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irqchip: Add Loongson HyperTransport Vector support
This controller appears on Loongson-3 chips for receiving interrupt vectors from PCH's PIC and PCH's PCIe MSI interrupts. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200528152757.1028711-2-jiaxun.yang@flygoat.com
This commit is contained in:
Jiaxun Yang
Marc Zyngier
parent
0e375f5101
commit
818e915fba
@ -532,4 +532,12 @@ config LOONGSON_HTPIC
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help
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Support for the Loongson-3 HyperTransport PIC Controller.
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config LOONGSON_HTVEC
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bool "Loongson3 HyperTransport Interrupt Vector Controller"
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depends on MACH_LOONGSON64 || COMPILE_TEST
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default MACH_LOONGSON64
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select IRQ_DOMAIN_HIERARCHY
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help
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Support for the Loongson3 HyperTransport Interrupt Vector Controller.
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endmenu
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@ -107,3 +107,4 @@ obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o
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obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o
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obj-$(CONFIG_LOONGSON_LIOINTC) += irq-loongson-liointc.o
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obj-$(CONFIG_LOONGSON_HTPIC) += irq-loongson-htpic.o
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obj-$(CONFIG_LOONGSON_HTVEC) += irq-loongson-htvec.o
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214
drivers/irqchip/irq-loongson-htvec.c
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214
drivers/irqchip/irq-loongson-htvec.c
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@ -0,0 +1,214 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
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* Loongson HyperTransport Interrupt Vector support
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*/
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#define pr_fmt(fmt) "htvec: " fmt
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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/* Registers */
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#define HTVEC_EN_OFF 0x20
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#define HTVEC_MAX_PARENT_IRQ 4
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#define VEC_COUNT_PER_REG 32
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#define VEC_REG_COUNT 4
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#define VEC_COUNT (VEC_COUNT_PER_REG * VEC_REG_COUNT)
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#define VEC_REG_IDX(irq_id) ((irq_id) / VEC_COUNT_PER_REG)
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#define VEC_REG_BIT(irq_id) ((irq_id) % VEC_COUNT_PER_REG)
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struct htvec {
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void __iomem *base;
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struct irq_domain *htvec_domain;
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raw_spinlock_t htvec_lock;
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};
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static void htvec_irq_dispatch(struct irq_desc *desc)
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{
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int i;
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u32 pending;
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bool handled = false;
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct htvec *priv = irq_desc_get_handler_data(desc);
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chained_irq_enter(chip, desc);
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for (i = 0; i < VEC_REG_COUNT; i++) {
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pending = readl(priv->base + 4 * i);
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while (pending) {
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int bit = __ffs(pending);
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generic_handle_irq(irq_linear_revmap(priv->htvec_domain, bit +
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VEC_COUNT_PER_REG * i));
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pending &= ~BIT(bit);
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handled = true;
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}
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}
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if (!handled)
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spurious_interrupt();
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chained_irq_exit(chip, desc);
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}
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static void htvec_ack_irq(struct irq_data *d)
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{
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struct htvec *priv = irq_data_get_irq_chip_data(d);
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writel(BIT(VEC_REG_BIT(d->hwirq)),
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priv->base + VEC_REG_IDX(d->hwirq) * 4);
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}
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static void htvec_mask_irq(struct irq_data *d)
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{
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u32 reg;
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void __iomem *addr;
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struct htvec *priv = irq_data_get_irq_chip_data(d);
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raw_spin_lock(&priv->htvec_lock);
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addr = priv->base + HTVEC_EN_OFF;
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addr += VEC_REG_IDX(d->hwirq) * 4;
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reg = readl(addr);
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reg &= ~BIT(VEC_REG_BIT(d->hwirq));
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writel(reg, addr);
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raw_spin_unlock(&priv->htvec_lock);
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}
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static void htvec_unmask_irq(struct irq_data *d)
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{
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u32 reg;
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void __iomem *addr;
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struct htvec *priv = irq_data_get_irq_chip_data(d);
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raw_spin_lock(&priv->htvec_lock);
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addr = priv->base + HTVEC_EN_OFF;
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addr += VEC_REG_IDX(d->hwirq) * 4;
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reg = readl(addr);
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reg |= BIT(VEC_REG_BIT(d->hwirq));
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writel(reg, addr);
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raw_spin_unlock(&priv->htvec_lock);
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}
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static struct irq_chip htvec_irq_chip = {
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.name = "LOONGSON_HTVEC",
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.irq_mask = htvec_mask_irq,
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.irq_unmask = htvec_unmask_irq,
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.irq_ack = htvec_ack_irq,
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};
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static int htvec_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *arg)
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{
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unsigned long hwirq;
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unsigned int type, i;
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struct htvec *priv = domain->host_data;
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irq_domain_translate_onecell(domain, arg, &hwirq, &type);
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for (i = 0; i < nr_irqs; i++) {
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irq_domain_set_info(domain, virq + i, hwirq + i, &htvec_irq_chip,
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priv, handle_edge_irq, NULL, NULL);
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}
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return 0;
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}
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static void htvec_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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int i;
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for (i = 0; i < nr_irqs; i++) {
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struct irq_data *d = irq_domain_get_irq_data(domain, virq + i);
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irq_set_handler(virq + i, NULL);
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irq_domain_reset_irq_data(d);
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}
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}
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static const struct irq_domain_ops htvec_domain_ops = {
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.translate = irq_domain_translate_onecell,
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.alloc = htvec_domain_alloc,
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.free = htvec_domain_free,
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};
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static void htvec_reset(struct htvec *priv)
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{
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u32 idx;
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/* Clear IRQ cause registers, mask all interrupts */
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for (idx = 0; idx < VEC_REG_COUNT; idx++) {
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writel_relaxed(0x0, priv->base + HTVEC_EN_OFF + 4 * idx);
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writel_relaxed(0xFFFFFFFF, priv->base);
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}
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}
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static int htvec_of_init(struct device_node *node,
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struct device_node *parent)
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{
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struct htvec *priv;
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int err, parent_irq[4], num_parents = 0, i;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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raw_spin_lock_init(&priv->htvec_lock);
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priv->base = of_iomap(node, 0);
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if (!priv->base) {
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err = -ENOMEM;
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goto free_priv;
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}
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/* Interrupt may come from any of the 4 interrupt line */
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for (i = 0; i < HTVEC_MAX_PARENT_IRQ; i++) {
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parent_irq[i] = irq_of_parse_and_map(node, i);
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if (parent_irq[i] <= 0)
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break;
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num_parents++;
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}
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if (!num_parents) {
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pr_err("Failed to get parent irqs\n");
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err = -ENODEV;
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goto iounmap_base;
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}
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priv->htvec_domain = irq_domain_create_linear(of_node_to_fwnode(node),
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VEC_COUNT,
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&htvec_domain_ops,
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priv);
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if (!priv->htvec_domain) {
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pr_err("Failed to create IRQ domain\n");
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err = -ENOMEM;
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goto iounmap_base;
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}
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htvec_reset(priv);
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for (i = 0; i < num_parents; i++)
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irq_set_chained_handler_and_data(parent_irq[i],
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htvec_irq_dispatch, priv);
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return 0;
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iounmap_base:
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iounmap(priv->base);
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free_priv:
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kfree(priv);
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return err;
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}
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IRQCHIP_DECLARE(htvec, "loongson,htvec-1.0", htvec_of_init);
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