path: root/target/linux/aruba-2.6/patches/002-irq.patch

diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/aruba/irq.c
--- linux-2.6.17/arch/mips/aruba/irq.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-openwrt/arch/mips/aruba/irq.c	2006-01-10 00:32:32.000000000 +0100
@@ -0,0 +1,433 @@
+/**************************************************************************
+ *
+ *  BRIEF MODULE DESCRIPTION
+ *     Interrupt routines for IDT EB434 boards / Atheros boards
+ *     Modified by Aruba Networks
+ *
+ *  Copyright 2004 IDT Inc. (rischelp@idt.com)
+ *         
+ *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ **************************************************************************
+ * May 2004 rkt, neb
+ *
+ * Initial Release
+ *
+ * 
+ *
+ **************************************************************************
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/delay.h>
+
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/idt-boards/rc32434/rc32434.h>
+#include <asm/idt-boards/rc32434/rc32434_gpio.h>
+
+#include <asm/irq.h>
+
+#undef DEBUG_IRQ
+#ifdef DEBUG_IRQ
+/* note: prints function name for you */
+#define DPRINTK(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ## args)
+#else
+#define DPRINTK(fmt, args...)
+#endif
+
+extern void aruba_timer_interrupt(struct pt_regs *regs);
+static unsigned int startup_irq(unsigned int irq);
+static void end_irq(unsigned int irq_nr);
+static void mask_and_ack_irq(unsigned int irq_nr);
+static void aruba_enable_irq(unsigned int irq_nr);
+static void aruba_disable_irq(unsigned int irq_nr);
+
+extern void __init init_generic_irq(void);
+
+typedef struct {
+	u32 mask;
+	volatile u32 *base_addr;
+} intr_group_t;
+
+static const intr_group_t intr_group_merlot[NUM_INTR_GROUPS] = {
+	{0xffffffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0)},
+};
+
+#define READ_PEND_MERLOT(base) (*((volatile unsigned long *)(0xbc003010)))
+#define READ_MASK_MERLOT(base) (*((volatile unsigned long *)(0xbc003014)))
+#define WRITE_MASK_MERLOT(base, val) ((*((volatile unsigned long *)(0xbc003014))) = (val), READ_MASK_MERLOT())
+
+static const intr_group_t intr_group_muscat[NUM_INTR_GROUPS] = {
+	{0x0000efff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)},
+	{0x00001fff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)},
+	{0x00000007, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)},
+	{0x0003ffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)},
+	{0xffffffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)}
+};
+
+#define READ_PEND_MUSCAT(base) (*(base))
+#define READ_MASK_MUSCAT(base) (*(base + 2))
+#define WRITE_MASK_MUSCAT(base, val) (*(base + 2) = (val))
+
+static inline int irq_to_group(unsigned int irq_nr)
+{
+	switch (mips_machtype) {
+		case MACH_ARUBA_AP70:
+			return ((irq_nr - GROUP0_IRQ_BASE) >> 5);
+		case MACH_ARUBA_AP65:
+		case MACH_ARUBA_AP60:
+		default:
+			return 0;
+	}
+}
+
+static inline int group_to_ip(unsigned int group)
+{
+	switch (mips_machtype) {
+		case MACH_ARUBA_AP70:
+			return group + 2;
+		case MACH_ARUBA_AP65:
+		case MACH_ARUBA_AP60:
+		default:
+			return 6;
+	}
+}
+
+static inline void enable_local_irq(unsigned int ip)
+{
+	set_c0_status(0x100 << ip);
+	irq_enable_hazard();
+}
+
+static inline void disable_local_irq(unsigned int ip)
+{
+	clear_c0_status(0x100 << ip);
+	irq_disable_hazard();
+}
+
+static void aruba_enable_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+	int ip = irq_nr - GROUP0_IRQ_BASE;
