diff options
Diffstat (limited to 'drivers/sh/intc')
| -rw-r--r-- | drivers/sh/intc/Kconfig | 35 | ||||
| -rw-r--r-- | drivers/sh/intc/Makefile | 5 | ||||
| -rw-r--r-- | drivers/sh/intc/access.c | 237 | ||||
| -rw-r--r-- | drivers/sh/intc/balancing.c | 97 | ||||
| -rw-r--r-- | drivers/sh/intc/chip.c | 215 | ||||
| -rw-r--r-- | drivers/sh/intc/core.c | 469 | ||||
| -rw-r--r-- | drivers/sh/intc/dynamic.c | 135 | ||||
| -rw-r--r-- | drivers/sh/intc/handle.c | 307 | ||||
| -rw-r--r-- | drivers/sh/intc/internals.h | 186 | ||||
| -rw-r--r-- | drivers/sh/intc/userimask.c | 83 | ||||
| -rw-r--r-- | drivers/sh/intc/virq-debugfs.c | 64 | ||||
| -rw-r--r-- | drivers/sh/intc/virq.c | 255 |
12 files changed, 2088 insertions, 0 deletions
diff --git a/drivers/sh/intc/Kconfig b/drivers/sh/intc/Kconfig new file mode 100644 index 0000000..c88cbcc --- /dev/null +++ b/drivers/sh/intc/Kconfig @@ -0,0 +1,35 @@ +comment "Interrupt controller options" + +config INTC_USERIMASK + bool "Userspace interrupt masking support" + depends on ARCH_SHMOBILE || (SUPERH && CPU_SH4A) + help + This enables support for hardware-assisted userspace hardirq + masking. + + SH-4A and newer interrupt blocks all support a special shadowed + page with all non-masking registers obscured when mapped in to + userspace. This is primarily for use by userspace device + drivers that are using special priority levels. + + If in doubt, say N. + +config INTC_BALANCING + bool "Hardware IRQ balancing support" + depends on SMP && SUPERH && CPU_SHX3 + help + This enables support for IRQ auto-distribution mode on SH-X3 + SMP parts. All of the balancing and CPU wakeup decisions are + taken care of automatically by hardware for distributed + vectors. + + If in doubt, say N. + +config INTC_MAPPING_DEBUG + bool "Expose IRQ to per-controller id mapping via debugfs" + depends on DEBUG_FS + help + This will create a debugfs entry for showing the relationship + between system IRQs and the per-controller id tables. + + If in doubt, say N. diff --git a/drivers/sh/intc/Makefile b/drivers/sh/intc/Makefile new file mode 100644 index 0000000..bb5df86 --- /dev/null +++ b/drivers/sh/intc/Makefile @@ -0,0 +1,5 @@ +obj-y := access.o chip.o core.o dynamic.o handle.o virq.o + +obj-$(CONFIG_INTC_BALANCING) += balancing.o +obj-$(CONFIG_INTC_USERIMASK) += userimask.o +obj-$(CONFIG_INTC_MAPPING_DEBUG) += virq-debugfs.o diff --git a/drivers/sh/intc/access.c b/drivers/sh/intc/access.c new file mode 100644 index 0000000..f892ae1 --- /dev/null +++ b/drivers/sh/intc/access.c @@ -0,0 +1,237 @@ +/* + * Common INTC2 register accessors + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009, 2010 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. + */ +#include <linux/io.h> +#include "internals.h" + +unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address) +{ + struct intc_window *window; + int k; + + /* scan through physical windows and convert address */ + for (k = 0; k < d->nr_windows; k++) { + window = d->window + k; + + if (address < window->phys) + continue; + + if (address >= (window->phys + window->size)) + continue; + + address -= window->phys; + address += (unsigned long)window->virt; + + return address; + } + + /* no windows defined, register must be 1:1 mapped virt:phys */ + return address; +} + +unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address) +{ + unsigned int k; + + address = intc_phys_to_virt(d, address); + + for (k = 0; k < d->nr_reg; k++) { + if (d->reg[k] == address) + return k; + } + + BUG(); + return 0; +} + +unsigned int intc_set_field_from_handle(unsigned int value, + unsigned int field_value, + unsigned int handle) +{ + unsigned int width = _INTC_WIDTH(handle); + unsigned int shift = _INTC_SHIFT(handle); + + value &= ~(((1 << width) - 1) << shift); + value |= field_value << shift; + return value; +} + +unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle) +{ + unsigned int width = _INTC_WIDTH(handle); + unsigned int shift = _INTC_SHIFT(handle); + unsigned int mask = ((1 << width) - 1) << shift; + + return (value & mask) >> shift; +} + +static unsigned long test_8(unsigned long addr, unsigned long h, + unsigned long ignore) +{ + return intc_get_field_from_handle(__raw_readb(addr), h); +} + +static unsigned long test_16(unsigned long addr, unsigned long h, + unsigned long ignore) +{ + return intc_get_field_from_handle(__raw_readw(addr), h); +} + +static unsigned long test_32(unsigned long addr, unsigned long h, + unsigned long ignore) +{ + return intc_get_field_from_handle(__raw_readl(addr), h); +} + +static unsigned long write_8(unsigned long addr, unsigned long h, + unsigned long data) +{ + __raw_writeb(intc_set_field_from_handle(0, data, h), addr); + (void)__raw_readb(addr); /* Defeat write posting */ + return 0; +} + +static unsigned long write_16(unsigned long addr, unsigned long h, + unsigned long data) +{ + __raw_writew(intc_set_field_from_handle(0, data, h), addr); + (void)__raw_readw(addr); /* Defeat write posting */ + return 0; +} + +static unsigned long write_32(unsigned long addr, unsigned long h, + unsigned long data) +{ + __raw_writel(intc_set_field_from_handle(0, data, h), addr); + (void)__raw_readl(addr); /* Defeat write posting */ + return 0; +} + +static unsigned long modify_8(unsigned long addr, unsigned long h, + unsigned long data) +{ + unsigned long flags; + unsigned int value; + local_irq_save(flags); + value = intc_set_field_from_handle(__raw_readb(addr), data, h); + __raw_writeb(value, addr); + (void)__raw_readb(addr); /* Defeat write posting */ + local_irq_restore(flags); + return 0; +} + +static unsigned long modify_16(unsigned long addr, unsigned long h, + unsigned long data) +{ + unsigned long flags; + unsigned int value; + local_irq_save(flags); + value = intc_set_field_from_handle(__raw_readw(addr), data, h); + __raw_writew(value, addr); + (void)__raw_readw(addr); /* Defeat write posting */ + local_irq_restore(flags); + return 0; +} + +static unsigned long modify_32(unsigned long addr, unsigned long h, + unsigned long data) +{ + unsigned long flags; + unsigned int value; + local_irq_save(flags); + value = intc_set_field_from_handle(__raw_readl(addr), data, h); + __raw_writel(value, addr); + (void)__raw_readl(addr); /* Defeat write posting */ + local_irq_restore(flags); + return 0; +} + +static unsigned long intc_mode_field(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) +{ + return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1)); +} + +static unsigned long intc_mode_zero(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) +{ + return fn(addr, handle, 0); +} + +static unsigned long intc_mode_prio(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) +{ + return fn(addr, handle, intc_get_prio_level(irq)); +} + +unsigned long (*intc_reg_fns[])(unsigned long addr, + unsigned long h, + unsigned long data) = { + [REG_FN_TEST_BASE + 0] = test_8, + [REG_FN_TEST_BASE + 1] = test_16, + [REG_FN_TEST_BASE + 3] = test_32, + [REG_FN_WRITE_BASE + 0] = write_8, + [REG_FN_WRITE_BASE + 1] = write_16, + [REG_FN_WRITE_BASE + 3] = write_32, + [REG_FN_MODIFY_BASE + 0] = modify_8, + [REG_FN_MODIFY_BASE + 1] = modify_16, + [REG_FN_MODIFY_BASE + 3] = modify_32, +}; + +unsigned long (*intc_enable_fns[])(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) = { + [MODE_ENABLE_REG] = intc_mode_field, + [MODE_MASK_REG] = intc_mode_zero, + [MODE_DUAL_REG] = intc_mode_field, + [MODE_PRIO_REG] = intc_mode_prio, + [MODE_PCLR_REG] = intc_mode_prio, +}; + +unsigned long (*intc_disable_fns[])(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) = { + [MODE_ENABLE_REG] = intc_mode_zero, + [MODE_MASK_REG] = intc_mode_field, + [MODE_DUAL_REG] = intc_mode_field, + [MODE_PRIO_REG] = intc_mode_zero, + [MODE_PCLR_REG] = intc_mode_field, +}; + +unsigned long (*intc_enable_noprio_fns[])(unsigned long addr, + unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, + unsigned long), + unsigned int irq) = { + [MODE_ENABLE_REG] = intc_mode_field, + [MODE_MASK_REG] = intc_mode_zero, + [MODE_DUAL_REG] = intc_mode_field, + [MODE_PRIO_REG] = intc_mode_field, + [MODE_PCLR_REG] = intc_mode_field, +}; diff --git a/drivers/sh/intc/balancing.c b/drivers/sh/intc/balancing.c new file mode 100644 index 0000000..cec7a96 --- /dev/null +++ b/drivers/sh/intc/balancing.c @@ -0,0 +1,97 @@ +/* + * Support for hardware-managed IRQ auto-distribution. + * + * Copyright (C) 2010 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. + */ +#include "internals.h" + +static unsigned long dist_handle[NR_IRQS]; + +void intc_balancing_enable(unsigned int irq) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = dist_handle[irq]; + unsigned long addr; + + if (irq_balancing_disabled(irq) || !handle) + return; + + addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); + intc_reg_fns[_INTC_FN(handle)](addr, handle, 1); +} + +void intc_balancing_disable(unsigned int irq) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = dist_handle[irq]; + unsigned long addr; + + if (irq_balancing_disabled(irq) || !handle) + return; + + addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); + intc_reg_fns[_INTC_FN(handle)](addr, handle, 0); +} + +static unsigned int intc_dist_data(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id) +{ + struct intc_mask_reg *mr = desc->hw.mask_regs; + unsigned int i, j, fn, mode; + unsigned long reg_e, reg_d; + + for (i = 0; mr && enum_id && i < desc->hw.nr_mask_regs; i++) { + mr = desc->hw.mask_regs + i; + + /* + * Skip this entry if there's no auto-distribution + * register associated with it. + */ + if (!mr->dist_reg) + continue; + + for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) { + if (mr->enum_ids[j] != enum_id) + continue; + + fn = REG_FN_MODIFY_BASE; + mode = MODE_ENABLE_REG; + reg_e = mr->dist_reg; + reg_d = mr->dist_reg; + + fn += (mr->reg_width >> 3) - 1; + return _INTC_MK(fn, mode, + intc_get_reg(d, reg_e), + intc_get_reg(d, reg_d), + 1, + (mr->reg_width - 1) - j); + } + } + + /* + * It's possible we've gotten here with no distribution options + * available for the IRQ in question, so we just skip over those. + */ + return 0; +} + +void intc_set_dist_handle(unsigned int irq, struct intc_desc *desc, + struct intc_desc_int *d, intc_enum id) +{ + unsigned long flags; + + /* + * Nothing to do for this IRQ. + */ + if (!desc->hw.mask_regs) + return; + + raw_spin_lock_irqsave(&intc_big_lock, flags); + dist_handle[irq] = intc_dist_data(desc, d, id); + raw_spin_unlock_irqrestore(&intc_big_lock, flags); +} diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c new file mode 100644 index 0000000..35c0370 --- /dev/null +++ b/drivers/sh/intc/chip.c @@ -0,0 +1,215 @@ +/* + * IRQ chip definitions for INTC IRQs. + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009, 2010 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. + */ +#include <linux/cpumask.h> +#include <linux/io.h> +#include "internals.h" + +void _intc_enable(unsigned int irq, unsigned long handle) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long addr; + unsigned int cpu; + + for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) { +#ifdef CONFIG_SMP + if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity)) + continue; +#endif + addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu); + intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\ + [_INTC_FN(handle)], irq); + } + + intc_balancing_enable(irq); +} + +static void intc_enable(unsigned int irq) +{ + _intc_enable(irq, (unsigned long)get_irq_chip_data(irq)); +} + +static void intc_disable(unsigned int irq) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = (unsigned