--- /dev/null
+/* linux/drivers/iommu/exynos_iommu.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.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.
+ */
+
+#ifdef CONFIG_EXYNOS_IOMMU_DEBUG
+#define DEBUG
+#endif
+
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/mm.h>
+#include <linux/iommu.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/memblock.h>
+#include <linux/export.h>
+
+#include <asm/cacheflush.h>
+#include <asm/pgtable.h>
+
+#include <mach/sysmmu.h>
+
+/* We does not consider super section mapping (16MB) */
+#define SECT_ORDER 20
+#define LPAGE_ORDER 16
+#define SPAGE_ORDER 12
+
+#define SECT_SIZE (1 << SECT_ORDER)
+#define LPAGE_SIZE (1 << LPAGE_ORDER)
+#define SPAGE_SIZE (1 << SPAGE_ORDER)
+
+#define SECT_MASK (~(SECT_SIZE - 1))
+#define LPAGE_MASK (~(LPAGE_SIZE - 1))
+#define SPAGE_MASK (~(SPAGE_SIZE - 1))
+
+#define lv1ent_fault(sent) (((*(sent) & 3) == 0) || ((*(sent) & 3) == 3))
+#define lv1ent_page(sent) ((*(sent) & 3) == 1)
+#define lv1ent_section(sent) ((*(sent) & 3) == 2)
+
+#define lv2ent_fault(pent) ((*(pent) & 3) == 0)
+#define lv2ent_small(pent) ((*(pent) & 2) == 2)
+#define lv2ent_large(pent) ((*(pent) & 3) == 1)
+
+#define section_phys(sent) (*(sent) & SECT_MASK)
+#define section_offs(iova) ((iova) & 0xFFFFF)
+#define lpage_phys(pent) (*(pent) & LPAGE_MASK)
+#define lpage_offs(iova) ((iova) & 0xFFFF)
+#define spage_phys(pent) (*(pent) & SPAGE_MASK)
+#define spage_offs(iova) ((iova) & 0xFFF)
+
+#define lv1ent_offset(iova) ((iova) >> SECT_ORDER)
+#define lv2ent_offset(iova) (((iova) & 0xFF000) >> SPAGE_ORDER)
+
+#define NUM_LV1ENTRIES 4096
+#define NUM_LV2ENTRIES 256
+
+#define LV2TABLE_SIZE (NUM_LV2ENTRIES * sizeof(long))
+
+#define SPAGES_PER_LPAGE (LPAGE_SIZE / SPAGE_SIZE)
+
+#define lv2table_base(sent) (*(sent) & 0xFFFFFC00)
+
+#define mk_lv1ent_sect(pa) ((pa) | 2)
+#define mk_lv1ent_page(pa) ((pa) | 1)
+#define mk_lv2ent_lpage(pa) ((pa) | 1)
+#define mk_lv2ent_spage(pa) ((pa) | 2)
+
+#define CTRL_ENABLE 0x5
+#define CTRL_BLOCK 0x7
+#define CTRL_DISABLE 0x0
+
+#define REG_MMU_CTRL 0x000
+#define REG_MMU_CFG 0x004
+#define REG_MMU_STATUS 0x008
+#define REG_MMU_FLUSH 0x00C
+#define REG_MMU_FLUSH_ENTRY 0x010
+#define REG_PT_BASE_ADDR 0x014
+#define REG_INT_STATUS 0x018
+#define REG_INT_CLEAR 0x01C
+
+#define REG_PAGE_FAULT_ADDR 0x024
+#define REG_AW_FAULT_ADDR 0x028
+#define REG_AR_FAULT_ADDR 0x02C
+#define REG_DEFAULT_SLAVE_ADDR 0x030
+
+#define REG_MMU_VERSION 0x034
+
+#define REG_PB0_SADDR 0x04C
+#define REG_PB0_EADDR 0x050
+#define REG_PB1_SADDR 0x054
+#define REG_PB1_EADDR 0x058
+
+static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova)
+{
+ return pgtable + lv1ent_offset(iova);
+}
+
+static unsigned long *page_entry(unsigned long *sent, unsigned long iova)
+{
+ return (unsigned long *)__va(lv2table_base(sent)) + lv2ent_offset(iova);
+}
+
+enum exynos_sysmmu_inttype {
+ SYSMMU_PAGEFAULT,
+ SYSMMU_AR_MULTIHIT,
+ SYSMMU_AW_MULTIHIT,
+ SYSMMU_BUSERROR,
+ SYSMMU_AR_SECURITY,
+ SYSMMU_AR_ACCESS,
+ SYSMMU_AW_SECURITY,
+ SYSMMU_AW_PROTECTION, /* 7 */
+ SYSMMU_FAULT_UNKNOWN,
+ SYSMMU_FAULTS_NUM
+};
+
+/*
+ * @itype: type of fault.
