Import of Linux/MIPS 1.3.0

1 files changed, 290 insertions, 0 deletions

diff --git a/include/asm-alpha/jensen.h b/include/asm-alpha/jensen.h
new file mode 100644
index 000000000..952d56375
--- /dev/null
+++ b/include/asm-alpha/jensen.h
@@ -0,0 +1,290 @@
+#ifndef __ALPHA_JENSEN_H
+#define __ALPHA_JENSEN_H
+
+/*
+ * Defines for the AlphaPC EISA IO and memory address space.
+ */
+
+/*
+ * NOTE! 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).
+ */
+
+/*
+ * 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)
+
+/*
+ * Change virtual addresses to bus addresses and vv.
+ *
+ * NOTE! On the Jensen, the physical address is the same
+ * as the bus address, but this is not necessarily true on
+ * other alpha hardware.
+ */
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+
+#define HAE_ADDRESS	EISA_HAE
+
+/*
+ * Handle the "host address register". This needs to be set
+ * to the high 7 bits of the EISA address.  This is also needed
+ * for EISA IO addresses, which are only 16 bits wide (the
+ * hae needs to be set to 0).
+ *
+ * HAE isn't needed for the local IO operations, though.
+ */
+#define __HAE_MASK 0x1ffffff
+extern inline void __set_hae(unsigned long addr)
+{
+	/* hae on the Jensen is bits 31:25 shifted right */
+	addr >>= 25;
+	if (addr != hae.cache)
+		set_hae(addr);
+}
+
+/*
+ * 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..
+ *
+ * The local stuff makes for some complications, but it seems to be
+ * gone in the PCI version. I hope I can get DEC suckered^H^H^H^H^H^H^H^H
+ * convinced that I need one of the newer machines.
+ */
+extern inline unsigned int __local_inb(unsigned long addr)
+{
+	long result = *(volatile int *) ((addr << 9) + EISA_VL82C106);
+	return 0xffUL & result;
+}
+
+extern inline void __local_outb(unsigned char b, unsigned long addr)
+{
+	*(volatile unsigned int *) ((addr << 9) + EISA_VL82C106) = b;
+	mb();
+}
+
+extern unsigned int __bus_inb(unsigned long addr);
+extern inline unsigned int ___bus_inb(unsigned long addr)
+{
+	long result;
+
+	__set_hae(0);
+	result = *(volatile int *) ((addr << 7) + EISA_IO + 0x00);
+	result >>= (addr & 3) * 8;
+	return 0xffUL & result;
+}
+
+extern void __bus_outb(unsigned char b, unsigned long addr);
+extern inline void ___bus_outb(unsigned char b, unsigned long addr)
+{
+	__set_hae(0);
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x00) = b * 0x01010101;
+	mb();
+}
+
+/*
+ * It seems gcc is not very good at optimizing away logical
+ * operations that result in operations across inline functions.
+ * Which is why this is a macro.
+ */
+#define __is_local(addr) ( \
+/* keyboard */	(addr == 0x60 || addr == 0x64) || \
+/* RTC */	(addr == 0x170 || addr == 0x171) || \
+/* mb COM2 */	(addr >= 0x2f8 && addr <= 0x2ff) || \
+/* mb LPT1 */	(addr >= 0x3bc && addr <= 0x3be) || \
+/* mb COM2 */	(addr >= 0x3f8 && addr <= 0x3ff))
+
+extern inline unsigned int __inb(unsigned long addr)
+{
+	if (__is_local(addr))
+		return __local_inb(addr);
+	return __bus_inb(addr);
+}
+
+extern inline void __outb(unsigned char b, unsigned long addr)
+{
+	if (__is_local(addr))
+		__local_outb(b, addr);
+	else
+		__bus_outb(b, addr);
+}
+
+extern inline unsigned int __inw(unsigned long addr)
+{
+	long result;
+
+	__set_hae(0);
+	result = *(volatile int *) ((addr << 7) + EISA_IO + 0x20);
+	result >>= (addr & 3) * 8;
+	return 0xffffUL & result;
+}
+
+extern inline unsigned int __inl(unsigned long addr)
+{
+	__set_hae(0);
+	return *(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x60);
+}
+
+extern inline void __outw(unsigned short b, unsigned long addr)
+{
+	__set_hae(0);
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x20) = b * 0x00010001;
+	mb();
+}
+
+extern inline void __outl(unsigned int b, unsigned long addr)
+{
+	__set_hae(0);
+	*(volatile unsigned int *) ((addr << 7) + EISA_IO + 0x60) = b;
+	mb();
+}
+
+/*
+ * Memory functions.
+ */
+extern inline unsigned long __readb(unsigned long addr)
+{
+	long result;
+
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	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;
+
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	result = *(volatile int *) ((addr << 7) + EISA_MEM + 0x20);
+	result >>= (addr & 3) * 8;
+	return 0xffffUL & result;
+}
+
+extern inline unsigned long __readl(unsigned long addr)
+{
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	return *(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x60);
+}
+
+extern inline void __writeb(unsigned short b, unsigned long addr)
+{
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x00) = b * 0x01010101;
+}
+
+extern inline void __writew(unsigned short b, unsigned long addr)
+{
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x20) = b * 0x00010001;
+}
+
+extern inline void __writel(unsigned int b, unsigned long addr)
+{
+	__set_hae(addr);
+	addr &= __HAE_MASK;
+	*(volatile unsigned int *) ((addr << 7) + EISA_MEM + 0x60) = b;
+}
+
+/*
+ * The above have so much overhead that it probably doesn't make
+ * sense to have them inlined (better icache behaviour).
+ */
+extern unsigned int inb(unsigned long addr);
+extern unsigned int inw(unsigned long addr);
+extern unsigned int inl(unsigned long addr);
+
+extern void outb(unsigned char b, unsigned long addr);
+extern void outw(unsigned short b, unsigned long addr);
+extern void outl(unsigned int b, unsigned long addr);
+
+extern unsigned long readb(unsigned long addr);
+extern unsigned long readw(unsigned long addr);
+extern unsigned long readl(unsigned long addr);
+
+extern void writeb(unsigned short b, unsigned long addr);
+extern void writew(unsigned short b, unsigned long addr);
+extern void writel(unsigned int b, unsigned long addr);
+
+#define inb(port) \
+(__builtin_constant_p((port))?__inb(port):(inb)(port))
+
+#define outb(x, port) \
+(__builtin_constant_p((port))?__outb((x),(port)):(outb)((x),(port)))
+
+#define inb_p inb
+#define outb_p outb
+
+/*
+ * The Alpha Jensen hardware for some rather strange reason puts
+ * the RTC clock at 0x170 instead of 0x70. Probably due to some
+ * misguided idea about using 0x70 for NMI stuff.
+ *
+ * These defines will override the defaults when doing RTC queries
+ */
+#define RTC_PORT(x)	(0x170+(x))
+#define RTC_ADDR(x)	(x)
+#define RTC_ALWAYS_BCD	0
+
+#endif