From: Joel Stanley <joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> To: robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org, marc.zyngier-5wv7dgnIgG8@public.gmane.org Cc: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, jk-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org, andrew-zrmu5oMJ5Fs@public.gmane.org Subject: [PATCH v3 2/2] irqchip: Add irq controller for Aspeed Date: Fri, 13 May 2016 00:13:13 +0930 [thread overview] Message-ID: <1463064193-2178-3-git-send-email-joel@jms.id.au> (raw) In-Reply-To: <1463064193-2178-1-git-send-email-joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> From: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org> Signed-off-by: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org> Signed-off-by: Joel Stanley <joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> --- drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-aspeed-vic.c | 230 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 231 insertions(+) create mode 100644 drivers/irqchip/irq-aspeed-vic.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index b03cfcbbac6b..ec82e6e15a38 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -65,3 +65,4 @@ obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o +obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o diff --git a/drivers/irqchip/irq-aspeed-vic.c b/drivers/irqchip/irq-aspeed-vic.c new file mode 100644 index 000000000000..d24451d5bf8a --- /dev/null +++ b/drivers/irqchip/irq-aspeed-vic.c @@ -0,0 +1,230 @@ +/* + * Copyright (C) 2015 - Ben Herrenschmidt, IBM Corp. + * + * Driver for Aspeed "new" VIC as found in SoC generation 3 and later + * + * Based on irq-vic.c: + * + * Copyright (C) 1999 - 2003 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/export.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/irqdomain.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/syscore_ops.h> +#include <linux/device.h> +#include <linux/slab.h> + +#include <asm/exception.h> +#include <asm/irq.h> + +/* These definitions correspond to the "new mapping" of the + * register set that interleaves "high" and "low". The offsets + * below are for the "low" register, add 4 to get to the high one + */ +#define AVIC_IRQ_STATUS 0x00 +#define AVIC_FIQ_STATUS 0x08 +#define AVIC_RAW_STATUS 0x10 +#define AVIC_INT_SELECT 0x18 +#define AVIC_INT_ENABLE 0x20 +#define AVIC_INT_ENABLE_CLR 0x28 +#define AVIC_INT_TRIGGER 0x30 +#define AVIC_INT_TRIGGER_CLR 0x38 +#define AVIC_INT_SENSE 0x40 +#define AVIC_INT_DUAL_EDGE 0x48 +#define AVIC_INT_EVENT 0x50 +#define AVIC_EDGE_CLR 0x58 +#define AVIC_EDGE_STATUS 0x60 + +#define NUM_IRQS 64 + +struct aspeed_vic { + void __iomem *base; + u32 edge_sources[2]; + struct irq_domain *dom; +}; +static struct aspeed_vic *system_avic; + +static void vic_init_hw(struct aspeed_vic *vic) +{ + u32 sense; + + /* Disable all interrupts */ + writel(0xffffffff, vic->base + AVIC_INT_ENABLE_CLR); + writel(0xffffffff, vic->base + AVIC_INT_ENABLE_CLR + 4); + + /* Make sure no soft trigger is on */ + writel(0xffffffff, vic->base + AVIC_INT_TRIGGER_CLR); + writel(0xffffffff, vic->base + AVIC_INT_TRIGGER_CLR + 4); + + /* Set everything to be IRQ */ + writel(0, vic->base + AVIC_INT_SELECT); + writel(0, vic->base + AVIC_INT_SELECT + 4); + + /* Some interrupts have a programable high/low level trigger + * (4 GPIO direct inputs), for now we assume this was configured + * by firmware. We read which ones are edge now. + */ + sense = readl(vic->base + AVIC_INT_SENSE); + vic->edge_sources[0] = ~sense; + sense = readl(vic->base + AVIC_INT_SENSE + 4); + vic->edge_sources[1] = ~sense; + + /* Clear edge detection latches */ + writel(0xffffffff, vic->base + AVIC_EDGE_CLR); + writel(0xffffffff, vic->base + AVIC_EDGE_CLR + 4); +} + +static void __exception_irq_entry avic_handle_irq(struct pt_regs *regs) +{ + struct aspeed_vic *vic = system_avic; + u32 stat, irq; + + for (;;) { + irq = 0; + stat = readl_relaxed(vic->base + AVIC_IRQ_STATUS); + if (!stat) { + stat = readl_relaxed(vic->base + AVIC_IRQ_STATUS + 4); + irq = 32; + } + if (stat == 0) + break; + irq += ffs(stat) - 1; + handle_domain_irq(vic->dom, irq, regs); + } +} + +static void avic_ack_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + /* Clear edge latch for edge interrupts, nop for level */ + if (vic->edge_sources[sidx] & sbit) + writel(sbit, vic->base + AVIC_EDGE_CLR + sidx * 4); +} + +static void avic_mask_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + writel(sbit, vic->base + AVIC_INT_ENABLE_CLR + sidx * 4); +} + +static void avic_unmask_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + writel(sbit, vic->base + AVIC_INT_ENABLE + sidx * 4); +} + +/* For level irq, faster than going through a nop "ack" and mask */ +static void avic_mask_ack_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + /* First mask */ + writel(sbit, vic->base + AVIC_INT_ENABLE_CLR + sidx * 4); + + /* Then clear edge latch for edge interrupts */ + if (vic->edge_sources[sidx] & sbit) + writel(sbit, vic->base + AVIC_EDGE_CLR + sidx * 4); +} + +static struct irq_chip avic_chip = { + .name = "AVIC", + .irq_ack = avic_ack_irq, + .irq_mask = avic_mask_irq, + .irq_unmask = avic_unmask_irq, + .irq_mask_ack = avic_mask_ack_irq, +}; + +static int avic_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct aspeed_vic *vic = d->host_data; + unsigned int sidx = hwirq >> 5; + unsigned int sbit = 1u << (hwirq & 0x1f); + + /* Check if interrupt exists */ + if (sidx > 1) + return -EPERM; + + if (vic->edge_sources[sidx] & sbit) + irq_set_chip_and_handler(irq, &avic_chip, handle_edge_irq); + else + irq_set_chip_and_handler(irq, &avic_chip, handle_level_irq); + irq_set_chip_data(irq, vic); + irq_set_probe(irq); + return 0; +} + +static struct irq_domain_ops avic_dom_ops = { + .map = avic_map, + .xlate = irq_domain_xlate_onetwocell, +}; + +static int __init avic_of_init(struct device_node *node, + struct device_node *parent) +{ + void __iomem *regs; + struct aspeed_vic *vic; + + if (WARN(parent, "non-root Aspeed VIC not supported")) + return -EINVAL; + if (WARN(system_avic, "duplicate Aspeed VIC not supported")) + return -EINVAL; + + regs = of_iomap(node, 0); + if (WARN_ON(!regs)) + return -EIO; + + vic = kzalloc(sizeof(struct aspeed_vic), GFP_KERNEL); + if (WARN_ON(!vic)) { + iounmap(regs); + return -ENOMEM; + } + vic->base = regs; + + /* Initialize soures, all masked */ + vic_init_hw(vic); + + /* Ready to receive interrupts */ + system_avic = vic; + set_handle_irq(avic_handle_irq); + + /* Register our domain */ + vic->dom = irq_domain_add_simple(node, NUM_IRQS, 0, + &avic_dom_ops, vic); + + return 0; +} + +IRQCHIP_DECLARE(aspeed_new_vic, "aspeed,ast2400-vic", avic_of_init); -- 2.8.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: joel@jms.id.au (Joel Stanley) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 2/2] irqchip: Add irq controller for Aspeed Date: Fri, 13 May 2016 00:13:13 +0930 [thread overview] Message-ID: <1463064193-2178-3-git-send-email-joel@jms.id.au> (raw) In-Reply-To: <1463064193-2178-1-git-send-email-joel@jms.id.au> From: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Joel Stanley <joel@jms.id.au> --- drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-aspeed-vic.c | 230 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 231 insertions(+) create mode 100644 drivers/irqchip/irq-aspeed-vic.c diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index b03cfcbbac6b..ec82e6e15a38 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -65,3 +65,4 @@ obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o obj-$(CONFIG_PIC32_EVIC) += irq-pic32-evic.o obj-$(CONFIG_MVEBU_ODMI) += irq-mvebu-odmi.o +obj-$(CONFIG_ARCH_ASPEED) += irq-aspeed-vic.o diff --git a/drivers/irqchip/irq-aspeed-vic.c b/drivers/irqchip/irq-aspeed-vic.c new file mode 100644 index 000000000000..d24451d5bf8a --- /dev/null +++ b/drivers/irqchip/irq-aspeed-vic.c @@ -0,0 +1,230 @@ +/* + * Copyright (C) 2015 - Ben Herrenschmidt, IBM Corp. + * + * Driver for Aspeed "new" VIC as found in SoC generation 3 and later + * + * Based on irq-vic.c: + * + * Copyright (C) 1999 - 2003 ARM Limited + * Copyright (C) 2000 Deep Blue Solutions Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/export.