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authorwdenk <wdenk>2002-11-19 11:04:11 +0000
committerwdenk <wdenk>2002-11-19 11:04:11 +0000
commitc7de829c796978e519984df2f1c8cfcf921a39a4 (patch)
tree43e42aa9a09f5265783c1622a5cea080471ef50e /board/MAI/AmigaOneG3SE/i8259.c
parent2262cfeef91458b01a1bfe3812ccbbfdf8b82807 (diff)
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* 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.
Diffstat (limited to 'board/MAI/AmigaOneG3SE/i8259.c')
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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
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+++ b/board/MAI/AmigaOneG3SE/i8259.c
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+/*
+ * (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);
+ }
+}