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path: root/drivers/iommu/omap-iommu.c
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Diffstat (limited to 'drivers/iommu/omap-iommu.c')
-rw-r--r--drivers/iommu/omap-iommu.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 36d0033c2ccb..3dc5b65f3990 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -26,6 +26,8 @@
#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 <asm/cacheflush.h>
@@ -112,6 +114,18 @@ void omap_iommu_restore_ctx(struct device *dev)
}
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);
@@ -147,6 +161,8 @@ static int omap2_iommu_enable(struct omap_iommu *obj)
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);
@@ -161,6 +177,7 @@ static void omap2_iommu_disable(struct omap_iommu *obj)
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);
}
@@ -864,6 +881,42 @@ static void omap_iommu_detach(struct omap_iommu *obj)
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
}
+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
*/
@@ -907,6 +960,10 @@ static int omap_iommu_probe(struct platform_device *pdev)
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;
@@ -943,6 +1000,7 @@ 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" },
{},
};