[PATCH 2/3] iommu/hisilicon: Add hi6220-SoC smmu driver
From: Chen Feng
Date: Tue Nov 17 2015 - 06:58:37 EST
Add iommu driver for hi6220 SoC platform.The smmu on hi6220
SoC is for media system.And the media IP use the same page-table.
It supports only one-to-one mapping from iova to phys address.
Signed-off-by: Chen Feng <puck.chen@xxxxxxxxxxxxx>
---
drivers/iommu/Kconfig | 11 +
drivers/iommu/Makefile | 1 +
drivers/iommu/hi6220_iommu.c | 492 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 504 insertions(+)
create mode 100644 drivers/iommu/hi6220_iommu.c
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index b9094e9..7c13521 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -84,6 +84,17 @@ config IOMMU_PGTABLES_L2
def_bool y
depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
+config HI6220_IOMMU
+ bool "Hi6220 IOMMU Support"
+ depends on ARM64
+ select IOMMU_API
+ select IOMMU_IOVA
+ help
+ Enable IOMMU Driver for hi6220 SoC. The IOMMU API and IOMMU IOVA
+ is also selected.
+
+ If unsure, say N.
+
# AMD IOMMU support
config AMD_IOMMU
bool "AMD IOMMU support"
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 68faca02..cdb2b83 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
obj-$(CONFIG_DMAR_TABLE) += dmar.o
+obj-$(CONFIG_HI6220_IOMMU) += hi6220_iommu.o
obj-$(CONFIG_INTEL_IOMMU) += intel-iommu.o
obj-$(CONFIG_INTEL_IOMMU_SVM) += intel-svm.o
obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
diff --git a/drivers/iommu/hi6220_iommu.c b/drivers/iommu/hi6220_iommu.c
new file mode 100644
index 0000000..a546d43
--- /dev/null
+++ b/drivers/iommu/hi6220_iommu.c
@@ -0,0 +1,492 @@
+/*
+ * Hisilicon Hi6220 IOMMU driver
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * Author: Chen Feng <puck.chen@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) "IOMMU: " fmt
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/irq.h>
+#include <linux/iova.h>
+#include <linux/iopoll.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sizes.h>
+
+#define SMMU_CTRL_OFFSET (0x0000)
+#define SMMU_ENABLE_OFFSET (0x0004)
+#define SMMU_PTBR_OFFSET (0x0008)
+#define SMMU_START_OFFSET (0x000C)
+#define SMMU_END_OFFSET (0x0010)
+#define SMMU_INTMASK_OFFSET (0x0014)
+#define SMMU_RINTSTS_OFFSET (0x0018)
+#define SMMU_MINTSTS_OFFSET (0x001C)
+#define SMMU_INTCLR_OFFSET (0x0020)
+#define SMMU_STATUS_OFFSET (0x0024)
+#define SMMU_AXIID_OFFSET (0x0028)
+#define SMMU_CNTCTRL_OFFSET (0x002C)
+#define SMMU_TRANSCNT_OFFSET (0x0030)
+#define SMMU_L0TLBHITCNT_OFFSET (0x0034)
+#define SMMU_L1TLBHITCNT_OFFSET (0x0038)
+#define SMMU_WRAPCNT_OFFSET (0x003C)
+#define SMMU_SEC_START_OFFSET (0x0040)
+#define SMMU_SEC_END_OFFSET (0x0044)
+#define SMMU_VERSION_OFFSET (0x0048)
+#define SMMU_IPTSRC_OFFSET (0x004C)
+#define SMMU_IPTPA_OFFSET (0x0050)
+#define SMMU_TRBA_OFFSET (0x0054)
+#define SMMU_BYS_START_OFFSET (0x0058)
