From patchwork Fri Feb 19 14:25:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Jeffery X-Patchwork-Id: 385403 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8AC7C433DB for ; Fri, 19 Feb 2021 14:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9611E64EB7 for ; Fri, 19 Feb 2021 14:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231136AbhBSO2Z (ORCPT ); Fri, 19 Feb 2021 09:28:25 -0500 Received: from new3-smtp.messagingengine.com ([66.111.4.229]:60053 "EHLO new3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230511AbhBSO2H (ORCPT ); Fri, 19 Feb 2021 09:28:07 -0500 Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailnew.nyi.internal (Postfix) with ESMTP id 7C85D5803BC; Fri, 19 Feb 2021 09:27:20 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Fri, 19 Feb 2021 09:27:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aj.id.au; h=from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm2; bh=m3dd7+D6wrA7l A9odvoTzurf1fziuhUod1wrNxjTf+U=; b=i0UZq88k/VyXkUWZsK6ClbBbTXhRD 3NBploi3IQMpqu8CXswE0K5+LbA1rJiDpy8nemRZvBPiyxMDvmHItmvItQRtuD9P em78TkMy1DkoqOanHoQpnFb0Cw6y2QTmQzGaIBTkuWdQ4RzSFmrk2fQHeHWKR1iW qyWOVlbqr0lopenFGLzxLnE56nUCgd1UpqeiDjhkiruLWz6SnaHQfa6z1t8XdU83 jMxCbPDkMIUOBG5lkuZdywTwcg/EMyoC+/lAxpxf4pMHCbY3h8BCDsRp+fOtSIsI slwz0v9ZA/SvCB/LcxuPVK+IO9KSwxyA3guRT1LyIwBH2X6KmpJmfDZJw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:date:from :in-reply-to:message-id:mime-version:references:subject:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm2; bh=m3dd7+D6wrA7lA9odvoTzurf1fziuhUod1wrNxjTf+U=; b=LyQayqLG NV0/4ivDxQYpcmcoQdVSUDzKwVXmIvyY50uGeoZUOVQHjds83khRh2RLoQ6DOwke NDizMehDs2tDuweT8wr+FNk619tCK0apL1kPodENo0QQ248gcynuCL/CAXIBj0K0 MBTHptWjEwzW2+7Vxuo9apLjubCY4EQZhHgiE37P3vnUNUYYlCrKFJygOk1Uou3+ piI8EUl1ulC/1VO1W6Zpx6jjZbHs86OFAjaiBkzGMrzc1tPw0+kB3XLWnNUQtPBJ 2b833bCwwmd61s0SBsitYPwo6tS6Iu7H2B8PWnkn0vStK8ao1LK2Wh4uuQLfwb8Y metEj96WMz/56A== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrjeeigdeigecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhephffvufffkffojghfggfgsedtkeertd ertddtnecuhfhrohhmpeetnhgurhgvficulfgvfhhfvghrhicuoegrnhgurhgvfiesrghj rdhiugdrrghuqeenucggtffrrghtthgvrhhnpeejgfdvveehteekveeggeellefgleette ejffelffdvudduveeiffegteelvefhteenucfkphepudegrddvrdeluddrfeejnecuvehl uhhsthgvrhfuihiivgepkeenucfrrghrrghmpehmrghilhhfrhhomheprghnughrvgifse grjhdrihgurdgruh X-ME-Proxy: Received: from localhost.localdomain (ppp14-2-91-37.adl-apt-pir-bras31.tpg.internode.on.net [14.2.91.37]) by mail.messagingengine.com (Postfix) with ESMTPA id 1AEF8240057; Fri, 19 Feb 2021 09:27:13 -0500 (EST) From: Andrew Jeffery To: openipmi-developer@lists.sourceforge.net, openbmc@lists.ozlabs.org, minyard@acm.org Cc: robh+dt@kernel.org, joel@jms.id.au, lee.jones@linaro.org, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, linus.walleij@linaro.org, chiawei_wang@aspeedtech.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-gpio@vger.kernel.org Subject: [PATCH 14/19] ipmi: kcs_bmc: Allow clients to control KCS IRQ state Date: Sat, 20 Feb 2021 00:55:18 +1030 Message-Id: <20210219142523.3464540-15-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210219142523.3464540-1-andrew@aj.id.au> References: <20210219142523.3464540-1-andrew@aj.id.au> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add a mechanism for controlling whether the client associated with a KCS device will receive Input Buffer Full (IBF) and Output Buffer Empty (OBE) events. This enables an abstract implementation of poll() for KCS devices. A wart in the implementation is that the ASPEED KCS