RISC-V: io.h: type fixes for warnings

include <linux/types.h> for __iomem definition. Also, add volatile to
iounmap() like other architectures have it to avoid "discarding
volatile" warnings from some drivers.

Finally, explicitly promote the base address for INB/OUTB functions to
avoid some old legacy drivers complaining about int-to-ptr promotions.
The drivers are unlikely to work but they're included in allmodconfig
so the warnings are noisy.

Fixes, among other warnings, these with allmodconfig:

../arch/riscv/include/asm/io.h:24:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before '*' token
 extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);

sound/pci/echoaudio/echoaudio.c: In function 'snd_echo_free':
sound/pci/echoaudio/echoaudio.c:1879:10: warning: passing argument 1 of 'iounmap' discards 'volatile' qualifier from pointer target type [-Wdiscarded-qualifiers]
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

arch/riscv/include/asm/io.h

@@ -19,6 +19,8 @@
 #ifndef _ASM_RISCV_IO_H
 #define _ASM_RISCV_IO_H
 
+#include <linux/types.h>
+
 #ifdef CONFIG_MMU
 
 extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
@@ -32,7 +34,7 @@ extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
 #define ioremap_wc(addr, size) ioremap((addr), (size))
 #define ioremap_wt(addr, size) ioremap((addr), (size))
 
-extern void iounmap(void __iomem *addr);
+extern void iounmap(volatile void __iomem *addr);
 
 #endif /* CONFIG_MMU */
 
@@ -266,9 +268,9 @@ __io_reads_ins(reads, u32, l, __io_br(), __io_ar())
 __io_reads_ins(ins,  u8, b, __io_pbr(), __io_par())
 __io_reads_ins(ins, u16, w, __io_pbr(), __io_par())
 __io_reads_ins(ins, u32, l, __io_pbr(), __io_par())
-#define insb(addr, buffer, count) __insb((void __iomem *)addr, buffer, count)
-#define insw(addr, buffer, count) __insw((void __iomem *)addr, buffer, count)
-#define insl(addr, buffer, count) __insl((void __iomem *)addr, buffer, count)
+#define insb(addr, buffer, count) __insb((void __iomem *)(long)addr, buffer, count)
+#define insw(addr, buffer, count) __insw((void __iomem *)(long)addr, buffer, count)
+#define insl(addr, buffer, count) __insl((void __iomem *)(long)addr, buffer, count)
 
 __io_writes_outs(writes,  u8, b, __io_bw(), __io_aw())
 __io_writes_outs(writes, u16, w, __io_bw(), __io_aw())
@@ -280,9 +282,9 @@ __io_writes_outs(writes, u32, l, __io_bw(), __io_aw())
 __io_writes_outs(outs,  u8, b, __io_pbw(), __io_paw())
 __io_writes_outs(outs, u16, w, __io_pbw(), __io_paw())
 __io_writes_outs(outs, u32, l, __io_pbw(), __io_paw())
-#define outsb(addr, buffer, count) __outsb((void __iomem *)addr, buffer, count)
-#define outsw(addr, buffer, count) __outsw((void __iomem *)addr, buffer, count)
-#define outsl(addr, buffer, count) __outsl((void __iomem *)addr, buffer, count)
+#define outsb(addr, buffer, count) __outsb((void __iomem *)(long)addr, buffer, count)
+#define outsw(addr, buffer, count) __outsw((void __iomem *)(long)addr, buffer, count)
+#define outsl(addr, buffer, count) __outsl((void __iomem *)(long)addr, buffer, count)
 
 #ifdef CONFIG_64BIT
 __io_reads_ins(reads, u64, q, __io_br(), __io_ar())

arch/riscv/mm/ioremap.c

@@ -85,7 +85,7 @@ EXPORT_SYMBOL(ioremap);
  *
  * Caller must ensure there is only one unmapping for the same pointer.
  */
-void iounmap(void __iomem *addr)
+void iounmap(volatile void __iomem *addr)
 {
 	vunmap((void *)((unsigned long)addr & PAGE_MASK));
 }