powerpc/mm: Move ioremap functions out of pgtable_32/64.c

Create ioremap_32.c and ioremap_64.c and move respective ioremap
functions out of pgtable_32.c and pgtable_64.c

In the meantime, fix a few comments and changes a printk() to
pr_warn(). Also fix a few oversplitted lines.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b5c8b02ccefd4ede64c61b53cf64fb5dacb35740.1566309263.git.christophe.leroy@c-s.fr

1 files changed, 1 insertions, 127 deletions

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index d865e053052d7..e78832dce7bb4 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
- *  This file contains ioremap and related functions for 64-bit machines.
+ *  This file contains pgtable related functions for 64-bit machines.
  *
  *  Derived from arch/ppc64/mm/init.c
  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
@@ -34,7 +34,6 @@
 #include <asm/pgalloc.h>
 #include <asm/page.h>
 #include <asm/prom.h>
-#include <asm/io.h>
 #include <asm/mmu_context.h>
 #include <asm/pgtable.h>
 #include <asm/mmu.h>
@@ -100,131 +99,6 @@ unsigned long __pte_frag_size_shift;
 EXPORT_SYMBOL(__pte_frag_size_shift);
 #endif
 
-int __weak ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid)
-{
-	unsigned long i;
-
-	for (i = 0; i < size; i += PAGE_SIZE) {
-		int err = map_kernel_page(ea + i, pa + i, prot);
-		if (err) {
-			if (slab_is_available())
-				unmap_kernel_range(ea, size);
-			else
-				WARN_ON_ONCE(1); /* Should clean up */
-			return err;
-		}
-	}
-
-	return 0;
-}
-
-/**
- * __ioremap_at - Low level function to establish the page tables
- *                for an IO mapping
- */
-void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot)
-{
-	/* We don't support the 4K PFN hack with ioremap */
-	if (pgprot_val(prot) & H_PAGE_4K_PFN)
-		return NULL;
-
-	if ((ea + size) >= (void *)IOREMAP_END) {
-		pr_warn("Outside the supported range\n");
-		return NULL;
-	}
-
-	WARN_ON(pa & ~PAGE_MASK);
-	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
-	WARN_ON(size & ~PAGE_MASK);
-
-	if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))
-		return NULL;
-
-	return (void __iomem *)ea;
-}
-
-/**
- * __iounmap_from - Low level function to tear down the page tables
- *                  for an IO mapping. This is used for mappings that
- *                  are manipulated manually, like partial unmapping of
- *                  PCI IOs or ISA space.
- */
-void __iounmap_at(void *ea, unsigned long size)
-{
-	WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
-	WARN_ON(size & ~PAGE_MASK);
-
-	unmap_kernel_range((unsigned long)ea, size);
-}
-
-void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
-				pgprot_t prot, void *caller)
-{
-	phys_addr_t paligned;
-	void __iomem *ret;
-
-	/*
-	 * Choose an address to map it to.
-	 * Once the imalloc system is running, we use it.
-	 * Before that, we map using addresses going
-	 * up from ioremap_bot.  imalloc will use
-	 * the addresses from ioremap_bot through
-	 * IMALLOC_END
-	 * 
-	 */
-	paligned = addr & PAGE_MASK;
-	size = PAGE_ALIGN(addr + size) - paligned;
-
-	if ((size == 0) || (paligned == 0))
-		return NULL;
-
-	if (slab_is_available()) {
-		struct vm_struct *area;
-
-		area = __get_vm_area_caller(size, VM_IOREMAP,
-					    ioremap_bot, IOREMAP_END,
-					    caller);
-		if (area == NULL)
-			return NULL;
-
-		area->phys_addr = paligned;
-		ret = __ioremap_at(paligned, area->addr, size, prot);
-	} else {
-		ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot);
-		if (ret)
-			ioremap_bot += size;
-	}
-
-	if (ret)
-		ret += addr & ~PAGE_MASK;
-	return ret;
-}
-
-/*  
- * Unmap an IO region and remove it from imalloc'd list.
- * Access to IO memory should be serialized by driver.
- */
-void iounmap(volatile void __iomem *token)
-{
-	void *addr;
-
-	if (!slab_is_available())
-		return;
-	
-	addr = (void *) ((unsigned long __force)
-			 PCI_FIX_ADDR(token) & PAGE_MASK);
-	if ((unsigned long)addr < ioremap_bot) {
-		printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
-		       " at 0x%p\n", addr);
-		return;
-	}
-	vunmap(addr);
-}
-
-EXPORT_SYMBOL(__ioremap_at);
-EXPORT_SYMBOL(iounmap);
-EXPORT_SYMBOL(__iounmap_at);
-
 #ifndef __PAGETABLE_PUD_FOLDED
 /* 4 level page table */
 struct page *pgd_page(pgd_t pgd)