+ * @pgtable_base: the physical address of page table base. This is 0 if @itype
+ * is SYSMMU_BUSERROR.
+ * @fault_addr: the device (virtual) address that the System MMU tried to
+ * translated. This is 0 if @itype is SYSMMU_BUSERROR.
+ */
+typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype,
+ unsigned long pgtable_base, unsigned long fault_addr);
+
+static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = {
+ REG_PAGE_FAULT_ADDR,
+ REG_AR_FAULT_ADDR,
+ REG_AW_FAULT_ADDR,
+ REG_DEFAULT_SLAVE_ADDR,
+ REG_AR_FAULT_ADDR,
+ REG_AR_FAULT_ADDR,
+ REG_AW_FAULT_ADDR,
+ REG_AW_FAULT_ADDR
+};
+
+static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
+ "PAGE FAULT",
+ "AR MULTI-HIT FAULT",
+ "AW MULTI-HIT FAULT",
+ "BUS ERROR",
+ "AR SECURITY PROTECTION FAULT",
+ "AR ACCESS PROTECTION FAULT",
+ "AW SECURITY PROTECTION FAULT",
+ "AW ACCESS PROTECTION FAULT",
+ "UNKNOWN FAULT"
+};
+
+struct exynos_iommu_domain {
+ struct list_head clients; /* list of sysmmu_drvdata.node */
+ unsigned long *pgtable; /* lv1 page table, 16KB */
+ short *lv2entcnt; /* free lv2 entry counter for each section */
+ spinlock_t lock; /* lock for this structure */
+ spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
+};
+
+struct sysmmu_drvdata {
+ struct list_head node; /* entry of exynos_iommu_domain.clients */
+ struct device *sysmmu; /* System MMU's device descriptor */
+ struct device *dev; /* Owner of system MMU */
+ char *dbgname;
+ int nsfrs;
+ void __iomem **sfrbases;
+ struct clk *clk[2];
+ int activations;
+ rwlock_t lock;
+ struct iommu_domain *domain;
+ sysmmu_fault_handler_t fault_handler;
+ unsigned long pgtable;
+};
+
+static bool set_sysmmu_active(struct sysmmu_drvdata *data)
+{
+ /* return true if the System MMU was not active previously
+ and it needs to be initialized */
+ return ++data->activations == 1;
+}
+
+static bool set_sysmmu_inactive(struct sysmmu_drvdata *data)
+{
+ /* return true if the System MMU is needed to be disabled */
+ BUG_ON(data->activations < 1);
+ return --data->activations == 0;
+}
+
+static bool is_sysmmu_active(struct sysmmu_drvdata *data)
+{
+ return data->activations > 0;
+}
+
+static void sysmmu_unblock(void __iomem *sfrbase)
+{
+ __raw_writel(CTRL_ENABLE, sfrbase + REG_MMU_CTRL);
+}
+
+static bool sysmmu_block(void __iomem *sfrbase)
+{
+ int i = 120;
+
+ __raw_writel(CTRL_BLOCK, sfrbase + REG_MMU_CTRL);
+ while ((i > 0) && !(__raw_readl(sfrbase + REG_MMU_STATUS) & 1))
+ --i;
+
+ if (!(__raw_readl(sfrbase + REG_MMU_STATUS) & 1)) {
+ sysmmu_unblock(sfrbase);
+ return false;
+ }
+
+ return true;
+}
+
+static void __sysmmu_tlb_invalidate(void __iomem *sfrbase)
+{
+ __raw_writel(0x1, sfrbase + REG_MMU_FLUSH);
+}
+
+static void __sysmmu_tlb_invalidate_entry(void __iomem *sfrbase,
+ unsigned long iova)
+{
+ __raw_writel((iova & SPAGE_MASK) | 1, sfrbase + REG_MMU_FLUSH_ENTRY);
+}
+
+static void __sysmmu_set_ptbase(void __iomem *sfrbase,
+ unsigned long pgd)
+{
+ __raw_writel(0x1, sfrbase + REG_MMU_CFG); /* 16KB LV1, LRU */
+ __raw_writel(pgd, sfrbase + REG_PT_BASE_ADDR);
+
+ __sysmmu_tlb_invalidate(sfrbase);
+}
+
+static void __sysmmu_set_prefbuf(void __iomem *sfrbase, unsigned long base,
+ unsigned long size, int idx)
