--- /dev/null
--- /dev/null
++ /*
++ * omap iommu: tlb and pagetable primitives
++ *
++ * Copyright (C) 2008-2010 Nokia Corporation
++ *
++ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
++ * Paul Mundt and Toshihiro Kobayashi
++ *
++ * 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/err.h>
++ #include <linux/module.h>
++ #include <linux/slab.h>
++ #include <linux/interrupt.h>
++ #include <linux/ioport.h>
++ #include <linux/clk.h>
++ #include <linux/platform_device.h>
++ #include <linux/iommu.h>
++ #include <linux/mutex.h>
++ #include <linux/spinlock.h>
++
++ #include <asm/cacheflush.h>
++
++ #include <plat/iommu.h>
++
++ #include <plat/iopgtable.h>
++
++ #define for_each_iotlb_cr(obj, n, __i, cr) \
++ for (__i = 0; \
++ (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true); \
++ __i++)
++
++ /**
++ * struct omap_iommu_domain - omap iommu domain
++ * @pgtable: the page table
++ * @iommu_dev: an omap iommu device attached to this domain. only a single
++ * iommu device can be attached for now.
++ * @lock: domain lock, should be taken when attaching/detaching
++ */
++ struct omap_iommu_domain {
++ u32 *pgtable;
++ struct omap_iommu *iommu_dev;
++ spinlock_t lock;
++ };
++
++ /* accommodate the difference between omap1 and omap2/3 */
++ static const struct iommu_functions *arch_iommu;
++
++ static struct platform_driver omap_iommu_driver;
++ static struct kmem_cache *iopte_cachep;
++
++ /**
++ * omap_install_iommu_arch - Install archtecure specific iommu functions
++ * @ops: a pointer to architecture specific iommu functions
++ *
++ * There are several kind of iommu algorithm(tlb, pagetable) among
++ * omap series. This interface installs such an iommu algorighm.
++ **/
++ int omap_install_iommu_arch(const struct iommu_functions *ops)
++ {
++ if (arch_iommu)
++ return -EBUSY;
++
++ arch_iommu = ops;
++ return 0;
++ }
++ EXPORT_SYMBOL_GPL(omap_install_iommu_arch);
++
++ /**
++ * omap_uninstall_iommu_arch - Uninstall archtecure specific iommu functions
++ * @ops: a pointer to architecture specific iommu functions
++ *
++ * This interface uninstalls the iommu algorighm installed previously.
++ **/
++ void omap_uninstall_iommu_arch(const struct iommu_functions *ops)
++ {
++ if (arch_iommu != ops)
++ pr_err("%s: not your arch\n", __func__);
++
++ arch_iommu = NULL;
++ }
++ EXPORT_SYMBOL_GPL(omap_uninstall_iommu_arch);
++
++ /**
++ * omap_iommu_save_ctx - Save registers for pm off-mode support
++ * @obj: target iommu
++ **/
++ void omap_iommu_save_ctx(struct omap_iommu *obj)
++ {
++ arch_iommu->save_ctx(obj);
++ }
++ EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);
++
++ /**
++ * omap_iommu_restore_ctx - Restore registers for pm off-mode support
++ * @obj: target iommu
++ **/
++ void omap_iommu_restore_ctx(struct omap_iommu *obj)
++ {
++ arch_iommu->restore_ctx(obj);
++ }
++ EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx);
++
++ /**
++ * omap_iommu_arch_version - Return running iommu arch version
++ **/
++ u32 omap_iommu_arch_version(void)
++ {
++ return arch_iommu->version;
++ }
++ EXPORT_SYMBOL_GPL(omap_iommu_arch_version);
++
++ static int iommu_enable(struct omap_iommu *obj)
++ {
++ int err;
++
++ if (!obj)
++ return -EINVAL;
++
++ if (!arch_iommu)
++ return -ENODEV;
++
++ clk_enable(obj->clk);
++
++ err = arch_iommu->enable(obj);
++
++ clk_disable(obj->clk);
++ return err;
++ }
++
++ static void iommu_disable(struct omap_iommu *obj)
++ {
++ if (!obj)
++ return;
++
++ clk_enable(obj->clk);
++
++ arch_iommu->disable(obj);
++
++ clk_disable(obj->clk);
++ }
++
++ /*
++ * TLB operations
++ */
++ void omap_iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
++ {
++ BUG_ON(!cr || !e);
++
++ arch_iommu->cr_to_e(cr, e);
++ }
++ EXPORT_SYMBOL_GPL(omap_iotlb_cr_to_e);
++
++ static inline int iotlb_cr_valid(struct cr_regs *cr)
