linux-kernel - [PATCH v1 23/29] memory: tegra124-emc: Register as interconnect provider

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Message-Id: <20191118200247.3567-24-digetx@gmail.com>
Date:   Mon, 18 Nov 2019 23:02:41 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v1 23/29] memory: tegra124-emc: Register as interconnect provider

EMC now provides MC with memory bandwidth using interconnect API.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/tegra124-emc.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 2c73260654ba..c9478dcbeece 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -25,6 +25,7 @@
 #define EMC_FBIO_CFG5				0x104
 #define	EMC_FBIO_CFG5_DRAM_TYPE_MASK		0x3
 #define	EMC_FBIO_CFG5_DRAM_TYPE_SHIFT		0
+#define EMC_FBIO_CFG5_DRAM_WIDTH_X64		BIT(4)
 
 #define EMC_INTSTATUS				0x0
 #define EMC_INTSTATUS_CLKCHANGE_COMPLETE	BIT(4)
@@ -1080,11 +1081,28 @@ static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)
 		dev_err(dev, "failed to create debugfs entry\n");
 }
 
+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_X64)
+		bus_width = 64;
+	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 platform_device *mc;
 	struct device_node *np;
 	struct tegra_emc *emc;
+	unsigned int bus_width;
 	u32 ram_code;
 	int err;
 
@@ -1146,6 +1164,12 @@ static int tegra_emc_probe(struct platform_device *pdev)
 	if (IS_ENABLED(CONFIG_DEBUG_FS))
 		emc_debugfs_init(&pdev->dev, emc);
 
+	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;
 };
 
-- 
2.23.0