diff options
author | Arnd Bergmann <arnd@arndb.de> | 2014-12-05 17:45:38 +0100 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2014-12-05 17:45:38 +0100 |
commit | fd522d279235b8bcafc39c1040895fe2d938d1e7 (patch) | |
tree | e6f54fe900945b7c1939757a59aeabc510605a27 /drivers/iommu | |
parent | 5d01410fe4d92081f349b013a2e7a95429e4f2c9 (diff) | |
parent | a42a7a1fb5f1f9004b023594609dc22da02fc08b (diff) |
Merge tag 'of-iommu-configure' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/iommu-config
Pull "Automatic DMA configuration for OF-based IOMMU masters" from Will Deacon:
This series adds automatic IOMMU and DMA-mapping configuration for
OF-based DMA masters described using the generic IOMMU devicetree
bindings. Although there is plenty of future work around splitting up
iommu_ops, adding default IOMMU domains and sorting out automatic IOMMU
group creation for the platform_bus, this is already useful enough for
people to port over their IOMMU drivers and start using the new probing
infrastructure (indeed, Marek has patches queued for the Exynos IOMMU).
* tag 'of-iommu-configure' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
iommu: store DT-probed IOMMU data privately
arm: dma-mapping: plumb our iommu mapping ops into arch_setup_dma_ops
arm: call iommu_init before of_platform_populate
dma-mapping: detect and configure IOMMU in of_dma_configure
iommu: fix initialization without 'add_device' callback
iommu: provide helper function to configure an IOMMU for an of master
iommu: add new iommu_ops callback for adding an OF device
dma-mapping: replace set_arch_dma_coherent_ops with arch_setup_dma_ops
iommu: provide early initialisation hook for IOMMU drivers
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/Kconfig | 2 | ||||
-rw-r--r-- | drivers/iommu/iommu.c | 2 | ||||
-rw-r--r-- | drivers/iommu/of_iommu.c | 89 |
3 files changed, 91 insertions, 2 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index dd5112265cc9..6d13f962f156 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -15,7 +15,7 @@ if IOMMU_SUPPORT config OF_IOMMU def_bool y - depends on OF + depends on OF && IOMMU_API config FSL_PAMU bool "Freescale IOMMU support" diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index ed8b04867b1f..02f798b7e295 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -737,7 +737,7 @@ static int add_iommu_group(struct device *dev, void *data) const struct iommu_ops *ops = cb->ops; if (!ops->add_device) - return -ENODEV; + return 0; WARN_ON(dev->iommu_group); diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index e550ccb7634e..af1dc6a1c0a1 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -18,9 +18,14 @@ */ #include <linux/export.h> +#include <linux/iommu.h> #include <linux/limits.h> #include <linux/of.h> #include <linux/of_iommu.h> +#include <linux/slab.h> + +static const struct of_device_id __iommu_of_table_sentinel + __used __section(__iommu_of_table_end); /** * of_get_dma_window - Parse *dma-window property and returns 0 if found. @@ -89,3 +94,87 @@ int of_get_dma_window(struct device_node *dn, const char *prefix, int index, return 0; } EXPORT_SYMBOL_GPL(of_get_dma_window); + +struct of_iommu_node { + struct list_head list; + struct device_node *np; + struct iommu_ops *ops; +}; +static LIST_HEAD(of_iommu_list); +static DEFINE_SPINLOCK(of_iommu_lock); + +void of_iommu_set_ops(struct device_node *np, struct iommu_ops *ops) +{ + struct of_iommu_node *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); + + if (WARN_ON(!iommu)) + return; + + INIT_LIST_HEAD(&iommu->list); + iommu->np = np; + iommu->ops = ops; + spin_lock(&of_iommu_lock); + list_add_tail(&iommu->list, &of_iommu_list); + spin_unlock(&of_iommu_lock); +} + +struct iommu_ops *of_iommu_get_ops(struct device_node *np) +{ + struct of_iommu_node *node; + struct iommu_ops *ops = NULL; + + spin_lock(&of_iommu_lock); + list_for_each_entry(node, &of_iommu_list, list) + if (node->np == np) { + ops = node->ops; + break; + } + spin_unlock(&of_iommu_lock); + return ops; +} + +struct iommu_ops *of_iommu_configure(struct device *dev) +{ + struct of_phandle_args iommu_spec; + struct device_node *np; + struct iommu_ops *ops = NULL; + int idx = 0; + + /* + * We don't currently walk up the tree looking for a parent IOMMU. + * See the `Notes:' section of + * Documentation/devicetree/bindings/iommu/iommu.txt + */ + while (!of_parse_phandle_with_args(dev->of_node, "iommus", + "#iommu-cells", idx, + &iommu_spec)) { + np = iommu_spec.np; + ops = of_iommu_get_ops(np); + + if (!ops || !ops->of_xlate || ops->of_xlate(dev, &iommu_spec)) + goto err_put_node; + + of_node_put(np); + idx++; + } + + return ops; + +err_put_node: + of_node_put(np); + return NULL; +} + +void __init of_iommu_init(void) +{ + struct device_node *np; + const struct of_device_id *match, *matches = &__iommu_of_table; + + for_each_matching_node_and_match(np, matches, &match) { + const of_iommu_init_fn init_fn = match->data; + + if (init_fn(np)) + pr_err("Failed to initialise IOMMU %s\n", + of_node_full_name(np)); + } +} |