diff options
Diffstat (limited to 'arch/xtensa/kernel/setup.c')
| -rw-r--r-- | arch/xtensa/kernel/setup.c | 37 |
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); |