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568 lines
14 KiB
568 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Unisoc IOMMU driver |
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* |
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* Copyright (C) 2020 Unisoc, Inc. |
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* Author: Chunyan Zhang <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/errno.h> |
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#include <linux/iommu.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#define SPRD_IOMMU_PAGE_SHIFT 12 |
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#define SPRD_IOMMU_PAGE_SIZE SZ_4K |
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#define SPRD_EX_CFG 0x0 |
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#define SPRD_IOMMU_VAOR_BYPASS BIT(4) |
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#define SPRD_IOMMU_GATE_EN BIT(1) |
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#define SPRD_IOMMU_EN BIT(0) |
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#define SPRD_EX_UPDATE 0x4 |
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#define SPRD_EX_FIRST_VPN 0x8 |
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#define SPRD_EX_VPN_RANGE 0xc |
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#define SPRD_EX_FIRST_PPN 0x10 |
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#define SPRD_EX_DEFAULT_PPN 0x14 |
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#define SPRD_IOMMU_VERSION 0x0 |
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#define SPRD_VERSION_MASK GENMASK(15, 8) |
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#define SPRD_VERSION_SHIFT 0x8 |
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#define SPRD_VAU_CFG 0x4 |
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#define SPRD_VAU_UPDATE 0x8 |
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#define SPRD_VAU_AUTH_CFG 0xc |
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#define SPRD_VAU_FIRST_PPN 0x10 |
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#define SPRD_VAU_DEFAULT_PPN_RD 0x14 |
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#define SPRD_VAU_DEFAULT_PPN_WR 0x18 |
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#define SPRD_VAU_FIRST_VPN 0x1c |
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#define SPRD_VAU_VPN_RANGE 0x20 |
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enum sprd_iommu_version { |
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SPRD_IOMMU_EX, |
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SPRD_IOMMU_VAU, |
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}; |
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/* |
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* struct sprd_iommu_device - high-level sprd IOMMU device representation, |
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* including hardware information and configuration, also driver data, etc |
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* |
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* @ver: sprd IOMMU IP version |
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* @prot_page_va: protect page base virtual address |
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* @prot_page_pa: protect page base physical address, data would be |
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* written to here while translation fault |
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* @base: mapped base address for accessing registers |
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* @dev: pointer to basic device structure |
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* @iommu: IOMMU core representation |
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* @group: IOMMU group |
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* @eb: gate clock which controls IOMMU access |
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*/ |
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struct sprd_iommu_device { |
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enum sprd_iommu_version ver; |
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u32 *prot_page_va; |
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dma_addr_t prot_page_pa; |
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void __iomem *base; |
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struct device *dev; |
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struct iommu_device iommu; |
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struct iommu_group *group; |
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struct clk *eb; |
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}; |
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struct sprd_iommu_domain { |
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spinlock_t pgtlock; /* lock for page table */ |
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struct iommu_domain domain; |
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u32 *pgt_va; /* page table virtual address base */ |
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dma_addr_t pgt_pa; /* page table physical address base */ |
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struct sprd_iommu_device *sdev; |
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}; |
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static const struct iommu_ops sprd_iommu_ops; |
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static struct sprd_iommu_domain *to_sprd_domain(struct iommu_domain *dom) |
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{ |
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return container_of(dom, struct sprd_iommu_domain, domain); |
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} |
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static inline void |
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sprd_iommu_write(struct sprd_iommu_device *sdev, unsigned int reg, u32 val) |
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{ |
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writel_relaxed(val, sdev->base + reg); |
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} |
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static inline u32 |
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sprd_iommu_read(struct sprd_iommu_device *sdev, unsigned int reg) |
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{ |
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return readl_relaxed(sdev->base + reg); |
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} |
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static inline void |
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sprd_iommu_update_bits(struct sprd_iommu_device *sdev, unsigned int reg, |
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u32 mask, u32 shift, u32 val) |
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{ |
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u32 t = sprd_iommu_read(sdev, reg); |
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t = (t & (~(mask << shift))) | ((val & mask) << shift); |
