Re: [PATCH v5 1/3] gpio: xgene: Enable X-Gene standby GPIO as interrupt controller
From: Quan Nguyen <hidden>
Date: 2016-02-11 16:35:36
Also in:
linux-arm-kernel, linux-gpio
On Wed, Feb 10, 2016 at 10:09 PM, Marc Zyngier [off-list ref] wrote:
Quan, This is getting better. Some comments below. On 29/01/16 04:28, Quan Nguyen wrote:quoted
Enable X-Gene standby GPIO controller as interrupt controller to provide its own resources. This avoids ambiguity where GIC interrupt resource is use as X-Gene standby GPIO interrupt resource in user driver. Signed-off-by: Y Vo <redacted> Signed-off-by: Quan Nguyen <redacted> --- drivers/gpio/gpio-xgene-sb.c | 275 ++++++++++++++++++++++++++++++++++++++----- 1 file changed, 243 insertions(+), 32 deletions(-)diff --git a/drivers/gpio/gpio-xgene-sb.c b/drivers/gpio/gpio-xgene-sb.c index 282004d..026da90 100644 --- a/drivers/gpio/gpio-xgene-sb.c +++ b/drivers/gpio/gpio-xgene-sb.c@@ -2,8 +2,9 @@ * AppliedMicro X-Gene SoC GPIO-Standby Driver * * Copyright (c) 2014, Applied Micro Circuits Corporation - * Author: Tin Huynh <tnhuynh-qTEPVZfXA3Y@public.gmane.org>. - * Y Vo <yvo-qTEPVZfXA3Y@public.gmane.org>. + * Author: Tin Huynh <tnhuynh-qTEPVZfXA3Y@public.gmane.org>. + * Y Vo <yvo-qTEPVZfXA3Y@public.gmane.org>. + * Quan Nguyen <qnguyen-qTEPVZfXA3Y@public.gmane.org>. * * 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@@ -28,9 +29,14 @@ #include "gpiolib.h" -#define XGENE_MAX_GPIO_DS 22 -#define XGENE_MAX_GPIO_DS_IRQ 6 +/* Common property names */ +#define XGENE_NIRQ_PROPERTY "apm,nr-irqs" +#define XGENE_NGPIO_PROPERTY "apm,nr-gpios" +#define XGENE_IRQ_START_PROPERTY "apm,irq-start" +#define XGENE_DFLT_MAX_NGPIO 22 +#define XGENE_DFLT_MAX_NIRQ 6 +#define XGENE_DFLT_IRQ_START_PIN 8 #define GPIO_MASK(x) (1U << ((x) % 32)) #define MPA_GPIO_INT_LVL 0x0290@@ -39,19 +45,32 @@ #define MPA_GPIO_IN_ADDR 0x02a4 #define MPA_GPIO_SEL_LO 0x0294 +#define GPIO_INT_LEVEL_H 0x000001 +#define GPIO_INT_LEVEL_L 0x000000 + /** * struct xgene_gpio_sb - GPIO-Standby private data structure. * @gc: memory-mapped GPIO controllers. - * @irq: Mapping GPIO pins and interrupt number - * nirq: Number of GPIO pins that supports interrupt + * @regs: GPIO register base offset + * @irq_domain: GPIO interrupt domain + * @irq_start: GPIO pin that start support interrupt + * @nirq: Number of GPIO pins that supports interrupt + * @parent_irq_base: Start parent HWIRQ */ struct xgene_gpio_sb { struct gpio_chip gc; - u32 *irq; - u32 nirq; + void __iomem *regs; + struct irq_domain *irq_domain; + u16 irq_start; + u16 nirq; + u16 parent_irq_base; }; -static void xgene_gpio_set_bit(struct gpio_chip *gc, void __iomem *reg, u32 gpio, int val) +#define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start) +#define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start) + +static void xgene_gpio_set_bit(struct gpio_chip *gc, + void __iomem *reg, u32 gpio, int val) { u32 data;@@ -63,23 +82,180 @@ static void xgene_gpio_set_bit(struct gpio_chip *gc, void __iomem *reg, u32 gpio gc->write_reg(reg, data); } -static int apm_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio) +static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d); + int gpio = HWIRQ_TO_GPIO(priv, d->hwirq); + int lvl_type = GPIO_INT_LEVEL_H; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_RISING: + case IRQ_TYPE_LEVEL_HIGH: + lvl_type = GPIO_INT_LEVEL_H; + break; + case IRQ_TYPE_EDGE_FALLING: + case IRQ_TYPE_LEVEL_LOW: + lvl_type = GPIO_INT_LEVEL_L; + break; + default: + break; + } + + xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, + gpio * 2, 1); + xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL, + d->hwirq, lvl_type); + + /* Propagate IRQ type setting to parent */ + if (type & IRQ_TYPE_EDGE_BOTH) + return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING); + else + return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); +} + +static void xgene_gpio_sb_irq_shutdown(struct irq_data *d) +{ + struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d); + + gpiochip_unlock_as_irq(&priv->gc, HWIRQ_TO_GPIO(priv, d->hwirq)); +} + +static struct irq_chip xgene_gpio_sb_irq_chip = { + .name = "sbgpio", + .irq_ack = irq_chip_ack_parent,There is no point calling irq_chip_ack_parent, as the GIC doesn't implement an irq_ack method at all.
