diff options
Diffstat (limited to 'drivers/sh/intc/core.c')
| -rw-r--r-- | drivers/sh/intc/core.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c new file mode 100644 index 000000000..46f0f322d --- /dev/null +++ b/drivers/sh/intc/core.c @@ -0,0 +1,512 @@ +/* + * Shared interrupt handling code for IPR and INTC2 types of IRQs. + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009 - 2012 Paul Mundt + * + * Based on intc2.c and ipr.c + * + * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi + * Copyright (C) 2000 Kazumoto Kojima + * Copyright (C) 2001 David J. Mckay (david.mckay@st.com) + * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp> + * Copyright (C) 2005, 2006 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#define pr_fmt(fmt) "intc: " fmt + +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/interrupt.h> +#include <linux/sh_intc.h> +#include <linux/irqdomain.h> +#include <linux/device.h> +#include <linux/syscore_ops.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/radix-tree.h> +#include <linux/export.h> +#include <linux/sort.h> +#include "internals.h" + +LIST_HEAD(intc_list); +DEFINE_RAW_SPINLOCK(intc_big_lock); +static unsigned int nr_intc_controllers; + +/* + * Default priority level + * - this needs to be at least 2 for 5-bit priorities on 7780 + */ +static unsigned int default_prio_level = 2; /* 2 - 16 */ +static unsigned int intc_prio_level[INTC_NR_IRQS]; /* for now */ + +unsigned int intc_get_dfl_prio_level(void) +{ + return default_prio_level; +} + +unsigned int intc_get_prio_level(unsigned int irq) +{ + return intc_prio_level[irq]; +} + +void intc_set_prio_level(unsigned int irq, unsigned int level) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&intc_big_lock, flags); + intc_prio_level[irq] = level; + raw_spin_unlock_irqrestore(&intc_big_lock, flags); +} + +static void intc_redirect_irq(struct irq_desc *desc) +{ + generic_handle_irq((unsigned int)irq_desc_get_handler_data(desc)); +} + +static void __init intc_register_irq(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, + unsigned int irq) +{ + struct intc_handle_int *hp; + struct irq_data *irq_data; + unsigned int data[2], primary; + unsigned long flags; + + raw_spin_lock_irqsave(&intc_big_lock, flags); + radix_tree_insert(&d->tree, enum_id, intc_irq_xlate_get(irq)); + raw_spin_unlock_irqrestore(&intc_big_lock, flags); + + /* + * Prefer single interrupt source bitmap over other combinations: + * + * 1. bitmap, single interrupt source + * 2. priority, single interrupt source + * 3. bitmap, multiple interrupt sources (groups) + * 4. priority, multiple interrupt sources (groups) + */ + data[0] = intc_get_mask_handle(desc, d, enum_id, 0); + data[1] = intc_get_prio_handle(desc, d, enum_id, 0); + + primary = 0; + if (!data[0] && data[1]) + primary = 1; + + if (!data[0] && !data[1]) + pr_warning("missing unique irq mask for irq %d (vect 0x%04x)\n", + irq, irq2evt(irq)); + + data[0] = data[0] ? data[0] : intc_get_mask_handle(desc, d, enum_id, 1); + data[1] = data[1] ? data[1] : intc_get_prio_handle(desc, d, enum_id, 1); + + if (!data[primary]) + primary ^= 1; + + BUG_ON(!data[primary]); /* must have primary masking method */ + + irq_data = irq_get_irq_data(irq); + + disable_irq_nosync(irq); + irq_set_chip_and_handler_name(irq, &d->chip, handle_level_irq, + "level"); + irq_set_chip_data(irq, (void *)data[primary]); + + /* + * set priority level + */ + intc_set_prio_level(irq, intc_get_dfl_prio_level()); + + /* enable secondary masking method if present */ + if (data[!primary]) + _intc_enable(irq_data, data[!primary]); + + /* add irq to d->prio list if priority is available */ + if (data[1]) { + hp = d->prio + d->nr_prio; + hp->irq = irq; + hp->handle = data[1]; + + if (primary) { + /* + * only secondary priority should access registers, so + * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority() + */ + hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0); + hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0); + } + d->nr_prio++; + } + + /* add irq to d->sense list if sense is available */ + data[0] = intc_get_sense_handle(desc, d, enum_id); + if (data[0]) { + (d->sense + d->nr_sense)->irq = irq; + (d->sense + d->nr_sense)->handle = data[0]; + d->nr_sense++; + } + + /* irq should be disabled by default */ + d->chip.irq_mask(irq_data); + + intc_set_ack_handle(irq, desc, d, enum_id); + intc_set_dist_handle(irq, desc, d, enum_id); + + activate_irq(irq); +} + +static unsigned int __init save_reg(struct intc_desc_int *d, + unsigned int cnt, + unsigned long value, + unsigned int smp) +{ + if (value) { + value = intc_phys_to_virt(d, value); + + d->reg[cnt] = value; +#ifdef CONFIG_SMP + d->smp[cnt] = smp; +#endif + return 1; + } + + return 0; +} + +int __init register_intc_controller(struct intc_desc *desc) +{ + unsigned int i, k, smp; + struct intc_hw_desc *hw = &desc->hw; + struct intc_desc_int *d; + struct resource *res; + + pr_info("Registered controller '%s' with %u IRQs\n", + desc->name, hw->nr_vectors); + + d = kzalloc(sizeof(*d), GFP_NOWAIT); + if (!d) + goto err0; + + INIT_LIST_HEAD(&d->list); + list_add_tail(&d->list, &intc_list); + + raw_spin_lock_init(&d->lock); + INIT_RADIX_TREE(&d->tree, GFP_ATOMIC); + + d->index = nr_intc_controllers; + + if (desc->num_resources) { + d->nr_windows = desc->num_resources; + d->window = kcalloc(d->nr_windows, sizeof(*d->window), + GFP_NOWAIT); + if (!d->window) + goto err1; + + for (k = 0; k < d->nr_windows; k++) { + res = desc->resource + k; + WARN_ON(resource_type(res) != IORESOURCE_MEM); + d->window[k].phys = res->start; + d->window[k].size = resource_size(res); + d->window[k].virt = ioremap_nocache(res->start, + resource_size(res)); + if (!d->window[k].virt) + goto err2; + } + } + + d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0; +#ifdef CONFIG_INTC_BALANCING + if (d->nr_reg) + d->nr_reg += hw->nr_mask_regs; +#endif + d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0; + d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0; + d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0; + d->nr_reg += hw->subgroups ? hw->nr_subgroups : 0; + + d->reg = kcalloc(d->nr_reg, sizeof(*d->reg), GFP_NOWAIT); + if (!d->reg) + goto err2; + +#ifdef CONFIG_SMP + d->smp = kcalloc(d->nr_reg, sizeof(*d->smp), GFP_NOWAIT); + if (!d->smp) + goto err3; +#endif + k = 0; + + if (hw->mask_regs) { + for (i = 0; i < hw->nr_mask_regs; i++) { + smp = IS_SMP(hw->mask_regs[i]); + k += save_reg(d, k, hw->mask_regs[i].set_reg, smp); + k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp); +#ifdef CONFIG_INTC_BALANCING + k += save_reg(d, k, hw->mask_regs[i].dist_reg, 0); +#endif + } + } + + if (hw->prio_regs) { + d->prio = kcalloc(hw->nr_vectors, sizeof(*d->prio), + GFP_NOWAIT); + if (!d->prio) + goto err4; + + for (i = 0; i < hw->nr_prio_regs; i++) { + smp = IS_SMP(hw->prio_regs[i]); + k += save_reg(d, k, hw->prio_regs[i].set_reg, smp); + k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp); + } + + sort(d->prio, hw->nr_prio_regs, sizeof(*d->prio), + intc_handle_int_cmp, NULL); + } + + if (hw->sense_regs) { + d->sense = kcalloc(hw->nr_vectors, sizeof(*d->sense), + GFP_NOWAIT); + if (!d->sense) + goto err5; + + for (i = 0; i < hw->nr_sense_regs; i++) + k += save_reg(d, k, hw->sense_regs[i].reg, 0); + + sort(d->sense, hw->nr_sense_regs, sizeof(*d->sense), + intc_handle_int_cmp, NULL); + } + + if (hw->subgroups) + for (i = 0; i < hw->nr_subgroups; i++) + if (hw->subgroups[i].reg) + k+= save_reg(d, k, hw->subgroups[i].reg, 0); + + memcpy(&d->chip, &intc_irq_chip, sizeof(struct irq_chip)); + d->chip.name = desc->name; + + if (hw->ack_regs) + for (i = 0; i < hw->nr_ack_regs; i++) + k += save_reg(d, k, hw->ack_regs[i].set_reg, 0); + else + d->chip.irq_mask_ack = d->chip.irq_disable; + + /* disable bits matching force_disable before registering irqs */ + if (desc->force_disable) + intc_enable_disable_enum(desc, d, desc->force_disable, 0); + + /* disable bits matching force_enable before registering irqs */ + if (desc->force_enable) + intc_enable_disable_enum(desc, d, desc->force_enable, 0); + + BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */ + + intc_irq_domain_init(d, hw); + + /* register the