m68k/atari: ROM port ISA adapter support

Atari ROM port ISA adapter support for EtherNEC and NetUSBee adapters

16 bit access for ROM port adapters follows debugging and
clarification by David Galvez <dgalvez75@gmail.com>. The NetUSBee
ISP1160 USB chip uses these macros.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 108 insertions, 1 deletions

diff --git a/arch/m68k/include/asm/raw_io.h b/arch/m68k/include/asm/raw_io.h
index d9eb9834ccc8..932faa35655b 100644
--- a/arch/m68k/include/asm/raw_io.h
+++ b/arch/m68k/include/asm/raw_io.h
@@ -10,7 +10,7 @@
 
 #ifdef __KERNEL__
 
-#include <asm/types.h>
+#include <asm/byteorder.h>
 
 
 /* Values for nocacheflag and cmode */
@@ -60,6 +60,57 @@ extern void __iounmap(void *addr, unsigned long size);
 #define __raw_writew(val,addr) out_be16((addr),(val))
 #define __raw_writel(val,addr) out_be32((addr),(val))
 
+/*
+ * Atari ROM port (cartridge port) ISA adapter, used for the EtherNEC NE2000
+ * network card driver.
+ * The ISA adapter connects address lines A9-A13 to ISA address lines A0-A4,
+ * and hardwires the rest of the ISA addresses for a base address of 0x300.
+ *
+ * Data lines D8-D15 are connected to ISA data lines D0-D7 for reading.
+ * For writes, address lines A1-A8 are latched to ISA data lines D0-D7
+ * (meaning the bit pattern on A1-A8 can be read back as byte).
+ *
+ * Read and write operations are distinguished by the base address used:
+ * reads are from the ROM A side range, writes are through the B side range
+ * addresses (A side base + 0x10000).
+ *
+ * Reads and writes are byte only.
+ *
+ * 16 bit reads and writes are necessary for the NetUSBee adapter's USB
+ * chipset - 16 bit words are read straight off the ROM port while 16 bit
+ * reads are split into two byte writes. The low byte is latched to the
+ * NetUSBee buffer by a read from the _read_ window (with the data pattern
+ * asserted as A1-A8 address pattern). The high byte is then written to the
+ * write range as usual, completing the write cycle.
+ */
+
+#if defined(CONFIG_ATARI_ROM_ISA)
+#define rom_in_8(addr) \
+	({ u16 __v = (*(__force volatile u16 *) (addr)); __v >>= 8; __v; })
+#define rom_in_be16(addr) \
+	({ u16 __v = (*(__force volatile u16 *) (addr)); __v; })
+#define rom_in_le16(addr) \
+	({ u16 __v = le16_to_cpu(*(__force volatile u16 *) (addr)); __v; })
+
+#define rom_out_8(addr, b)	\
+	({u8 __w, __v = (b);  u32 _addr = ((u32) (addr)); \
+	__w = ((*(__force volatile u8 *)  ((_addr | 0x10000) + (__v<<1)))); })
+#define rom_out_be16(addr, w)	\
+	({u16 __w, __v = (w); u32 _addr = ((u32) (addr)); \
+	__w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v & 0xFF)<<1)))); \
+	__w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v >> 8)<<1)))); })
+#define rom_out_le16(addr, w)	\
+	({u16 __w, __v = (w); u32 _addr = ((u32) (addr)); \
+	__w = ((*(__force volatile u16 *) ((_addr & 0xFFFF0000UL) + ((__v >> 8)<<1)))); \
+	__w = ((*(__force volatile u16 *) ((_addr | 0x10000) + ((__v & 0xFF)<<1)))); })
+
+#define raw_rom_inb rom_in_8
+#define raw_rom_inw rom_in_be16
+
+#define raw_rom_outb(val, port) rom_out_8((port), (val))
+#define raw_rom_outw(val, port) rom_out_be16((port), (val))
+#endif /* CONFIG_ATARI_ROM_ISA */
+
 static inline void raw_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
 {
 	unsigned int i;
@@ -342,6 +393,62 @@ static inline void raw_outsw_swapw(volatile u16 __iomem *port, const u16 *buf,
 		: "d0", "a0", "a1", "d6");
 }
 
+
+#if defined(CONFIG_ATARI_ROM_ISA)
+static inline void raw_rom_insb(volatile u8 __iomem *port, u8 *buf, unsigned int len)
+{
+	unsigned int i;
+
+	for (i = 0; i < len; i++)
+		*buf++ = rom_in_8(port);
+}
+
+static inline void raw_rom_outsb(volatile u8 __iomem *port, const u8 *buf,
+			     unsigned int len)
+{
+	unsigned int i;
+
+	for (i = 0; i < len; i++)
+		rom_out_8(port, *buf++);
+}
+
+static inline void raw_rom_insw(volatile u16 __iomem *port, u16 *buf,
+				   unsigned int nr)
+{
+	unsigned int i;
+
+	for (i = 0; i < nr; i++)
+		*buf++ = rom_in_be16(port);
+}
+
+static inline void raw_rom_outsw(volatile u16 __iomem *port, const u16 *buf,
+				   unsigned int nr)
+{
+	unsigned int i;
+
+	for (i = 0; i < nr; i++)
+		rom_out_be16(port, *buf++);
+}
+
+static inline void raw_rom_insw_swapw(volatile u16 __iomem *port, u16 *buf,
+				   unsigned int nr)
+{
+	unsigned int i;
+
+	for (i = 0; i < nr; i++)
+		*buf++ = rom_in_le16(port);
+}
+
+static inline void raw_rom_outsw_swapw(volatile u16 __iomem *port, const u16 *buf,
+				   unsigned int nr)
+{
+	unsigned int i;
+
+	for (i = 0; i < nr; i++)
+		rom_out_le16(port, *buf++);
+}
+#endif /* CONFIG_ATARI_ROM_ISA */
+
 #endif /* __KERNEL__ */
 
 #endif /* _RAW_IO_H */