MIPS: Platform files for XLR/XLS processor support

* include/asm/netlogic added with files common for all Netlogic processors
  (common with XLP which will be added later)
* include/asm/netlogic/xlr for XLR/XLS chip specific files
* netlogic/xlr for XLR/XLS platform files

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2334/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/arch/mips/netlogic/xlr/irq.c b/arch/mips/netlogic/xlr/irq.c
new file mode 100644
index 000000000000..2033f5656f68
--- /dev/null
+++ b/arch/mips/netlogic/xlr/irq.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
+ * reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the NetLogic
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``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 NETLOGIC OR CONTRIBUTORS 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+
+#include <asm/mipsregs.h>
+
+#include <asm/netlogic/xlr/iomap.h>
+#include <asm/netlogic/xlr/pic.h>
+#include <asm/netlogic/xlr/xlr.h>
+
+#include <asm/netlogic/interrupt.h>
+#include <asm/netlogic/mips-extns.h>
+
+static u64 nlm_irq_mask;
+static DEFINE_SPINLOCK(nlm_pic_lock);
+
+static void xlr_pic_enable(struct irq_data *d)
+{
+        nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
+        unsigned long flags;
+        nlm_reg_t reg;
+        int irq = d->irq;
+
+        WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
+
+        spin_lock_irqsave(&nlm_pic_lock, flags);
+        reg = netlogic_read_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE);
+        netlogic_write_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE,
+                          reg | (1 << 6) | (1 << 30) | (1 << 31));
+        spin_unlock_irqrestore(&nlm_pic_lock, flags);
+}
+
+static void xlr_pic_mask(struct irq_data *d)
+{
+        nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
+        unsigned long flags;
+        nlm_reg_t reg;
+        int irq = d->irq;
+
+        WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
+
+        spin_lock_irqsave(&nlm_pic_lock, flags);
+        reg = netlogic_read_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE);
+        netlogic_write_reg(mmio, PIC_IRT_1_BASE + irq - PIC_IRQ_BASE,
+                          reg | (1 << 6) | (1 << 30) | (0 << 31));
+        spin_unlock_irqrestore(&nlm_pic_lock, flags);
+}
+
+static void xlr_pic_ack(struct irq_data *d)
+{
+        unsigned long flags;
+        nlm_reg_t *mmio;
+        int irq = d->irq;
+
+        WARN(!PIC_IRQ_IS_IRT(irq), "Bad irq %d", irq);
+
+        mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
+        spin_lock_irqsave(&nlm_pic_lock, flags);
+        netlogic_write_reg(mmio, PIC_INT_ACK, (1 << (irq - PIC_IRQ_BASE)));
+        spin_unlock_irqrestore(&nlm_pic_lock, flags);
+}
+
+/*
+ * This chip definition handles interrupts routed thru the XLR
+ * hardware PIC, currently IRQs 8-39 are mapped to hardware intr
+ * 0-31 wired the XLR PIC
+ */
+static struct irq_chip xlr_pic = {
+        .name           = "XLR-PIC",
+        .irq_enable     = xlr_pic_enable,
+        .irq_mask       = xlr_pic_mask,
+        .irq_ack        = xlr_pic_ack,
+};
+
+static void rsvd_irq_handler(struct irq_data *d)
+{
+        WARN(d->irq >= PIC_IRQ_BASE, "Bad irq %d", d->irq);
+}
+
+/*
+ * Chip definition for CPU originated interrupts(timer, msg) and
+ * IPIs
+ */
+struct irq_chip nlm_cpu_intr = {
+        .name           = "XLR-CPU-INTR",
+        .irq_enable     = rsvd_irq_handler,
+        .irq_mask       = rsvd_irq_handler,
+        .irq_ack        = rsvd_irq_handler,
+};
+
+void __init init_xlr_irqs(void)
+{
+        nlm_reg_t *mmio = netlogic_io_mmio(NETLOGIC_IO_PIC_OFFSET);
+        uint32_t thread_mask = 1;
+        int level, i;
+
+        pr_info("Interrupt thread mask [%x]\n", thread_mask);
+        for (i = 0; i < PIC_NUM_IRTS; i++) {
+                level = PIC_IRQ_IS_EDGE_TRIGGERED(i);
+
+                /* Bind all PIC irqs to boot cpu */
+                netlogic_write_reg(mmio, PIC_IRT_0_BASE + i, thread_mask);
+
+                /*
+                 * Use local scheduling and high polarity for all IRTs
+                 * Invalidate all IRTs, by default
+                 */
+                netlogic_write_reg(mmio, PIC_IRT_1_BASE + i,
+                                (level << 30) | (1 << 6) | (PIC_IRQ_BASE + i));
+        }
+
+        /* Make all IRQs as level triggered by default */
+        for (i = 0; i < NR_IRQS; i++) {
+                if (PIC_IRQ_IS_IRT(i))
+                        irq_set_chip_and_handler(i, &xlr_pic, handle_level_irq);
+                else
+                        irq_set_chip_and_handler(i, &nlm_cpu_intr,
+                                                handle_level_irq);
+        }
+#ifdef CONFIG_SMP
+        irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr,
+                         nlm_smp_function_ipi_handler);
+        irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr,
+                         nlm_smp_resched_ipi_handler);
+        nlm_irq_mask |=
+            ((1ULL << IRQ_IPI_SMP_FUNCTION) | (1ULL << IRQ_IPI_SMP_RESCHEDULE));
+#endif
+        /* unmask all PIC related interrupts. If no handler is installed by the
+         * drivers, it'll just ack the interrupt and return
+         */
+        for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++)
+                nlm_irq_mask |= (1ULL << i);
+
+        nlm_irq_mask |= (1ULL << IRQ_TIMER);
+}
+
+void __init arch_init_irq(void)
+{
+        /* Initialize the irq descriptors */
+        init_xlr_irqs();
+        write_c0_eimr(nlm_irq_mask);
+}
+
+void __cpuinit nlm_smp_irq_init(void)
+{
+        /* set interrupt mask for non-zero cpus */
+        write_c0_eimr(nlm_irq_mask);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+        uint64_t eirr;
+        int i;
+
+        eirr = read_c0_eirr() & read_c0_eimr();
+        if (!eirr)
+                return;
+
+        /* no need of EIRR here, writing compare clears interrupt */
+        if (eirr & (1 << IRQ_TIMER)) {
+                do_IRQ(IRQ_TIMER);
+                return;
+        }
+
+        /* TODO use dcltz: optimize below code */
+        for (i = 63; i != -1; i--) {
+                if (eirr & (1ULL << i))
+                        break;
+        }
+        if (i == -1) {
+                pr_err("no interrupt !!\n");
+                return;
+        }
+
+        /* Ack eirr */
+        write_c0_eirr(1ULL << i);
+
+        do_IRQ(i);
+}