Implemented IOMMU API for Exynos4 platform that has IOMMU(System MMU).
The previous System MMU driver exposed its own functions and was lack
of page table management.
This patch includes complete implementation of IOMMU API
and it is capable of mapping and unmapping any number of orders.
iommu_map() for Exynos4 does not map 16MiB page because it is not
practical now. 1MiB page is sufficient for larger physically contiguous
memory mapping. Performance degradation due to TLB miss is not such a
big problem with 1MiB page.
Since archdata field of structure 'device' contains nothing in ARM,
I've used linked list to manage the relation between domain and device.
Marek is trying to add domain and dma_map_ops fields into dev_archdata.
This way of relation management will be changed after the Marek's work
is merged into the mainline.
Signed-off-by: KyongHo Cho <pullip.cho@xxxxxxxxxxx>
---
arch/arm/mach-exynos4/include/mach/sysmmu.h | 9 +-
drivers/iommu/Kconfig | 11 +
drivers/iommu/Makefile | 1 +
drivers/iommu/exynos4_sysmmu.c | 343 ++++++++++++++++++
drivers/iommu/exynos4_sysmmu.h | 18 +
drivers/iommu/exynos_iommu.c | 496 +++++++++++++++++++++++++++
6 files changed, 872 insertions(+), 6 deletions(-)
create mode 100644 drivers/iommu/exynos4_sysmmu.c
create mode 100644 drivers/iommu/exynos4_sysmmu.h
create mode 100644 drivers/iommu/exynos_iommu.c
diff --git a/arch/arm/mach-exynos4/include/mach/sysmmu.h b/arch/arm/mach-exynos4/include/mach/sysmmu.h
index 6a5fbb5..2be20c5 100644
--- a/arch/arm/mach-exynos4/include/mach/sysmmu.h
+++ b/arch/arm/mach-exynos4/include/mach/sysmmu.h
@@ -34,13 +34,10 @@ enum exynos4_sysmmu_ips {
};
#define S5P_SYSMMU_TOTAL_IPNUM EXYNOS4_SYSMMU_TOTAL_IPNUM
-
-extern const char *sysmmu_ips_name[EXYNOS4_SYSMMU_TOTAL_IPNUM];
+#define SYSMMU_NONE S5P_SYSMMU_TOTAL_IPNUM
typedef enum exynos4_sysmmu_ips sysmmu_ips;
-void sysmmu_clk_init(struct device *dev, sysmmu_ips ips);
-void sysmmu_clk_enable(sysmmu_ips ips);
-void sysmmu_clk_disable(sysmmu_ips ips);
-
+#else /* __ASM_ARM_ARCH_SYSMMU_H */
+#error mach/sysmmu.h must not be included by device drivers
#endif /* __ASM_ARM_ARCH_SYSMMU_H */
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index b57b3fa..a9fcc79 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -107,4 +107,15 @@ config INTR_REMAP
To use x2apic mode in the CPU's which support x2APIC enhancements or
to support platforms with CPU's having > 8 bit APIC ID, say Y.
+# EXYNOS IOMMU support
+config EXYNOS_IOMMU
+ bool "Exynos4 IOMMU(System MMU) Support"
+ depends on ARCH_EXYNOS4
+ select IOMMU_API
+ help
+ Support for the System MMU embedded in Samsung Exynos4 SOCs.
+ These IOMMUs allow virtualization of the address space used by most
+ cores within the multimedia subsystem.
+
+ If unsure, say N here.
endif # IOMMU_SUPPORT
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 4d4d77d..446bbdd 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o
obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
+obj-$(CONFIG_EXYNOS_IOMMU) += exynos_iommu.o exynos4_sysmmu.o
diff --git a/drivers/iommu/exynos4_sysmmu.c b/drivers/iommu/exynos4_sysmmu.c
new file mode 100644
index 0000000..01e0966
--- /dev/null
+++ b/drivers/iommu/exynos4_sysmmu.c
@@ -0,0 +1,343 @@
+/* linux/drivers/iommu/exynos4_sysmmu.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.
