From patchwork Tue Jan 12 05:59:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Holland X-Patchwork-Id: 362392 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=ham 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 588AAC43381 for ; Tue, 12 Jan 2021 06:00:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E637222F9 for ; Tue, 12 Jan 2021 06:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730785AbhALGAl (ORCPT ); Tue, 12 Jan 2021 01:00:41 -0500 Received: from new3-smtp.messagingengine.com ([66.111.4.229]:60915 "EHLO new3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730979AbhALGAk (ORCPT ); Tue, 12 Jan 2021 01:00:40 -0500 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailnew.nyi.internal (Postfix) with ESMTP id 03F7E58055B; Tue, 12 Jan 2021 00:59:54 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute5.internal (MEProxy); Tue, 12 Jan 2021 00:59:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sholland.org; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=fm1; bh=/0Z5BCxz8WuCb 22aaUC78cmR3ShB9vJmj0kAUg62Cvc=; b=LGRNbyWaqV8RcYOWwmtoUmnrXgXrJ 9HyGVOWTvfa8mHKsCvIdLjK8U24hyzpxHj4+kIAchGNmE4BJnfsmtn4+5jEKyrro Xmepvl8aGTTzcuykfS5O4k2vsFwoTbjzOyo04wNzgm3RspA25JN8ayodVpTQkvE5 WlidxcXmPoQ1ul2eEPEADI5NzYTPHW8X7IpUkMIK6enFAR8xzuLtwHtENZ+8CX2u HoL/4k6Sb9ticBSssPOUTKf2hEOSIxmLBK5qilbpN7qv1WoFC8ntce/q5q4aW7sm XeKaj0iUw2ildvfDKQ14ao3TKprMAAt/zvxdgWRgqW6JxnSFA8DcLGTOw== 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= fm1; bh=/0Z5BCxz8WuCb22aaUC78cmR3ShB9vJmj0kAUg62Cvc=; b=ojQ7ilTQ vyIo5A2nfTHOmPrhNJhYjeADBa3wuZp5vyG6Zex4E8sCF5eOV8Kq3gfoM0SVchoj ljcMYNvCre5uHIdXmXWH7TfMAs7oZWv+Lbm9nF3Pt7EIoKzyt8n24RD+C9nrasWx iaGo9jPavyPI8fLcYT2xF9GRybV9AqXTmY2JStOkiDLe6JbBfK1r/CWGZoQFsfmA lxdRTV/CCiT/tA8RS2NsvMm96ueUUCJ21lUWExZ/CPbT1qnqEvr8tjpZN+cVIATc uo20pqRdFcrFn0tGSrWmzVFXworbr2mqvMQb0Zf2ghGBc2kqeE3es4et7uPq8QMj JNZK+GSKxNm77w== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedrvdehvddgleduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpefurghmuhgv lhcujfholhhlrghnugcuoehsrghmuhgvlhesshhhohhllhgrnhgurdhorhhgqeenucggtf frrghtthgvrhhnpeduhfejfedvhffgfeehtefghfeiiefgfeehgfdvvdevfeegjeehjedv gfejheeuieenucfkphepjedtrddufeehrddugeekrdduhedunecuvehluhhsthgvrhfuih iivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepshgrmhhuvghlsehshhholhhlrghn ugdrohhrgh X-ME-Proxy: Received: from titanium.stl.sholland.net (70-135-148-151.lightspeed.stlsmo.sbcglobal.net [70.135.148.151]) by mail.messagingengine.com (Postfix) with ESMTPA id 5431F24005B; Tue, 12 Jan 2021 00:59:53 -0500 (EST) From: Samuel Holland To: Thomas Gleixner , Marc Zyngier , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec Cc: Ondrej Jirman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Samuel Holland Subject: [PATCH v4 04/10] irqchip/sun6i-r: Add wakeup support Date: Mon, 11 Jan 2021 23:59:44 -0600 Message-Id: <20210112055950.21209-5-samuel@sholland.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210112055950.21209-1-samuel@sholland.org> References: <20210112055950.21209-1-samuel@sholland.