diff options
Diffstat (limited to 'drivers/gpio/gpio-vf610.c')
| -rw-r--r-- | drivers/gpio/gpio-vf610.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c index db95c4b99a74..90fd4bee4821 100644 --- a/drivers/gpio/gpio-vf610.c +++ b/drivers/gpio/gpio-vf610.c @@ -36,7 +36,10 @@ struct vf610_gpio_port { void __iomem *base; void __iomem *gpio_base; u8 irqc[VF610_GPIO_PER_PORT]; + struct platform_device *pdev_wkpu; + s8 fsl_wakeup[VF610_GPIO_PER_PORT]; int irq; + u32 state; }; #define GPIO_PDOR 0x00 @@ -60,6 +63,14 @@ struct vf610_gpio_port { #define PORT_INT_EITHER_EDGE 0xb #define PORT_INT_LOGIC_ONE 0xc +#define WKPU_WISR 0x14 +#define WKPU_IRER 0x18 +#define WKPU_WRER 0x1c +#define WKPU_WIREER 0x28 +#define WKPU_WIFEER 0x2c +#define WKPU_WIFER 0x30 +#define WKPU_WIPUER 0x34 + static struct irq_chip vf610_gpio_irq_chip; static struct vf610_gpio_port *to_vf610_gp(struct gpio_chip *gc) @@ -72,6 +83,11 @@ static const struct of_device_id vf610_gpio_dt_ids[] = { { /* sentinel */ } }; +static const struct of_device_id vf610_wkpu_dt_ids[] = { + { .compatible = "fsl,vf610-wkpu" }, + { /* sentinel */ } +}; + static inline void vf610_gpio_writel(u32 val, void __iomem *reg) { writel_relaxed(val, reg); @@ -147,8 +163,26 @@ static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type) { struct vf610_gpio_port *port = to_vf610_gp(irq_data_get_irq_chip_data(d)); + s8 wkpu_gpio = port->fsl_wakeup[d->hwirq]; u8 irqc; + if (wkpu_gpio >= 0) { + void __iomem *base = platform_get_drvdata(port->pdev_wkpu); + u32 wireer, wifeer; + u32 mask = 1 << wkpu_gpio; + + wireer = vf610_gpio_readl(base + WKPU_WIREER) & ~mask; + wifeer = vf610_gpio_readl(base + WKPU_WIFEER) & ~mask; + + if (type & IRQ_TYPE_EDGE_RISING) + wireer |= mask; + if (type & IRQ_TYPE_EDGE_FALLING) + wifeer |= mask; + + vf610_gpio_writel(wireer, base + WKPU_WIREER); + vf610_gpio_writel(wifeer, base + WKPU_WIFEER); + } + switch (type) { case IRQ_TYPE_EDGE_RISING: irqc = PORT_INT_RISING_EDGE; @@ -202,6 +236,29 @@ static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable) { struct vf610_gpio_port *port = to_vf610_gp(irq_data_get_irq_chip_data(d)); + s8 wkpu_gpio = port->fsl_wakeup[d->hwirq]; + + if (wkpu_gpio >= 0) { + void __iomem *base = NULL; + u32 wrer, irer; + + base = platform_get_drvdata(port->pdev_wkpu); + + /* WKPU wakeup flag for LPSTOPx modes... */ + wrer = vf610_gpio_readl(base + WKPU_WRER); + irer = vf610_gpio_readl(base + WKPU_IRER); + + if (enable) { + wrer |= 1 << wkpu_gpio; + irer |= 1 << wkpu_gpio; + } else { + wrer &= ~(1 << wkpu_gpio); + irer &= ~(1 << wkpu_gpio); + } + + vf610_gpio_writel(wrer, base + WKPU_WRER); + vf610_gpio_writel(irer, base + WKPU_IRER); + } if (enable) enable_irq_wake(port->irq); @@ -220,6 +277,77 @@ static struct irq_chip vf610_gpio_irq_chip = { .irq_set_wake = vf610_gpio_irq_set_wake, }; +static int __maybe_unused vf610_gpio_suspend(struct device *dev) +{ + struct vf610_gpio_port *port = dev_get_drvdata(dev); + + port->state = vf610_gpio_readl(port->gpio_base + GPIO_PDOR); + + /* + * There is no need to store Port state since we maintain the state + * alread in the irqc array + */ + + return 0; +} + +static int __maybe_unused vf610_gpio_resume(struct device *dev) +{ + struct vf610_gpio_port *port = dev_get_drvdata(dev); + int i; + + vf610_gpio_writel(port->state, port->gpio_base + GPIO_PDOR); + + for (i = 0; i < port->gc.ngpio; i++) { + u32 irqc = port->irqc[i] << PORT_PCR_IRQC_OFFSET; + + vf610_gpio_writel(irqc, port->base + PORT_PCR(i)); + } + + return 0; +} + +static const struct dev_pm_ops vf610_gpio_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(vf610_gpio_suspend, vf610_gpio_resume) +}; + +static int vf610_gpio_wkpu(struct device_node *np, struct vf610_gpio_port *port) +{ + struct platform_device *pdev = NULL; + struct of_phandle_args arg; + int i, ret; + + for (i = 0; i < VF610_GPIO_PER_PORT; i++) + port->fsl_wakeup[i] = -1; + + for (i = 0;;i++) { + int gpioid, wakeupid, cnt; + + ret = of_parse_phandle_with_fixed_args(np, "fsl,gpio-wakeup", + 3, i, &arg); + + if (ret == -ENOENT) + break; + + if (!pdev) + pdev = of_find_device_by_node(arg.np); + of_node_put(arg.np); + if (!pdev) + return -EPROBE_DEFER; + + gpioid = arg.args[0]; + wakeupid = arg.args[1]; + cnt = arg.args[2]; + + while (cnt-- && gpioid < VF610_GPIO_PER_PORT) + port->fsl_wakeup[gpioid++] = wakeupid++; + } + + port->pdev_wkpu = pdev; + + return 0; +} + static int vf610_gpio_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -248,6 +376,10 @@ static int vf610_gpio_probe(struct platform_device *pdev) if (port->irq < 0) return port->irq; + ret = vf610_gpio_wkpu(np, port); + if (ret < 0) + return ret; + gc = &port->gc; gc->of_node = np; gc->dev = dev; @@ -282,6 +414,7 @@ static int vf610_gpio_probe(struct platform_device *pdev) } gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq, vf610_gpio_irq_handler); + platform_set_drvdata(pdev, port); return 0; } @@ -289,6 +422,7 @@ static int vf610_gpio_probe(struct platform_device *pdev) static struct platform_driver vf610_gpio_driver = { .driver = { .name = "gpio-vf610", + .pm = &vf610_gpio_pm_ops, .of_match_table = vf610_gpio_dt_ids, }, .probe = vf610_gpio_probe, @@ -300,6 +434,60 @@ static int __init gpio_vf610_init(void) } device_initcall(gpio_vf610_init); +static irqreturn_t vf610_wkpu_irq(int irq, void *data) +{ + void __iomem *base = data; + u32 wisr; + + wisr = vf610_gpio_readl(base + WKPU_WISR); + vf610_gpio_writel(wisr, base + WKPU_WISR); + pr_debug("%s, WKPU interrupt received, flags %08x\n", __func__, wisr); + + return 0; +} + +static int vf610_wkpu_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *iores; + void __iomem *base; + int irq, err; + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, iores); + + if (IS_ERR(base)) + return PTR_ERR(base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + err = devm_request_irq(dev, irq, vf610_wkpu_irq, 0, "wkpu-vf610", base); + if (err) { + dev_err(dev, "Error requesting IRQ!\n"); + return err; + } + + platform_set_drvdata(pdev, base); + + return 0; +} + +static struct platform_driver vf610_wkpu_driver = { + .driver = { + .name = "wkpu-vf610", + .of_match_table = vf610_wkpu_dt_ids, + }, + .probe = vf610_wkpu_probe, +}; + +static int __init vf610_wkpu_init(void) +{ + return platform_driver_register(&vf610_wkpu_driver); +} +device_initcall(vf610_wkpu_init); + MODULE_AUTHOR("Stefan Agner <stefan@agner.ch>"); MODULE_DESCRIPTION("Freescale VF610 GPIO"); MODULE_LICENSE("GPL v2"); |