diff options
Diffstat (limited to 'drivers/irqchip/irq-thead-c900-aclint-sswi.c')
| -rw-r--r-- | drivers/irqchip/irq-thead-c900-aclint-sswi.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/drivers/irqchip/irq-thead-c900-aclint-sswi.c b/drivers/irqchip/irq-thead-c900-aclint-sswi.c deleted file mode 100644 index 8ff6e7a1363b..000000000000 --- a/drivers/irqchip/irq-thead-c900-aclint-sswi.c +++ /dev/null @@ -1,176 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2024 Inochi Amaoto <inochiama@gmail.com> - */ - -#define pr_fmt(fmt) "thead-c900-aclint-sswi: " fmt -#include <linux/cpu.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/irq.h> -#include <linux/irqchip.h> -#include <linux/irqchip/chained_irq.h> -#include <linux/module.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> -#include <linux/pci.h> -#include <linux/spinlock.h> -#include <linux/smp.h> -#include <linux/string_choices.h> -#include <asm/sbi.h> -#include <asm/vendorid_list.h> - -#define THEAD_ACLINT_xSWI_REGISTER_SIZE 4 - -#define THEAD_C9XX_CSR_SXSTATUS 0x5c0 -#define THEAD_C9XX_SXSTATUS_CLINTEE BIT(17) - -static int sswi_ipi_virq __ro_after_init; -static DEFINE_PER_CPU(void __iomem *, sswi_cpu_regs); - -static void thead_aclint_sswi_ipi_send(unsigned int cpu) -{ - writel(0x1, per_cpu(sswi_cpu_regs, cpu)); -} - -static void thead_aclint_sswi_ipi_clear(void) -{ - writel_relaxed(0x0, this_cpu_read(sswi_cpu_regs)); -} - -static void thead_aclint_sswi_ipi_handle(struct irq_desc *desc) -{ - struct irq_chip *chip = irq_desc_get_chip(desc); - - chained_irq_enter(chip, desc); - - csr_clear(CSR_IP, IE_SIE); - thead_aclint_sswi_ipi_clear(); - - ipi_mux_process(); - - chained_irq_exit(chip, desc); -} - -static int thead_aclint_sswi_starting_cpu(unsigned int cpu) -{ - enable_percpu_irq(sswi_ipi_virq, irq_get_trigger_type(sswi_ipi_virq)); - - return 0; -} - -static int thead_aclint_sswi_dying_cpu(unsigned int cpu) -{ - thead_aclint_sswi_ipi_clear(); - - disable_percpu_irq(sswi_ipi_virq); - - return 0; -} - -static int __init thead_aclint_sswi_parse_irq(struct fwnode_handle *fwnode, - void __iomem *reg) -{ - struct of_phandle_args parent; - unsigned long hartid; - u32 contexts, i; - int rc, cpu; - - contexts = of_irq_count(to_of_node(fwnode)); - if (!(contexts)) { - pr_err("%pfwP: no ACLINT SSWI context available\n", fwnode); - return -EINVAL; - } - - for (i = 0; i < contexts; i++) { - rc = of_irq_parse_one(to_of_node(fwnode), i, &parent); - if (rc) - return rc; - - rc = riscv_of_parent_hartid(parent.np, &hartid); - if (rc) - return rc; - - if (parent.args[0] != RV_IRQ_SOFT) - return -ENOTSUPP; - - cpu = riscv_hartid_to_cpuid(hartid); - - per_cpu(sswi_cpu_regs, cpu) = reg + i * THEAD_ACLINT_xSWI_REGISTER_SIZE; - } - - pr_info("%pfwP: register %u CPU%s\n", fwnode, contexts, str_plural(contexts)); - - return 0; -} - -static int __init thead_aclint_sswi_probe(struct fwnode_handle *fwnode) -{ - struct irq_domain *domain; - void __iomem *reg; - int virq, rc; - - /* If it is T-HEAD CPU, check whether SSWI is enabled */ - if (riscv_cached_mvendorid(0) == THEAD_VENDOR_ID && - !(csr_read(THEAD_C9XX_CSR_SXSTATUS) & THEAD_C9XX_SXSTATUS_CLINTEE)) - return -ENOTSUPP; - - if (!is_of_node(fwnode)) - return -EINVAL; - - reg = of_iomap(to_of_node(fwnode), 0); - if (!reg) - return -ENOMEM; - - /* Parse SSWI setting */ - rc = thead_aclint_sswi_parse_irq(fwnode, reg); - if (rc < 0) - return rc; - - /* If mulitple SSWI devices are present, do not register irq again */ - if (sswi_ipi_virq) - return 0; - - /* Find riscv intc domain and create IPI irq mapping */ - domain = irq_find_matching_fwnode(riscv_get_intc_hwnode(), DOMAIN_BUS_ANY); - if (!domain) { - pr_err("%pfwP: Failed to find INTC domain\n", fwnode); - return -ENOENT; - } - - sswi_ipi_virq = irq_create_mapping(domain, RV_IRQ_SOFT); - if (!sswi_ipi_virq) { - pr_err("unable to create ACLINT SSWI IRQ mapping\n"); - return -ENOMEM; - } - - /* Register SSWI irq and handler */ - virq = ipi_mux_create(BITS_PER_BYTE, thead_aclint_sswi_ipi_send); - if (virq <= 0) { - pr_err("unable to create muxed IPIs\n"); - irq_dispose_mapping(sswi_ipi_virq); - return virq < 0 ? virq : -ENOMEM; - } - - irq_set_chained_handler(sswi_ipi_virq, thead_aclint_sswi_ipi_handle); - - cpuhp_setup_state(CPUHP_AP_IRQ_THEAD_ACLINT_SSWI_STARTING, - "irqchip/thead-aclint-sswi:starting", - thead_aclint_sswi_starting_cpu, - thead_aclint_sswi_dying_cpu); - - riscv_ipi_set_virq_range(virq, BITS_PER_BYTE); - - /* Announce that SSWI is providing IPIs */ - pr_info("providing IPIs using THEAD ACLINT SSWI\n"); - - return 0; -} - -static int __init thead_aclint_sswi_early_probe(struct device_node *node, - struct device_node *parent) -{ - return thead_aclint_sswi_probe(&node->fwnode); -} -IRQCHIP_DECLARE(thead_aclint_sswi, "thead,c900-aclint-sswi", thead_aclint_sswi_early_probe); |