From 2f47f44790a9c8fc43e515df3c6be19a35ee5de5 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Tue, 10 Mar 2009 15:49:54 +0900 Subject: sh: Support fixed 32-bit PMB mappings from bootloader. This provides a method for supporting fixed PMB mappings inherited from the bootloader, as an alternative to the dynamic PMB mapping currently used by the kernel. In the future these methods will be combined. P1/P2 area is handled like a regular 29-bit physical address, and local bus device are assigned P3 area addresses. Signed-off-by: Yoshihiro Shimoda Signed-off-by: Paul Mundt --- arch/sh/mm/pmb-fixed.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/sh/mm/pmb-fixed.c (limited to 'arch/sh/mm/pmb-fixed.c') diff --git a/arch/sh/mm/pmb-fixed.c b/arch/sh/mm/pmb-fixed.c new file mode 100644 index 00000000000..43c8eac4d8a --- /dev/null +++ b/arch/sh/mm/pmb-fixed.c @@ -0,0 +1,45 @@ +/* + * arch/sh/mm/fixed_pmb.c + * + * Copyright (C) 2009 Renesas Solutions Corp. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include +#include +#include +#include +#include + +static int __uses_jump_to_uncached fixed_pmb_init(void) +{ + int i; + unsigned long addr, data; + + jump_to_uncached(); + + for (i = 0; i < PMB_ENTRY_MAX; i++) { + addr = PMB_DATA + (i << PMB_E_SHIFT); + data = ctrl_inl(addr); + if (!(data & PMB_V)) + continue; + + if (data & PMB_C) { +#if defined(CONFIG_CACHE_WRITETHROUGH) + data |= PMB_WT; +#elif defined(CONFIG_CACHE_WRITEBACK) + data &= ~PMB_WT; +#else + data &= ~(PMB_C | PMB_WT); +#endif + } + ctrl_outl(data, addr); + } + + back_to_cached(); + + return 0; +} +arch_initcall(fixed_pmb_init); -- cgit v1.2.3