long)get_irq_chip_data(irq); + unsigned long addr; + unsigned int cpu; + + intc_balancing_disable(irq); + + for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) { +#ifdef CONFIG_SMP + if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity)) + continue; +#endif + addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu); + intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\ + [_INTC_FN(handle)], irq); + } +} + +static int intc_set_wake(unsigned int irq, unsigned int on) +{ + return 0; /* allow wakeup, but setup hardware in intc_suspend() */ +} + +#ifdef CONFIG_SMP +/* + * This is held with the irq desc lock held, so we don't require any + * additional locking here at the intc desc level. The affinity mask is + * later tested in the enable/disable paths. + */ +static int intc_set_affinity(unsigned int irq, const struct cpumask *cpumask) +{ + if (!cpumask_intersects(cpumask, cpu_online_mask)) + return -1; + + cpumask_copy(irq_to_desc(irq)->affinity, cpumask); + + return 0; +} +#endif + +static void intc_mask_ack(unsigned int irq) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = intc_get_ack_handle(irq); + unsigned long addr; + + intc_disable(irq); + + /* read register and write zero only to the associated bit */ + if (handle) { + unsigned int value; + + addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); + value = intc_set_field_from_handle(0, 1, handle); + + switch (_INTC_FN(handle)) { + case REG_FN_MODIFY_BASE + 0: /* 8bit */ + __raw_readb(addr); + __raw_writeb(0xff ^ value, addr); + break; + case REG_FN_MODIFY_BASE + 1: /* 16bit */ + __raw_readw(addr); + __raw_writew(0xffff ^ value, addr); + break; + case REG_FN_MODIFY_BASE + 3: /* 32bit */ + __raw_readl(addr); + __raw_writel(0xffffffff ^ value, addr); + break; + default: + BUG(); + break; + } + } +} + +static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp, + unsigned int nr_hp, + unsigned int irq) +{ + int i; + + /* + * this doesn't scale well, but... + * + * this function should only be used for cerain uncommon + * operations such as intc_set_priority() and intc_set_type() + * and in those rare cases performance doesn't matter that much. + * keeping the memory footprint low is more important. + * + * one rather simple way to speed this up and still keep the + * memory footprint down is to make sure the array is sorted + * and then perform a bisect to lookup the irq. + */ + for (i = 0; i < nr_hp; i++) { + if ((hp + i)->irq != irq) + continue; + + return hp + i; + } + + return NULL; +} + +int intc_set_priority(unsigned int irq, unsigned int prio) +{ + struct intc_desc_int *d = get_intc_desc(irq); + struct intc_handle_int *ihp; + + if (!intc_get_prio_level(irq) || prio <= 1) + return -EINVAL; + + ihp = intc_find_irq(d->prio, d->nr_prio, irq); + if (ihp) { + if (prio >= (1 << _INTC_WIDTH(ihp->handle))) + return -EINVAL; + + intc_set_prio_level(irq, prio); + + /* + * only set secondary masking method directly + * primary masking method is using intc_prio_level[irq] + * priority level will be set during next enable() + */ + if (_INTC_FN(ihp->handle) != REG_FN_ERR) + _intc_enable(irq, ihp->handle); + } + return 0; +} + +#define VALID(x) (x | 0x80) + +static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = { + [IRQ_TYPE_EDGE_FALLING] = VALID(0), + [IRQ_TYPE_EDGE_RISING] = VALID(1), + [IRQ_TYPE_LEVEL_LOW] = VALID(2), + /* SH7706, SH7707 and SH7709 do not support high level triggered */ +#if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \ + !defined(CONFIG_CPU_SUBTYPE_SH7707) && \ + !defined(CONFIG_CPU_SUBTYPE_SH7709) + [IRQ_TYPE_LEVEL_HIGH] = VALID(3), +#endif +}; + +static int intc_set_type(unsigned int irq, unsigned int type) +{ + struct intc_desc_int *d = get_intc_desc(irq); + unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK]; + struct intc_handle_int *ihp; + unsigned long addr; + + if (!value) + return -EINVAL; + + ihp = intc_find_irq(d->sense, d->nr_sense, irq); + if (ihp) { + addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0); + intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value); + } + + return 0; +} + +struct irq_chip intc_irq_chip = { + .mask = intc_disable, + .unmask = intc_enable, + .mask_ack = intc_mask_ack, + .enable = intc_enable, + .disable = intc_disable, + .shutdown = intc_disable, + .set_type = intc_set_type, + .set_wake = intc_set_wake, +#ifdef CONFIG_SMP + .set_affinity = intc_set_affinity, +#endif +}; diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c new file mode 100644 index 0000000..306ed28 --- /dev/null +++ b/drivers/sh/intc/core.c @@ -0,0 +1,469 @@ +/* + * Shared interrupt handling code for IPR and INTC2 types of IRQs. + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009, 2010 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/interrupt.h> +#include <linux/sh_intc.h> +#include <linux/sysdev.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/radix-tree.h> +#include "internals.h" + +LIST_HEAD(intc_list); +DEFINE_RAW_SPINLOCK(intc_big_lock); +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[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(unsigned int irq, struct irq_desc *desc) +{ + generic_handle_irq((unsigned int)get_irq_data(irq)); +} + +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; + unsigned int data[2], primary; + unsigned long flags; + + /* + * Register the IRQ position with the global IRQ map, then insert + * it in to the radix tree. + */ + reserve_irq_vector(irq); + + 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 */ + + disable_irq_nosync(irq); + set_irq_chip_and_handler_name(irq, &d->chip, + handle_level_irq, "level"); + set_irq_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[!