diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/iommu/mtk_iommu.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 6875ca1225f0..8fc17158bc28 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -8,6 +8,7 @@ #include <linux/clk.h> #include <linux/component.h> #include <linux/device.h> +#include <linux/dma-direct.h> #include <linux/dma-iommu.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -314,6 +315,36 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) return IRQ_HANDLED; } +static int mtk_iommu_get_domain_id(struct device *dev, + const struct mtk_iommu_plat_data *plat_data) +{ + const struct mtk_iommu_iova_region *rgn = plat_data->iova_region; + const struct bus_dma_region *dma_rgn = dev->dma_range_map; + int i, candidate = -1; + dma_addr_t dma_end; + + if (!dma_rgn || plat_data->iova_region_nr == 1) + return 0; + + dma_end = dma_rgn->dma_start + dma_rgn->size - 1; + for (i = 0; i < plat_data->iova_region_nr; i++, rgn++) { + /* Best fit. */ + if (dma_rgn->dma_start == rgn->iova_base && + dma_end == rgn->iova_base + rgn->size - 1) + return i; + /* ok if it is inside this region. */ + if (dma_rgn->dma_start >= rgn->iova_base && + dma_end < rgn->iova_base + rgn->size) + candidate = i; + } + + if (candidate >= 0) + return candidate; + dev_err(dev, "Can NOT find the iommu domain id(%pad 0x%llx).\n", + &dma_rgn->dma_start, dma_rgn->size); + return -EINVAL; +} + static void mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev, bool enable) { @@ -400,11 +431,15 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain, struct mtk_iommu_data *data = dev_iommu_priv_get(dev); struct mtk_iommu_domain *dom = to_mtk_domain(domain); struct device *m4udev = data->dev; - int ret; + int ret, domid; if (!data) return -ENODEV; + domid = mtk_iommu_get_domain_id(dev, data->plat_data); + if (domid < 0) + return domid; + if (!dom->data) { if (mtk_iommu_domain_finalise(dom, data)) return -ENODEV; @@ -534,10 +569,15 @@ static void mtk_iommu_release_device(struct device *dev) static struct iommu_group *mtk_iommu_device_group(struct device *dev) { struct mtk_iommu_data *data = mtk_iommu_get_m4u_data(); + int domid; if (!data) return ERR_PTR(-ENODEV); + domid = mtk_iommu_get_domain_id(dev, data->plat_data); + if (domid < 0) + return ERR_PTR(domid); + /* All the client devices are in the same m4u iommu-group */ if (!data->m4u_group) { data->m4u_group = iommu_group_alloc(); |