+	unsigned int group, intr_bit;
+	volatile unsigned int *addr;
+
+
+	local_irq_save(flags);
+	
+	if (ip < 0) {
+		enable_local_irq(irq_nr);
+	} else {
+		// calculate group
+		switch (mips_machtype) {
+			case MACH_ARUBA_AP70:
+				group = ip >> 5;
+				break;
+			case MACH_ARUBA_AP65:
+			case MACH_ARUBA_AP60:
+			default:
+				group = 0;
+				break;
+		}
+
+		// calc interrupt bit within group
+		ip -= (group << 5);
+		intr_bit = 1 << ip;
+
+		switch (mips_machtype) {
+			case MACH_ARUBA_AP70:
+				addr = intr_group_muscat[group].base_addr;
+				WRITE_MASK_MUSCAT(addr, READ_MASK_MUSCAT(addr) & ~intr_bit);
+				break;
+			case MACH_ARUBA_AP65:
+			case MACH_ARUBA_AP60:
+			default:
+				addr = intr_group_merlot[group].base_addr;
+				WRITE_MASK_MERLOT(addr, READ_MASK_MERLOT(addr) | intr_bit);
+				break;
+		}
+		enable_local_irq(group_to_ip(group));
+	}
+
+	back_to_back_c0_hazard();
+	local_irq_restore(flags);
+
+}
+
+static void aruba_disable_irq(unsigned int irq_nr)
+{
+	unsigned long flags;
+	int ip = irq_nr - GROUP0_IRQ_BASE;
+	unsigned int group, intr_bit, mask;
+	volatile unsigned int *addr;
+
+	local_irq_save(flags);
+
+	if (ip < 0) {
+		disable_local_irq(irq_nr);
+	} else {
+		// calculate group
+		switch (mips_machtype) {
+			case MACH_ARUBA_AP70:
+				group = ip >> 5;
+				break;
+			case MACH_ARUBA_AP65:
+			case MACH_ARUBA_AP60:
+			default:
+				group = 0;
+				break;
+		}
+
+		// calc interrupt bit within group
+		ip -= group << 5;
+		intr_bit = 1 << ip;
+
+		switch (mips_machtype) {
+			case MACH_ARUBA_AP70:
+				addr = intr_group_muscat[group].base_addr;
+				// mask intr within group
+				mask = READ_MASK_MUSCAT(addr);
+				mask |= intr_bit;
+				WRITE_MASK_MUSCAT(addr, mask);
+	
+				/*
+				   if there are no more interrupts enabled in this
+				   group, disable corresponding IP
+				 */
+				if (mask == intr_group_muscat[group].mask)
+					disable_local_irq(group_to_ip(group));
+				break;
+			case MACH_ARUBA_AP65:
+			case MACH_ARUBA_AP60:
+			default:
+				addr = intr_group_merlot[group].base_addr;
+				// mask intr within group
+				mask = READ_MASK_MERLOT(addr);
+				mask &= ~intr_bit;
+				if (!mask)
+					disable_local_irq(group_to_ip(group));
+				WRITE_MASK_MERLOT(addr, mask);
+				break;
+		}
+	}
+
+	back_to_back_c0_hazard();
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_irq(unsigned int irq_nr)
+{
+	aruba_enable_irq(irq_nr);
+	return 0;
+}
+
+static void shutdown_irq(unsigned int irq_nr)
+{
+	aruba_disable_irq(irq_nr);
+}
+
+static void mask_and_ack_irq(unsigned int irq_nr)
+{
+	aruba_disable_irq(irq_nr);
+}
+
+static void end_irq(unsigned int irq_nr)
+{
+
+	int ip = irq_nr - GROUP0_IRQ_BASE;
+	unsigned int intr_bit, group;
+	volatile unsigned int *addr;
+
+
+	if (irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)) {
+		printk("warning: end_irq %d did not enable (%x)\n",
+		       irq_nr, irq_desc[irq_nr].status);
+		/* fall through; enable the interrupt
+		 * -- It'll get stuck otherwise
+		 */
+
+	} 
+
+	if (ip<0) {
+		enable_local_irq(irq_nr);
+	} else {
+
+		switch (mips_machtype) {
+			case MACH_ARUBA_AP70:
+				if (irq_nr == GROUP4_IRQ_BASE + 9)       idt_gpio->gpioistat &= 0xfffffdff;
+				else if (irq_nr == GROUP4_IRQ_BASE + 10) idt_gpio->gpioistat &= 0xfffffbff;
+				else if (irq_nr == GROUP4_IRQ_BASE + 11) idt_gpio->gpioistat &= 0xfffff7ff;
+				else if (irq_nr == GROUP4_IRQ_BASE + 12) idt_gpio->gpioistat &= 0xffffefff;
+		
+				group = ip >> 5;
