^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Loongson HTPIC IRQ support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/of_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/irqchip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/irqchip/chained_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/syscore_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/i8259.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define HTPIC_MAX_PARENT_IRQ 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define HTINT_NUM_VECTORS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define HTINT_EN_OFF 0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct loongson_htpic {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct irq_domain *domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static struct loongson_htpic *htpic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static void htpic_irq_dispatch(struct irq_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct loongson_htpic *priv = irq_desc_get_handler_data(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct irq_chip *chip = irq_desc_get_chip(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) uint32_t pending;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) chained_irq_enter(chip, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) pending = readl(priv->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Ack all IRQs at once, otherwise IRQ flood might happen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) writel(pending, priv->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!pending)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) spurious_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) while (pending) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int bit = __ffs(pending);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (unlikely(bit > 15)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) spurious_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) generic_handle_irq(irq_linear_revmap(priv->domain, bit));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) pending &= ~BIT(bit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) chained_irq_exit(chip, desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static void htpic_reg_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) for (i = 0; i < HTINT_NUM_VECTORS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) uint32_t val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* Disable all HT Vectors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) writel(0x0, htpic->base + HTINT_EN_OFF + i * 0x4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) val = readl(htpic->base + i * 0x4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* Ack all possible pending IRQs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) writel(GENMASK(31, 0), htpic->base + i * 0x4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* Enable 16 vectors for PIC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) writel(0xffff, htpic->base + HTINT_EN_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static void htpic_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) htpic_reg_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) struct syscore_ops htpic_syscore_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .resume = htpic_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int __init htpic_of_init(struct device_node *node, struct device_node *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned int parent_irq[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int i, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) int num_parents = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (htpic) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) pr_err("loongson-htpic: Only one HTPIC is allowed in the system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) htpic = kzalloc(sizeof(*htpic), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!htpic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) htpic->base = of_iomap(node, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (!htpic->base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) htpic->domain = __init_i8259_irqs(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (!htpic->domain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) pr_err("loongson-htpic: Failed to initialize i8259 IRQs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) goto out_iounmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* Interrupt may come from any of the 4 interrupt line */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) for (i = 0; i < HTPIC_MAX_PARENT_IRQ; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) parent_irq[i] = irq_of_parse_and_map(node, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (parent_irq[i] <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) num_parents++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (!num_parents) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) pr_err("loongson-htpic: Failed to get parent irqs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) goto out_remove_domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) htpic_reg_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) for (i = 0; i < num_parents; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) irq_set_chained_handler_and_data(parent_irq[i],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) htpic_irq_dispatch, htpic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) register_syscore_ops(&htpic_syscore_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) out_remove_domain:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) irq_domain_remove(htpic->domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) out_iounmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) iounmap(htpic->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) kfree(htpic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) IRQCHIP_DECLARE(loongson_htpic, "loongson,htpic-1.0", htpic_of_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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