[PATCH v3 04/11] staging: fsl-mc: Added GICv3-ITS support for FSL-MC MSIs

[J. German Rivera]

Added platform-specific MSI support layer for FSL-MC devices.

Signed-off-by: J. German Rivera 
---
CHANGE HISTORY

Changes in v3: none

Changes in v2: none

 drivers/staging/fsl-mc/bus/Makefile|   1 +
 .../staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c | 127 +
 drivers/staging/fsl-mc/include/mc-private.h|   4 +
 3 files changed, 132 insertions(+)
 create mode 100644 drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

diff --git a/drivers/staging/fsl-mc/bus/Makefile 
b/drivers/staging/fsl-mc/bus/Makefile
index a5f2ba4..e731517 100644
--- a/drivers/staging/fsl-mc/bus/Makefile
+++ b/drivers/staging/fsl-mc/bus/Makefile
@@ -14,5 +14,6 @@ mc-bus-driver-objs := mc-bus.o \
  dprc-driver.o \
  mc-allocator.o \
  mc-msi.o \
+ irq-gic-v3-its-fsl-mc-msi.o \
  dpmcp.o \
  dpbp.o
diff --git a/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c 
b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
new file mode 100644
index 000..5319afa
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
@@ -0,0 +1,127 @@
+/*
+ * Freescale Management Complex (MC) bus driver MSI support
+ *
+ * Copyright (C) 2015 Freescale Semiconductor, Inc.
+ * Author: German Rivera 
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include "../include/mc-private.h"
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include "../include/mc-sys.h"
+#include "dprc-cmd.h"
+
+static struct irq_chip its_msi_irq_chip = {
+   .name = "fsl-mc-bus-msi",
+   .irq_mask = irq_chip_mask_parent,
+   .irq_unmask = irq_chip_unmask_parent,
+   .irq_eoi = irq_chip_eoi_parent,
+   .irq_set_affinity = msi_domain_set_affinity
+};
+
+static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
+ struct device *dev,
+ int nvec, msi_alloc_info_t *info)
+{
+   u32 its_dev_id;
+   struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(dev);
+   struct msi_domain_info *msi_info;
+
+   if (WARN_ON(dev->bus != _mc_bus_type))
+   return -EINVAL;
+
+   if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
+   return -EINVAL;
+
+   /*
+* Set the device Id to be passed to the GIC-ITS:
+*
+* NOTE: This device id corresponds to the IOMMU stream ID
+* associated with the DPRC object (ICID).
+*/
+   its_dev_id = mc_bus_dev->icid;
+   info->scratchpad[0].ul = its_dev_id;
+   msi_info = msi_get_domain_info(msi_domain->parent);
+   return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
+}
+
+static struct msi_domain_ops its_fsl_mc_msi_ops = {
+   .msi_prepare = its_fsl_mc_msi_prepare,
+};
+
+static struct msi_domain_info its_fsl_mc_msi_domain_info = {
+   .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
+   .ops= _fsl_mc_msi_ops,
+   .chip   = _msi_irq_chip,
+};
+
+static const struct of_device_id its_device_id[] = {
+   {   .compatible = "arm,gic-v3-its", },
+   {},
+};
+
+int __init its_fsl_mc_msi_init(void)
+{
+   struct device_node *np;
+   struct irq_domain *parent;
+   struct irq_domain *mc_msi_domain;
+
+   for (np = of_find_matching_node(NULL, its_device_id); np;
+np = of_find_matching_node(np, its_device_id)) {
+   if (!of_property_read_bool(np, "msi-controller"))
+   continue;
+
+   parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
+   if (!parent || !msi_get_domain_info(parent)) {
+   pr_err("%s: unable to locate ITS domain\n",
+  np->full_name);
+   continue;
+   }
+
+   mc_msi_domain =
+   fsl_mc_msi_create_irq_domain(of_node_to_fwnode(np),
+_fsl_mc_msi_domain_info,
+parent);
+   if (!mc_msi_domain) {
+   pr_err("%s: unable to create fsl-mc domain\n",
+  np->full_name);
+   continue;
+   }
+
+   WARN_ON(mc_msi_domain->host_data !=
+   _fsl_mc_msi_domain_info);
+
+   pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
+   }
+
+   return 0;
+}
+
+void its_fsl_mc_msi_cleanup(void)
+{
+   struct device_node *np;
+
+   for (np = of_find_matching_node(NULL, its_device_id); np;
+np = of_find_matching_node(np, its_device_id)) {
+   struct irq_domain *mc_msi_domain =
+  

[PATCH v3 04/11] staging: fsl-mc: Added GICv3-ITS support for FSL-MC MSIs

[J. German Rivera]

Added platform-specific MSI support layer for FSL-MC devices.

