// SPDX-License-Identifier: GPL-2.0-only /* * Unisoc IOMMU driver * * Copyright (C) 2020 Unisoc, Inc. * Author: Chunyan Zhang <[email protected]> */ #include <linux/clk.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/errno.h> #include <linux/iommu.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #define SPRD_IOMMU_PAGE_SHIFT … #define SPRD_IOMMU_PAGE_SIZE … #define SPRD_EX_CFG … #define SPRD_IOMMU_VAOR_BYPASS … #define SPRD_IOMMU_GATE_EN … #define SPRD_IOMMU_EN … #define SPRD_EX_UPDATE … #define SPRD_EX_FIRST_VPN … #define SPRD_EX_VPN_RANGE … #define SPRD_EX_FIRST_PPN … #define SPRD_EX_DEFAULT_PPN … #define SPRD_IOMMU_VERSION … #define SPRD_VERSION_MASK … #define SPRD_VERSION_SHIFT … #define SPRD_VAU_CFG … #define SPRD_VAU_UPDATE … #define SPRD_VAU_AUTH_CFG … #define SPRD_VAU_FIRST_PPN … #define SPRD_VAU_DEFAULT_PPN_RD … #define SPRD_VAU_DEFAULT_PPN_WR … #define SPRD_VAU_FIRST_VPN … #define SPRD_VAU_VPN_RANGE … enum sprd_iommu_version { … }; /* * struct sprd_iommu_device - high-level sprd IOMMU device representation, * including hardware information and configuration, also driver data, etc * * @ver: sprd IOMMU IP version * @prot_page_va: protect page base virtual address * @prot_page_pa: protect page base physical address, data would be * written to here while translation fault * @base: mapped base address for accessing registers * @dev: pointer to basic device structure * @iommu: IOMMU core representation * @group: IOMMU group * @eb: gate clock which controls IOMMU access */ struct sprd_iommu_device { … }; struct sprd_iommu_domain { … }; static const struct iommu_ops sprd_iommu_ops; static struct sprd_iommu_domain *to_sprd_domain(struct iommu_domain *dom) { … } static inline void sprd_iommu_write(struct sprd_iommu_device *sdev, unsigned int reg, u32 val) { … } static inline u32 sprd_iommu_read(struct sprd_iommu_device *sdev, unsigned int reg) { … } static inline void sprd_iommu_update_bits(struct sprd_iommu_device *sdev, unsigned int reg, u32 mask, u32 shift, u32 val) { … } static inline int sprd_iommu_get_version(struct sprd_iommu_device *sdev) { … } static size_t sprd_iommu_pgt_size(struct iommu_domain *domain) { … } static struct iommu_domain *sprd_iommu_domain_alloc_paging(struct device *dev) { … } static void sprd_iommu_first_vpn(struct sprd_iommu_domain *dom) { … } static void sprd_iommu_vpn_range(struct sprd_iommu_domain *dom) { … } static void sprd_iommu_first_ppn(struct sprd_iommu_domain *dom) { … } static void sprd_iommu_default_ppn(struct sprd_iommu_device *sdev) { … } static void sprd_iommu_hw_en(struct sprd_iommu_device *sdev, bool en) { … } static void sprd_iommu_cleanup(struct sprd_iommu_domain *dom) { … } static void sprd_iommu_domain_free(struct iommu_domain *domain) { … } static int sprd_iommu_attach_device(struct iommu_domain *domain, struct device *dev) { … } static int sprd_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t pgsize, size_t pgcount, int prot, gfp_t gfp, size_t *mapped) { … } static size_t sprd_iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t pgsize, size_t pgcount, struct iommu_iotlb_gather *iotlb_gather) { … } static int sprd_iommu_sync_map(struct iommu_domain *domain, unsigned long iova, size_t size) { … } static void sprd_iommu_sync(struct iommu_domain *domain, struct iommu_iotlb_gather *iotlb_gather) { … } static phys_addr_t sprd_iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) { … } static struct iommu_device *sprd_iommu_probe_device(struct device *dev) { … } static int sprd_iommu_of_xlate(struct device *dev, const struct of_phandle_args *args) { … } static const struct iommu_ops sprd_iommu_ops = …; static const struct of_device_id sprd_iommu_of_match[] = …; MODULE_DEVICE_TABLE(of, sprd_iommu_of_match); /* * Clock is not required, access to some of IOMMUs is controlled by gate * clk, enabled clocks for that kind of IOMMUs before accessing. * Return 0 for success or no clocks found. */ static int sprd_iommu_clk_enable(struct sprd_iommu_device *sdev) { … } static void sprd_iommu_clk_disable(struct sprd_iommu_device *sdev) { … } static int sprd_iommu_probe(struct platform_device *pdev) { … } static void sprd_iommu_remove(struct platform_device *pdev) { … } static struct platform_driver sprd_iommu_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …; MODULE_LICENSE(…) …;
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