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From: Michael Schmitz <schmitzmic@gmail.com>
To: linux-m68k@vger.kernel.org, geert@linux-m68k.org
Cc: linux-ide@vger.kernel.org, fthain@linux-m68k.org,
	Michael Schmitz <schmitzmic@gmail.com>
Subject: [PATCH v2] m68k: io_mm.h: conditionalize ISA address translation on Atari
Date: Wed,  9 Jun 2021 19:22:02 +1200	[thread overview]
Message-ID: <1623223322-4242-1-git-send-email-schmitzmic@gmail.com> (raw)
In-Reply-To: <1622957313-321-1-git-send-email-schmitzmic@gmail.com>

Current io_mm.h uses address translation and ROM port IO primitives when
port addresses are below 1024, and raw untranslated MMIO IO primitives
else when CONFIG_ATARI_ROM_ISA is set. This is done regardless of the
m68k machine type a multi-platform kernel runs on. As a consequence,
the Q40 IDE driver in multiplatform kernels cannot work.
Conversely, the Atari IDE driver uses wrong address translation if a
multiplatform Q40 and Atari kernel does _not_ set CONFIG_ATARI_ROM_ISA.

Replace MMIO by ISA IO primitives for addresses > 1024 (if isa_type
is ISA_TYPE_ENEC), and change the ISA address translation used for
Atari to a no-op for those addresses.

Switch readb()/writeb() and readw()/writew() to their ISA equivalents
also. Change the address translation functions to return the identity
translation if CONFIG_ATARI_ROM_ISA is not defined, and set MULTI_ISA
for kernels where Q40 and Atari are both configured so this can actually
work (isa_type set to Q40 at compile time else).

Fixes:  84b16b7b0d5c818f ("m68k/atari: ROM port ISA adapter support")
Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>

--
Changes from v1:

Geert Uytterhoeven;
- fix Fixes tag
- remove comment about isa_sex zero initialization
- move default return outside switch statement in address
  translation functions to allow other code to break to default.
- fix indentation in switch statement

Changes from RFC:

Geert Uytterhoeven;
- drop setup_mm.c patch

Finn Thain:
- Add 'Fixes' tag
- Annotate rationale for MULTI_ISA setting on Atari
- Use fallthrough macro annotation in Atari address translation
---
 arch/m68k/include/asm/io_mm.h | 66 +++++++++++++++++++++++++++----------------
 1 file changed, 41 insertions(+), 25 deletions(-)

diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index d41fa48..6eae9ec 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -52,7 +52,11 @@
 #define Q40_ISA_MEM_B(madr)  (q40_isa_mem_base+1+4*((unsigned long)(madr)))
 #define Q40_ISA_MEM_W(madr)  (q40_isa_mem_base+  4*((unsigned long)(madr)))
 
+#ifdef CONFIG_ATARI
+#define MULTI_ISA 1	/* Need MULTI_ISA if Atari drivers (IDE) present !! */
+#else
 #define MULTI_ISA 0
+#endif /* Atari */
 #endif /* Q40 */
 
 #ifdef CONFIG_AMIGA_PCMCIA
@@ -135,10 +139,13 @@ static inline u8 __iomem *isa_itb(unsigned long addr)
     case ISA_TYPE_AG: return (u8 __iomem *)AG_ISA_IO_B(addr);
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
-    case ISA_TYPE_ENEC: return (u8 __iomem *)ENEC_ISA_IO_B(addr);
+    case ISA_TYPE_ENEC:
+	if (addr < 1024)
+		return (u8 __iomem *)ENEC_ISA_IO_B(addr);
+	break; /* not ROM port? fallback below! */
 #endif
-    default: return NULL; /* avoid warnings, just in case */
     }
+    return (u8 __iomem *)(addr); /* avoid warnings, just in case */
 }
 static inline u16 __iomem *isa_itw(unsigned long addr)
 {
@@ -151,10 +158,13 @@ static inline u16 __iomem *isa_itw(unsigned long addr)
     case ISA_TYPE_AG: return (u16 __iomem *)AG_ISA_IO_W(addr);
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
-    case ISA_TYPE_ENEC: return (u16 __iomem *)ENEC_ISA_IO_W(addr);
+    case ISA_TYPE_ENEC:
+	if (addr < 1024)
+		return (u16 __iomem *)ENEC_ISA_IO_W(addr);
+	break; /* not ROM port? fallback below! */
 #endif
-    default: return NULL; /* avoid warnings, just in case */
     }
+    return (u16 __iomem *)(addr); /* avoid warnings, just in case */
 }
 static inline u32 __iomem *isa_itl(unsigned long addr)
 {
@@ -163,8 +173,8 @@ static inline u32 __iomem *isa_itl(unsigned long addr)
 #ifdef CONFIG_AMIGA_PCMCIA
     case ISA_TYPE_AG: return (u32 __iomem *)AG_ISA_IO_W(addr);
 #endif
-    default: return 0; /* avoid warnings, just in case */
     }
+    return 0; /* avoid warnings, just in case */
 }
 static inline u8 __iomem *isa_mtb(unsigned long addr)
 {
@@ -177,10 +187,13 @@ static inline u8 __iomem *isa_mtb(unsigned long addr)
     case ISA_TYPE_AG: return (u8 __iomem *)addr;
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
-    case ISA_TYPE_ENEC: return (u8 __iomem *)ENEC_ISA_MEM_B(addr);
+    case ISA_TYPE_ENEC:
+	if (addr < 1024)
+		return (u8 __iomem *)ENEC_ISA_MEM_B(addr);
+	break; /* not ROM port? fallback below! */
 #endif
-    default: return NULL; /* avoid warnings, just in case */
     }
+    return (u8 __iomem *)(addr); /* avoid warnings, just in case */
 }
 static inline u16 __iomem *isa_mtw(unsigned long addr)
 {
@@ -193,10 +206,13 @@ static inline u16 __iomem *isa_mtw(unsigned long addr)
     case ISA_TYPE_AG: return (u16 __iomem *)addr;
 #endif
 #ifdef CONFIG_ATARI_ROM_ISA
-    case ISA_TYPE_ENEC: return (u16 __iomem *)ENEC_ISA_MEM_W(addr);
+    case ISA_TYPE_ENEC:
+	if (addr < 1024)
+		return (u16 __iomem *)ENEC_ISA_MEM_W(addr);
+	break; /* not ROM port? fallback below! */
 #endif
-    default: return NULL; /* avoid warnings, just in case */
     }
+    return (u16 __iomem *)(addr); /* avoid warnings, just in case */
 }
 
