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Diffstat (limited to 'arch/arc/kernel/intc-arcv2.c')
-rw-r--r--arch/arc/kernel/intc-arcv2.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c
new file mode 100644
index 000000000..26c156827
--- /dev/null
+++ b/arch/arc/kernel/intc-arcv2.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2014 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <asm/irq.h>
+
+/*
+ * Early Hardware specific Interrupt setup
+ * -Called very early (start_kernel -> setup_arch -> setup_processor)
+ * -Platform Independent (must for any ARC Core)
+ * -Needed for each CPU (hence not foldable into init_IRQ)
+ */
+void arc_init_IRQ(void)
+{
+ unsigned int tmp;
+
+ struct aux_irq_ctrl {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned int res3:18, save_idx_regs:1, res2:1,
+ save_u_to_u:1, save_lp_regs:1, save_blink:1,
+ res:4, save_nr_gpr_pairs:5;
+#else
+ unsigned int save_nr_gpr_pairs:5, res:4,
+ save_blink:1, save_lp_regs:1, save_u_to_u:1,
+ res2:1, save_idx_regs:1, res3:18;
+#endif
+ } ictrl;
+
+ *(unsigned int *)&ictrl = 0;
+
+ ictrl.save_nr_gpr_pairs = 6; /* r0 to r11 (r12 saved manually) */
+ ictrl.save_blink = 1;
+ ictrl.save_lp_regs = 1; /* LP_COUNT, LP_START, LP_END */
+ ictrl.save_u_to_u = 0; /* user ctxt saved on kernel stack */
+ ictrl.save_idx_regs = 1; /* JLI, LDI, EI */
+
+ WRITE_AUX(AUX_IRQ_CTRL, ictrl);
+
+ /* setup status32, don't enable intr yet as kernel doesn't want */
+ tmp = read_aux_reg(0xa);
+ tmp |= ISA_INIT_STATUS_BITS;
+ tmp &= ~STATUS_IE_MASK;
+ asm volatile("flag %0 \n"::"r"(tmp));
+
+ /*
+ * ARCv2 core intc provides multiple interrupt priorities (upto 16).
+ * Typical builds though have only two levels (0-high, 1-low)
+ * Linux by default uses lower prio 1 for most irqs, reserving 0 for
+ * NMI style interrupts in future (say perf)
+ *
+ * Read the intc BCR to confirm that Linux default priority is avail
+ * in h/w
+ *
+ * Note:
+ * IRQ_BCR[27..24] contains N-1 (for N priority levels) and prio level
+ * is 0 based.
+ */
+ tmp = (read_aux_reg(ARC_REG_IRQ_BCR) >> 24 ) & 0xF;
+ if (ARCV2_IRQ_DEF_PRIO > tmp)
+ panic("Linux default irq prio incorrect\n");
+}
+
+static void arcv2_irq_mask(struct irq_data *data)
+{
+ write_aux_reg(AUX_IRQ_SELECT, data->irq);
+ write_aux_reg(AUX_IRQ_ENABLE, 0);
+}
+
+static void arcv2_irq_unmask(struct irq_data *data)
+{
+ write_aux_reg(AUX_IRQ_SELECT, data->irq);
+ write_aux_reg(AUX_IRQ_ENABLE, 1);
+}
+
+void arcv2_irq_enable(struct irq_data *data)
+{
+ /* set default priority */
+ write_aux_reg(AUX_IRQ_SELECT, data->irq);
+ write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO);
+
+ /*
+ * hw auto enables (linux unmask) all by default
+ * So no need to do IRQ_ENABLE here
+ * XXX: However OSCI LAN need it
+ */
+ write_aux_reg(AUX_IRQ_ENABLE, 1);
+}
+
+static struct irq_chip arcv2_irq_chip = {
+ .name = "ARCv2 core Intc",
+ .irq_mask = arcv2_irq_mask,
+ .irq_unmask = arcv2_irq_unmask,
+ .irq_enable = arcv2_irq_enable
+};
+
+static int arcv2_irq_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ if (irq == TIMER0_IRQ || irq == IPI_IRQ)
+ irq_set_chip_and_handler(irq, &arcv2_irq_chip, handle_percpu_irq);
+ else
+ irq_set_chip_and_handler(irq, &arcv2_irq_chip, handle_level_irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops arcv2_irq_ops = {
+ .xlate = irq_domain_xlate_onecell,
+ .map = arcv2_irq_map,
+};
+
+static struct irq_domain *root_domain;
+
+static int __init
+init_onchip_IRQ(struct device_node *intc, struct device_node *parent)
+{
+ if (parent)
+ panic("DeviceTree incore intc not a root irq controller\n");
+
+ root_domain = irq_domain_add_legacy(intc, NR_CPU_IRQS, 0, 0,
+ &arcv2_irq_ops, NULL);
+
+ if (!root_domain)
+ panic("root irq domain not avail\n");
+
+ /* with this we don't need to export root_domain */
+ irq_set_default_host(root_domain);
+
+ return 0;
+}
+
+IRQCHIP_DECLARE(arc_intc, "snps,archs-intc", init_onchip_IRQ);