+ */
+
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <asm/pgtable.h>
+
+#include <mach/map.h>
+#include <mach/regs-sysmmu.h>
+
+#include "exynos4_sysmmu.h"
+
+#define CTRL_ENABLE 0x5
+#define CTRL_BLOCK 0x7
+#define CTRL_DISABLE 0x0
+
+static struct device *dev_sysmmu[S5P_SYSMMU_TOTAL_IPNUM];
+
+static void sysmmu_clk_enable(sysmmu_ips ips)
+{
+ struct clk *clk;
+
+ clk = clk_get(dev_sysmmu[ips], NULL);
+ if (clk)
+ clk_enable(clk);
+}
+
+static void sysmmu_clk_disable(sysmmu_ips ips)
+{
+ struct clk *clk;
+
+ clk = clk_get(dev_sysmmu[ips], NULL);
+ if (clk)
+ clk_disable(clk);
+}
+
+enum S5P_SYSMMU_INTERRUPT_TYPE {
+ SYSMMU_PAGEFAULT,
+ SYSMMU_AR_MULTIHIT,
+ SYSMMU_AW_MULTIHIT,
+ SYSMMU_BUSERROR,
+ SYSMMU_AR_SECURITY,
+ SYSMMU_AR_ACCESS,
+ SYSMMU_AW_SECURITY,
+ SYSMMU_AW_PROTECTION, /* 7 */
+ SYSMMU_FAULTS_NUM
+};
+
+static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = {
+ S5P_PAGE_FAULT_ADDR,
+ S5P_AR_FAULT_ADDR,
+ S5P_AW_FAULT_ADDR,
+ S5P_DEFAULT_SLAVE_ADDR,
+ S5P_AR_FAULT_ADDR,
+ S5P_AR_FAULT_ADDR,
+ S5P_AW_FAULT_ADDR,
+ S5P_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"
+};
+
+static int (*fault_handlers[S5P_SYSMMU_TOTAL_IPNUM])(
+ enum S5P_SYSMMU_INTERRUPT_TYPE itype,
+ unsigned long pgtable_base,
+ unsigned long fault_addr);
+
+/*
+ * If adjacent 2 bits are true, the system MMU is enabled.
+ * The system MMU is disabled, otherwise.
+ */
+static unsigned long sysmmu_states;
+
+static inline int set_sysmmu_active(sysmmu_ips ips)
+{
+ /* return true if it is not set */
+ return !test_and_set_bit(ips, &sysmmu_states);
+}
+
+static inline int set_sysmmu_inactive(sysmmu_ips ips)
+{
+ /* return true if it is set */
+ return test_and_clear_bit(ips, &sysmmu_states);
+}
+
+static inline int is_sysmmu_active(sysmmu_ips ips)
+{
+ /* BUG_ON(ips >= S5P_SYSMMU_TOTAL_IPNUM); */
+ return sysmmu_states & (1 << ips);
+}
+
+static void __iomem *sysmmusfrs[S5P_SYSMMU_TOTAL_IPNUM];
+
+static inline void sysmmu_block(sysmmu_ips ips)
+{
+ __raw_writel(CTRL_BLOCK, sysmmusfrs[ips] + S5P_MMU_CTRL);
+ dev_dbg(dev_sysmmu[ips], "blocked.\n");
+}
+
+static inline void sysmmu_unblock(sysmmu_ips ips)
+{
+ __raw_writel(CTRL_ENABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+ dev_dbg(dev_sysmmu[ips], "unblocked.\n");
+}
+
+static inline void __sysmmu_tlb_invalidate(sysmmu_ips ips)
+{
+ __raw_writel(0x1, sysmmusfrs[ips] + S5P_MMU_FLUSH);
+ dev_dbg(dev_sysmmu[ips], "TLB is invalidated.\n");
+}
+
+static inline void __sysmmu_set_ptbase(sysmmu_ips ips, unsigned long pgd)
