From patchwork Sun Jan 12 08:14:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiaxun Yang X-Patchwork-Id: 11329063 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0311F930 for ; Sun, 12 Jan 2020 08:20:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B76AE214D8 for ; Sun, 12 Jan 2020 08:20:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=flygoat.com header.i=@flygoat.com header.b="eWxJSI36" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732370AbgALIUM (ORCPT ); Sun, 12 Jan 2020 03:20:12 -0500 Received: from forward100o.mail.yandex.net ([37.140.190.180]:60404 "EHLO forward100o.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732369AbgALIUM (ORCPT ); Sun, 12 Jan 2020 03:20:12 -0500 X-Greylist: delayed 332 seconds by postgrey-1.27 at vger.kernel.org; Sun, 12 Jan 2020 03:20:07 EST Received: from forward103q.mail.yandex.net (forward103q.mail.yandex.net [IPv6:2a02:6b8:c0e:50:0:640:b21c:d009]) by forward100o.mail.yandex.net (Yandex) with ESMTP id B438B4AC0146; Sun, 12 Jan 2020 11:14:49 +0300 (MSK) Received: from mxback11q.mail.yandex.net (mxback11q.mail.yandex.net [IPv6:2a02:6b8:c0e:1b4:0:640:1f0c:10f2]) by forward103q.mail.yandex.net (Yandex) with ESMTP id AEAFC61E0011; Sun, 12 Jan 2020 11:14:49 +0300 (MSK) Received: from vla1-ee05250d997a.qloud-c.yandex.net (vla1-ee05250d997a.qloud-c.yandex.net [2a02:6b8:c0d:3495:0:640:ee05:250d]) by mxback11q.mail.yandex.net (mxback/Yandex) with ESMTP id GPYyGPLaLe-EnouUtZJ; Sun, 12 Jan 2020 11:14:49 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=flygoat.com; s=mail; t=1578816889; bh=0NuSIKtmETtBEl6vPK8FE06E3r9xPn7fhFLhkmzxzqg=; h=In-Reply-To:Subject:To:From:Cc:References:Date:Message-Id; b=eWxJSI36KkcBDIQVZ8lHVQVr+P+PSI93GbCsK665Vkg+VaWOYkoM0DNUQxImzI3cz XVOLnpNE0emR23KpUL2IleQS4p1tHLz3WDpahQBF3KGj49bD2kWTYZ3/Idh5fDMq9J RKsBktg3WsVPRPFLXwQStbRDIlvwB+ai8rlVjJAQ= Authentication-Results: mxback11q.mail.yandex.net; dkim=pass header.i=@flygoat.com Received: by vla1-ee05250d997a.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id 3jM5RHRYtF-EeV4Btrp; Sun, 12 Jan 2020 11:14:45 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) From: Jiaxun Yang To: linux-mips@vger.kernel.org Cc: chenhc@lemote.com, paul.burton@mips.com, tglx@linutronix.de, jason@lakedaemon.net, maz@kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, mark.rutland@arm.co, devicetree@vger.kernel.org, Jiaxun Yang Subject: [PATCH v3 02/10] irqchip: Add driver for Loongson I/O interrupt controller Date: Sun, 12 Jan 2020 16:14:08 +0800 Message-Id: <20200112081416.722218-3-jiaxun.yang@flygoat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200112081416.722218-1-jiaxun.yang@flygoat.com> References: <20200112081416.722218-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This controller appeared on Loongson family of chips as the primary package interrupt source. Signed-off-by: Jiaxun Yang --- drivers/irqchip/Kconfig | 9 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-loongson-iointc.c | 338 ++++++++++++++++++++++++++ 3 files changed, 348 insertions(+) create mode 100644 drivers/irqchip/irq-loongson-iointc.