diff options
Diffstat (limited to 'target/linux/realtek/patches-5.10/006-5.12-irqchip-add-support-for-realtek-rtl838x-rtl839x-interrupt-controller.patch')
| -rw-r--r-- | target/linux/realtek/patches-5.10/006-5.12-irqchip-add-support-for-realtek-rtl838x-rtl839x-interrupt-controller.patch | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/target/linux/realtek/patches-5.10/006-5.12-irqchip-add-support-for-realtek-rtl838x-rtl839x-interrupt-controller.patch b/target/linux/realtek/patches-5.10/006-5.12-irqchip-add-support-for-realtek-rtl838x-rtl839x-interrupt-controller.patch new file mode 100644 index 0000000000..753c41eb2f --- /dev/null +++ b/target/linux/realtek/patches-5.10/006-5.12-irqchip-add-support-for-realtek-rtl838x-rtl839x-interrupt-controller.patch @@ -0,0 +1,211 @@ +From 9f3a0f34b84ad1b9a8f2bdae44b66f16685b2143 Mon Sep 17 00:00:00 2001 +From: Bert Vermeulen <bert@biot.com> +Date: Fri, 22 Jan 2021 21:42:24 +0100 +Subject: irqchip: Add support for Realtek RTL838x/RTL839x interrupt controller + +This is a standard IRQ driver with only status and mask registers. + +The mapping from SoC interrupts (18-31) to MIPS core interrupts is +done via an interrupt-map in device tree. + +Signed-off-by: Bert Vermeulen <bert@biot.com> +Signed-off-by: Birger Koblitz <mail@birger-koblitz.de> +Acked-by: John Crispin <john@phrozen.org> +Signed-off-by: Marc Zyngier <maz@kernel.org> +Link: https://lore.kernel.org/r/20210122204224.509124-3-bert@biot.com +--- + drivers/irqchip/Makefile | 1 + + drivers/irqchip/irq-realtek-rtl.c | 180 ++++++++++++++++++++++++++++++++++++++ + 2 files changed, 181 insertions(+) + create mode 100644 drivers/irqchip/irq-realtek-rtl.c + +--- a/drivers/irqchip/Makefile ++++ b/drivers/irqchip/Makefile +@@ -114,3 +114,4 @@ obj-$(CONFIG_LOONGSON_PCH_PIC) += irq-l + obj-$(CONFIG_LOONGSON_PCH_MSI) += irq-loongson-pch-msi.o + obj-$(CONFIG_MST_IRQ) += irq-mst-intc.o + obj-$(CONFIG_SL28CPLD_INTC) += irq-sl28cpld.o ++obj-$(CONFIG_MACH_REALTEK_RTL) += irq-realtek-rtl.o +--- /dev/null ++++ b/drivers/irqchip/irq-realtek-rtl.c +@@ -0,0 +1,180 @@ ++// SPDX-License-Identifier: GPL-2.0-only ++/* ++ * Copyright (C) 2020 Birger Koblitz <mail@birger-koblitz.de> ++ * Copyright (C) 2020 Bert Vermeulen <bert@biot.com> ++ * Copyright (C) 2020 John Crispin <john@phrozen.org> ++ */ ++ ++#include <linux/of_irq.h> ++#include <linux/irqchip.h> ++#include <linux/spinlock.h> ++#include <linux/of_address.h> ++#include <linux/irqchip/chained_irq.h> ++ ++/* Global Interrupt Mask Register */ ++#define RTL_ICTL_GIMR 0x00 ++/* Global Interrupt Status Register */ ++#define RTL_ICTL_GISR 0x04 ++/* Interrupt Routing Registers */ ++#define RTL_ICTL_IRR0 0x08 ++#define RTL_ICTL_IRR1 0x0c ++#define RTL_ICTL_IRR2 0x10 ++#define RTL_ICTL_IRR3 0x14 ++ ++#define REG(x) (realtek_ictl_base + x) ++ ++static DEFINE_RAW_SPINLOCK(irq_lock); ++static void __iomem *realtek_ictl_base; ++ ++static void realtek_ictl_unmask_irq(struct irq_data *i) ++{ ++ unsigned long flags; ++ u32 value; ++ ++ raw_spin_lock_irqsave(&irq_lock, flags); ++ ++ value = readl(REG(RTL_ICTL_GIMR)); ++ value |= BIT(i->hwirq); ++ writel(value, REG(RTL_ICTL_GIMR)); ++ ++ raw_spin_unlock_irqrestore(&irq_lock, flags); ++} ++ ++static void realtek_ictl_mask_irq(struct irq_data *i) ++{ ++ unsigned long flags; ++ u32 value; ++ ++ raw_spin_lock_irqsave(&irq_lock, flags); ++ ++ value = readl(REG(RTL_ICTL_GIMR)); ++ value &= ~BIT(i->hwirq); ++ writel(value, REG(RTL_ICTL_GIMR)); ++ ++ raw_spin_unlock_irqrestore(&irq_lock, flags); ++} ++ ++static struct irq_chip realtek_ictl_irq = { ++ .name = "realtek-rtl-intc", ++ .irq_mask = realtek_ictl_mask_irq, ++ .irq_unmask = realtek_ictl_unmask_irq, ++}; ++ ++static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) ++{ ++ irq_set_chip_and_handler(hw, &realtek_ictl_irq, handle_level_irq); ++ ++ return 0; ++} ++ ++static const struct irq_domain_ops irq_domain_ops = { ++ .map = intc_map, ++ .xlate = irq_domain_xlate_onecell, ++}; ++ ++static void realtek_irq_dispatch(struct irq_desc *desc) ++{ ++ struct irq_chip *chip = irq_desc_get_chip(desc); ++ struct irq_domain *domain; ++ unsigned int pending; ++ ++ chained_irq_enter(chip, desc); ++ pending = readl(REG(RTL_ICTL_GIMR)) & readl(REG(RTL_ICTL_GISR)); ++ if (unlikely(!pending)) { ++ spurious_interrupt(); ++ goto out; ++ } ++ domain = irq_desc_get_handler_data(desc); ++ generic_handle_irq(irq_find_mapping(domain, __ffs(pending))); ++ ++out: ++ chained_irq_exit(chip, desc); ++} ++ ++/* ++ * SoC interrupts are cascaded to MIPS CPU interrupts according to the ++ * interrupt-map in the device tree. Each SoC interrupt gets 4 bits for ++ * the CPU interrupt in an Interrupt Routing Register. Max 32 SoC interrupts ++ * thus go into 4 IRRs. ++ */ ++static int __init map_interrupts(struct device_node *node, struct irq_domain *domain) ++{ ++ struct device_node *cpu_ictl; ++ const __be32 *imap; ++ u32 imaplen, soc_int, cpu_int, tmp, regs[4]; ++ int ret, i, irr_regs[] = { ++ RTL_ICTL_IRR3, ++ RTL_ICTL_IRR2, ++ RTL_ICTL_IRR1, ++ RTL_ICTL_IRR0, ++ }; ++ u8 mips_irqs_set; ++ ++ ret = of_property_read_u32(node, "#address-cells", &tmp); ++ if (ret || tmp) ++ return -EINVAL; ++ ++ imap = of_get_property(node, "interrupt-map", &imaplen); ++ if (!imap || imaplen % 3) ++ return -EINVAL; ++ ++ mips_irqs_set = 0; ++ memset(regs, 0, sizeof(regs)); ++ for (i = 0; i < imaplen; i += 3 * sizeof(u32)) { ++ soc_int = be32_to_cpup(imap); ++ if (soc_int > 31) ++ return -EINVAL; ++ ++ cpu_ictl = of_find_node_by_phandle(be32_to_cpup(imap + 1)); ++ if (!cpu_ictl) ++ return -EINVAL; ++ ret = of_property_read_u32(cpu_ictl, "#interrupt-cells", &tmp); ++ if (ret || tmp != 1) ++ return -EINVAL; ++ of_node_put(cpu_ictl); ++ ++ cpu_int = be32_to_cpup(imap + 2); ++ if (cpu_int > 7) ++ return -EINVAL; ++ ++ if (!(mips_irqs_set & BIT(cpu_int))) { ++ irq_set_chained_handler_and_data(cpu_int, realtek_irq_dispatch, ++ domain); ++ mips_irqs_set |= BIT(cpu_int); ++ } ++ ++ regs[(soc_int * 4) / 32] |= cpu_int << (soc_int * 4) % 32; ++ imap += 3; ++ } ++ ++ for (i = 0; i < 4; i++) ++ writel(regs[i], REG(irr_regs[i])); ++ ++ return 0; ++} ++ ++static int __init realtek_rtl_of_init(struct device_node *node, struct device_node *parent) ++{ ++ struct irq_domain *domain; ++ int ret; ++ ++ realtek_ictl_base = of_iomap(node, 0); ++ if (!realtek_ictl_base) ++ return -ENXIO; ++ ++ /* Disable all cascaded interrupts */ ++ writel(0, REG(RTL_ICTL_GIMR)); ++ ++ domain = irq_domain_add_simple(node, 32, 0, ++ &irq_domain_ops, NULL); ++ ++ ret = map_interrupts(node, domain); ++ if (ret) { ++ pr_err("invalid interrupt map\n"); ++ return ret; ++ } ++ ++ return 0; ++} ++ ++IRQCHIP_DECLARE(realtek_rtl_intc, "realtek,rtl-intc", realtek_rtl_of_init); |