+++ /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 "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 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;
-
-/**
- * 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 install_iommu_arch(const struct iommu_functions *ops)
-{
- if (arch_iommu)
- return -EBUSY;
-
- arch_iommu = ops;
- return 0;
-}
-EXPORT_SYMBOL_GPL(install_iommu_arch);
-
-/**
- * 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 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(uninstall_iommu_arch);
-
-/**
- * iommu_save_ctx - Save registers for pm off-mode support
- * @obj: target iommu
- **/
-void iommu_save_ctx(struct iommu *obj)
-{
- arch_iommu->save_ctx(obj);
-}
-EXPORT_SYMBOL_GPL(iommu_save_ctx);
-
-/**
- * iommu_restore_ctx - Restore registers for pm off-mode support
- * @obj: target iommu
- **/
-void iommu_restore_ctx(struct iommu *obj)
-{
- arch_iommu->restore_ctx(obj);
-}
-EXPORT_SYMBOL_GPL(iommu_restore_ctx);
-
-/**
- * iommu_arch_version - Return running iommu arch version
- **/
-u32 iommu_arch_version(void)
-{
- return arch_iommu->version;
-}
-EXPORT_SYMBOL_GPL(iommu_arch_version);
-
-static int iommu_enable(struct 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 iommu *obj)
-{
- if (!obj)
- return;
-
- clk_enable(obj->clk);
-
- arch_iommu->disable(obj);
-
- clk_disable(obj->clk);
-}
-
-/*
- * TLB operations
- */
-void 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(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 iommu *obj,
- struct iotlb_entry *e)
-{
- if (!e)
- return NULL;
-
- return arch_iommu->alloc_cr(obj, e);
-}
-
-u32 iotlb_cr_to_virt(struct cr_regs *cr)
-{
- return arch_iommu->cr_to_virt(cr);
-}
-EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);
-
-static u32 get_iopte_attr(struct iotlb_entry *e)
-{
- return arch_iommu->get_pte_attr(e);
-}
-
-static u32 iommu_report_fault(struct iommu *obj, u32 *da)
-{
- return arch_iommu->fault_isr(obj, da);
-}
-
-static void iotlb_lock_get(struct 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 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 iommu *obj, struct cr_regs *cr)
-{
- arch_iommu->tlb_read_cr(obj, cr);
-}
-
-static void iotlb_load_cr(struct 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 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 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
- **/
-int load_iotlb_entry(struct 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;
-}
-EXPORT_SYMBOL_GPL(load_iotlb_entry);
-
-/**
- * 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.
- **/
-void flush_iotlb_page(struct 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);
-}
-EXPORT_SYMBOL_GPL(flush_iotlb_page);
-
-/**
- * flush_iotlb_range - Clear an iommu tlb entries
- * @obj: target iommu
- * @start: iommu device virtual address(start)
- * @end: iommu device virtual address(end)
- *
- * Clear an iommu tlb entry which includes 'da' address.
- **/
-void flush_iotlb_range(struct iommu *obj, u32 start, u32 end)
-{
- u32 da = start;
-
- while (da < end) {
- flush_iotlb_page(obj, da);
- /* FIXME: Optimize for multiple page size */
- da += IOPTE_SIZE;
- }
-}
-EXPORT_SYMBOL_GPL(flush_iotlb_range);
-
-/**
- * flush_iotlb_all - Clear all iommu tlb entries
- * @obj: target iommu
- **/
-void flush_iotlb_all(struct 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);
-}
-EXPORT_SYMBOL_GPL(flush_iotlb_all);
-
-/**
- * iommu_set_twl - enable/disable table walking logic
- * @obj: target iommu
- * @on: enable/disable
- *
- * Function used to enable/disable TWL. If one wants to work
- * exclusively with locked TLB entries and receive notifications
- * for TLB miss then call this function to disable TWL.