+{
+ __raw_writel(base, sfrbase + REG_PB0_SADDR + idx * 8);
+ __raw_writel(size - 1 + base, sfrbase + REG_PB0_EADDR + idx * 8);
+}
+
+void exynos_sysmmu_set_prefbuf(struct device *dev,
+ unsigned long base0, unsigned long size0,
+ unsigned long base1, unsigned long size1)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+ unsigned long flags;
+ int i;
+
+ BUG_ON((base0 + size0) <= base0);
+ BUG_ON((size1 > 0) && ((base1 + size1) <= base1));
+
+ read_lock_irqsave(&data->lock, flags);
+ if (!is_sysmmu_active(data))
+ goto finish;
+
+ for (i = 0; i < data->nsfrs; i++) {
+ if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) {
+ if (!sysmmu_block(data->sfrbases[i]))
+ continue;
+
+ if (size1 == 0) {
+ if (size0 <= SZ_128K) {
+ base1 = base0;
+ size1 = size0;
+ } else {
+ size1 = size0 -
+ ALIGN(size0 / 2, SZ_64K);
+ size0 = size0 - size1;
+ base1 = base0 + size0;
+ }
+ }
+
+ __sysmmu_set_prefbuf(
+ data->sfrbases[i], base0, size0, 0);
+ __sysmmu_set_prefbuf(
+ data->sfrbases[i], base1, size1, 1);
+
+ sysmmu_unblock(data->sfrbases[i]);
+ }
+ }
+finish:
+ read_unlock_irqrestore(&data->lock, flags);
+}
+
+static void __set_fault_handler(struct sysmmu_drvdata *data,
+ sysmmu_fault_handler_t handler)
+{
+ unsigned long flags;
+
+ write_lock_irqsave(&data->lock, flags);
+ data->fault_handler = handler;
+ write_unlock_irqrestore(&data->lock, flags);
+}
+
+void exynos_sysmmu_set_fault_handler(struct device *dev,
+ sysmmu_fault_handler_t handler)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+
+ __set_fault_handler(data, handler);
+}
+
+static int default_fault_handler(enum exynos_sysmmu_inttype itype,
+ unsigned long pgtable_base, unsigned long fault_addr)
+{
+ unsigned long *ent;
+
+ if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT))
+ itype = SYSMMU_FAULT_UNKNOWN;
+
+ pr_err("%s occured at 0x%lx(Page table base: 0x%lx)\n",
+ sysmmu_fault_name[itype], fault_addr, pgtable_base);
+
+ ent = section_entry(__va(pgtable_base), fault_addr);
+ pr_err("\tLv1 entry: 0x%lx\n", *ent);
+
+ if (lv1ent_page(ent)) {
+ ent = page_entry(ent, fault_addr);
+ pr_err("\t Lv2 entry: 0x%lx\n", *ent);
+ }
+
+ pr_err("Generating Kernel OOPS... because it is unrecoverable.\n");
+
+ BUG();
+
+ return 0;
+}
+
+static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
+{
+ /* SYSMMU is in blocked when interrupt occurred. */
+ struct sysmmu_drvdata *data = dev_id;
+ struct resource *irqres;
+ struct platform_device *pdev;
+ enum exynos_sysmmu_inttype itype;
+ unsigned long addr = -1;
+
+ int i, ret = -ENOSYS;
+
+ read_lock(&data->lock);
+
+ WARN_ON(!is_sysmmu_active(data));
+
+ pdev = to_platform_device(data->sysmmu);
+ for (i = 0; i < (pdev->num_resources / 2); i++) {
+ irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i);
+ if (irqres && ((int)irqres->start == irq))
+ break;
+ }
+
+ if (i == pdev->num_resources) {
+ itype = SYSMMU_FAULT_UNKNOWN;
+ } else {
+ itype = (enum exynos_sysmmu_inttype)
+ __ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS));
+ if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN))))
+ itype = SYSMMU_FAULT_UNKNOWN;
+ else
+ addr = __raw_readl(
+ data->sfrbases[i] + fault_reg_offset[itype]);
+ }
+
+ if (data->domain)
