linux-stable/drivers/iommu/omap-iommu.c
Robin Murphy 2d471b20c5 iommu: Streamline registration interface
Rather than have separate opaque setter functions that are easy to
overlook and lead to repetitive boilerplate in drivers, let's pass the
relevant initialisation parameters directly to iommu_device_register().

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/ab001b87c533b6f4db71eb90db6f888953986c36.1617285386.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2021-04-16 17:20:45 +02:00

1791 lines
41 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* omap iommu: tlb and pagetable primitives
*
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2013-2017 Texas Instruments Incorporated - https://www.ti.com/
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
* Paul Mundt and Toshihiro Kobayashi
*/
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/iommu.h>
#include <linux/omap-iommu.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_data/iommu-omap.h>
#include "omap-iopgtable.h"
#include "omap-iommu.h"
static const struct iommu_ops omap_iommu_ops;
#define to_iommu(dev) ((struct omap_iommu *)dev_get_drvdata(dev))
/* bitmap of the page sizes currently supported */
#define OMAP_IOMMU_PGSIZES (SZ_4K | SZ_64K | SZ_1M | SZ_16M)
#define MMU_LOCK_BASE_SHIFT 10
#define MMU_LOCK_BASE_MASK (0x1f << MMU_LOCK_BASE_SHIFT)
#define MMU_LOCK_BASE(x) \
((x & MMU_LOCK_BASE_MASK) >> MMU_LOCK_BASE_SHIFT)
#define MMU_LOCK_VICT_SHIFT 4
#define MMU_LOCK_VICT_MASK (0x1f << MMU_LOCK_VICT_SHIFT)
#define MMU_LOCK_VICT(x) \
((x & MMU_LOCK_VICT_MASK) >> MMU_LOCK_VICT_SHIFT)
static struct platform_driver omap_iommu_driver;
static struct kmem_cache *iopte_cachep;
/**
* to_omap_domain - Get struct omap_iommu_domain from generic iommu_domain
* @dom: generic iommu domain handle
**/
static struct omap_iommu_domain *to_omap_domain(struct iommu_domain *dom)
{
return container_of(dom, struct omap_iommu_domain, domain);
}
/**
* omap_iommu_save_ctx - Save registers for pm off-mode support
* @dev: client device
*
* This should be treated as an deprecated API. It is preserved only
* to maintain existing functionality for OMAP3 ISP driver.
**/
void omap_iommu_save_ctx(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
struct omap_iommu *obj;
u32 *p;
int i;
if (!arch_data)
return;
while (arch_data->iommu_dev) {
obj = arch_data->iommu_dev;
p = obj->ctx;
for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
p[i] = iommu_read_reg(obj, i * sizeof(u32));
dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
p[i]);
}
arch_data++;
}
}
EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);
/**
* omap_iommu_restore_ctx - Restore registers for pm off-mode support
* @dev: client device
*
* This should be treated as an deprecated API. It is preserved only
* to maintain existing functionality for OMAP3 ISP driver.
**/
void omap_iommu_restore_ctx(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
struct omap_iommu *obj;
u32 *p;
int i;
if (!arch_data)
return;
while (arch_data->iommu_dev) {
obj = arch_data->iommu_dev;
p = obj->ctx;
for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
iommu_write_reg(obj, p[i], i * sizeof(u32));
dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
p[i]);
}
arch_data++;
}
}
EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx);
static void dra7_cfg_dspsys_mmu(struct omap_iommu *obj, bool enable)
{
u32 val, mask;
if (!obj->syscfg)
return;
mask = (1 << (obj->id * DSP_SYS_MMU_CONFIG_EN_SHIFT));
val = enable ? mask : 0;
regmap_update_bits(obj->syscfg, DSP_SYS_MMU_CONFIG, mask, val);
}
static void __iommu_set_twl(struct omap_iommu *obj, bool on)
{
u32 l = iommu_read_reg(obj, MMU_CNTL);
if (on)
iommu_write_reg(obj, MMU_IRQ_TWL_MASK, MMU_IRQENABLE);
else
iommu_write_reg(obj, MMU_IRQ_TLB_MISS_MASK, MMU_IRQENABLE);
l &= ~MMU_CNTL_MASK;
if (on)
l |= (MMU_CNTL_MMU_EN | MMU_CNTL_TWL_EN);
else
l |= (MMU_CNTL_MMU_EN);
iommu_write_reg(obj, l, MMU_CNTL);
}
static int omap2_iommu_enable(struct omap_iommu *obj)
{
u32 l, pa;
if (!obj->iopgd || !IS_ALIGNED((unsigned long)obj->iopgd, SZ_16K))
return -EINVAL;
pa = virt_to_phys(obj->iopgd);
if (!IS_ALIGNED(pa, SZ_16K))
return -EINVAL;