+#define SMMU_BYS_END_OFFSET (0x005C)
+#define SMMU_RAM_OFFSET (0x1000)
+
+#define SMMU_CTRL_INVALID (BIT(10))
+#define SMMU_SR_REGS_NUM (15)
+#define SMMU_REGS_SGMT_END (0x60)
+#define PAGE_ENTRY_VALID (0x1)
+#define IOPAGE_SHIFT (12)
+#define IOVA_PFN(addr) ((addr) >> IOPAGE_SHIFT)
+#define IOVA_PAGE_SZ (SZ_4K)
+
+/**
+ * The iova address from 0 ~ 2G
+ */
+#define IOVA_START (0x0)
+#define IOVA_END (0x80000000)
+
+struct hi6220_smmu {
+ unsigned int irq;
+ void __iomem *reg_base;
+ struct clk *smmu_peri_clk;
+ struct clk *smmu_clk;
+ struct clk *media_sc_clk;
+ spinlock_t spinlock; /*spinlock for tlb invalid*/
+ dma_addr_t pgtable_phy;
+ void *pgtable_virt;
+ u32 pgtable_size;
+ u32 *sr_data;
+};
+
+struct hi6220_domain {
+ struct hi6220_smmu *smmu_dev;
+ struct iommu_domain io_domain;
+};
+
+static struct hi6220_smmu *smmu_dev_handle;
+static struct iova_domain iova_allocator;
+
+static struct hi6220_domain *to_hi6220_domain(struct iommu_domain *dom)
+{
+ return container_of(dom, struct hi6220_domain, io_domain);
+}
+
+static inline void __smmu_writel(struct hi6220_smmu *smmu_dev, u32 value,
+ unsigned long offset)
+{
+ writel(value, smmu_dev->reg_base + offset);
+}
+
+static inline u32 __smmu_readl(struct hi6220_smmu *smmu_dev,
+ unsigned long offset)
+{
+ return readl(smmu_dev->reg_base + offset);
+}
+
+/**
+ * store and load the regs
+ */
+static void __store_regs(struct hi6220_smmu *smmu_dev)
+{
+ int i;
+ u32 *data = smmu_dev->sr_data;
+
+ for (i = 0; i < SMMU_SR_REGS_NUM; i++)
+ data[i] = __smmu_readl(smmu_dev, i * 4);
+}
+
+static void __load_regs(struct hi6220_smmu *smmu_dev)
+{
+ int i;
+ u32 *data = smmu_dev->sr_data;
+
+ for (i = 0; i < SMMU_SR_REGS_NUM; i++)
+ __smmu_writel(smmu_dev, data[i], i * 4);
+}
+
+static inline void __set_smmu_pte(unsigned int *pte,
+ dma_addr_t phys_addr)
+{
+ if ((*pte & PAGE_ENTRY_VALID))
+ pr_err("set pte[%p]->%x already set!\n", pte, *pte);
+
+ *pte = (unsigned int)(phys_addr | PAGE_ENTRY_VALID);
+}
+
+static inline void __clear_smmu_pte(unsigned int *pte)
+{
+ if (!(*pte & PAGE_ENTRY_VALID))
+ pr_err("clear pte[%p] %x err!\n", pte, *pte);
+
+ *pte = 0;
+}
+
+static inline int __invalid_smmu_tlb(struct hi6220_domain *m_domain,
+ unsigned long iova, size_t size)
+{
+ unsigned long flags;
+ unsigned int smmu_ctrl = 0;
+ unsigned int start_pfn = 0;
+ unsigned int end_pfn = 0;
+ unsigned int tmp;
+ int ret;
+ void __iomem *reg_base;
+ struct hi6220_smmu *smmu_dev = m_domain->smmu_dev;
+ dma_addr_t smmu_pgtbl_phy = m_domain->smmu_dev->pgtable_phy;
+
+ reg_base = smmu_dev->reg_base;
+ start_pfn = IOVA_PFN(iova);
+ end_pfn = IOVA_PFN(iova + size);
+
+ spin_lock_irqsave(&smmu_dev->spinlock, flags);
+ __smmu_writel(smmu_dev, smmu_pgtbl_phy + start_pfn * sizeof(int),
+ SMMU_START_OFFSET);
+ __smmu_writel(smmu_dev, smmu_pgtbl_phy + end_pfn * sizeof(int),
+ SMMU_END_OFFSET);
+
