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[209.132.180.67]) by mx.google.com with ESMTP id t2-v6si13066681plq.287.2018.09.16.12.10.56; Sun, 16 Sep 2018 12:11:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728499AbeIQAcS (ORCPT + 99 others); Sun, 16 Sep 2018 20:32:18 -0400 Received: from foss.arm.com ([217.140.101.70]:49746 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728411AbeIQAcS (ORCPT ); Sun, 16 Sep 2018 20:32:18 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3E6CD7A9; Sun, 16 Sep 2018 12:08:23 -0700 (PDT) Received: from big-swifty.misterjones.org (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6386C3F5BD; Sun, 16 Sep 2018 12:08:15 -0700 (PDT) Date: Sun, 16 Sep 2018 20:07:55 +0100 Message-ID: <86in35mfas.wl-marc.zyngier@arm.com> From: Marc Zyngier To: Guo Ren Cc: , , , , , Subject: Re: [PATCH V5 1/3] irqchip: add C-SKY irqchip drivers In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 EasyPG/1.0.0 Emacs/25.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Organization: ARM Ltd MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 16 Sep 2018 09:50:02 +0100, Guo Ren wrote: > > This patch add C-SKY two interrupt conrollers. > > - irq-csky-apb-intc is a simple SOC interrupt controller which is > used in a lot of C-SKY SOC products. > > - irq-csky-mpintc is C-SKY smp system interrupt controller and it > could support 16 soft irqs, 16 private irqs, and 992 max common > irqs. > > Changelog: > - add support-pulse-signal in irq-csky-apb-intc.c > - change name with upstream feed-back > - remove CSKY_VECIRQ_LEGENCY > - change irq map, reserve soft_irq & private_irq space > - add License and Copyright > - change to generic irq chip framework > - support set_affinity for irq balance in SMP > - add INTC_IFR to clear irq-pending > - use irq_domain_add_linear instead of leagcy > > Signed-off-by: Guo Ren > --- > drivers/irqchip/Kconfig | 16 +++ > drivers/irqchip/Makefile | 2 + > drivers/irqchip/irq-csky-mpintc.c | 191 ++++++++++++++++++++++++++++ > irq-csky-apb-intc.c | 260 ++++++++++++++++++++++++++++++++++++++ > 4 files changed, 469 insertions(+) > create mode 100644 drivers/irqchip/irq-csky-mpintc.c > create mode 100644 irq-csky-apb-intc.c > > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig > index 383e7b7..bf12549 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -371,6 +371,22 @@ config QCOM_PDC > Power Domain Controller driver to manage and configure wakeup > IRQs for Qualcomm Technologies Inc (QTI) mobile chips. > > +config CSKY_MPINTC > + bool "C-SKY Multi Processor Interrupt Controller" > + depends on CSKY > + help > + Say yes here to enable C-SKY SMP interrupt controller driver used > + for C-SKY SMP system. In fact it's not mmio map and it use ld/st > + to visit the controller's register inside CPU. > + > +config CSKY_APB_INTC > + bool "C-SKY APB Interrupt Controller" > + depends on CSKY > + help > + Say yes here to enable C-SKY APB interrupt controller driver used > + by C-SKY single core SOC system. It use mmio map apb-bus to visit > + the controller's register. > + > endmenu > > config SIFIVE_PLIC > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index fbd1ec8..72eaf53 