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sprd_iommu_write(sdev, reg, t); |
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} |
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static inline int |
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sprd_iommu_get_version(struct sprd_iommu_device *sdev) |
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{ |
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int ver = (sprd_iommu_read(sdev, SPRD_IOMMU_VERSION) & |
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SPRD_VERSION_MASK) >> SPRD_VERSION_SHIFT; |
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switch (ver) { |
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case SPRD_IOMMU_EX: |
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case SPRD_IOMMU_VAU: |
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return ver; |
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default: |
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return -EINVAL; |
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} |
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} |
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static size_t |
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sprd_iommu_pgt_size(struct iommu_domain *domain) |
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{ |
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return ((domain->geometry.aperture_end - |
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domain->geometry.aperture_start + 1) >> |
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SPRD_IOMMU_PAGE_SHIFT) * sizeof(u32); |
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} |
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static struct iommu_domain *sprd_iommu_domain_alloc(unsigned int domain_type) |
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{ |
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struct sprd_iommu_domain *dom; |
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if (domain_type != IOMMU_DOMAIN_DMA && domain_type != IOMMU_DOMAIN_UNMANAGED) |
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return NULL; |
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dom = kzalloc(sizeof(*dom), GFP_KERNEL); |
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if (!dom) |
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return NULL; |
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spin_lock_init(&dom->pgtlock); |
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dom->domain.geometry.aperture_start = 0; |
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dom->domain.geometry.aperture_end = SZ_256M - 1; |
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return &dom->domain; |
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} |
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static void sprd_iommu_domain_free(struct iommu_domain *domain) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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kfree(dom); |
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} |
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static void sprd_iommu_first_vpn(struct sprd_iommu_domain *dom) |
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{ |
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struct sprd_iommu_device *sdev = dom->sdev; |
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u32 val; |
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unsigned int reg; |
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if (sdev->ver == SPRD_IOMMU_EX) |
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reg = SPRD_EX_FIRST_VPN; |
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else |
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reg = SPRD_VAU_FIRST_VPN; |
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val = dom->domain.geometry.aperture_start >> SPRD_IOMMU_PAGE_SHIFT; |
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sprd_iommu_write(sdev, reg, val); |
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} |
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static void sprd_iommu_vpn_range(struct sprd_iommu_domain *dom) |
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{ |
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struct sprd_iommu_device *sdev = dom->sdev; |
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u32 val; |
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unsigned int reg; |
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if (sdev->ver == SPRD_IOMMU_EX) |
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reg = SPRD_EX_VPN_RANGE; |
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else |
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reg = SPRD_VAU_VPN_RANGE; |
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val = (dom->domain.geometry.aperture_end - |
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dom->domain.geometry.aperture_start) >> SPRD_IOMMU_PAGE_SHIFT; |
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sprd_iommu_write(sdev, reg, val); |
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} |
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static void sprd_iommu_first_ppn(struct sprd_iommu_domain *dom) |
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{ |
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u32 val = dom->pgt_pa >> SPRD_IOMMU_PAGE_SHIFT; |
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struct sprd_iommu_device *sdev = dom->sdev; |
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unsigned int reg; |
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if (sdev->ver == SPRD_IOMMU_EX) |
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reg = SPRD_EX_FIRST_PPN; |
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else |
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reg = SPRD_VAU_FIRST_PPN; |
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sprd_iommu_write(sdev, reg, val); |
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} |
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static void sprd_iommu_default_ppn(struct sprd_iommu_device *sdev) |
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{ |
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u32 val = sdev->prot_page_pa >> SPRD_IOMMU_PAGE_SHIFT; |
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if (sdev->ver == SPRD_IOMMU_EX) { |
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sprd_iommu_write(sdev, SPRD_EX_DEFAULT_PPN, val); |
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} else if (sdev->ver == SPRD_IOMMU_VAU) { |
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sprd_iommu_write(sdev, SPRD_VAU_DEFAULT_PPN_RD, val); |
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sprd_iommu_write(sdev, SPRD_VAU_DEFAULT_PPN_WR, val); |
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} |
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} |
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static void sprd_iommu_hw_en(struct sprd_iommu_device *sdev, bool en) |
