* Patch by Thomas Frieden, 13 Nov 2002:

  Add code for AmigaOne board
  (preliminary merge to U-Boot, still WIP)

* Patch by Jon Diekema, 12 Nov 2002:
  - Adding URL for IEEE OUI lookup
  - Making the autoboot #defines dependent on CONFIG_AUTOBOOT_KEYED
    being defined.
  - In the CONFIG_EXTRA_ENV_SETTINGS #define, the root-on-initrd and
    root-on-nfs macros are designed to switch how the default boot
    method gets defined.

1 files changed, 230 insertions, 0 deletions

diff --git a/board/MAI/AmigaOneG3SE/i8259.c b/board/MAI/AmigaOneG3SE/i8259.c
new file mode 100644
index 0000000..6cdfc60
--- /dev/null
+++ b/board/MAI/AmigaOneG3SE/i8259.c
@@ -0,0 +1,230 @@
+/*
+ * (C) Copyright 2002
+ * John W. Linville, linville@tuxdriver.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include "i8259.h"
+
+#undef  IRQ_DEBUG
+
+#ifdef  IRQ_DEBUG
+#define PRINTF(fmt,args...)     printf (fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+
+static inline unsigned char read_byte(volatile unsigned char* from)
+{
+    int x;
+    asm volatile ("lbz %0,%1\n eieio" : "=r" (x) : "m" (*from));
+    return (unsigned char)x;
+}
+
+static inline void write_byte(volatile unsigned char *to, int x)
+{
+    asm volatile ("stb %1,%0\n eieio" : "=m" (*to) : "r" (x));
+}
+
+static inline unsigned long read_long_little(volatile unsigned long *from)
+{
+    unsigned long x;
+    asm volatile ("lwbrx %0,0,%1\n eieio\n sync" : "=r" (x) : "r" (from), "m"(*from));
+    return (unsigned long)x;
+}
+
+#ifdef out8
+#undef out8
+#endif
+
+#ifdef in8
+#undef in8
+#endif
+
+#define out8(addr, byte) write_byte(0xFE000000 | addr, byte)
+#define in8(addr) read_byte(0xFE000000 | addr)
+
+/*
+ * This contains the irq mask for both 8259A irq controllers,
+ */
+static char cached_imr[2] = {0xff, 0xff};
+
+#define cached_imr1	(cached_imr[0])
+#define cached_imr2	(cached_imr[1])
+
+void i8259_init(void)
+{
+	char dummy;
+	PRINTF("Initializing Interrupt controller\n");
+	/* init master interrupt controller */
+	out8(0x20, 0x11); //0x19); // was: 0x11); /* Start init sequence */
+	out8(0x21, 0x00); /* Vector base */
+	out8(0x21, 0x04); /* edge tiggered, Cascade (slave) on IRQ2 */
+	out8(0x21, 0x11); // was: 0x01); /* Select 8086 mode */
+
+	/* init slave interrupt controller */
+	out8(0xA0, 0x11); //0x19); // was: 0x11); /* Start init sequence */
+	out8(0xA1, 0x08); /* Vector base */
+	out8(0xA1, 0x02); /* edge triggered, Cascade (slave) on IRQ2 */
+	out8(0xA1, 0x11); // was: 0x01); /* Select 8086 mode */
+
+	/* always read ISR */
+	out8(0x20, 0x0B);
+	dummy = in8(ISR_1);
+	out8(0xA0, 0x0B);
+	dummy = in8(ISR_2);
+
+/*     out8(0x43, 0x30); */
+/*     out8(0x40, 0); */
+/*     out8(0x40, 0); */
+/*     out8(0x43, 0x70); */
+/*     out8(0x41, 0); */
+/*     out8(0x41, 0); */
+/*     out8(0x43, 0xb0); */
+/*     out8(0x42, 0); */
+/*     out8(0x42, 0); */
+
+	/* Mask all interrupts */
+	out8(IMR_2, cached_imr2);
+	out8(IMR_1, cached_imr1);
+
+	i8259_unmask_irq(2);
+#if 0
+	{
+	    int i;
+	    for (i=0; i<16; i++)
+	    {
+		i8259_unmask_irq(i);
+	    }
+	}
+#endif
+}
+
+static volatile char *pci_intack = (void *)0xFEF00000;
+
+int i8259_irq(void)
+{
+	int irq;
+
+	irq = read_long_little(pci_intack) & 0xff;
+	if (irq==7) {
+		/*
+		 * This may be a spurious interrupt.
+		 *
+		 * Read the interrupt status register (ISR). If the most
+		 * significant bit is not set then there is no valid
+		 * interrupt.
+		 */
+		if(~in8(0x20)&0x80) {
+			irq = -1;
+		}
+	}
+
+	return irq;
+}
+int i8259_get_irq(struct pt_regs *regs)
+{
+	unsigned char irq;
+
+	/*
+	 * Perform an interrupt acknowledge cycle on controller 1
+	 */
+	out8(OCW3_1, 0x0C); /* prepare for poll */
+	irq = in8(IPL_1) & 7;
+	if (irq == 2) {
+		/*
+		 * Interrupt is cascaded so perform interrupt
+		 * acknowledge on controller 2
+		 */
+		out8(OCW3_2, 0x0C); /* prepare for poll */
+		irq = (in8(IPL_2) & 7) + 8;
+		if (irq == 15) {
+			/*
+			 * This may be a spurious interrupt
+			 *
+			 * Read the interrupt status register. If the most
+			 * significant bit is not set then there is no valid
+			 * interrupt
+			 */
+			out8(OCW3_2, 0x0b);
+			if (~(in8(ISR_2) & 0x80)) {
+				return -1;
+			}
+		}
+	} else if (irq == 7) {
+		/*
+		 * This may be a spurious interrupt
+		 *
+		 * Read the interrupt status register. If the most
+		 * significant bit is not set then there is no valid
+		 * interrupt
+		 */
+		out8(OCW3_1, 0x0b);
+		if (~(in8(ISR_1) & 0x80)) {
+			return -1;
+		}
+	}
+	return irq;
+}
+
+/*
+ * Careful! The 8259A is a fragile beast, it pretty
+ * much _has_ to be done exactly like this (mask it
+ * first, _then_ send the EOI, and the order of EOI
+ * to the two 8259s is important!
+ */
+void i8259_mask_and_ack(int irq)
+{
+	if (irq > 7) {
+		cached_imr2 |= (1 << (irq - 8));
+		in8(IMR_2); /* DUMMY */
+		out8(IMR_2, cached_imr2);
+		out8(OCW2_2, 0x20); /* Non-specific EOI */
+		out8(OCW2_1, 0x20); /* Non-specific EOI to cascade */
+	} else {
+		cached_imr1 |= (1 << irq);
+		in8(IMR_1); /* DUMMY */
+		out8(IMR_1, cached_imr1);
+		out8(OCW2_1, 0x20); /* Non-specific EOI */
+	}
+}
+
+void i8259_mask_irq(int irq)
+{
+	if (irq & 8) {
+		cached_imr2 |= (1 << (irq & 7));
+		out8(IMR_2, cached_imr2);
+	} else {
+		cached_imr1 |= (1 << irq);
+		out8(IMR_1, cached_imr1);
+	}
+}
+
+void i8259_unmask_irq(int irq)
+{
+	if (irq & 8) {
+		cached_imr2 &= ~(1 << (irq & 7));
+		out8(IMR_2, cached_imr2);
+	} else {
+		cached_imr1 &= ~(1 << irq);
+		out8(IMR_1, cached_imr1);
+	}
+}