From patchwork Tue Jun 9 13:13:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 11595549 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7735E14E3 for ; Tue, 9 Jun 2020 13:15:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D8BD20774 for ; Tue, 9 Jun 2020 13:15:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gpz1dVmG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729676AbgFINPu (ORCPT ); Tue, 9 Jun 2020 09:15:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728400AbgFINPF (ORCPT ); Tue, 9 Jun 2020 09:15:05 -0400 Received: from mail-lf1-x142.google.com (mail-lf1-x142.google.com [IPv6:2a00:1450:4864:20::142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E359C08C5C7; Tue, 9 Jun 2020 06:15:04 -0700 (PDT) Received: by mail-lf1-x142.google.com with SMTP id 82so12449694lfh.2; Tue, 09 Jun 2020 06:15:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=I7K6pP+VtdggFZCsP3lFDVTttDH/0LC9bYXS86TOH5s=; b=gpz1dVmGBS0JAbbGjI2zfwNKRCHvLrspiNt4fq2GRSzA391Qr0vfeCTsyIRAer/4Ve RoqJunmdCHCAQAA9wAQiT/GqKQexWEMILhCBxSpo5KImBza98KvVbpTbROSO/RgquH97 4H12d9Zdmeh0ybgb4V57JH+9eVjoyGCpU3dxNeBR24H+MZUCGsQasFyrEu6SG1p6EC/r Lf2EQJ3XGzL3c9RdCSw43hN6Nwb7Y6qqSyZ3jABVwF6GRXKyLSR+Z/YmuesJBAha9NDf Nx0E7I4lN8MkNzdkcJEe1vQXLCgxnobtv59F+yJxfWXtP9aMWVxESrCrYHffyPROP/J9 JvlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=I7K6pP+VtdggFZCsP3lFDVTttDH/0LC9bYXS86TOH5s=; b=sm2UnNANBb77lMmYshiVRMOuV2b+FXKJS2O9xRtbhtSYOh4KkKwgFZ74yf5FWryGt7 JiIRnVWz2sjl4ZLZg3CYmgzpdhFgV3mBvg1tv0MZ3UynPdn8JRTtUHG6VBPka/qKCuaZ bP44pu39tMk0Ch732xVcQYfRx+6YDNYUTJ9yci5N9jr77kr2l21ZVCNYeVVh1mWhDyiS L91K2ylMxOvpapCmpnlOgWo7+nX22fe3BKW22zlo8OuPAyy1iYbZUenDt5BfZvzL4qGh Z+zbDA5OlkU7VOoqgK7s0PttoJIeWdOu6+0PqRl1XYLxKtqRmk6eMog77RudHYz6iPNK 3PWQ== X-Gm-Message-State: AOAM533dpaULwMXZkN+N/w7Fln7b0mrzjl1AlOsxNeHUVZLI4B1ZJ6yw 98lUgUUPwjJ9OWl7PTa5Yxs= X-Google-Smtp-Source: ABdhPJwPGbudINukH8h1BPvKKcnsUFOEztbYVGuIQyCRXoLqJ2LoTQ2Y/j1f0h4O68zrJBXYiJqVZg== X-Received: by 2002:a19:ae0f:: with SMTP id f15mr15731902lfc.142.1591708502997; Tue, 09 Jun 2020 06:15:02 -0700 (PDT) Received: from localhost.localdomain (79-139-237-54.dynamic.spd-mgts.ru. [79.139.237.54]) by smtp.gmail.com with ESMTPSA id l22sm4323522lji.120.2020.06.09.06.15.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2020 06:15:02 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Georgi Djakov , Rob Herring , Michael Turquette , Stephen Boyd , Peter De Schrijver , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Mikko Perttunen Cc: =?utf-8?b?QXJ0dXIgxZp3aWdvxYQ=?= , linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org Subject: [PATCH v4 31/37] memory: tegra20-emc: Register as interconnect provider Date: Tue, 9 Jun 2020 16:13:58 +0300 Message-Id: <20200609131404.17523-32-digetx@gmail.com> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200609131404.17523-1-digetx@gmail.com> References: <20200609131404.17523-1-digetx@gmail.