irqchip: armada-370-xp: Add suspend/resume support

This commit adds suspend/resume support to the irqchip driver used on
Armada XP platforms (amongst others). It does so by adding a set of
suspend/resume syscore_ops, that will respectively save and restore
the necessary registers to ensure interrupts continue to work after
resume.

It is worth mentioning that the affinity is lost during a
suspend/resume cycle, because when a secondary CPU is brought
off-line, all interrupts that are assigned to this CPU in terms of
affinity gets re-assigned to a still running CPU. Therefore, right
before entering suspend, all interrupts are assigned to the boot CPU.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: linux-kernel@vger.kernel.org
Link: https://lkml.kernel.org/r/1416585613-2113-4-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 3e238cd..4ec137b 100644 (file)
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -26,6 +26,7 @@
 #include <linux/of_pci.h>
 #include <linux/irqdomain.h>
 #include <linux/slab.h>
+#include <linux/syscore_ops.h>
 #include <linux/msi.h>
 #include <asm/mach/arch.h>
 #include <asm/exception.h>
@@ -66,6 +67,7 @@
 static void __iomem *per_cpu_int_base;
 static void __iomem *main_int_base;
 static struct irq_domain *armada_370_xp_mpic_domain;
+static u32 doorbell_mask_reg;
 #ifdef CONFIG_PCI_MSI
 static struct irq_domain *armada_370_xp_msi_domain;
 static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
@@ -474,6 +476,54 @@ armada_370_xp_handle_irq(struct pt_regs *regs)
        } while (1);
 }
 
+static int armada_370_xp_mpic_suspend(void)
+{
+       doorbell_mask_reg = readl(per_cpu_int_base +
+                                 ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
+       return 0;
+}
+
+static void armada_370_xp_mpic_resume(void)
+{
+       int nirqs;
+       irq_hw_number_t irq;
+
+       /* Re-enable interrupts */
+       nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
+       for (irq = 0; irq < nirqs; irq++) {
+               struct irq_data *data;
+               int virq;
+
+               virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
+               if (virq == 0)
+                       continue;
+
+               if (irq != ARMADA_370_XP_TIMER0_PER_CPU_IRQ)
+                       writel(irq, per_cpu_int_base +
+                              ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+               else
+                       writel(irq, main_int_base +
+                              ARMADA_370_XP_INT_SET_ENABLE_OFFS);
+
+               data = irq_get_irq_data(virq);
+               if (!irqd_irq_disabled(data))
+                       armada_370_xp_irq_unmask(data);
+       }
+
+       /* Reconfigure doorbells for IPIs and MSIs */
+       writel(doorbell_mask_reg,
+              per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
+       if (doorbell_mask_reg & IPI_DOORBELL_MASK)
+               writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+       if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
+               writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
+}
+
+struct syscore_ops armada_370_xp_mpic_syscore_ops = {
+       .suspend        = armada_370_xp_mpic_suspend,
+       .resume         = armada_370_xp_mpic_resume,
+};
+
 static int __init armada_370_xp_mpic_of_init(struct device_node *node,
                                             struct device_node *parent)
 {
@@ -530,6 +580,8 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node,
                                        armada_370_xp_mpic_handle_cascade_irq);
        }
 
+       register_syscore_ops(&armada_370_xp_mpic_syscore_ops);
+
        return 0;
 }