Import of Linus's Linux 1.1.68

1 files changed, 179 insertions, 0 deletions

diff --git a/include/asm-alpha/io.h b/include/asm-alpha/io.h
new file mode 100644
index 000000000..969fc96d8
--- /dev/null
+++ b/include/asm-alpha/io.h
@@ -0,0 +1,179 @@
+#ifndef __ALPHA_IO_H
+#define __ALPHA_IO_H
+
+/*
+ * Defines for the AlphaPC EISA IO and memory address space.
+ */
+
+#ifndef mb
+#define mb() __asm__ __volatile__("mb": : :"memory")
+#endif
+
+/*
+ * NOTE! Currently it never uses the HAE register, so these work only
+ * for the low 25 bits of EISA addressing.  That covers all of the IO
+ * address space (16 bits), and most of the "normal" EISA memory space.
+ * I'll fix it eventually, but I'll need to come up with a clean way
+ * to handle races with interrupt services wanting to change HAE...
+ */
+
+/*
+ * NOTE 2! The memory operations do not set any memory barriers, as it's
+ * not needed for cases like a frame buffer that is essentially memory-like.
+ * You need to do them by hand if the operations depend on ordering.
+ *
+ * Similarly, the port IO operations do a "mb" only after a write operation:
+ * if an mb is needed before (as in the case of doing memory mapped IO
+ * first, and then a port IO operation to the same device), it needs to be
+ * done by hand.
+ *
+ * After the above has bitten me 100 times, I'll give up and just do the
+ * mb all the time, but right now I'm hoping this will work out.  Avoiding
+ * mb's may potentially be a noticeable speed improvement, but I can't
+ * honestly say I've tested it.
+ *
+ * Handling interrupts that need to do mb's to synchronize to non-interrupts
+ * is another fun race area.  Don't do it (because if you do, I'll have to
+ * do *everything* with interrupts disabled, ugh).
+ */
+
+/*
+ * Virtual -> physical identity mapping starts at this offset
+ */
+#define IDENT_ADDR	(0xfffffc0000000000UL)
+
+/*
+ * EISA Interrupt Acknowledge address
+ */
+#define EISA_INTA		(IDENT_ADDR + 0x100000000UL)
+
+/*
+ * FEPROM addresses
+ */
+#define EISA_FEPROM0		(IDENT_ADDR + 0x180000000UL)
+#define EISA_FEPROM1		(IDENT_ADDR + 0x1A0000000UL)
+
+/*
+ * VL82C106 base address
+ */
+#define EISA_VL82C106		(IDENT_ADDR + 0x1C0000000UL)
+
+/*
+ * EISA "Host Address Extension" address (bits 25-31 of the EISA address)
+ */
+#define EISA_HAE		(IDENT_ADDR + 0x1D0000000UL)
+
+/*
+ * "SYSCTL" register address
+ */
+#define EISA_SYSCTL		(IDENT_ADDR + 0x1E0000000UL)
+
+/*
+ * "spare" register address
+ */
+#define EISA_SPARE		(IDENT_ADDR + 0x1F0000000UL)
+
+/*
+ * EISA memory address offset
+ */
+#define EISA_MEM		(IDENT_ADDR + 0x200000000UL)
+
+/*
+ * EISA IO address offset
+ */
+#define EISA_IO			(IDENT_ADDR + 0x300000000UL)
+
+/*
+ * IO functions
+ *
+ * The "local" functions are those that don't go out to the EISA bus,
+ * but instead act on the VL82C106 chip directly.. This is mainly the
+ * keyboard, RTC,  printer and first two serial lines..
+ */
+extern inline unsigned long inb_local(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 9) + EISA_VL82C106);
+	return 0xffUL & result;
+}
+
+extern inline void outb_local(unsigned char b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 9) + EISA_VL82C106) = b;
+	mb();
+}
+
+extern inline unsigned long inb(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 7) + EISA_IO + 0x00);
+	result >>= (addr & 3) * 8;
+	return 0xffUL & result;
+}
+
+extern inline unsigned long inw(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 7) + EISA_IO + 0x20);
+	result >>= (addr & 3) * 8;
+	return 0xffffUL & result;
+}
+
+extern inline unsigned long inl(unsigned long addr)
+{
+	return *(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x60);
+}
+
+extern inline void outb(unsigned char b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x00) = b * 0x01010101;
+	mb();
+}
+
+extern inline void outw(unsigned short b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x20) = b * 0x00010001;
+	mb();
+}
+
+extern inline void outl(unsigned int b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x60) = b;
+	mb();
+}
+
+/*
+ * Memory functions
+ */
+extern inline unsigned long readb(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x00);
+	result >>= (addr & 3) * 8;
+	return 0xffUL & result;
+}
+
+extern inline unsigned long readw(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x20);
+	result >>= (addr & 3) * 8;
+	return 0xffffUL & result;
+}
+
+extern inline unsigned long readl(unsigned long addr)
+{
+	return *(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x60);
+}
+
+extern inline void writeb(unsigned short b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x00) = b * 0x01010101;
+}
+
+extern inline void writew(unsigned short b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x20) = b * 0x00010001;
+}
+
+extern inline void writel(unsigned int b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x60) = b;
+}
+
+#endif