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -87,4 +87,6 @@ obj-$(CONFIG_MESON_IRQ_GPIO) += irq-meson-gpio.o > obj-$(CONFIG_GOLDFISH_PIC) += irq-goldfish-pic.o > obj-$(CONFIG_NDS32) += irq-ativic32.o > obj-$(CONFIG_QCOM_PDC) += qcom-pdc.o > +obj-$(CONFIG_CSKY_MPINTC) += irq-csky-mpintc.o > +obj-$(CONFIG_CSKY_APB_INTC) += irq-csky-apb-intc.o > obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o > diff --git a/drivers/irqchip/irq-csky-mpintc.c b/drivers/irqchip/irq-csky-mpintc.c > new file mode 100644 > index 0000000..2b2f75c > --- /dev/null > +++ b/drivers/irqchip/irq-csky-mpintc.c > @@ -0,0 +1,191 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +static void __iomem *INTCG_base; > +static void __iomem *INTCL_base; > + > +#define COMM_IRQ_BASE 32 > + > +#define INTCG_SIZE 0x8000 > +#define INTCL_SIZE 0x1000 > +#define INTC_SIZE INTCL_SIZE*nr_cpu_ids + INTCG_SIZE > + > +#define INTCG_ICTLR 0x0 > +#define INTCG_CICFGR 0x100 > +#define INTCG_CIDSTR 0x1000 > + > +#define INTCL_PICTLR 0x0 > +#define INTCL_SIGR 0x60 > +#define INTCL_HPPIR 0x68 > +#define INTCL_RDYIR 0x6c > +#define INTCL_SENR 0xa0 > +#define INTCL_CENR 0xa4 > +#define INTCL_CACR 0xb4 > + > +#define INTC_IRQS 256 > + > +static DEFINE_PER_CPU(void __iomem *, intcl_reg); > + > +static void csky_mpintc_handler(struct pt_regs *regs) > +{ > + void __iomem *reg_base = this_cpu_read(intcl_reg); > + > + do { > + handle_domain_irq(NULL, It is definitely odd to call into handle_domain_irq without a domain. A new architecture (which C-SKY apparently is) shouldn't depend on this, and should always provide a domain. > + readl_relaxed(reg_base + INTCL_RDYIR), > + regs); > + } while (readl_relaxed(reg_base + INTCL_HPPIR) & BIT(31)); > +} > + > +static void csky_mpintc_enable(struct irq_data *d) > +{ > + void __iomem *reg_base = this_cpu_read(intcl_reg); > + > + writel_relaxed(d->hwirq, reg_base + INTCL_SENR); > +} > + > +static void csky_mpintc_disable(struct irq_data *d) > +{ > + void __iomem *reg_base = this_cpu_read(intcl_reg); > + > + writel_relaxed(d->hwirq, reg_base + INTCL_CENR); > +} > + > +static void csky_mpintc_eoi(struct irq_data *d) > +{ > + void __iomem *reg_base = this_cpu_read(intcl_reg); > + > + writel_relaxed(d->hwirq, reg_base + INTCL_CACR); > +} > + > +#ifdef CONFIG_SMP > +static int csky_irq_set_affinity(struct irq_data *d, > + const struct cpumask *mask_val, > + bool force) > +{ > + unsigned int cpu; > + unsigned int offset = 4 * (d->hwirq - COMM_IRQ_BASE); > + > + if (!force) > + cpu = cpumask_any_and(mask_val, cpu_online_mask); > + else > + cpu = cpumask_first(mask_val); > + > + if (cpu >= nr_cpu_ids) > + return -EINVAL; > + > + /* Enable interrupt destination */ > + cpu |= BIT(31); > + > + writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset); > + > + irq_data_update_effective_affinity(d, cpumask_of(cpu)); > + > + return IRQ_SET_MASK_OK_DONE; > +} > +#endif > + > +static struct irq_chip csky_irq_chip = { > + .name = "C-SKY SMP Intc V2", > + .irq_eoi = csky_mpintc_eoi, > + .irq_enable = csky_mpintc_enable, > + .irq_disable = csky_mpintc_disable, > +#ifdef CONFIG_SMP > + .irq_set_affinity = csky_irq_set_affinity, > +#endif > +}; > + > +static int csky_irqdomain_map(struct