+{
+ if (unlikely(pgd == 0)) {
+ pgd = (unsigned long)ZERO_PAGE(0);
+ __raw_writel(0x20, sysmmusfrs[ips] + S5P_MMU_CFG); /* 4KB LV1 */
+ } else {
+ __raw_writel(0x0, sysmmusfrs[ips] + S5P_MMU_CFG); /* 16KB LV1 */
+ }
+
+ __raw_writel(pgd, sysmmusfrs[ips] + S5P_PT_BASE_ADDR);
+
+ dev_dbg(dev_sysmmu[ips], "Page table base initialized with 0x%08lX.\n",
+ pgd);
+ __sysmmu_tlb_invalidate(ips);
+}
+
+static irqreturn_t s5p_sysmmu_irq(int irq, void *dev_id)
+{
+ /* SYSMMU is in blocked when interrupt occurred. */
+ unsigned long base = 0;
+ unsigned long addr;
+ sysmmu_ips ips = (sysmmu_ips)dev_id;
+ enum S5P_SYSMMU_INTERRUPT_TYPE itype;
+
+ BUG_ON(!is_sysmmu_active(ips));
+
+ itype = (enum S5P_SYSMMU_INTERRUPT_TYPE)
+ __ffs(__raw_readl(sysmmusfrs[ips] + S5P_INT_STATUS));
+
+ BUG_ON(!((itype >= 0) && (itype < 8)));
+
+ base = __raw_readl(sysmmusfrs[ips] + S5P_PT_BASE_ADDR);
+ addr = __raw_readl(sysmmusfrs[ips] + fault_reg_offset[itype]);
+
+ dev_alert(dev_sysmmu[ips], "%s occurred at %08lx (PT_BASE_ADDR: %08lx)."
+ "\n", sysmmu_fault_name[itype], addr, base);
+
+ if (fault_handlers[ips]) {
+
+
+ if (fault_handlers[ips](itype, base, addr)) {
+ __raw_writel(1 << itype,
+ sysmmusfrs[ips] + S5P_INT_CLEAR);
+ dev_notice(dev_sysmmu[ips], "%s is resolved. Retrying"
+ " translation.\n", sysmmu_fault_name[itype]);
+ } else {
+ base = 0;
+ }
+ }
+
+ sysmmu_unblock(ips);
+
+ if (!base)
+ dev_notice(dev_sysmmu[ips], "%s is not handled.\n",
+ sysmmu_fault_name[itype]);
+
+ return IRQ_HANDLED;
+}
+
+void s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd)
+{
+ if (is_sysmmu_active(ips)) {
+ sysmmu_block(ips);
+ __sysmmu_set_ptbase(ips, pgd);
+ sysmmu_unblock(ips);
+ } else {
+ dev_dbg(dev_sysmmu[ips], "disabled. Skipping initializing page"
+ " table base...\n");
+ }
+}
+
+void s5p_sysmmu_enable(sysmmu_ips ips, unsigned long pgd)
+{
+ if (set_sysmmu_active(ips)) {
+ sysmmu_clk_enable(ips);
+
+ __sysmmu_set_ptbase(ips, pgd);
+
+ __raw_writel(CTRL_ENABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+
+ set_sysmmu_active(ips);
+ dev_dbg(dev_sysmmu[ips], "enabled.\n");
+ } else {
+ dev_dbg(dev_sysmmu[ips], "already enabled."
+ " Skipping initialization...\n");
+ }
+}
+
+void s5p_sysmmu_disable(sysmmu_ips ips)
+{
+ if (set_sysmmu_inactive(ips)) {
+ __raw_writel(CTRL_DISABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+ sysmmu_clk_disable(ips);
+ dev_dbg(dev_sysmmu[ips], "disabled.\n");
+ } else {
+ dev_dbg(dev_sysmmu[ips], "already disabled."