l = iommu_read_reg(obj, MMU_REVISION);
dev_info(obj->dev, "%s: version %d.%d\n", obj->name,
(l >> 4) & 0xf, l & 0xf);
iommu_write_reg(obj, pa, MMU_TTB);
dra7_cfg_dspsys_mmu(obj, true);
if (obj->has_bus_err_back)
iommu_write_reg(obj, MMU_GP_REG_BUS_ERR_BACK_EN, MMU_GP_REG);
__iommu_set_twl(obj, true);
return 0;
}
static void omap2_iommu_disable(struct omap_iommu *obj)
{
u32 l = iommu_read_reg(obj, MMU_CNTL);
l &= ~MMU_CNTL_MASK;
iommu_write_reg(obj, l, MMU_CNTL);
dra7_cfg_dspsys_mmu(obj, false);
dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
}
static int iommu_enable(struct omap_iommu *obj)
{
int ret;
ret = pm_runtime_get_sync(obj->dev);
if (ret < 0)
pm_runtime_put_noidle(obj->dev);
return ret < 0 ? ret : 0;
}
static void iommu_disable(struct omap_iommu *obj)
{
pm_runtime_put_sync(obj->dev);
}
/*
* TLB operations
*/
static u32 iotlb_cr_to_virt(struct cr_regs *cr)
{
u32 page_size = cr->cam & MMU_CAM_PGSZ_MASK;
u32 mask = get_cam_va_mask(cr->cam & page_size);
return cr->cam & mask;
}
static u32 get_iopte_attr(struct iotlb_entry *e)
{
u32 attr;
attr = e->mixed << 5;
attr |= e->endian;
attr |= e->elsz >> 3;
attr <<= (((e->pgsz == MMU_CAM_PGSZ_4K) ||
(e->pgsz == MMU_CAM_PGSZ_64K)) ? 0 : 6);
return attr;
}
static u32 iommu_report_fault(struct omap_iommu *obj, u32 *da)
{
u32 status, fault_addr;
status = iommu_read_reg(obj, MMU_IRQSTATUS);
status &= MMU_IRQ_MASK;
if (!status) {
*da = 0;
return 0;
}
fault_addr = iommu_read_reg(obj, MMU_FAULT_AD);
*da = fault_addr;
iommu_write_reg(obj, status, MMU_IRQSTATUS);
return status;
}
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);
}
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)
{
cr->cam = iommu_read_reg(obj, MMU_READ_CAM);
cr->ram = iommu_read_reg(obj, MMU_READ_RAM);
}
static void iotlb_load_cr(struct omap_iommu *obj, struct cr_regs *cr)
{
iommu_write_reg(obj, cr->cam | MMU_CAM_V, MMU_CAM);
iommu_write_reg(obj, cr->ram, MMU_RAM);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
iommu_write_reg(obj, 1, MMU_LD_TLB);
}
/* only used in iotlb iteration for-loop */
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;
}
#ifdef PREFETCH_IOTLB
static struct cr_regs *iotlb_alloc_cr(struct omap_iommu *obj,
struct iotlb_entry *e)
{
struct cr_regs *cr;
if (!e)
return NULL;
if (e->da & ~(get_cam_va_mask(e->pgsz))) {
dev_err(obj->dev, "%s:\twrong alignment: %08x\n", __func__,
e->da);
return ERR_PTR(-EINVAL);
}
cr = kmalloc(sizeof(*cr), GFP_KERNEL);
if (!cr)
return ERR_PTR(-ENOMEM);
cr->cam = (e->da & MMU_CAM_VATAG_MASK) | e->prsvd | e->pgsz | e->valid;
cr->ram = e->pa | e->endian | e->elsz | e->mixed;
return cr;
}
/**
* load_iotlb_entry - Set an iommu tlb entry
* @obj: target iommu
* @e: an iommu tlb entry info
**/
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;
pm_runtime_get_sync(obj->dev);
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)) {
pm_runtime_put_sync(obj->dev);
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:
pm_runtime_put_sync(obj->dev);
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;
pm_runtime_get_sync(obj->dev);
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(%zx)\n",
__func__, start, da, bytes);
iotlb_load_cr(obj, &cr);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
break;
}
}
pm_runtime_put_sync(obj->dev);
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;
pm_runtime_get_sync(obj->dev);
l.base = 0;
l.vict = 0;
iotlb_lock_set(obj, &l);
iommu_write_reg(obj, 1, MMU_GFLUSH);
pm_runtime_put_sync(obj->dev);
}
/*
* H/W pagetable operations
*/
static void flush_iopte_range(struct device *dev, dma_addr_t dma,
unsigned long offset, int num_entries)
{
size_t size = num_entries * sizeof(u32);
dma_sync_single_range_for_device(dev, dma, offset, size, DMA_TO_DEVICE);
}
static void iopte_free(struct omap_iommu *obj, u32 *iopte, bool dma_valid)
{
dma_addr_t pt_dma;
/* Note: freed iopte's must be clean ready for re-use */
if (iopte) {
if (dma_valid) {
pt_dma = virt_to_phys(iopte);
dma_unmap_single(obj->dev, pt_dma, IOPTE_TABLE_SIZE,
DMA_TO_DEVICE);
}
kmem_cache_free(iopte_cachep, iopte);
}
}
static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd,
dma_addr_t *pt_dma, u32 da)