Thanks Marc, let me remove it.
quoted
+ .irq_eoi = irq_chip_eoi_parent, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_set_type = xgene_gpio_sb_irq_set_type, + .irq_shutdown = xgene_gpio_sb_irq_shutdown, +}; + +static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio) { struct xgene_gpio_sb *priv = gpiochip_get_data(gc); + struct irq_fwspec fwspec; + + if ((gpio < priv->irq_start) || + (gpio > HWIRQ_TO_GPIO(priv, priv->nirq))) + return -ENXIO; + + if (gc->parent->of_node) + fwspec.fwnode = of_node_to_fwnode(gc->parent->of_node); + else + fwspec.fwnode = gc->parent->fwnode; + fwspec.param_count = 2; + fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio); + fwspec.param[1] = IRQ_TYPE_NONE; + return irq_create_fwspec_mapping(&fwspec); +} + +static void xgene_gpio_sb_domain_activate(struct irq_domain *d, + struct irq_data *irq_data) +{ + struct xgene_gpio_sb *priv = d->host_data; + u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq); + + if (gpiochip_lock_as_irq(&priv->gc, gpio)) { + dev_err(priv->gc.parent, + "Unable to configure XGene GPIO standby pin %d as IRQ\n", + gpio); + return; + } + + xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, + gpio * 2, 1); +} + +static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d, + struct irq_data *irq_data) +{ + struct xgene_gpio_sb *priv = d->host_data; + u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq); + + gpiochip_unlock_as_irq(&priv->gc, gpio);Is it right to do the unlock both in irq_shutdown and domain_deactivate? This seems a bit odd to me to have such an inbalance. My hunch is that you should either implement irq_startup, do the locking there and drop the unlock drop deactivate, or kill irq_shutdown. Linus, what do you think?
I refer to kill irq_shutdown.
quoted
+ xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, + gpio * 2, 0); +} - if (priv->irq[gpio]) - return priv->irq[gpio]; +static int xgene_gpio_sb_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + struct xgene_gpio_sb *priv = d->host_data; + + if ((fwspec->param_count != 2) || + (fwspec->param[0] >= priv->nirq)) + return -EINVAL; + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + return 0; +} + +static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct irq_fwspec *fwspec = data; + struct irq_fwspec parent_fwspec; + struct xgene_gpio_sb *priv = domain->host_data; + irq_hw_number_t hwirq; + unsigned int i; + + hwirq = fwspec->param[0]; + for (i = 0; i < nr_irqs; i++) + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, + &xgene_gpio_sb_irq_chip, priv); + + if (is_of_node(domain->parent->fwnode)) { + parent_fwspec.fwnode = domain->parent->fwnode; + parent_fwspec.param_count = 3; + parent_fwspec.param[0] = 0;/* SPI */ + /* Skip SGIs and PPIs*/ + parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32; + parent_fwspec.param[2] = fwspec->param[1]; + } else if (is_fwnode_irqchip(domain->parent->fwnode)) { + parent_fwspec.fwnode = domain->parent->fwnode;nit: You can move this out of the if/else, and always assign the fwnode.