+ ret = report_iommu_fault(data->domain, data->dev,
+ addr, itype);
+
+ if ((ret == -ENOSYS) && data->fault_handler) {
+ unsigned long base = data->pgtable;
+ if (itype != SYSMMU_FAULT_UNKNOWN)
+ base = __raw_readl(
+ data->sfrbases[i] + REG_PT_BASE_ADDR);
+ ret = data->fault_handler(itype, base, addr);
+ }
+
+ if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
+ __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR);
+ else
+ dev_dbg(data->sysmmu, "(%s) %s is not handled.\n",
+ data->dbgname, sysmmu_fault_name[itype]);
+
+ if (itype != SYSMMU_FAULT_UNKNOWN)
+ sysmmu_unblock(data->sfrbases[i]);
+
+ read_unlock(&data->lock);
+
+ return IRQ_HANDLED;
+}
+
+static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
+{
+ unsigned long flags;
+ bool disabled = false;
+ int i;
+
+ write_lock_irqsave(&data->lock, flags);
+
+ if (!set_sysmmu_inactive(data))
+ goto finish;
+
+ for (i = 0; i < data->nsfrs; i++)
+ __raw_writel(CTRL_DISABLE, data->sfrbases[i] + REG_MMU_CTRL);
+
+ if (data->clk[1])
+ clk_disable(data->clk[1]);
+ if (data->clk[0])
+ clk_disable(data->clk[0]);
+
+ disabled = true;
+ data->pgtable = 0;
+ data->domain = NULL;
+finish:
+ write_unlock_irqrestore(&data->lock, flags);
+
+ if (disabled)
+ dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname);
+ else
+ dev_dbg(data->sysmmu, "(%s) %d times left to be disabled\n",
+ data->dbgname, data->activations);
+
+ return disabled;
+}
+
+/* __exynos_sysmmu_enable: Enables System MMU
+ *
+ * returns -error if an error occurred and System MMU is not enabled,
+ * 0 if the System MMU has been just enabled and 1 if System MMU was already
+ * enabled before.
+ */
+static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
+ unsigned long pgtable, struct iommu_domain *domain)
+{
+ int i, ret = 0;
+ unsigned long flags;
+
+ write_lock_irqsave(&data->lock, flags);
+
+ if (!set_sysmmu_active(data)) {
+ if (WARN_ON(pgtable != data->pgtable)) {
+ ret = -EBUSY;
+ set_sysmmu_inactive(data);
+ } else {
+ ret = 1;
+ }
+
+ dev_dbg(data->sysmmu, "(%s) Already enabled\n", data->dbgname);
+ goto finish;
+ }
+
+ if (data->clk[0])
+ clk_enable(data->clk[0]);
+ if (data->clk[1])
+ clk_enable(data->clk[1]);
+
+ data->pgtable = pgtable;
+
+ for (i = 0; i < data->nsfrs; i++) {
+ __sysmmu_set_ptbase(data->sfrbases[i], pgtable);
+
+ if ((readl(data->sfrbases[i] + REG_MMU_VERSION) >> 28) == 3) {
+ /* System MMU version is 3.x */
+ __raw_writel((1 << 12) | (2 << 28),
+ data->sfrbases[i] + REG_MMU_CFG);
+ __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 0);
+ __sysmmu_set_prefbuf(data->sfrbases[i], 0, -1, 1);
+ }
+
+ __raw_writel(CTRL_ENABLE, data->sfrbases[i] + REG_MMU_CTRL);
+ }
+
+ data->domain = domain;
+
+ dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname);
+finish:
+ write_unlock_irqrestore(&data->lock, flags);
+
+ return ret;
+}
+
+int exynos_sysmmu_enable(struct device *dev, unsigned long pgtable)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+ int ret;
+
+ BUG_ON(!memblock_is_memory(pgtable));
+
+ ret = pm_runtime_get_sync(data->sysmmu);
+ if (ret < 0) {
+ dev_dbg(data->sysmmu, "(%s) Failed to enable\n", data->dbgname);
+ return ret;
+ }
+
+ ret = __exynos_sysmmu_enable(data, pgtable, NULL);