irq_domain *d, unsigned int irq, > + irq_hw_number_t hwirq) > +{ > + if(hwirq < COMM_IRQ_BASE) { > + irq_set_percpu_devid(irq); > + irq_set_chip_and_handler(irq, &csky_irq_chip, handle_percpu_irq); > + } else { > + irq_set_chip_and_handler(irq, &csky_irq_chip, handle_fasteoi_irq); > + } > + > + return 0; > +} > + > +static const struct irq_domain_ops csky_irqdomain_ops = { > + .map = csky_irqdomain_map, > + .xlate = irq_domain_xlate_onecell, > +}; > + > +#ifdef CONFIG_SMP > +static void csky_mpintc_send_ipi(const unsigned long *mask, unsigned long irq) > +{ > + void __iomem *reg_base = this_cpu_read(intcl_reg); > + > + /* > + * INTCL_SIGR[3:0] INTID > + * INTCL_SIGR[8:15] CPUMASK > + */ > + writel_relaxed((*mask) << 8 | irq, reg_base + INTCL_SIGR); > +} > +#endif > + > +/* C-SKY multi processor interrupt controller */ > +static int __init > +csky_mpintc_init(struct device_node *node, struct device_node *parent) > +{ > + struct irq_domain *root_domain; > + unsigned int cpu, nr_irq; > + int ret; > + > + if (parent) > + return 0; > + > + ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq); > + if (ret < 0) { > + nr_irq = INTC_IRQS; > + } Drop the extra braces. > + > + if (INTCG_base == NULL) { > + INTCG_base = ioremap(mfcr("cr<31, 14>"), INTC_SIZE); > + if (INTCG_base == NULL) > + return -EIO; > + > + INTCL_base = INTCG_base + INTCG_SIZE; > + > + writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR); > + } > + > + root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops, > + NULL); > + if (!root_domain) > + return -ENXIO; > + > + irq_set_default_host(root_domain); Please drop this. There is no reason to use this on any modern, DT based architecture. > + > + /* for every cpu */ > + for_each_present_cpu(cpu) { > + per_cpu(intcl_reg, cpu) = INTCL_base + (INTCL_SIZE * cpu); > + writel_relaxed(BIT(0), per_cpu(intcl_reg, cpu) + INTCL_PICTLR); > + } > + > + set_handle_irq(&csky_mpintc_handler); > + > +#ifdef CONFIG_SMP > + set_send_ipi(&csky_mpintc_send_ipi); > +#endif > + > + return 0; > +} > +IRQCHIP_DECLARE(csky_mpintc, "csky,mpintc", csky_mpintc_init); > diff --git a/irq-csky-apb-intc.c b/irq-csky-apb-intc.c > new file mode 100644 > index 0000000..d56e6b5 > --- /dev/null > +++ b/irq-csky-apb-intc.c This is a separate driver, right? Please make it a separate patch. > @@ -0,0 +1,260 @@ > +// SPDX-License-Identifier: GPL-2.0 > +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define INTC_IRQS 64 > + > +#define CK_INTC_ICR 0x00 > +#define CK_INTC_PEN31_00 0x14 > +#define CK_INTC_PEN63_32 0x2c > +#define CK_INTC_NEN31_00 0x10 > +#define CK_INTC_NEN63_32 0x28 > +#define CK_INTC_SOURCE 0x40 > +#define CK_INTC_DUAL_BASE 0x100 > + > +#define GX_INTC_PEN31_00 0x00 > +#define GX_INTC_PEN63_32 0x04 > +#define GX_INTC_NEN31_00 0x40 > +#define GX_INTC_NEN63_32 0x44 > +#define GX_INTC_NMASK31_00 0x50 > +#define GX_INTC_NMASK63_32 0x54 > +#define GX_INTC_SOURCE 0x60 > + > +static void __iomem *reg_base; > +static struct irq_domain *root_domain; > + > +static int nr_irq = INTC_IRQS; > + > +/* > + * When controller support pulse signal, the PEN_reg will hold on signal > + * without software trigger. > + * > + * So, to support pulse signal we need