mips: drop GENERIC_IOMAP wrapper

All PIO on MIPS platforms is memory mapped, so there is no benefit in
the lib/iomap.c wrappers that switch between inb/outb and readb/writeb
style accessses.

In fact, the '#define PIO_RESERVED 0' setting completely disables
the GENERIC_IOMAP functionality, and the '#define PIO_OFFSET
mips_io_port_base' setting is based on a misunderstanding of what the
offset is meant to do.

MIPS started using GENERIC_IOMAP in 2018 with commit b962aeb02205 ("MIPS:
Use GENERIC_IOMAP") replacing a simple custom implementation of the same
interfaces, but at the time the asm-generic/io.h version was not usable
yet. Since the header is now always included, it's now possible to go
back to the even simpler version.

Use the normal GENERIC_PCI_IOMAP functionality for all mips platforms
without the hacky GENERIC_IOMAP, and provide a custom pci_iounmap()
for the CONFIG_PCI_DRIVERS_LEGACY case to ensure the I/O port base never
gets unmapped.

The readsl() prototype needs an extra 'const' keyword to make it
compatible with the generic ioread32_rep() alias.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 8 insertions, 13 deletions

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 0bddb568af7c..1fe56d1870a6 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -67,17 +67,6 @@ static inline void set_io_port_base(unsigned long base)
 }
 
 /*
- * Provide the necessary definitions for generic iomap. We make use of
- * mips_io_port_base for iomap(), but we don't reserve any low addresses for
- * use with I/O ports.
- */
-
-#define HAVE_ARCH_PIO_SIZE
-#define PIO_OFFSET	mips_io_port_base
-#define PIO_MASK	IO_SPACE_LIMIT
-#define PIO_RESERVED	0x0UL
-
-/*
  * Enforce in-order execution of data I/O.  In the MIPS architecture
  * these are equivalent to corresponding platform-specific memory
  * barriers defined in <asm/barrier.h>.  API pinched from PowerPC,
@@ -397,8 +386,8 @@ static inline void writes##bwlq(volatile void __iomem *mem,		\
 	}								\
 }									\
 									\
-static inline void reads##bwlq(volatile void __iomem *mem, void *addr,	\
-			       unsigned int count)			\
+static inline void reads##bwlq(const volatile void __iomem *mem,	\
+			       void *addr, unsigned int count)		\
 {									\
 	volatile type *__addr = addr;					\
 									\
@@ -555,6 +544,12 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
 
 void __ioread64_copy(void *to, const void __iomem *from, size_t count);
 
+#ifdef CONFIG_PCI_DRIVERS_LEGACY
+struct pci_dev;
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
+#define pci_iounmap pci_iounmap
+#endif
+
 #include <asm-generic/io.h>
 
 static inline void *isa_bus_to_virt(unsigned long address)