+ smmu_ctrl = __smmu_readl(smmu_dev, SMMU_CTRL_OFFSET);
+ smmu_ctrl = smmu_ctrl | SMMU_CTRL_INVALID;
+ __smmu_writel(smmu_dev, smmu_ctrl, SMMU_CTRL_OFFSET);
+ spin_unlock_irqrestore(&smmu_dev->spinlock, flags);
+
+ ret = readl_poll_timeout_atomic(reg_base + SMMU_CNTCTRL_OFFSET, tmp,
+ !(tmp & SMMU_CTRL_INVALID), 5, 50);
+ if (ret) {
+ pr_err("invalid smmu tlb error!");
+ return ret;
+ }
+ return 0;
+}
+
+static int __smmu_enable(struct hi6220_smmu *smmu_dev)
+{
+ /**
+ * enable clock first
+ */
+ if (clk_prepare_enable(smmu_dev->media_sc_clk)) {
+ pr_err("clk_prepare_enable media_sc_clk is falied\n");
+ return -ENODEV;
+ }
+ if (clk_prepare_enable(smmu_dev->smmu_peri_clk)) {
+ pr_err("clk_prepare_enable smmu_peri_clk is falied\n");
+ return -ENODEV;
+ }
+ if (clk_prepare_enable(smmu_dev->smmu_clk)) {
+ pr_err("clk_prepare_enable smmu_clk is falied\n");
+ return -ENODEV;
+ }
+
+ /**
+ * load the store register when resume
+ */
+ if (smmu_dev->sr_data)
+ __load_regs(smmu_dev);
+
+ /*set axi id*/
+ __smmu_writel(smmu_dev, 0xC70000FF, SMMU_AXIID_OFFSET);
+ /*iommu page size 4K */
+ __smmu_writel(smmu_dev, 0x000001A6, SMMU_CTRL_OFFSET);
+ /*clear interrupt pa address*/
+ __smmu_writel(smmu_dev, 0x00000000, SMMU_IPTPA_OFFSET);
+ /*clear interrupt*/
+ __smmu_writel(smmu_dev, 0xFF, SMMU_INTCLR_OFFSET);
+
+ /*set page table phy_addr for ptable and preload*/
+ __smmu_writel(smmu_dev, smmu_dev->pgtable_phy, SMMU_PTBR_OFFSET);
+ __smmu_writel(smmu_dev, smmu_dev->pgtable_phy, SMMU_START_OFFSET);
+ /*set the page table memory size*/
+ __smmu_writel(smmu_dev, smmu_dev->pgtable_size, SMMU_END_OFFSET);
+ __smmu_writel(smmu_dev, 0x3, SMMU_ENABLE_OFFSET);
+
+ return 0;
+}
+
+/**
+ * interrupt happen when operator error
+ */
+static irqreturn_t hi6220_smmu_isr(int irq, void *data)
+{
+ int i;
+ int index;
+ unsigned int irq_stat;
+ struct hi6220_smmu *smmu_dev = (struct hi6220_smmu *)data;
+ unsigned int pgt = 0;
+ unsigned int pc_pgt = 0;
+
+ irq_stat = __smmu_readl(smmu_dev, SMMU_MINTSTS_OFFSET);
+
+ /**
+ * clear smmu interrupt
+ */
+ __smmu_writel(smmu_dev, 0xff, SMMU_INTCLR_OFFSET);
+ pgt = __smmu_readl(smmu_dev, SMMU_PTBR_OFFSET);
+ pc_pgt = __smmu_readl(smmu_dev, SMMU_IPTSRC_OFFSET);
+
+ /**
+ * dump key register of smmu
+ */
+ pr_err("\n irq status= %08x\n"
+ " SMMU_CTRL_OFFSET = %08x\n"
+ " SMMU_ENABLE_OFFSET = %08x\n"
+ " SMMU_PTBR_OFFSET = %08x\n"
+ " SMMU_START_OFFSET = %08x\n"
+ " SMMU_END_OFFSET = %08x\n"
+ " SMMU_IPTSRC_OFFSET = %08x\n",
+ irq_stat,
+ __smmu_readl(smmu_dev, SMMU_CTRL_OFFSET),
+ __smmu_readl(smmu_dev, SMMU_ENABLE_OFFSET),
+ __smmu_readl(smmu_dev, SMMU_PTBR_OFFSET),
+ __smmu_readl(smmu_dev, SMMU_START_OFFSET),
+ __smmu_readl(smmu_dev, SMMU_END_OFFSET),
+ __smmu_readl(smmu_dev, SMMU_IPTSRC_OFFSET));
+ /**
+ * test bit0 to bit5
+ */
+ if (irq_stat & 0x1)
+ pr_err("page_size L1 TLB_size ddr_size configure error\n");
+ if (irq_stat & BIT(1)) {
