From patchwork Thu Aug 3 06:42:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dhruva Gole X-Patchwork-Id: 710131 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 32778C001E0 for ; Thu, 3 Aug 2023 06:43:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233613AbjHCGnp (ORCPT ); Thu, 3 Aug 2023 02:43:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233450AbjHCGna (ORCPT ); Thu, 3 Aug 2023 02:43:30 -0400 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14420E4C; Wed, 2 Aug 2023 23:43:27 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 3736hKQ6086213; Thu, 3 Aug 2023 01:43:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1691045000; bh=+Nt8N4FdlpW6zHdknZQDoVv5/uuY5PiCrspbl4rKheY=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=HS+r+lTu+ucDCMdzo3G969H+HOEUiCM6yig8fg1NT9AgNqp/8YVBMp4lt9NZGQwaG AEd+IjoQeU1Idcost5randRak1slOfL+vaR3vUu0hGEqD8cZtaBQyK7/Ong7AcWtiz etMHILyyGcL4JHBzBAS/xatLpqJtb00YdP/us3OE= Received: from DLEE106.ent.ti.com (dlee106.ent.ti.com [157.170.170.36]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 3736hJA8031125 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 3 Aug 2023 01:43:19 -0500 Received: from DLEE110.ent.ti.com (157.170.170.21) by DLEE106.ent.ti.com (157.170.170.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Thu, 3 Aug 2023 01:43:19 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE110.ent.ti.com (157.170.170.21) 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; Thu, 3 Aug 2023 01:43:19 -0500 Received: from localhost (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 3736hIG7033135; Thu, 3 Aug 2023 01:43:19 -0500 From: Dhruva Gole To: Nishanth Menon , Tero Kristo , "Santosh Shilimkar" CC: , , , Viresh Kumar , "Praneeth Bajjuri" , Tony Lindgren , Dave Gerlach , Vibhore Vardhan , Georgi Vlaev , Roger Quadros , Dhruva Gole Subject: [PATCH V6 3/4] firmware: ti_sci: Allocate memory for Low Power Modes Date: Thu, 3 Aug 2023 12:12:46 +0530 Message-ID: <20230803064247.503036-4-d-gole@ti.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230803064247.503036-1-d-gole@ti.com> References: <20230803064247.503036-1-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 | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c index 3b40f9336b3f..0334ade19868 100644 --- a/drivers/firmware/ti_sci.c +++ b/drivers/firmware/ti_sci.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -25,6 +26,9 @@ #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 */ @@ -96,6 +100,9 @@ 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 { @@ -113,6 +120,9 @@ 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; }; @@ -3511,6 +3521,25 @@ 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, @@ -3661,6 +3690,15 @@ 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, @@ -3708,6 +3746,10 @@ static int ti_sci_remove(struct platform_device *pdev) mbox_free_channel(info->chan_rx); } + if (info->ctx_mem_buf) + dma_free_coherent(info->dev, LPM_CTX_MEM_SIZE, + info->ctx_mem_buf, + info->ctx_mem_addr); return ret; }