From patchwork Mon Nov 30 03:40:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tzung-Bi Shih X-Patchwork-Id: 11939679 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 C85E4C63777 for ; Mon, 30 Nov 2020 03:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 737DC206F9 for ; Mon, 30 Nov 2020 03:41:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="XXL3FNIC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726988AbgK3Dlo (ORCPT ); Sun, 29 Nov 2020 22:41:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726000AbgK3Dln (ORCPT ); Sun, 29 Nov 2020 22:41:43 -0500 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70AB9C0613D2 for ; Sun, 29 Nov 2020 19:41:03 -0800 (PST) Received: by mail-qv1-xf49.google.com with SMTP id b9so6507615qvj.6 for ; Sun, 29 Nov 2020 19:41:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:message-id:mime-version:subject:from:to:cc; bh=t4fLql8tHd4V6/duVaePgm5PJmh4ozJmqo/1RhL4xGg=; b=XXL3FNICF2bqY+E2EHD6AsEA4IYfCpwH3ahZ+bN6j+oa6zGAlbkOYcdp307p3GUqrI 7gNpgG673E83FtFtvXipraoEZNZ/4bdne+USRpbH8E1fS3zhZ4BePyvk+S8WVH89KADo TDIKsLoCtBW5ZlWvGshTag+LpzJaseYKVQl67W34dDckd5Z/ZoICEED4bDas/IahxiXG P3BQ5X1+TbxcPBBqv8bSvFL6Wyp+brzu42SSu9f0qS7mXOxS+Qtg7L1Ug3A4vx7qTHNF qGvHirvpMYGyOON8PbVmACrtwj7BK6IT8mj/M9r9rr+NaJQUeWWtK1BC0nAJpGkSz/2F xdMw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:message-id:mime-version:subject:from :to:cc; bh=t4fLql8tHd4V6/duVaePgm5PJmh4ozJmqo/1RhL4xGg=; b=apVzwV3nhy+7FRLklXKOJhz6I7UkGF4YytYQfsrljyEECPx22wQFuB+65xwgpsqvq5 91C7ujphQmNqRGXT4cF8t7b7uacKiZJCagLSfJL/TsC7+wXY5NnTen5xLlasMJoKc0kM otS4UTWHYZRXIGiNcGbK6vN3gycSaUK3HqfkBT5Zt1oMbrcSlKytpZv9zNg3KqCnUOkU Yw2TePNHuIc4V6wOAadPm2DQtsilgAqNapWzIAayHz36MnqUQmoi/aYc5qyyO+0S24op gvFks9iQMrTmooBksWVKMQD+QDWDbCeg+Ew8iEbgsA9dMBgmdrnBuZuW8GAgvf4wre4F nY0w== X-Gm-Message-State: AOAM530GURzD/jL9P6aguaECa6Hca3Xcqli3Se+u96obKzlDs4auRsmt QaGF6Sp+EcLdjqEBa3FjxuzHJvJTjRrD X-Google-Smtp-Source: ABdhPJzvyraEkqM9bHTK1/LSmVjZLGK8+8tAtjJxn6YprL1w9Tg9R3zqfenk+hqQYXecu1mOIE6E2Znj5K3Q Sender: "tzungbi via sendgmr" X-Received: from tzungbi-z840.tpe.corp.google.com ([2401:fa00:1:b:725a:fff:fe41:c6a5]) (user=tzungbi job=sendgmr) by 2002:a05:6214:190f:: with SMTP id er15mr18369153qvb.33.1606707662553; Sun, 29 Nov 2020 19:41:02 -0800 (PST) Date: Mon, 30 Nov 2020 11:40:25 +0800 Message-Id: <20201130034025.3232229-1-tzungbi@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v3] remoteproc/mediatek: read IPI buffer offset from FW From: Tzung-Bi Shih To: ohad@wizery.com, bjorn.andersson@linaro.org Cc: linux-remoteproc@vger.kernel.org, matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, pihsun@chromium.org, mathieu.poirier@linaro.org, tzungbi@google.com, erin.lo@mediatek.com Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Reads the IPI buffer offset from the FW binary. The information resides in addr of .ipi_buffer section. Moves scp_ipi_init() to scp_load() phase. The IPI buffer can be initialized only if the offset is clear. To backward compatible to MT8183 SCP, specify the offset in the board specific mtk_scp_of_data. Reads the default offset if the firmware doesn't have it. Signed-off-by: Tzung-Bi Shih --- Previous discussion: https://patchwork.kernel.org/project/linux-remoteproc/patch/20201127092941.1646260-1-tzungbi@google.com/ Changes from v2: - to backward-compatible, reads the default offset if the firmware doesn't have it drivers/remoteproc/mtk_common.h | 2 + drivers/remoteproc/mtk_scp.c | 79 +++++++++++++++++++++++---------- 2 files changed, 57 insertions(+), 24 deletions(-) diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h index b3397d327786..5169ddce2dc7 100644 --- a/drivers/remoteproc/mtk_common.h +++ b/drivers/remoteproc/mtk_common.h @@ -78,6 +78,8 @@ struct mtk_scp_of_data { u32 host_to_scp_reg; u32 host_to_scp_int_bit; + + size_t ipi_buf_offset; }; struct mtk_scp { diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c index 5f42b9ce7185..5392c2fff682 100644 --- a/drivers/remoteproc/mtk_scp.c +++ b/drivers/remoteproc/mtk_scp.c @@ -21,7 +21,7 @@ #include "remoteproc_internal.h" #define MAX_CODE_SIZE 0x500000 -#define SCP_FW_END 0x7C000 +#define SECTION_NAME_IPI_BUFFER ".ipi_buffer" /** * scp_get() - get a reference to SCP. @@ -119,16 +119,29 @@ static void scp_ipi_handler(struct mtk_scp *scp) wake_up(&scp->ack_wq); } -static int scp_ipi_init(struct mtk_scp *scp) +static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp, + const struct firmware *fw, + size_t *offset); + +static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw) { - size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj); - size_t recv_offset = send_offset - sizeof(struct mtk_share_obj); + int ret; + size_t offset; + + /* read the ipi buf addr from FW itself first */ + ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset); + if (ret) { + /* use default ipi buf addr if the FW doesn't have it */ + offset = scp->data->ipi_buf_offset; + if (!offset) + return ret; + } + dev_info(scp->dev, "IPI buf addr %#010zx\n", offset); - /* shared buffer initialization */ - scp->recv_buf = - (struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset); - scp->send_buf = - (struct mtk_share_obj __iomem *)(scp->sram_base + send_offset); + scp->recv_buf = (struct mtk_share_obj __iomem *) + (scp->sram_base + offset); + scp->send_buf = (struct mtk_share_obj __iomem *) + (scp->sram_base + offset + sizeof(*scp->recv_buf)); memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf)); memset_io(scp->send_buf, 0, sizeof(*scp->send_buf)); @@ -271,6 +284,32 @@ static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw) return ret; } +static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp, + const struct firmware *fw, + size_t *offset) +{ + struct elf32_hdr *ehdr; + struct elf32_shdr *shdr, *shdr_strtab; + int i; + const u8 *elf_data = fw->data; + const char *strtab; + + ehdr = (struct elf32_hdr *)elf_data; + shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); + shdr_strtab = shdr + ehdr->e_shstrndx; + strtab = (const char *)(elf_data + shdr_strtab->sh_offset); + + for (i = 0; i < ehdr->e_shnum; i++, shdr++) { + if (strcmp(strtab + shdr->sh_name, + SECTION_NAME_IPI_BUFFER) == 0) { + *offset = shdr->sh_addr; + return 0; + } + } + + return -ENOENT; +} + static int mt8183_scp_before_load(struct mtk_scp *scp) { /* Clear SCP to host interrupt */ @@ -350,11 +389,15 @@ static int scp_load(struct rproc *rproc, const struct firmware *fw) ret = scp->data->scp_before_load(scp); if (ret < 0) - return ret; + goto leave; ret = scp_elf_load_segments(rproc, fw); - clk_disable_unprepare(scp->clk); + if (ret) + goto leave; + ret = scp_ipi_init(scp, fw); +leave: + clk_disable_unprepare(scp->clk); return ret; } @@ -680,19 +723,6 @@ static int scp_probe(struct platform_device *pdev) goto release_dev_mem; } - ret = clk_prepare_enable(scp->clk); - if (ret) { - dev_err(dev, "failed to enable clocks\n"); - goto release_dev_mem; - } - - ret = scp_ipi_init(scp); - clk_disable_unprepare(scp->clk); - if (ret) { - dev_err(dev, "Failed to init ipi\n"); - goto release_dev_mem; - } - /* register SCP initialization IPI */ ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp); if (ret) { @@ -760,6 +790,7 @@ static const struct mtk_scp_of_data mt8183_of_data = { .scp_stop = mt8183_scp_stop, .host_to_scp_reg = MT8183_HOST_TO_SCP, .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT, + .ipi_buf_offset = 0x7bdb0, }; static const struct mtk_scp_of_data mt8192_of_data = {