From patchwork Fri Aug 4 11:50:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dhruva Gole X-Patchwork-Id: 710782 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68371C001DF for ; Fri, 4 Aug 2023 11:52:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230217AbjHDLwk (ORCPT ); Fri, 4 Aug 2023 07:52:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229445AbjHDLwj (ORCPT ); Fri, 4 Aug 2023 07:52:39 -0400 Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C50ED127; Fri, 4 Aug 2023 04:52:37 -0700 (PDT) Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 374BqWwM020848; Fri, 4 Aug 2023 06:52:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1691149952; bh=TqKxNIGJnt5+2bHiWBaedpD7/IwhNmC4TbxjiKwgcZ8=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=RrxMsnGjiqivgz5xnJR/bKm7noasx2Eoik02LhdcozNRGZ0uT9MihxaohQw8lx4vp w5DA5hZoZ4tXmsXinwldui5MlQyCrs2ZqxBJpahQPeVUBc3nFTe2SU1+ac3RGVIold SCnbXlCTQrlwmYyyz1aex42WKX824/Kixvmkll9M= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 374BqWDN123642 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 4 Aug 2023 06:52:32 -0500 Received: from DFLE111.ent.ti.com (10.64.6.32) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Fri, 4 Aug 2023 06:52:31 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE111.ent.ti.com (10.64.6.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Fri, 4 Aug 2023 06:52:30 -0500 Received: from localhost (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 374BqUpJ023849; Fri, 4 Aug 2023 06:52:30 -0500 From: Dhruva Gole To: Nishanth Menon , Tero Kristo , "Santosh Shilimkar" CC: , , , , "Kevin Hilman" , Vignesh R , Dave Gerlach , Vibhore Vardhan , Georgi Vlaev , Roger Quadros , Dhruva Gole Subject: [PATCH V7 3/4] firmware: ti_sci: Allocate memory for Low Power Modes Date: Fri, 4 Aug 2023 17:20:36 +0530 Message-ID: <20230804115037.754994-4-d-gole@ti.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230804115037.754994-1-d-gole@ti.com> References: <20230804115037.754994-1-d-gole@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Dave Gerlach A region of memory in DDR must be used during Deep Sleep for saving of some system context when using the ti_sci firmware. From DM's point of view, this can be any contiguous region in the DDR, so can allocate 512KB of DMA reserved memory in probe(), instead of another carveout. Also send a TISCI_MSG_QUERY_FW_CAPS message to the firmware during probe to determine if any low power modes are supported and if ti_sci_init_suspend should be called based on the response received. Signed-off-by: Dave Gerlach Signed-off-by: Vibhore Vardhan Signed-off-by: Georgi Vlaev Tested-by: Roger Quadros [d-gole@ti.com: Use dma_alloc_attrs instead of dma_alloc_coherent] Signed-off-by: Dhruva Gole --- drivers/firmware/ti_sci.c | 44 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index ac64e328c313..512338699153 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -26,6 +27,9 @@ #include "ti_sci.h" +/* Low power mode memory context size */ +#define LPM_CTX_MEM_SIZE 0x80000 + /* List of all TI SCI devices active in system */ static LIST_HEAD(ti_sci_list); /* Protection for the entire list */ @@ -97,6 +101,9 @@ struct ti_sci_desc { * @minfo: Message info * @node: list head * @host_id: Host ID + * @ctx_mem_addr: Low power context memory phys address + * @ctx_mem_buf: Low power context memory buffer + * @fw_caps: FW/SoC low power capabilities * @users: Number of users of this instance */ struct ti_sci_info { @@ -114,6 +121,9 @@ struct ti_sci_info { struct ti_sci_xfers_info minfo; struct list_head node; u8 host_id; + dma_addr_t ctx_mem_addr; + void *ctx_mem_buf; + u64 fw_caps; /* protected by ti_sci_list_mutex */ int users; }; @@ -3423,6 +3433,25 @@ static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode, return NOTIFY_BAD; } +static int ti_sci_init_suspend(struct platform_device *pdev, + struct ti_sci_info *info) +{ + struct device *dev = &pdev->dev; + + dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); + info->ctx_mem_buf = dma_alloc_attrs(info->dev, LPM_CTX_MEM_SIZE, + &info->ctx_mem_addr, + GFP_KERNEL, + DMA_ATTR_NO_KERNEL_MAPPING | + DMA_ATTR_FORCE_CONTIGUOUS); + if (!info->ctx_mem_buf) { + dev_err(info->dev, "Failed to allocate LPM context memory\n"); + return -ENOMEM; + } + + return 0; +} + /* Description for K2G */ static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = { .default_host_id = 2, @@ -3573,6 +3602,15 @@ static int ti_sci_probe(struct platform_device *pdev) } } + /* + * Check if the firmware supports any optional low power modes + * and initialize them if present. Old revisions of TIFS (< 08.04) + * will NACK the request. + */ + ret = ti_sci_msg_cmd_query_fw_caps(&info->handle, &info->fw_caps); + if (!ret && (info->fw_caps & MSG_MASK_CAPS_LPM)) + ti_sci_init_suspend(pdev, info); + 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, @@ -3620,6 +3658,12 @@ static int ti_sci_remove(struct platform_device *pdev) mbox_free_channel(info->chan_rx); } + if (info->ctx_mem_buf) + dma_free_attrs(info->dev, LPM_CTX_MEM_SIZE, + info->ctx_mem_buf, + info->ctx_mem_addr, + DMA_ATTR_NO_KERNEL_MAPPING | + DMA_ATTR_FORCE_CONTIGUOUS); return ret; }