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Maintain bitmaps of wake-enabled IRQs and mux inputs, and program them to the hardware during the syscore phase of suspend and shutdown. Then restore the original set of enabled IRQs (only the NMI) during resume. This serves two purposes. First, it lets power management firmware running on the ARISC coprocessor know which wakeup sources Linux wants to have enabled. That way, it can avoid turning them off when it shuts down the remainder of the clock tree. Second, it preconfigures the coprocessor's interrupt controller, so the firmware's wakeup logic is as simple as waiting for an interrupt to arrive. The suspend/resume logic is not conditional on PM_SLEEP because it is identical to the init/shutdown logic. Wake IRQs may be enabled during shutdown to allow powering the board back on. As an example, see commit a5c5e50cce9d ("Input: gpio-keys - add shutdown callback"). Signed-off-by: Samuel Holland --- drivers/irqchip/irq-sun6i-r.c | 107 ++++++++++++++++++++++++++++++++-- 1 file changed, 101 insertions(+), 6 deletions(-) diff --git a/drivers/irqchip/irq-sun6i-r.c b/drivers/irqchip/irq-sun6i-r.c index d04d067423f4..a1b58c98d6ca 100644 --- a/drivers/irqchip/irq-sun6i-r.c +++ b/drivers/irqchip/irq-sun6i-r.c @@ -39,6 +39,7 @@ * set of 128 mux bits. This requires a second set of top-level registers. */ +#include #include #include #include @@ -46,6 +47,7 @@ #include #include #include +#include #include @@ -67,8 +69,17 @@ #define SUN6I_NR_DIRECT_IRQS 16 #define SUN6I_NR_MUX_BITS 128 +struct sun6i_r_intc_variant { + u32 first_mux_irq; + u32 nr_mux_irqs; + u32 mux_valid[BITS_TO_U32(SUN6I_NR_MUX_BITS)]; +}; + static void __iomem *base; static irq_hw_number_t nmi_hwirq; +static DECLARE_BITMAP(wake_irq_enabled, SUN6I_NR_TOP_LEVEL_IRQS); +static DECLARE_BITMAP(wake_mux_enabled, SUN6I_NR_MUX_BITS); +static DECLARE_BITMAP(wake_mux_valid, SUN6I_NR_MUX_BITS); static void sun6i_r_intc_ack_nmi(void) { @@ -145,6 +156,21 @@ static int sun6i_r_intc_nmi_set_irqchip_state(struct irq_data *data, return irq_chip_set_parent_state(data, which, state); } +static int sun6i_r_intc_irq_set_wake(struct irq_data *data, unsigned int on) +{ + unsigned long offset_from_nmi = data->hwirq - nmi_hwirq; + + if (offset_from_nmi < SUN6I_NR_DIRECT_IRQS) + assign_bit(offset_from_nmi, wake_irq_enabled, on); + else if (test_bit(data->hwirq, wake_mux_valid)) + assign_bit(data->hwirq, wake_mux_enabled, on); + else + /* Not wakeup capable. */ + return -EPERM; + + return 0; +} + static struct irq_chip sun6i_r_intc_nmi_chip = { .name = "sun6i-r-intc", .irq_ack = sun6i_r_intc_nmi_ack, @@ -154,8 +180,19 @@ static struct irq_chip sun6i_r_intc_nmi_chip = { .irq_set_affinity = irq_chip_set_affinity_parent, .irq_set_type = sun6i_r_intc_nmi_set_type, .irq_set_irqchip_state = sun6i_r_intc_nmi_set_irqchip_state, - .flags = IRQCHIP_SET_TYPE_MASKED | - IRQCHIP_SKIP_SET_WAKE, + .irq_set_wake = sun6i_r_intc_irq_set_wake, + .flags = IRQCHIP_SET_TYPE_MASKED, +}; + +static struct irq_chip sun6i_r_intc_wakeup_chip = { + .name = "sun6i-r-intc", + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_affinity = irq_chip_set_affinity_parent, + .irq_set_type = irq_chip_set_type_parent, + .irq_set_wake = sun6i_r_intc_irq_set_wake, + .flags = IRQCHIP_SET_TYPE_MASKED, }; static int sun6i_r_intc_domain_translate(struct irq_domain *domain, @@ -215,8 +252,8 @@ static