ADDR_MASK, addr) | + FIELD_PREP(ASPEED_PECI_WR_LEN_MASK, req->tx.len) | + FIELD_PREP(ASPEED_PECI_RD_LEN_MASK, req->rx.len); + + writel(peci_head, priv->base + ASPEED_PECI_RW_LENGTH); + + memcpy_toio(priv->base + ASPEED_PECI_WR_DATA0, req->tx.buf, min_t(u8, req->tx.len, 16)); + if (req->tx.len > 16) + memcpy_toio(priv->base + ASPEED_PECI_WR_DATA4, req->tx.buf + 16, + req->tx.len - 16); + +#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG) + dev_dbg(priv->dev, "HEAD : %#08x\n", peci_head); + print_hex_dump_bytes("TX : ", DUMP_PREFIX_NONE, req->tx.buf, req->tx.len); +#endif + priv->status = 0; + writel(ASPEED_PECI_CMD_FIRE, priv->base + ASPEED_PECI_CMD); + spin_unlock_irq(&priv->lock); + + ret = wait_for_completion_interruptible_timeout(&priv->xfer_complete, timeout); + if (ret < 0) + return ret; + + if (ret == 0) { + dev_dbg(priv->dev, "Timeout waiting for a response!\n"); + return -ETIMEDOUT; + } + + spin_lock_irq(&priv->lock); + + if (priv->status != ASPEED_PECI_INT_CMD_DONE) { + spin_unlock_irq(&priv->lock); + dev_dbg(priv->dev, "No valid response, status: %#02x\n", priv->status); + return -EIO; + } + + spin_unlock_irq(&priv->lock); + + memcpy_fromio(req->rx.buf, priv->base + ASPEED_PECI_RD_DATA0, min_t(u8, req->rx.len, 16)); + if (req->rx.len > 16) + memcpy_fromio(req->rx.buf + 16, priv->base + ASPEED_PECI_RD_DATA4, + req->rx.len - 16); + +#if IS_ENABLED(CONFIG_DYNAMIC_DEBUG) + print_hex_dump_bytes("RX : ", DUMP_PREFIX_NONE, req->rx.buf, req->rx.len); +#endif + return 0; +} + +static irqreturn_t aspeed_peci_irq_handler(int irq, void *arg) +{ + struct aspeed_peci *priv = arg; + u32 status; + + spin_lock(&priv->lock); + status = readl(priv->base + ASPEED_PECI_INT_STS); + writel(status, priv->base + ASPEED_PECI_INT_STS); + priv->status |= (status & ASPEED_PECI_INT_MASK); + + /* + * All commands should be ended up with a ASPEED_PECI_INT_CMD_DONE bit + * set even in an error case. + */ + if (status & ASPEED_PECI_INT_CMD_DONE) + complete(&priv->xfer_complete); + + writel(0, priv->base + ASPEED_PECI_CMD); + + spin_unlock(&priv->lock); + + return IRQ_HANDLED; +} + +static void aspeed_peci_property_sanitize(struct device *dev, const char *propname, + u32 min, u32 max, u32 default_val, u32 *propval) +{ + u32 val; + int ret; + + ret = device_property_read_u32(dev, propname, &val); + if (ret) { + val = default_val; + } else if (val > max || val < min) { + dev_warn(dev, "Invalid %s: %u, falling back to: %u\n", + propname, val, default_val); + + val = default_val; + } + + *propval = val; +} + +static void aspeed_peci_property_setup(struct aspeed_peci *priv) +{ + aspeed_peci_property_sanitize(priv->dev, "aspeed,clock-divider", + 0, ASPEED_PECI_CLK_DIV_MAX, + ASPEED_PECI_CLK_DIV_DEFAULT, &priv->clk_div); + aspeed_peci_property_sanitize(priv->dev, "aspeed,msg-timing", + 0, ASPEED_PECI_MSG_TIMING_MAX, + ASPEED_PECI_MSG_TIMING_DEFAULT, &priv->msg_timing); + aspeed_peci_property_sanitize(priv->dev, "aspeed,addr-timing", + 0, ASPEED_PECI_ADDR_TIMING_MAX, + ASPEED_PECI_ADDR_TIMING_DEFAULT, &priv->addr_timing); + aspeed_peci_property_sanitize(priv->dev, "aspeed,rd-sampling-point", + 