+ " Skipping deinitialization...\n");
+ }
+}
+
+void s5p_sysmmu_tlb_invalidate(sysmmu_ips ips)
+{
+ if (is_sysmmu_active(ips)) {
+ sysmmu_block(ips);
+ __sysmmu_tlb_invalidate(ips);
+ sysmmu_unblock(ips);
+ } else {
+ dev_dbg(dev_sysmmu[ips], "is disabled. "
+ "Skipping invalidating TLB...\n");
+ }
+}
+
+static int s5p_sysmmu_probe(struct platform_device *pdev)
+{
+ sysmmu_ips id;
+ struct resource *res, *ioarea;
+ int ret;
+ int irq;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed probing system MMU: "
+ "failed to get resource.");
+ return -ENOENT;
+ }
+
+ id = (sysmmu_ips)pdev->id;
+
+ if (id >= S5P_SYSMMU_TOTAL_IPNUM) {
+ dev_err(&pdev->dev, "Unknown System MMU ID %d.", id);
+ return -ENOENT;
+ }
+
+ ioarea = request_mem_region(res->start, resource_size(res), pdev->name);
+ if (ioarea == NULL) {
+ dev_err(&pdev->dev, "Failed probing system MMU: "
+ "failed to request memory region.");
+ return -ENOMEM;
+ }
+
+ sysmmusfrs[id] = ioremap(res->start, resource_size(res));
+ if (!sysmmusfrs[id]) {
+ dev_err(&pdev->dev, "Failed probing system MMU: "
+ "failed to call ioremap().");
+ ret = -ENOENT;
+ goto err_ioremap;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ dev_err(&pdev->dev, "Failed probing system MMU: "
+ "failed to get irq resource.");
+ ret = irq;
+ goto err_irq;
+ }
+
+ if (request_irq(irq, s5p_sysmmu_irq, 0, dev_name(&pdev->dev),
+ (void *)id)) {
+ dev_err(&pdev->dev, "Failed probing system MMU: "
+ "failed to request irq.");
+ ret = -ENOENT;
+ goto err_irq;
+ }
+
+ dev_sysmmu[id] = &pdev->dev;
+
+ dev_dbg(&pdev->dev, "Probing system MMU succeeded.");
+ return 0;
+
+err_irq:
+ iounmap(sysmmusfrs[id]);
+err_ioremap:
+ release_resource(ioarea);
+ kfree(ioarea);
+ dev_err(&pdev->dev, "Probing system MMU failed.");
+ return ret;
+}
+
+static int s5p_sysmmu_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+static int s5p_sysmmu_runtime_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int s5p_sysmmu_runtime_resume(struct device *dev)
+{
+ return 0;
+}
+
+static const struct dev_pm_ops s5p_sysmmu_pm_ops = {
+ .runtime_suspend = s5p_sysmmu_runtime_suspend,
+ .runtime_resume = s5p_sysmmu_runtime_resume,
+};
+
+static struct platform_driver s5p_sysmmu_driver = {
+ .probe = s5p_sysmmu_probe,
+ .remove = s5p_sysmmu_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "s5p-sysmmu",
+ .pm = &s5p_sysmmu_pm_ops,
+ }
+};
+
+static int __init s5p_sysmmu_init(void)
+{
+ return platform_driver_register(&s5p_sysmmu_driver);
+}
+arch_initcall(s5p_sysmmu_init);
diff --git a/drivers/iommu/exynos4_sysmmu.h b/drivers/iommu/exynos4_sysmmu.h
new file mode 100644
index 0000000..f739240
--- /dev/null
+++ b/drivers/iommu/exynos4_sysmmu.h
@@ -0,0 +1,18 @@
+/* linux/drivers/iommu/exynos4_sysmmu.h
+ *
+ * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Samsung System MMU driver for Exynos4 platforms
+ *
+ * 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.
+*/
+
+#include <mach/sysmmu.h>
+
+void s5p_sysmmu_enable(sysmmu_ips ips, unsigned long pgd);
+void s5p_sysmmu_disable(sysmmu_ips ips);
+void s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd);
+void s5p_sysmmu_tlb_invalidate(sysmmu_ips ips);
diff --git a/drivers/iommu/exynos_iommu.c b/drivers/iommu/exynos_iommu.c
new file mode 100644
index 0000000..cbb94df
--- /dev/null
+++ b/drivers/iommu/exynos_iommu.c
@@ -0,0 +1,496 @@
+/* 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.
