[PATCH v4 1/2] m68k: io_mm.h - add APNE 100 MBit support

[Michael Schmitz <schmitzmic@gmail.com>]

Add code to support 10 Mbit and 100 Mbit mode for APNE driver.

A new ISA type ISA_TYPE_AG16 dynamically switches the Amiga
ISA inb accessor to word access as required by the 100 Mbit cards.

Patch modified after patch "[PATCH RFC net-next] Amiga PCMCIA
100 MBit card support" submitted to netdev 2018/09/16 by Alex
Kazik <alex@kazik.de>.

Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

--
Changes from v3:

Finn Thain:
- revert isa_inb() define reordering
- omit redundant #ifdef around ISA_TYPE_AG16 case labels

Changes from v1:

Andreas Schwab:
- remove redundant fallthrough annotations

Changes from RFC:

Geert Uytterhoeven:
- rename ISA_TYPE_AG100 to ISA_TYPE_AG16 (16 bit cards)
- move ISA_TYPE_AG16 case inside #ifdef CONFIG_AMIGA_PCMCIA
- change #if defined(CONFIG_APNE_100MBIT) to #ifdef
- fix parentheses in isa_inb() define
- omit comment about compiler optimization

- add ISA_TYPE_AG16 case to isa_delay()
---
 arch/m68k/include/asm/io_mm.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index 9c521b0..6a037c1 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -101,6 +101,11 @@
 #define ISA_TYPE_Q40  (1)
 #define ISA_TYPE_AG   (2)
 #define ISA_TYPE_ENEC (3)
+#define ISA_TYPE_AG16 (4)	/* for 100 MBit APNE card */
+
+#if defined(CONFIG_APNE100MBIT)
+#define MULTI_ISA 1
+#endif
 
 #if defined(CONFIG_Q40) && !defined(MULTI_ISA)
 #define ISA_TYPE ISA_TYPE_Q40
@@ -136,6 +141,7 @@ static inline u8 __iomem *isa_itb(unsigned long addr)
     case ISA_TYPE_Q40: return (u8 __iomem *)Q40_ISA_IO_B(addr);
 #endif
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16:
     case ISA_TYPE_AG: return (u8 __iomem *)AG_ISA_IO_B(addr);
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
@@ -155,6 +161,7 @@ static inline u16 __iomem *isa_itw(unsigned long addr)
     case ISA_TYPE_Q40: return (u16 __iomem *)Q40_ISA_IO_W(addr);
 #endif
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16:
     case ISA_TYPE_AG: return (u16 __iomem *)AG_ISA_IO_W(addr);
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
@@ -171,6 +178,7 @@ static inline u32 __iomem *isa_itl(unsigned long addr)
   switch(ISA_TYPE)
     {
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16:
     case ISA_TYPE_AG: return (u32 __iomem *)AG_ISA_IO_W(addr);
 #endif
     }
@@ -184,6 +192,7 @@ static inline u8 __iomem *isa_mtb(unsigned long addr)
     case ISA_TYPE_Q40: return (u8 __iomem *)Q40_ISA_MEM_B(addr);
 #endif
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16:
     case ISA_TYPE_AG: return (u8 __iomem *)addr;
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
@@ -203,6 +212,7 @@ static inline u16 __iomem *isa_mtw(unsigned long addr)
     case ISA_TYPE_Q40: return (u16 __iomem *)Q40_ISA_MEM_W(addr);
 #endif
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16:
     case ISA_TYPE_AG: return (u16 __iomem *)addr;
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
@@ -216,7 +226,7 @@ static inline u16 __iomem *isa_mtw(unsigned long addr)
 }
 
 
-#define isa_inb(port)      in_8(isa_itb(port))
+#define isa_inb(port)      ((ISA_TYPE == ISA_TYPE_AG16) ? ((port) & 1 ? isa_inw((port) - 1) & 0xff : isa_inw(port) >> 8) : in_8(isa_itb(port)))
 #define isa_inw(port)      (ISA_SEX ? in_be16(isa_itw(port)) : in_le16(isa_itw(port)))
 #define isa_inl(port)      (ISA_SEX ? in_be32(isa_itl(port)) : in_le32(isa_itl(port)))
 #define isa_outb(val,port) out_8(isa_itb(port),(val))
@@ -270,6 +280,7 @@ static inline void isa_delay(void)
     case ISA_TYPE_Q40: isa_outb(0,0x80); break;
 #endif
 #ifdef CONFIG_AMIGA_PCMCIA
+    case ISA_TYPE_AG16: break;
     case ISA_TYPE_AG: break;
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
-- 
2.7.4