0, ASPEED_PECI_RD_SAMPLING_POINT_MAX, + ASPEED_PECI_RD_SAMPLING_POINT_DEFAULT, + &priv->rd_sampling_point); + aspeed_peci_property_sanitize(priv->dev, "cmd-timeout-ms", + 1, ASPEED_PECI_CMD_TIMEOUT_MS_MAX, + ASPEED_PECI_CMD_TIMEOUT_MS_DEFAULT, &priv->cmd_timeout_ms); +} + +static struct peci_controller_ops aspeed_ops = { + .xfer = aspeed_peci_xfer, +}; + +static void aspeed_peci_reset_control_release(void *data) +{ + reset_control_assert(data); +} + +static int devm_aspeed_peci_reset_control_deassert(struct device *dev, struct reset_control *rst) +{ + int ret; + + ret = reset_control_deassert(rst); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, aspeed_peci_reset_control_release, rst); +} + +static void aspeed_peci_clk_release(void *data) +{ + clk_disable_unprepare(data); +} + +static int devm_aspeed_peci_clk_enable(struct device *dev, struct clk *clk) +{ + int ret; + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + return devm_add_action_or_reset(dev, aspeed_peci_clk_release, clk); +} + +static int aspeed_peci_probe(struct platform_device *pdev) +{ + struct peci_controller *controller; + struct aspeed_peci *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + dev_set_drvdata(priv->dev, priv); + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->irq = platform_get_irq(pdev, 0); + if (!priv->irq) + return priv->irq; + + ret = devm_request_irq(&pdev->dev, priv->irq, aspeed_peci_irq_handler, + 0, "peci-aspeed", priv); + if (ret) + return ret; + + init_completion(&priv->xfer_complete); + spin_lock_init(&priv->lock); + + priv->rst = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(priv->rst)) + return dev_err_probe(priv->dev, PTR_ERR(priv->rst), + "failed to get reset control\n"); + + ret = devm_aspeed_peci_reset_control_deassert(priv->dev, priv->rst); + if (ret) + return dev_err_probe(priv->dev, ret, "cannot deassert reset control\n"); + + priv->clk = devm_clk_get(priv->dev, NULL); + if (IS_ERR(priv->clk)) + return dev_err_probe(priv->dev, PTR_ERR(priv->clk), "failed to get clk\n"); + + ret = devm_aspeed_peci_clk_enable(priv->dev, priv->clk); + if (ret) + return dev_err_probe(priv->dev, ret, "failed to enable clock\n"); + + aspeed_peci_property_setup(priv); + + aspeed_peci_init_regs(priv); + + controller = devm_peci_controller_add(priv->dev, &aspeed_ops); + if (IS_ERR(controller)) + return dev_err_probe(priv->dev, PTR_ERR(controller), + "failed to add aspeed peci controller\n"); + + priv->controller = controller; + + return 0; +} + +static const struct of_device_id aspeed_peci_of_table[] = { + { .compatible = "aspeed,ast2400-peci", }, + { .compatible = "aspeed,ast2500-peci", }, + { .compatible = "aspeed,ast2600-peci", }, + { } +}; +MODULE_DEVICE_TABLE(of, aspeed_peci_of_table); + +static struct platform_driver aspeed_peci_driver = { + .probe = aspeed_peci_probe, + .driver = { + .name = "peci-aspeed", + .of_match_table = aspeed_peci_of_table, + }, +}; +module_platform_driver(aspeed_peci_driver); + +MODULE_AUTHOR("Ryan Chen "); +MODULE_AUTHOR("Jae Hyun Yoo "); +MODULE_DESCRIPTION("ASPEED PECI driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PECI);