1 files changed, 100 insertions, 0 deletions
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
new file mode 100644
index 000000000..345ff0b66
--- /dev/null
+++ b/arch/parisc/mm/ioremap.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/parisc/mm/ioremap.c
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2001-2019 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 <linux/mm.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)
+{
+	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);
+#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 | _PAGE_NO_CACHE);
+
+	/*
+	 * 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)) {
+		vunmap(addr);
+		return NULL;
+	}
+
+	return (void __iomem *) (offset + (char __iomem *)addr);
+}
+EXPORT_SYMBOL(ioremap);
+
+void iounmap(const volatile void __iomem *io_addr)
+{
+	unsigned long addr = (unsigned long)io_addr & PAGE_MASK;
+
+	if (is_vmalloc_addr((void *)addr))
+		vunmap((void *)addr);
+}
+EXPORT_SYMBOL(iounmap);