Added interrupt handling capabilities for mpc5xxx processors.
Also added Linux like BUG() macros.
diff --git a/cpu/mpc5xxx/interrupts.c b/cpu/mpc5xxx/interrupts.c
index 7bacecd..7b5cb8b 100644
--- a/cpu/mpc5xxx/interrupts.c
+++ b/cpu/mpc5xxx/interrupts.c
@@ -1,4 +1,7 @@
/*
+ * (C) Copyright 2006
+ * Detlev Zundel, DENX Software Engineering, dzu@denx.de
+ *
* (C) Copyright -2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
@@ -24,18 +27,212 @@
* MA 02111-1307 USA
*/
-/*
- * interrupts.c - just enough support for the decrementer/timer
+/* this section was ripped out of arch/ppc/syslib/mpc52xx_pic.c in the
+ * Linux 2.6 source with the following copyright.
+ *
+ * Based on (well, mostly copied from) the code from the 2.4 kernel by
+ * Dale Farnsworth <dfarnsworth@mvista.com> and Kent Borg.
+ *
+ * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2003 Montavista Software, Inc
*/
#include <common.h>
#include <asm/processor.h>
+#include <asm/io.h>
#include <command.h>
-int interrupt_init_cpu (ulong *decrementer_count)
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ ulong count;
+};
+
+static struct irq_action irq_handlers[NR_IRQS];
+
+static struct mpc5xxx_intr *intr;
+static struct mpc5xxx_sdma *sdma;
+
+static void mpc5xxx_ic_disable(unsigned int irq)
+{
+ u32 val;
+
+ if (irq == MPC5XXX_IRQ0) {
+ val = in_be32(&intr->ctrl);
+ val &= ~(1 << 11);
+ out_be32(&intr->ctrl, val);
+ } else if (irq < MPC5XXX_IRQ1) {
+ BUG();
+ } else if (irq <= MPC5XXX_IRQ3) {
+ val = in_be32(&intr->ctrl);
+ val &= ~(1 << (10 - (irq - MPC5XXX_IRQ1)));
+ out_be32(&intr->ctrl, val);
+ } else if (irq < MPC5XXX_SDMA_IRQ_BASE) {
+ val = in_be32(&intr->main_mask);
+ val |= 1 << (16 - (irq - MPC5XXX_MAIN_IRQ_BASE));
+ out_be32(&intr->main_mask, val);
+ } else if (irq < MPC5XXX_PERP_IRQ_BASE) {
+ val = in_be32(&sdma->IntMask);
+ val |= 1 << (irq - MPC5XXX_SDMA_IRQ_BASE);
+ out_be32(&sdma->IntMask, val);
+ } else {
+ val = in_be32(&intr->per_mask);
+ val |= 1 << (31 - (irq - MPC5XXX_PERP_IRQ_BASE));
+ out_be32(&intr->per_mask, val);
+ }
+}
+
+static void mpc5xxx_ic_enable(unsigned int irq)
+{
+ u32 val;
+
+ if (irq == MPC5XXX_IRQ0) {
+ val = in_be32(&intr->ctrl);
+ val |= 1 << 11;
+ out_be32(&intr->ctrl, val);
+ } else if (irq < MPC5XXX_IRQ1) {
+ BUG();
+ } else if (irq <= MPC5XXX_IRQ3) {
+ val = in_be32(&intr->ctrl);
+ val |= 1 << (10 - (irq - MPC5XXX_IRQ1));
+ out_be32(&intr->ctrl, val);
+ } else if (irq < MPC5XXX_SDMA_IRQ_BASE) {
+ val = in_be32(&intr->main_mask);
+ val &= ~(1 << (16 - (irq - MPC5XXX_MAIN_IRQ_BASE)));
+ out_be32(&intr->main_mask, val);
+ } else if (irq < MPC5XXX_PERP_IRQ_BASE) {
+ val = in_be32(&sdma->IntMask);
+ val &= ~(1 << (irq - MPC5XXX_SDMA_IRQ_BASE));
+ out_be32(&sdma->IntMask, val);
+ } else {
+ val = in_be32(&intr->per_mask);
+ val &= ~(1 << (31 - (irq - MPC5XXX_PERP_IRQ_BASE)));
+ out_be32(&intr->per_mask, val);
+ }
+}
+
+static void mpc5xxx_ic_ack(unsigned int irq)
+{
+ u32 val;
+
+ /*
+ * Only some irqs are reset here, others in interrupting hardware.
