diff options
Diffstat (limited to 'kernel/drivers/sh/intc/chip.c')
| -rw-r--r-- | kernel/drivers/sh/intc/chip.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/kernel/drivers/sh/intc/chip.c b/kernel/drivers/sh/intc/chip.c new file mode 100644 index 000000000..46427b48e --- /dev/null +++ b/kernel/drivers/sh/intc/chip.c @@ -0,0 +1,211 @@ +/* + * IRQ chip definitions for INTC IRQs. + * + * Copyright (C) 2007, 2008 Magnus Damm + * Copyright (C) 2009 - 2012 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/bsearch.h> +#include <linux/io.h> +#include "internals.h" + +void _intc_enable(struct irq_data *data, unsigned long handle) +{ + unsigned int irq = data->irq; + 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, data->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(struct irq_data *data) +{ + _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data)); +} + +static void intc_disable(struct irq_data *data) +{ + unsigned int irq = data->irq; + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data); + 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, data->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); + } +} + +#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(struct irq_data *data, + const struct cpumask *cpumask, + bool force) +{ + if (!cpumask_intersects(cpumask, cpu_online_mask)) + return -1; + + cpumask_copy(data->affinity, cpumask); + + return IRQ_SET_MASK_OK_NOCOPY; +} +#endif + +static void intc_mask_ack(struct irq_data *data) +{ + unsigned int irq = data->irq; + struct intc_desc_int *d = get_intc_desc(irq); + unsigned long handle = intc_get_ack_handle(irq); + void __iomem *addr; + + intc_disable(data); + + /* read register and write zero only to the associated bit */ + if (handle) { + unsigned int value; + + addr = (void __iomem *)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) +{ + struct intc_handle_int key; + + key.irq = irq; + key.handle = 0; + + return bsearch(&key, hp, nr_hp, sizeof(*hp), intc_handle_int_cmp); +} + +int intc_set_priority(unsigned int irq, unsigned int prio) +{ + struct intc_desc_int *d = get_intc_desc(irq); + struct irq_data *data = irq_get_irq_data(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(data, ihp->handle); + } + return 0; +} + +#define SENSE_VALID_FLAG 0x80 +#define VALID(x) (x | SENSE_VALID_FLAG) + +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 +#if defined(CONFIG_ARM) /* all recent SH-Mobile / R-Mobile ARM support this */ + [IRQ_TYPE_EDGE_BOTH] = VALID(4), +#endif +}; + +static int intc_set_type(struct irq_data *data, unsigned int type) +{ + unsigned int irq = data->irq; + 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; + + value &= ~SENSE_VALID_FLAG; + + ihp = intc_find_irq(d->sense, d->nr_sense, irq); + if (ihp) { + /* PINT has 2-bit sense registers, should fail on EDGE_BOTH */ + if (value >= (1 << _INTC_WIDTH(ihp->handle))) + return -EINVAL; + + 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 = { + .irq_mask = intc_disable, + .irq_unmask = intc_enable, + .irq_mask_ack = intc_mask_ack, + .irq_enable = intc_enable, + .irq_disable = intc_disable, + .irq_set_type = intc_set_type, +#ifdef CONFIG_SMP + .irq_set_affinity = intc_set_affinity, +#endif + .flags = IRQCHIP_SKIP_SET_WAKE, +}; |