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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/parisc/mm/ioremap.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/parisc/mm/ioremap.c')
-rw-r--r--kernel/arch/parisc/mm/ioremap.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/kernel/arch/parisc/mm/ioremap.c b/kernel/arch/parisc/mm/ioremap.c
new file mode 100644
index 000000000..838d0259c
--- /dev/null
+++ b/kernel/arch/parisc/mm/ioremap.c
@@ -0,0 +1,99 @@
+/*
+ * arch/parisc/mm/ioremap.c
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2001-2006 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <asm/pgalloc.h>
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+ void __iomem *addr;
+ struct vm_struct *area;
+ unsigned long offset, last_addr;
+ pgprot_t pgprot;
+
+#ifdef CONFIG_EISA
+ unsigned long end = phys_addr + size - 1;
+ /* Support EISA addresses */
+ if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
+ (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
+ phys_addr |= F_EXTEND(0xfc000000);
+ flags |= _PAGE_NO_CACHE;
+ }
+#endif
+
+ /* Don't allow wraparound or zero size */
+ last_addr = phys_addr + size - 1;
+ if (!size || last_addr < phys_addr)
+ return NULL;
+
+ /*
+ * Don't allow anybody to remap normal RAM that we're using..
+ */
+ if (phys_addr < virt_to_phys(high_memory)) {
+ char *t_addr, *t_end;
+ struct page *page;
+
+ t_addr = __va(phys_addr);
+ t_end = t_addr + (size - 1);
+
+ for (page = virt_to_page(t_addr);
+ page <= virt_to_page(t_end); page++) {
+ if(!PageReserved(page))
+ return NULL;
+ }
+ }
+
+ pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
+ _PAGE_ACCESSED | flags);
+
+ /*
+ * Mappings have to be page-aligned
+ */
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+ /*
+ * Ok, go for it..
+ */
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+
+ addr = (void __iomem *) area->addr;
+ if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
+ phys_addr, pgprot)) {
+ vfree(addr);
+ return NULL;
+ }
+
+ return (void __iomem *) (offset + (char __iomem *)addr);
+}
+EXPORT_SYMBOL(__ioremap);
+
+void iounmap(const volatile void __iomem *addr)
+{
+ if (addr > high_memory)
+ return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
+}
+EXPORT_SYMBOL(iounmap);