++ {
++ if (!cr)
++ return -EINVAL;
++
++ return arch_iommu->cr_valid(cr);
++ }
++
++ static inline struct cr_regs *iotlb_alloc_cr(struct omap_iommu *obj,
++ struct iotlb_entry *e)
++ {
++ if (!e)
++ return NULL;
++
++ return arch_iommu->alloc_cr(obj, e);
++ }
++
++ static u32 iotlb_cr_to_virt(struct cr_regs *cr)
++ {
++ return arch_iommu->cr_to_virt(cr);
++ }
++
++ static u32 get_iopte_attr(struct iotlb_entry *e)
++ {
++ return arch_iommu->get_pte_attr(e);
++ }
++
++ static u32 iommu_report_fault(struct omap_iommu *obj, u32 *da)
++ {
++ return arch_iommu->fault_isr(obj, da);
++ }
++
++ static void iotlb_lock_get(struct omap_iommu *obj, struct iotlb_lock *l)
++ {
++ u32 val;
++
++ val = iommu_read_reg(obj, MMU_LOCK);
++
++ l->base = MMU_LOCK_BASE(val);
++ l->vict = MMU_LOCK_VICT(val);
++
++ }
++
++ static void iotlb_lock_set(struct omap_iommu *obj, struct iotlb_lock *l)
++ {
++ u32 val;
++
++ val = (l->base << MMU_LOCK_BASE_SHIFT);
++ val |= (l->vict << MMU_LOCK_VICT_SHIFT);
++
++ iommu_write_reg(obj, val, MMU_LOCK);
++ }
++
++ static void iotlb_read_cr(struct omap_iommu *obj, struct cr_regs *cr)
++ {
++ arch_iommu->tlb_read_cr(obj, cr);
++ }
++
++ static void iotlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr)
++ {
++ arch_iommu->tlb_load_cr(obj, cr);
++
++ iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
++ iommu_write_reg(obj, 1, MMU_LD_TLB);
++ }
++
++ /**
++ * iotlb_dump_cr - Dump an iommu tlb entry into buf
++ * @obj: target iommu
++ * @cr: contents of cam and ram register
++ * @buf: output buffer
++ **/
++ static inline ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
++ char *buf)
++ {
++ BUG_ON(!cr || !buf);
++
++ return arch_iommu->dump_cr(obj, cr, buf);
++ }
++
++ /* only used in iotlb iteration for-loop */
++ static struct cr_regs __iotlb_read_cr(struct omap_iommu *obj, int n)
++ {
++ struct cr_regs cr;
++ struct iotlb_lock l;
++
++ iotlb_lock_get(obj, &l);
++ l.vict = n;
++ iotlb_lock_set(obj, &l);
++ iotlb_read_cr(obj, &cr);
++
++ return cr;
++ }
++
++ /**
++ * load_iotlb_entry - Set an iommu tlb entry
++ * @obj: target iommu
++ * @e: an iommu tlb entry info
++ **/
++ #ifdef PREFETCH_IOTLB
++ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
++ {
++ int err = 0;
++ struct iotlb_lock l;
++ struct cr_regs *cr;
++
++ if (!obj || !obj->nr_tlb_entries || !e)
++ return -EINVAL;
++
++ clk_enable(obj->clk);
++
++ iotlb_lock_get(obj, &l);
++ if (l.base == obj->nr_tlb_entries) {
++ dev_warn(obj->dev, "%s: preserve entries full\n", __func__);
++ err = -EBUSY;
++ goto out;
++ }
++ if (!e->prsvd) {
++ int i;
++ struct cr_regs tmp;
++
++ for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, tmp)
++ if (!iotlb_cr_valid(&tmp))
++ break;
++
++ if (i == obj->nr_tlb_entries) {
++ dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
++ err = -EBUSY;
++ goto out;
++ }
++
++ iotlb_lock_get(obj, &l);
++ } else {
++ l.vict = l.base;
++ iotlb_lock_set(obj, &l);
++ }
++
++ cr = iotlb_alloc_cr(obj, e);
++ if (IS_ERR(cr)) {
++ clk_disable(obj->clk);
++ return PTR_ERR(cr);
++ }
++
++ iotlb_load_cr(obj, cr);
++ kfree(cr);
++
++ if (e->prsvd)
++ l.base++;
++ /* increment victim for next tlb load */
++ if (++l.vict == obj->nr_tlb_entries)
++ l.vict = l.base;
++ iotlb_lock_set(obj, &l);
++ out:
++ clk_disable(obj->clk);
++ return err;
++ }
++
++ #else /* !PREFETCH_IOTLB */
++
++ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
++ {
++ return 0;
++ }
++
++ #endif /* !PREFETCH_IOTLB */
++
++ static int prefetch_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
++ {
++ return load_iotlb_entry(obj, e);
++ }
++
++ /**
++ * flush_iotlb_page - Clear an iommu tlb entry
++ * @obj: target iommu
++ * @da: iommu device virtual address
++ *
++ * Clear an iommu tlb entry which includes 'da' address.