+ if (WARN_ON(ret < 0)) {
+ pm_runtime_put(data->sysmmu);
+ dev_err(data->sysmmu,
+ "(%s) Already enabled with page table %#lx\n",
+ data->dbgname, data->pgtable);
+ } else {
+ data->dev = dev;
+ }
+
+ return ret;
+}
+
+bool exynos_sysmmu_disable(struct device *dev)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+ bool disabled;
+
+ disabled = __exynos_sysmmu_disable(data);
+ pm_runtime_put(data->sysmmu);
+
+ return disabled;
+}
+
+static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
+{
+ unsigned long flags;
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+
+ read_lock_irqsave(&data->lock, flags);
+
+ if (is_sysmmu_active(data)) {
+ int i;
+ for (i = 0; i < data->nsfrs; i++) {
+ if (sysmmu_block(data->sfrbases[i])) {
+ __sysmmu_tlb_invalidate_entry(
+ data->sfrbases[i], iova);
+ sysmmu_unblock(data->sfrbases[i]);
+ }
+ }
+ } else {
+ dev_dbg(data->sysmmu,
+ "(%s) Disabled. Skipping invalidating TLB.\n",
+ data->dbgname);
+ }
+
+ read_unlock_irqrestore(&data->lock, flags);
+}
+
+void exynos_sysmmu_tlb_invalidate(struct device *dev)
+{
+ unsigned long flags;
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+
+ read_lock_irqsave(&data->lock, flags);
+
+ if (is_sysmmu_active(data)) {
+ int i;
+ for (i = 0; i < data->nsfrs; i++) {
+ if (sysmmu_block(data->sfrbases[i])) {
+ __sysmmu_tlb_invalidate(data->sfrbases[i]);
+ sysmmu_unblock(data->sfrbases[i]);
+ }
+ }
+ } else {
+ dev_dbg(data->sysmmu,
+ "(%s) Disabled. Skipping invalidating TLB.\n",
+ data->dbgname);
+ }
+
+ read_unlock_irqrestore(&data->lock, flags);
+}
+
+static int exynos_sysmmu_probe(struct platform_device *pdev)
+{
+ int i, ret;
+ struct device *dev;
+ struct sysmmu_drvdata *data;
+
+ dev = &pdev->dev;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ dev_dbg(dev, "Not enough memory\n");
+ ret = -ENOMEM;
+ goto err_alloc;
+ }
+
+ ret = dev_set_drvdata(dev, data);
+ if (ret) {
+ dev_dbg(dev, "Unabled to initialize driver data\n");
+ goto err_init;
+ }
+
+ data->nsfrs = pdev->num_resources / 2;
+ data->sfrbases = kmalloc(sizeof(*data->sfrbases) * data->nsfrs,
+ GFP_KERNEL);
+ if (data->sfrbases == NULL) {
+ dev_dbg(dev, "Not enough memory\n");
+ ret = -ENOMEM;
+ goto err_init;
+ }
+
+ for (i = 0; i < data->nsfrs; i++) {
+ struct resource *res;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res) {
+ dev_dbg(dev, "Unable to find IOMEM region\n");
+ ret = -ENOENT;
+ goto err_res;
+ }
+
+ data->sfrbases[i] = ioremap(res->start, resource_size(res));
+ if (!data->sfrbases[i]) {
+ dev_dbg(dev, "Unable to map IOMEM @ PA:%#x\n",
+ res->start);
+ ret = -ENOENT;
+ goto err_res;
+ }
+ }
+
+ for (i = 0; i < data->nsfrs; i++) {
+ ret = platform_get_irq(pdev, i);
+ if (ret <= 0) {
+ dev_dbg(dev, "Unable to find IRQ resource\n");
+ goto err_irq;
+ }
+
+ ret = request_irq(ret, exynos_sysmmu_irq, 0,
+ dev_name(dev), data);
+ if (ret) {
+ dev_dbg(dev, "Unabled to register interrupt handler\n");
+ goto err_irq;
+ }
+ }
+
+ if (dev_get_platdata(dev)) {
+ char *deli, *beg;
+ struct sysmmu_platform_data *platdata = dev_get_platdata(dev);
+
+ beg = platdata->clockname;
+
+ for (deli = beg; (*deli != '\0') && (*deli != ','); deli++)
+ /* NOTHING */;
+