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{ |
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unsigned int reg_cfg; |
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u32 mask, val; |
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if (sdev->ver == SPRD_IOMMU_EX) |
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reg_cfg = SPRD_EX_CFG; |
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else |
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reg_cfg = SPRD_VAU_CFG; |
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mask = SPRD_IOMMU_EN | SPRD_IOMMU_GATE_EN; |
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val = en ? mask : 0; |
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sprd_iommu_update_bits(sdev, reg_cfg, mask, 0, val); |
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} |
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static int sprd_iommu_attach_device(struct iommu_domain *domain, |
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struct device *dev) |
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{ |
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struct sprd_iommu_device *sdev = dev_iommu_priv_get(dev); |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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size_t pgt_size = sprd_iommu_pgt_size(domain); |
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if (dom->sdev) { |
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pr_err("There's already a device attached to this domain.\n"); |
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return -EINVAL; |
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} |
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dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL); |
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if (!dom->pgt_va) |
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return -ENOMEM; |
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dom->sdev = sdev; |
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sprd_iommu_first_ppn(dom); |
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sprd_iommu_first_vpn(dom); |
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sprd_iommu_vpn_range(dom); |
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sprd_iommu_default_ppn(sdev); |
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sprd_iommu_hw_en(sdev, true); |
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return 0; |
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} |
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static void sprd_iommu_detach_device(struct iommu_domain *domain, |
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struct device *dev) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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struct sprd_iommu_device *sdev = dom->sdev; |
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size_t pgt_size = sprd_iommu_pgt_size(domain); |
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if (!sdev) |
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return; |
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dma_free_coherent(sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa); |
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sprd_iommu_hw_en(sdev, false); |
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dom->sdev = NULL; |
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} |
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static int sprd_iommu_map(struct iommu_domain *domain, unsigned long iova, |
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phys_addr_t paddr, size_t size, int prot, gfp_t gfp) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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unsigned int page_num = size >> SPRD_IOMMU_PAGE_SHIFT; |
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unsigned long flags; |
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unsigned int i; |
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u32 *pgt_base_iova; |
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u32 pabase = (u32)paddr; |
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unsigned long start = domain->geometry.aperture_start; |
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unsigned long end = domain->geometry.aperture_end; |
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if (!dom->sdev) { |
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pr_err("No sprd_iommu_device attached to the domain\n"); |
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return -EINVAL; |
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} |
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if (iova < start || (iova + size) > (end + 1)) { |
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dev_err(dom->sdev->dev, "(iova(0x%lx) + size(%zx)) are not in the range!\n", |
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iova, size); |
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return -EINVAL; |
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} |
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pgt_base_iova = dom->pgt_va + ((iova - start) >> SPRD_IOMMU_PAGE_SHIFT); |
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spin_lock_irqsave(&dom->pgtlock, flags); |
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for (i = 0; i < page_num; i++) { |
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pgt_base_iova[i] = pabase >> SPRD_IOMMU_PAGE_SHIFT; |
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pabase += SPRD_IOMMU_PAGE_SIZE; |
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} |
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spin_unlock_irqrestore(&dom->pgtlock, flags); |
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return 0; |
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} |
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static size_t sprd_iommu_unmap(struct iommu_domain *domain, unsigned long iova, |
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size_t size, struct iommu_iotlb_gather *iotlb_gather) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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unsigned long flags; |
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u32 *pgt_base_iova; |
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unsigned int page_num = size >> SPRD_IOMMU_PAGE_SHIFT; |
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unsigned long start = domain->geometry.aperture_start; |
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unsigned long end = domain->geometry.aperture_end; |
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if (iova < start || (iova + size) > (end + 1)) |
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return -EINVAL; |
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pgt_base_iova = dom->pgt_va + ((iova - start) >> SPRD_IOMMU_PAGE_SHIFT); |
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spin_lock_irqsave(&dom->pgtlock, flags); |
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memset(pgt_base_iova, 0, page_num * sizeof(u32)); |
