From 286d6f8bc498890a8452d9582643908e892b4a22 Mon Sep 17 00:00:00 2001
From: Mike Baker <mbm@openwrt.org>
Date: Thu, 12 Oct 2006 22:54:48 +0000
Subject: rewrite of platform irq handler
SVN-Revision: 5057
---
.../target/linux/aruba-2.6/patches/002-irq.patch | 307 ++++++---------------
1 file changed, 78 insertions(+), 229 deletions(-)
diff --git a/openwrt/target/linux/aruba-2.6/patches/002-irq.patch b/openwrt/target/linux/aruba-2.6/patches/002-irq.patch
index 101ed78a55..f6b9425d8d 100644
--- a/openwrt/target/linux/aruba-2.6/patches/002-irq.patch
+++ b/openwrt/target/linux/aruba-2.6/patches/002-irq.patch
@@ -1,46 +1,7 @@
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
-+ *
-+ *
-+ *
-+ **************************************************************************
-+ */
-+
++++ linux-2.6.17-openwrt/arch/mips/aruba/irq.c 2006-10-12 14:32:40.026285000 -0700
+@@ -0,0 +1,282 @@
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
@@ -65,22 +26,7 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+
+#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;
@@ -88,7 +34,7 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+} intr_group_t;
+
+static const intr_group_t intr_group_merlot[NUM_INTR_GROUPS] = {
-+ {0xffffffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0)},
++ {0x00000000, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0)},
+};
+
+#define READ_PEND_MERLOT(base) (*((volatile unsigned long *)(0xbc003010)))
@@ -107,18 +53,6 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+#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) {
@@ -131,55 +65,51 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+ }
+}
+
-+static inline void enable_local_irq(unsigned int ip)
++static inline void enable_local_irq(unsigned int irq)
+{
-+ set_c0_status(0x100 << ip);
++ clear_c0_cause(0x100 << irq);
++ set_c0_status(0x100 << irq);
+ irq_enable_hazard();
+}
+
-+static inline void disable_local_irq(unsigned int ip)
++static inline void disable_local_irq(unsigned int irq)
+{
-+ clear_c0_status(0x100 << ip);
++ clear_c0_status(0x100 << irq);
++ clear_c0_cause(0x100 << irq);
+ irq_disable_hazard();
+}
+
-+static void aruba_enable_irq(unsigned int irq_nr)
++static inline void aruba_irq_enable(unsigned int irq)
+{
+ unsigned long flags;
-+ int ip = irq_nr - GROUP0_IRQ_BASE;
-+ unsigned int group, intr_bit;
-+ volatile unsigned int *addr;
-+
++ unsigned int group, intr_bit;
++ volatile unsigned int *addr;
+
+ local_irq_save(flags);
-+
-+ if (ip < 0) {
-+ enable_local_irq(irq_nr);
++
++ if (irq < GROUP0_IRQ_BASE) {
++ enable_local_irq(irq);
+ } else {
-+ // calculate group
++ int ip = irq - GROUP0_IRQ_BASE;
+ switch (mips_machtype) {
+ case MACH_ARUBA_AP70:
++ // irqs are in groups of 32
++ // ip is set to the remainder
+ 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;
++ ip &= 0x1f;
+
-+ switch (mips_machtype) {
-+ case MACH_ARUBA_AP70:
++ // bit -> 0 = unmask
++ intr_bit = 1 << ip;
+ 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:
++ group = 0;
++
++ // bit -> 1 = unmasked
++ intr_bit = 1 << ip;
+ addr = intr_group_merlot[group].base_addr;
+ WRITE_MASK_MERLOT(addr, READ_MASK_MERLOT(addr) | intr_bit);
+ break;
@@ -189,62 +119,57 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+
+ back_to_back_c0_hazard();
+ local_irq_restore(flags);
-+
+}
+
-+static void aruba_disable_irq(unsigned int irq_nr)
++static void aruba_irq_disable(unsigned int irq)
+{
+ unsigned long flags;
