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[79.139.233.37]) by smtp.gmail.com with ESMTPSA id j23sm9166942lji.41.2019.11.18.12.05.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2019 12:05:49 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Peter De Schrijver , Mikko Perttunen , Georgi Djakov , Rob Herring Cc: 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 v1 19/29] memory: tegra20-emc: Register as interconnect provider Date: Mon, 18 Nov 2019 23:02:37 +0300 Message-Id: <20191118200247.3567-20-digetx@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191118200247.3567-1-digetx@gmail.com> References: <20191118200247.3567-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org EMC now provides MC with memory bandwidth using interconnect API. Signed-off-by: Dmitry Osipenko --- drivers/memory/tegra/tegra20-emc.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index 28bd9fd4c3c9..61ce422e102a 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -19,6 +19,7 @@ #include #include +#include #define EMC_INTSTATUS 0x000 #define EMC_INTMASK 0x004 @@ -87,6 +88,8 @@ #define EMC_DBG_READ_DQM_CTRL BIT(9) #define EMC_DBG_CFG_PRIORITY BIT(24) +#define EMC_FBIO_CFG5_DRAM_WIDTH_X16 BIT(4) + static const u16 emc_timing_registers[] = { EMC_RC, EMC_RFC, @@ -486,10 +489,27 @@ static long emc_round_rate(unsigned long rate, return timing->rate; } +static unsigned int emc_dram_data_bus_width_bytes(struct tegra_emc *emc) +{ + unsigned int bus_width; + u32 emc_cfg; + + emc_cfg = readl_relaxed(emc->regs + EMC_FBIO_CFG5); + if (emc_cfg & EMC_FBIO_CFG5_DRAM_WIDTH_X16) + bus_width = 16; + else + bus_width = 32; + + dev_info(emc->dev, "DRAM data-bus width: %ubit\n", bus_width); + + return bus_width / 8; +} + static int tegra_emc_probe(struct platform_device *pdev) { struct device_node *np; struct tegra_emc *emc; + unsigned int bus_width; int irq, err; emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL); @@ -549,6 +569,12 @@ static int tegra_emc_probe(struct platform_device *pdev) goto unset_cb; } + bus_width = emc_dram_data_bus_width_bytes(emc); + + err = tegra_icc_emc_setup_interconnect(&pdev->dev, bus_width); + if (err) + dev_err(&pdev->dev, "failed to initialize ICC: %d\n", err); + return 0; unset_cb: -- 2.23.0