+ */
+
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/iommu.h>
+#include <linux/errno.h>
+#include <linux/list.h>
+
+#include <asm/cacheflush.h>
+
+#include "exynos4_sysmmu.h"
+
+#ifdef CONFIG_S5P_SYSTEM_MMU_DEBUG
+#define DEBUG /* for dev_dbg() */
+#endif
+
+/* We does not consider super section mapping (16MB) */
+#define S5P_SPAGE_SHIFT 12
+#define S5P_LPAGE_SHIFT 16
+#define S5P_SECTION_SHIFT 20
+
+#define S5P_SPAGE_SIZE (1 << S5P_SPAGE_SHIFT)
+#define S5P_LPAGE_SIZE (1 << S5P_LPAGE_SHIFT)
+#define S5P_SECTION_SIZE (1 << S5P_SECTION_SHIFT)
+
+#define S5P_SPAGE_MASK (~(S5P_SPAGE_SIZE - 1))
+#define S5P_LPAGE_MASK (~(S5P_LPAGE_SIZE - 1))
+#define S5P_SECTION_MASK (~(S5P_SECTION_SIZE - 1))
+
+#define S5P_SPAGE_ORDER (S5P_SPAGE_SHIFT - PAGE_SHIFT)
+#define S5P_LPAGE_ORDER (S5P_LPAGE_SHIFT - S5P_SPAGE_SHIFT)
+#define S5P_SECTION_ORDER (S5P_SECTION_SHIFT - S5P_SPAGE_SHIFT)
+
+#define S5P_LV1TABLE_ENTRIES (1 << (BITS_PER_LONG - S5P_SECTION_SHIFT))
+
+#define S5P_LV2TABLE_ENTRIES (1 << S5P_SECTION_ORDER)
+#define S5P_LV2TABLE_SIZE (S5P_LV2TABLE_ENTRIES * sizeof(long))
+#define S5P_LV2TABLE_MASK (~(S5P_LV2TABLE_SIZE - 1)) /* 0xFFFFFC00 */
+
+#define S5P_SECTION_LV1_ENTRY(entry) ((entry & 0x40003) == 2)
+#define S5P_SUPSECT_LV1_ENTRY(entry) ((entry & 0x40003) == 0x40002)
+#define S5P_PAGE_LV1_ENTRY(entry) ((entry & 3) == 1)
+#define S5P_FAULT_LV1_ENTRY(entry) (((entry & 3) == 0) || (entry & 3) == 3)
+
+#define S5P_LPAGE_LV2_ENTRY(entry) ((entry & 3) == 1)
+#define S5P_SPAGE_LV2_ENTRY(entry) ((entry & 2) == 2)
+#define S5P_FAULT_LV2_ENTRY(entry) ((entry & 3) == 0)
+
+#define MAKE_FAULT_ENTRY(entry) do { entry = 0; } while (0)
+#define MAKE_SECTION_ENTRY(entry, pa) do { entry = pa | 2; } while (0)
+#define MAKE_SUPSECT_ENTRY(entry, pa) do { entry = pa | 0x40002; } while (0)
+#define MAKE_LV2TABLE_ENTRY(entry, pa) do { entry = pa | 1; } while (0)
+
+#define MAKE_LPAGE_ENTRY(entry, pa) do { entry = pa | 1; } while (0)
+#define MAKE_SPAGE_ENTRY(entry, pa) do { entry = pa | 3; } while (0)
+
+#define GET_LV2ENTRY(entry, iova) (\
+ (unsigned long *)phys_to_virt(entry & S5P_LV2TABLE_MASK) +\
+ ((iova & (~S5P_SECTION_MASK)) >> S5P_SPAGE_SHIFT))
+
+struct s5p_iommu_domain {
+ struct device *dev;
+ sysmmu_ips ips;
+ unsigned long *pgtable;
+};
+
+struct s5p_finddev_struct {
+ char *name;
+ int id;
+};
+/* Shared page table implementation */
+static unsigned long *pgtable;
+
+static struct s5p_finddev_struct pdev_names[S5P_SYSMMU_TOTAL_IPNUM] = {
+ {"s3c-pl330", 0},
+ {"s5p-sss", -1},
+ {"s3c-fimc", 0},
+ {"s3c-fimc", 1},
+ {"s3c-fimc", 2},
+ {"s3c-fimc", 3},
+ {"s5p-jpeg", -1},
+ {"s5p-fb", 0},
+ {"s5p-fb", 1},
+ {"s5p-pcie", -1},
+ {"s5p-fimg2d", -1},
+ {"s5p-rotator", -1},
+ {"s5p-mdma2", -1},
+ {"s5p-mixer", -1},
+ {"mfc", -1}, /* SYSMMU_MFC_L */
+};
