From patchwork Thu May 23 08:02:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Schneider-Pargmann X-Patchwork-Id: 13671378 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 53F78C25B79 for ; Thu, 23 May 2024 08:03:04 +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=7U4yF9q3YFHEBqJpXP+jul90ibPdzjwh9eLNswDtKrg=; b=zBU2TF6cqh9Pa9 gKmHCQ3RdiAPsfNzs0fl620fW3eR49x+lQkINBGtKFipjfN8QaUDrUN5t10vyR3Dc/YZ9q1bIw1nk bcHMG1Fk2GJIfD9OEAXDhDOw8TRG/LtlFKUTO4bF28msMNeMwHWU+v/79R+o4yEN5Fr+mYnAOZZWp CsLym4LBYmarkSfsA4B0DaD9ywHd9/YiGkDBqB0zWKDqetipBQMwrGt+hEPghKyg7braltUMMXj6i iShVKtoOtY40VNzwmLse/1FvNmR5BdY/IcbDV32F8A4Gt36dE6YZpD/cH0TuL2Dix7+6KZQ9kX0sE eiHn107z7z8LtuzcqAcQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sA3PO-00000005Q9b-1Gom; Thu, 23 May 2024 08:02:42 +0000 Received: from mail-wr1-x430.google.com ([2a00:1450:4864:20::430]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sA3PH-00000005Q6D-0GZ5 for linux-arm-kernel@lists.infradead.org; Thu, 23 May 2024 08:02:36 +0000 Received: by mail-wr1-x430.google.com with SMTP id ffacd0b85a97d-352129e3c8eso5052153f8f.2 for ; Thu, 23 May 2024 01:02:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1716451353; x=1717056153; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=CKfwfIlswqj+NeWyOeSXupSHhvK+FlBEhFYxTgaPgZg=; b=QH0do6EF0tJMzC9nvWCadd4fofoes4K53u9o9V0PrhQ6KW+8MlfqHy2n3TbyBRvMmR hlVxY77sncsKMMxYIoLktrHKRiSN7GMbV6X+vJJP9a6vee/uBI7sgXR2y3MbjRkTv1KC aCmMzepBVfzcTxEuc6eTU8RndeZMEQ/Qh7PAJ5F9IFp89WACck28qU2UUlMPMCXtwXvH 4jJobCDhodiFno0eguL3CvNKfCro4IIisfgupSPoxaX01Ibjjd2rXpsfB+wFtd9v+Bhc vwLnLAzsDcnLhNyfIdAJ87/fsdCYsGe5eUTQIUzsZ4ldlup1dufU/rxaupGaah2+PxFS bUOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716451353; x=1717056153; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=CKfwfIlswqj+NeWyOeSXupSHhvK+FlBEhFYxTgaPgZg=; b=TcoJMdDwGIbl1HtWOKFo/Kzqe5cpdYVHfBuB/QlB4vwuTRdSArqBR9L1BW0PObvxuL VVcsO65BJfPhGe3NUk9QIznFKf3sF43olI31rddQ3N0zcXl0C8KYSKlszbWpjNOMyI55 CX6JCUil8J6uE+XjRfjwRdGT/GGpjXGepo5BNMwrTsOFQdzSxSLU2ZBi64diKYPE6u61 HSqisW43ddoH8cRZ23V1EM8ZDKI8xqbMsuKAG59cj6zkROcgYM2+Rt98M8AXRXU4Fdym r7hNHMYixEFcokSXfkrLzgF14ocAkhhgAzlL3gHrrYEMvuAzGHS/BW3QQOSQaCu0J3g1 SNJw== X-Forwarded-Encrypted: i=1; AJvYcCXKYvl/OFk3jlwVCm4GGJLqiXfAeEgumuRJ/PAf7ME4Th1XSroTJs8CD0C9rrhumlOAjhVIR5yXapz5GcviruSrldscQHQ7me8xAiraLUUN8gFVvnA= X-Gm-Message-State: AOJu0YyN6YS3yVKqFMVjDD0jaiT8drLNP8zRrpU0cTmHCHiNjinQzC8a lLf/Q+5GrqlTE1nofUoZRYtvS3d+kZVaD2oZQ4YflwZcEHuik97qefh2DOwBaiw= X-Google-Smtp-Source: AGHT+IEiGPP2k0Tes52yuipZMzp/g7mrJRY1V/fQrwHdTe2JA41WKN+HYayFlOJdmGCEyJZnrhwD6Q== X-Received: by 2002:a5d:4007:0:b0:354:e72f:d5d7 with SMTP id ffacd0b85a97d-354e72fd6f3mr2266834f8f.24.1716451353123; Thu, 23 May 2024 01:02:33 -0700 (PDT) Received: from blmsp.fritz.box ([2001:4091:a246:821e:6f3b:6b50:4762:8343]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-35501abfdddsm93637f8f.110.2024.05.23.01.02.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 May 2024 01:02:31 -0700 (PDT) From: Markus Schneider-Pargmann To: Nishanth Menon , Tero Kristo , Santosh Shilimkar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vignesh Raghavendra Cc: Vibhore Vardhan , Kevin Hilman , Dhruva Gole , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Markus Schneider-Pargmann Subject: [PATCH 2/6] firmware: ti_sci: Partial-IO support Date: Thu, 23 May 2024 10:02:21 +0200 Message-ID: <20240523080225.1288617-3-msp@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240523080225.1288617-1-msp@baylibre.com> References: <20240523080225.1288617-1-msp@baylibre.