+ index = (pc_pgt - pgt) / 4;
+ pr_err("ptable entry error:IOMMU_VA=0x%x\n", index * SZ_4K);
+ }
+ if (irq_stat & BIT(2))
+ pr_err("AXI master0 receive error response\n");
+ if (irq_stat & BIT(3))
+ pr_err("AXI master1 receive error response\n");
+ if (irq_stat & BIT(4))
+ pr_err("AXI master0 access timeout\n");
+ if (irq_stat & BIT(5))
+ pr_err("AXI master1 access timeout\n");
+
+ /**
+ * dump all smmu register for error check
+ */
+ for (i = 0; i < SMMU_REGS_SGMT_END; i += 4)
+ pr_err("[%08x] ", __smmu_readl(smmu_dev, i));
+
+ return IRQ_HANDLED;
+}
+
+static struct iommu_domain *hi6220_domain_alloc(unsigned type)
+{
+ struct hi6220_domain *m_domain;
+ struct hi6220_smmu *smmu_dev;
+
+ if (type != IOMMU_DOMAIN_UNMANAGED)
+ return NULL;
+
+ smmu_dev = smmu_dev_handle;
+ if (!smmu_dev)
+ return NULL;
+
+ m_domain = kzalloc(sizeof(*m_domain), GFP_KERNEL);
+ if (!m_domain)
+ return NULL;
+
+ m_domain->smmu_dev = smmu_dev_handle;
+ m_domain->io_domain.geometry.aperture_start = IOVA_START;
+ m_domain->io_domain.geometry.aperture_end = IOVA_END;
+ m_domain->io_domain.geometry.force_aperture = true;
+
+ return &m_domain->io_domain;
+}
+
+static void hi6220_domain_free(struct iommu_domain *domain)
+{
+ struct hi6220_domain *hi6220_domain = to_hi6220_domain(domain);
+
+ kfree(hi6220_domain);
+}
+
+static int hi6220_smmu_attach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ dev->archdata.iommu = &iova_allocator;
+
+ return 0;
+}
+
+static void hi6220_smmu_detach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ dev->archdata.iommu = NULL;
+}
+
+static int hi6220_smmu_map(struct iommu_domain *domain,
+ unsigned long iova, phys_addr_t pa,
+ size_t size, int smmu_prot)
+{
+ struct hi6220_domain *m_domain = to_hi6220_domain(domain);
+ struct hi6220_smmu *smmu_dev = m_domain->smmu_dev;
+ unsigned int *page_table = (unsigned int *)smmu_dev->pgtable_virt;
+
+ __set_smmu_pte(page_table + IOVA_PFN(iova), pa);
+
+ __invalid_smmu_tlb(m_domain, iova, size);
+
+ return 0;
+}
+
+static size_t hi6220_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
+{
+ struct hi6220_domain *m_domain = to_hi6220_domain(domain);
+ struct hi6220_smmu *smmu_dev = m_domain->smmu_dev;
+ int *page_table = (unsigned int *)smmu_dev->pgtable_virt;
+
+ __clear_smmu_pte(page_table + IOVA_PFN(iova));
+
+ __invalid_smmu_tlb(m_domain, iova, size);
+
+ return IOVA_PAGE_SZ;
+}
+
+static const struct iommu_ops hi6220_smmu_ops = {
+ .domain_alloc = hi6220_domain_alloc,
+ .domain_free = hi6220_domain_free,
+ .attach_dev = hi6220_smmu_attach_dev,
+ .detach_dev = hi6220_smmu_detach_dev,
+ .map = hi6220_smmu_map,
+ .unmap = hi6220_smmu_unmap,
+ .map_sg = default_iommu_map_sg,
+ .pgsize_bitmap = IOVA_PAGE_SZ,
+};
+
+static int hi6220_smmu_probe(struct platform_device *pdev)
+{
+ int ret;
+ int irq;
+ struct hi6220_smmu *smmu_dev = NULL;
+ struct resource *res = NULL;