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/irqdomain.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/syscore_ops.h> +#include <linux/device.h> +#include <linux/slab.h> + +#include <asm/exception.h> +#include <asm/irq.h> + +/* These definitions correspond to the "new mapping" of the + * register set that interleaves "high" and "low". The offsets + * below are for the "low" register, add 4 to get to the high one + */ +#define AVIC_IRQ_STATUS 0x00 +#define AVIC_FIQ_STATUS 0x08 +#define AVIC_RAW_STATUS 0x10 +#define AVIC_INT_SELECT 0x18 +#define AVIC_INT_ENABLE 0x20 +#define AVIC_INT_ENABLE_CLR 0x28 +#define AVIC_INT_TRIGGER 0x30 +#define AVIC_INT_TRIGGER_CLR 0x38 +#define AVIC_INT_SENSE 0x40 +#define AVIC_INT_DUAL_EDGE 0x48 +#define AVIC_INT_EVENT 0x50 +#define AVIC_EDGE_CLR 0x58 +#define AVIC_EDGE_STATUS 0x60 + +#define NUM_IRQS 64 + +struct aspeed_vic { + void __iomem *base; + u32 edge_sources[2]; + struct irq_domain *dom; +}; +static struct aspeed_vic *system_avic; + +static void vic_init_hw(struct aspeed_vic *vic) +{ + u32 sense; + + /* Disable all interrupts */ + writel(0xffffffff, vic->base + AVIC_INT_ENABLE_CLR); + writel(0xffffffff, vic->base + AVIC_INT_ENABLE_CLR + 4); + + /* Make sure no soft trigger is on */ + writel(0xffffffff, vic->base + AVIC_INT_TRIGGER_CLR); + writel(0xffffffff, vic->base + AVIC_INT_TRIGGER_CLR + 4); + + /* Set everything to be IRQ */ + writel(0, vic->base + AVIC_INT_SELECT); + writel(0, vic->base + AVIC_INT_SELECT + 4); + + /* Some interrupts have a programable high/low level trigger + * (4 GPIO direct inputs), for now we assume this was configured + * by firmware. We read which ones are edge now. + */ + sense = readl(vic->base + AVIC_INT_SENSE); + vic->edge_sources[0] = ~sense; + sense = readl(vic->base + AVIC_INT_SENSE + 4); + vic->edge_sources[1] = ~sense; + + /* Clear edge detection latches */ + writel(0xffffffff, vic->base + AVIC_EDGE_CLR); + writel(0xffffffff, vic->base + AVIC_EDGE_CLR + 4); +} + +static void __exception_irq_entry avic_handle_irq(struct pt_regs *regs) +{ + struct aspeed_vic *vic = system_avic; + u32 stat, irq; + + for (;;) { + irq = 0; + stat = readl_relaxed(vic->base + AVIC_IRQ_STATUS); + if (!stat) { + stat = readl_relaxed(vic->base + AVIC_IRQ_STATUS + 4); + irq = 32; + } + if (stat == 0) + break; + irq += ffs(stat) - 1; + handle_domain_irq(vic->dom, irq, regs); + } +} + +static void avic_ack_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + /* Clear edge latch for edge interrupts, nop for level */ + if (vic->edge_sources[sidx] & sbit) + writel(sbit, vic->base + AVIC_EDGE_CLR + sidx * 4); +} + +static void avic_mask_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + writel(sbit, vic->base + AVIC_INT_ENABLE_CLR + sidx * 4); +} + +static void avic_unmask_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + writel(sbit, vic->base + AVIC_INT_ENABLE + sidx * 4); +} + +/* For level irq, faster than going through a nop "ack" and mask */ +static void avic_mask_ack_irq(struct irq_data *d) +{ + struct aspeed_vic *vic = irq_data_get_irq_chip_data(d); + unsigned int sidx = d->hwirq >> 5; + unsigned int sbit = 1u << (d->hwirq & 0x1f); + + /* First mask */ + writel(sbit, vic->base + AVIC_INT_ENABLE_CLR + sidx * 4); + + /* Then clear edge latch