/* * S3C24XX IRQ handling * * Copyright (c) 2003-2004 Simtec Electronics * Ben Dooks * Copyright (c) 2012 Heiko Stuebner * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define S3C_IRQTYPE_NONE 0 #define S3C_IRQTYPE_EINT 1 #define S3C_IRQTYPE_EDGE 2 #define S3C_IRQTYPE_LEVEL 3 struct s3c_irq_data { unsigned int type; unsigned long parent_irq; /* data gets filled during init */ struct s3c_irq_intc *intc; unsigned long sub_bits; struct s3c_irq_intc *sub_intc; }; /* * Sructure holding the controller data * @reg_pending register holding pending irqs * @reg_intpnd special register intpnd in main intc * @reg_mask mask register * @domain irq_domain of the controller * @parent parent controller for ext and sub irqs * @irqs irq-data, always s3c_irq_data[32] */ struct s3c_irq_intc { void __iomem *reg_pending; void __iomem *reg_intpnd; void __iomem *reg_mask; struct irq_domain *domain; struct s3c_irq_intc *parent; struct s3c_irq_data *irqs; }; static void s3c_irq_mask(struct irq_data *data) { struct s3c_irq_intc *intc = data->domain->host_data; struct s3c_irq_intc *parent_intc = intc->parent; struct s3c_irq_data *irq_data = &intc->irqs[data->hwirq]; struct s3c_irq_data *parent_data; unsigned long mask; unsigned int irqno; mask = __raw_readl(intc->reg_mask); mask |= (1UL << data->hwirq); __raw_writel(mask, intc->reg_mask); if (parent_intc && irq_data->parent_irq) { parent_data = &parent_intc->irqs[irq_data->parent_irq]; /* check to see if we need to mask the parent IRQ */ if ((mask & parent_data->sub_bits) == parent_data->sub_bits) { irqno = irq_find_mapping(parent_intc->domain, irq_data->parent_irq); s3c_irq_mask(irq_get_irq_data(irqno)); } } } static void s3c_irq_unmask(struct irq_data *data) { struct s3c_irq_intc *intc = data->domain->host_data; struct s3c_irq_intc *parent_intc = intc->parent; struct s3c_irq_data *irq_data = &intc->irqs[data->hwirq]; unsigned long mask; unsigned int irqno; mask = __raw_readl(intc->reg_mask); mask &= ~(1UL << data->hwirq); __raw_writel(mask, intc->reg_mask); if (parent_intc && irq_data->parent_irq) { irqno = irq_find_mapping(parent_intc->domain, irq_data->parent_irq); s3c_irq_unmask(irq_get_irq_data(irqno)); } } static inline void s3c_irq_ack(struct irq_data *data) { struct s3c_irq_intc *intc = data->domain->host_data; unsigned long bitval = 1UL << data->hwirq; __raw_writel(bitval, intc->reg_pending); if (intc->reg_intpnd) __raw_writel(bitval, intc->reg_intpnd); } static int s3c_irqext_type_set(void __iomem *gpcon_reg, void __iomem *extint_reg, unsigned long gpcon_offset, unsigned long extint_offset, unsigned int type) { unsigned long newvalue = 0, value; /* Set the GPIO to external interrupt mode */ value = __raw_readl(gpcon_reg); value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset); __raw_writel(value, gpcon_reg); /* Set the external interrupt to pointed trigger type */ switch (type) { case IRQ_TYPE_NONE: pr_warn("No edge setting!\n"); break; case IRQ_TYPE_EDGE_RISING: newvalue = S3C2410_EXTINT_RISEEDGE; break; case IRQ_TYPE_EDGE_FALLING: newvalue = S3C2410_EXTINT_FALLEDGE; break; case IRQ_TYPE_EDGE_BOTH: newvalue = S3C2410_EXTINT_BOTHEDGE; break; case IRQ_TYPE_LEVEL_LOW: newvalue = S3C2410_EXTINT_LOWLEV; break; case IRQ_TYPE_LEVEL_HIGH: newvalue = S3C2410_EXTINT_HILEV; break; default: pr_err("No such irq type %d", type); return -EINVAL; } value = __raw_readl(extint_reg); value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset); __raw_writel(value, extint_reg); return 0; } /* FIXME: make static when it's out of plat-samsung/irq.h */ int s3c_irqext_type(struct irq_data *data, unsigned int type) { void __iomem *extint_reg; void __iomem *gpcon_reg; unsigned long gpcon_offset, extint_offset; if ((data->hwirq >= 4) && (data->hwirq <= 7)) { gpcon_reg = S3C2410_GPFCON; extint_reg = S3C24XX_EXTINT0; gpcon_offset = (data->hwirq) * 2; extint_offset = (data->hwirq) * 