From: Magnus Damm <damm+rene...@opensource.se>
Tie in r8a7795 features and update the IOMMU_OF_DECLARE
compat string to include the updated compat string.
TODO:
- Consider making use of iommu_fwspec_add_ids() for uTLB handling
Needed to coexist with non-OF R-Car Gen2 somehow...
- Break out stuff useful for R-Car Gen2 from this series
Fix up the Gen2 IPMMU support code
and/or
Fold more stuff into the multi-arch series
- Add support for sysfs and iommu_device_link()/unlink()
Signed-off-by: Magnus Damm <damm+rene...@opensource.se>
---
Changes since V2:
- Check for lack of root device in ->xlate()
This fixed a bug when IPMMU-MM is disabled in DT the system hangs on boot
- Added code to ipmmu_init_platform_device() to handle multiple ->xlate() calls
- Include empty white list by default
- Updated TODO list
Changes since V1:
- Enable multi context feature
- Update TODO list
drivers/iommu/ipmmu-vmsa.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
--- 0018/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2017-03-08 19:11:53.600607110 +0900
@@ -23,6 +23,7 @@
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
+#include <linux/sys_soc.h>
#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
#include <asm/dma-iommu.h>
@@ -770,6 +771,10 @@ static int ipmmu_init_platform_device(st
int num_utlbs;
int ret = -ENODEV;
+ /* Initialize once - xlate() will call multiple times */
+ if (to_archdata(dev))
+ return 0;
+
/* Find the master corresponding to the device. */
num_utlbs = of_count_phandle_with_args(dev->of_node, "iommus",
@@ -1043,6 +1048,17 @@ static struct iommu_group *ipmmu_find_gr
return group;
}
+static bool ipmmu_slave_whitelist(struct device *dev)
+{
+ /* By default, do not allow use of IPMMU */
+ return false;
+}
+
+static const struct soc_device_attribute soc_r8a7795[] = {
+ { .soc_id = "r8a7795", },
+ { /* sentinel */ }
+};
+
static int ipmmu_of_xlate_dma(struct device *dev,
struct of_phandle_args *spec)
{
@@ -1053,6 +1069,18 @@ static int ipmmu_of_xlate_dma(struct dev
if (!of_device_is_available(spec->np))
return -ENODEV;
+ /* Failing in ->attach_device() results in a hang, so make
+ * sure the root device is installed before going there
+ */
+ if (!__ipmmu_find_root()) {
+ dev_info(dev, "Unable to locate IPMMU root device\n");
+ return -ENODEV;
+ }
+
+ /* For R-Car Gen3 use a white list to opt-in slave devices */
+ if (soc_device_match(soc_r8a7795) && !ipmmu_slave_whitelist(dev))
+ return -ENODEV;
+
return ipmmu_init_platform_device(dev);
}
@@ -1095,11 +1123,22 @@ static const struct ipmmu_features ipmmu
.twobit_imttbcr_sl0 = false,
};
+static const struct ipmmu_features ipmmu_features_r8a7795 = {
+ .use_ns_alias_offset = false,
+ .has_cache_leaf_nodes = true,
+ .has_eight_ctx = true,
+ .setup_imbuscr = false,
+ .twobit_imttbcr_sl0 = true,
+};
+
static const struct of_device_id ipmmu_of_ids[] = {
{
.compatible = "renesas,ipmmu-vmsa",
.data = &ipmmu_features_default,
}, {
+ .compatible = "renesas,ipmmu-r8a7795",
+ .data = &ipmmu_features_r8a7795,
+ }, {
/* Terminator */
},
};
@@ -1288,6 +1327,8 @@ static int __init ipmmu_vmsa_iommu_of_se
IOMMU_OF_DECLARE(ipmmu_vmsa_iommu_of, "renesas,ipmmu-vmsa",
ipmmu_vmsa_iommu_of_setup);
+IOMMU_OF_DECLARE(ipmmu_r8a7795_iommu_of, "renesas,ipmmu-r8a7795",
+ ipmmu_vmsa_iommu_of_setup);
#endif
MODULE_DESCRIPTION("IOMMU API for Renesas VMSA-compatible IPMMU");
