[MIPS] Routerboard 532: Support for base system
Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/rb532/irq.c b/arch/mips/rb532/irq.c
new file mode 100644
index 0000000..c0d0f95
--- /dev/null
+++ b/arch/mips/rb532/irq.c
@@ -0,0 +1,209 @@
+/*
+ * 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.
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ * stevel@mvista.com or source@mvista.com
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/io.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/bootinfo.h>
+#include <asm/time.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+
+#include <asm/mach-rc32434/rc32434.h>
+
+struct intr_group {
+ u32 mask; /* mask of valid bits in pending/mask registers */
+ volatile u32 *base_addr;
+};
+
+#define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32)
+
+#if (NR_IRQS < RC32434_NR_IRQS)
+#error Too little irqs defined. Did you override <asm/irq.h> ?
+#endif
+
+static const struct intr_group intr_group[NUM_INTR_GROUPS] = {
+ {
+ .mask = 0x0000efff,
+ .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)},
+ {
+ .mask = 0x00001fff,
+ .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)},
+ {
+ .mask = 0x00000007,
+ .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)},
+ {
+ .mask = 0x0003ffff,
+ .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)},
+ {
+ .mask = 0xffffffff,
+ .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)}
+};
+
+#define READ_PEND(base) (*(base))
+#define READ_MASK(base) (*(base + 2))
+#define WRITE_MASK(base, val) (*(base + 2) = (val))
+
+static inline int irq_to_group(unsigned int irq_nr)
+{
+ return (irq_nr - GROUP0_IRQ_BASE) >> 5;
+}
+
+static inline int group_to_ip(unsigned int group)
+{
+ return group + 2;
+}
+
+static inline void enable_local_irq(unsigned int ip)
+{
+ int ipnum = 0x100 << ip;
+
+ set_c0_status(ipnum);
+}
+
+static inline void disable_local_irq(unsigned int ip)
+{
+ int ipnum = 0x100 << ip;
+
+ clear_c0_status(ipnum);
+}
+
+static inline void ack_local_irq(unsigned int ip)
+{
+ int ipnum = 0x100 << ip;
+
+ clear_c0_cause(ipnum);
+}
+
+static void rb532_enable_irq(unsigned int irq_nr)
+{
+ int ip = irq_nr - GROUP0_IRQ_BASE;
+ unsigned int group, intr_bit;
+ volatile unsigned int *addr;
+
+ if (ip < 0)
+ enable_local_irq(irq_nr);
+ else {
+ group = ip >> 5;
+
+ ip &= (1 << 5) - 1;
+ intr_bit = 1 << ip;
+
+ enable_local_irq(group_to_ip(group));
+
+ addr = intr_group[group].base_addr;
+ WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit);
+ }
+}
+
+static void rb532_disable_irq(unsigned int irq_nr)
+{
+ int ip = irq_nr - GROUP0_IRQ_BASE;
+ unsigned int group, intr_bit, mask;
+ volatile unsigned int *addr;
+
+ if (ip < 0) {
+ disable_local_irq(irq_nr);
+ } else {
+ group = ip >> 5;
+
+ ip &= (1 << 5) - 1;
+ intr_bit = 1 << ip;
+ addr = intr_group[group].base_addr;
+ mask = READ_MASK(addr);
+ mask |= intr_bit;
+ WRITE_MASK(addr, mask);
+
+ /*
+ * if there are no more interrupts enabled in this
+ * group, disable corresponding IP
+ */
+ if (mask == intr_group[group].mask)
+ disable_local_irq(group_to_ip(group));
+ }
+}
+
+static void rb532_mask_and_ack_irq(unsigned int irq_nr)
+{
+ rb532_disable_irq(irq_nr);
+ ack_local_irq(group_to_ip(irq_to_group(irq_nr)));
+}
+
+static struct irq_chip rc32434_irq_type = {
+ .name = "RB532",
+ .ack = rb532_disable_irq,
+ .mask = rb532_disable_irq,
+ .mask_ack = rb532_mask_and_ack_irq,
+ .unmask = rb532_enable_irq,
+};
+
+void __init arch_init_irq(void)
+{
+ int i;
+
+ pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
+
+ for (i = 0; i < RC32434_NR_IRQS; i++)
+ set_irq_chip_and_handler(i, &rc32434_irq_type,
+ handle_level_irq);
+}
+
+/* Main Interrupt dispatcher */
+asmlinkage void plat_irq_dispatch(void)
+{
+ unsigned int ip, pend, group;
+ volatile unsigned int *addr;
+ unsigned int cp0_cause = read_c0_cause() & read_c0_status();
+
+ if (cp0_cause & CAUSEF_IP7) {
+ do_IRQ(7);
+ } else {
+ ip = (cp0_cause & 0x7c00);
+ if (ip) {
+ group = 21 + (fls(ip) - 32);
+
+ addr = intr_group[group].base_addr;
+
+ pend = READ_PEND(addr);
+ pend &= ~READ_MASK(addr); /* only unmasked interrupts */
+ pend = 39 + (fls(pend) - 32);
+ do_IRQ((group << 5) + pend);
+ }
+ }
+}