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240523_010235_131782_1C2FA4C4 X-CRM114-Status: GOOD ( 27.13 ) 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 Add support for Partial-IO poweroff. In Partial-IO pins of a few modules can generate system wakeups while DDR memory is not powered resulting in a fresh boot of the system. The modules that can be wakeup sources are defined by the devicetree. Only wakeup sources that are actually enabled by the user will be considered as a an active wakeup source. If none of the wakeup sources are enabled the system will do a normal poweroff. If at least one wakeup source is enabled it will instead send a TI_SCI_MSG_PREPARE_SLEEP message from the sys_off handler. Sending this message will result in an immediate shutdown of the system. No execution is expected after this point. The code will enter an infinite loop. The wakeup source device nodes are gathered during probe. But they are only resolved to the actual devices in the sys_off handler, if they exist. If they do not exist, they are ignored. Signed-off-by: Markus Schneider-Pargmann --- drivers/firmware/ti_sci.c | 135 +++++++++++++++++++++++++++++++++++++- drivers/firmware/ti_sci.h | 31 +++++++++ 2 files changed, 165 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index 160968301b1f..04730c4df2de 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -116,6 +116,9 @@ struct ti_sci_info { u8 host_id; /* protected by ti_sci_list_mutex */ int users; + + int nr_wakeup_sources; + struct device_node **wakeup_source_nodes; }; #define cl_to_ti_sci_info(c) container_of(c, struct ti_sci_info, cl) @@ -380,6 +383,28 @@ static void ti_sci_put_one_xfer(struct ti_sci_xfers_info *minfo, up(&minfo->sem_xfer_count); } +/** + * ti_sci_do_send() - Do one send, do not expect a response + * @info: Pointer to SCI entity information + * @xfer: Transfer to initiate + * + * Return: If send error, return corresponding error, else + * if all goes well, return 0. + */ +static inline int ti_sci_do_send(struct ti_sci_info *info, + struct ti_sci_xfer *xfer) +{ + int ret; + + ret = mbox_send_message(info->chan_tx, &xfer->tx_message); + if (ret < 0) + return ret; + + mbox_client_txdone(info->chan_tx, ret); + + return 0; +} + /** * ti_sci_do_xfer() - Do one transfer * @info: Pointer to SCI entity information @@ -3262,6 +3287,79 @@ static int tisci_reboot_handler(struct sys_off_data *data) return NOTIFY_BAD; } +/* Does not return if successful */ +static int tisci_enter_partial_io(struct ti_sci_info *info) +{ + struct ti_sci_msg_req_prepare_sleep *req; + struct ti_sci_xfer *xfer; + struct device *dev = info->dev; + int ret = 0; + + xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PREPARE_SLEEP, + TI_SCI_FLAG_REQ_GENERIC_NORESPONSE, + sizeof(*req), sizeof(struct ti_sci_msg_hdr)); + if (IS_ERR(xfer)) { + ret = PTR_ERR(xfer); + dev_err(dev, "Message alloc failed(%d)\n", ret); + return ret; + } + + req = (struct ti_sci_msg_req_prepare_sleep *)xfer->xfer_buf; + req->mode = TISCI_MSG_VALUE_SLEEP_MODE_PARTIAL_IO; + req->ctx_lo = 0; + req->ctx_hi = 0; + req->debug_flags = 0; + + ret = ti_sci_do_send(info, xfer); + if (ret) { + dev_err(dev, "Mbox send fail %d\n", ret); + goto fail; + } + +fail: + ti_sci_put_one_xfer(&info->minfo, xfer); + + return ret; +} + +static int tisci_sys_off_handler(struct sys_off_data *data) +{ + struct ti_sci_info *info = data->cb_data; + int i; + int ret; + bool enter_partial_io = false; + + for (i = 0; i != info->nr_wakeup_sources; ++i) { + struct platform_device *pdev = + of_find_device_by_node(info->wakeup_source_nodes[i]); + + if (!pdev) + continue; + + if (device_may_wakeup(&pdev->dev)) { + dev_dbg(info->dev, "%pOFp identified as wakeup source\n", + info->wakeup_source_nodes[i]); + enter_partial_io = true; + } + } + + if (!enter_partial_io) + return NOTIFY_DONE; + + ret = tisci_enter_partial_io(info); + + if (ret) + dev_err(info->dev, + "Failed to enter Partial-IO %pe, halting system\n", + ERR_PTR(ret)); + + /* Halt system/code execution */ + while (1) + ; + + return NOTIFY_DONE; +} + /* Description for K2G */ static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = { .default_host_id = 2, @@ -3398,6 +3496,35 @@ static int ti_sci_probe(struct platform_device *pdev) goto out; } + if (of_property_read_bool(dev->of_node, "ti,partial-io-wakeup-sources")) { + info->nr_wakeup_sources = + of_count_phandle_with_args(dev->of_node, + "ti,partial-io-wakeup-sources", + NULL); + info->wakeup_source_nodes = + devm_kzalloc(dev, sizeof(*info->wakeup_source_nodes), + GFP_KERNEL); + + for (i = 0; i != info->nr_wakeup_sources; ++i) { + struct device_node *devnode = + of_parse_phandle(dev->of_node, + "ti,partial-io-wakeup-sources", + i); + info->wakeup_source_nodes[i] = devnode; + } + + ret = devm_register_sys_off_handler(dev, + SYS_OFF_MODE_POWER_OFF, + SYS_OFF_PRIO_FIRMWARE, + tisci_sys_off_handler, + info); + if (ret) { + dev_err(dev, "Failed to register sys_off_handler %pe\n", + ERR_PTR(ret)); + goto out; + } + } + dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n", info->handle.version.abi_major, info->handle.version.abi_minor, info->handle.version.firmware_revision, @@ -3407,7 +3534,13 @@ static int ti_sci_probe(struct platform_device *pdev) list_add_tail(&info->node, &ti_sci_list); mutex_unlock(&ti_sci_list_mutex); - return of_platform_populate(dev->of_node, NULL, NULL, dev); + ret = of_platform_populate(dev->of_node, NULL, NULL, dev); + if (ret) { + dev_err(dev, "platform_populate failed %pe\n", ERR_PTR(ret)); + goto out; + } + return 0; + out: if (!IS_ERR(info->chan_tx)) mbox_free_channel(info->chan_tx); diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h index ef3a8214d002..6d8b12341f68 100644 --- a/drivers/firmware/ti_sci.h +++ b/drivers/firmware/ti_sci.h @@ -35,6 +35,9 @@ #define TI_SCI_MSG_QUERY_CLOCK_FREQ 0x010d #define TI_SCI_MSG_GET_CLOCK_FREQ 0x010e +/* Low Power Mode Requests */ +#define TI_SCI_MSG_PREPARE_SLEEP 0x0300 + /* Resource Management Requests */ #define TI_SCI_MSG_GET_RESOURCE_RANGE 0x1500 @@ -545,6 +548,34 @@ struct ti_sci_msg_resp_get_clock_freq { u64 freq_hz; } __packed; +#define TISCI_MSG_VALUE_SLEEP_MODE_DEEP_SLEEP 0x0 +#define TISCI_MSG_VALUE_SLEEP_MODE_MCU_ONLY 0x1 +#define TISCI_MSG_VALUE_SLEEP_MODE_STANDBY 0x2 +#define TISCI_MSG_VALUE_SLEEP_MODE_PARTIAL_IO 0x3 + +/** + * struct tisci_msg_prepare_sleep_req - Request for TISCI_MSG_PREPARE_SLEEP. + * + * @hdr TISCI header to provide ACK/NAK flags to the host. + * @mode Low power mode to enter. + * @ctx_lo Low 32-bits of physical pointer to address to use for context save. + * @ctx_hi High 32-bits of physical pointer to address to use for context save. + * @debug_flags Flags that can be set to halt the sequence during suspend or + * resume to allow JTAG connection and debug. + * + * This message is used as the first step of entering a low power mode. It + * allows configurable information, including which state to enter to be + * easily shared from the application, as this is a non-secure message and + * therefore can be sent by anyone. + */ +struct ti_sci_msg_req_prepare_sleep { + struct ti_sci_msg_hdr hdr; + u8 mode; + u32 ctx_lo; + u32 ctx_hi; + u32 debug_flags; +} __packed; + #define TI_SCI_IRQ_SECONDARY_HOST_INVALID 0xff /**