// SPDX-License-Identifier: GPL-2.0 /* * H8S interrupt contoller driver * * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp> */ #include <linux/irq.h> #include <linux/irqchip.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <asm/io.h> static void *intc_baseaddr; #define IPRA ((unsigned long)intc_baseaddr) static const unsigned char ipr_table[] = { 0x03, 0x02, 0x01, 0x00, 0x13, 0x12, 0x11, 0x10, /* 16 - 23 */ 0x23, 0x22, 0x21, 0x20, 0x33, 0x32, 0x31, 0x30, /* 24 - 31 */ 0x43, 0x42, 0x41, 0x40, 0x53, 0x53, 0x52, 0x52, /* 32 - 39 */ 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, /* 40 - 47 */ 0x50, 0x50, 0x50, 0x50, 0x63, 0x63, 0x63, 0x63, /* 48 - 55 */ 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, /* 56 - 63 */ 0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60, /* 64 - 71 */ 0x73, 0x73, 0x73, 0x73, 0x72, 0x72, 0x72, 0x72, /* 72 - 79 */ 0x71, 0x71, 0x71, 0x71, 0x70, 0x83, 0x82, 0x81, /* 80 - 87 */ 0x80, 0x80, 0x80, 0x80, 0x93, 0x93, 0x93, 0x93, /* 88 - 95 */ 0x92, 0x92, 0x92, 0x92, 0x91, 0x91, 0x91, 0x91, /* 96 - 103 */ 0x90, 0x90, 0x90, 0x90, 0xa3, 0xa3, 0xa3, 0xa3, /* 104 - 111 */ 0xa2, 0xa2, 0xa2, 0xa2, 0xa1, 0xa1, 0xa1, 0xa1, /* 112 - 119 */ 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, /* 120 - 127 */ }; static void h8s_disable_irq(struct irq_data *data) { int pos; unsigned int addr; unsigned short pri; int irq = data->irq; addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); pos = (ipr_table[irq - 16] & 0x0f) * 4; pri = ~(0x000f << pos); pri &= readw(addr); writew(pri, addr); } static void h8s_enable_irq(struct irq_data *data) { int pos; unsigned int addr; unsigned short pri; int irq = data->irq; addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3); pos = (ipr_table[irq - 16] & 0x0f) * 4; pri = ~(0x000f << pos); pri &= readw(addr); pri |= 1 << pos; writew(pri, addr); } struct irq_chip h8s_irq_chip = { .name = "H8S-INTC", .irq_enable = h8s_enable_irq, .irq_disable = h8s_disable_irq, }; static __init int irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw_irq_num) { irq_set_chip_and_handler(virq, &h8s_irq_chip, handle_simple_irq); return 0; } static const struct irq_domain_ops irq_ops = { .map = irq_map, .xlate = irq_domain_xlate_onecell, }; static int __init h8s_intc_of_init(struct device_node *intc, struct device_node *parent) { struct irq_domain *domain; int n; intc_baseaddr = of_iomap(intc, 0); BUG_ON(!intc_baseaddr); /* All interrupt priority is 0 (disable) */ /* IPRA to IPRK */ for (n = 0; n <= 'k' - 'a'; n++) writew(0x0000, IPRA + (n * 2)); domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL); BUG_ON(!domain); irq_set_default_host(domain); return 0; } IRQCHIP_DECLARE(h8s_intc, "renesas,h8s-intc", h8s_intc_of_init);