By taking GENERIC_IOREMAP method, the generic generic_ioremap_prot(),
generic_iounmap(), and their generic wrapper ioremap_prot(), ioremap()
and iounmap() are all visible and available to arch. Arch needs to
provide wrapper functions to override the generic versions if there's
arch specific handling in its ioremap_prot(), ioremap() or iounmap().
This change will simplify implementation by removing duplicated codes
with generic_ioremap_prot() and generic_iounmap(), and has the equivalent
functioality as before.
Here, add wrapper function iounmap() for openrisc's special operation
when iounmap().
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
Cc: openrisc@xxxxxxxxxxxxxxxxxxxx
---
arch/openrisc/Kconfig | 1 +
arch/openrisc/include/asm/io.h | 11 +++++---
arch/openrisc/mm/ioremap.c | 46 +---------------------------------
3 files changed, 9 insertions(+), 49 deletions(-)
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index c7f282f60f64..fd9bb76a610b 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -21,6 +21,7 @@ config OPENRISC
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
+ select GENERIC_IOREMAP
select GENERIC_CPU_DEVICES
select HAVE_PCI
select HAVE_UID16
diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h
index ee6043a03173..e640960c26c2 100644
--- a/arch/openrisc/include/asm/io.h
+++ b/arch/openrisc/include/asm/io.h
@@ -15,6 +15,8 @@
#define __ASM_OPENRISC_IO_H
#include <linux/types.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
/*
* PCI: We do not use IO ports in OpenRISC
@@ -27,11 +29,12 @@
#define PIO_OFFSET 0
#define PIO_MASK 0
-#define ioremap ioremap
-void __iomem *ioremap(phys_addr_t offset, unsigned long size);
-
+/*
+ * I/O memory mapping functions.
+ */
#define iounmap iounmap
-extern void iounmap(volatile void __iomem *addr);
+
+#define _PAGE_IOREMAP (pgprot_val(PAGE_KERNEL) | _PAGE_CI)
#include <asm-generic/io.h>
diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
index 90b59bc53c8c..9f9941df7d4c 100644
--- a/arch/openrisc/mm/ioremap.c
+++ b/arch/openrisc/mm/ioremap.c
@@ -22,49 +22,6 @@
extern int mem_init_done;
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- */
-void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
-{
- phys_addr_t p;
- unsigned long v;
- unsigned long offset, last_addr;
- struct vm_struct *area = NULL;
-
- /* Don't allow wraparound or zero size */
- last_addr = addr + size - 1;
- if (!size || last_addr < addr)
- return NULL;
-
- /*
- * Mappings have to be page-aligned
- */
- offset = addr & ~PAGE_MASK;
- p = addr & PAGE_MASK;
- size = PAGE_ALIGN(last_addr + 1) - p;
-
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
- v = (unsigned long)area->addr;
-
- if (ioremap_page_range(v, v + size, p,
- __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
- vfree(area->addr);
- return NULL;
- }
-
- return (void __iomem *)(offset + (char *)v);
-}
-EXPORT_SYMBOL(ioremap);
-
void iounmap(volatile void __iomem *addr)
{
/* If the page is from the fixmap pool then we just clear out
@@ -88,9 +45,8 @@ void iounmap(volatile void __iomem *addr)
return;
}
- return vfree((void *)(PAGE_MASK & (unsigned long)addr));
+ generic_iounmap(addr);
}
-EXPORT_SYMBOL(iounmap);
/**
* OK, this one's a bit tricky... ioremap can get called before memory is
--
2.34.1
