microblaze: PCI early support for noMMU system

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/include/asm/pgalloc.h

@@ -19,6 +19,7 @@
 #include <asm/io.h>
 #include <asm/page.h>
 #include <asm/cache.h>
+#include <asm/pgtable.h>
 
 #define PGDIR_ORDER	0
 
@@ -111,7 +112,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 		unsigned long address)
 {
 	pte_t *pte;
-	extern int mem_init_done;
 	extern void *early_get_page(void);
 	if (mem_init_done) {
 		pte = (pte_t *)__get_free_page(GFP_KERNEL |

arch/microblaze/include/asm/pgtable.h

@@ -16,6 +16,10 @@
 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
 		remap_pfn_range(vma, vaddr, pfn, size, prot)
 
+#ifndef __ASSEMBLY__
+extern int mem_init_done;
+#endif
+
 #ifndef CONFIG_MMU
 
 #define pgd_present(pgd)	(1) /* pages are always present on non MMU */
@@ -51,6 +55,8 @@ static inline int pte_file(pte_t pte) { return 0; }
 
 #define arch_enter_lazy_cpu_mode()	do {} while (0)
 
+#define pgprot_noncached_wc(prot)	prot
+
 #else /* CONFIG_MMU */
 
 #include <asm-generic/4level-fixup.h>

arch/microblaze/mm/init.c

@@ -23,6 +23,9 @@
 #include <asm/sections.h>
 #include <asm/tlb.h>
 
+/* Use for MMU and noMMU because of PCI generic code */
+int mem_init_done;
+
 #ifndef CONFIG_MMU
 unsigned int __page_offset;
 EXPORT_SYMBOL(__page_offset);
@@ -30,7 +33,6 @@ EXPORT_SYMBOL(__page_offset);
 #else
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
-int mem_init_done;
 static int init_bootmem_done;
 #endif /* CONFIG_MMU */
 
@@ -202,9 +204,7 @@ void __init mem_init(void)
 	printk(KERN_INFO "Memory: %luk/%luk available\n",
 	       nr_free_pages() << (PAGE_SHIFT-10),
 	       num_physpages << (PAGE_SHIFT-10));
-#ifdef CONFIG_MMU
 	mem_init_done = 1;
-#endif
 }
 
 #ifndef CONFIG_MMU
@@ -216,6 +216,10 @@ int ___range_ok(unsigned long addr, unsigned long size)
 }
 EXPORT_SYMBOL(___range_ok);
 
+int page_is_ram(unsigned long pfn)
+{
+	return __range_ok(pfn, 0);
+}
 #else
 int page_is_ram(unsigned long pfn)
 {
@@ -344,6 +348,8 @@ void __init *early_get_page(void)
 	return p;
 }
 
+#endif /* CONFIG_MMU */
+
 void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
 {
 	if (mem_init_done)
@@ -365,5 +371,3 @@ void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
 	}
 	return p;
 }
-
-#endif /* CONFIG_MMU */

arch/microblaze/pci/pci-common.c

@@ -561,11 +561,13 @@ int pci_mmap_legacy_page_range(struct pci_bus *bus,
 		 * memory, effectively behaving just like /dev/zero
 		 */
 		if ((offset + size) > hose->isa_mem_size) {
+#ifdef CONFIG_MMU
 			printk(KERN_DEBUG
 				"Process %s (pid:%d) mapped non-existing PCI"
 				"legacy memory for 0%04x:%02x\n",
 				current->comm, current->pid, pci_domain_nr(bus),
 								bus->number);
+#endif
 			if (vma->vm_flags & VM_SHARED)
 				return shmem_zero_setup(vma);
 			return 0;