 
@@ -344,31 +360,31 @@ static inline void isa_delay(void)
  * ROM port ISA and everything else regular ISA for IDE. read,write defined
  * below.
  */
-#define inb(port)	((port) < 1024 ? isa_rom_inb(port) : in_8(port))
-#define inb_p(port)	((port) < 1024 ? isa_rom_inb_p(port) : in_8(port))
-#define inw(port)	((port) < 1024 ? isa_rom_inw(port) : in_le16(port))
-#define inw_p(port)	((port) < 1024 ? isa_rom_inw_p(port) : in_le16(port))
+#define inb(port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_inb(port) : isa_inb(port))
+#define inb_p(port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_inb_p(port) : isa_inb_p(port))
+#define inw(port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_inw(port) : isa_inw(port))
+#define inw_p(port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_inw_p(port) : isa_inw_p(port))
 #define inl		isa_inl
 #define inl_p		isa_inl_p
 
-#define outb(val, port)	((port) < 1024 ? isa_rom_outb((val), (port)) : out_8((port), (val)))
-#define outb_p(val, port) ((port) < 1024 ? isa_rom_outb_p((val), (port)) : out_8((port), (val)))
-#define outw(val, port)	((port) < 1024 ? isa_rom_outw((val), (port)) : out_le16((port), (val)))
-#define outw_p(val, port) ((port) < 1024 ? isa_rom_outw_p((val), (port)) : out_le16((port), (val)))
+#define outb(val, port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outb((val), (port)) : isa_outb((val), (port)))
+#define outb_p(val, port) (((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outb_p((val), (port)) : isa_outb_p((val), (port)))
+#define outw(val, port)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outw((val), (port)) : isa_outw((val), (port)))
+#define outw_p(val, port) (((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outw_p((val), (port)) : isa_outw_p((val), (port)))
 #define outl		isa_outl
 #define outl_p		isa_outl_p
 
-#define insb(port, buf, nr)	((port) < 1024 ? isa_rom_insb((port), (buf), (nr)) : isa_insb((port), (buf), (nr)))
-#define insw(port, buf, nr)	((port) < 1024 ? isa_rom_insw((port), (buf), (nr)) : isa_insw((port), (buf), (nr)))
+#define insb(port, buf, nr)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_insb((port), (buf), (nr)) : isa_insb((port), (buf), (nr)))
+#define insw(port, buf, nr)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_insw((port), (buf), (nr)) : isa_insw((port), (buf), (nr)))
 #define insl			isa_insl
-#define outsb(port, buf, nr)	((port) < 1024 ? isa_rom_outsb((port), (buf), (nr)) : isa_outsb((port), (buf), (nr)))
-#define outsw(port, buf, nr)	((port) < 1024 ? isa_rom_outsw((port), (buf), (nr)) : isa_outsw((port), (buf), (nr)))
+#define outsb(port, buf, nr)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outsb((port), (buf), (nr)) : isa_outsb((port), (buf), (nr)))
+#define outsw(port, buf, nr)	(((port) < 1024 && ISA_TYPE == ISA_TYPE_ENEC) ? isa_rom_outsw((port), (buf), (nr)) : isa_outsw((port), (buf), (nr)))
 #define outsl			isa_outsl
 
