#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
};
struct rk_iommudata {
+ struct device_link *link; /* runtime PM link from IOMMU to master */
struct rk_iommu *iommu;
};
irqreturn_t ret = IRQ_NONE;
int i;
- WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
+ if (WARN_ON(!pm_runtime_get_if_in_use(iommu->dev)))
+ return 0;
+
+ if (WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks)))
+ goto out;
for (i = 0; i < iommu->num_mmu; i++) {
int_status = rk_iommu_read(iommu->bases[i], RK_MMU_INT_STATUS);
clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+out:
+ pm_runtime_put(iommu->dev);
return ret;
}
spin_lock_irqsave(&rk_domain->iommus_lock, flags);
list_for_each(pos, &rk_domain->iommus) {
struct rk_iommu *iommu;
+
iommu = list_entry(pos, struct rk_iommu, node);
- WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
- rk_iommu_zap_lines(iommu, iova, size);
- clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+
+ /* Only zap TLBs of IOMMUs that are powered on. */
+ if (pm_runtime_get_if_in_use(iommu->dev)) {
+ WARN_ON(clk_bulk_enable(iommu->num_clocks,
+ iommu->clocks));
+ rk_iommu_zap_lines(iommu, iova, size);
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+ pm_runtime_put(iommu->dev);
+ }
}
spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
}
return data ? data->iommu : NULL;
}
-static int rk_iommu_attach_device(struct iommu_domain *domain,
- struct device *dev)
+/* Must be called with iommu powered on and attached */
+static void rk_iommu_disable(struct rk_iommu *iommu)
{
- struct rk_iommu *iommu;
+ int i;
+
+ /* Ignore error while disabling, just keep going */
+ WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
+ rk_iommu_enable_stall(iommu);
+ rk_iommu_disable_paging(iommu);
+ for (i = 0; i < iommu->num_mmu; i++) {
+ rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, 0);
+ rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0);
+ }
+ rk_iommu_disable_stall(iommu);
+ clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+}
+
+/* Must be called with iommu powered on and attached */
+static int rk_iommu_enable(struct rk_iommu *iommu)
+{
+ struct iommu_domain *domain = iommu->domain;
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
- unsigned long flags;
int ret, i;
- /*
- * Allow 'virtual devices' (e.g., drm) to attach to domain.
- * Such a device does not belong to an iommu group.
- */
- iommu = rk_iommu_from_dev(dev);
- if (!iommu)
- return 0;
-
ret = clk_bulk_enable(iommu->num_clocks, iommu->clocks);
if (ret)
return ret;
if (ret)
goto out_disable_stall;
- iommu->domain = domain;
-
for (i = 0; i < iommu->num_mmu; i++) {
rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR,
rk_domain->dt_dma);
}
ret = rk_iommu_enable_paging(iommu);
- if (ret)
- goto out_disable_stall;
-
- spin_lock_irqsave(&rk_domain->iommus_lock, flags);
- list_add_tail(&iommu->node, &rk_domain->iommus);
- spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
-
- dev_dbg(dev, "Attached to iommu domain\n");
out_disable_stall:
rk_iommu_disable_stall(iommu);
struct rk_iommu *iommu;
struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
unsigned long flags;
- int i;
/* Allow 'virtual devices' (eg drm) to detach from domain */
iommu = rk_iommu_from_dev(dev);
if (!iommu)
return;
+ dev_dbg(dev, "Detaching from iommu domain\n");
+
+ /* iommu already detached */
+ if (iommu->domain != domain)
+ return;
+
+ iommu->domain = NULL;
+
spin_lock_irqsave(&rk_domain->iommus_lock, flags);
list_del_init(&iommu->node);
spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
- /* Ignore error while disabling, just keep going */
- WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks));
- rk_iommu_enable_stall(iommu);
- rk_iommu_disable_paging(iommu);
- for (i = 0; i < iommu->num_mmu; i++) {
- rk_iommu_write(iommu->bases[i], RK_MMU_INT_MASK, 0);
- rk_iommu_write(iommu->bases[i], RK_MMU_DTE_ADDR, 0);
+ if (pm_runtime_get_if_in_use(iommu->dev)) {
+ rk_iommu_disable(iommu);
+ pm_runtime_put(iommu->dev);
}
- rk_iommu_disable_stall(iommu);
- clk_bulk_disable(iommu->num_clocks, iommu->clocks);
+}
- iommu->domain = NULL;
+static int rk_iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct rk_iommu *iommu;
+ struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
+ unsigned long flags;
+ int ret;
- dev_dbg(dev, "Detached from iommu domain\n");
+ /*
+ * Allow 'virtual devices' (e.g., drm) to attach to domain.