++ **/
++ static void flush_iotlb_page(struct omap_iommu *obj, u32 da)
++ {
++ int i;
++ struct cr_regs cr;
++
++ clk_enable(obj->clk);
++
++ for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) {
++ u32 start;
++ size_t bytes;
++
++ if (!iotlb_cr_valid(&cr))
++ continue;
++
++ start = iotlb_cr_to_virt(&cr);
++ bytes = iopgsz_to_bytes(cr.cam & 3);
++
++ if ((start <= da) && (da < start + bytes)) {
++ dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
++ __func__, start, da, bytes);
++ iotlb_load_cr(obj, &cr);
++ iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
++ }
++ }
++ clk_disable(obj->clk);
++
++ if (i == obj->nr_tlb_entries)
++ dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
++ }
++
++ /**
++ * flush_iotlb_all - Clear all iommu tlb entries
++ * @obj: target iommu
++ **/
++ static void flush_iotlb_all(struct omap_iommu *obj)
++ {
++ struct iotlb_lock l;
++
++ clk_enable(obj->clk);
++
++ l.base = 0;
++ l.vict = 0;
++ iotlb_lock_set(obj, &l);
++
++ iommu_write_reg(obj, 1, MMU_GFLUSH);
++
++ clk_disable(obj->clk);
++ }
++
--#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
++ ++#if defined(CONFIG_OMAP_IOMMU_DEBUG) || defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
++
++ ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t bytes)
++ {
++ if (!obj || !buf)
++ return -EINVAL;
++
++ clk_enable(obj->clk);
++
++ bytes = arch_iommu->dump_ctx(obj, buf, bytes);
++
++ clk_disable(obj->clk);
++
++ return bytes;
++ }
++ EXPORT_SYMBOL_GPL(omap_iommu_dump_ctx);
++
++ static int
++ __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
++ {
++ int i;
++ struct iotlb_lock saved;
++ struct cr_regs tmp;
++ struct cr_regs *p = crs;
++
++ clk_enable(obj->clk);
++ iotlb_lock_get(obj, &saved);
++
++ for_each_iotlb_cr(obj, num, i, tmp) {
++ if (!iotlb_cr_valid(&tmp))
++ continue;
++ *p++ = tmp;
++ }
++
++ iotlb_lock_set(obj, &saved);
++ clk_disable(obj->clk);
++
++ return p - crs;
++ }
++
++ /**
++ * omap_dump_tlb_entries - dump cr arrays to given buffer
++ * @obj: target iommu
++ * @buf: output buffer
++ **/
++ size_t omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t bytes)
++ {
++ int i, num;
++ struct cr_regs *cr;
++ char *p = buf;
++
++ num = bytes / sizeof(*cr);
++ num = min(obj->nr_tlb_entries, num);
++
++ cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
++ if (!cr)
++ return 0;
++
++ num = __dump_tlb_entries(obj, cr, num);
++ for (i = 0; i < num; i++)
++ p += iotlb_dump_cr(obj, cr + i, p);
++ kfree(cr);
++
++ return p - buf;
++ }
++ EXPORT_SYMBOL_GPL(omap_dump_tlb_entries);
++
++ int omap_foreach_iommu_device(void *data, int (*fn)(struct device *, void *))
++ {
++ return driver_for_each_device(&omap_iommu_driver.driver,
++ NULL, data, fn);
++ }
++ EXPORT_SYMBOL_GPL(omap_foreach_iommu_device);
++
++ #endif /* CONFIG_OMAP_IOMMU_DEBUG_MODULE */
++
++ /*
++ * H/W pagetable operations
++ */
++ static void flush_iopgd_range(u32 *first, u32 *last)
++ {
++ /* FIXME: L2 cache should be taken care of if it exists */
++ do {
++ asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pgd"
++ : : "r" (first));
++ first += L1_CACHE_BYTES / sizeof(*first);
++ } while (first <= last);
++ }
++
++ static void flush_iopte_range(u32 *first, u32 *last)
++ {
++ /* FIXME: L2 cache should be taken care of if it exists */
++ do {
++ asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pte"
++ : : "r" (first));
++ first += L1_CACHE_BYTES / sizeof(*first);
++ } while (first <= last);
++ }
++
++ static void iopte_free(u32 *iopte)
++ {
++ /* Note: freed iopte's must be clean ready for re-use */
++ kmem_cache_free(iopte_cachep, iopte);
++ }
++
++ static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd, u32 da)
++ {
++ u32 *iopte;
++
++ /* a table has already existed */
++ if (*iopgd)
++ goto pte_ready;
++
++ /*
++ * do the allocation outside the page table lock
++ */
++ spin_unlock(&obj->page_table_lock);
++ iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
++ spin_lock(&obj->page_table_lock);
++
++ if (!*iopgd) {
++ if (!iopte)
++ return ERR_PTR(-ENOMEM);
++
++ *iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
++ flush_iopgd_range(iopgd, iopgd);
++
++ dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
++ } else {
++ /* We raced, free the reduniovant table */
++ iopte_free(iopte);
++ }
++
++ pte_ready:
++ iopte = iopte_offset(iopgd, da);
++
++ dev_vdbg(obj->dev,
++ "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
++ __func__, da, iopgd, *iopgd, iopte, *iopte);
++
++ return iopte;
++ }
++
++ static int iopgd_alloc_section(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
++ {
++ u32 *iopgd = iopgd_offset(obj, da);
++
++ if ((da | pa) & ~IOSECTION_MASK) {
++ dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
++ __func__, da, pa, IOSECTION_SIZE);
++ return -EINVAL;
++ }
++
++ *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
++ flush_iopgd_range(iopgd, iopgd);
++ return 0;
++ }
++
++ static int iopgd_alloc_super(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
++ {
++ u32 *iopgd = iopgd_offset(obj, da);
++ int i;
++
++ if ((da | pa) & ~IOSUPER_MASK) {
++ dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
++ __func__, da, pa, IOSUPER_SIZE);
++ return -EINVAL;
++ }
++
++ for (i = 0; i < 16; i++)
++ *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
++ flush_iopgd_range(iopgd, iopgd + 15);
++ return 0;
++ }
++
++ static int iopte_alloc_page(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
++ {
++ u32 *iopgd = iopgd_offset(obj, da);
++ u32 *iopte = iopte_alloc(obj, iopgd, da);
++
++ if (IS_ERR(iopte))
++ return PTR_ERR(iopte);
++
++ *iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
++ flush_iopte_range(iopte, iopte);
++
++ dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
++ __func__, da, pa, iopte, *iopte);
++
++ return 0;
++ }
++
++ static int iopte_alloc_large(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
++ {
++ u32 *iopgd = iopgd_offset(obj, da);
++ u32 *iopte = iopte_alloc(obj, iopgd, da);
++ int i;
++
++ if ((da | pa) & ~IOLARGE_MASK) {
++ dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
++ __func__, da, pa, IOLARGE_SIZE);
++ return -EINVAL;
++ }
++
++ if (IS_ERR(iopte))
++ return PTR_ERR(iopte);
++
++ for (i = 0; i < 16; i++)
++ *(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
++ flush_iopte_range(iopte, iopte + 15);
++ return 0;
++ }
++
++ static int
++ iopgtable_store_entry_core(struct omap_iommu *obj, struct iotlb_entry *e)
++ {
++ int (*fn)(struct omap_iommu *, u32, u32, u32);
++ u32 prot;
++ int err;
++
++ if (!obj || !e)
++ return -EINVAL;
++
++ switch (e->pgsz) {
++ case MMU_CAM_PGSZ_16M:
++ fn = iopgd_alloc_super;
++ break;
++ case MMU_CAM_PGSZ_1M:
++ fn = iopgd_alloc_section;
++ break;
++ case MMU_CAM_PGSZ_64K:
++ fn = iopte_alloc_large;
++ break;
++ case MMU_CAM_PGSZ_4K:
++ fn = iopte_alloc_page;
++ break;
++ default:
++ fn = NULL;
++ BUG();
++ break;
++ }
++
++ prot = get_iopte_attr(e);
++
++ spin_lock(&obj->page_table_lock);
++ err = fn(obj, e->da, e->pa, prot);
++ spin_unlock(&obj->page_table_lock);
++
++ return err;
++ }
++
++ /**
++ * omap_iopgtable_store_entry - Make an iommu pte entry
++ * @obj: target iommu
++ * @e: an iommu tlb entry info
++ **/
++ int omap_iopgtable_store_entry(struct omap_iommu *obj, struct iotlb_entry *e)
++ {
++ int err;
++
++ flush_iotlb_page(obj, e->da);
++ err = iopgtable_store_entry_core(obj, e);
++ if (!err)
++ prefetch_iotlb_entry(obj, e);
++ return err;
++ }
++ EXPORT_SYMBOL_GPL(omap_iopgtable_store_entry);
++
++ /**
++ * iopgtable_lookup_entry - Lookup an iommu pte entry
++ * @obj: target iommu
++ * @da: iommu device virtual address
++ * @ppgd: iommu pgd entry pointer to be returned
++ * @ppte: iommu pte entry pointer to be returned
++ **/
++ static void
++ iopgtable_lookup_entry(struct omap_iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