4; } else if ((data->hwirq >= 8) && (data->hwirq <= 15)) { gpcon_reg = S3C2410_GPGCON; extint_reg = S3C24XX_EXTINT1; gpcon_offset = (data->hwirq - 8) * 2; extint_offset = (data->hwirq - 8) * 4; } else if ((data->hwirq >= 16) && (data->hwirq <= 23)) { gpcon_reg = S3C2410_GPGCON; extint_reg = S3C24XX_EXTINT2; gpcon_offset = (data->hwirq - 8) * 2; extint_offset = (data->hwirq - 16) * 4; } else { return -EINVAL; } return s3c_irqext_type_set(gpcon_reg, extint_reg, gpcon_offset, extint_offset, type); } static int s3c_irqext0_type(struct irq_data *data, unsigned int type) { void __iomem *extint_reg; void __iomem *gpcon_reg; unsigned long gpcon_offset, extint_offset; if ((data->hwirq >= 0) && (data->hwirq <= 3)) { gpcon_reg = S3C2410_GPFCON; extint_reg = S3C24XX_EXTINT0; gpcon_offset = (data->hwirq) * 2; extint_offset = (data->hwirq) * 4; } else { return -EINVAL; } return s3c_irqext_type_set(gpcon_reg, extint_reg, gpcon_offset, extint_offset, type); } struct irq_chip s3c_irq_chip = { .name = "s3c", .irq_ack = s3c_irq_ack, .irq_mask = s3c_irq_mask, .irq_unmask = s3c_irq_unmask, .irq_set_wake = s3c_irq_wake }; struct irq_chip s3c_irq_level_chip = { .name = "s3c-level", .irq_mask = s3c_irq_mask, .irq_unmask = s3c_irq_unmask, .irq_ack = s3c_irq_ack, }; static struct irq_chip s3c_irqext_chip = { .name = "s3c-ext", .irq_mask = s3c_irq_mask, .irq_unmask = s3c_irq_unmask, .irq_ack = s3c_irq_ack, .irq_set_type = s3c_irqext_type, .irq_set_wake = s3c_irqext_wake }; static struct irq_chip s3c_irq_eint0t4 = { .name = "s3c-ext0", .irq_ack = s3c_irq_ack, .irq_mask = s3c_irq_mask, .irq_unmask = s3c_irq_unmask, .irq_set_wake = s3c_irq_wake, .irq_set_type = s3c_irqext0_type, }; static void s3c_irq_demux(unsigned int irq, struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); struct s3c_irq_intc *intc = desc->irq_data.domain->host_data; struct s3c_irq_data *irq_data = &intc->irqs[desc->irq_data.hwirq]; struct s3c_irq_intc *sub_intc = irq_data->sub_intc; unsigned long src; unsigned long msk; unsigned int n; chained_irq_enter(chip, desc); src = __raw_readl(sub_intc->reg_pending); msk = __raw_readl(sub_intc->reg_mask); src &= ~msk; src &= irq_data->sub_bits; while (src) { n = __ffs(src); src &= ~(1 << n); generic_handle_irq(irq_find_mapping(sub_intc->domain, n)); } chained_irq_exit(chip, desc); } #ifdef CONFIG_FIQ /** * s3c24xx_set_fiq - set the FIQ routing * @irq: IRQ number to route to FIQ on processor. * @on: Whether to route @irq to the FIQ, or to remove the FIQ routing. * * Change the state of the IRQ to FIQ routing depending on @irq and @on. If * @on is true, the @irq is checked to see if it can be routed and the * interrupt controller updated to route the IRQ. If @on is false, the FIQ * routing is cleared, regardless of which @irq is specified. */ int s3c24xx_set_fiq(unsigned int irq, bool on) { u32 intmod; unsigned offs; if (on) { offs = irq - FIQ_START; if (offs > 31) return -EINVAL; intmod = 1 << offs; } else { intmod = 0; } __raw_writel(intmod, S3C2410_INTMOD); return 0; } EXPORT_SYMBOL_GPL(s3c24xx_set_fiq); #endif static int s3c24xx_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { struct s3c_irq_intc *intc = h->host_data; struct s3c_irq_data *irq_data = &intc->irqs[hw]; struct s3c_irq_intc *parent_intc; struct s3c_irq_data *parent_irq_data; unsigned int irqno; if (!intc) { pr_err("irq-s3c24xx: no controller found for hwirq %lu\n", hw); return -EINVAL; } if (!irq_data) { pr_err("irq-s3c24xx: no irq data found for hwirq %lu\n", hw); return -EINVAL; } /* attach controller pointer to irq_data */ irq_data->intc = intc; /* set handler and flags */ switch (irq_data->type) { case S3C_IRQTYPE_NONE: return 0; case S3C_IRQTYPE_EINT: if (irq_data->parent_irq) irq_set_chip_and_handler(virq, &s3c_irqext_chip, handle_edge_irq); else irq_set_chip_and_handler(virq, &s3c_irq_eint0t4, handle_edge_irq); break; case S3C_IRQTYPE_EDGE: if (irq_data->parent_irq) irq_set_chip_and_handler(virq, &s3c_irq_level_chip, handle_edge_irq); else irq_set_chip_and_handler(virq, &s3c_irq_chip, handle_edge_irq); break; case S3C_IRQTYPE_LEVEL: if (irq_data->parent_irq) irq_set_chip_and_handler(virq, &s3c_irq_level_chip, handle_level_irq); else irq_set_chip_and_handler(virq, &s3c_irq_chip, handle_level_irq); break; default: pr_err("irq-s3c24xx: unsupported irqtype %d\n", irq_data->type); return -EINVAL; } set_irq_flags(virq, IRQF_VALID); if (irq_data->parent_irq) { parent_intc = intc->parent; if (!parent_intc) { pr_err("irq-s3c24xx: no parent controller found for hwirq %lu\n", hw); goto err; } parent_irq_data = &parent_intc->irqs[irq_data->parent_irq]; if (!irq_data) { pr_err("irq-s3c24xx: no irq data found for hwirq %lu\n", hw); goto err; } parent_irq_data->sub_intc = intc; parent_irq_data->sub_bits |= (1UL << hw); /* attach the demuxer to the parent irq */ irqno = irq_find_mapping(parent_intc->domain, irq_data->parent_irq); if (!irqno) { pr_err("irq-s3c24xx: could not find mapping for parent irq %lu\n", irq_data->parent_irq); goto err; } irq_set_chained_handler(irqno, s3c_irq_demux); } return 0; err: set_irq_flags(virq, 0); /* the only error can result from bad mapping data*/ return -EINVAL; } static struct irq_domain_ops s3c24xx_irq_ops = { .map = s3c24xx_irq_map, .xlate = irq_domain_xlate_twocell, }; static void s3c24xx_clear_intc(struct s3c_irq_intc *intc) { void __iomem *reg_source; unsigned long pend; unsigned long last; int i; /* if intpnd is set, read the next pending irq from there */ reg_source = intc->reg_intpnd ? intc->reg_intpnd : intc->reg_pending; last = 0; for (i = 0; i < 4; i++) { pend = __raw_readl(reg_source); if (pend == 0 || pend == last) break; __raw_writel(pend, intc->reg_pending); if (intc->reg_intpnd) __raw_writel(pend, intc->reg_intpnd); pr_info("irq: clearing pending status %08x\n", (int)pend); last = pend; } } struct s3c_irq_intc *s3c24xx_init_intc(struct device_node *np, struct s3c_irq_data *irq_data, struct s3c_irq_intc *parent, unsigned long address) { struct s3c_irq_intc *intc; void __iomem *base = (void *)0xf6000000; /* static mapping */ int irq_num; int irq_start; int irq_offset; int ret; intc = kzalloc(sizeof(struct s3c_irq_intc), GFP_KERNEL); if (!intc) return ERR_PTR(-ENOMEM); intc->irqs = irq_data; if (parent) intc->parent = parent; /* select the correct data for the controller. * Need to hard code the irq num start and offset * to preserve the static mapping for now */ switch (address) { case 0x4a000000: pr_debug("irq: found main intc\n"); intc->reg_pending = base; intc->reg_mask = base + 0x08; intc->reg_intpnd = base + 0x10; irq_num = 32; irq_start = S3C2410_IRQ(0); irq_offset = 0; break; case 0x4a000018: pr_debug("irq: found subintc\n"); intc->reg_pending = base + 0x18; intc->reg_mask = base + 0x1c; irq_num = 29; irq_start = S3C2410_IRQSUB(0); irq_offset = 0; break; case 0x4a000040: pr_debug("irq: found intc2\n"); intc->reg_pending = base + 0x40; intc->reg_mask = base + 0x48; intc->reg_intpnd = base + 0x50; irq_num = 8; irq_start = S3C2416_IRQ(0); irq_offset = 0; break; case 0x560000a4: pr_debug("irq: found eintc\n"); base = (void *)0xfd000000; intc->reg_mask = base + 0xa4; intc->reg_pending = base + 0x08; irq_num = 20; irq_start = S3C2410_IRQ(32); irq_offset = 4; break; default: pr_err("irq: unsupported controller address\n"); ret = -EINVAL; goto err; } /* now that all the data is complete, init the irq-domain */ s3c24xx_clear_intc(intc); intc->domain = irq_domain_add_legacy(np, irq_num, irq_start, irq_offset, &s3c24xx_irq_ops, intc); if (!intc->domain) { pr_err("irq: could not create irq-domain\n"); ret = -EINVAL; goto err; } return intc; err: kfree(intc); return ERR_PTR(ret); } /* s3c24xx_init_irq * * Initialise S3C2410 IRQ system */ static struct s3c_irq_data init_base[32] = { { .type = S3C_IRQTYPE_EINT, }, /* EINT0 */ { .type = S3C_IRQTYPE_EINT, }, /* EINT1 */ { .type = S3C_IRQTYPE_EINT, }, /* EINT2 */ { .type = S3C_IRQTYPE_EINT, }, /* EINT3 */ { .type = S3C_IRQTYPE_LEVEL, }, /* EINT4to7 */ { .type = S3C_IRQTYPE_LEVEL, }, /* EINT8to23 */ { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_EDGE, }, /* nBATT_FLT */ { .type = S3C_IRQTYPE_EDGE, }, /* TICK */ { .type = S3C_IRQTYPE_EDGE, }, /* WDT */ { .type = S3C_IRQTYPE_EDGE, }, /* TIMER0 */ { .type = S3C_IRQTYPE_EDGE, }, /* TIMER1 */ { .type = S3C_IRQTYPE_EDGE, }, /* TIMER2 */ { .type = S3C_IRQTYPE_EDGE, }, /* TIMER3 */ { .type = S3C_IRQTYPE_EDGE, }, /* TIMER4 */ { .type = S3C_IRQTYPE_LEVEL, }, /* UART2 */ { .type = S3C_IRQTYPE_EDGE, }, /* LCD */ { .type = S3C_IRQTYPE_EDGE, }, /* DMA0 */ { .type = S3C_IRQTYPE_EDGE, }, /* DMA1 */ { .type = S3C_IRQTYPE_EDGE, }, /* DMA2 */ { .type = S3C_IRQTYPE_EDGE, }, /* DMA3 */ { .type = S3C_IRQTYPE_EDGE, }, /* SDI */ { .type = S3C_IRQTYPE_EDGE, }, /* SPI0 */ { .type = S3C_IRQTYPE_LEVEL, }, /* UART1 */ { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_EDGE, }, /* USBD */ { .type = S3C_IRQTYPE_EDGE, }, /* USBH */ { .type = S3C_IRQTYPE_EDGE, }, /* IIC */ { .type = S3C_IRQTYPE_LEVEL, }, /* UART0 */ { .type = S3C_IRQTYPE_EDGE, }, /* SPI1 */ { .type = S3C_IRQTYPE_EDGE, }, /* RTC */ { .type = S3C_IRQTYPE_LEVEL, }, /* ADCPARENT */ }; static struct s3c_irq_data init_eint[32] = { { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_NONE, }, /* reserved */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 4 }, /* EINT4 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 4 }, /* EINT5 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 4 }, /* EINT6 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 4 }, /* EINT7 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT8 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT9 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT10 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT11 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT12 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT13 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT14 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT15 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT16 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT17 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT18 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT19 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT20 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT21 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT22 */ { .type = S3C_IRQTYPE_EINT, .parent_irq = 5 }, /* EINT23 */ }; static struct s3c_irq_data init_subint[32] = { { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 28 }, /* UART0-RX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 28 }, /* UART0-TX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 28 }, /* UART0-ERR */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 23 }, /* UART1-RX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 23 }, /* UART1-TX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 23 }, /* UART1-ERR */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 15 }, /* UART2-RX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 15 }, /* UART2-TX */ { .type = S3C_IRQTYPE_LEVEL, .parent_irq = 15 }, /* UART2-ERR */ { .type = S3C_IRQTYPE_EDGE, .parent_irq = 31 }, /* TC */ { .type = S3C_IRQTYPE_EDGE, .parent_irq = 31 }, /* ADC */ }; void __init s3c24xx_init_irq(void) { struct s3c_irq_intc *main_intc; #ifdef CONFIG_FIQ init_FIQ(FIQ_START); #endif main_intc = s3c24xx_init_intc(NULL, &init_base[0], NULL, 0x4a000000); if (IS_ERR(main_intc)) { pr_err("irq: could not create main interrupt controller\n"); return; } s3c24xx_init_intc(NULL, &init_subint[0], main_intc, 0x4a000018); s3c24xx_init_intc(NULL, &init_eint[0], main_intc, 0x560000a4); }