From: Greentime Hu <greentime@xxxxxxxxxxxxx> Signed-off-by: Rick Chen <rick@xxxxxxxxxxxxx> Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx> --- drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-ativic32.c | 149 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 150 insertions(+) create mode 100644 drivers/irqchip/irq-ativic32.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index b842dfd..201ca9f 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -80,3 +80,4 @@ obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o irq-aspeed-i2c-ic.o obj-$(CONFIG_STM32_EXTI) += irq-stm32-exti.o obj-$(CONFIG_QCOM_IRQ_COMBINER) += qcom-irq-combiner.o obj-$(CONFIG_IRQ_UNIPHIER_AIDET) += irq-uniphier-aidet.o +obj-$(CONFIG_NDS32) += irq-ativic32.o diff --git a/drivers/irqchip/irq-ativic32.c b/drivers/irqchip/irq-ativic32.c new file mode 100644 index 0000000..d3dae59 --- /dev/null +++ b/drivers/irqchip/irq-ativic32.c @@ -0,0 +1,149 @@ +/* + * Copyright (C) 2005-2017 Andes Technology Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/irq.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/interrupt.h> +#include <linux/irqdomain.h> +#include <linux/irqchip.h> +#include <nds32_intrinsic.h> + +static void ativic32_ack_irq(struct irq_data *data) +{ + __nds32__mtsr_dsb(1 << data->hwirq, NDS32_SR_INT_PEND2); +} + +static void ativic32_mask_irq(struct irq_data *data) +{ + unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2); + __nds32__mtsr_dsb(int_mask2 & (~(1 << data->hwirq)), NDS32_SR_INT_MASK2); +} + +static void ativic32_mask_ack_irq(struct irq_data *data) +{ + unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2); + __nds32__mtsr_dsb(int_mask2 & (~(1 << data->hwirq)), NDS32_SR_INT_MASK2); + __nds32__mtsr_dsb((1 << data->hwirq), NDS32_SR_INT_PEND2); + +} + +static void ativic32_unmask_irq(struct irq_data *data) +{ + unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2); + __nds32__mtsr_dsb(int_mask2 | (1 << data->hwirq), NDS32_SR_INT_MASK2); +} + +static int ativic32_set_type(struct irq_data *data, unsigned int flow_type) +{ + printk(KERN_WARNING "interrupt type is not configurable\n"); + return 0; +} + +static struct irq_chip ativic32_chip = { + .name = "ativic32", + .irq_ack = ativic32_ack_irq, + .irq_mask = ativic32_mask_irq, + .irq_mask_ack = ativic32_mask_ack_irq, + .irq_unmask = ativic32_unmask_irq, + .irq_set_type = ativic32_set_type, +}; + +static unsigned int __initdata nivic_map[6] = { 6, 2, 10, 16, 24, 32 }; + +struct irq_domain *root_domain; +static int ativic32_irq_domain_map(struct irq_domain *id, unsigned int virq, + irq_hw_number_t hw) +{ + + unsigned long int_trigger_type; + int_trigger_type = __nds32__mfsr(NDS32_SR_INT_TRIGGER); + if (int_trigger_type & (1 << hw)) + irq_set_chip_and_handler(virq, &ativic32_chip, handle_edge_irq); + else + irq_set_chip_and_handler(virq, &ativic32_chip, handle_level_irq); + + return 0; +} + +static struct irq_domain_ops ativic32_ops = { + .map = ativic32_irq_domain_map, + .xlate = irq_domain_xlate_onecell +}; + +static int get_intr_src(void) +{ + return ((__nds32__mfsr(NDS32_SR_ITYPE)&ITYPE_mskVECTOR) >> ITYPE_offVECTOR) + - NDS32_VECTOR_offINTERRUPT; +} + +asmlinkage void asm_do_IRQ(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + int virq; + int irq = get_intr_src(); + + /* + * Some hardware gives randomly wrong interrupts. Rather + * than crashing, do something sensible. + */ + if (unlikely(irq >= NR_IRQS)) { + pr_emerg( "IRQ exceeds NR_IRQS\n"); + BUG(); + } + + irq_enter(); + virq = irq_find_mapping(root_domain, irq); + generic_handle_irq(virq); + irq_exit(); + set_irq_regs(old_regs); + +} + +int __init ativic32_init_irq(struct device_node *node, struct device_node *parent) +{ + unsigned long int_vec_base, nivic, i; + + if (WARN(parent, "non-root ativic32 are not supported")) + return -EINVAL; + + int_vec_base = __nds32__mfsr(NDS32_SR_IVB); + + if (((int_vec_base & IVB_mskIVIC_VER) >> IVB_offIVIC_VER) == 0) { + panic("Unable to use NOINTC option to boot on this cpu\n"); + } + + nivic = (int_vec_base & IVB_mskNIVIC) >> IVB_offNIVIC; + if (nivic >= (sizeof nivic_map / sizeof nivic_map[0])) { + panic + ("The number of input for IVIC Controller is not supported on this cpu\n"); + } + nivic = nivic_map[nivic]; + + root_domain = irq_domain_add_linear(node, nivic, + &ativic32_ops, NULL); + + if (!root_domain) + panic("%s: unable to create IRQ domain\n", node->full_name); + + for(i = 0; i < nivic; i++) + irq_create_mapping(root_domain, i); + + return 0; + +} +IRQCHIP_DECLARE(ativic32, "andestech,ativic32", ativic32_init_irq); -- 1.7.9.5