Thanks Marc, let me change it.
quoted
+ parent_fwspec.param_count = 2; + parent_fwspec.param[0] = hwirq + priv->parent_irq_base; + parent_fwspec.param[1] = fwspec->param[1]; + } else + return -EINVAL; - return -ENXIO; + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, + &parent_fwspec); } +static void xgene_gpio_sb_domain_free(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs) +{ + struct irq_data *d; + unsigned int i; + + for (i = 0; i < nr_irqs; i++) { + d = irq_domain_get_irq_data(domain, virq + i); + irq_domain_reset_irq_data(d); + } +} + +static const struct irq_domain_ops xgene_gpio_sb_domain_ops = { + .translate = xgene_gpio_sb_domain_translate, + .alloc = xgene_gpio_sb_domain_alloc, + .free = xgene_gpio_sb_domain_free, + .activate = xgene_gpio_sb_domain_activate, + .deactivate = xgene_gpio_sb_domain_deactivate, +}; + static int xgene_gpio_sb_probe(struct platform_device *pdev) { struct xgene_gpio_sb *priv; - u32 ret, i; - u32 default_lines[] = {0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D}; + u32 ret; struct resource *res; void __iomem *regs; + struct irq_domain *parent_domain = NULL; + struct fwnode_handle *fwnode; + u32 val32; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv)@@ -90,6 +266,18 @@ static int xgene_gpio_sb_probe(struct platform_device *pdev) if (IS_ERR(regs)) return PTR_ERR(regs); + priv->regs = regs; + + ret = platform_get_irq(pdev, 0); + if (ret > 0) { + priv->parent_irq_base = irq_get_irq_data(ret)->hwirq; + parent_domain = irq_get_irq_data(ret)->domain; + } + if (!parent_domain) { + dev_err(&pdev->dev, "unable to obtain parent domain\n"); + return -ENODEV; + } + ret = bgpio_init(&priv->gc, &pdev->dev, 4, regs + MPA_GPIO_IN_ADDR, regs + MPA_GPIO_OUT_ADDR, NULL,@@ -97,30 +285,51 @@ static int xgene_gpio_sb_probe(struct platform_device *pdev) if (ret) return ret; - priv->gc.to_irq = apm_gpio_sb_to_irq; - priv->gc.ngpio = XGENE_MAX_GPIO_DS; + priv->gc.to_irq = xgene_gpio_sb_to_irq; - priv->nirq = XGENE_MAX_GPIO_DS_IRQ; + /* Retrieve start irq pin, use default if property not found */ + priv->irq_start = XGENE_DFLT_IRQ_START_PIN; + if (!device_property_read_u32(&pdev->dev, + XGENE_IRQ_START_PROPERTY, &val32))Is that for ACPI as well?
Yes, Marc.
quoted
+ priv->irq_start = val32; - priv->irq = devm_kzalloc(&pdev->dev, sizeof(u32) * XGENE_MAX_GPIO_DS, - GFP_KERNEL); - if (!priv->irq) - return -ENOMEM; + /* Retrieve number irqs, use default if property not found */ + priv->nirq = XGENE_DFLT_MAX_NIRQ; + if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32)) + priv->nirq = val32; - for (i = 0; i < priv->nirq; i++) { - priv->irq[default_lines[i]] = platform_get_irq(pdev, i); - xgene_gpio_set_bit(&priv->gc, regs + MPA_GPIO_SEL_LO, - default_lines[i] * 2, 1); - xgene_gpio_set_bit(&priv->gc, regs + MPA_GPIO_INT_LVL, i, 1); - } + /* Retrieve number gpio, use default if property not found */ + priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO; + if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32)) + priv->gc.ngpio = val32; + + dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n", + priv->gc.ngpio, priv->nirq, priv->irq_start); platform_set_drvdata(pdev, priv); - ret = gpiochip_add_data(&priv->gc, priv); - if (ret) - dev_err(&pdev->dev, "failed to register X-Gene GPIO Standby driver\n"); + if (pdev->dev.of_node) + fwnode = of_node_to_fwnode(pdev->dev.of_node); else - dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n"); + fwnode = pdev->dev.fwnode; + + priv->irq_domain = irq_domain_create_hierarchy(parent_domain, + 0, priv->nirq, fwnode, + &xgene_gpio_sb_domain_ops, priv); + if (!priv->irq_domain) + return -ENODEV; + + priv->gc.irqdomain = priv->irq_domain; + + ret = gpiochip_add_data(&priv->gc, priv); + if (ret) { + dev_err(&pdev->dev, + "failed to register X-Gene GPIO Standby driver\n"); + irq_domain_remove(priv->irq_domain); + return ret; + } + + dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n"); if (priv->nirq > 0) { /* Register interrupt handlers for gpio signaled acpi events */@@ -138,6 +347,8 @@ static int xgene_gpio_sb_remove(struct platform_device *pdev) acpi_gpiochip_free_interrupts(&priv->gc); } + irq_domain_remove(priv->irq_domain); + gpiochip_remove(&priv->gc); return 0; }Thanks, M. -- Jazz is not dead. It just smells funny...
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