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spin_unlock_irqrestore(&dom->pgtlock, flags); |
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return 0; |
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} |
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static void sprd_iommu_sync_map(struct iommu_domain *domain, |
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unsigned long iova, size_t size) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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unsigned int reg; |
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if (dom->sdev->ver == SPRD_IOMMU_EX) |
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reg = SPRD_EX_UPDATE; |
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else |
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reg = SPRD_VAU_UPDATE; |
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/* clear IOMMU TLB buffer after page table updated */ |
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sprd_iommu_write(dom->sdev, reg, 0xffffffff); |
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} |
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static void sprd_iommu_sync(struct iommu_domain *domain, |
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struct iommu_iotlb_gather *iotlb_gather) |
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{ |
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sprd_iommu_sync_map(domain, 0, 0); |
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} |
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static phys_addr_t sprd_iommu_iova_to_phys(struct iommu_domain *domain, |
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dma_addr_t iova) |
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{ |
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struct sprd_iommu_domain *dom = to_sprd_domain(domain); |
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unsigned long flags; |
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phys_addr_t pa; |
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unsigned long start = domain->geometry.aperture_start; |
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unsigned long end = domain->geometry.aperture_end; |
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if (WARN_ON(iova < start || iova > end)) |
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return 0; |
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spin_lock_irqsave(&dom->pgtlock, flags); |
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pa = *(dom->pgt_va + ((iova - start) >> SPRD_IOMMU_PAGE_SHIFT)); |
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pa = (pa << SPRD_IOMMU_PAGE_SHIFT) + ((iova - start) & (SPRD_IOMMU_PAGE_SIZE - 1)); |
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spin_unlock_irqrestore(&dom->pgtlock, flags); |
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return pa; |
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} |
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static struct iommu_device *sprd_iommu_probe_device(struct device *dev) |
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{ |
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
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struct sprd_iommu_device *sdev; |
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if (!fwspec || fwspec->ops != &sprd_iommu_ops) |
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return ERR_PTR(-ENODEV); |
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sdev = dev_iommu_priv_get(dev); |
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return &sdev->iommu; |
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} |
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static void sprd_iommu_release_device(struct device *dev) |
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{ |
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); |
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if (!fwspec || fwspec->ops != &sprd_iommu_ops) |
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return; |
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iommu_fwspec_free(dev); |
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} |
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static struct iommu_group *sprd_iommu_device_group(struct device *dev) |
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{ |
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struct sprd_iommu_device *sdev = dev_iommu_priv_get(dev); |
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return iommu_group_ref_get(sdev->group); |
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} |
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static int sprd_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) |
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{ |
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struct platform_device *pdev; |
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if (!dev_iommu_priv_get(dev)) { |
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pdev = of_find_device_by_node(args->np); |
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dev_iommu_priv_set(dev, platform_get_drvdata(pdev)); |
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platform_device_put(pdev); |
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} |
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return 0; |
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} |
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static const struct iommu_ops sprd_iommu_ops = { |
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.domain_alloc = sprd_iommu_domain_alloc, |
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.domain_free = sprd_iommu_domain_free, |
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.attach_dev = sprd_iommu_attach_device, |
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.detach_dev = sprd_iommu_detach_device, |
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.map = sprd_iommu_map, |
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.unmap = sprd_iommu_unmap, |
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.iotlb_sync_map = sprd_iommu_sync_map, |
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.iotlb_sync = sprd_iommu_sync, |
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.iova_to_phys = sprd_iommu_iova_to_phys, |
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.probe_device = sprd_iommu_probe_device, |
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.release_device = sprd_iommu_release_device, |
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.device_group = sprd_iommu_device_group, |
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.of_xlate = sprd_iommu_of_xlate, |
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.pgsize_bitmap = ~0UL << SPRD_IOMMU_PAGE_SHIFT, |
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.owner = THIS_MODULE, |
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}; |
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static const struct of_device_id sprd_iommu_of_match[] = { |
