1 files changed, 99 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
new file mode 100644
index 000000000000..fc669643ce6a
--- /dev/null
+++ b/arch/powerpc/mm/ioremap.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <asm/io-workarounds.h>
+
+unsigned long ioremap_bot;
+EXPORT_SYMBOL(ioremap_bot);
+
+void __iomem *ioremap(phys_addr_t addr, unsigned long size)
+{
+	pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
+	void *caller = __builtin_return_address(0);
+
+	if (iowa_is_active())
+		return iowa_ioremap(addr, size, prot, caller);
+	return __ioremap_caller(addr, size, prot, caller);
+}
+EXPORT_SYMBOL(ioremap);
+
+void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
+{
+	pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
+	void *caller = __builtin_return_address(0);
+
+	if (iowa_is_active())
+		return iowa_ioremap(addr, size, prot, caller);
+	return __ioremap_caller(addr, size, prot, caller);
+}
+EXPORT_SYMBOL(ioremap_wc);
+
+void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
+{
+	pgprot_t prot = pgprot_cached(PAGE_KERNEL);
+	void *caller = __builtin_return_address(0);
+
+	if (iowa_is_active())
+		return iowa_ioremap(addr, size, prot, caller);
+	return __ioremap_caller(addr, size, prot, caller);
+}
+
+void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
+{
+	pte_t pte = __pte(flags);
+	void *caller = __builtin_return_address(0);
+
+	/* writeable implies dirty for kernel addresses */
+	if (pte_write(pte))
+		pte = pte_mkdirty(pte);
+
+	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
+	pte = pte_exprotect(pte);
+	pte = pte_mkprivileged(pte);
+
+	if (iowa_is_active())
+		return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
+	return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
+}
+EXPORT_SYMBOL(ioremap_prot);
+
+int early_ioremap_range(unsigned long ea, phys_addr_t pa,
+			unsigned long size, pgprot_t prot)
+{
+	unsigned long i;
+
+	for (i = 0; i < size; i += PAGE_SIZE) {
+		int err = map_kernel_page(ea + i, pa + i, prot);
+
+		if (WARN_ON_ONCE(err))  /* Should clean up */
+			return err;
+	}
+
+	return 0;
+}
+
+void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
+			 pgprot_t prot, void *caller)
+{
+	struct vm_struct *area;
+	int ret;
+	unsigned long va;
+
+	area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller);
+	if (area == NULL)
+		return NULL;
+
+	area->phys_addr = pa;
+	va = (unsigned long)area->addr;
+
+	ret = ioremap_page_range(va, va + size, pa, prot);
+	if (!ret)
+		return (void __iomem *)area->addr + offset;
+
+	unmap_kernel_range(va, size);
+	free_vm_area(area);
+
+	return NULL;
+}