+ */
+
+ switch (irq) {
+ case MPC5XXX_IRQ0:
+ val = in_be32(&intr->ctrl);
+ val |= 0x08000000;
+ out_be32(&intr->ctrl, val);
+ break;
+ case MPC5XXX_CCS_IRQ:
+ val = in_be32(&intr->enc_status);
+ val |= 0x00000400;
+ out_be32(&intr->enc_status, val);
+ break;
+ case MPC5XXX_IRQ1:
+ val = in_be32(&intr->ctrl);
+ val |= 0x04000000;
+ out_be32(&intr->ctrl, val);
+ break;
+ case MPC5XXX_IRQ2:
+ val = in_be32(&intr->ctrl);
+ val |= 0x02000000;
+ out_be32(&intr->ctrl, val);
+ break;
+ case MPC5XXX_IRQ3:
+ val = in_be32(&intr->ctrl);
+ val |= 0x01000000;
+ out_be32(&intr->ctrl, val);
+ break;
+ default:
+ if (irq >= MPC5XXX_SDMA_IRQ_BASE
+ && irq < (MPC5XXX_SDMA_IRQ_BASE + MPC5XXX_SDMA_IRQ_NUM)) {
+ out_be32(&sdma->IntPend,
+ 1 << (irq - MPC5XXX_SDMA_IRQ_BASE));
+ }
+ break;
+ }
+}
+
+static void mpc5xxx_ic_disable_and_ack(unsigned int irq)
+{
+ mpc5xxx_ic_disable(irq);
+ mpc5xxx_ic_ack(irq);
+}
+
+static void mpc5xxx_ic_end(unsigned int irq)
+{
+ mpc5xxx_ic_enable(irq);
+}
+
+void mpc5xxx_init_irq(void)
+{
+ u32 intr_ctrl;
+
+ /* Remap the necessary zones */
+ intr = (struct mpc5xxx_intr *)(MPC5XXX_ICTL);
+ sdma = (struct mpc5xxx_sdma *)(MPC5XXX_SDMA);
+
+ /* Disable all interrupt sources. */
+ out_be32(&sdma->IntPend, 0xffffffff); /* 1 means clear pending */
+ out_be32(&sdma->IntMask, 0xffffffff); /* 1 means disabled */
+ out_be32(&intr->per_mask, 0x7ffffc00); /* 1 means disabled */
+ out_be32(&intr->main_mask, 0x00010fff); /* 1 means disabled */
+ intr_ctrl = in_be32(&intr->ctrl);
+ intr_ctrl |= 0x0f000000 | /* clear IRQ 0-3 */
+ 0x00ff0000 | /* IRQ 0-3 level sensitive low active */
+ 0x00001000 | /* MEE master external enable */
+ 0x00000000 | /* 0 means disable IRQ 0-3 */
+ 0x00000001; /* CEb route critical normally */
+ out_be32(&intr->ctrl, intr_ctrl);
+
+ /* Zero a bunch of the priority settings. */
+ out_be32(&intr->per_pri1, 0);
+ out_be32(&intr->per_pri2, 0);
+ out_be32(&intr->per_pri3, 0);
+ out_be32(&intr->main_pri1, 0);
+ out_be32(&intr->main_pri2, 0);
+}
+
+int mpc5xxx_get_irq(struct pt_regs *regs)
+{
+ u32 status;
+ int irq = -1;
+
+ status = in_be32(&intr->enc_status);
+
+ if (status & 0x00000400) { /* critical */
+ irq = (status >> 8) & 0x3;
+ if (irq == 2) /* high priority peripheral */
+ goto peripheral;
+ irq += MPC5XXX_CRIT_IRQ_BASE;
+ } else if (status & 0x00200000) { /* main */
+ irq = (status >> 16) & 0x1f;
+ if (irq == 4) /* low priority peripheral */
+ goto peripheral;
+ irq += MPC5XXX_MAIN_IRQ_BASE;
+ } else if (status & 0x20000000) { /* peripheral */
+ peripheral:
+ irq = (status >> 24) & 0x1f;
+ if (irq == 0) { /* bestcomm */
+ status = in_be32(&sdma->IntPend);
+ irq = ffs(status) + MPC5XXX_SDMA_IRQ_BASE - 1;
+ } else
+ irq += MPC5XXX_PERP_IRQ_BASE;
+ }
+
+ return irq;
+}
+
+/****************************************************************************/
+
+int interrupt_init_cpu(ulong * decrementer_count)
{
*decrementer_count = get_tbclk() / CFG_HZ;
+ mpc5xxx_init_irq();
+
return (0);
}
@@ -44,14 +241,32 @@
/*
* Handle external interrupts
*/
-void
-external_interrupt(struct pt_regs *regs)
+void external_interrupt(struct pt_regs *regs)
{
- puts("external_interrupt (oops!)\n");
+ int irq, unmask = 1;
+
+ irq = mpc5xxx_get_irq(regs);
+
+ mpc5xxx_ic_disable_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)
+ mpc5xxx_ic_end(irq);
}
-void
-timer_interrupt_cpu (struct pt_regs *regs)
+void timer_interrupt_cpu(struct pt_regs *regs)
{
/* nothing to do here */
return;
@@ -63,22 +278,69 @@
* Install and free a interrupt handler.
*/
-void
-irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
+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;
+
+ mpc5xxx_ic_enable(irq);
}
-void
-irq_free_handler(int vec)
+void irq_free_handler(int irq)
{
+ if (irq < 0 || irq >= NR_IRQS) {
+ printf("irq_free_handler: bad irq number %d\n", irq);
+ return;
+ }
+ mpc5xxx_ic_disable(irq);
+
+ irq_handlers[irq].handler = NULL;
+ irq_handlers[irq].arg = NULL;
}
/****************************************************************************/
-void
-do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
+#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
+void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char *argv[])
{
- puts("IRQ related functions are unimplemented currently.\n");
+ int irq, re_enable;
+ u32 intr_ctrl;
+ char *irq_config[] = { "level sensitive, active high",
+ "edge sensitive, rising active edge",
+ "edge sensitive, falling active edge",
+ "level sensitive, active low"
+ };
+
+ re_enable = disable_interrupts();
+
+ intr_ctrl = in_be32(&intr->ctrl);
+ printf("Interrupt configuration:\n");
+
+ for (irq = 0; irq <= 3; irq++) {
+ printf("IRQ%d: %s\n", irq,
+ irq_config[(intr_ctrl >> (22 - 2 * irq)) & 0x3]);
+ }
+
+ puts("\nInterrupt-Information:\n" "Nr Routine Arg Count\n");
+
+ for (irq = 0; irq < NR_IRQS; 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