int sun6i_r_intc_domain_alloc(struct irq_domain *domain, &sun6i_r_intc_nmi_chip, 0); irq_set_handler(virq, handle_fasteoi_ack_irq); } else { - /* Only the NMI is currently supported. */ - return -EINVAL; + irq_domain_set_hwirq_and_chip(domain, virq, hwirq, + &sun6i_r_intc_wakeup_chip, 0); } } @@ -229,6 +266,22 @@ static const struct irq_domain_ops sun6i_r_intc_domain_ops = { .free = irq_domain_free_irqs_common, }; +static int sun6i_r_intc_suspend(void) +{ + u32 buf[BITS_TO_U32(max(SUN6I_NR_TOP_LEVEL_IRQS, SUN6I_NR_MUX_BITS))]; + int i; + + /* Wake IRQs are enabled during system sleep and shutdown. */ + bitmap_to_arr32(buf, wake_irq_enabled, SUN6I_NR_TOP_LEVEL_IRQS); + for (i = 0; i < BITS_TO_U32(SUN6I_NR_TOP_LEVEL_IRQS); ++i) + writel_relaxed(buf[i], base + SUN6I_IRQ_ENABLE(i)); + bitmap_to_arr32(buf, wake_mux_enabled, SUN6I_NR_MUX_BITS); + for (i = 0; i < BITS_TO_U32(SUN6I_NR_MUX_BITS); ++i) + writel_relaxed(buf[i], base + SUN6I_MUX_ENABLE(i)); + + return 0; +} + static void sun6i_r_intc_resume(void) { int i; @@ -239,8 +292,20 @@ static void sun6i_r_intc_resume(void) writel_relaxed(0, base + SUN6I_IRQ_ENABLE(i)); } +static void sun6i_r_intc_shutdown(void) +{ + sun6i_r_intc_suspend(); +} + +static struct syscore_ops sun6i_r_intc_syscore_ops = { + .suspend = sun6i_r_intc_suspend, + .resume = sun6i_r_intc_resume, + .shutdown = sun6i_r_intc_shutdown, +}; + static int __init sun6i_r_intc_init(struct device_node *node, - struct device_node *parent) + struct device_node *parent, + const struct sun6i_r_intc_variant *v) { struct irq_domain *domain, *parent_domain; struct of_phandle_args nmi_parent; @@ -256,6 +321,9 @@ static int __init sun6i_r_intc_init(struct device_node *node, return -EINVAL; nmi_hwirq = nmi_parent.args[1]; + bitmap_set(wake_irq_enabled, v->first_mux_irq, v->nr_mux_irqs); + bitmap_from_arr32(wake_mux_valid, v->mux_valid, SUN6I_NR_MUX_BITS); + parent_domain = irq_find_host(parent); if (!parent_domain) { pr_err("%pOF: Failed to obtain parent domain\n", node); @@ -276,9 +344,36 @@ static int __init sun6i_r_intc_init(struct device_node *node, return -ENOMEM; } + register_syscore_ops(&sun6i_r_intc_syscore_ops); + sun6i_r_intc_ack_nmi(); sun6i_r_intc_resume(); return 0; } -IRQCHIP_DECLARE(sun6i_r_intc, "allwinner,sun6i-a31-r-intc", sun6i_r_intc_init); + +static const struct sun6i_r_intc_variant sun6i_a31_r_intc_variant __initconst = { + .first_mux_irq = 19, + .nr_mux_irqs = 13, + .mux_valid = { 0xffffffff, 0xfff80000, 0xffffffff, 0x0000000f }, +}; + +static int __init sun6i_a31_r_intc_init(struct device_node *node, + struct device_node *parent) +{ + return sun6i_r_intc_init(node, parent, &sun6i_a31_r_intc_variant); +} +IRQCHIP_DECLARE(sun6i_a31_r_intc, "allwinner,sun6i-a31-r-intc", sun6i_a31_r_intc_init); + +static const struct sun6i_r_intc_variant sun50i_h6_r_intc_variant __initconst = { + .first_mux_irq = 21, + .nr_mux_irqs = 16, + .mux_valid = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }, +}; + +static int __init sun50i_h6_r_intc_init(struct device_node *node, + struct device_node *parent) +{ + return sun6i_r_intc_init(node, parent, &sun50i_h6_r_intc_variant); +} +IRQCHIP_DECLARE(sun50i_h6_r_intc, "allwinner,sun50i-h6-r-intc", sun50i_h6_r_intc_init);