++ {
++ u32 *iopgd, *iopte = NULL;
++
++ iopgd = iopgd_offset(obj, da);
++ if (!*iopgd)
++ goto out;
++
++ if (iopgd_is_table(*iopgd))
++ iopte = iopte_offset(iopgd, da);
++ out:
++ *ppgd = iopgd;
++ *ppte = iopte;
++ }
++
++ static size_t iopgtable_clear_entry_core(struct omap_iommu *obj, u32 da)
++ {
++ size_t bytes;
++ u32 *iopgd = iopgd_offset(obj, da);
++ int nent = 1;
++
++ if (!*iopgd)
++ return 0;
++
++ if (iopgd_is_table(*iopgd)) {
++ int i;
++ u32 *iopte = iopte_offset(iopgd, da);
++
++ bytes = IOPTE_SIZE;
++ if (*iopte & IOPTE_LARGE) {
++ nent *= 16;
++ /* rewind to the 1st entry */
++ iopte = iopte_offset(iopgd, (da & IOLARGE_MASK));
++ }
++ bytes *= nent;
++ memset(iopte, 0, nent * sizeof(*iopte));
++ flush_iopte_range(iopte, iopte + (nent - 1) * sizeof(*iopte));
++
++ /*
++ * do table walk to check if this table is necessary or not
++ */
++ iopte = iopte_offset(iopgd, 0);
++ for (i = 0; i < PTRS_PER_IOPTE; i++)
++ if (iopte[i])
++ goto out;
++
++ iopte_free(iopte);
++ nent = 1; /* for the next L1 entry */
++ } else {
++ bytes = IOPGD_SIZE;
++ if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) {
++ nent *= 16;
++ /* rewind to the 1st entry */
++ iopgd = iopgd_offset(obj, (da & IOSUPER_MASK));
++ }
++ bytes *= nent;
++ }
++ memset(iopgd, 0, nent * sizeof(*iopgd));
++ flush_iopgd_range(iopgd, iopgd + (nent - 1) * sizeof(*iopgd));
++ out:
++ return bytes;
++ }
++
++ /**
++ * iopgtable_clear_entry - Remove an iommu pte entry
++ * @obj: target iommu
++ * @da: iommu device virtual address
++ **/
++ static size_t iopgtable_clear_entry(struct omap_iommu *obj, u32 da)
++ {
++ size_t bytes;
++
++ spin_lock(&obj->page_table_lock);
++
++ bytes = iopgtable_clear_entry_core(obj, da);
++ flush_iotlb_page(obj, da);
++
++ spin_unlock(&obj->page_table_lock);
++
++ return bytes;
++ }
++
++ static void iopgtable_clear_entry_all(struct omap_iommu *obj)
++ {
++ int i;
++
++ spin_lock(&obj->page_table_lock);
++
++ for (i = 0; i < PTRS_PER_IOPGD; i++) {
++ u32 da;
++ u32 *iopgd;
++
++ da = i << IOPGD_SHIFT;
++ iopgd = iopgd_offset(obj, da);
++
++ if (!*iopgd)
++ continue;
++
++ if (iopgd_is_table(*iopgd))
++ iopte_free(iopte_offset(iopgd, 0));
++
++ *iopgd = 0;
++ flush_iopgd_range(iopgd, iopgd);
++ }
++
++ flush_iotlb_all(obj);
++
++ spin_unlock(&obj->page_table_lock);
++ }
++
++ /*
++ * Device IOMMU generic operations
++ */
++ static irqreturn_t iommu_fault_handler(int irq, void *data)
++ {
++ u32 da, errs;
++ u32 *iopgd, *iopte;
++ struct omap_iommu *obj = data;
+++ + struct iommu_domain *domain = obj->domain;
++
++ if (!obj->refcount)
++ return IRQ_NONE;
++
++ clk_enable(obj->clk);
++ errs = iommu_report_fault(obj, &da);
++ clk_disable(obj->clk);
++ if (errs == 0)
++ return IRQ_HANDLED;
++
++ /* Fault callback or TLB/PTE Dynamic loading */
- - if (obj->isr && !obj->isr(obj, da, errs, obj->isr_priv))
+++ + if (!report_iommu_fault(domain, obj->dev, da, 0))
++ return IRQ_HANDLED;
++
++ iommu_disable(obj);
++
++ iopgd = iopgd_offset(obj, da);
++
++ if (!iopgd_is_table(*iopgd)) {
++ dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p "
++ "*pgd:px%08x\n", obj->name, errs, da, iopgd, *iopgd);
++ return IRQ_NONE;
++ }
++
++ iopte = iopte_offset(iopgd, da);
++
++ dev_err(obj->dev, "%s: errs:0x%08x da:0x%08x pgd:0x%p *pgd:0x%08x "
++ "pte:0x%p *pte:0x%08x\n", obj->name, errs, da, iopgd, *iopgd,
++ iopte, *iopte);
++
++ return IRQ_NONE;
++ }
++
++ static int device_match_by_alias(struct device *dev, void *data)
++ {
++ struct omap_iommu *obj = to_iommu(dev);
++ const char *name = data;
++
++ pr_debug("%s: %s %s\n", __func__, obj->name, name);
++
++ return strcmp(obj->name, name) == 0;
++ }
++
++ /**
++ * omap_find_iommu_device() - find an omap iommu device by name
++ * @name: name of the iommu device
++ *
++ * The generic iommu API requires the caller to provide the device
++ * he wishes to attach to a certain iommu domain.