vectors one by one */ + for (i = 0; i < hw->nr_vectors; i++) { + struct intc_vect *vect = hw->vectors + i; + unsigned int irq = evt2irq(vect->vect); + int res; + + if (!vect->enum_id) + continue; + + res = irq_create_identity_mapping(d->domain, irq); + if (unlikely(res)) { + if (res == -EEXIST) { + res = irq_domain_associate(d->domain, irq, irq); + if (unlikely(res)) { + pr_err("domain association failure\n"); + continue; + } + } else { + pr_err("can't identity map IRQ %d\n", irq); + continue; + } + } + + intc_irq_xlate_set(irq, vect->enum_id, d); + intc_register_irq(desc, d, vect->enum_id, irq); + + for (k = i + 1; k < hw->nr_vectors; k++) { + struct intc_vect *vect2 = hw->vectors + k; + unsigned int irq2 = evt2irq(vect2->vect); + + if (vect->enum_id != vect2->enum_id) + continue; + + /* + * In the case of multi-evt handling and sparse + * IRQ support, each vector still needs to have + * its own backing irq_desc. + */ + res = irq_create_identity_mapping(d->domain, irq2); + if (unlikely(res)) { + if (res == -EEXIST) { + res = irq_domain_associate(d->domain, + irq2, irq2); + if (unlikely(res)) { + pr_err("domain association " + "failure\n"); + continue; + } + } else { + pr_err("can't identity map IRQ %d\n", + irq); + continue; + } + } + + vect2->enum_id = 0; + + /* redirect this interrupts to the first one */ + irq_set_chip(irq2, &dummy_irq_chip); + irq_set_chained_handler_and_data(irq2, + intc_redirect_irq, + (void *)irq); + } + } + + intc_subgroup_init(desc, d); + + /* enable bits matching force_enable after registering irqs */ + if (desc->force_enable) + intc_enable_disable_enum(desc, d, desc->force_enable, 1); + + d->skip_suspend = desc->skip_syscore_suspend; + + nr_intc_controllers++; + + return 0; +err5: + kfree(d->prio); +err4: +#ifdef CONFIG_SMP + kfree(d->smp); +err3: +#endif + kfree(d->reg); +err2: + for (k = 0; k < d->nr_windows; k++) + if (d->window[k].virt) + iounmap(d->window[k].virt); + + kfree(d->window); +err1: + kfree(d); +err0: + pr_err("unable to allocate INTC memory\n"); + + return -ENOMEM; +} + +static int intc_suspend(void) +{ + struct intc_desc_int *d; + + list_for_each_entry(d, &intc_list, list) { + int irq; + + if (d->skip_suspend) + continue; + + /* enable wakeup irqs belonging to this intc controller */ + for_each_active_irq(irq) { + struct irq_data *data; + struct irq_chip *chip; + + data = irq_get_irq_data(irq); + chip = irq_data_get_irq_chip(data); + if (chip != &d->chip) + continue; + if (irqd_is_wakeup_set(data)) + chip->irq_enable(data); + } + } + return 0; +} + +static void intc_resume(void) +{ + struct intc_desc_int *d; + + list_for_each_entry(d, &intc_list, list) { + int irq; + + if (d->skip_suspend) + continue; + + for_each_active_irq(irq) { + struct irq_data *data; + struct irq_chip *chip; + + data = irq_get_irq_data(irq); + chip = irq_data_get_irq_chip(data); + /* + * This will catch the redirect and VIRQ cases + * due to the dummy_irq_chip being inserted. + */ + if (chip != &d->chip) + continue; + if (irqd_irq_disabled(data)) + chip->irq_disable(data); + else + chip->irq_enable(data); + } + } +} + +struct syscore_ops intc_syscore_ops = { + .suspend = intc_suspend, + .resume = intc_resume, +}; + +struct bus_type intc_subsys = { + .name = "intc", + .dev_name = "intc", +}; + +static ssize_t +show_intc_name(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct intc_desc_int *d; + + d = container_of(dev, struct intc_desc_int, dev); + + return sprintf(buf, "%s\n", d->chip.name); +} + +static DEVICE_ATTR(name, S_IRUGO, show_intc_name, NULL); + +static int __init register_intc_devs(void) +{ + struct intc_desc_int *d; + int error; + + register_syscore_ops(&intc_syscore_ops); + + error = subsys_system_register(&intc_subsys, NULL); + if (!error) { + list_for_each_entry(d, &intc_list, list) { + d->dev.id = d->index; + d->dev.bus = &intc_subsys; + error = device_register(&d->dev); + if (error == 0) + error = device_create_file(&d->dev, + &dev_attr_name); + if (error) + break; + } + } + + if (error) + pr_err("device registration error\n"); + + return error; +} +device_initcall(register_intc_devs); |