Signed-off-by: J. German Rivera 
---
CHANGE HISTORY

Changes in v3: none

Changes in v2: none

 drivers/staging/fsl-mc/bus/Makefile|   1 +
 .../staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c | 127 +
 drivers/staging/fsl-mc/include/mc-private.h|   4 +
 3 files changed, 132 insertions(+)
 create mode 100644 drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

diff --git a/drivers/staging/fsl-mc/bus/Makefile 
b/drivers/staging/fsl-mc/bus/Makefile
index a5f2ba4..e731517 100644
--- a/drivers/staging/fsl-mc/bus/Makefile
+++ b/drivers/staging/fsl-mc/bus/Makefile
@@ -14,5 +14,6 @@ mc-bus-driver-objs := mc-bus.o \
  dprc-driver.o \
  mc-allocator.o \
  mc-msi.o \
+ irq-gic-v3-its-fsl-mc-msi.o \
  dpmcp.o \
  dpbp.o
diff --git a/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c 
b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
new file mode 100644
index 000..5319afa
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
@@ -0,0 +1,127 @@
+/*
+ * Freescale Management Complex (MC) bus driver MSI support
+ *
+ * Copyright (C) 2015 Freescale Semiconductor, Inc.
+ * Author: German Rivera 
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include "../include/mc-private.h"
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include 
+#include "../include/mc-sys.h"
+#include "dprc-cmd.h"
+
+static struct irq_chip its_msi_irq_chip = {
+   .name = "fsl-mc-bus-msi",
+   .irq_mask = irq_chip_mask_parent,
+   .irq_unmask = irq_chip_unmask_parent,
+   .irq_eoi = irq_chip_eoi_parent,
+   .irq_set_affinity = msi_domain_set_affinity
+};
+
+static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
+ struct device *dev,
+ int nvec, msi_alloc_info_t *info)
+{
+   u32 its_dev_id;
+   struct fsl_mc_device *mc_bus_dev = to_fsl_mc_device(dev);
+   struct msi_domain_info *msi_info;
+
+   if (WARN_ON(dev->bus != _mc_bus_type))
+   return -EINVAL;
+
+   if (WARN_ON(!(mc_bus_dev->flags & FSL_MC_IS_DPRC)))
+   return -EINVAL;
+
+   /*
+* Set the device Id to be passed to the GIC-ITS:
+*
+* NOTE: This device id corresponds to the IOMMU stream ID
+* associated with the DPRC object (ICID).
+*/
+   its_dev_id = mc_bus_dev->icid;
+   info->scratchpad[0].ul = its_dev_id;
+   msi_info = msi_get_domain_info(msi_domain->parent);
+   return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
+}
+
+static struct msi_domain_ops its_fsl_mc_msi_ops = {
+   .msi_prepare = its_fsl_mc_msi_prepare,
+};
+
+static struct msi_domain_info its_fsl_mc_msi_domain_info = {
+   .flags  = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
+   .ops= _fsl_mc_msi_ops,
+   .chip   = _msi_irq_chip,
+};
+
+static const struct of_device_id its_device_id[] = {
+   {   .compatible = "arm,gic-v3-its", },
+   {},
+};
+
+int __init its_fsl_mc_msi_init(void)
+{
+   struct device_node *np;
+   struct irq_domain *parent;
+   struct irq_domain *mc_msi_domain;
+
+   for (np = of_find_matching_node(NULL, its_device_id); np;
+np = of_find_matching_node(np, its_device_id)) {
+   if (!of_property_read_bool(np, "msi-controller"))
+   continue;
+
+   parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
+   if (!parent || !msi_get_domain_info(parent)) {
+   pr_err("%s: unable to locate ITS domain\n",
+  np->full_name);
+   continue;
+   }
+
+   mc_msi_domain =
+   fsl_mc_msi_create_irq_domain(of_node_to_fwnode(np),
+_fsl_mc_msi_domain_info,
+parent);
+   if (!mc_msi_domain) {
+   pr_err("%s: unable to create fsl-mc domain\n",
+  np->full_name);
+   continue;
+   }
+
+   WARN_ON(mc_msi_domain->host_data !=
+   _fsl_mc_msi_domain_info);
+
+   pr_info("fsl-mc MSI: %s domain created\n", np->full_name);
+   }
+
+   return 0;
+}
+
+void its_fsl_mc_msi_cleanup(void)
+{
+   struct device_node *np;
+
+   for (np = of_find_matching_node(NULL, its_device_id); np;
+np = of_find_matching_node(np, its_device_id)) {
+