Message-ID: <1446022111-57263-2-git-send-email-puck.chen@hisilicon.com>
Date:	Wed, 28 Oct 2015 16:48:30 +0800
From:	Chen Feng <puck.chen@...ilicon.com>
To:	<joro@...tes.org>, <iommu@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<puck.chen@...ilicon.com>, <yudongbin@...ilicon.com>,
	<saberlily.xia@...ilicon.com>, <suzhuangluan@...ilicon.com>,
	<kong.kongxinwei@...ilicon.com>, <xuyiping@...ilicon.com>,
	<z.liuxinliang@...ilicon.com>, <puck.chen@...yun.com>,
	<weidong2@...ilicon.com>, <w.f@...wei.com>
CC:	<qijiwen@...ilicon.com>, <peter.panshilin@...ilicon.com>,
	<dan.zhao@...ilicon.com>, <linuxarm@...wei.com>
Subject: [PATCH V4 2/3] Add iommu driver for hi6220 SoC platform

iommu/hisilicon: Add hi6220-SoC smmu driver

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@...ilicon.com>
Signed-off-by: Yu Dongbin <yudongbin@...ilicon.com>
---
 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 cbe6a89..6ca24db 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -342,6 +342,17 @@ config SPAPR_TCE_IOMMU
 	  Enables bits of IOMMU API required by VFIO. The iommu_ops
 	  is not implemented as it is not necessary for VFIO.
 
+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.
+
 # ARM IOMMU support
 config ARM_SMMU
 	bool "ARM Ltd. System MMU (SMMU) Support"
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index c6dcc51..db68fb3 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -11,6 +11,7 @@ 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-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
 obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
diff --git a/drivers/iommu/hi6220_iommu.c b/drivers/iommu/hi6220_iommu.c
new file mode 100644
index 0000000..47eb390
--- /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@...ilicon.com>
+ *
+ * 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/err.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/sizes.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_runtime.h>
+#include <linux/iova.h>
+#include <linux/iopoll.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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