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![Linus Torvalds](/assets/img/avatar_default.png)
DT core: - Add support for generating DT nodes for PCI devices. This is the groundwork for applying overlays to PCI devices containing non-discoverable downstream devices. - DT unittest additions to check reverted changesets, to test for refcount issues, and to test unresolved symbols. Also, various clean-ups of the unittest along the way. - Refactor node and property manipulation functions to better share code with old API and changeset API - Refactor changeset print functions to a common implementation - Move some platform_device specific functions into of_platform.c Bindings: - Treewide fixing of typos - Treewide clean-up of SPDX tags to use 'OR' consistently - Last chunk of dropping unnecessary quotes. With that, the check for unnecessary quotes is enabled in yamllint. - Convert ftgmac100, zynqmp-genpd, pps-gpio, syna,rmi4, and qcom,ssbi bindings to DT schema format - Add Allwinner V3s xHCI USB, Saef SF-TC154B display, QCom SM8450 Inline Crypto Engine, QCom SM6115 UFS, QCom SDM670 PDC interrupt controller, Arm 2022 Cortex cores, and QCom IPQ9574 Crypto bindings - Fixes for Rockchip DWC PCI binding - Ensure all properties are evaluated on USB connector schema - Fix dt-check-compatible script to find of_device_id instances with compiler annotations -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEktVUI4SxYhzZyEuo+vtdtY28YcMFAmTubyoACgkQ+vtdtY28 YcPamA//feXFYNPiIbSa7XqfAu1PE5XSg3PqCe77QvLBGJU7saTwRJApc88iTjlA hc5EELnZKp3FE9N7DJdmvEjYxKDqtJOukO+txKy3mFBWo+gZQURthZVcbLxUZmpw XmYA4b/GrIv5h8YWG1wokyaGTtSfTcf0+RmAtVepiDk5kWQKaC04Let356fKn9xi ePgLTZV6BJvPoGpMWd08o+1szUAc6Vihs9qWu7g0+mtb5K5xi/l05YMz3REu7kpf iz06CE/uzYvHpFBJZ6izN+9Qqxh52DnWckXX68v8kStHUON2h1YmZYvjhGrfay4k rHeDnHoRBrepDDCytXQ/fxzGtURr3b8yBnlhzEQadMLXmf25mm+TRBDmf6GnX5ij QmHlj+eSARIafcbb4fqF1Hdyv8c7XM0AkEnj1XrIWLtXPuRNSHlS25dngCztbII/ lqmtBaH1ifCKj2VQ8YL8sVX7k208YU9vDNKZHQyA8dPEYwhknrWmp1F0OAnBB+wz F11kDE7xkZ0/gE7mUHwe9mP94hC6Ceks4IuBvsTzBmSwqXxyCz8gM2KHK4U3gNUr Sk2hWgZn+k2HM9zLb38FE18C6hqws6RBUWnJwZ4V3qPo2eYJ8Jzkvm7oonxjHgCC 4FmYYAoCQhBEkZPOJ4map0eO5VbShn9Hrgs46Jj4WoXmm7dFDLc= =kl+z -----END PGP SIGNATURE----- Merge tag 'devicetree-for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull devicetree updates from Rob Herring: "DT core: - Add support for generating DT nodes for PCI devices. This is the groundwork for applying overlays to PCI devices containing non-discoverable downstream devices. - DT unittest additions to check reverted changesets, to test for refcount issues, and to test unresolved symbols. Also, various clean-ups of the unittest along the way. - Refactor node and property manipulation functions to better share code with old API and changeset API - Refactor changeset print functions to a common implementation - Move some platform_device specific functions into of_platform.c Bindings: - Treewide fixing of typos - Treewide clean-up of SPDX tags to use 'OR' consistently - Last chunk of dropping unnecessary quotes. With that, the check for unnecessary quotes is enabled in yamllint. - Convert ftgmac100, zynqmp-genpd, pps-gpio, syna,rmi4, and qcom,ssbi bindings to DT schema format - Add Allwinner V3s xHCI USB, Saef SF-TC154B display, QCom SM8450 Inline Crypto Engine, QCom SM6115 UFS, QCom SDM670 PDC interrupt controller, Arm 2022 Cortex cores, and QCom IPQ9574 Crypto bindings - Fixes for Rockchip DWC PCI binding - Ensure all properties are evaluated on USB connector schema - Fix dt-check-compatible script to find of_device_id instances with compiler annotations" * tag 'devicetree-for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (64 commits) dt-bindings: usb: Add V3s compatible string for OHCI dt-bindings: usb: Add V3s compatible string for EHCI dt-bindings: display: panel: mipi-dbi-spi: add Saef SF-TC154B dt-bindings: vendor-prefixes: document Saef Technology dt-bindings: thermal: lmh: update maintainer address of: unittest: Fix of_unittest_pci_node() kconfig dependencies dt-bindings: crypto: ice: Document sm8450 inline crypto engine dt-bindings: ufs: qcom: Add ICE to sm8450 example dt-bindings: ufs: qcom: Add sm6115 binding dt-bindings: ufs: qcom: Add reg-names property for ICE dt-bindings: yamllint: Enable quoted string check dt-bindings: Drop remaining unneeded quotes of: unittest-data: Fix whitespace - angular brackets of: unittest-data: Fix whitespace - indentation of: unittest-data: Fix whitespace - blank lines of: unittest-data: Convert remaining overlay DTS files to sugar syntax of: overlay: unittest: Add test for unresolved symbol of: unittest: Add separators to of_unittest_overlay_high_level() of: unittest: Cleanup partially-applied overlays of: unittest: Merge of_unittest_apply{,_revert}_overlay_check() ...