to clear IFR_reg and the address of > + * IFR_offset is NEN_offset - 8. > + */ > +static void irq_ck_mask_set_bit(struct irq_data *d) > +{ > + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); > + struct irq_chip_type *ct = irq_data_get_chip_type(d); > + unsigned long ifr = ct->regs.mask - 8; > + u32 mask = d->mask; > + > + irq_gc_lock(gc); > + *ct->mask_cache |= mask; > + irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask); > + irq_reg_writel(gc, irq_reg_readl(gc, ifr) & ~mask, ifr); > + irq_gc_unlock(gc); > +} > + > +static void __init ck_set_gc(struct device_node *node, void __iomem *reg_base, > + u32 mask_reg, u32 irq_base) > +{ > + struct irq_chip_generic *gc; > + > + gc = irq_get_domain_generic_chip(root_domain, irq_base); > + gc->reg_base = reg_base; > + gc->chip_types[0].regs.mask = mask_reg; > + gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; > + gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; > + > + if (of_find_property(node, "support-pulse-signal", NULL)) > + gc->chip_types[0].chip.irq_unmask = irq_ck_mask_set_bit; > +} > + > +static inline u32 build_channel_val(u32 idx, u32 magic) > +{ > + u32 res; > + > + /* > + * Set the same index for each channel > + */ > + res = idx | (idx << 8) | (idx << 16) | (idx << 24); > + > + /* > + * Set the channel magic number in descending order. > + * The magic is 0x00010203 for ck-intc > + * The magic is 0x03020100 for gx6605s-intc > + */ > + return res | magic; > +} > + > +static inline void setup_irq_channel(u32 magic, void __iomem *reg_addr) > +{ > + u32 i; > + > + /* Setup 64 channel slots */ > + for (i = 0; i < INTC_IRQS; i += 4) { > + writel_relaxed(build_channel_val(i, magic), reg_addr + i); > + } > +} > + > +static int __init > +ck_intc_init_comm(struct device_node *node, struct device_node *parent) > +{ > + int ret; > + > + if (parent) { > + pr_err("C-SKY Intc not a root irq controller\n"); > + return -EINVAL; > + } > + > + reg_base = of_iomap(node, 0); > + if (!reg_base) { > + pr_err("C-SKY Intc unable to map: %p.\n", node); > + return -EINVAL; > + } > + > + root_domain = irq_domain_add_linear(node, nr_irq, &irq_generic_chip_ops, NULL); > + if (!root_domain) { > + pr_err("C-SKY Intc irq_domain_add failed.\n"); > + return -ENOMEM; > + } > + > + ret = irq_alloc_domain_generic_chips(root_domain, 32, 1, > + "csky_intc", handle_level_irq, > + IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, > + 0, 0); > + if (ret) { > + pr_err("C-SKY Intc irq_alloc_gc failed.\n"); > + return -ENOMEM; > + } > + > + return 0; > +} > + > +static inline int handle_irq_perbit(struct pt_regs *regs, u32 hwirq, u32 irq_base) Consider using bool as the return type, and use true/false as return values. > +{ > + u32 irq; > + > + if (hwirq == 0) return 0; > + > + while (hwirq) { > + irq = __ffs(hwirq); > + hwirq &= ~BIT(irq); > + handle_domain_irq(root_domain, irq_base + irq, regs); > + } > + > + return 1; > +} > + > +/* gx6605s 64 irqs interrupt controller */ > +static void gx_irq_handler(struct pt_regs *regs) > +{ > + int ret; bool. > + > + do { > + ret = handle_irq_perbit(regs ,readl_relaxed(reg_base + GX_INTC_PEN31_00), 0); > + ret |= handle_irq_perbit(regs ,readl_relaxed(reg_base + GX_INTC_PEN63_32), 32); > + } while(ret); > +} > + > +static int __init > +gx_intc_init(struct device_node *node, struct device_node *parent) > +{ > + int ret; > + > + ret = ck_intc_init_comm(node, parent); > + if (ret) > + return ret; > + > + /* Initial enable reg to disable all interrupts */ > + writel_relaxed(0x0, reg_base + GX_INTC_NEN31_00); > + writel_relaxed(0x0, reg_base + GX_INTC_NEN63_32); > + > + /* Initial mask reg with all unmasked, becasue we only use enalbe reg */ > + writel_relaxed(0x0, reg_base + GX_INTC_NMASK31_00); > + writel_relaxed(0x0, reg_base + GX_INTC_NMASK63_32); > + > + setup_irq_channel(0x03020100, reg_base + GX_INTC_SOURCE); > + > + ck_set_gc(node, reg_base, GX_INTC_NEN31_00, 0); > + ck_set_gc(node, reg_base, GX_INTC_NEN63_32, 32); > + > + set_handle_irq(gx_irq_handler); > + > + return 0; > +} > +IRQCHIP_DECLARE(csky_gx6605s_intc, "csky,gx6605s-intc", gx_intc_init); > + > +/* C-SKY simple 64 irqs interrupt controller, dual-together could support 128 irqs */ > +static void ck_irq_handler(struct pt_regs *regs) > +{ > + int ret; bool. > + > + do { > + /* handle 0 - 31 irqs */ > + ret = handle_irq_perbit(regs, readl_relaxed(reg_base + CK_INTC_PEN31_00), 0); > + ret |= handle_irq_perbit(regs, readl_relaxed(reg_base + CK_INTC_PEN63_32), 32); > + > + if (nr_irq == INTC_IRQS) continue; > + > + /* handle 64 - 127 irqs */ > + ret |= handle_irq_perbit(regs, > + readl_relaxed(reg_base + CK_INTC_PEN31_00 + CK_INTC_DUAL_BASE), 64); > + ret |= handle_irq_perbit(regs, > + readl_relaxed(reg_base + CK_INTC_PEN63_32 + CK_INTC_DUAL_BASE), 96); > + } while(ret); > +} > + > +static int __init > +ck_intc_init(struct device_node *node, struct device_node *parent) > +{ > + int ret; > + > + ret = ck_intc_init_comm(node, parent); > + if (ret) > + return ret; > + > + /* Initial enable reg to disable all interrupts */ > + writel_relaxed(0, reg_base + CK_INTC_NEN31_00); > + writel_relaxed(0, reg_base + CK_INTC_NEN63_32); > + > + /* Enable irq intc */ > + writel_relaxed(BIT(31), reg_base + CK_INTC_ICR); > + > + ck_set_gc(node, reg_base, CK_INTC_NEN31_00, 0); > + ck_set_gc(node, reg_base, CK_INTC_NEN63_32, 32); > + > + setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE); > + > + set_handle_irq(ck_irq_handler); > + > + return 0; > +} > +IRQCHIP_DECLARE(ck_intc, "csky,apb-intc", ck_intc_init); > + > +static int __init > +ck_dual_intc_init(struct device_node *node, struct device_node *parent) > +{ > + int ret; > + > + /* dual-apb-intc up to 128 irq sources*/ > + nr_irq = INTC_IRQS * 2; > + > + ret = ck_intc_init(node, parent); > + if (ret) > + return ret; > + > + /* Initial enable reg to disable all interrupts */ > + writel_relaxed(0, reg_base + CK_INTC_NEN31_00 + CK_INTC_DUAL_BASE); > + writel_relaxed(0, reg_base + CK_INTC_NEN63_32 + CK_INTC_DUAL_BASE); > + > + ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN31_00, 64); > + ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN63_32, 96); > + > + setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE + CK_INTC_DUAL_BASE); > + > + return 0; > +} > +IRQCHIP_DECLARE(ck_dual_intc, "csky,dual-apb-intc", ck_dual_intc_init); > -- > 2.7.4 > Thanks, M. -- Jazz is not dead, it just smell funny.