- */
-void iommu_set_twl(struct iommu *obj, bool on)
-{
- clk_enable(obj->clk);
- arch_iommu->set_twl(obj, on);
- clk_disable(obj->clk);
-}
-EXPORT_SYMBOL_GPL(iommu_set_twl);
-
-#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
-
-ssize_t iommu_dump_ctx(struct 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(iommu_dump_ctx);
-
-static int __dump_tlb_entries(struct 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;
-}
-
-/**
- * dump_tlb_entries - dump cr arrays to given buffer
- * @obj: target iommu
- * @buf: output buffer
- **/
-size_t dump_tlb_entries(struct 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(dump_tlb_entries);
-
-int 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(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 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 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 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 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 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 iommu *obj, struct iotlb_entry *e)
-{
- int (*fn)(struct 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;
-}
-
-/**
- * iopgtable_store_entry - Make an iommu pte entry
- * @obj: target iommu
- * @e: an iommu tlb entry info
- **/
-int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e)
-{
- int err;
-
- flush_iotlb_page(obj, e->da);
- err = iopgtable_store_entry_core(obj, e);
-#ifdef PREFETCH_IOTLB
- if (!err)
- load_iotlb_entry(obj, e);
-#endif
- return err;
-}
-EXPORT_SYMBOL_GPL(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
- **/
-void iopgtable_lookup_entry(struct 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;
-}
-EXPORT_SYMBOL_GPL(iopgtable_lookup_entry);
-
-static size_t iopgtable_clear_entry_core(struct 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
- **/
-size_t iopgtable_clear_entry(struct 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;
-}
-EXPORT_SYMBOL_GPL(iopgtable_clear_entry);
-
-static void iopgtable_clear_entry_all(struct 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 iommu *obj = data;
-
- 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))
- 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 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;
-}
-
-/**
- * iommu_set_da_range - Set a valid device address range
- * @obj: target iommu
- * @start Start of valid range
- * @end End of valid range
- **/
-int iommu_set_da_range(struct iommu *obj, u32 start, u32 end)
-{
-
- if (!obj)
- return -EFAULT;
-
- if (end < start || !PAGE_ALIGN(start | end))
- return -EINVAL;
-
- obj->da_start = start;
- obj->da_end = end;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(iommu_set_da_range);
-
-/**
- * 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 iommu *omap_iommu_attach(struct device *dev, u32 *iopgd)
-{
- int err = -ENOMEM;
- struct 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 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 iommu_set_isr(const char *name,
- int (*isr)(struct iommu *obj, u32 da, u32 iommu_errs,
- void *priv),
- void *isr_priv)
-{
- struct device *dev;
- struct 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);
- mutex_lock(&obj->iommu_lock);
- if (obj->refcount != 0) {
- mutex_unlock(&obj->iommu_lock);
- return -EBUSY;
- }
- obj->isr = isr;
- obj->isr_priv = isr_priv;
- mutex_unlock(&obj->iommu_lock);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(iommu_set_isr);
-
-/*
- * OMAP Device MMU(IOMMU) detection
- */
-static int __devinit omap_iommu_probe(struct platform_device *pdev)
-{
- int err = -ENODEV;
- int irq;
- struct 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 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 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 = iopgtable_store_entry(oiommu, &e);
- if (ret) {
- dev_err(dev, "iopgtable_store_entry failed: %d\n", ret);
- return ret;
- }
-
- return 0;
-}
-
-static int omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
- int order)
-{
- struct omap_iommu_domain *omap_domain = domain->priv;
- struct iommu *oiommu = omap_domain->iommu_dev;
- struct device *dev = oiommu->dev;
- size_t bytes = PAGE_SIZE << order;
- size_t ret;
-
- dev_dbg(dev, "unmapping da 0x%lx size 0x%x\n", da, bytes);
-
- ret = iopgtable_clear_entry(oiommu, da);
- if (ret != bytes) {
- dev_err(dev, "entry @ 0x%lx was %d; not %d\n", da, ret, bytes);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static int
-omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
-{
- struct omap_iommu_domain *omap_domain = domain->priv;
- struct 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;
-
-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 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 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);
-
- 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");
git.samba.org / sfrench / cifs-2.6.git / blobdiff