/* * Copyright 2011-2013 Freescale Semiconductor, Inc. * Copyright 2011 Linaro Ltd. * * The code contained herein is licensed under the GNU General Public * License. You may obtain a copy of the GNU General Public License * Version 2 or later at the following locations: * * http://www.opensource.org/licenses/gpl-license.html * http://www.gnu.org/copyleft/gpl.html */ #include <linux/io.h> #include <linux/irq.h> #include <linux/irqchip.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/irqchip/arm-gic.h> #include "common.h" #include "hardware.h" #define GPC_IMR1 0x008 #define GPC_PGC_CPU_PDN 0x2a0 #define GPC_PGC_CPU_PUPSCR 0x2a4 #define GPC_PGC_CPU_PDNSCR 0x2a8 #define GPC_PGC_SW2ISO_SHIFT 0x8 #define GPC_PGC_SW_SHIFT 0x0 #define IMR_NUM 4 #define GPC_MAX_IRQS (IMR_NUM * 32) static void __iomem *gpc_base; static u32 gpc_wake_irqs[IMR_NUM]; static u32 gpc_saved_imrs[IMR_NUM]; void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw) { writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) | (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR); } void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw) { writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) | (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR); } void imx_gpc_set_arm_power_in_lpm(bool power_off) { writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN); } void imx_gpc_pre_suspend(bool arm_power_off) { void __iomem *reg_imr1 = gpc_base + GPC_IMR1; int i; /* Tell GPC to power off ARM core when suspend */ if (arm_power_off) imx_gpc_set_arm_power_in_lpm(arm_power_off); for (i = 0; i < IMR_NUM; i++) { gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4); } } void imx_gpc_post_resume(void) { void __iomem *reg_imr1 = gpc_base + GPC_IMR1; int i; /* Keep ARM core powered on for other low-power modes */ imx_gpc_set_arm_power_in_lpm(false); for (i = 0; i < IMR_NUM; i++) writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4); } static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on) { unsigned int idx = d->hwirq / 32; u32 mask; mask = 1 << d->hwirq % 32; gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask : gpc_wake_irqs[idx] & ~mask; /* * Do *not* call into the parent, as the GIC doesn't have any * wake-up facility... */ return 0; } void imx_gpc_mask_all(void) { void __iomem *reg_imr1 = gpc_base + GPC_IMR1; int i; for (i = 0; i < IMR_NUM; i++) { gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); writel_relaxed(~0, reg_imr1 + i * 4); } } void imx_gpc_restore_all(void) { void __iomem *reg_imr1 = gpc_base + GPC_IMR1; int i; for (i = 0; i < IMR_NUM; i++) writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4); } void imx_gpc_hwirq_unmask(unsigned int hwirq) { void __iomem *reg; u32 val; reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4; val = readl_relaxed(reg); val &= ~(1 << hwirq % 32); writel_relaxed(val, reg); } void imx_gpc_hwirq_mask(unsigned int hwirq) { void __iomem *reg; u32 val; reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4; val = readl_relaxed(reg); val |= 1 << (hwirq % 32); writel_relaxed(val, reg); } static void imx_gpc_irq_unmask(struct irq_data *d) { imx_gpc_hwirq_unmask(d->hwirq); irq_chip_unmask_parent(d); } static void imx_gpc_irq_mask(struct irq_data *d) { imx_gpc_hwirq_mask(d->hwirq); irq_chip_mask_parent(d); } static struct irq_chip imx_gpc_chip = { .name = "GPC", .irq_eoi = irq_chip_eoi_parent, .irq_mask = imx_gpc_irq_mask, .irq_unmask = imx_gpc_irq_unmask, .irq_retrigger = irq_chip_retrigger_hierarchy, .irq_set_wake = imx_gpc_irq_set_wake, .irq_set_type = irq_chip_set_type_parent, #ifdef CONFIG_SMP .irq_set_affinity = irq_chip_set_affinity_parent, #endif }; static int imx_gpc_domain_translate(struct irq_domain *d, struct irq_fwspec *fwspec, unsigned long *hwirq, unsigned int *type) { if (is_of_node(fwspec->fwnode)) { if (fwspec->param_count != 3) return -EINVAL; /* No PPI should point to this domain */ if (fwspec->param[0] != 0) return -EINVAL; *hwirq = fwspec->param[1]; *type = fwspec->param[2]; return 0; } return -EINVAL; } static int imx_gpc_domain_alloc(struct irq_domain *domain, unsigned int irq, unsigned int nr_irqs, void *data) { struct irq_fwspec *fwspec = data; struct irq_fwspec parent_fwspec; irq_hw_number_t hwirq; int i; if (fwspec->param_count != 3) return -EINVAL; /* Not GIC compliant */ if (fwspec->param[0] != 0) return -EINVAL; /* No PPI should point to this domain */ hwirq = fwspec->param[1]; if (hwirq >= GPC_MAX_IRQS) return -EINVAL; /* Can't deal with this */ for (i = 0; i < nr_irqs; i++) irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i, &imx_gpc_chip, NULL); parent_fwspec = *fwspec; parent_fwspec.fwnode = domain->parent->fwnode; return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_fwspec); } static const struct irq_domain_ops imx_gpc_domain_ops = { .translate = imx_gpc_domain_translate, .alloc = imx_gpc_domain_alloc, .free = irq_domain_free_irqs_common, }; static int __init imx_gpc_init(struct device_node *node, struct device_node *parent) { struct irq_domain *parent_domain, *domain; int i; if (!parent) { pr_err("%pOF: no parent, giving up\n", node); return -ENODEV; } parent_domain = irq_find_host(parent); if (!parent_domain) { pr_err("%pOF: unable to obtain parent domain\n", node); return -ENXIO; } gpc_base = of_iomap(node, 0); if (WARN_ON(!gpc_base)) return -ENOMEM; domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS, node, &imx_gpc_domain_ops, NULL); if (!domain) { iounmap(gpc_base); return -ENOMEM; } /* Initially mask all interrupts */ for (i = 0; i < IMR_NUM; i++) writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4); /* * Clear the OF_POPULATED flag set in of_irq_init so that * later the GPC power domain driver will not be skipped. */ of_node_clear_flag(node, OF_POPULATED); return 0; } IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init); void __init imx_gpc_check_dt(void) { struct device_node *np; np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc"); if (WARN_ON(!np)) return; if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) { pr_warn("Outdated DT detected, suspend/resume will NOT work\n"); /* map GPC, so that at least CPUidle and WARs keep working */ gpc_base = of_iomap(np, 0); } }