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openwrt-xburst/target/linux/aruba-2.6/patches/002-irq.patch
mbm d865813f56 cosmetic fix for irq error messages 
git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4050 3c298f89-4303-0410-b956-a3cf2f4a3e73
2006-06-22 22:32:51 +00:00

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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;
+ }
+}
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