+ if (*deli == '\0')
+ deli = NULL;
+ else
+ *deli = '\0';
+
+ data->clk[0] = clk_get(dev, beg);
+ if (IS_ERR(data->clk[0])) {
+ data->clk[0] = NULL;
+ dev_dbg(dev, "No clock descriptor registered\n");
+ }
+
+ if (data->clk[0] && deli) {
+ *deli = ',';
+ data->clk[1] = clk_get(dev, deli + 1);
+ if (IS_ERR(data->clk[1]))
+ data->clk[1] = NULL;
+ }
+
+ data->dbgname = platdata->dbgname;
+ }
+
+ data->sysmmu = dev;
+ rwlock_init(&data->lock);
+ INIT_LIST_HEAD(&data->node);
+
+ __set_fault_handler(data, &default_fault_handler);
+
+ if (dev->parent)
+ pm_runtime_enable(dev);
+
+ dev_dbg(dev, "(%s) Initialized\n", data->dbgname);
+ return 0;
+err_irq:
+ while (i-- > 0) {
+ int irq;
+
+ irq = platform_get_irq(pdev, i);
+ free_irq(irq, data);
+ }
+err_res:
+ while (data->nsfrs-- > 0)
+ iounmap(data->sfrbases[data->nsfrs]);
+ kfree(data->sfrbases);
+err_init:
+ kfree(data);
+err_alloc:
+ dev_err(dev, "Failed to initialize\n");
+ return ret;
+}
+
+static struct platform_driver exynos_sysmmu_driver = {
+ .probe = exynos_sysmmu_probe,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "exynos-sysmmu",
+ }
+};
+
+static inline void pgtable_flush(void *vastart, void *vaend)
+{
+ dmac_flush_range(vastart, vaend);
+ outer_flush_range(virt_to_phys(vastart),
+ virt_to_phys(vaend));
+}
+
+static int exynos_iommu_domain_init(struct iommu_domain *domain)
+{
+ struct exynos_iommu_domain *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->pgtable = (unsigned long *)__get_free_pages(
+ GFP_KERNEL | __GFP_ZERO, 2);
+ if (!priv->pgtable)
+ goto err_pgtable;
+
+ priv->lv2entcnt = (short *)__get_free_pages(
+ GFP_KERNEL | __GFP_ZERO, 1);
+ if (!priv->lv2entcnt)
+ goto err_counter;
+
+ pgtable_flush(priv->pgtable, priv->pgtable + NUM_LV1ENTRIES);
+
+ spin_lock_init(&priv->lock);
+ spin_lock_init(&priv->pgtablelock);
+ INIT_LIST_HEAD(&priv->clients);
+
+ domain->priv = priv;
+ return 0;
+
+err_counter:
+ free_pages((unsigned long)priv->pgtable, 2);
+err_pgtable:
+ kfree(priv);
+ return -ENOMEM;
+}
+
+static void exynos_iommu_domain_destroy(struct iommu_domain *domain)
+{
+ struct exynos_iommu_domain *priv = domain->priv;
+ struct sysmmu_drvdata *data;
+ unsigned long flags;
+ int i;
+
+ WARN_ON(!list_empty(&priv->clients));
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ list_for_each_entry(data, &priv->clients, node) {
+ while (!exynos_sysmmu_disable(data->dev))
+ ; /* until System MMU is actually disabled */
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ for (i = 0; i < NUM_LV1ENTRIES; i++)
+ if (lv1ent_page(priv->pgtable + i))
+ kfree(__va(lv2table_base(priv->pgtable + i)));
+
+ free_pages((unsigned long)priv->pgtable, 2);
+ free_pages((unsigned long)priv->lv2entcnt, 1);
+ kfree(domain->priv);
+ domain->priv = NULL;
+}
+
+static int exynos_iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+ struct exynos_iommu_domain *priv = domain->priv;
+ unsigned long flags;
+ int ret;
+
+ ret = pm_runtime_get_sync(data->sysmmu);
+ if (ret < 0)
+ return ret;
+
+ ret = 0;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ ret = __exynos_sysmmu_enable(data, __pa(priv->pgtable), domain);
+
+ if (ret == 0) {
+ /* 'data->node' must not be appeared in priv->clients */
