* published by the Free Software Foundation.
*/
-#include <asm/cacheflush.h>
-#include <asm/pgtable.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/dma-iommu.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/io.h>
struct rk_iommu_domain {
struct list_head iommus;
+ struct platform_device *pdev;
u32 *dt; /* page directory table */
+ dma_addr_t dt_dma;
spinlock_t iommus_lock; /* lock for iommus list */
spinlock_t dt_lock; /* lock for modifying page directory table */
struct iommu_domain *domain; /* domain to which iommu is attached */
};
-static inline void rk_table_flush(u32 *va, unsigned int count)
+static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
+ unsigned int count)
{
- phys_addr_t pa_start = virt_to_phys(va);
- phys_addr_t pa_end = virt_to_phys(va + count);
- size_t size = pa_end - pa_start;
+ size_t size = count * sizeof(u32); /* count of u32 entry */
- __cpuc_flush_dcache_area(va, size);
- outer_flush_range(pa_start, pa_end);
+ dma_sync_single_for_device(&dom->pdev->dev, dma, size, DMA_TO_DEVICE);
}
static struct rk_iommu_domain *to_rk_domain(struct iommu_domain *dom)
return dte & RK_DTE_PT_VALID;
}
-static u32 rk_mk_dte(u32 *pt)
+static inline u32 rk_mk_dte(dma_addr_t pt_dma)
{
- phys_addr_t pt_phys = virt_to_phys(pt);
- return (pt_phys & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID;
+ return (pt_dma & RK_DTE_PT_ADDRESS_MASK) | RK_DTE_PT_VALID;
}
/*
static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain,
dma_addr_t iova)
{
+ struct device *dev = &rk_domain->pdev->dev;
u32 *page_table, *dte_addr;
- u32 dte;
+ u32 dte_index, dte;
phys_addr_t pt_phys;
+ dma_addr_t pt_dma;
assert_spin_locked(&rk_domain->dt_lock);
- dte_addr = &rk_domain->dt[rk_iova_dte_index(iova)];
+ dte_index = rk_iova_dte_index(iova);
+ dte_addr = &rk_domain->dt[dte_index];
dte = *dte_addr;
if (rk_dte_is_pt_valid(dte))
goto done;
if (!page_table)
return ERR_PTR(-ENOMEM);
- dte = rk_mk_dte(page_table);
- *dte_addr = dte;
+ pt_dma = dma_map_single(dev, page_table, SPAGE_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, pt_dma)) {
+ dev_err(dev, "DMA mapping error while allocating page table\n");
+ free_page((unsigned long)page_table);
+ return ERR_PTR(-ENOMEM);
+ }
- rk_table_flush(page_table, NUM_PT_ENTRIES);
- rk_table_flush(dte_addr, 1);
+ dte = rk_mk_dte(pt_dma);
+ *dte_addr = dte;
+ rk_table_flush(rk_domain, pt_dma, NUM_PT_ENTRIES);
+ rk_table_flush(rk_domain,
+ rk_domain->dt_dma + dte_index * sizeof(u32), 1);
done:
pt_phys = rk_dte_pt_address(dte);
return (u32 *)phys_to_virt(pt_phys);
}
static size_t rk_iommu_unmap_iova(struct rk_iommu_domain *rk_domain,
- u32 *pte_addr, dma_addr_t iova, size_t size)
+ u32 *pte_addr, dma_addr_t pte_dma,
+ size_t size)
{
unsigned int pte_count;
unsigned int pte_total = size / SPAGE_SIZE;
pte_addr[pte_count] = rk_mk_pte_invalid(pte);
}
- rk_table_flush(pte_addr, pte_count);
+ rk_table_flush(rk_domain, pte_dma, pte_count);
return pte_count * SPAGE_SIZE;
}
static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr,
- dma_addr_t iova, phys_addr_t paddr, size_t size,
- int prot)
+ dma_addr_t pte_dma, dma_addr_t iova,
+ phys_addr_t paddr, size_t size, int prot)
{
unsigned int pte_count;
unsigned int pte_total = size / SPAGE_SIZE;
paddr += SPAGE_SIZE;
}
- rk_table_flush(pte_addr, pte_count);
+ rk_table_flush(rk_domain, pte_dma, pte_total);
/*
* Zap the first and last iova to evict from iotlb any previously
return 0;
unwind:
/* Unmap the range of iovas that we just mapped */
