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Diffstat (limited to 'arch/xtensa/kernel/setup.c')
-rw-r--r--arch/xtensa/kernel/setup.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index f38badeb7747..7d12af1317f1 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -212,6 +212,42 @@ static int __init parse_bootparam(const bp_tag_t* tag)
#ifdef CONFIG_OF
bool __initdata dt_memory_scan = false;
+#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
+unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
+EXPORT_SYMBOL(xtensa_kio_paddr);
+
+static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ const __be32 *ranges;
+ unsigned long len;
+
+ if (depth > 1)
+ return 0;
+
+ if (!of_flat_dt_is_compatible(node, "simple-bus"))
+ return 0;
+
+ ranges = of_get_flat_dt_prop(node, "ranges", &len);
+ if (!ranges)
+ return 1;
+ if (len == 0)
+ return 1;
+
+ xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
+ /* round down to nearest 256MB boundary */
+ xtensa_kio_paddr &= 0xf0000000;
+
+ return 1;
+}
+#else
+static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
+ int depth, void *data)
+{
+ return 1;
+}
+#endif
+
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
if (!dt_memory_scan)
@@ -232,6 +268,7 @@ void __init early_init_devtree(void *params)
dt_memory_scan = true;
early_init_dt_scan(params);
+ of_scan_flat_dt(xtensa_dt_io_area, NULL);
if (!command_line[0])
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);