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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: f.fainelli@gmail.com, arnd@arndb.de, narmstrong@baylibre.com,
	dwmw2@infradead.org, linux@armlinux.org.uk, hch@infradead.org,
	will@kernel.org, robh+dt@kernel.org, catalin.marinas@arm.com,
	robin.murphy@arm.com, ardb@kernel.org,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [RFC 03/13] of: device: Introduce of_mmio_configure()
Date: Fri, 26 Feb 2021 15:02:55 +0100
Message-ID: <20210226140305.26356-4-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20210226140305.26356-1-nsaenzjulienne@suse.de>

The function will traverse a device's bus hierarchy looking for MMIO
limited buses. If found it'll populate the relevant struct device
quirks.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/of/device.c       | 19 +++++++++++++++++++
 include/linux/of_device.h |  8 ++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 6cb86de404f1..b80367a2764b 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -169,6 +169,25 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_dma_configure_id);
 
+int of_mmio_configure(struct device *dev, struct device_node *np)
+{
+#if defined(CONFIG_ARCH_HAS_64BIT_MMIO_BROKEN)
+	struct device_node *node = of_node_get(np);
+
+	do {
+		if (of_property_read_bool(node, "64bit-mmio-broken")) {
+			dev->mmio_64bit_broken = true;
+			dev_dbg(dev, "device behind 64bit mmio broken bus\n");
+			break;
+		}
+	} while ((node = of_get_next_parent(node)));
+
+	of_node_put(node);
+#endif
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_mmio_configure);
+
 int of_device_register(struct platform_device *pdev)
 {
 	device_initialize(&pdev->dev);
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index 1d7992a02e36..c465edd509c7 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -56,6 +56,9 @@ static inline int of_dma_configure(struct device *dev,
 {
 	return of_dma_configure_id(dev, np, force_dma, NULL);
 }
+
+int of_mmio_configure(struct device *dev, struct device_node *np);
+
 #else /* CONFIG_OF */
 
 static inline int of_driver_match_device(struct device *dev,
@@ -112,6 +115,11 @@ static inline int of_dma_configure(struct device *dev,
 {
 	return 0;
 }
+
+static inline int of_mmio_configure(struct device *dev, struct device_node *np);
+{
+	return 0;
+}
 #endif /* CONFIG_OF */
 
 #endif /* _LINUX_OF_DEVICE_H */
-- 
2.30.1


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Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26 14:02 [RFC 00/13] Generic way of dealing with broken 64-bit buses Nicolas Saenz Julienne
2021-02-26 14:02 ` [RFC 01/13] dt-bindings: Introduce 64bit-mmio-broken Nicolas Saenz Julienne
2021-02-26 14:02 ` [RFC 02/13] driver core: Introduce MMIO configuration Nicolas Saenz Julienne
2021-03-02 11:29   ` Robin Murphy
2021-03-02 14:09     ` Nicolas Saenz Julienne
2021-02-26 14:02 ` Nicolas Saenz Julienne [this message]
2021-02-26 14:02 ` [RFC 04/13] driver core: plafrom: Introduce platform_mmio_configure() Nicolas Saenz Julienne
2021-02-26 14:02 ` [RFC 05/13] pci: Introduce pci_mmio_configure() Nicolas Saenz Julienne
2021-02-26 14:02 ` [RFC 06/13] device core: Introduce dev_64bit_mmio_supported() Nicolas Saenz Julienne
2021-02-26 14:02 ` [RFC 07/13] arm64: Mark ARCH_MVEBU as needing broken 64bit MMIO support Nicolas Saenz Julienne
2021-02-26 14:03 ` [RFC 08/13] arm64: dts: marvell: armada-ap80x: Mark config-space bus as 64bit-mmio-broken Nicolas Saenz Julienne
2021-02-26 14:03 ` [RFC 09/13] iommu/arm-smmu: Make use of dev_64bit_mmio_supported() Nicolas Saenz Julienne
2021-03-02  9:32   ` Arnd Bergmann
2021-03-02 12:42     ` Nicolas Saenz Julienne
2021-03-02 11:07   ` Robin Murphy
2021-03-02 13:38     ` Nicolas Saenz Julienne
2021-03-03  8:44     ` Arnd Bergmann
2021-02-26 14:03 ` [RFC 10/13] iommu/arm-smmu-impl: Get rid of Marvell's implementation details Nicolas Saenz Julienne
2021-03-02 11:40   ` Robin Murphy
2021-03-02 14:06     ` Nicolas Saenz Julienne
2021-02-26 14:03 ` [RFC 11/13] arm64: Mark ARCH_BCM2835 as needing broken 64bit MMIO support Nicolas Saenz Julienne
2021-02-26 14:03 ` [RFC 12/13] ARM: dts: bcm2711: Mark PCIe bus as 64bit-mmio-broken Nicolas Saenz Julienne
2021-02-26 14:03 ` [RFC 13/13] scsi: megaraid: Make use of dev_64bit_mmio_supported() Nicolas Saenz Julienne
2021-02-26 14:30   ` Arnd Bergmann
2021-02-26 18:06     ` Arnd Bergmann

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