{
u32 *iopte;
unsigned long offset = iopgd_index(da) * sizeof(da);
/* 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);
*pt_dma = dma_map_single(obj->dev, iopte, IOPTE_TABLE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(obj->dev, *pt_dma)) {
dev_err(obj->dev, "DMA map error for L2 table\n");
iopte_free(obj, iopte, false);
return ERR_PTR(-ENOMEM);
}
/*
* we rely on dma address and the physical address to be
* the same for mapping the L2 table
*/
if (WARN_ON(*pt_dma != virt_to_phys(iopte))) {
dev_err(obj->dev, "DMA translation error for L2 table\n");
dma_unmap_single(obj->dev, *pt_dma, IOPTE_TABLE_SIZE,
DMA_TO_DEVICE);
iopte_free(obj, iopte, false);
return ERR_PTR(-ENOMEM);
}
*iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
} else {
/* We raced, free the reduniovant table */
iopte_free(obj, iopte, false);
}
pte_ready:
iopte = iopte_offset(iopgd, da);
*pt_dma = iopgd_page_paddr(iopgd);
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);
unsigned long offset = iopgd_index(da) * sizeof(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_iopte_range(obj->dev, obj->pd_dma, offset, 1);
return 0;
}
static int iopgd_alloc_super(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
unsigned long offset = iopgd_index(da) * sizeof(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_iopte_range(obj->dev, obj->pd_dma, offset, 16);
return 0;
}
static int iopte_alloc_page(struct omap_iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
dma_addr_t pt_dma;
u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da);
unsigned long offset = iopte_index(da) * sizeof(da);
if (IS_ERR(iopte))
return PTR_ERR(iopte);
*iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
flush_iopte_range(obj->dev, pt_dma, offset, 1);
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);
dma_addr_t pt_dma;
u32 *iopte = iopte_alloc(obj, iopgd, &pt_dma, da);
unsigned long offset = iopte_index(da) * sizeof(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(obj->dev, pt_dma, offset, 16);
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;
break;
}
if (WARN_ON(!fn))
return -EINVAL;
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
**/
static 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;
}
/**
* 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;
dma_addr_t pt_dma;
unsigned long pd_offset = iopgd_index(da) * sizeof(da);
unsigned long pt_offset = iopte_index(da) * sizeof(da);
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));
pt_dma = iopgd_page_paddr(iopgd);
flush_iopte_range(obj->dev, pt_dma, pt_offset, nent);
/*
* 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(obj, iopte, true);
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_iopte_range(obj->dev, obj->pd_dma, pd_offset, nent);
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)
{
unsigned long offset;
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);
offset = iopgd_index(da) * sizeof(da);
if (!*iopgd)
continue;
if (iopgd_is_table(*iopgd))
iopte_free(obj, iopte_offset(iopgd, 0), true);
*iopgd = 0;
flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
}
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;
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
if (!omap_domain->dev)
return IRQ_NONE;
errs = iommu_report_fault(obj, &da);
if (errs == 0)
return IRQ_HANDLED;
/* Fault callback or TLB/PTE Dynamic loading */
if (!report_iommu_fault(domain, obj->dev, da, 0))
return IRQ_HANDLED;
iommu_write_reg(obj, 0, MMU_IRQENABLE);
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;
}
/**
* omap_iommu_attach() - attach iommu device to an iommu domain
* @obj: target omap iommu device
* @iopgd: page table
**/
static int omap_iommu_attach(struct omap_iommu *obj, u32 *iopgd)
{
int err;
spin_lock(&obj->iommu_lock);
obj->pd_dma = dma_map_single(obj->dev, iopgd, IOPGD_TABLE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(obj->dev, obj->pd_dma)) {
dev_err(obj->dev, "DMA map error for L1 table\n");
err = -ENOMEM;
goto out_err;
}
obj->iopgd = iopgd;
err = iommu_enable(obj);
if (err)
goto out_err;
flush_iotlb_all(obj);
spin_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
return 0;
out_err:
