--- /dev/null
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 22-Oct-00
+ */
+
+#include <common.h>
+#include <command.h>
+#include <mpc8260.h>
+#include <mpc8260_irq.h>
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/****************************************************************************/
+
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ ulong count;
+};
+
+static struct irq_action irq_handlers[NR_IRQS];
+
+static ulong ppc_cached_irq_mask[NR_MASK_WORDS];
+
+/****************************************************************************/
+/* this section was ripped out of arch/powerpc/kernel/ppc8260_pic.c in the */
+/* Linux/PPC 2.4.x source. There was no copyright notice in that file. */
+
+/* The 8260 internal interrupt controller. It is usually
+ * the only interrupt controller.
+ * There are two 32-bit registers (high/low) for up to 64
+ * possible interrupts.
+ *
+ * Now, the fun starts.....Interrupt Numbers DO NOT MAP
+ * in a simple arithmetic fashion to mask or pending registers.
+ * That is, interrupt 4 does not map to bit position 4.
+ * We create two tables, indexed by vector number, to indicate
+ * which register to use and which bit in the register to use.
+ */
+static u_char irq_to_siureg[] = {
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+static u_char irq_to_siubit[] = {
+ 31, 16, 17, 18, 19, 20, 21, 22,
+ 23, 24, 25, 26, 27, 28, 29, 30,
+ 29, 30, 16, 17, 18, 19, 20, 21,
+ 22, 23, 24, 25, 26, 27, 28, 31,
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 15, 14, 13, 12, 11, 10, 9, 8,
+ 7, 6, 5, 4, 3, 2, 1, 0
+};
+
+static void m8260_mask_irq (unsigned int irq_nr)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+ int bit, word;
+ volatile uint *simr;
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ simr = &(immr->im_intctl.ic_simrh);
+ ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
+ simr[word] = ppc_cached_irq_mask[word];
+}
+
+static void m8260_unmask_irq (unsigned int irq_nr)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+ int bit, word;
+ volatile uint *simr;
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ simr = &(immr->im_intctl.ic_simrh);
+ ppc_cached_irq_mask[word] |= (1 << (31 - bit));
+ simr[word] = ppc_cached_irq_mask[word];
+}
+
+static void m8260_mask_and_ack (unsigned int irq_nr)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+ int bit, word;
+ volatile uint *simr, *sipnr;
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ simr = &(immr->im_intctl.ic_simrh);
+ sipnr = &(immr->im_intctl.ic_sipnrh);
+ ppc_cached_irq_mask[word] &= ~(1 << (31 - bit));
+ simr[word] = ppc_cached_irq_mask[word];
+ sipnr[word] = 1 << (31 - bit);
+}
+
+static int m8260_get_irq (struct pt_regs *regs)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+ int irq;
+ unsigned long bits;
+
+ /* For MPC8260, read the SIVEC register and shift the bits down
+ * to get the irq number. */
+ bits = immr->im_intctl.ic_sivec;
+ irq = bits >> 26;
+ return irq;
+}
+
+/* end of code ripped out of arch/powerpc/kernel/ppc8260_pic.c */
+/****************************************************************************/
+
+int interrupt_init_cpu (unsigned *decrementer_count)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+
+ *decrementer_count = (gd->bus_clk / 4) / CONFIG_SYS_HZ;
+
+ /* Initialize the default interrupt mapping priorities */
+ immr->im_intctl.ic_sicr = 0;
+ immr->im_intctl.ic_siprr = 0x05309770;
+ immr->im_intctl.ic_scprrh = 0x05309770;
+ immr->im_intctl.ic_scprrl = 0x05309770;
+
+ /* disable all interrupts and clear all pending bits */
+ immr->im_intctl.ic_simrh = ppc_cached_irq_mask[0] = 0;
+ immr->im_intctl.ic_simrl = ppc_cached_irq_mask[1] = 0;
+ immr->im_intctl.ic_sipnrh = 0xffffffff;
+ immr->im_intctl.ic_sipnrl = 0xffffffff;
+
+#ifdef CONFIG_HYMOD
+ /*
+ * ensure all external interrupt sources default to trigger on
+ * high-to-low transition (i.e. edge triggered active low)
+ */
+ immr->im_intctl.ic_siexr = -1;
+#endif
+
+ return (0);
+}
+
+/****************************************************************************/
+
+/*
+ * Handle external interrupts
+ */
+void external_interrupt (struct pt_regs *regs)
+{
+ int irq, unmask = 1;
+
+ irq = m8260_get_irq (regs);
+
+ m8260_mask_and_ack (irq);
+
+ enable_interrupts ();
+
+ if (irq_handlers[irq].handler != NULL)
+ (*irq_handlers[irq].handler) (irq_handlers[irq].arg);
+ else {
+ printf ("\nBogus External Interrupt IRQ %d\n", irq);
+ /*
+ * turn off the bogus interrupt, otherwise it
+ * might repeat forever
+ */
+ unmask = 0;
+ }
+
+ if (unmask)
+ m8260_unmask_irq (irq);
+}
+
+/****************************************************************************/
+
+/*
+ * Install and free an interrupt handler.
+ */
+
+void
+irq_install_handler (int irq, interrupt_handler_t * handler, void *arg)
+{
+ if (irq < 0 || irq >= NR_IRQS) {
+ printf ("irq_install_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ if (irq_handlers[irq].handler != NULL)
+ printf ("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
+ (ulong) handler, (ulong) irq_handlers[irq].handler);
+
+ irq_handlers[irq].handler = handler;
+ irq_handlers[irq].arg = arg;
+
+ m8260_unmask_irq (irq);
+}
+
+void irq_free_handler (int irq)
+{
+ if (irq < 0 || irq >= NR_IRQS) {
+ printf ("irq_free_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ m8260_mask_irq (irq);
+
+ irq_handlers[irq].handler = NULL;
+ irq_handlers[irq].arg = NULL;
+}
+
+/****************************************************************************/
+
+void timer_interrupt_cpu (struct pt_regs *regs)
+{
+ /* nothing to do here */
+ return;
+}
+
+/****************************************************************************/
+
+#if defined(CONFIG_CMD_IRQ)
+
+/* ripped this out of ppc4xx/interrupts.c */
+
+/*******************************************************************************
+*
+* irqinfo - print information about PCI devices
+*
+*/
+void
+do_irqinfo (cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
+{
+ int irq, re_enable;
+
+ re_enable = disable_interrupts ();
+
+ puts ("\nInterrupt-Information:\n"
+ "Nr Routine Arg Count\n");
+
+ for (irq = 0; irq < 32; irq++)
+ if (irq_handlers[irq].handler != NULL)
+ printf ("%02d %08lx %08lx %ld\n", irq,
+ (ulong) irq_handlers[irq].handler,
+ (ulong) irq_handlers[irq].arg,
+ irq_handlers[irq].count);
+
+ if (re_enable)
+ enable_interrupts ();
+}
+
+#endif
Code Review / kvmfornfv.git / blobdiff