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.mask(irq); + + 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); + + d->index = nr_intc_controllers; + + if (desc->num_resources) { + d->nr_windows = desc->num_resources; + d->window = kzalloc(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 = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT); + if (!d->reg) + goto err2; + +#ifdef CONFIG_SMP + d->smp = kzalloc(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 = kzalloc(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); + } + } + + if (hw->sense_regs) { + d->sense = kzalloc(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); + } + + 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.mask_ack = d->chip.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 */ + + /* 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); + struct irq_desc *irq_desc; + + if (!vect->enum_id) + continue; + + irq_desc = irq_to_desc_alloc_node(irq, numa_node_id()); + if (unlikely(!irq_desc)) { + pr_err("can't get irq_desc for %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. + */ + irq_desc = irq_to_desc_alloc_node(irq2, numa_node_id()); + if (unlikely(!irq_desc)) { + pr_err("can't get irq_desc for %d\n", irq2); + continue; + } + + vect2->enum_id = 0; + + /* redirect this interrupts to the first one */ + set_irq_chip(irq2, &dummy_irq_chip); + set_irq_chained_handler(irq2, intc_redirect_irq); + set_irq_data(irq2, (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); + + 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 ssize_t +show_intc_name(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) +{ + struct intc_desc_int *d; + + d = container_of(dev, struct intc_desc_int, sysdev); + + return sprintf(buf, "%s\n", d->chip.name); +} + +static SYSDEV_ATTR(name, S_IRUGO, show_intc_name, NULL); + +static int intc_suspend(struct sys_device *dev, pm_message_t state) +{ + struct intc_desc_int *d; + struct irq_desc *desc; + int irq; + + /* get intc controller associated with this sysdev */ + d = container_of(dev, struct intc_desc_int, sysdev); + + switch (state.event) { + case PM_EVENT_ON: + if (d->state.event != PM_EVENT_FREEZE) + break; + + for_each_irq_desc(irq, desc) { + /* + * This will catch the redirect and VIRQ cases + * due to the dummy_irq_chip being inserted. + */ + if (desc->chip != &d->chip) + continue; + if (desc->status & IRQ_DISABLED) + desc->chip->disable(irq); + else + desc->chip->enable(irq); + } + break; + case PM_EVENT_FREEZE: + /* nothing has to be done */ + break; + case PM_EVENT_SUSPEND: + /* enable wakeup irqs belonging to this intc controller */ + for_each_irq_desc(irq, desc) { + if (desc->chip != &d->chip) + continue; + if ((desc->status & IRQ_WAKEUP)) + desc->chip->enable(irq); + } + break; + } + + d->state = state; + + return 0; +} + +static int intc_resume(struct sys_device *dev) +{ + return intc_suspend(dev, PMSG_ON); +} + +struct sysdev_class intc_sysdev_class = { + .name = "intc", + .suspend = intc_suspend, + .resume = intc_resume, +}; + +/* register this intc as sysdev to allow suspend/resume */ +static int __init register_intc_sysdevs(void) +{ + struct intc_desc_int *d; + int error; + + error = sysdev_class_register(&intc_sysdev_class); + if (!error) { + list_for_each_entry(d, &intc_list, list) { + d->sysdev.id = d->index; + d->sysdev.cls = &intc_sysdev_class; + error = sysdev_register(&d->sysdev); + if (error == 0) + error = sysdev_create_file(&d->sysdev, + &attr_name); + if (error) + break; + } + } + + if (error) + pr_err("sysdev registration error\n"); + + return error; +} +device_initcall(register_intc_sysdevs); diff --git a/drivers/sh/intc/dynamic.c b/drivers/sh/intc/dynamic.c new file mode 100644 index 0000000..6caecdf --- /dev/null +++ b/drivers/sh/intc/dynamic.c @@ -0,0 +1,135 @@ +/* + * Dynamic IRQ management + * + * Copyright (C) 2010 Paul Mundt + * + * Modelled after arch/x86/kernel/apic/io_apic.c + * + * 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/irq.h> +#include <linux/bitmap.h> +#include <linux/spinlock.h> +#include "internals.h" /* only for activate_irq() damage.. */ + +/* + * The intc_irq_map provides a global map of bound IRQ vectors for a + * given platform. Allocation of IRQs are either static through the CPU + * vector map, or dynamic in the case of board mux vectors or MSI. + * + * As this is a central point for all IRQ controllers on the system, + * each of the available sources are mapped out here. This combined with + * sparseirq makes it quite trivial to keep the vector map tightly packed + * when dynamically creating IRQs, as well as tying in to otherwise + * unused irq_desc positions in the sparse array. + */ +static DECLARE_BITMAP(intc_irq_map, NR_IRQS); +static DEFINE_RAW_SPINLOCK(vector_lock); + +/* + * Dynamic IRQ allocation and deallocation + */ +unsigned int create_irq_nr(unsigned int irq_want, int node) +{ + unsigned int irq = 0, new; + unsigned long flags; + struct irq_desc *desc; + + raw_spin_lock_irqsave(&vector_lock, flags); + + /* + * First try the wanted IRQ + */ + if (test_and_set_bit(irq_want, intc_irq_map) == 0) { + new = irq_want; + } else { + /* .. then fall back to scanning. */ + new = find_first_zero_bit(intc_irq_map, nr_irqs); + if (unlikely(new == nr_irqs)) + goto out_unlock; + + __set_bit(new, intc_irq_map); + } + + desc = irq_to_desc_alloc_node(new, node); + if (unlikely(!desc)) { + pr_err("can't get irq_desc for %d\n", new); + goto out_unlock; + } + + desc = move_irq_desc(desc, node); + irq = new; + +out_unlock: + raw_spin_unlock_irqrestore(&vector_lock, flags); + + if (irq > 0) { + dynamic_irq_init(irq); + activate_irq(irq); + } + + return irq; +} + +int create_irq(void) +{ + int nid = cpu_to_node(smp_processor_id()); + int irq; + + irq = create_irq_nr(NR_IRQS_LEGACY, nid); + if (irq == 0) + irq = -1; + + return irq; +} + +void destroy_irq(unsigned int irq) +{ + unsigned long