+ BUG_ON(!list_empty(&data->node));
+ data->dev = dev;
+ list_add_tail(&data->node, &priv->clients);
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (ret < 0) {
+ dev_err(dev, "%s: Failed to attach IOMMU with pgtable %#lx\n",
+ __func__, __pa(priv->pgtable));
+ pm_runtime_put(data->sysmmu);
+ } else if (ret > 0) {
+ dev_dbg(dev, "%s: IOMMU with pgtable 0x%lx already attached\n",
+ __func__, __pa(priv->pgtable));
+ } else {
+ dev_dbg(dev, "%s: Attached new IOMMU with pgtable 0x%lx\n",
+ __func__, __pa(priv->pgtable));
+ }
+
+ return ret;
+}
+
+static void exynos_iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
+ struct exynos_iommu_domain *priv = domain->priv;
+ struct list_head *pos;
+ unsigned long flags;
+ bool found = false;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ list_for_each(pos, &priv->clients) {
+ if (list_entry(pos, struct sysmmu_drvdata, node) == data) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found)
+ goto finish;
+
+ if (__exynos_sysmmu_disable(data)) {
+ dev_dbg(dev, "%s: Detached IOMMU with pgtable %#lx\n",
+ __func__, __pa(priv->pgtable));
+ list_del(&data->node);
+ INIT_LIST_HEAD(&data->node);
+
+ } else {
+ dev_dbg(dev, "%s: Detaching IOMMU with pgtable %#lx delayed",
+ __func__, __pa(priv->pgtable));
+ }
+
+finish:
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (found)
+ pm_runtime_put(data->sysmmu);
+}
+
+static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova,
+ short *pgcounter)
+{
+ if (lv1ent_fault(sent)) {
+ unsigned long *pent;
+
+ pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC);
+ BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1));
+ if (!pent)
+ return NULL;
+
+ *sent = mk_lv1ent_page(__pa(pent));
+ *pgcounter = NUM_LV2ENTRIES;
+ pgtable_flush(pent, pent + NUM_LV2ENTRIES);
+ pgtable_flush(sent, sent + 1);
+ }
+
+ return page_entry(sent, iova);
+}
+
+static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt)
+{
+ if (lv1ent_section(sent))
+ return -EADDRINUSE;
+
+ if (lv1ent_page(sent)) {
+ if (*pgcnt != NUM_LV2ENTRIES)
+ return -EADDRINUSE;
+
+ kfree(page_entry(sent, 0));
+
+ *pgcnt = 0;
+ }
+
+ *sent = mk_lv1ent_sect(paddr);
+
+ pgtable_flush(sent, sent + 1);
+
+ return 0;
+}
+
+static int lv2set_page(unsigned long *pent, phys_addr_t paddr, size_t size,
+ short *pgcnt)
+{
+ if (size == SPAGE_SIZE) {
+ if (!lv2ent_fault(pent))
+ return -EADDRINUSE;
+
+ *pent = mk_lv2ent_spage(paddr);
+ pgtable_flush(pent, pent + 1);
+ *pgcnt -= 1;
+ } else { /* size == LPAGE_SIZE */
+ int i;
+ for (i = 0; i < SPAGES_PER_LPAGE; i++, pent++) {
+ if (!lv2ent_fault(pent)) {
+ memset(pent, 0, sizeof(*pent) * i);
+ return -EADDRINUSE;
+ }
+
+ *pent = mk_lv2ent_lpage(paddr);
+ }
+ pgtable_flush(pent - SPAGES_PER_LPAGE, pent);
+ *pgcnt -= SPAGES_PER_LPAGE;
+ }
+
+ return 0;
+}
+
+static int exynos_iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot)
+{
+ struct exynos_iommu_domain *priv = domain->priv;
+ unsigned long *entry;
+ unsigned long flags;
+ int ret = -ENOMEM;
+
+ BUG_ON(priv->pgtable == NULL);
+
+ spin_lock_irqsave(&priv->pgtablelock, flags);
+
+ entry = section_entry(priv->pgtable, iova);
+
+ if (size == SECT_SIZE) {
+ ret = lv1set_section(entry, paddr,
