bus: mvebu-mbus: Add new API for the PCIe memory and IO aperture

We add two optional properties to the MBus DT binding, to encode
the PCIe memory and IO aperture. This allows such information to
be retrieved by -for instance- the pci driver to allocate the
MBus decoding windows.

Correspondingly, and in order to retrieve this information,
we add two new APIs.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 78b8c04..929fed1 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -142,6 +142,8 @@
 	struct dentry *debugfs_root;
 	struct dentry *debugfs_sdram;
 	struct dentry *debugfs_devs;
+	struct resource pcie_mem_aperture;
+	struct resource pcie_io_aperture;
 	const struct mvebu_mbus_soc_data *soc;
 	int hw_io_coherency;
 };
@@ -821,6 +823,20 @@
 	return 0;
 }
 
+void mvebu_mbus_get_pcie_mem_aperture(struct resource *res)
+{
+	if (!res)
+		return;
+	*res = mbus_state.pcie_mem_aperture;
+}
+
+void mvebu_mbus_get_pcie_io_aperture(struct resource *res)
+{
+	if (!res)
+		return;
+	*res = mbus_state.pcie_io_aperture;
+}
+
 static __init int mvebu_mbus_debugfs_init(void)
 {
 	struct mvebu_mbus_state *s = &mbus_state;
@@ -1023,6 +1039,35 @@
 	return 0;
 }
 
+static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
+						 struct resource *mem,
+						 struct resource *io)
+{
+	u32 reg[2];
+	int ret;
+
+	/*
+	 * These are optional, so we clear them and they'll
+	 * be zero if they are missing from the DT.
+	 */
+	memset(mem, 0, sizeof(struct resource));
+	memset(io, 0, sizeof(struct resource));
+
+	ret = of_property_read_u32_array(np, "pcie-mem-aperture", reg, ARRAY_SIZE(reg));
+	if (!ret) {
+		mem->start = reg[0];
+		mem->end = mem->start + reg[1];
+		mem->flags = IORESOURCE_MEM;
+	}
+
+	ret = of_property_read_u32_array(np, "pcie-io-aperture", reg, ARRAY_SIZE(reg));
+	if (!ret) {
+		io->start = reg[0];
+		io->end = io->start + reg[1];
+		io->flags = IORESOURCE_IO;
+	}
+}
+
 int __init mvebu_mbus_dt_init(void)
 {
 	struct resource mbuswins_res, sdramwins_res;
@@ -1062,6 +1107,10 @@
 		return -EINVAL;
 	}
 
+	/* Get optional pcie-{mem,io}-aperture properties */
+	mvebu_mbus_get_pcie_resources(np, &mbus_state.pcie_mem_aperture,
+					  &mbus_state.pcie_io_aperture);
+
 	ret = mvebu_mbus_common_init(&mbus_state,
 				     mbuswins_res.start,
 				     resource_size(&mbuswins_res),
diff --git a/include/linux/mbus.h b/include/linux/mbus.h
index eadefd6..650bc15 100644
--- a/include/linux/mbus.h
+++ b/include/linux/mbus.h
@@ -11,6 +11,8 @@
 #ifndef __LINUX_MBUS_H
 #define __LINUX_MBUS_H
 
+struct resource;
+
 struct mbus_dram_target_info
 {
 	/*
@@ -59,6 +61,8 @@
 }
 #endif
 
+void mvebu_mbus_get_pcie_mem_aperture(struct resource *res);
+void mvebu_mbus_get_pcie_io_aperture(struct resource *res);
 int mvebu_mbus_add_window_remap_flags(const char *devname, phys_addr_t base,
 				      size_t size, phys_addr_t remap,
 				      unsigned int flags);