for edge interrupts */ + if (vic->edge_sources[sidx] & sbit) + writel(sbit, vic->base + AVIC_EDGE_CLR + sidx * 4); +} + +static struct irq_chip avic_chip = { + .name = "AVIC", + .irq_ack = avic_ack_irq, + .irq_mask = avic_mask_irq, + .irq_unmask = avic_unmask_irq, + .irq_mask_ack = avic_mask_ack_irq, +}; + +static int avic_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hwirq) +{ + struct aspeed_vic *vic = d->host_data; + unsigned int sidx = hwirq >> 5; + unsigned int sbit = 1u << (hwirq & 0x1f); + + /* Check if interrupt exists */ + if (sidx > 1) + return -EPERM; + + if (vic->edge_sources[sidx] & sbit) + irq_set_chip_and_handler(irq, &avic_chip, handle_edge_irq); + else + irq_set_chip_and_handler(irq, &avic_chip, handle_level_irq); + irq_set_chip_data(irq, vic); + irq_set_probe(irq); + return 0; +} + +static struct irq_domain_ops avic_dom_ops = { + .map = avic_map, + .xlate = irq_domain_xlate_onetwocell, +}; + +static int __init avic_of_init(struct device_node *node, + struct device_node *parent) +{ + void __iomem *regs; + struct aspeed_vic *vic; + + if (WARN(parent, "non-root Aspeed VIC not supported")) + return -EINVAL; + if (WARN(system_avic, "duplicate Aspeed VIC not supported")) + return -EINVAL; + + regs = of_iomap(node, 0); + if (WARN_ON(!regs)) + return -EIO; + + vic = kzalloc(sizeof(struct aspeed_vic), GFP_KERNEL); + if (WARN_ON(!vic)) { + iounmap(regs); + return -ENOMEM; + } + vic->base = regs; + + /* Initialize soures, all masked */ + vic_init_hw(vic); + + /* Ready to receive interrupts */ + system_avic = vic; + set_handle_irq(avic_handle_irq); + + /* Register our domain */ + vic->dom = irq_domain_add_simple(node, NUM_IRQS, 0, + &avic_dom_ops, vic); + + return 0; +} + +IRQCHIP_DECLARE(aspeed_new_vic, "aspeed,ast2400-vic", avic_of_init); -- 2.8.1
next prev parent reply other threads:[~2016-05-12 14:43 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <462797239-14765-1-git-send-email-joel@jms.id.au> 2016-05-09 13:58 ` [PATCH v2 0/2] irqchip: Support Aspeed IRQ controller Joel Stanley 2016-05-09 13:58 ` Joel Stanley 2016-05-09 13:58 ` [PATCH v2 1/2] doc/devicetree: Add Aspeed VIC bindings Joel Stanley 2016-05-09 13:58 ` Joel Stanley [not found] ` <1462802317-27086-2-git-send-email-joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> 2016-05-11 14:33 ` Rob Herring 2016-05-11 14:33 ` Rob Herring 2016-05-12 1:01 ` Benjamin Herrenschmidt 2016-05-12 1:01 ` Benjamin Herrenschmidt [not found] ` <1463014882.20290.203.camel-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org> 2016-05-12 17:20 ` Rob Herring 2016-05-12 17:20 ` Rob Herring [not found] ` <CAL_JsqJDGmvDxm1kN1w6NQZs0JLeA-V=X_BWi=VOaMTwftLn-w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-05-18 13:50 ` Joel Stanley 2016-05-18 13:50 ` Joel Stanley [not found] ` <CACPK8Xe6TDdV3dC=gizXLxLjUziDFhsupUbXSuYsn6bcrAxahQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2016-05-20 20:13 ` Rob Herring 2016-05-20 20:13 ` Rob Herring [not found] ` <1462802317-27086-1-git-send-email-joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> 2016-05-09 13:58 ` [PATCH v2 2/2] irqchip: Add irq controller for Aspeed Joel Stanley 2016-05-09 13:58 ` Joel Stanley 2016-05-12 14:43 ` [PATCH v3 0/2] irqchip: Support Aspeed IRQ controller Joel Stanley 2016-05-12 14:43 ` Joel Stanley [not found] ` <1463064193-2178-1-git-send-email-joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org> 2016-05-12 14:43 ` [PATCH v3 1/2] doc/devicetree: Add Aspeed VIC bindings Joel Stanley 2016-05-12 14:43 ` Joel Stanley 2016-05-12 14:43 ` Joel Stanley [this message] 2016-05-12 14:43 ` [PATCH v3 2/2] irqchip: Add irq controller for Aspeed Joel Stanley 2016-06-22 18:53 ` [PATCH v3 0/2] irqchip: Support Aspeed IRQ controller Jason Cooper 2016-06-22 18:53 ` Jason Cooper
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