-+ int ip = irq_nr - GROUP0_IRQ_BASE;
-+ unsigned int group, intr_bit, mask;
-+ volatile unsigned int *addr;
++ unsigned int group, intr_bit, mask;
++ volatile unsigned int *addr;
+
+ local_irq_save(flags);
+
-+ if (ip < 0) {
-+ disable_local_irq(irq_nr);
++ if (irq < GROUP0_IRQ_BASE) {
++ disable_local_irq(irq);
+ } else {
-+ // calculate group
++ int ip = irq - GROUP0_IRQ_BASE;
+ switch (mips_machtype) {
+ case MACH_ARUBA_AP70:
-+ group = ip >> 5;
-+ break;
-+ case MACH_ARUBA_AP65:
-+ case MACH_ARUBA_AP60:
-+ default:
-+ group = 0;
-+ break;
-+ }
++ idt_gpio->gpioistat &= ~(1 << ip);
+
-+ // calc interrupt bit within group
-+ ip -= group << 5;
-+ intr_bit = 1 << ip;
++ // irqs are in groups of 32
++ // ip is set to the remainder
++ group = ip >> 5;
++ ip &= 0x1f;
+
-+ switch (mips_machtype) {
-+ case MACH_ARUBA_AP70:
++ // bit -> 1 = mask
++ intr_bit = 1 << ip;
+ 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)
++
++ if (mask == intr_group_muscat[group].mask) {
+ disable_local_irq(group_to_ip(group));
++ }
+ break;
++
+ case MACH_ARUBA_AP65:
+ case MACH_ARUBA_AP60:
-+ default:
++ group = 0;
++
++ // bit -> 0 = masked
++ intr_bit = 1 << ip;
+ 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);
++
++ if (mask == intr_group_merlot[group].mask) {
++ disable_local_irq(group_to_ip(group));
++ }
+ break;
+ }
+ }
@@ -253,91 +178,33 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+ local_irq_restore(flags);
+}
+
-+static unsigned int startup_irq(unsigned int irq_nr)
++static unsigned int aruba_irq_startup(unsigned int irq)
+{
-+ aruba_enable_irq(irq_nr);
++ aruba_irq_enable(irq);
+ return 0;
+}
+
-+static void shutdown_irq(unsigned int irq_nr)
-+{
-+ aruba_disable_irq(irq_nr);
-+}
++#define aruba_irq_shutdown aruba_irq_disable
+
-+static void mask_and_ack_irq(unsigned int irq_nr)
++static void aruba_irq_ack(unsigned int irq)
+{
-+ aruba_disable_irq(irq_nr);
++ aruba_irq_disable(irq);
+}
+
-+static void end_irq(unsigned int irq_nr)
++static void aruba_irq_end(unsigned int irq)
+{
-+
-+ 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;
-+ }
-+ }
++ if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
++ aruba_irq_enable(irq);
+}
+
+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,
++ .typename = "ARUBA",
++ .startup = aruba_irq_startup,
++ .shutdown = aruba_irq_shutdown,
++ .enable = aruba_irq_enable,
++ .disable = aruba_irq_disable,
++ .ack = aruba_irq_ack,
++ .end = aruba_irq_end,
+};
+
+void __init arch_init_irq(void)
@@ -346,8 +213,6 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+ 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;
@@ -393,9 +258,9 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+ addr = intr_group_muscat[group].base_addr;
+
+ pend = READ_PEND_MUSCAT(addr);
-+ pend &= ~READ_MASK_MUSCAT(addr); // only unmasked interrupts
++ pend &= ~READ_MASK_MUSCAT(addr); // only unmasked interrupts
+ pend = 39 - rc32434_clz(pend);
-+ do_IRQ((group << 5) + pend, regs);
++ do_IRQ(pend + (group << 5), regs);
+ }
+ break;
+ case MACH_ARUBA_AP65:
@@ -404,33 +269,17 @@ diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/arub
+ 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);
-+ }
++ pend = 31 - rc32434_clz(pend);
++ do_IRQ(pend + GROUP0_IRQ_BASE, regs);
++ }
++ if ((ip = (cp0_cause & 0x3c00))) { // irq 2-5
++ pend = 31 - rc32434_clz(ip);
++ do_IRQ(pend - GROUP0_IRQ_BASE, regs);
+ }
+ break;
+ }
--
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