devices don't support an OBE interrupt for the BMC. Instead we pretend it has one by polling the status register waiting for the Output Buffer Full (OBF) bit to clear, and generating an event when OBE is observed. Signed-off-by: Andrew Jeffery --- drivers/char/ipmi/kcs_bmc.c | 6 ++ drivers/char/ipmi/kcs_bmc.h | 3 + drivers/char/ipmi/kcs_bmc_aspeed.c | 150 ++++++++++++++++++---------- drivers/char/ipmi/kcs_bmc_client.h | 2 + drivers/char/ipmi/kcs_bmc_device.h | 1 + drivers/char/ipmi/kcs_bmc_npcm7xx.c | 25 ++++- 6 files changed, 130 insertions(+), 57 deletions(-) diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c index 694db6ee2a92..05bbb72418b2 100644 --- a/drivers/char/ipmi/kcs_bmc.c +++ b/drivers/char/ipmi/kcs_bmc.c @@ -184,6 +184,12 @@ int kcs_bmc_unregister_cdev(struct kcs_bmc_cdev *cdev) } EXPORT_SYMBOL(kcs_bmc_unregister_cdev); +void kcs_bmc_update_event_mask(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 events) +{ + kcs_bmc->ops->irq_mask_update(kcs_bmc, mask, events); +} +EXPORT_SYMBOL(kcs_bmc_update_event_mask); + MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Haiyue Wang "); MODULE_AUTHOR("Andrew Jeffery "); diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h index 5deb9a0b8e60..11fff935218c 100644 --- a/drivers/char/ipmi/kcs_bmc.h +++ b/drivers/char/ipmi/kcs_bmc.h @@ -11,6 +11,9 @@ #define KCS_BMC_EVENT_NONE 0 #define KCS_BMC_EVENT_HANDLED 1 +#define KCS_BMC_EVENT_TYPE_OBE BIT(0) +#define KCS_BMC_EVENT_TYPE_IBF BIT(1) + #define KCS_BMC_STR_OBF BIT(0) #define KCS_BMC_STR_IBF BIT(1) #define KCS_BMC_STR_CMD_DAT BIT(3) diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c index 6f26e7366c0b..17afe9449e72 100644 --- a/drivers/char/ipmi/kcs_bmc_aspeed.c +++ b/drivers/char/ipmi/kcs_bmc_aspeed.c @@ -60,10 +60,18 @@ #define LPC_ODR4 0x118 #define LPC_STR4 0x11C +#define OBE_POLL_PERIOD (2 * HZ) + struct aspeed_kcs_bmc { struct kcs_bmc_device kcs_bmc; struct regmap *map; + + struct { + spinlock_t lock; + bool remove; + struct timer_list timer; + } obe; }; struct aspeed_kcs_of_ops { @@ -159,68 +167,89 @@ static void aspeed_kcs_enable_channel(struct kcs_bmc_device *kcs_bmc, bool enabl switch (kcs_bmc->channel) { case 1: - if (enable) { - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF1, LPC_HICR2_IBFIF1); - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC1E, LPC_HICR0_LPC1E); - } else { - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC1E, 0); - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF1, 0); - } - break; - + regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC1E, enable * LPC_HICR0_LPC1E); + return; case 2: - if (enable) { - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF2, LPC_HICR2_IBFIF2); - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC2E, LPC_HICR0_LPC2E); - } else { - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC2E, 0); - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF2, 0); - } - break; - + regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC2E, enable * LPC_HICR0_LPC2E); + return; case 3: - if (enable) { - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF3, LPC_HICR2_IBFIF3); - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC3E, LPC_HICR0_LPC3E); - regmap_update_bits(priv->map, LPC_HICR4, - LPC_HICR4_KCSENBL, LPC_HICR4_KCSENBL); - } else { - regmap_update_bits(priv->map, LPC_HICR0, - LPC_HICR0_LPC3E, 0); - regmap_update_bits(priv->map, LPC_HICR4, - LPC_HICR4_KCSENBL, 0); - regmap_update_bits(priv->map, LPC_HICR2, - LPC_HICR2_IBFIF3, 0); - } - break; - + regmap_update_bits(priv->map, LPC_HICR0, LPC_HICR0_LPC3E, enable * LPC_HICR0_LPC3E); + regmap_update_bits(priv->map, LPC_HICR4, + LPC_HICR4_KCSENBL, enable * LPC_HICR4_KCSENBL); + return; case 4: - if (enable) - regmap_update_bits(priv->map, LPC_HICRB, - LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E, - LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E); + regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_LPC4E, enable * LPC_HICRB_LPC4E); + return; + default: + pr_warn("%s: Unsupported channel: %d", __func__, kcs_bmc->channel); + return; + } +} + +static void aspeed_kcs_check_obe(struct timer_list *timer) +{ + struct aspeed_kcs_bmc *priv = container_of(timer, struct aspeed_kcs_bmc, obe.timer); + unsigned long flags; + u8 str; + + spin_lock_irqsave(&priv->obe.lock, flags); + if (priv->obe.remove) { + spin_unlock_irqrestore(&priv->obe.lock, flags); + return; + } + + str = aspeed_kcs_inb(&priv->kcs_bmc, priv->kcs_bmc.ioreg.str); + if (str & KCS_BMC_STR_OBF) { + mod_timer(timer, jiffies + OBE_POLL_PERIOD); + spin_unlock_irqrestore(&priv->obe.lock, flags); + return; + } + spin_unlock_irqrestore(&priv->obe.lock, flags); + + kcs_bmc_handle_event(&priv->kcs_bmc); +} + +static void aspeed_kcs_irq_mask_update(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 state) +{ + struct aspeed_kcs_bmc *priv = to_aspeed_kcs_bmc(kcs_bmc); + + /* We don't have an OBE IRQ, emulate it */ + if (KCS_BMC_EVENT_TYPE_OBE & mask) { + if (KCS_BMC_EVENT_TYPE_OBE & state) + mod_timer(&priv->obe.timer, jiffies + OBE_POLL_PERIOD); else - regmap_update_bits(priv->map, LPC_HICRB, - LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E, - 0); - break; + del_timer(&priv->obe.timer); + } - default: - break; + if (KCS_BMC_EVENT_TYPE_IBF & mask) { + const bool enable = !!(KCS_BMC_EVENT_TYPE_IBF & state); + + switch (kcs_bmc->channel) { + case 1: + regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIF1, + enable * LPC_HICR2_IBFIF1); + return; + case 2: + regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIF2, + enable * LPC_HICR2_IBFIF2); + return; + case 3: + regmap_update_bits(priv->map, LPC_HICR2, LPC_HICR2_IBFIF3, + enable * LPC_HICR2_IBFIF3); + return; + case 4: + regmap_update_bits(priv->map, LPC_HICRB, LPC_HICRB_IBFIF4, + enable * LPC_HICRB_IBFIF4); + return; + default: + pr_warn("%s: Unsupported channel: %d", __func__, kcs_bmc->channel); + return; + } } } static const struct kcs_bmc_device_ops aspeed_kcs_ops = { + .irq_mask_update = aspeed_kcs_irq_mask_update, .io_inputb = aspeed_kcs_inb, .io_outputb = aspeed_kcs_outb, .io_updateb = aspeed_kcs_updateb, @@ -378,6 +407,10 @@ static int aspeed_kcs_probe(struct platform_device *pdev) return -ENODEV; } + spin_lock_init(&priv->obe.lock); + priv->obe.remove = false; + timer_setup(&priv->obe.timer, aspeed_kcs_check_obe, 0); + aspeed_kcs_set_address(kcs_bmc, addr); rc = aspeed_kcs_config_irq(kcs_bmc, pdev); @@ -386,6 +419,8 @@ static int aspeed_kcs_probe(struct platform_device *pdev) platform_set_drvdata(pdev, priv); + aspeed_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), + KCS_BMC_EVENT_TYPE_IBF); aspeed_kcs_enable_channel(kcs_bmc, true); rc = kcs_bmc_add_device(&priv->kcs_bmc); @@ -404,6 +439,15 @@ static int aspeed_kcs_remove(struct platform_device *pdev) kcs_bmc_remove_device(kcs_bmc); + aspeed_kcs_enable_channel(kcs_bmc, false); + aspeed_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0); + + /* Make sure it's proper dead */ + spin_lock_irq(&priv->obe.lock); + priv->obe.remove = true; + spin_unlock_irq(&priv->obe.lock); + del_timer_sync(&priv->obe.timer); + return 0; } diff --git a/drivers/char/ipmi/kcs_bmc_client.h b/drivers/char/ipmi/kcs_bmc_client.h index d0a7404ff584..456796da33de 100644 --- a/drivers/char/ipmi/kcs_bmc_client.h +++ b/drivers/char/ipmi/kcs_bmc_client.h @@ -37,6 +37,8 @@ int kcs_bmc_unregister_cdev(struct kcs_bmc_cdev *cdev); int kcs_bmc_enable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client); void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client); +void kcs_bmc_update_event_mask(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 events); + u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc); void kcs_bmc_write_data(struct kcs_bmc_device *kcs_bmc, u8 data); u8 kcs_bmc_read_status(struct kcs_bmc_device *kcs_bmc); diff --git a/drivers/char/ipmi/kcs_bmc_device.h b/drivers/char/ipmi/kcs_bmc_device.h index 57b7174b2bac..f1ca8912496a 100644 --- a/drivers/char/ipmi/kcs_bmc_device.h +++ b/drivers/char/ipmi/kcs_bmc_device.h @@ -7,6 +7,7 @@ #include "kcs_bmc.h" struct kcs_bmc_device_ops { + void (*irq_mask_update)(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 enable); u8 (*io_inputb)(struct kcs_bmc_device *kcs_bmc, u32 reg); void (*io_outputb)(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 b); void (*io_updateb)(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 mask, u8 b); diff --git a/drivers/char/ipmi/kcs_bmc_npcm7xx.c b/drivers/char/ipmi/kcs_bmc_npcm7xx.c index dce93ec895fc..c2032728a03d 100644 --- a/drivers/char/ipmi/kcs_bmc_npcm7xx.c +++ b/drivers/char/ipmi/kcs_bmc_npcm7xx.c @@ -38,6 +38,7 @@ #define KCS2CTL 0x2A #define KCS3CTL 0x3C #define KCS_CTL_IBFIE BIT(0) +#define KCS_CTL_OBEIE BIT(0) #define KCS1IE 0x1C #define KCS2IE 0x2E @@ -117,13 +118,23 @@ static void npcm7xx_kcs_enable_channel(struct kcs_bmc_device *kcs_bmc, bool enab { struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc); - regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE, - enable ? KCS_CTL_IBFIE : 0); - regmap_update_bits(priv->map, priv->reg->ie, KCS_IE_IRQE | KCS_IE_HIRQE, enable ? KCS_IE_IRQE | KCS_IE_HIRQE : 0); } +static void npcm7xx_kcs_irq_mask_update(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 state) +{ + struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc); + + if (KCS_BMC_EVENT_TYPE_OBE & mask) + regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_OBEIE, + !!(KCS_BMC_EVENT_TYPE_OBE & state) * KCS_CTL_OBEIE); + + if (KCS_BMC_EVENT_TYPE_IBF & mask) + regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE, + !!(KCS_BMC_EVENT_TYPE_IBF & state) * KCS_CTL_IBFIE); +} + static irqreturn_t npcm7xx_kcs_irq(int irq, void *arg) { struct kcs_bmc_device *kcs_bmc = arg; @@ -151,6 +162,7 @@ static int npcm7xx_kcs_config_irq(struct kcs_bmc_device *kcs_bmc, } static const struct kcs_bmc_device_ops npcm7xx_kcs_ops = { + .irq_mask_update = npcm7xx_kcs_irq_mask_update, .io_inputb = npcm7xx_kcs_inb, .io_outputb = npcm7xx_kcs_outb, .io_updateb = npcm7xx_kcs_updateb, @@ -191,11 +203,13 @@ static int npcm7xx_kcs_probe(struct platform_device *pdev) platform_set_drvdata(pdev, priv); - npcm7xx_kcs_enable_channel(kcs_bmc, true); rc = npcm7xx_kcs_config_irq(kcs_bmc, pdev); if (rc) return rc; + npcm7xx_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), + KCS_BMC_EVENT_TYPE_IBF); + npcm7xx_kcs_enable_channel(kcs_bmc, true); pr_info("channel=%u idr=0x%x odr=0x%x str=0x%x\n", chan, @@ -211,6 +225,9 @@ static int npcm7xx_kcs_remove(struct platform_device *pdev) kcs_bmc_remove_device(kcs_bmc); + npcm7xx_kcs_enable_channel(kcs_bmc, false); + npcm7xx_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0); + return 0; }