+
+ smmu_dev = devm_kzalloc(&pdev->dev, sizeof(*smmu_dev), GFP_KERNEL);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ smmu_dev->reg_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(smmu_dev->reg_base))
+ return PTR_ERR(smmu_dev->reg_base);
+
+ smmu_dev->pgtable_size = (IOVA_END - IOVA_START) / SZ_4K * sizeof(int);
+ smmu_dev->media_sc_clk = devm_clk_get(&pdev->dev, "media-sc");
+ smmu_dev->smmu_peri_clk = devm_clk_get(&pdev->dev, "smmu-peri");
+ smmu_dev->smmu_clk = devm_clk_get(&pdev->dev, "smmu");
+ if (IS_ERR(smmu_dev->media_sc_clk) || IS_ERR(smmu_dev->smmu_peri_clk) ||
+ IS_ERR(smmu_dev->media_sc_clk)) {
+ pr_err("clk is not ready!\n");
+ return -EINVAL;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_irq(&pdev->dev, irq, hi6220_smmu_isr, 0,
+ dev_name(&pdev->dev), smmu_dev);
+ if (ret) {
+ pr_err("Unabled to register handler of irq %d\n", irq);
+ return ret;
+ }
+
+ spin_lock_init(&smmu_dev->spinlock);
+
+ __smmu_enable(smmu_dev);
+
+ iova_cache_get();
+ init_iova_domain(&iova_allocator, IOVA_PAGE_SZ,
+ IOVA_PFN(IOVA_START), IOVA_PFN(IOVA_END));
+
+ smmu_dev->sr_data = vmalloc(sizeof(u32) * SMMU_SR_REGS_NUM);
+ if (!smmu_dev->sr_data) {
+ iova_cache_put();
+ return -ENOMEM;
+ }
+
+ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ smmu_dev->pgtable_virt = dma_zalloc_coherent(&pdev->dev,
+ smmu_dev->pgtable_size,
+ &smmu_dev->pgtable_phy,
+ GFP_KERNEL);
+
+ if (!smmu_dev->pgtable_virt) {
+ pr_err("alloc pagetable mem failed\n");
+ vfree(smmu_dev->sr_data);
+ iova_cache_put();
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, smmu_dev);
+ bus_set_iommu(&platform_bus_type, &hi6220_smmu_ops);
+ smmu_dev_handle = smmu_dev;
+
+ return 0;
+}
+
+static int hi6220_smmu_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct hi6220_smmu *smmu_dev = dev_get_drvdata(&pdev->dev);
+
+ __store_regs(smmu_dev);
+
+ if (smmu_dev->smmu_clk)
+ clk_disable_unprepare(smmu_dev->smmu_clk);
+ if (smmu_dev->media_sc_clk)
+ clk_disable_unprepare(smmu_dev->media_sc_clk);
+ if (smmu_dev->smmu_peri_clk)
+ clk_disable_unprepare(smmu_dev->smmu_peri_clk);
+
+ return 0;
+}
+
+static int hi6220_smmu_resume(struct platform_device *pdev)
+{
+ struct hi6220_smmu *smmu_dev = dev_get_drvdata(&pdev->dev);
+
+ __smmu_enable(smmu_dev);
+ return 0;
+}
+
+static const struct of_device_id of_smmu_match_tbl[] = {
+ {
+ .compatible = "hisilicon,hi6220-smmu",
+ },
+ { }
+};
+
+static struct platform_driver hi6220_smmu_driver = {
+ .driver = {
+ .name = "smmu-hi6220",
+ .of_match_table = of_smmu_match_tbl,
+ },
+ .probe = hi6220_smmu_probe,
+ .suspend = hi6220_smmu_suspend,
+ .resume = hi6220_smmu_resume,
+};
+
+static int __init hi6220_smmu_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&hi6220_smmu_driver);
+ return ret;
+}
+
+subsys_initcall(hi6220_smmu_init);
--
1.9.1
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