- rk_iommu_unmap_iova(rk_domain, pte_addr, iova, pte_count * SPAGE_SIZE);
+ rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma,
+ pte_count * SPAGE_SIZE);
iova += pte_count * SPAGE_SIZE;
page_phys = rk_pte_page_address(pte_addr[pte_count]);
{
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
unsigned long flags;
- dma_addr_t iova = (dma_addr_t)_iova;
+ dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
u32 *page_table, *pte_addr;
+ u32 dte_index, pte_index;
int ret;
spin_lock_irqsave(&rk_domain->dt_lock, flags);
return PTR_ERR(page_table);
}
- pte_addr = &page_table[rk_iova_pte_index(iova)];
- ret = rk_iommu_map_iova(rk_domain, pte_addr, iova, paddr, size, prot);
+ dte_index = rk_domain->dt[rk_iova_dte_index(iova)];
+ pte_index = rk_iova_pte_index(iova);
+ pte_addr = &page_table[pte_index];
+ pte_dma = rk_dte_pt_address(dte_index) + pte_index * sizeof(u32);
+ ret = rk_iommu_map_iova(rk_domain, pte_addr, pte_dma, iova,
+ paddr, size, prot);
+
spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
return ret;
{
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
unsigned long flags;
- dma_addr_t iova = (dma_addr_t)_iova;
+ dma_addr_t pte_dma, iova = (dma_addr_t)_iova;
phys_addr_t pt_phys;
u32 dte;
u32 *pte_addr;
pt_phys = rk_dte_pt_address(dte);
pte_addr = (u32 *)phys_to_virt(pt_phys) + rk_iova_pte_index(iova);
- unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, iova, size);
+ pte_dma = pt_phys + rk_iova_pte_index(iova) * sizeof(u32);
+ unmap_size = rk_iommu_unmap_iova(rk_domain, pte_addr, pte_dma, size);
spin_unlock_irqrestore(&rk_domain->dt_lock, flags);
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
unsigned long flags;
int ret, i;
- phys_addr_t dte_addr;
/*
* Allow 'virtual devices' (e.g., drm) to attach to domain.
iommu->domain = domain;
- ret = devm_request_irq(dev, iommu->irq, rk_iommu_irq,
+ ret = devm_request_irq(iommu->dev, iommu->irq, rk_iommu_irq,
IRQF_SHARED, dev_name(dev), iommu);
if (ret)
return ret;
- dte_addr = virt_to_phys(rk_domain->dt);
for (i = 0; i < iommu->num_mmu; i++) {
- rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, dte_addr);
+ rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
+ rk_domain->dt_dma);
rk_iommu_base_command(iommu->bases[i], RK_MMU_CMD_ZAP_CACHE);
rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, RK_MMU_IRQ_MASK);
}
}
rk_iommu_disable_stall(iommu);
- devm_free_irq(dev, iommu->irq, iommu);
+ devm_free_irq(iommu->dev, iommu->irq, iommu);
iommu->domain = NULL;
static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
{
struct rk_iommu_domain *rk_domain;
+ struct platform_device *pdev;
+ struct device *iommu_dev;
- if (type != IOMMU_DOMAIN_UNMANAGED)
+ if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
return NULL;
- rk_domain = kzalloc(sizeof(*rk_domain), GFP_KERNEL);
- if (!rk_domain)
+ /* Register a pdev per domain, so DMA API can base on this *dev
+ * even some virtual master doesn't have an iommu slave
+ */
+ pdev = platform_device_register_simple("rk_iommu_domain",
+ PLATFORM_DEVID_AUTO, NULL, 0);
+ if (IS_ERR(pdev))
return NULL;
+ rk_domain = devm_kzalloc(&pdev->dev, sizeof(*rk_domain), GFP_KERNEL);
+ if (!rk_domain)
+ goto err_unreg_pdev;
+
+ rk_domain->pdev = pdev;
+
+ if (type == IOMMU_DOMAIN_DMA &&
+ iommu_get_dma_cookie(&rk_domain->domain))
+ goto err_unreg_pdev;
+
/*
* rk32xx iommus use a 2 level pagetable.
* Each level1 (dt) and level2 (pt) table has 1024 4-byte entries.