spin_unlock(&obj->iommu_lock);
return 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);
dma_unmap_single(obj->dev, obj->pd_dma, IOPGD_TABLE_SIZE,
DMA_TO_DEVICE);
obj->pd_dma = 0;
obj->iopgd = NULL;
iommu_disable(obj);
spin_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
}
static void omap_iommu_save_tlb_entries(struct omap_iommu *obj)
{
struct iotlb_lock lock;
struct cr_regs cr;
struct cr_regs *tmp;
int i;
/* check if there are any locked tlbs to save */
iotlb_lock_get(obj, &lock);
obj->num_cr_ctx = lock.base;
if (!obj->num_cr_ctx)
return;
tmp = obj->cr_ctx;
for_each_iotlb_cr(obj, obj->num_cr_ctx, i, cr)
* tmp++ = cr;
}
static void omap_iommu_restore_tlb_entries(struct omap_iommu *obj)
{
struct iotlb_lock l;
struct cr_regs *tmp;
int i;
/* no locked tlbs to restore */
if (!obj->num_cr_ctx)
return;
l.base = 0;
tmp = obj->cr_ctx;
for (i = 0; i < obj->num_cr_ctx; i++, tmp++) {
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_load_cr(obj, tmp);
}
l.base = obj->num_cr_ctx;
l.vict = i;
iotlb_lock_set(obj, &l);
}
/**
* omap_iommu_domain_deactivate - deactivate attached iommu devices
* @domain: iommu domain attached to the target iommu device
*
* This API allows the client devices of IOMMU devices to suspend
* the IOMMUs they control at runtime, after they are idled and
* suspended all activity. System Suspend will leverage the PM
* driver late callbacks.
**/
int omap_iommu_domain_deactivate(struct iommu_domain *domain)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
int i;
if (!omap_domain->dev)
return 0;
iommu = omap_domain->iommus;
iommu += (omap_domain->num_iommus - 1);
for (i = 0; i < omap_domain->num_iommus; i++, iommu--) {
oiommu = iommu->iommu_dev;
pm_runtime_put_sync(oiommu->dev);
}
return 0;
}
EXPORT_SYMBOL_GPL(omap_iommu_domain_deactivate);
/**
* omap_iommu_domain_activate - activate attached iommu devices
* @domain: iommu domain attached to the target iommu device
*
* This API allows the client devices of IOMMU devices to resume the
* IOMMUs they control at runtime, before they can resume operations.
* System Resume will leverage the PM driver late callbacks.
**/
int omap_iommu_domain_activate(struct iommu_domain *domain)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
int i;
if (!omap_domain->dev)
return 0;
iommu = omap_domain->iommus;
for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
oiommu = iommu->iommu_dev;
pm_runtime_get_sync(oiommu->dev);
}
return 0;
}
EXPORT_SYMBOL_GPL(omap_iommu_domain_activate);
/**
* omap_iommu_runtime_suspend - disable an iommu device
* @dev: iommu device
*
* This function performs all that is necessary to disable an
* IOMMU device, either during final detachment from a client
* device, or during system/runtime suspend of the device. This
* includes programming all the appropriate IOMMU registers, and
* managing the associated omap_hwmod's state and the device's
* reset line. This function also saves the context of any
* locked TLBs if suspending.
**/
static __maybe_unused int omap_iommu_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct iommu_platform_data *pdata = dev_get_platdata(dev);
struct omap_iommu *obj = to_iommu(dev);
int ret;
/* save the TLBs only during suspend, and not for power down */
if (obj->domain && obj->iopgd)
omap_iommu_save_tlb_entries(obj);
omap2_iommu_disable(obj);
if (pdata && pdata->device_idle)
pdata->device_idle(pdev);
if (pdata && pdata->assert_reset)
pdata->assert_reset(pdev, pdata->reset_name);
if (pdata && pdata->set_pwrdm_constraint) {
ret = pdata->set_pwrdm_constraint(pdev, false, &obj->pwrst);
if (ret) {
dev_warn(obj->dev, "pwrdm_constraint failed to be reset, status = %d\n",
ret);
}
}
return 0;
}
/**
* omap_iommu_runtime_resume - enable an iommu device
* @dev: iommu device
*
* This function performs all that is necessary to enable an
* IOMMU device, either during initial attachment to a client
* device, or during system/runtime resume of the device. This
* includes programming all the appropriate IOMMU registers, and
* managing the associated omap_hwmod's state and the device's
* reset line. The function also restores any locked TLBs if
* resuming after a suspend.