+/* slab cache for level 2 page tables */
+static struct kmem_cache *l2table_cachep;
+
+LIST_HEAD(dev_lookup_list);
+
+struct dev_dom {
+ struct list_head node;
+ struct s5p_iommu_domain *dom;
+ struct device *dev;
+};
+
+static inline struct dev_dom *lookup_dev(struct device *dev)
+{
+ struct list_head *pos;
+ struct dev_dom *rel = NULL;
+
+ list_for_each(pos, &dev_lookup_list) {
+ rel = list_entry(pos, struct dev_dom, node);
+ if (rel->dev == dev)
+ return rel;
+ }
+
+ return NULL;
+}
+
+static inline int bind_dev(struct s5p_iommu_domain *dom, struct device *dev)
+{
+ struct dev_dom *rel;
+
+ rel = kmalloc(sizeof(*rel), GFP_KERNEL);
+ if (!rel)
+ return -ENOMEM;
+
+ if (!lookup_dev(dev)) {
+ rel->dom = dom;
+ rel->dev = dev;
+ list_add(&rel->node, &dev_lookup_list);
+ }
+
+ return 0;
+}
+
+static inline void unbind_dev(struct device *dev)
+{
+ struct dev_dom *rel;
+
+ rel = lookup_dev(dev);
+ if (rel)
+ list_del(&rel->node);
+}
+
+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 s5p_iommu_domain_init(struct iommu_domain *domain)
+{
+ struct s5p_iommu_domain *priv;
+
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL,
+ (S5P_LV1TABLE_ENTRIES * sizeof(unsigned long)) >> PAGE_SHIFT);
+ if (!priv->pgtable) {
+ kfree(priv);
+ return -ENOMEM;
+ }
+
+ memset(pgtable, 0, S5P_LV1TABLE_ENTRIES * sizeof(unsigned long));
+ pgtable_flush(pgtable, pgtable + S5P_LV1TABLE_ENTRIES);
+
+ domain->priv = priv;
+ return 0;
+}
+
+static void s5p_iommu_domain_destroy(struct iommu_domain *domain)
+{
+ struct s5p_iommu_domain *priv = domain->priv;
+
+ free_pages((unsigned long)priv->pgtable, 2);
+ kfree(domain->priv);
+ domain->priv = NULL;
+}
+
+static sysmmu_ips get_sysmmu_id(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++)
+ if ((strcmp(pdev->name, pdev_names[i].name) == 0) &&
+ (pdev->id == pdev_names[i].id))
+ break;
+
+ return (sysmmu_ips)i;
+}
+
+static int s5p_iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ sysmmu_ips ips;
+ int ret;
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+ struct platform_device *pdev =
+ container_of(dev, struct platform_device, dev);
+
+ ips = get_sysmmu_id(pdev);
+ if (ips == SYSMMU_NONE)
+ return -ENODEV;
+
+ s5p_domain->ips = ips;
+
+ s5p_sysmmu_enable(ips, (unsigned long)s5p_domain->pgtable);
+ if (ips == SYSMMU_MFC_L)
+ s5p_sysmmu_enable(ips + 1, (unsigned long)s5p_domain->pgtable);
+
+ s5p_domain->dev = dev;
+
+ ret = bind_dev(s5p_domain, dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void s5p_iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+
+ if (s5p_domain->dev == dev) {
+ s5p_sysmmu_disable(s5p_domain->ips);
+ if (s5p_domain->ips == SYSMMU_MFC_L)
+ s5p_sysmmu_disable(s5p_domain->ips + 1);
+ unbind_dev(dev);
+ }
+}
+
+static bool section_available(struct iommu_domain *domain,
+ unsigned long *lv1entry)
+{