-#define readb(addr)		in_8(addr)
-#define writeb(val, addr)	out_8((addr), (val))
-#define readw(addr)		in_le16(addr)
-#define writew(val, addr)	out_le16((addr), (val))
+#define readb   isa_readb
+#define readw   isa_readw
+#define writeb  isa_writeb
+#define writew  isa_writew
 #endif /* CONFIG_ATARI_ROM_ISA */
 
 #define readl(addr)      in_le32(addr)
-- 
2.7.4


  parent reply	other threads:[~2021-06-09  7:22 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAMuHMdUskb3oicq8Kbf6MY_4mn4-Y1pJ-om4fny7k48gndscgg@mail.gmail.com>
2021-06-02  5:21 ` [PATCH RFC 0/2] Fix m68k multiplatform ISA support Michael Schmitz
2021-06-02  5:21   ` [PATCH RFC 1/2] m68k: io_mm.h: conditionalize ISA address translation on Atari Michael Schmitz
2021-06-03  8:23     ` Finn Thain
2021-06-04  0:19       ` Michael Schmitz
2021-06-04  5:55         ` Finn Thain
2021-06-04  7:30           ` Michael Schmitz
2021-06-04 22:49             ` Brad Boyer
2021-06-05  1:41               ` Michael Schmitz
2021-06-05  6:04                 ` Brad Boyer
2021-06-05 22:05                   ` Michael Schmitz
2021-06-06  2:18                   ` Michael Schmitz
2021-06-06  4:53                     ` Finn Thain
2021-06-06  5:42                       ` Michael Schmitz
2021-06-06 23:51                         ` Brad Boyer
2021-06-06  5:54                   ` [PATCH RFC 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-06  5:54                     ` [PATCH RFC 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-07  8:01                       ` Geert Uytterhoeven
2021-06-07  8:20                         ` Michael Schmitz
2021-06-07 11:15                       ` Geert Uytterhoeven
2021-06-07 19:57                         ` Michael Schmitz
2021-06-08  6:42                           ` Geert Uytterhoeven
2021-06-08 21:55                             ` Michael Schmitz
2021-06-09  6:33                               ` Geert Uytterhoeven
2021-06-08 21:56                             ` Michael Schmitz
2021-06-06  5:54                     ` [PATCH RFC 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-07  8:08                       ` Geert Uytterhoeven
2021-06-07  8:40                         ` Michael Schmitz
2021-06-07  8:46                           ` ALeX Kazik
2021-06-08  3:10                             ` Michael Schmitz
2021-06-07  8:37                       ` Geert Uytterhoeven
2021-06-07 12:56                       ` Geert Uytterhoeven
2021-06-09  7:36                     ` [PATCH v1 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-09  7:36                       ` [PATCH v1 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-09  8:04                         ` Andreas Schwab
2021-06-09 21:54                           ` Michael Schmitz
2021-06-10  1:09                             ` Finn Thain
2021-06-10  7:32                               ` Geert Uytterhoeven
2021-06-11  2:15                                 ` Michael Schmitz
2021-06-10  8:53                             ` Andreas Schwab
2021-06-09  7:36                       ` [PATCH v1 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-10  2:09                       ` [PATCH v2 0/2] Add APNE PCMCIA 100 Mbit support Michael Schmitz
2021-06-10  2:09                         ` [PATCH v2 1/2] m68k: io_mm.h - add APNE 100 MBit support Michael Schmitz
2021-06-10  2:09                         ` [PATCH v2 2/2] net/8390: apne.c - add 100 Mbit support to apne.c driver Michael Schmitz
2021-06-16 21:11                         ` [PATCH v2 0/2] Add APNE PCMCIA 100 Mbit support ALeX Kazik
2021-06-17  1:10                           ` Michael Schmitz
2021-06-04  7:54         ` [PATCH RFC 1/2] m68k: io_mm.h: conditionalize ISA address translation on Atari Geert Uytterhoeven
2021-06-04 21:36           ` Michael Schmitz
2021-06-04 23:31             ` Finn Thain
2021-06-05  0:24               ` Finn Thain
2021-06-05  3:48               ` Michael Schmitz
2021-06-09  6:35     ` Geert Uytterhoeven
2021-06-09  7:20       ` Michael Schmitz
2021-06-02  5:21   ` [PATCH RFC 2/2] m68k: setup_mm.c: set isa_sex for Atari if ATARI_ROM_ISA not used Michael Schmitz
2021-06-02  7:09     ` Geert Uytterhoeven
2021-06-02  8:21       ` Michael Schmitz
2021-06-03  8:29         ` Finn Thain
2021-06-04  3:02           ` Michael Schmitz
2021-06-06  5:28   ` [PATCH] m68k: Fix multiplatform ISA support Michael Schmitz
2021-06-07  7:49     ` Geert Uytterhoeven
2021-06-07  8:17       ` Michael Schmitz
2021-06-09  7:22     ` Michael Schmitz [this message]
2021-06-09  7:57       ` [PATCH v2] m68k: io_mm.h: conditionalize ISA address translation on Atari Andreas Schwab
2021-06-09 21:43         ` Michael Schmitz
2021-06-10  2:04       ` [PATCH v3] " Michael Schmitz

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