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 697e6a8ccaae..3f220648151b 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -499,4 +499,13 @@ config SIFIVE_PLIC If you don't know what to do here, say Y. +config LOONGSON_IOINTC + bool "Loongson I/O Interrupt Controller" + depends on MACH_LOONGSON64 + default y + select IRQ_DOMAIN + select GENERIC_IRQ_CHIP + help + Support for the Loongson I/O Interrupt Controller. + endmenu diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index e806dda690ea..3e98241401b3 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -104,3 +104,4 @@ obj-$(CONFIG_MADERA_IRQ) += irq-madera.o obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o obj-$(CONFIG_TI_SCI_INTA_IRQCHIP) += irq-ti-sci-inta.o +obj-$(CONFIG_LOONGSON_IOINTC) += irq-loongson-iointc.o diff --git a/drivers/irqchip/irq-loongson-iointc.c b/drivers/irqchip/irq-loongson-iointc.c new file mode 100644 index 000000000000..b8deead97bc3 --- /dev/null +++ b/drivers/irqchip/irq-loongson-iointc.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020, Jiaxun Yang + * Loongson IOINTC IRQ support + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define IOINTC_CHIP_IRQ 32 +#define IOINTC_NUM_PARENT 4 + +#define IOINTC_REG_INTx_MAP(x) (x * 0x1) +#define IOINTC_INTC_CHIP_START 0x20 + +#define IOINTC_REG_INTC_STATUS (IOINTC_INTC_CHIP_START + 0x20) +#define IOINTC_REG_INTC_EN_STATUS (IOINTC_INTC_CHIP_START + 0x04) +#define IOINTC_REG_INTC_ENABLE (IOINTC_INTC_CHIP_START + 0x08) +#define IOINTC_REG_INTC_DISABLE (IOINTC_INTC_CHIP_START + 0x0c) +#define IOINTC_REG_INTC_POL (IOINTC_INTC_CHIP_START + 0x10) +#define IOINTC_REG_INTC_EDGE (IOINTC_INTC_CHIP_START + 0x14) + +#define BUGGY_LPC_IRQ 10 + +#define IOINTC_SHIFT_INTx 4 + +struct iointc_handler_data { + struct iointc_priv *priv; + u32 parent_int_map; +}; + +struct iointc_priv { + void __iomem *base; + struct irq_chip_generic *gc; + u8 map_cache[IOINTC_CHIP_IRQ]; + struct iointc_handler_data handler[IOINTC_NUM_PARENT]; + u8 possible_parent_mask; + bool have_lpc_irq_bug; +}; + +static void iointc_chained_handle_irq(struct irq_desc *desc) +{ + struct iointc_handler_data *handler = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irq_chip_generic *gc = handler->priv->gc; + u32 pending; + + chained_irq_enter(chip, desc); + + pending = readl(gc->reg_base + IOINTC_REG_INTC_STATUS); + + if (!pending) { + /* Always blame LPC IRQ if we have that Bug and LPC interrupt enabled */ + if (handler->priv->have_lpc_irq_bug && + (handler->parent_int_map & ~gc->mask_cache & BIT(BUGGY_LPC_IRQ))) + generic_handle_irq(irq_find_mapping(gc->domain, BUGGY_LPC_IRQ)); + else + spurious_interrupt(); + } + + while (pending) { + int bit = __ffs(pending); + + generic_handle_irq(irq_find_mapping(gc->domain, bit)); + pending &= ~BIT(bit); + } + + chained_irq_exit(chip, desc); +} + +static void map_cache_set_core(struct iointc_priv *priv, int irq, int core) +{ + priv->map_cache[irq] &= ~GENMASK(3, 0); + priv->map_cache[irq] |= BIT(core); +} + +static void write_map_cache(struct iointc_priv *priv, int irq) +{ + writeb(priv->map_cache[irq], + priv->base + IOINTC_REG_INTx_MAP(irq)); +} + +static void iointc_set_bit(struct irq_chip_generic *gc, + unsigned int offset, + u32 mask, bool set) +{ + if (set) + writel(readl(gc->reg_base + offset) | mask, + gc->reg_base + offset); + else + writel(readl(gc->reg_base + offset) & ~mask, + gc->reg_base + offset); +} + +static int iointc_set_type(struct irq_data *data, unsigned int type) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + u32 mask = data->mask; + unsigned long flags; + + irq_gc_lock_irqsave(gc, flags); + switch (type) { + case IRQ_TYPE_LEVEL_HIGH: + iointc_set_bit(gc, IOINTC_REG_INTC_EDGE, mask, false); + iointc_set_bit(gc, IOINTC_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_LEVEL_LOW: + iointc_set_bit(gc, IOINTC_REG_INTC_EDGE, mask, false); + iointc_set_bit(gc, IOINTC_REG_INTC_POL, mask, false); + break; + case IRQ_TYPE_EDGE_RISING: + iointc_set_bit(gc, IOINTC_REG_INTC_EDGE, mask, true); + iointc_set_bit(gc, IOINTC_REG_INTC_POL, mask, true); + break; + case IRQ_TYPE_EDGE_FALLING: + iointc_set_bit(gc, IOINTC_REG_INTC_EDGE, mask, true); + iointc_set_bit(gc, IOINTC_REG_INTC_POL, mask, false); + break; + default: + return -EINVAL; + } + irq_gc_unlock_irqrestore(gc, flags); + + irqd_set_trigger_type(data, type); + return 0; +} + +static int iointc_set_affinity(struct irq_data *idata, + const cpumask_t *cpu_mask, bool force) +{ + return -ENAVAIL; +} + +static void iointc_resume(struct irq_chip_generic *gc) +{ + struct iointc_priv *priv = gc->private; + unsigned long flags; + int i; + + irq_gc_lock_irqsave(gc, flags); + /* Revert map cache */ + for (i = 0; i < IOINTC_CHIP_IRQ; i++) + write_map_cache(priv, i); + + /* Revert mask cache again */ + writel(gc->mask_cache, gc->reg_base + IOINTC_REG_INTC_DISABLE); + writel(~gc->mask_cache, gc->reg_base + IOINTC_REG_INTC_ENABLE); + irq_gc_unlock_irqrestore(gc, flags); +} + +static void validate_parent_mask(struct iointc_priv *priv, u32 of_parent_int_map[]) +{ + u32 proceed_mask = 0x0, duplicated_mask = 0x0; + int i; + int fallback_parent = __ffs(priv->possible_parent_mask); + + for (i = 0; i < IOINTC_NUM_PARENT; i++) { + /* Try if the parent is avilable */ + if (!(priv->possible_parent_mask & BIT(i))) + continue; + + priv->handler[i].parent_int_map = of_parent_int_map[i]; + + /* Detect if the IRQ have previously proceed */ + duplicated_mask |= (priv->handler[i].parent_int_map & proceed_mask); + proceed_mask |= priv->handler[i].parent_int_map; + } + + /* Fallback IRQs with no map bit set */ + while (~proceed_mask) { + int bit = __ffs(~proceed_mask); + + pr_warn("loongson-iointc: Found homeless IRQ %d, map to INT%d\n", + bit, fallback_parent); + priv->handler[fallback_parent].parent_int_map |= BIT(bit); + proceed_mask |= BIT(bit); + } + + /* Fallback IRQs with mutiple map bit set */ + while (duplicated_mask) { + int bit = __ffs(duplicated_mask); + + pr_warn("loongson-iointc: IRQ %d have mutiple parents, map to INT%d\n", + bit, fallback_parent); + /* Clear the bit in all parent bits */ + for (i = 0; i < IOINTC_NUM_PARENT; i++) + priv->handler[i].parent_int_map &= ~BIT(bit); + + priv->handler[fallback_parent].parent_int_map |= BIT(bit); + duplicated_mask &= ~BIT(bit); + } + + /* Generate parent INT part of map Cache */ + for (i = 0; i < IOINTC_NUM_PARENT; i++) { + u32 pending = priv->handler[i].parent_int_map; + + while (pending) { + int