diff options
Diffstat (limited to 'arch/arc/lib')
| -rw-r--r-- | arch/arc/lib/cache.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c index f1436bf..cbae27e 100644 --- a/arch/arc/lib/cache.c +++ b/arch/arc/lib/cache.c @@ -8,6 +8,7 @@ #include <common.h> #include <linux/compiler.h> #include <linux/kernel.h> +#include <linux/log2.h> #include <asm/arcregs.h> #include <asm/cache.h> @@ -215,17 +216,33 @@ void cache_init(void) read_decode_cache_bcr_arcv2(); if (ioc_exists) { + /* IOC Aperture start is equal to DDR start */ + unsigned int ap_base = CONFIG_SYS_SDRAM_BASE; + /* IOC Aperture size is equal to DDR size */ + long ap_size = CONFIG_SYS_SDRAM_SIZE; + flush_dcache_all(); invalidate_dcache_all(); - /* IO coherency base - 0x8z */ - write_aux_reg(ARC_AUX_IO_COH_AP0_BASE, 0x80000); - /* IO coherency aperture size - 512Mb: 0x8z-0xAz */ - write_aux_reg(ARC_AUX_IO_COH_AP0_SIZE, 0x11); - /* Enable partial writes */ + if (!is_power_of_2(ap_size) || ap_size < 4096) + panic("IOC Aperture size must be power of 2 and bigger 4Kib"); + + /* + * IOC Aperture size decoded as 2 ^ (SIZE + 2) KB, + * so setting 0x11 implies 512M, 0x12 implies 1G... + */ + write_aux_reg(ARC_AUX_IO_COH_AP0_SIZE, + order_base_2(ap_size/1024) - 2); + + + /* IOC Aperture start must be aligned to the size of the aperture */ + if (ap_base % ap_size != 0) + panic("IOC Aperture start must be aligned to the size of the aperture"); + + write_aux_reg(ARC_AUX_IO_COH_AP0_BASE, ap_base >> 12); write_aux_reg(ARC_AUX_IO_COH_PARTIAL, 1); - /* Enable IO coherency */ write_aux_reg(ARC_AUX_IO_COH_ENABLE, 1); + } #endif } |