+			
+				// calc interrupt bit within group
+				ip -= (group << 5);
+				intr_bit = 1 << ip;
+		
+				// first enable the IP mapped to this IRQ
+				enable_local_irq(group_to_ip(group));
+		
+				addr = intr_group_muscat[group].base_addr;
+				// unmask intr within group
+				WRITE_MASK_MUSCAT(addr, READ_MASK_MUSCAT(addr) & ~intr_bit);
+				break;
+
+			case MACH_ARUBA_AP65:
+			case MACH_ARUBA_AP60:
+			default:
+				group = 0;
+	
+				// calc interrupt bit within group
+				intr_bit = 1 << ip;
+	
+				// first enable the IP mapped to this IRQ
+				enable_local_irq(group_to_ip(group));
+	
+				addr = intr_group_merlot[group].base_addr;
+				// unmask intr within group
+				WRITE_MASK_MERLOT(addr, READ_MASK_MERLOT(addr) | intr_bit);
+				break;
+		}
+	}
+}
+
+static struct hw_interrupt_type aruba_irq_type = {
+	.typename = "ARUBA",
+	.startup = startup_irq,
+	.shutdown = shutdown_irq,
+	.enable = aruba_enable_irq,
+	.disable = aruba_disable_irq,
+	.ack = mask_and_ack_irq,
+	.end = end_irq,
+};
+
+void __init arch_init_irq(void)
+{
+	int i;
+	printk("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
+	memset(irq_desc, 0, sizeof(irq_desc));
+
+	set_c0_status(0xFF00);
+
+	for (i = 0; i < RC32434_NR_IRQS; i++) {
+		irq_desc[i].status = IRQ_DISABLED;
+		irq_desc[i].action = NULL;
+		irq_desc[i].depth = 1;
+		irq_desc[i].handler = &aruba_irq_type;
+		spin_lock_init(&irq_desc[i].lock);
+	}
+}
+
+/* Main Interrupt dispatcher */
+
+void plat_irq_dispatch(struct pt_regs *regs)
+{
+	unsigned int pend, group, ip;
+	volatile unsigned int *addr;
+	unsigned long cp0_cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
+
+	if (cp0_cause & CAUSEF_IP7)
+		return aruba_timer_interrupt(regs);
+
+	if(cp0_cause == 0) {
+		printk("INTERRUPT(S) FIRED WHILE MASKED\n");
+#ifdef ARUBA_DEBUG
+		// debuging use -- figure out which interrupt(s) fired
+		cp0_cause = read_c0_cause() & CAUSEF_IP;
+		while (cp0_cause) {
+			unsigned long intr_bit;
+			unsigned int irq_nr;
+			intr_bit = (31 - rc32434_clz(cp0_cause));
+			irq_nr = intr_bit - GROUP0_IRQ_BASE;
+			printk(" ---> MASKED IRQ %d\n",irq_nr);
+			cp0_cause &= ~(1 << intr_bit);
+		}
+#endif
+		return;
+	}
+
+	switch (mips_machtype) {
+		case MACH_ARUBA_AP70:
+			if ((ip = (cp0_cause & 0x7c00))) {
+				group = 21 - rc32434_clz(ip);
+		
+				addr = intr_group_muscat[group].base_addr;
+		
+				pend = READ_PEND_MUSCAT(addr);
+				pend &= ~READ_MASK_MUSCAT(addr);	// only unmasked interrupts
+				pend = 39 - rc32434_clz(pend);
+				do_IRQ((group << 5) + pend, regs);
+			}
+			break;
+		case MACH_ARUBA_AP65:
+		case MACH_ARUBA_AP60:
+		default:
+			if (cp0_cause & 0x4000) { // 1 << (8 +6) == irq 6
+				// Misc Interrupt
+				group = 0;
+				addr = intr_group_merlot[group].base_addr;
+				pend = READ_PEND_MERLOT(addr);
+				pend &= READ_MASK_MERLOT(addr);	// only unmasked interrupts
+				/* handle one misc interrupt at a time */
+				while (pend)
+				{
+					unsigned long intr_bit;
+					unsigned int irq_nr;
+
+					intr_bit = (31 - rc32434_clz(pend));
+					irq_nr = intr_bit + GROUP0_IRQ_BASE;
+
+					do_IRQ(irq_nr, regs);
+					pend &= ~(1 << intr_bit);
+				}
+			} else if (cp0_cause & 0x3c00) { // irq 2-5
+				while (cp0_cause)
+				{
+					unsigned long intr_bit;
+					unsigned int irq_nr;
+
+					intr_bit = (31 - rc32434_clz(cp0_cause));
+					irq_nr = intr_bit - GROUP0_IRQ_BASE;
+
+					do_IRQ(irq_nr, regs);
+					cp0_cause &= ~(1 << intr_bit);
+				}
+			}
+			break;
+	}
+}