bit = __ffs(pending); + + priv->map_cache[bit] = BIT(i) << IOINTC_SHIFT_INTx; + pending &= ~BIT(bit); + } + } +} + +static const char *parent_names[] = {"int0", "int1", "int2", "int3"}; + +int __init iointc_of_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_chip_generic *gc; + struct irq_domain *domain; + struct irq_chip_type *ct; + struct iointc_priv *priv; + u32 of_parent_int_map[IOINTC_NUM_PARENT]; + int parent_irq[IOINTC_NUM_PARENT]; + int core = loongson_sysconf.boot_cpu_id; + int i, err = 0; + int sz; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = of_iomap(node, 0); + if (!priv->base) { + err = -ENODEV; + goto out_free_priv; + } + + if (of_device_is_compatible(node, "loongson,iointc-1.0")) + priv->have_lpc_irq_bug = true; + + for (i = 0; i < IOINTC_NUM_PARENT; i++) { + parent_irq[i] = of_irq_get_byname(node, parent_names[i]); + if (parent_irq[i] >= 0) + priv->possible_parent_mask |= BIT(i); + } + + + if (!priv->possible_parent_mask) { + pr_err("loongson-iointc: No parent\n"); + err = -ENOMEM; + goto out_iounmap; + } + + sz = of_property_read_variable_u32_array(node, "loongson,parent_int_map", + &of_parent_int_map[0], IOINTC_NUM_PARENT, + IOINTC_NUM_PARENT); + if (sz < 4) { + pr_err("loongson-iointc: No parent_int_map\n"); + err = -ENODEV; + goto out_iounmap; + } + + /* Setup IRQ domain */ + domain = irq_domain_add_linear(node, 32, + &irq_generic_chip_ops, priv); + if (!domain) { + pr_err("loongson-iointc: cannot add IRQ domain\n"); + err = -ENOMEM; + goto out_iounmap; + } + + err = irq_alloc_domain_generic_chips(domain, 32, 1, + node->full_name, handle_level_irq, + IRQ_NOPROBE, 0, 0); + if (err) { + pr_err("loongson-iointc: unable to register IRQ domain\n"); + err = -ENOMEM; + goto out_free_domain; + } + + + /* Disable all IRQs */ + writel(0xffffffff, priv->base + IOINTC_REG_INTC_DISABLE); + /* Set to level triggered */ + writel(0x0, priv->base + IOINTC_REG_INTC_EDGE); + + validate_parent_mask(priv, &of_parent_int_map[0]); + + for (i = 0; i < IOINTC_CHIP_IRQ; i++) { + map_cache_set_core(priv, i, core); + write_map_cache(priv, i); + } + + gc = irq_get_domain_generic_chip(domain, 0); + gc->private = priv; + gc->reg_base = priv->base; + gc->domain = domain; + gc->resume = iointc_resume; + + ct = gc->chip_types; + ct->regs.enable = IOINTC_REG_INTC_ENABLE; + ct->regs.disable = IOINTC_REG_INTC_DISABLE; + ct->chip.irq_unmask = irq_gc_unmask_enable_reg; + ct->chip.irq_mask = irq_gc_mask_disable_reg; + ct->chip.irq_mask_ack = irq_gc_mask_disable_reg; + ct->chip.irq_set_type = iointc_set_type; + ct->chip.irq_set_affinity = iointc_set_affinity; + + gc->mask_cache = 0xffffffff; + priv->gc = gc; + + for (i = 0; i < IOINTC_NUM_PARENT; i++) { + if (parent_irq[i] < 0) + continue; + + priv->handler[i].priv = priv; + irq_set_chained_handler_and_data(parent_irq[i], + iointc_chained_handle_irq, &priv->handler[i]); + } + + return 0; + +out_free_domain: + irq_domain_remove(domain); +out_iounmap: + iounmap(priv->base); +out_free_priv: + kfree(priv); + + return err; +} + +IRQCHIP_DECLARE(loongson_iointc_1_0, "loongson,iointc-1.0", iointc_of_init); +IRQCHIP_DECLARE(loongson_iointc_1_0a, "loongson,iointc-1.0a", iointc_of_init);