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{ .compatible = "sprd,iommu-v1" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, sprd_iommu_of_match); |
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|
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/* |
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* Clock is not required, access to some of IOMMUs is controlled by gate |
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* clk, enabled clocks for that kind of IOMMUs before accessing. |
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* Return 0 for success or no clocks found. |
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*/ |
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static int sprd_iommu_clk_enable(struct sprd_iommu_device *sdev) |
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{ |
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struct clk *eb; |
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eb = devm_clk_get_optional(sdev->dev, NULL); |
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if (!eb) |
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return 0; |
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if (IS_ERR(eb)) |
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return PTR_ERR(eb); |
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sdev->eb = eb; |
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return clk_prepare_enable(eb); |
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} |
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static void sprd_iommu_clk_disable(struct sprd_iommu_device *sdev) |
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{ |
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if (sdev->eb) |
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clk_disable_unprepare(sdev->eb); |
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} |
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static int sprd_iommu_probe(struct platform_device *pdev) |
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{ |
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struct sprd_iommu_device *sdev; |
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struct device *dev = &pdev->dev; |
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void __iomem *base; |
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int ret; |
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sdev = devm_kzalloc(dev, sizeof(*sdev), GFP_KERNEL); |
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if (!sdev) |
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return -ENOMEM; |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) { |
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dev_err(dev, "Failed to get ioremap resource.\n"); |
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return PTR_ERR(base); |
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} |
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sdev->base = base; |
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sdev->prot_page_va = dma_alloc_coherent(dev, SPRD_IOMMU_PAGE_SIZE, |
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&sdev->prot_page_pa, GFP_KERNEL); |
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if (!sdev->prot_page_va) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, sdev); |
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sdev->dev = dev; |
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/* All the client devices are in the same iommu-group */ |
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sdev->group = iommu_group_alloc(); |
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if (IS_ERR(sdev->group)) { |
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ret = PTR_ERR(sdev->group); |
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goto free_page; |
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} |
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ret = iommu_device_sysfs_add(&sdev->iommu, dev, NULL, dev_name(dev)); |
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if (ret) |
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goto put_group; |
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ret = iommu_device_register(&sdev->iommu, &sprd_iommu_ops, dev); |
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if (ret) |
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goto remove_sysfs; |
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if (!iommu_present(&platform_bus_type)) |
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bus_set_iommu(&platform_bus_type, &sprd_iommu_ops); |
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ret = sprd_iommu_clk_enable(sdev); |
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if (ret) |
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goto unregister_iommu; |
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ret = sprd_iommu_get_version(sdev); |
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if (ret < 0) { |
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dev_err(dev, "IOMMU version(%d) is invalid.\n", ret); |
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goto disable_clk; |
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} |
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sdev->ver = ret; |
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return 0; |
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disable_clk: |
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sprd_iommu_clk_disable(sdev); |
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unregister_iommu: |
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iommu_device_unregister(&sdev->iommu); |
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remove_sysfs: |
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iommu_device_sysfs_remove(&sdev->iommu); |
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put_group: |
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iommu_group_put(sdev->group); |
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free_page: |
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dma_free_coherent(sdev->dev, SPRD_IOMMU_PAGE_SIZE, sdev->prot_page_va, sdev->prot_page_pa); |
|
return ret; |
|
} |
|
|
|
static int sprd_iommu_remove(struct platform_device *pdev) |
|
{ |
|
struct sprd_iommu_device *sdev = platform_get_drvdata(pdev); |
|
|
|
dma_free_coherent(sdev->dev, SPRD_IOMMU_PAGE_SIZE, sdev->prot_page_va, sdev->prot_page_pa); |
|
|
|
iommu_group_put(sdev->group); |
|
sdev->group = NULL; |
|
|
|
bus_set_iommu(&platform_bus_type, NULL); |
|
|
|
platform_set_drvdata(pdev, NULL); |
|
iommu_device_sysfs_remove(&sdev->iommu); |
|
iommu_device_unregister(&sdev->iommu); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver sprd_iommu_driver = { |
|
.driver = { |
|
.name = "sprd-iommu", |
|
.of_match_table = sprd_iommu_of_match, |
|
.suppress_bind_attrs = true, |
|
}, |
|
.probe = sprd_iommu_probe, |
|
.remove = sprd_iommu_remove, |
|
}; |
|
module_platform_driver(sprd_iommu_driver); |
|
|
|
MODULE_DESCRIPTION("IOMMU driver for Unisoc SoCs"); |
|
MODULE_ALIAS("platform:sprd-iommu"); |
|
MODULE_LICENSE("GPL");
|
|
|