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authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>2013-07-26 17:17:47 +0400
committerJason Cooper <jason@lakedaemon.net>2013-08-06 18:10:34 +0400
commit79d946837c042fba3e9ba2726f3cfa56aa408e16 (patch)
tree653155108fb343b6ef5f5a40b8f601d351f0fcd8 /drivers/bus
parentbb24cab39c7b6971db88d9a72d8d661b9ee887ea (diff)
downloadlinux-79d946837c042fba3e9ba2726f3cfa56aa408e16.tar.xz
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>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/mvebu-mbus.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 78b8c0436f0b..929fed1f6eb9 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -142,6 +142,8 @@ struct mvebu_mbus_state {
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 @@ int mvebu_mbus_del_window(phys_addr_t base, size_t size)
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 @@ static int __init mbus_dt_setup(struct mvebu_mbus_state *mbus,
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 @@ int __init mvebu_mbus_dt_init(void)
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),