++ *
++ * Drivers generally should not bother with this as it should just
++ * be taken care of by the DMA-API using dev_archdata.
++ *
++ * This function is provided as an interim solution until the latter
++ * materializes, and omap3isp is fully migrated to the DMA-API.
++ */
++ struct device *omap_find_iommu_device(const char *name)
++ {
++ return driver_find_device(&omap_iommu_driver.driver, NULL,
++ (void *)name,
++ device_match_by_alias);
++ }
++ EXPORT_SYMBOL_GPL(omap_find_iommu_device);
++
++ /**
++ * omap_iommu_attach() - attach iommu device to an iommu domain
++ * @dev: target omap iommu device
++ * @iopgd: page table
++ **/
++ static struct omap_iommu *omap_iommu_attach(struct device *dev, u32 *iopgd)
++ {
++ int err = -ENOMEM;
++ struct omap_iommu *obj = to_iommu(dev);
++
++ spin_lock(&obj->iommu_lock);
++
++ /* an iommu device can only be attached once */
++ if (++obj->refcount > 1) {
++ dev_err(dev, "%s: already attached!\n", obj->name);
++ err = -EBUSY;
++ goto err_enable;
++ }
++
++ obj->iopgd = iopgd;
++ err = iommu_enable(obj);
++ if (err)
++ goto err_enable;
++ flush_iotlb_all(obj);
++
++ if (!try_module_get(obj->owner))
++ goto err_module;
++
++ spin_unlock(&obj->iommu_lock);
++
++ dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
++ return obj;
++
++ err_module:
++ if (obj->refcount == 1)
++ iommu_disable(obj);
++ err_enable:
++ obj->refcount--;
++ spin_unlock(&obj->iommu_lock);
++ return ERR_PTR(err);
++ }
++
++ /**
++ * omap_iommu_detach - release iommu device
++ * @obj: target iommu
++ **/
++ static void omap_iommu_detach(struct omap_iommu *obj)
++ {
++ if (!obj || IS_ERR(obj))
++ return;
++
++ spin_lock(&obj->iommu_lock);
++
++ if (--obj->refcount == 0)
++ iommu_disable(obj);
++
++ module_put(obj->owner);
++
++ obj->iopgd = NULL;
++
++ spin_unlock(&obj->iommu_lock);
++
++ dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
++ }
++
- -int omap_iommu_set_isr(const char *name,
- - int (*isr)(struct omap_iommu *obj, u32 da, u32 iommu_errs,
- - void *priv),
- - void *isr_priv)
- -{
- - struct device *dev;
- - struct omap_iommu *obj;
- -
- - dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
- - device_match_by_alias);
- - if (!dev)
- - return -ENODEV;
- -
- - obj = to_iommu(dev);
- - spin_lock(&obj->iommu_lock);
- - if (obj->refcount != 0) {
- - spin_unlock(&obj->iommu_lock);
- - return -EBUSY;
- - }
- - obj->isr = isr;
- - obj->isr_priv = isr_priv;
- - spin_unlock(&obj->iommu_lock);
- -
- - return 0;
- -}
- -EXPORT_SYMBOL_GPL(omap_iommu_set_isr);
- -
++ /*
++ * OMAP Device MMU(IOMMU) detection
++ */
++ static int __devinit omap_iommu_probe(struct platform_device *pdev)
++ {
++ int err = -ENODEV;
++ int irq;
++ struct omap_iommu *obj;
++ struct resource *res;
++ struct iommu_platform_data *pdata = pdev->dev.platform_data;
++
++ if (pdev->num_resources != 2)
++ return -EINVAL;
++
++ obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
++ if (!obj)
++ return -ENOMEM;
++
++ obj->clk = clk_get(&pdev->dev, pdata->clk_name);
++ if (IS_ERR(obj->clk))
++ goto err_clk;
++
++ obj->nr_tlb_entries = pdata->nr_tlb_entries;
++ obj->name = pdata->name;
++ obj->dev = &pdev->dev;
++ obj->ctx = (void *)obj + sizeof(*obj);
++ obj->da_start = pdata->da_start;
++ obj->da_end = pdata->da_end;
++
++ spin_lock_init(&obj->iommu_lock);
++ mutex_init(&obj->mmap_lock);
++ spin_lock_init(&obj->page_table_lock);
++ INIT_LIST_HEAD(&obj->mmap);
++
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (!res) {
++ err = -ENODEV;
++ goto err_mem;
++ }
++
++ res = request_mem_region(res->start, resource_size(res),
++ dev_name(&pdev->dev));
++ if (!res) {
++ err = -EIO;
++ goto err_mem;
++ }
++
++ obj->regbase = ioremap(res->start, resource_size(res));