**/
static __maybe_unused int omap_iommu_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct iommu_platform_data *pdata = dev_get_platdata(dev);
struct omap_iommu *obj = to_iommu(dev);
int ret = 0;
if (pdata && pdata->set_pwrdm_constraint) {
ret = pdata->set_pwrdm_constraint(pdev, true, &obj->pwrst);
if (ret) {
dev_warn(obj->dev, "pwrdm_constraint failed to be set, status = %d\n",
ret);
}
}
if (pdata && pdata->deassert_reset) {
ret = pdata->deassert_reset(pdev, pdata->reset_name);
if (ret) {
dev_err(dev, "deassert_reset failed: %d\n", ret);
return ret;
}
}
if (pdata && pdata->device_enable)
pdata->device_enable(pdev);
/* restore the TLBs only during resume, and not for power up */
if (obj->domain)
omap_iommu_restore_tlb_entries(obj);
ret = omap2_iommu_enable(obj);
return ret;
}
/**
* omap_iommu_suspend_prepare - prepare() dev_pm_ops implementation
* @dev: iommu device
*
* This function performs the necessary checks to determine if the IOMMU
* device needs suspending or not. The function checks if the runtime_pm
* status of the device is suspended, and returns 1 in that case. This
* results in the PM core to skip invoking any of the Sleep PM callbacks
* (suspend, suspend_late, resume, resume_early etc).
*/
static int omap_iommu_prepare(struct device *dev)
{
if (pm_runtime_status_suspended(dev))
return 1;
return 0;
}
static bool omap_iommu_can_register(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
return true;
/*
* restrict IOMMU core registration only for processor-port MDMA MMUs
* on DRA7 DSPs
*/
if ((!strcmp(dev_name(&pdev->dev), "40d01000.mmu")) ||
(!strcmp(dev_name(&pdev->dev), "41501000.mmu")))
return true;
return false;
}
static int omap_iommu_dra7_get_dsp_system_cfg(struct platform_device *pdev,
struct omap_iommu *obj)
{
struct device_node *np = pdev->dev.of_node;
int ret;
if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
return 0;
if (!of_property_read_bool(np, "ti,syscon-mmuconfig")) {
dev_err(&pdev->dev, "ti,syscon-mmuconfig property is missing\n");
return -EINVAL;
}
obj->syscfg =
syscon_regmap_lookup_by_phandle(np, "ti,syscon-mmuconfig");
if (IS_ERR(obj->syscfg)) {
/* can fail with -EPROBE_DEFER */
ret = PTR_ERR(obj->syscfg);
return ret;
}
if (of_property_read_u32_index(np, "ti,syscon-mmuconfig", 1,
&obj->id)) {
dev_err(&pdev->dev, "couldn't get the IOMMU instance id within subsystem\n");
return -EINVAL;
}
if (obj->id != 0 && obj->id != 1) {
dev_err(&pdev->dev, "invalid IOMMU instance id\n");
return -EINVAL;
}
return 0;
}
/*
* OMAP Device MMU(IOMMU) detection
*/
static int omap_iommu_probe(struct platform_device *pdev)
{
int err = -ENODEV;
int irq;
struct omap_iommu *obj;
struct resource *res;
struct device_node *of = pdev->dev.of_node;
if (!of) {
pr_err("%s: only DT-based devices are supported\n", __func__);
return -ENODEV;
}
obj = devm_kzalloc(&pdev->dev, sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
if (!obj)
return -ENOMEM;
/*
* self-manage the ordering dependencies between omap_device_enable/idle
* and omap_device_assert/deassert_hardreset API
*/
if (pdev->dev.pm_domain) {
dev_dbg(&pdev->dev, "device pm_domain is being reset\n");
pdev->dev.pm_domain = NULL;
}
obj->name = dev_name(&pdev->dev);
obj->nr_tlb_entries = 32;
err = of_property_read_u32(of, "ti,#tlb-entries", &obj->nr_tlb_entries);
if (err && err != -EINVAL)
return err;
if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8)
return -EINVAL;
if (of_find_property(of, "ti,iommu-bus-err-back", NULL))
obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN;
obj->dev = &pdev->dev;
obj->ctx = (void *)obj + sizeof(*obj);
obj->cr_ctx = devm_kzalloc(&pdev->dev,
sizeof(*obj->cr_ctx) * obj->nr_tlb_entries,
GFP_KERNEL);
if (!obj->cr_ctx)
return -ENOMEM;
spin_lock_init(&obj->iommu_lock);
spin_lock_init(&obj->page_table_lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
obj->regbase = devm_ioremap_resource(obj->dev, res);
if (IS_ERR(obj->regbase))
