1 files changed, 57 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ioremap_64.c b/arch/powerpc/mm/ioremap_64.c
new file mode 100644
index 000000000..d24e5f166
--- /dev/null
+++ b/arch/powerpc/mm/ioremap_64.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
+			       pgprot_t prot, void *caller)
+{
+	phys_addr_t paligned, offset;
+	void __iomem *ret;
+	int err;
+
+	/* We don't support the 4K PFN hack with ioremap */
+	if (pgprot_val(prot) & H_PAGE_4K_PFN)
+		return NULL;
+
+	/*
+	 * Choose an address to map it to. Once the vmalloc system is running,
+	 * we use it. Before that, we map using addresses going up from
+	 * ioremap_bot.  vmalloc will use the addresses from IOREMAP_BASE
+	 * through ioremap_bot.
+	 */
+	paligned = addr & PAGE_MASK;
+	offset = addr & ~PAGE_MASK;
+	size = PAGE_ALIGN(addr + size) - paligned;
+
+	if (size == 0 || paligned == 0)
+		return NULL;
+
+	if (slab_is_available())
+		return generic_ioremap_prot(addr, size, prot);
+
+	pr_warn("ioremap() called early from %pS. Use early_ioremap() instead\n", caller);
+
+	err = early_ioremap_range(ioremap_bot, paligned, size, prot);
+	if (err)
+		return NULL;
+
+	ret = (void __iomem *)ioremap_bot + offset;
+	ioremap_bot += size + PAGE_SIZE;
+
+	return ret;
+}
+
+/*
+ * Unmap an IO region and remove it from vmalloc'd list.
+ * Access to IO memory should be serialized by driver.
+ */
+void iounmap(volatile void __iomem *token)
+{
+	if (!slab_is_available())
+		return;
+
+	generic_iounmap(PCI_FIX_ADDR(token));
+}
+EXPORT_SYMBOL(iounmap);