306 lines
8.1 KiB
C
306 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/of_iommu.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/dma-direct.h> /* for bus_dma_region */
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#include <linux/dma-map-ops.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <asm/errno.h>
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#include "of_private.h"
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/**
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* of_match_device - Tell if a struct device matches an of_device_id list
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* @matches: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an platform_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct device *dev)
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{
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if (!matches || !dev->of_node || dev->of_node_reused)
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return NULL;
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return of_match_node(matches, dev->of_node);
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}
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EXPORT_SYMBOL(of_match_device);
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static void
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of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
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{
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struct device_node *node, *of_node = dev->of_node;
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int count, i;
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if (!IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL))
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return;
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count = of_property_count_elems_of_size(of_node, "memory-region",
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sizeof(u32));
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/*
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* If dev->of_node doesn't exist or doesn't contain memory-region, try
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* the OF node having DMA configuration.
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*/
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if (count <= 0) {
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of_node = np;
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count = of_property_count_elems_of_size(
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of_node, "memory-region", sizeof(u32));
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}
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for (i = 0; i < count; i++) {
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node = of_parse_phandle(of_node, "memory-region", i);
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/*
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* There might be multiple memory regions, but only one
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* restricted-dma-pool region is allowed.
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*/
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if (of_device_is_compatible(node, "restricted-dma-pool") &&
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of_device_is_available(node)) {
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of_node_put(node);
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break;
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}
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of_node_put(node);
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}
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/*
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* Attempt to initialize a restricted-dma-pool region if one was found.
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* Note that count can hold a negative error code.
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*/
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if (i < count && of_reserved_mem_device_init_by_idx(dev, of_node, i))
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dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");
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}
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/**
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* of_dma_configure_id - Setup DMA configuration
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* @dev: Device to apply DMA configuration
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* @np: Pointer to OF node having DMA configuration
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* @force_dma: Whether device is to be set up by of_dma_configure() even if
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* DMA capability is not explicitly described by firmware.
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* @id: Optional const pointer value input id
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*
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* Try to get devices's DMA configuration from DT and update it
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* accordingly.
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*
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* If platform code needs to use its own special DMA configuration, it
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* can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
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* to fix up DMA configuration.
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*/
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int of_dma_configure_id(struct device *dev, struct device_node *np,
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bool force_dma, const u32 *id)
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{
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const struct iommu_ops *iommu;
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const struct bus_dma_region *map = NULL;
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struct device_node *bus_np;
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u64 dma_start = 0;
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u64 mask, end, size = 0;
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bool coherent;
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int ret;
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if (np == dev->of_node)
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bus_np = __of_get_dma_parent(np);
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else
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bus_np = of_node_get(np);
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ret = of_dma_get_range(bus_np, &map);
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of_node_put(bus_np);
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if (ret < 0) {
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/*
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* For legacy reasons, we have to assume some devices need
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* DMA configuration regardless of whether "dma-ranges" is
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* correctly specified or not.
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*/
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if (!force_dma)
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return ret == -ENODEV ? 0 : ret;
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} else {
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const struct bus_dma_region *r = map;
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u64 dma_end = 0;
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/* Determine the overall bounds of all DMA regions */
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for (dma_start = ~0; r->size; r++) {
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/* Take lower and upper limits */
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if (r->dma_start < dma_start)
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dma_start = r->dma_start;
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if (r->dma_start + r->size > dma_end)
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dma_end = r->dma_start + r->size;
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}
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size = dma_end - dma_start;
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/*
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* Add a work around to treat the size as mask + 1 in case
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* it is defined in DT as a mask.