+ * Such a device does not belong to an iommu group.
+ */
+ iommu = rk_iommu_from_dev(dev);
+ if (!iommu)
+ return 0;
+
+ dev_dbg(dev, "Attaching to iommu domain\n");
+
+ /* iommu already attached */
+ if (iommu->domain == domain)
+ return 0;
+
+ if (iommu->domain)
+ rk_iommu_detach_device(iommu->domain, dev);
+
+ iommu->domain = domain;
+
+ spin_lock_irqsave(&rk_domain->iommus_lock, flags);
+ list_add_tail(&iommu->node, &rk_domain->iommus);
+ spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
+
+ if (!pm_runtime_get_if_in_use(iommu->dev))
+ return 0;
+
+ ret = rk_iommu_enable(iommu);
+ if (ret)
+ rk_iommu_detach_device(iommu->domain, dev);
+
+ pm_runtime_put(iommu->dev);
+
+ return ret;
}
static struct iommu_domain *rk_iommu_domain_alloc(unsigned type)
{
struct iommu_group *group;
struct rk_iommu *iommu;
+ struct rk_iommudata *data;
- iommu = rk_iommu_from_dev(dev);
- if (!iommu)
+ data = dev->archdata.iommu;
+ if (!data)
return -ENODEV;
+ iommu = rk_iommu_from_dev(dev);
+
group = iommu_group_get_for_dev(dev);
if (IS_ERR(group))
return PTR_ERR(group);
iommu_group_put(group);
iommu_device_link(&iommu->iommu, dev);
+ data->link = device_link_add(dev, iommu->dev, DL_FLAG_PM_RUNTIME);
return 0;
}
static void rk_iommu_remove_device(struct device *dev)
{
struct rk_iommu *iommu;
+ struct rk_iommudata *data = dev->archdata.iommu;
iommu = rk_iommu_from_dev(dev);
+ device_link_del(data->link);
iommu_device_unlink(&iommu->iommu, dev);
iommu_group_remove_device(dev);
}
bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
+ pm_runtime_enable(dev);
+
return 0;
err_remove_sysfs:
iommu_device_sysfs_remove(&iommu->iommu);
static void rk_iommu_shutdown(struct platform_device *pdev)
{
- struct rk_iommu *iommu = platform_get_drvdata(pdev);
+ pm_runtime_force_suspend(&pdev->dev);
+}
- /*
- * Be careful not to try to shutdown an otherwise unused
- * IOMMU, as it is likely not to be clocked, and accessing it
- * would just block. An IOMMU without a domain is likely to be
- * unused, so let's use this as a (weak) guard.
- */
- if (iommu && iommu->domain) {
- rk_iommu_enable_stall(iommu);
- rk_iommu_disable_paging(iommu);
- rk_iommu_force_reset(iommu);
- }
+static int __maybe_unused rk_iommu_suspend(struct device *dev)
+{
+ struct rk_iommu *iommu = dev_get_drvdata(dev);
+
+ if (!iommu->domain)
+ return 0;
+
+ rk_iommu_disable(iommu);
+ return 0;
+}
+
+static int __maybe_unused rk_iommu_resume(struct device *dev)
+{
+ struct rk_iommu *iommu = dev_get_drvdata(dev);
+
+ if (!iommu->domain)
+ return 0;
+
+ return rk_iommu_enable(iommu);
}
+static const struct dev_pm_ops rk_iommu_pm_ops = {
+ SET_RUNTIME_PM_OPS(rk_iommu_suspend, rk_iommu_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
static const struct of_device_id rk_iommu_dt_ids[] = {
{ .compatible = "rockchip,iommu" },
{ /* sentinel */ }
.driver = {
.name = "rk_iommu",
.of_match_table = rk_iommu_dt_ids,
+ .pm = &rk_iommu_pm_ops,
.suppress_bind_attrs = true,
},
};