return PTR_ERR(obj->regbase);
err = omap_iommu_dra7_get_dsp_system_cfg(pdev, obj);
if (err)
return err;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -ENODEV;
err = devm_request_irq(obj->dev, irq, iommu_fault_handler, IRQF_SHARED,
dev_name(obj->dev), obj);
if (err < 0)
return err;
platform_set_drvdata(pdev, obj);
if (omap_iommu_can_register(pdev)) {
obj->group = iommu_group_alloc();
if (IS_ERR(obj->group))
return PTR_ERR(obj->group);
err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL,
obj->name);
if (err)
goto out_group;
err = iommu_device_register(&obj->iommu, &omap_iommu_ops, &pdev->dev);
if (err)
goto out_sysfs;
}
pm_runtime_enable(obj->dev);
omap_iommu_debugfs_add(obj);
dev_info(&pdev->dev, "%s registered\n", obj->name);
/* Re-probe bus to probe device attached to this IOMMU */
bus_iommu_probe(&platform_bus_type);
return 0;
out_sysfs:
iommu_device_sysfs_remove(&obj->iommu);
out_group:
iommu_group_put(obj->group);
return err;
}
static int omap_iommu_remove(struct platform_device *pdev)
{
struct omap_iommu *obj = platform_get_drvdata(pdev);
if (obj->group) {
iommu_group_put(obj->group);
obj->group = NULL;
iommu_device_sysfs_remove(&obj->iommu);
iommu_device_unregister(&obj->iommu);
}
omap_iommu_debugfs_remove(obj);
pm_runtime_disable(obj->dev);
dev_info(&pdev->dev, "%s removed\n", obj->name);
return 0;
}
static const struct dev_pm_ops omap_iommu_pm_ops = {
.prepare = omap_iommu_prepare,
SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(omap_iommu_runtime_suspend,
omap_iommu_runtime_resume, NULL)
};
static const struct of_device_id omap_iommu_of_match[] = {
{ .compatible = "ti,omap2-iommu" },
{ .compatible = "ti,omap4-iommu" },
{ .compatible = "ti,dra7-iommu" },
{ .compatible = "ti,dra7-dsp-iommu" },
{},
};
static struct platform_driver omap_iommu_driver = {
.probe = omap_iommu_probe,
.remove = omap_iommu_remove,
.driver = {
.name = "omap-iommu",
.pm = &omap_iommu_pm_ops,
.of_match_table = of_match_ptr(omap_iommu_of_match),
},
};
static u32 iotlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa, int pgsz)
{
memset(e, 0, sizeof(*e));
e->da = da;
e->pa = pa;
e->valid = MMU_CAM_V;
e->pgsz = pgsz;
e->endian = MMU_RAM_ENDIAN_LITTLE;
e->elsz = MMU_RAM_ELSZ_8;
e->mixed = 0;
return iopgsz_to_bytes(e->pgsz);
}
static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
phys_addr_t pa, size_t bytes, int prot, gfp_t gfp)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct device *dev = omap_domain->dev;
struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
struct iotlb_entry e;
int omap_pgsz;
u32 ret = -EINVAL;
int i;
omap_pgsz = bytes_to_iopgsz(bytes);
if (omap_pgsz < 0) {
dev_err(dev, "invalid size to map: %zu\n", bytes);
return -EINVAL;
}
dev_dbg(dev, "mapping da 0x%lx to pa %pa size 0x%zx\n", da, &pa, bytes);
iotlb_init_entry(&e, da, pa, omap_pgsz);
iommu = omap_domain->iommus;
for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
oiommu = iommu->iommu_dev;
ret = omap_iopgtable_store_entry(oiommu, &e);
if (ret) {
dev_err(dev, "omap_iopgtable_store_entry failed: %d\n",
ret);
break;
}
}
if (ret) {
while (i--) {
iommu--;
oiommu = iommu->iommu_dev;
iopgtable_clear_entry(oiommu, da);
}
}
return ret;
}
static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
size_t size, struct iommu_iotlb_gather *gather)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct device *dev = omap_domain->dev;
struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
bool error = false;
size_t bytes = 0;
int i;
dev_dbg(dev, "unmapping da 0x%lx size %zu\n", da, size);
iommu = omap_domain->iommus;
for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
oiommu = iommu->iommu_dev;
bytes = iopgtable_clear_entry(oiommu, da);
if (!bytes)
error = true;
}
/*
* simplify return - we are only checking if any of the iommus
* reported an error, but not if all of them are unmapping the
* same number of entries. This should not occur due to the
* mirror programming.