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*/
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if (size & 1) {
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dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",
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size);
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size = size + 1;
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}
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if (!size) {
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dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
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kfree(map);
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return -EINVAL;
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}
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}
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/*
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* If @dev is expected to be DMA-capable then the bus code that created
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* it should have initialised its dma_mask pointer by this point. For
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* now, we'll continue the legacy behaviour of coercing it to the
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* coherent mask if not, but we'll no longer do so quietly.
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*/
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if (!dev->dma_mask) {
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dev_warn(dev, "DMA mask not set\n");
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dev->dma_mask = &dev->coherent_dma_mask;
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}
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if (!size && dev->coherent_dma_mask)
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size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
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else if (!size)
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size = 1ULL << 32;
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/*
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* Limit coherent and dma mask based on size and default mask
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* set by the driver.
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*/
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end = dma_start + size - 1;
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mask = DMA_BIT_MASK(ilog2(end) + 1);
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dev->coherent_dma_mask &= mask;
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*dev->dma_mask &= mask;
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/* ...but only set bus limit and range map if we found valid dma-ranges earlier */
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if (!ret) {
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dev->bus_dma_limit = end;
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dev->dma_range_map = map;
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}
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coherent = of_dma_is_coherent(np);
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dev_dbg(dev, "device is%sdma coherent\n",
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coherent ? " " : " not ");
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iommu = of_iommu_configure(dev, np, id);
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if (PTR_ERR(iommu) == -EPROBE_DEFER) {
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/* Don't touch range map if it wasn't set from a valid dma-ranges */
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if (!ret)
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dev->dma_range_map = NULL;
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kfree(map);
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return -EPROBE_DEFER;
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}
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dev_dbg(dev, "device is%sbehind an iommu\n",
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iommu ? " " : " not ");
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arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
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if (!iommu)
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of_dma_set_restricted_buffer(dev, np);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_dma_configure_id);
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const void *of_device_get_match_data(const struct device *dev)
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{
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const struct of_device_id *match;
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match = of_match_device(dev->driver->of_match_table, dev);
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if (!match)
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return NULL;
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return match->data;
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}
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EXPORT_SYMBOL(of_device_get_match_data);
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/**
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* of_device_modalias - Fill buffer with newline terminated modalias string
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* @dev: Calling device
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* @str: Modalias string
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* @len: Size of @str
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*/
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ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
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{
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ssize_t sl;
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if (!dev || !dev->of_node || dev->of_node_reused)
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return -ENODEV;
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sl = of_modalias(dev->of_node, str, len - 2);
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if (sl < 0)
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return sl;
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if (sl > len - 2)
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return -ENOMEM;
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str[sl++] = '\n';
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str[sl] = 0;
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return sl;
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}
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EXPORT_SYMBOL_GPL(of_device_modalias);
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/**
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* of_device_uevent - Display OF related uevent information
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* @dev: Device to display the uevent information for
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* @env: Kernel object's userspace event reference to fill up
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*/
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void of_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
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{
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const char *compat, *type;
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struct alias_prop *app;
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struct property *p;
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int seen = 0;
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if ((!dev) || (!dev->of_node))
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return;
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add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);
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add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
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type = of_node_get_device_type(dev->of_node);
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if (type)
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add_uevent_var(env, "OF_TYPE=%s", type);
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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of_property_for_each_string(dev->of_node, "compatible", p, compat) {
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add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
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seen++;
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}
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add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
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seen = 0;
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mutex_lock(&of_mutex);
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list_for_each_entry(app, &aliases_lookup, link) {
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if (dev->of_node == app->np) {
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add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
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app->alias);
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seen++;
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}
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}
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mutex_unlock(&of_mutex);
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}
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EXPORT_SYMBOL_GPL(of_device_uevent);
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int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env)
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{
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int sl;
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if ((!dev) || (!dev->of_node) || dev->of_node_reused)
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return -ENODEV;
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/* Devicetree modalias is tricky, we add it in 2 steps */
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if (add_uevent_var(env, "MODALIAS="))
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return -ENOMEM;
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sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],
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sizeof(env->buf) - env->buflen);
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if (sl < 0)
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return sl;
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if (sl >= (sizeof(env->buf) - env->buflen))
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return -ENOMEM;
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env->buflen += sl;
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
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