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+
+ if (S5P_SECTION_LV1_ENTRY(*lv1entry)) {
+ dev_err(s5p_domain->dev,
+ "1MB entry alread exists at 0x%08x\n",
+ (lv1entry - s5p_domain->pgtable) * SZ_1M);
+ return false;
+ }
+
+ if (S5P_PAGE_LV1_ENTRY(*lv1entry)) {
+ unsigned long *lv2end, *lv2base;
+
+ lv2base = phys_to_virt(*lv1entry & S5P_LV2TABLE_MASK);
+ lv2end = lv2base + S5P_LV2TABLE_ENTRIES;
+ while (lv2base != lv2end) {
+ if (S5P_FAULT_LV2_ENTRY(*lv2base)) {
+ dev_err(s5p_domain->dev,
+ "Failed to free L2 page table for"
+ "section mapping.\n");
+ return false;
+ }
+ lv2base++;
+ }
+
+ kmem_cache_free(l2table_cachep,
+ phys_to_virt(*lv1entry & S5P_LV2TABLE_MASK));
+
+ MAKE_FAULT_ENTRY(*lv1entry);
+ }
+
+ return true;
+}
+
+static bool write_lpage(unsigned long *head_entry, unsigned long phys_addr)
+{
+ unsigned long *entry, *end;
+
+ entry = head_entry;
+ end = entry + (1 << S5P_LPAGE_ORDER);
+
+ while (entry != end) {
+ if (!S5P_FAULT_LV2_ENTRY(*entry))
+ break;
+
+ MAKE_LPAGE_ENTRY(*entry, phys_addr);
+
+ entry++;
+ }
+
+ if (entry != end) {
+ end = entry;
+ while (entry != head_entry)
+ MAKE_FAULT_ENTRY(*(--entry));
+
+ return false;
+ }
+
+ return true;
+}
+
+int s5p_iommu_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, int gfp_order, int prot)
+{
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+ unsigned long *start_entry, *entry, *end_entry;
+ int num_entry;
+
+ BUG_ON(s5p_domain->dev == NULL);
+
+ start_entry = entry = s5p_domain->pgtable + (iova >> S5P_SECTION_SHIFT);
+
+ if (gfp_order >= S5P_SECTION_ORDER) {
+ BUG_ON((paddr | iova) & ~S5P_SECTION_MASK);
+ /* 1MiB mapping */
+
+ num_entry = 1 << (gfp_order - S5P_SECTION_ORDER);
+ end_entry = entry + num_entry;
+
+ while (entry != end_entry) {
+ if (!section_available(domain, entry))
+ break;
+
+ MAKE_SECTION_ENTRY(*entry, paddr);
+
+ paddr += S5P_SECTION_SIZE;
+ entry++;
+ }
+
+ if (entry != end_entry)
+ goto mapping_error;
+
+ return 0;
+ }
+
+ if (S5P_FAULT_LV1_ENTRY(*entry)) {
+ unsigned long *l2table;
+
+ l2table = kmem_cache_zalloc(l2table_cachep, GFP_KERNEL);
+ if (!l2table)
+ return -ENOMEM;
+
+ pgtable_flush(entry, entry + S5P_LV2TABLE_ENTRIES);
+
+ MAKE_LV2TABLE_ENTRY(*entry, virt_to_phys(l2table));
+ pgtable_flush(entry, entry + 1);
+ }
+
+ /* 'entry' points level 2 entries, hereafter */
+ entry = GET_LV2ENTRY(*entry, iova);
+
+ start_entry = entry;
+ num_entry = 1 << gfp_order;
+ end_entry = entry + num_entry;
+
+ if (gfp_order >= S5P_LPAGE_ORDER) {
+ /* large page(64KiB) mapping */
+ BUG_ON((paddr | iova) & ~S5P_LPAGE_MASK);
+
+ while (entry != end_entry) {
+ if (!write_lpage(entry, paddr)) {
+ dev_err(s5p_domain->dev,
+ "Failed to allocate large page entry.\n"
+ );
+ break;
+ }
+
+ paddr += S5P_LPAGE_SIZE;
+ entry += (1 << S5P_LPAGE_ORDER);
+ }
+
+ if (entry != end_entry) {