++ if (!obj->regbase) {
++ err = -ENOMEM;
++ goto err_ioremap;
++ }
++
++ irq = platform_get_irq(pdev, 0);
++ if (irq < 0) {
++ err = -ENODEV;
++ goto err_irq;
++ }
++ err = request_irq(irq, iommu_fault_handler, IRQF_SHARED,
++ dev_name(&pdev->dev), obj);
++ if (err < 0)
++ goto err_irq;
++ platform_set_drvdata(pdev, obj);
++
++ dev_info(&pdev->dev, "%s registered\n", obj->name);
++ return 0;
++
++ err_irq:
++ iounmap(obj->regbase);
++ err_ioremap:
++ release_mem_region(res->start, resource_size(res));
++ err_mem:
++ clk_put(obj->clk);
++ err_clk:
++ kfree(obj);
++ return err;
++ }
++
++ static int __devexit omap_iommu_remove(struct platform_device *pdev)
++ {
++ int irq;
++ struct resource *res;
++ struct omap_iommu *obj = platform_get_drvdata(pdev);
++
++ platform_set_drvdata(pdev, NULL);
++
++ iopgtable_clear_entry_all(obj);
++
++ irq = platform_get_irq(pdev, 0);
++ free_irq(irq, obj);
++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ release_mem_region(res->start, resource_size(res));
++ iounmap(obj->regbase);
++
++ clk_put(obj->clk);
++ dev_info(&pdev->dev, "%s removed\n", obj->name);
++ kfree(obj);
++ return 0;
++ }
++
++ static struct platform_driver omap_iommu_driver = {
++ .probe = omap_iommu_probe,
++ .remove = __devexit_p(omap_iommu_remove),
++ .driver = {
++ .name = "omap-iommu",
++ },
++ };
++
++ static void iopte_cachep_ctor(void *iopte)
++ {
++ clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
++ }
++
++ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
++ phys_addr_t pa, int order, int prot)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++ struct omap_iommu *oiommu = omap_domain->iommu_dev;
++ struct device *dev = oiommu->dev;
++ size_t bytes = PAGE_SIZE << order;
++ struct iotlb_entry e;
++ int omap_pgsz;
++ u32 ret, flags;
++
++ /* we only support mapping a single iommu page for now */
++ omap_pgsz = bytes_to_iopgsz(bytes);
++ if (omap_pgsz < 0) {
++ dev_err(dev, "invalid size to map: %d\n", bytes);
++ return -EINVAL;
++ }
++
++ dev_dbg(dev, "mapping da 0x%lx to pa 0x%x size 0x%x\n", da, pa, bytes);
++
++ flags = omap_pgsz | prot;
++
++ iotlb_init_entry(&e, da, pa, flags);
++
++ ret = omap_iopgtable_store_entry(oiommu, &e);
++ if (ret)
++ dev_err(dev, "omap_iopgtable_store_entry failed: %d\n", ret);
++
++ return ret;
++ }
++
++ static int omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
++ int order)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++ struct omap_iommu *oiommu = omap_domain->iommu_dev;
++ struct device *dev = oiommu->dev;
++ size_t unmap_size;
++
++ dev_dbg(dev, "unmapping da 0x%lx order %d\n", da, order);
++
++ unmap_size = iopgtable_clear_entry(oiommu, da);
++
++ return unmap_size ? get_order(unmap_size) : -EINVAL;
++ }
++
++ static int
++ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++ struct omap_iommu *oiommu;
++ int ret = 0;
++
++ spin_lock(&omap_domain->lock);
++
++ /* only a single device is supported per domain for now */
++ if (omap_domain->iommu_dev) {
++ dev_err(dev, "iommu domain is already attached\n");
++ ret = -EBUSY;
++ goto out;
++ }
++
++ /* get a handle to and enable the omap iommu */
++ oiommu = omap_iommu_attach(dev, omap_domain->pgtable);
++ if (IS_ERR(oiommu)) {
++ ret = PTR_ERR(oiommu);
++ dev_err(dev, "can't get omap iommu: %d\n", ret);
++ goto out;
++ }
++
++ omap_domain->iommu_dev = oiommu;
+++ + oiommu->domain = domain;
++
++ out:
++ spin_unlock(&omap_domain->lock);
++ return ret;
++ }
++
++ static void omap_iommu_detach_dev(struct iommu_domain *domain,
++ struct device *dev)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++ struct omap_iommu *oiommu = to_iommu(dev);
++
++ spin_lock(&omap_domain->lock);
