diff options
| -rw-r--r-- | drivers/iommu/omap-iommu.c | 139 |
1 files changed, 99 insertions, 40 deletions
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 84b99d5841ae..fbceae3c2ee7 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -186,53 +186,18 @@ static void omap2_iommu_disable(struct omap_iommu *obj) static int iommu_enable(struct omap_iommu *obj) { - int err; - struct platform_device *pdev = to_platform_device(obj->dev); - struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev); - - if (pdata && pdata->set_pwrdm_constraint) { - err = pdata->set_pwrdm_constraint(pdev, true, &obj->pwrst); - if (err) { - dev_warn(obj->dev, "pwrdm_constraint failed to be set, status = %d\n", - err); - } - } - - if (pdata && pdata->deassert_reset) { - err = pdata->deassert_reset(pdev, pdata->reset_name); - if (err) { - dev_err(obj->dev, "deassert_reset failed: %d\n", err); - return err; - } - } - - pm_runtime_get_sync(obj->dev); + int ret; - err = omap2_iommu_enable(obj); + ret = pm_runtime_get_sync(obj->dev); + if (ret < 0) + pm_runtime_put_noidle(obj->dev); - return err; + return ret < 0 ? ret : 0; } static void iommu_disable(struct omap_iommu *obj) { - struct platform_device *pdev = to_platform_device(obj->dev); - struct iommu_platform_data *pdata = dev_get_platdata(&pdev->dev); - int ret; - - omap2_iommu_disable(obj); - pm_runtime_put_sync(obj->dev); - - 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); - } - } } /* @@ -927,6 +892,85 @@ static void omap_iommu_detach(struct omap_iommu *obj) dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name); } +/** + * 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. + **/ +static 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; + + 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. + **/ +static 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); + + ret = omap2_iommu_enable(obj); + + return ret; +} + static bool omap_iommu_can_register(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -1001,6 +1045,15 @@ static int omap_iommu_probe(struct platform_device *pdev) 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); @@ -1089,6 +1142,11 @@ static int omap_iommu_remove(struct platform_device *pdev) return 0; } +static const struct dev_pm_ops omap_iommu_pm_ops = { + 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" }, @@ -1102,6 +1160,7 @@ static struct platform_driver omap_iommu_driver = { .remove = omap_iommu_remove, .driver = { .name = "omap-iommu", + .pm = &omap_iommu_pm_ops, .of_match_table = of_match_ptr(omap_iommu_of_match), }, }; |