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Now memory controller is a memory interconnection provider. This allows us to use interconnect API in order to change memory configuration. Signed-off-by: Dmitry Osipenko --- drivers/memory/tegra/tegra20-emc.c | 110 +++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index 6cd3d50145dc..ef0f5a69f24b 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -148,6 +149,7 @@ struct emc_timing { struct tegra_emc { struct device *dev; struct notifier_block clk_nb; + struct icc_provider provider; struct clk *clk; void __iomem *regs; @@ -661,6 +663,113 @@ static void tegra_emc_debugfs_init(struct tegra_emc *emc) emc, &tegra_emc_debug_max_rate_fops); } +static inline struct tegra_emc * +to_tegra_emc_provider(struct icc_provider *provider) +{ + return container_of(provider, struct tegra_emc, provider); +} + +static struct icc_node * +emc_of_icc_xlate(struct of_phandle_args *spec, void *data) +{ + struct icc_provider *provider = data; + struct icc_node *node; + + /* External Memory is the only possible ICC route */ + list_for_each_entry(node, &provider->nodes, node_list) { + if (node->id == TEGRA_ICC_EMEM) + return node; + } + + return ERR_PTR(-EINVAL); +} + +static int emc_icc_set(struct icc_node *src, struct icc_node *dst) +{ + struct tegra_emc *emc = to_tegra_emc_provider(dst->provider); + unsigned long long rate = icc_units_to_bps(dst->avg_bw); + unsigned int dram_data_bus_width_bytes = 4; + unsigned int ddr = 2; + int err; + + do_div(rate, ddr * dram_data_bus_width_bytes); + rate = min_t(u64, rate, U32_MAX); + + err = clk_set_min_rate(emc->clk, rate); + if (err) + return err; + + err = clk_set_rate(emc->clk, rate); + if (err) + return err; + + return 0; +} + +static int emc_icc_aggregate(struct icc_node *node, + u32 tag, u32 avg_bw, u32 peak_bw, + u32 *agg_avg, u32 *agg_peak) +{ + *agg_avg = min((u64)avg_bw + (*agg_avg), (u64)U32_MAX); + *agg_peak = max(*agg_peak, peak_bw); + + return 0; +} + +static int tegra_emc_interconnect_init(struct tegra_emc *emc) +{ + struct icc_node *node; + int err; + + /* older device-trees don't have interconnect properties */ + if (!of_find_property(emc->dev->of_node, "#interconnect-cells", NULL)) + return 0; + + emc->provider.dev = emc->dev; + emc->provider.set = emc_icc_set; + emc->provider.data = &emc->provider; + emc->provider.xlate = emc_of_icc_xlate; + emc->provider.aggregate = emc_icc_aggregate; + + err = icc_provider_add(&emc->provider); + if (err) + goto err_msg; + + /* create External Memory Controller node */ + node = icc_node_create(TEGRA_ICC_EMC); + err = PTR_ERR_OR_ZERO(node); + if (err) + goto del_provider; + + node->name = "External Memory Controller"; + icc_node_add(node, &emc->provider); + + /* link External Memory Controller to External Memory (DRAM) */ + err = icc_link_create(node, TEGRA_ICC_EMEM); + if (err) + goto remove_nodes; + + /* create External Memory node */ + node = icc_node_create(TEGRA_ICC_EMEM); + err = PTR_ERR_OR_ZERO(node); + if (err) + goto remove_nodes; + + node->name = "External Memory (DRAM)"; + icc_node_add(node, &emc->provider); + + return 0; + +remove_nodes: + icc_nodes_remove(&emc->provider); +del_provider: + icc_provider_del(&emc->provider); +err_msg: + dev_err(emc->dev, "failed to initialize ICC: %d\n", err); + + return err; +} + static int tegra_emc_init_mc_timings(struct tegra_emc *emc) { struct tegra_mc_timing *timing; @@ -766,6 +875,7 @@ static int tegra_emc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, emc); tegra_emc_debugfs_init(emc); + tegra_emc_interconnect_init(emc); /* * Don't allow the kernel module to be unloaded. Unloading adds some