++
++ /* only a single device is supported per domain for now */
++ if (omap_domain->iommu_dev != oiommu) {
++ dev_err(dev, "invalid iommu device\n");
++ goto out;
++ }
++
++ iopgtable_clear_entry_all(oiommu);
++
++ omap_iommu_detach(oiommu);
++
++ omap_domain->iommu_dev = NULL;
++
++ out:
++ spin_unlock(&omap_domain->lock);
++ }
++
++ static int omap_iommu_domain_init(struct iommu_domain *domain)
++ {
++ struct omap_iommu_domain *omap_domain;
++
++ omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL);
++ if (!omap_domain) {
++ pr_err("kzalloc failed\n");
++ goto out;
++ }
++
++ omap_domain->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_KERNEL);
++ if (!omap_domain->pgtable) {
++ pr_err("kzalloc failed\n");
++ goto fail_nomem;
++ }
++
++ /*
++ * should never fail, but please keep this around to ensure
++ * we keep the hardware happy
++ */
++ BUG_ON(!IS_ALIGNED((long)omap_domain->pgtable, IOPGD_TABLE_SIZE));
++
++ clean_dcache_area(omap_domain->pgtable, IOPGD_TABLE_SIZE);
++ spin_lock_init(&omap_domain->lock);
++
++ domain->priv = omap_domain;
++
++ return 0;
++
++ fail_nomem:
++ kfree(omap_domain);
++ out:
++ return -ENOMEM;
++ }
++
++ /* assume device was already detached */
++ static void omap_iommu_domain_destroy(struct iommu_domain *domain)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++
++ domain->priv = NULL;
++
++ kfree(omap_domain->pgtable);
++ kfree(omap_domain);
++ }
++
++ static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
++ unsigned long da)
++ {
++ struct omap_iommu_domain *omap_domain = domain->priv;
++ struct omap_iommu *oiommu = omap_domain->iommu_dev;
++ struct device *dev = oiommu->dev;
++ u32 *pgd, *pte;
++ phys_addr_t ret = 0;
++
++ iopgtable_lookup_entry(oiommu, da, &pgd, &pte);
++
++ if (pte) {
++ if (iopte_is_small(*pte))
++ ret = omap_iommu_translate(*pte, da, IOPTE_MASK);
++ else if (iopte_is_large(*pte))
++ ret = omap_iommu_translate(*pte, da, IOLARGE_MASK);
++ else
++ dev_err(dev, "bogus pte 0x%x", *pte);
++ } else {
++ if (iopgd_is_section(*pgd))
++ ret = omap_iommu_translate(*pgd, da, IOSECTION_MASK);
++ else if (iopgd_is_super(*pgd))
++ ret = omap_iommu_translate(*pgd, da, IOSUPER_MASK);
++ else
++ dev_err(dev, "bogus pgd 0x%x", *pgd);
++ }
++
++ return ret;
++ }
++
++ static int omap_iommu_domain_has_cap(struct iommu_domain *domain,
++ unsigned long cap)
++ {
++ return 0;
++ }
++
++ static struct iommu_ops omap_iommu_ops = {
++ .domain_init = omap_iommu_domain_init,
++ .domain_destroy = omap_iommu_domain_destroy,
++ .attach_dev = omap_iommu_attach_dev,
++ .detach_dev = omap_iommu_detach_dev,
++ .map = omap_iommu_map,
++ .unmap = omap_iommu_unmap,
++ .iova_to_phys = omap_iommu_iova_to_phys,
++ .domain_has_cap = omap_iommu_domain_has_cap,
++ };
++
++ static int __init omap_iommu_init(void)
++ {
++ struct kmem_cache *p;
++ const unsigned long flags = SLAB_HWCACHE_ALIGN;
++ size_t align = 1 << 10; /* L2 pagetable alignement */
++
++ p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
++ iopte_cachep_ctor);
++ if (!p)
++ return -ENOMEM;
++ iopte_cachep = p;
++
-- register_iommu(&omap_iommu_ops);
++++ bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
++
++ return platform_driver_register(&omap_iommu_driver);
++ }
++ module_init(omap_iommu_init);
++
++ static void __exit omap_iommu_exit(void)
++ {
++ kmem_cache_destroy(iopte_cachep);
++
++ platform_driver_unregister(&omap_iommu_driver);
++ }
++ module_exit(omap_iommu_exit);
++
++ MODULE_DESCRIPTION("omap iommu: tlb and pagetable primitives");
++ MODULE_ALIAS("platform:omap-iommu");
++ MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
++ MODULE_LICENSE("GPL v2");
projects / linux-flexiantxendom0.git / commitdiff