flags; + + dynamic_irq_cleanup(irq); + + raw_spin_lock_irqsave(&vector_lock, flags); + __clear_bit(irq, intc_irq_map); + raw_spin_unlock_irqrestore(&vector_lock, flags); +} + +int reserve_irq_vector(unsigned int irq) +{ + unsigned long flags; + int ret = 0; + + raw_spin_lock_irqsave(&vector_lock, flags); + if (test_and_set_bit(irq, intc_irq_map)) + ret = -EBUSY; + raw_spin_unlock_irqrestore(&vector_lock, flags); + + return ret; +} + +void reserve_intc_vectors(struct intc_vect *vectors, unsigned int nr_vecs) +{ + unsigned long flags; + int i; + + raw_spin_lock_irqsave(&vector_lock, flags); + for (i = 0; i < nr_vecs; i++) + __set_bit(evt2irq(vectors[i].vect), intc_irq_map); + raw_spin_unlock_irqrestore(&vector_lock, flags); +} + +void reserve_irq_legacy(void) +{ + unsigned long flags; + int i, j; + + raw_spin_lock_irqsave(&vector_lock, flags); + j = find_first_bit(intc_irq_map, nr_irqs); + for (i = 0; i < j; i++) + __set_bit(i, intc_irq_map); + raw_spin_unlock_irqrestore(&vector_lock, flags); +} diff --git a/drivers/sh/intc/handle.c b/drivers/sh/intc/handle.c new file mode 100644 index 0000000..057ce56 --- /dev/null +++ b/drivers/sh/intc/handle.c @@ -0,0 +1,307 @@ +/* + * Shared interrupt handling code for IPR and INTC2 types of IRQs. + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009, 2010 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. + */ +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/spinlock.h> +#include "internals.h" + +static unsigned long ack_handle[NR_IRQS]; + +static intc_enum __init intc_grp_id(struct intc_desc *desc, + intc_enum enum_id) +{ + struct intc_group *g = desc->hw.groups; + unsigned int i, j; + + for (i = 0; g && enum_id && i < desc->hw.nr_groups; i++) { + g = desc->hw.groups + i; + + for (j = 0; g->enum_ids[j]; j++) { + if (g->enum_ids[j] != enum_id) + continue; + + return g->enum_id; + } + } + + return 0; +} + +static unsigned int __init _intc_mask_data(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, + unsigned int *reg_idx, + unsigned int *fld_idx) +{ + struct intc_mask_reg *mr = desc->hw.mask_regs; + unsigned int fn, mode; + unsigned long reg_e, reg_d; + + while (mr && enum_id && *reg_idx < desc->hw.nr_mask_regs) { + mr = desc->hw.mask_regs + *reg_idx; + + for (; *fld_idx < ARRAY_SIZE(mr->enum_ids); (*fld_idx)++) { + if (mr->enum_ids[*fld_idx] != enum_id) + continue; + + if (mr->set_reg && mr->clr_reg) { + fn = REG_FN_WRITE_BASE; + mode = MODE_DUAL_REG; + reg_e = mr->clr_reg; + reg_d = mr->set_reg; + } else { + fn = REG_FN_MODIFY_BASE; + if (mr->set_reg) { + mode = MODE_ENABLE_REG; + reg_e = mr->set_reg; + reg_d = mr->set_reg; + } else { + mode = MODE_MASK_REG; + reg_e = mr->clr_reg; + reg_d = mr->clr_reg; + } + } + + fn += (mr->reg_width >> 3) - 1; + return _INTC_MK(fn, mode, + intc_get_reg(d, reg_e), + intc_get_reg(d, reg_d), + 1, + (mr->reg_width - 1) - *fld_idx); + } + + *fld_idx = 0; + (*reg_idx)++; + } + + return 0; +} + +unsigned int __init +intc_get_mask_handle(struct intc_desc *desc, struct intc_desc_int *d, + intc_enum enum_id, int do_grps) +{ + unsigned int i = 0; + unsigned int j = 0; + unsigned int ret; + + ret = _intc_mask_data(desc, d, enum_id, &i, &j); + if (ret) + return ret; + + if (do_grps) + return intc_get_mask_handle(desc, d, intc_grp_id(desc, enum_id), 0); + + return 0; +} + +static unsigned int __init _intc_prio_data(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, + unsigned int *reg_idx, + unsigned int *fld_idx) +{ + struct intc_prio_reg *pr = desc->hw.prio_regs; + unsigned int fn, n, mode, bit; + unsigned long reg_e, reg_d; + + while (pr && enum_id && *reg_idx < desc->hw.nr_prio_regs) { + pr = desc->hw.prio_regs + *reg_idx; + + for (; *fld_idx < ARRAY_SIZE(pr->enum_ids); (*fld_idx)++) { + if (pr->enum_ids[*fld_idx] != enum_id) + continue; + + if (pr->set_reg && pr->clr_reg) { + fn = REG_FN_WRITE_BASE; + mode = MODE_PCLR_REG; + reg_e = pr->set_reg; + reg_d = pr->clr_reg; + } else { + fn = REG_FN_MODIFY_BASE; + mode = MODE_PRIO_REG; + if (!pr->set_reg) + BUG(); + reg_e = pr->set_reg; + reg_d = pr->set_reg; + } + + fn += (pr->reg_width >> 3) - 1; + n = *fld_idx + 1; + + BUG_ON(n * pr->field_width > pr->reg_width); + + bit = pr->reg_width - (n * pr->field_width); + + return _INTC_MK(fn, mode, + intc_get_reg(d, reg_e), + intc_get_reg(d, reg_d), + pr->field_width, bit); + } + + *fld_idx = 0; + (*reg_idx)++; + } + + return 0; +} + +unsigned int __init +intc_get_prio_handle(struct intc_desc *desc, struct intc_desc_int *d, + intc_enum enum_id, int do_grps) +{ + unsigned int i = 0; + unsigned int j = 0; + unsigned int ret; + + ret = _intc_prio_data(desc, d, enum_id, &i, &j); + if (ret) + return ret; + + if (do_grps) + return intc_get_prio_handle(desc, d, intc_grp_id(desc, enum_id), 0); + + return 0; +} + +static unsigned int __init intc_ack_data(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id) +{ + struct intc_mask_reg *mr = desc->hw.ack_regs; + unsigned int i, j, fn, mode; + unsigned long reg_e, reg_d; + + for (i = 0; mr && enum_id && i < desc->hw.nr_ack_regs; i++) { + mr = desc->hw.ack_regs + i; + + for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) { + if (mr->enum_ids[j] != enum_id) + continue; + + fn = REG_FN_MODIFY_BASE; + mode = MODE_ENABLE_REG; + reg_e = mr->set_reg; + reg_d = mr->set_reg; + + fn += (mr->reg_width >> 3) - 1; + return _INTC_MK(fn, mode, + intc_get_reg(d, reg_e), + intc_get_reg(d, reg_d), + 1, + (mr->reg_width - 1) - j); + } + } + + return 0; +} + +static void intc_enable_disable(struct intc_desc_int *d, + unsigned long handle, int do_enable) +{ + unsigned long addr; + unsigned int cpu; + unsigned long (*fn)(unsigned long, unsigned long, + unsigned long (*)(unsigned long, unsigned long, + unsigned long), + unsigned int); + + if (do_enable) { + for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) { + addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu); + fn = intc_enable_noprio_fns[_INTC_MODE(handle)]; + fn(addr, handle, intc_reg_fns[_INTC_FN(handle)], 0); + } + } else { + for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) { + addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu); + fn = intc_disable_fns[_INTC_MODE(handle)]; + fn(addr, handle, intc_reg_fns[_INTC_FN(handle)], 0); + } + } +} + +void __init intc_enable_disable_enum(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, int enable) +{ + unsigned int i, j, data; + + /* go through and enable/disable all mask bits */ + i = j = 0; + do { + data = _intc_mask_data(desc, d, enum_id, &i, &j); + if (data) + intc_enable_disable(d, data, enable); + j++; + } while (data); + + /* go through and enable/disable all priority fields */ + i = j = 0; + do { + data = _intc_prio_data(desc, d, enum_id, &i, &j); + if (data) + intc_enable_disable(d, data, enable); + + j++; + } while (data); +} + +unsigned int __init +intc_get_sense_handle(struct intc_desc *desc, struct intc_desc_int *d, + intc_enum enum_id) +{ + struct intc_sense_reg *sr = desc->hw.sense_regs; + unsigned int i, j, fn, bit; + + for (i = 0; sr && enum_id && i < desc->hw.nr_sense_regs; i++) { + sr = desc->hw.sense_regs + i; + + for (j = 0; j < ARRAY_SIZE(sr->enum_ids); j++) { + if (sr->enum_ids[j] != enum_id) + continue; + + fn = REG_FN_MODIFY_BASE; + fn += (sr->reg_width >> 3) - 1; + + BUG_ON((j + 1) * sr->field_width > sr->reg_width); + + bit = sr->reg_width - ((j + 1) * sr->field_width); + + return _INTC_MK(fn, 0, intc_get_reg(d, sr->reg), + 0, sr->field_width, bit); + } + } + + return 0; +} + + +void intc_set_ack_handle(unsigned int irq, struct intc_desc *desc, + struct intc_desc_int *d, intc_enum id) +{ + unsigned long flags; + + /* + * Nothing to do for this IRQ. + */ + if (!desc->hw.ack_regs) + return; + + raw_spin_lock_irqsave(&intc_big_lock, flags); + ack_handle[irq] = intc_ack_data(desc, d, id); + raw_spin_unlock_irqrestore(&intc_big_lock, flags); +} + +unsigned long intc_get_ack_handle(unsigned int irq) +{ + return ack_handle[irq]; +} diff --git a/drivers/sh/intc/internals.h b/drivers/sh/intc/internals.h new file mode 100644 index 0000000..d49482c --- /dev/null +++ b/drivers/sh/intc/internals.h @@ -0,0 +1,186 @@ +#include <linux/sh_intc.h> +#include <linux/irq.h> +#include <linux/list.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/radix-tree.h> +#include <linux/sysdev.h> + +#define _INTC_MK(fn, mode, addr_e, addr_d, width, shift) \ + ((shift) | ((width) << 5) | ((fn) << 9) | ((mode) << 13) | \ + ((addr_e) << 16) | ((addr_d << 24))) + +#define _INTC_SHIFT(h) (h & 0x1f) +#define _INTC_WIDTH(h) ((h >> 5) & 0xf) +#define _INTC_FN(h) ((h >> 9) & 0xf) +#define _INTC_MODE(h) ((h >> 13) & 0x7) +#define _INTC_ADDR_E(h) ((h >> 16) & 0xff) +#define _INTC_ADDR_D(h) ((h >> 24) & 0xff) + +#ifdef CONFIG_SMP +#define IS_SMP(x) (x.smp) +#define INTC_REG(d, x, c) (d->reg[(x)] + ((d->smp[(x)] & 0xff) * c)) +#define SMP_NR(d, x) ((d->smp[(x)] >> 8) ? (d->smp[(x)] >> 8) : 1) +#else +#define IS_SMP(x) 0 +#define INTC_REG(d, x, c) (d->reg[(x)]) +#define SMP_NR(d, x) 1 +#endif + +struct intc_handle_int { + unsigned int irq; + unsigned long handle; +}; + +struct intc_window { + phys_addr_t phys; + void __iomem *virt; + unsigned long size; +}; + +struct intc_map_entry { + intc_enum enum_id; + struct intc_desc_int *desc; +}; + +struct intc_subgroup_entry { + unsigned int pirq; + intc_enum enum_id; + unsigned long handle; +}; + +struct intc_desc_int { + struct list_head list; + struct sys_device sysdev; + struct radix_tree_root tree; + pm_message_t state; + raw_spinlock_t lock; + unsigned int index; + unsigned long *reg; +#ifdef CONFIG_SMP + unsigned long *smp; +#endif + unsigned int nr_reg; + struct intc_handle_int *prio; + unsigned int nr_prio; + struct intc_handle_int *sense; + unsigned int nr_sense; + struct intc_window *window; + unsigned int nr_windows; + struct irq_chip chip; +}; + + +enum { + REG_FN_ERR = 0, + REG_FN_TEST_BASE = 1, + REG_FN_WRITE_BASE = 5, + REG_FN_MODIFY_BASE = 9 +}; + +enum { MODE_ENABLE_REG = 0, /* Bit(s) set -> interrupt enabled */ + MODE_MASK_REG, /* Bit(s) set -> interrupt disabled */ + MODE_DUAL_REG, /* Two registers, set bit to enable / disable */ + MODE_PRIO_REG, /* Priority value written to enable interrupt */ + MODE_PCLR_REG, /* Above plus all bits set to disable interrupt */ +}; + +static inline struct intc_desc_int *get_intc_desc(unsigned int irq) +{ + struct irq_chip *chip = get_irq_chip(irq); + + return container_of(chip, struct intc_desc_int, chip); +} + +/* + * Grumble. + */ +static inline void activate_irq(int irq) +{ +#ifdef CONFIG_ARM + /* ARM requires an extra step to clear IRQ_NOREQUEST, which it + * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE. + */ + set_irq_flags(irq, IRQF_VALID); +#else + /* same effect on other architectures */ + set_irq_noprobe(irq); +#endif +} + +/* access.c */ +extern unsigned long +(*intc_reg_fns[])(unsigned long addr, unsigned long h, unsigned long data); + +extern unsigned long +(*intc_enable_fns[])(unsigned long addr, unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, unsigned long), + unsigned int irq); +extern unsigned long +(*intc_disable_fns[])(unsigned long addr, unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, unsigned long), + unsigned int irq); +extern unsigned long +(*intc_enable_noprio_fns[])(unsigned long addr, unsigned long handle, + unsigned long (*fn)(unsigned long, + unsigned long, unsigned long), + unsigned int irq); + +unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address); +unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address); +unsigned int intc_set_field_from_handle(unsigned int value, + unsigned int field_value, + unsigned int