+ entry -= 1 << S5P_LPAGE_ORDER;
+ goto mapping_error;
+ }
+
+ return 0;
+ }
+
+ /* page (4KiB) mapping */
+ while (entry != end_entry && !S5P_FAULT_LV2_ENTRY(*entry)) {
+
+ MAKE_SPAGE_ENTRY(*entry, paddr);
+
+ entry++;
+ paddr += S5P_SPAGE_SIZE;
+ }
+
+ if (entry != end_entry) {
+ dev_err(s5p_domain->dev,
+ "Failed to allocate small page entry.\n");
+ goto mapping_error;
+ }
+
+ pgtable_flush(start_entry, entry);
+mapping_error:
+ if (entry != end_entry) {
+ while (entry != start_entry)
+ MAKE_FAULT_ENTRY(*(--entry));
+ return -EADDRINUSE;
+ }
+
+ return 0;
+}
+
+int s5p_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
+ int gfp_order)
+{
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+ unsigned long *entry;
+ int num_entry;
+
+ BUG_ON(s5p_domain->dev == NULL);
+
+ entry = s5p_domain->pgtable + (iova >> S5P_SECTION_SHIFT);
+
+ if (gfp_order >= S5P_SECTION_ORDER)
+ gfp_order -= S5P_SECTION_ORDER;
+ else
+ entry = GET_LV2ENTRY(*entry, iova);
+
+ BUG_ON(S5P_LPAGE_LV2_ENTRY(*entry) && (gfp_order < S5P_LPAGE_ORDER));
+
+ num_entry = 1 << gfp_order;
+
+ while (num_entry-- > 0) {
+ MAKE_FAULT_ENTRY(*entry);
+ entry++;
+ }
+
+ s5p_sysmmu_tlb_invalidate(s5p_domain->ips);
+ if (s5p_domain->ips == SYSMMU_MFC_L)
+ s5p_sysmmu_tlb_invalidate(s5p_domain->ips + 1);
+ return 0;
+}
+
+phys_addr_t s5p_iommu_iova_to_phys(struct iommu_domain *domain,
+ unsigned long iova)
+{
+ struct s5p_iommu_domain *s5p_domain = domain->priv;
+ unsigned long *entry;
+ unsigned long offset;
+
+ entry = s5p_domain->pgtable + (iova >> S5P_SECTION_SHIFT);
+
+ if (S5P_FAULT_LV1_ENTRY(*entry))
+ return 0;
+
+ offset = iova & ~S5P_SECTION_MASK;
+
+ if (S5P_SECTION_LV1_ENTRY(*entry))
+ return (*entry & S5P_SECTION_MASK) + offset;
+
+ entry = GET_LV2ENTRY(*entry, iova);
+
+ if (S5P_SPAGE_LV2_ENTRY(*entry))
+ return (*entry & S5P_SPAGE_MASK) + (iova & ~S5P_SPAGE_MASK);
+
+ if (S5P_LPAGE_LV2_ENTRY(*entry))
+ return (*entry & S5P_LPAGE_MASK) + (iova & ~S5P_LPAGE_MASK);
+
+ return 0;
+}
+
+static int s5p_iommu_domain_has_cap(struct iommu_domain *domain,
+ unsigned long cap)
+{
+ return 0;
+}
+
+static struct iommu_ops s5p_iommu_ops = {
+ .domain_init = &s5p_iommu_domain_init,
+ .domain_destroy = &s5p_iommu_domain_destroy,
+ .attach_dev = &s5p_iommu_attach_device,
+ .detach_dev = &s5p_iommu_detach_device,
+ .map = &s5p_iommu_map,
+ .unmap = &s5p_iommu_unmap,
+ .iova_to_phys = &s5p_iommu_iova_to_phys,
+ .domain_has_cap = &s5p_iommu_domain_has_cap
+};
+
+static int __init s5p_iommu_init(void)
+{
+ l2table_cachep = kmem_cache_create("SysMMU Lv2 Tables",
+ S5P_LV2TABLE_SIZE, S5P_LV2TABLE_SIZE, 0, NULL);
+ if (!l2table_cachep)
+ return -ENOMEM;
+
+ register_iommu(&s5p_iommu_ops);
+ return 0;
+}
+arch_initcall(s5p_iommu_init);
--
1.7.1
--
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