+ &priv->lv2entcnt[lv1ent_offset(iova)]);
+ } else {
+ unsigned long *pent;
+
+ pent = alloc_lv2entry(entry, iova,
+ &priv->lv2entcnt[lv1ent_offset(iova)]);
+
+ if (!pent)
+ ret = -ENOMEM;
+ else
+ ret = lv2set_page(pent, paddr, size,
+ &priv->lv2entcnt[lv1ent_offset(iova)]);
+ }
+
+ if (ret) {
+ pr_debug("%s: Failed to map iova 0x%lx/0x%x bytes\n",
+ __func__, iova, size);
+ }
+
+ spin_unlock_irqrestore(&priv->pgtablelock, flags);
+
+ return ret;
+}
+
+static size_t exynos_iommu_unmap(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
+{
+ struct exynos_iommu_domain *priv = domain->priv;
+ struct sysmmu_drvdata *data;
+ unsigned long flags;
+ unsigned long *ent;
+
+ BUG_ON(priv->pgtable == NULL);
+
+ spin_lock_irqsave(&priv->pgtablelock, flags);
+
+ ent = section_entry(priv->pgtable, iova);
+
+ if (lv1ent_section(ent)) {
+ BUG_ON(size < SECT_SIZE);
+
+ *ent = 0;
+ pgtable_flush(ent, ent + 1);
+ size = SECT_SIZE;
+ goto done;
+ }
+
+ if (unlikely(lv1ent_fault(ent))) {
+ if (size > SECT_SIZE)
+ size = SECT_SIZE;
+ goto done;
+ }
+
+ /* lv1ent_page(sent) == true here */
+
+ ent = page_entry(ent, iova);
+
+ if (unlikely(lv2ent_fault(ent))) {
+ size = SPAGE_SIZE;
+ goto done;
+ }
+
+ if (lv2ent_small(ent)) {
+ *ent = 0;
+ size = SPAGE_SIZE;
+ priv->lv2entcnt[lv1ent_offset(iova)] += 1;
+ goto done;
+ }
+
+ /* lv1ent_large(ent) == true here */
+ BUG_ON(size < LPAGE_SIZE);
+
+ memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
+
+ size = LPAGE_SIZE;
+ priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;
+done:
+ spin_unlock_irqrestore(&priv->pgtablelock, flags);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ list_for_each_entry(data, &priv->clients, node)
+ sysmmu_tlb_invalidate_entry(data->dev, iova);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+
+ return size;
+}
+
+static phys_addr_t exynos_iommu_iova_to_phys(struct iommu_domain *domain,
+ unsigned long iova)
+{
+ struct exynos_iommu_domain *priv = domain->priv;
+ unsigned long *entry;
+ unsigned long flags;
+ phys_addr_t phys = 0;
+
+ spin_lock_irqsave(&priv->pgtablelock, flags);
+
+ entry = section_entry(priv->pgtable, iova);
+
+ if (lv1ent_section(entry)) {
+ phys = section_phys(entry) + section_offs(iova);
+ } else if (lv1ent_page(entry)) {
+ entry = page_entry(entry, iova);
+
+ if (lv2ent_large(entry))
+ phys = lpage_phys(entry) + lpage_offs(iova);
+ else if (lv2ent_small(entry))
+ phys = spage_phys(entry) + spage_offs(iova);
+ }
+
+ spin_unlock_irqrestore(&priv->pgtablelock, flags);
+
+ return phys;
+}
+
+static struct iommu_ops exynos_iommu_ops = {
+ .domain_init = &exynos_iommu_domain_init,
+ .domain_destroy = &exynos_iommu_domain_destroy,
+ .attach_dev = &exynos_iommu_attach_device,
+ .detach_dev = &exynos_iommu_detach_device,
+ .map = &exynos_iommu_map,
+ .unmap = &exynos_iommu_unmap,
+ .iova_to_phys = &exynos_iommu_iova_to_phys,
+ .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
+};
+
+static int __init exynos_iommu_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&exynos_sysmmu_driver);
+
+ if (ret == 0)
+ bus_set_iommu(&platform_bus_type, &exynos_iommu_ops);
+
+ return ret;
+}
+subsys_initcall(exynos_iommu_init);
projects / ~andy / linux / blobdiff