[PATCH v3 12/17] xen/arm: Add support for Xilinx ZynqMP PCI host controller

[Rahul Singh <rahul.singh@arm.com>]

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

Add support for Xilinx ZynqMP PCI host controller to map the PCI config
space to the XEN memory.

Patch helps to understand how the generic infrastructure for PCI
host-bridge discovery will be used for future references.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
Change in v3:
- nwl_cfg_reg_index(..) as static function
- Add support for pci_host_generic_probe() 
Change in v2:
- Add more info in commit msg
---
 xen/arch/arm/pci/Makefile          |  1 +
 xen/arch/arm/pci/pci-host-zynqmp.c | 63 ++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 xen/arch/arm/pci/pci-host-zynqmp.c

diff --git a/xen/arch/arm/pci/Makefile b/xen/arch/arm/pci/Makefile
index 6f32fbbe67..1d045ade01 100644
--- a/xen/arch/arm/pci/Makefile
+++ b/xen/arch/arm/pci/Makefile
@@ -3,3 +3,4 @@ obj-y += pci-access.o
 obj-y += pci-host-generic.o
 obj-y += pci-host-common.o
 obj-y += ecam.o
+obj-y += pci-host-zynqmp.o
diff --git a/xen/arch/arm/pci/pci-host-zynqmp.c b/xen/arch/arm/pci/pci-host-zynqmp.c
new file mode 100644
index 0000000000..6ccbfd15c9
--- /dev/null
+++ b/xen/arch/arm/pci/pci-host-zynqmp.c
@@ -0,0 +1,63 @@
+/*
+ * Based on Linux drivers/pci/controller/pci-host-common.c
+ * Based on Linux drivers/pci/controller/pci-host-generic.c
+ * Based on xen/arch/arm/pci/pci-host-generic.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <asm/device.h>
+#include <xen/pci.h>
+#include <asm/pci.h>
+
+static int nwl_cfg_reg_index(struct dt_device_node *np)
+{
+    return dt_property_match_string(np, "reg-names", "cfg");
+}
+
+/* ECAM ops */
+const struct pci_ecam_ops nwl_pcie_ops = {
+    .bus_shift  = 20,
+    .cfg_reg_index = nwl_cfg_reg_index,
+    .pci_ops    = {
+        .map_bus                = pci_ecam_map_bus,
+        .read                   = pci_generic_config_read,
+        .write                  = pci_generic_config_write,
+    }
+};
+
+static const struct dt_device_match nwl_pcie_dt_match[] = {
+    { .compatible = "xlnx,nwl-pcie-2.11" },
+    { },
+};
+
+static int pci_host_generic_probe(struct dt_device_node *dev,
+                                  const void *data)
+{
+    return pci_host_common_probe(dev, &nwl_pcie_ops);
+}
+
+DT_DEVICE_START(pci_gen, "PCI HOST ZYNQMP", DEVICE_PCI)
+.dt_match = nwl_pcie_dt_match,
+.init = pci_host_generic_probe,
+DT_DEVICE_END
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.17.1