Initial revision

1 files changed, 383 insertions, 0 deletions

diff --git a/cpu/mpc8260/interrupts.c b/cpu/mpc8260/interrupts.c
new file mode 100644
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--- /dev/null
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+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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
+ *
+ * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 22-Oct-00
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <mpc8260.h>
+#include <mpc8260_irq.h>
+#include <asm/processor.h>
+
+/****************************************************************************/
+
+unsigned decrementer_count;		/* count val for 1e6/HZ microseconds */
+
+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/ppc/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 *) CFG_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 *) CFG_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 *) CFG_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 *) CFG_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/ppc/kernel/ppc8260_pic.c		    */
+/****************************************************************************/
+
+static __inline__ unsigned long get_msr (void)
+{
+	unsigned long msr;
+
+	__asm__ __volatile__ ("mfmsr %0":"=r" (msr):);
+
+	return msr;
+}
+
+static __inline__ void set_msr (unsigned long msr)
+{
+	__asm__ __volatile__ ("mtmsr %0"::"r" (msr));
+}
+
+static __inline__ unsigned long get_dec (void)
+{
+	unsigned long val;
+
+	__asm__ __volatile__ ("mfdec %0":"=r" (val):);
+
+	return val;
+}
+
+static __inline__ void set_dec (unsigned long val)
+{
+	__asm__ __volatile__ ("mtdec %0"::"r" (val));
+}
+
+void enable_interrupts (void)
+{
+	set_msr (get_msr () | MSR_EE);
+}
+
+/* returns flag if MSR_EE was set before */
+int disable_interrupts (void)
+{
+	ulong msr = get_msr ();
+
+	set_msr (msr & ~MSR_EE);
+	return ((msr & MSR_EE) != 0);
+}
+
+/****************************************************************************/
+
+int interrupt_init (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+
+	decrementer_count = (gd->bus_clk / 4) / CFG_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;
+
+	set_dec (decrementer_count);
+
+	set_msr (get_msr () | MSR_EE);
+
+	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);
+
+	set_msr (get_msr () | MSR_EE);
+
+	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;
+}
+
+/****************************************************************************/
+
+volatile ulong timestamp = 0;
+
+/*
+ * timer_interrupt - gets called when the decrementer overflows,
+ * with interrupts disabled.
+ * Trivial implementation - no need to be really accurate.
+ */
+void timer_interrupt (struct pt_regs *regs)
+{
+#if defined(CONFIG_WATCHDOG) || defined(CFG_HYMOD_DBLEDS)
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+#endif							/* CONFIG_WATCHDOG */
+
+	/* Restore Decrementer Count */
+	set_dec (decrementer_count);
+
+	timestamp++;
+
+#if defined(CONFIG_WATCHDOG) || \
+    defined(CFG_CMA_LCD_HEARTBEAT) || \
+    defined(CFG_HYMOD_DBLEDS)
+
+	if ((timestamp % CFG_HZ) == 0) {
+#if defined(CFG_CMA_LCD_HEARTBEAT)
+		extern void lcd_heartbeat (void);
+#endif							/* CFG_CMA_LCD_HEARTBEAT */
+#if defined(CFG_HYMOD_DBLEDS)
+		volatile iop8260_t *iop = &immr->im_ioport;
+		static int shift = 0;
+#endif							/* CFG_HYMOD_DBLEDS */
+
+#if defined(CFG_CMA_LCD_HEARTBEAT)
+		lcd_heartbeat ();
+#endif							/* CFG_CMA_LCD_HEARTBEAT */
+
+#if defined(CONFIG_WATCHDOG)
+		reset_8260_watchdog (immr);
+#endif							/* CONFIG_WATCHDOG */
+
+#if defined(CFG_HYMOD_DBLEDS)
+		/* hymod daughter board LEDs */
+		if (++shift > 3)
+			shift = 0;
+		iop->iop_pdatd =
+				(iop->iop_pdatd & ~0x0f000000) | (1 << (24 + shift));
+#endif							/* CFG_HYMOD_DBLEDS */
+	}
+#endif							/* CONFIG_WATCHDOG || CFG_CMA_LCD_HEARTBEAT */
+}
+
+/****************************************************************************/
+
+void reset_timer (void)
+{
+	timestamp = 0;
+}
+
+ulong get_timer (ulong base)
+{
+	return (timestamp - base);
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+/****************************************************************************/
+
+#if (CONFIG_COMMANDS & CFG_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 *argv[])
+{
+	int irq, re_enable;
+
+	re_enable = disable_interrupts ();
+
+	printf ("\nInterrupt-Information:\n");
+	printf ("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							/* CONFIG_COMMANDS & CFG_CMD_IRQ */