summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/mm/ioremap.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/mm/ioremap.c')
-rw-r--r--arch/powerpc/mm/ioremap.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c
new file mode 100644
index 000000000..b1a0aebe8
--- /dev/null
+++ b/arch/powerpc/mm/ioremap.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/mmzone.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;
+}
+
+#ifdef CONFIG_ZONE_DEVICE
+/*
+ * Override the generic version in mm/memremap.c.
+ *
+ * With hash translation, the direct-map range is mapped with just one
+ * page size selected by htab_init_page_sizes(). Consult
+ * mmu_psize_defs[] to determine the minimum page size alignment.
+*/
+unsigned long memremap_compat_align(void)
+{
+ unsigned int shift = mmu_psize_defs[mmu_linear_psize].shift;
+
+ if (radix_enabled())
+ return SUBSECTION_SIZE;
+ return max(SUBSECTION_SIZE, 1UL << shift);
+
+}
+EXPORT_SYMBOL_GPL(memremap_compat_align);
+#endif