*/
return error ? 0 : bytes;
}
static int omap_iommu_count(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
int count = 0;
while (arch_data->iommu_dev) {
count++;
arch_data++;
}
return count;
}
/* caller should call cleanup if this function fails */
static int omap_iommu_attach_init(struct device *dev,
struct omap_iommu_domain *odomain)
{
struct omap_iommu_device *iommu;
int i;
odomain->num_iommus = omap_iommu_count(dev);
if (!odomain->num_iommus)
return -EINVAL;
odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu),
GFP_ATOMIC);
if (!odomain->iommus)
return -ENOMEM;
iommu = odomain->iommus;
for (i = 0; i < odomain->num_iommus; i++, iommu++) {
iommu->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_ATOMIC);
if (!iommu->pgtable)
return -ENOMEM;
/*
* should never fail, but please keep this around to ensure
* we keep the hardware happy
*/
if (WARN_ON(!IS_ALIGNED((long)iommu->pgtable,
IOPGD_TABLE_SIZE)))
return -EINVAL;
}
return 0;
}
static void omap_iommu_detach_fini(struct omap_iommu_domain *odomain)
{
int i;
struct omap_iommu_device *iommu = odomain->iommus;
for (i = 0; iommu && i < odomain->num_iommus; i++, iommu++)
kfree(iommu->pgtable);
kfree(odomain->iommus);
odomain->num_iommus = 0;
odomain->iommus = NULL;
}
static int
omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
int ret = 0;
int i;
if (!arch_data || !arch_data->iommu_dev) {
dev_err(dev, "device doesn't have an associated iommu\n");
return -EINVAL;
}
spin_lock(&omap_domain->lock);
/* only a single client device can be attached to a domain */
if (omap_domain->dev) {
dev_err(dev, "iommu domain is already attached\n");
ret = -EBUSY;
goto out;
}
ret = omap_iommu_attach_init(dev, omap_domain);
if (ret) {
dev_err(dev, "failed to allocate required iommu data %d\n",
ret);
goto init_fail;
}
iommu = omap_domain->iommus;
for (i = 0; i < omap_domain->num_iommus; i++, iommu++, arch_data++) {
/* configure and enable the omap iommu */
oiommu = arch_data->iommu_dev;
ret = omap_iommu_attach(oiommu, iommu->pgtable);
if (ret) {
dev_err(dev, "can't get omap iommu: %d\n", ret);
goto attach_fail;
}
oiommu->domain = domain;
iommu->iommu_dev = oiommu;
}
omap_domain->dev = dev;
goto out;
attach_fail:
while (i--) {
iommu--;
arch_data--;
oiommu = iommu->iommu_dev;
omap_iommu_detach(oiommu);
iommu->iommu_dev = NULL;
oiommu->domain = NULL;
}
init_fail:
omap_iommu_detach_fini(omap_domain);
out:
spin_unlock(&omap_domain->lock);
return ret;
}
static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
struct omap_iommu_device *iommu = omap_domain->iommus;
struct omap_iommu *oiommu;
int i;
if (!omap_domain->dev) {
dev_err(dev, "domain has no attached device\n");
return;
}
/* only a single device is supported per domain for now */
if (omap_domain->dev != dev) {
dev_err(dev, "invalid attached device\n");
return;
}
/*
* cleanup in the reverse order of attachment - this addresses
* any h/w dependencies between multiple instances, if any
*/
iommu += (omap_domain->num_iommus - 1);
arch_data += (omap_domain->num_iommus - 1);
for (i = 0; i < omap_domain->num_iommus; i++, iommu--, arch_data--) {
oiommu = iommu->iommu_dev;
iopgtable_clear_entry_all(oiommu);
omap_iommu_detach(oiommu);
iommu->iommu_dev = NULL;
oiommu->domain = NULL;
}
omap_iommu_detach_fini(omap_domain);
omap_domain->dev = NULL;
}
static void omap_iommu_detach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
spin_lock(&omap_domain->lock);
_omap_iommu_detach_dev(omap_domain, dev);
spin_unlock(&omap_domain->lock);
}
static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
{
struct omap_iommu_domain *omap_domain;
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL);
if (!omap_domain)
return NULL;
spin_lock_init(&omap_domain->lock);
omap_domain->domain.geometry.aperture_start = 0;
omap_domain->domain.geometry.aperture_end = (1ULL << 32) - 1;
omap_domain->domain.geometry.force_aperture = true;
return &omap_domain->domain;
}
static void omap_iommu_domain_free(struct iommu_domain *domain)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
/*
* An iommu device is still attached
* (currently, only one device can be attached) ?