handle); +unsigned long intc_get_field_from_handle(unsigned int value, + unsigned int handle); + +/* balancing.c */ +#ifdef CONFIG_INTC_BALANCING +void intc_balancing_enable(unsigned int irq); +void intc_balancing_disable(unsigned int irq); +void intc_set_dist_handle(unsigned int irq, struct intc_desc *desc, + struct intc_desc_int *d, intc_enum id); +#else +static inline void intc_balancing_enable(unsigned int irq) { } +static inline void intc_balancing_disable(unsigned int irq) { } +static inline void +intc_set_dist_handle(unsigned int irq, struct intc_desc *desc, + struct intc_desc_int *d, intc_enum id) { } +#endif + +/* chip.c */ +extern struct irq_chip intc_irq_chip; +void _intc_enable(unsigned int irq, unsigned long handle); + +/* core.c */ +extern struct list_head intc_list; +extern raw_spinlock_t intc_big_lock; +extern unsigned int nr_intc_controllers; +extern struct sysdev_class intc_sysdev_class; + +unsigned int intc_get_dfl_prio_level(void); +unsigned int intc_get_prio_level(unsigned int irq); +void intc_set_prio_level(unsigned int irq, unsigned int level); + +/* handle.c */ +unsigned int intc_get_mask_handle(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, int do_grps); +unsigned int intc_get_prio_handle(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id, int do_grps); +unsigned int intc_get_sense_handle(struct intc_desc *desc, + struct intc_desc_int *d, + intc_enum enum_id); +void intc_set_ack_handle(unsigned int irq, struct intc_desc *desc, + struct intc_desc_int *d, intc_enum id); +unsigned long intc_get_ack_handle(unsigned int irq); +void intc_enable_disable_enum(struct intc_desc *desc, struct intc_desc_int *d, + intc_enum enum_id, int enable); + +/* virq.c */ +void intc_subgroup_init(struct intc_desc *desc, struct intc_desc_int *d); +void intc_irq_xlate_set(unsigned int irq, intc_enum id, struct intc_desc_int *d); +struct intc_map_entry *intc_irq_xlate_get(unsigned int irq); diff --git a/drivers/sh/intc/userimask.c b/drivers/sh/intc/userimask.c new file mode 100644 index 0000000..e32304b --- /dev/null +++ b/drivers/sh/intc/userimask.c @@ -0,0 +1,83 @@ +/* + * Support for hardware-assisted userspace interrupt masking. + * + * Copyright (C) 2010 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/errno.h> +#include <linux/sysdev.h> +#include <linux/init.h> +#include <linux/io.h> +#include <asm/sizes.h> +#include "internals.h" + +static void __iomem *uimask; + +static ssize_t +show_intc_userimask(struct sysdev_class *cls, + struct sysdev_class_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf); +} + +static ssize_t +store_intc_userimask(struct sysdev_class *cls, + struct sysdev_class_attribute *attr, + const char *buf, size_t count) +{ + unsigned long level; + + level = simple_strtoul(buf, NULL, 10); + + /* + * Minimal acceptable IRQ levels are in the 2 - 16 range, but + * these are chomped so as to not interfere with normal IRQs. + * + * Level 1 is a special case on some CPUs in that it's not + * directly settable, but given that USERIMASK cuts off below a + * certain level, we don't care about this limitation here. + * Level 0 on the other hand equates to user masking disabled. + * + * We use the default priority level as a cut off so that only + * special case opt-in IRQs can be mangled. + */ + if (level >= intc_get_dfl_prio_level()) + return -EINVAL; + + __raw_writel(0xa5 << 24 | level << 4, uimask); + + return count; +} + +static SYSDEV_CLASS_ATTR(userimask, S_IRUSR | S_IWUSR, + show_intc_userimask, store_intc_userimask); + + +static int __init userimask_sysdev_init(void) +{ + if (unlikely(!uimask)) + return -ENXIO; + + return sysdev_class_create_file(&intc_sysdev_class, &attr_userimask); +} +late_initcall(userimask_sysdev_init); + +int register_intc_userimask(unsigned long addr) +{ + if (unlikely(uimask)) + return -EBUSY; + + uimask = ioremap_nocache(addr, SZ_4K); + if (unlikely(!uimask)) + return -ENOMEM; + + pr_info("userimask support registered for levels 0 -> %d\n", + intc_get_dfl_prio_level() - 1); + + return 0; +} diff --git a/drivers/sh/intc/virq-debugfs.c b/drivers/sh/intc/virq-debugfs.c new file mode 100644 index 0000000..9e62ba9 --- /dev/null +++ b/drivers/sh/intc/virq-debugfs.c @@ -0,0 +1,64 @@ +/* + * Support for virtual IRQ subgroups debugfs mapping. + * + * Copyright (C) 2010 Paul Mundt + * + * Modelled after arch/powerpc/kernel/irq.c. + * + * 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. + */ +#include <linux/seq_file.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/debugfs.h> +#include "internals.h" + +static int intc_irq_xlate_debug(struct seq_file *m, void *priv) +{ + int i; + + seq_printf(m, "%-5s %-7s %-15s\n", "irq", "enum", "chip name"); + + for (i = 1; i < nr_irqs; i++) { + struct intc_map_entry *entry = intc_irq_xlate_get(i); + struct intc_desc_int *desc = entry->desc; + + if (!desc) + continue; + + seq_printf(m, "%5d ", i); + seq_printf(m, "0x%05x ", entry->enum_id); + seq_printf(m, "%-15s\n", desc->chip.name); + } + + return 0; +} + +static int intc_irq_xlate_open(struct inode *inode, struct file *file) +{ + return single_open(file, intc_irq_xlate_debug, inode->i_private); +} + +static const struct file_operations intc_irq_xlate_fops = { + .open = intc_irq_xlate_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init intc_irq_xlate_init(void) +{ + /* + * XXX.. use arch_debugfs_dir here when all of the intc users are + * converted. + */ + if (debugfs_create_file("intc_irq_xlate", S_IRUGO, NULL, NULL, + &intc_irq_xlate_fops) == NULL) + return -ENOMEM; + + return 0; +} +fs_initcall(intc_irq_xlate_init); diff --git a/drivers/sh/intc/virq.c b/drivers/sh/intc/virq.c new file mode 100644 index 0000000..643dfd4 --- /dev/null +++ b/drivers/sh/intc/virq.c @@ -0,0 +1,255 @@ +/* + * Support for virtual IRQ subgroups. + * + * Copyright (C) 2010 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/slab.h> +#include <linux/irq.h> +#include <linux/list.h> +#include <linux/radix-tree.h> +#include <linux/spinlock.h> +#include "internals.h" + +static struct intc_map_entry intc_irq_xlate[NR_IRQS]; + +struct intc_virq_list { + unsigned int irq; + struct intc_virq_list *next; +}; + +#define for_each_virq(entry, head) \ + for (entry = head; entry; entry = entry->next) + +/* + * Tags for the radix tree + */ +#define INTC_TAG_VIRQ_NEEDS_ALLOC 0 + +void intc_irq_xlate_set(unsigned int irq, intc_enum id, struct intc_desc_int *d) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&intc_big_lock, flags); + intc_irq_xlate[irq].enum_id = id; + intc_irq_xlate[irq].desc = d; + raw_spin_unlock_irqrestore(&intc_big_lock, flags); +} + +struct intc_map_entry *intc_irq_xlate_get(unsigned int irq) +{ + return intc_irq_xlate + irq; +} + +int intc_irq_lookup(const char *chipname, intc_enum enum_id) +{ + struct intc_map_entry *ptr; + struct intc_desc_int *d; + int irq = -1; + + list_for_each_entry(d, &intc_list, list) { + int tagged; + + if (strcmp(d->chip.name, chipname) != 0) + continue; + + /* + * Catch early lookups for subgroup VIRQs that have not + * yet been allocated an IRQ. This already includes a + * fast-path out if the tree is untagged, so there is no + * need to explicitly test the root tree. + */ + tagged = radix_tree_tag_get(&d->tree, enum_id, + INTC_TAG_VIRQ_NEEDS_ALLOC); + if (unlikely(tagged)) + break; + + ptr = radix_tree_lookup(&d->tree, enum_id); + if (ptr) { + irq = ptr - intc_irq_xlate; + break; + } + } + + return irq; +} +EXPORT_SYMBOL_GPL(intc_irq_lookup); + +static int add_virq_to_pirq(unsigned int irq, unsigned int virq) +{ + struct intc_virq_list **last, *entry; + struct irq_desc *desc = irq_to_desc(irq); + + /* scan for duplicates */ + last = (struct intc_virq_list **)&desc->handler_data; + for_each_virq(entry, desc->handler_data) { + if (entry->irq == virq) + return 0; + last = &entry->next; + } + + entry = kzalloc(sizeof(struct intc_virq_list), GFP_ATOMIC); + if (!entry) { + pr_err("can't allocate VIRQ mapping for %d\n", virq); + return -ENOMEM; + } + + entry->irq = virq; + + *last = entry; + + return 0; +} + +static void intc_virq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct intc_virq_list *entry, *vlist = get_irq_data(irq); + struct intc_desc_int *d = get_intc_desc(irq); + + desc->chip->mask_ack(irq); + + for_each_virq(entry, vlist) { + unsigned long addr, handle; + + handle = (unsigned long)get_irq_data(entry->irq); + addr = INTC_REG(d, _INTC_ADDR_E(handle), 0); + + if (intc_reg_fns[_INTC_FN(handle)](addr, handle, 0)) + generic_handle_irq(entry->irq); + } + + desc->chip->unmask(irq); +} + +static unsigned long __init intc_subgroup_data(struct intc_subgroup *subgroup, + struct intc_desc_int *d, + unsigned int index) +{ + unsigned int fn = REG_FN_TEST_BASE + (subgroup->reg_width >> 3) - 1; + + return _INTC_MK(fn, MODE_ENABLE_REG, intc_get_reg(d, subgroup->reg), + 0, 1, (subgroup->reg_width - 1) - index); +} + +static void __init intc_subgroup_init_one(struct intc_desc *desc, + struct intc_desc_int *d, + struct intc_subgroup *subgroup) +{ + struct intc_map_entry *mapped; + unsigned int pirq; + unsigned long flags; + int i; + + mapped = radix_tree_lookup(&d->tree, subgroup->parent_id); + if (!mapped) { + WARN_ON(1); + return; + } + + pirq = mapped - intc_irq_xlate; + + raw_spin_lock_irqsave(&d->lock, flags); + + for (i = 0; i < ARRAY_SIZE(subgroup->enum_ids); i++) { + struct intc_subgroup_entry *entry; + int err; + + if (!subgroup->enum_ids[i]) + continue; + + entry = kmalloc(sizeof(*entry), GFP_NOWAIT); + if (!entry) + break; + + entry->pirq = pirq; + entry->enum_id = subgroup->enum_ids[i]; + entry->handle = intc_subgroup_data(subgroup, d, i); + + err = radix_tree_insert(&d->tree, entry->enum_id, entry); + if (unlikely(err < 0)) + break; + + radix_tree_tag_set(&d->tree, entry->enum_id, + INTC_TAG_VIRQ_NEEDS_ALLOC); + } + + raw_spin_unlock_irqrestore(&d->lock, flags); +} + +void __init intc_subgroup_init(struct intc_desc *desc, struct intc_desc_int *d) +{ + int i; + + if (!desc->hw.subgroups) + return; + + for (i = 0; i < desc->hw.nr_subgroups; i++) + intc_subgroup_init_one(desc, d, desc->hw.subgroups + i); +} + +static void __init intc_subgroup_map(struct intc_desc_int *d) +{ + struct intc_subgroup_entry *entries[32]; + unsigned long flags; + unsigned int nr_found; + int i; + + raw_spin_lock_irqsave(&d->lock, flags); + +restart: + nr_found = radix_tree_gang_lookup_tag_slot(&d->tree, + (void ***)entries, 0, ARRAY_SIZE(entries), + INTC_TAG_VIRQ_NEEDS_ALLOC); + + for (i = 0; i < nr_found; i++) { + struct intc_subgroup_entry *entry; + int irq; + + entry = radix_tree_deref_slot((void **)entries[i]); + if (unlikely(!entry)) + continue; + if (unlikely(entry == RADIX_TREE_RETRY)) + goto restart; + + irq = create_irq(); + if (unlikely(irq < 0)) { + pr_err("no more free IRQs, bailing..\n"); + break; + } + + pr_info("Setting up a chained VIRQ from %d -> %d\n", + irq, entry->pirq); + + intc_irq_xlate_set(irq, entry->enum_id, d); + + set_irq_chip_and_handler_name(irq, get_irq_chip(entry->pirq), + handle_simple_irq, "virq"); + set_irq_chip_data(irq, get_irq_chip_data(entry->pirq)); + + set_irq_data(irq, (void *)entry->handle); + + set_irq_chained_handler(entry->pirq, intc_virq_handler); + add_virq_to_pirq(entry->pirq, irq); + + radix_tree_tag_clear(&d->tree, entry->enum_id, + INTC_TAG_VIRQ_NEEDS_ALLOC); + radix_tree_replace_slot((void **)entries[i], + &intc_irq_xlate[irq]); + } + + raw_spin_unlock_irqrestore(&d->lock, flags); +} + +void __init intc_finalize(void) +{ + struct intc_desc_int *d; + + list_for_each_entry(d, &intc_list, list) + if (radix_tree_tagged(&d->tree, INTC_TAG_VIRQ_NEEDS_ALLOC)) + intc_subgroup_map(d); +} |