*/
rk_domain->dt = (u32 *)get_zeroed_page(GFP_KERNEL | GFP_DMA32);
if (!rk_domain->dt)
- goto err_dt;
+ goto err_put_cookie;
+
+ iommu_dev = &pdev->dev;
+ rk_domain->dt_dma = dma_map_single(iommu_dev, rk_domain->dt,
+ SPAGE_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(iommu_dev, rk_domain->dt_dma)) {
+ dev_err(iommu_dev, "DMA map error for DT\n");
+ goto err_free_dt;
+ }
- rk_table_flush(rk_domain->dt, NUM_DT_ENTRIES);
+ rk_table_flush(rk_domain, rk_domain->dt_dma, NUM_DT_ENTRIES);
spin_lock_init(&rk_domain->iommus_lock);
spin_lock_init(&rk_domain->dt_lock);
INIT_LIST_HEAD(&rk_domain->iommus);
+ rk_domain->domain.geometry.aperture_start = 0;
+ rk_domain->domain.geometry.aperture_end = DMA_BIT_MASK(32);
+ rk_domain->domain.geometry.force_aperture = true;
+
return &rk_domain->domain;
-err_dt:
- kfree(rk_domain);
+err_free_dt:
+ free_page((unsigned long)rk_domain->dt);
+err_put_cookie:
+ if (type == IOMMU_DOMAIN_DMA)
+ iommu_put_dma_cookie(&rk_domain->domain);
+err_unreg_pdev:
+ platform_device_unregister(pdev);
+
return NULL;
}
if (rk_dte_is_pt_valid(dte)) {
phys_addr_t pt_phys = rk_dte_pt_address(dte);
u32 *page_table = phys_to_virt(pt_phys);
+ dma_unmap_single(&rk_domain->pdev->dev, pt_phys,
+ SPAGE_SIZE, DMA_TO_DEVICE);
free_page((unsigned long)page_table);
}
}
+ dma_unmap_single(&rk_domain->pdev->dev, rk_domain->dt_dma,
+ SPAGE_SIZE, DMA_TO_DEVICE);
free_page((unsigned long)rk_domain->dt);
- kfree(rk_domain);
+
+ if (domain->type == IOMMU_DOMAIN_DMA)
+ iommu_put_dma_cookie(&rk_domain->domain);
+
+ platform_device_unregister(rk_domain->pdev);
}
static bool rk_iommu_is_dev_iommu_master(struct device *dev)
.detach_dev = rk_iommu_detach_device,
.map = rk_iommu_map,
.unmap = rk_iommu_unmap,
+ .map_sg = default_iommu_map_sg,
.add_device = rk_iommu_add_device,
.remove_device = rk_iommu_remove_device,
.iova_to_phys = rk_iommu_iova_to_phys,
.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
};
+static int rk_iommu_domain_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
+ if (!dev->dma_parms)
+ return -ENOMEM;
+
+ /* Set dma_ops for dev, otherwise it would be dummy_dma_ops */
+ arch_setup_dma_ops(dev, 0, DMA_BIT_MASK(32), NULL, false);
+
+ dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
+ dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+
+ return 0;
+}
+
+static struct platform_driver rk_iommu_domain_driver = {
+ .probe = rk_iommu_domain_probe,
+ .driver = {
+ .name = "rk_iommu_domain",
+ },
+};
+
static int rk_iommu_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rk_iommu *iommu;
struct resource *res;
+ int num_res = pdev->num_resources;
int i;
iommu = devm_kzalloc(dev, sizeof(*iommu), GFP_KERNEL);
platform_set_drvdata(pdev, iommu);
iommu->dev = dev;
iommu->num_mmu = 0;
- iommu->bases = devm_kzalloc(dev, sizeof(*iommu->bases) * iommu->num_mmu,
+
+ iommu->bases = devm_kzalloc(dev, sizeof(*iommu->bases) * num_res,
GFP_KERNEL);
if (!iommu->bases)
return -ENOMEM;
- for (i = 0; i < pdev->num_resources; i++) {
+ for (i = 0; i < num_res; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
continue;
if (ret)
return ret;
- return platform_driver_register(&rk_iommu_driver);
+ ret = platform_driver_register(&rk_iommu_domain_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&rk_iommu_driver);
+ if (ret)
+ platform_driver_unregister(&rk_iommu_domain_driver);
+ return ret;
}
static void __exit rk_iommu_exit(void)
{
platform_driver_unregister(&rk_iommu_driver);
+ platform_driver_unregister(&rk_iommu_domain_driver);
}
subsys_initcall(rk_iommu_init);
projects / deliverable / linux.git / blobdiff