*/
if (omap_domain->dev)
_omap_iommu_detach_dev(omap_domain, omap_domain->dev);
kfree(omap_domain);
}
static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t da)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_device *iommu = omap_domain->iommus;
struct omap_iommu *oiommu = iommu->iommu_dev;
struct device *dev = oiommu->dev;
u32 *pgd, *pte;
phys_addr_t ret = 0;
/*
* all the iommus within the domain will have identical programming,
* so perform the lookup using just the first iommu
*/
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, da 0x%llx", *pte,
(unsigned long long)da);
} 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, da 0x%llx", *pgd,
(unsigned long long)da);
}
return ret;
}
static struct iommu_device *omap_iommu_probe_device(struct device *dev)
{
struct omap_iommu_arch_data *arch_data, *tmp;
struct platform_device *pdev;
struct omap_iommu *oiommu;
struct device_node *np;
int num_iommus, i;
/*
* Allocate the per-device iommu structure for DT-based devices.
*
* TODO: Simplify this when removing non-DT support completely from the
* IOMMU users.
*/
if (!dev->of_node)
return ERR_PTR(-ENODEV);
/*
* retrieve the count of IOMMU nodes using phandle size as element size
* since #iommu-cells = 0 for OMAP
*/
num_iommus = of_property_count_elems_of_size(dev->of_node, "iommus",
sizeof(phandle));
if (num_iommus < 0)
return 0;
arch_data = kcalloc(num_iommus + 1, sizeof(*arch_data), GFP_KERNEL);
if (!arch_data)
return ERR_PTR(-ENOMEM);
for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) {
np = of_parse_phandle(dev->of_node, "iommus", i);
if (!np) {
kfree(arch_data);
return ERR_PTR(-EINVAL);
}
pdev = of_find_device_by_node(np);
if (!pdev) {
of_node_put(np);
kfree(arch_data);
return ERR_PTR(-ENODEV);
}
oiommu = platform_get_drvdata(pdev);
if (!oiommu) {
of_node_put(np);
kfree(arch_data);
return ERR_PTR(-EINVAL);
}
tmp->iommu_dev = oiommu;
tmp->dev = &pdev->dev;
of_node_put(np);
}
dev_iommu_priv_set(dev, arch_data);
/*
* use the first IOMMU alone for the sysfs device linking.
* TODO: Evaluate if a single iommu_group needs to be
* maintained for both IOMMUs
*/
oiommu = arch_data->iommu_dev;
return &oiommu->iommu;
}
static void omap_iommu_release_device(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
if (!dev->of_node || !arch_data)
return;
dev_iommu_priv_set(dev, NULL);
kfree(arch_data);
}
static struct iommu_group *omap_iommu_device_group(struct device *dev)
{
struct omap_iommu_arch_data *arch_data = dev_iommu_priv_get(dev);
struct iommu_group *group = ERR_PTR(-EINVAL);
if (!arch_data)
return ERR_PTR(-ENODEV);
if (arch_data->iommu_dev)
group = iommu_group_ref_get(arch_data->iommu_dev->group);
return group;
}
static const struct iommu_ops omap_iommu_ops = {
.domain_alloc = omap_iommu_domain_alloc,
.domain_free = omap_iommu_domain_free,
.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,
.probe_device = omap_iommu_probe_device,
.release_device = omap_iommu_release_device,
.device_group = omap_iommu_device_group,
.pgsize_bitmap = OMAP_IOMMU_PGSIZES,
};
static int __init omap_iommu_init(void)
{
struct kmem_cache *p;
const slab_flags_t flags = SLAB_HWCACHE_ALIGN;
size_t align = 1 << 10; /* L2 pagetable alignement */
struct device_node *np;
int ret;
np = of_find_matching_node(NULL, omap_iommu_of_match);
if (!np)
return 0;
of_node_put(np);
p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
NULL);
if (!p)
return -ENOMEM;
iopte_cachep = p;
omap_iommu_debugfs_init();
ret = platform_driver_register(&omap_iommu_driver);
if (ret) {
pr_err("%s: failed to register driver\n", __func__);
goto fail_driver;
}
ret = bus_set_iommu(&platform_bus_type, &omap_iommu_ops);
if (ret)
goto fail_bus;
return 0;
fail_bus:
platform_driver_unregister(&omap_iommu_driver);
fail_driver:
kmem_cache_destroy(iopte_cachep);
return ret;
}
subsys_initcall(omap_iommu_init);
/* must be ready before omap3isp is probed */