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

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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 <[email protected]>
Tested-by: Andrew Lunn <[email protected]>
Tested-by: Sebastian Hesselbarth <[email protected]>
Signed-off-by: Jason Cooper <[email protected]>
This commit is contained in:
Ezequiel Garcia 2013-07-26 10:17:47 -03:00 • committed by Jason Cooper
commit 79d946837c
2 changed files with 53 additions and 0 deletions
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49
drivers/bus/mvebu-mbus.c
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@ -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),