/* * MXC GPIO support. (c) 2008 Daniel Mack * Copyright 2008 Juergen Beisert, kernel@pengutronix.de * * Based on code from Freescale, * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ #include #include #include #include #include #include #include #include #include #define MXS_SET 0x4 #define MXS_CLR 0x8 #define PINCTRL_DOUT(n) ((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10) #define PINCTRL_DIN(n) ((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10) #define PINCTRL_DOE(n) ((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10) #define PINCTRL_PIN2IRQ(n) ((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10) #define PINCTRL_IRQEN(n) ((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10) #define PINCTRL_IRQLEV(n) ((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10) #define PINCTRL_IRQPOL(n) ((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10) #define PINCTRL_IRQSTAT(n) ((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10) #define GPIO_INT_FALL_EDGE 0x0 #define GPIO_INT_LOW_LEV 0x1 #define GPIO_INT_RISE_EDGE 0x2 #define GPIO_INT_HIGH_LEV 0x3 #define GPIO_INT_LEV_MASK (1 << 0) #define GPIO_INT_POL_MASK (1 << 1) struct mxs_gpio_port { void __iomem *base; int id; int irq; int virtual_irq_start; struct bgpio_chip bgc; }; /* Note: This driver assumes 32 GPIOs are handled in one register */ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type) { u32 gpio = irq_to_gpio(d->irq); u32 pin_mask = 1 << (gpio & 31); struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct mxs_gpio_port *port = gc->private; void __iomem *pin_addr; int edge; switch (type) { case IRQ_TYPE_EDGE_RISING: edge = GPIO_INT_RISE_EDGE; break; case IRQ_TYPE_EDGE_FALLING: edge = GPIO_INT_FALL_EDGE; break; case IRQ_TYPE_LEVEL_LOW: edge = GPIO_INT_LOW_LEV; break; case IRQ_TYPE_LEVEL_HIGH: edge = GPIO_INT_HIGH_LEV; break; default: return -EINVAL; } /* set level or edge */ pin_addr = port->base + PINCTRL_IRQLEV(port->id); if (edge & GPIO_INT_LEV_MASK) writel(pin_mask, pin_addr + MXS_SET); else writel(pin_mask, pin_addr + MXS_CLR); /* set polarity */ pin_addr = port->base + PINCTRL_IRQPOL(port->id); if (edge & GPIO_INT_POL_MASK) writel(pin_mask, pin_addr + MXS_SET); else writel(pin_mask, pin_addr + MXS_CLR); writel(1 << (gpio & 0x1f), port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR); return 0; } /* MXS has one interrupt *per* gpio port */ static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc) { u32 irq_stat; struct mxs_gpio_port *port = irq_get_handler_data(irq); u32 gpio_irq_no_base = port->virtual_irq_start; desc->irq_data.chip->irq_ack(&desc->irq_data); irq_stat = readl(port->base + PINCTRL_IRQSTAT(port->id)) & readl(port->base + PINCTRL_IRQEN(port->id)); while (irq_stat != 0) { int irqoffset = fls(irq_stat) - 1; generic_handle_irq(gpio_irq_no_base + irqoffset); irq_stat &= ~(1 << irqoffset); } } /* * Set interrupt number "irq" in the GPIO as a wake-up source. * While system is running, all registered GPIO interrupts need to have * wake-up enabled. When system is suspended, only selected GPIO interrupts * need to have wake-up enabled. * @param irq interrupt source number * @param enable enable as wake-up if equal to non-zero * @return This function returns 0 on success. */ static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable) { struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct mxs_gpio_port *port = gc->private; if (enable) enable_irq_wake(port->irq); else disable_irq_wake(port->irq); return 0; } static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start, port->base, handle_level_irq); gc->private = port; ct = gc->chip_types; ct->chip.irq_ack = irq_gc_ack_set_bit; ct->chip.irq_mask = irq_gc_mask_clr_bit; ct->chip.irq_unmask = irq_gc_mask_set_bit; ct->chip.irq_set_type = mxs_gpio_set_irq_type; ct->chip.irq_set_wake = mxs_gpio_set_wake_irq; ct->regs.ack = PINCTRL_IRQSTAT(port->id) + MXS_CLR; ct->regs.mask = PINCTRL_IRQEN(port->id); irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); } static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { struct bgpio_chip *bgc = to_bgpio_chip(gc); struct mxs_gpio_port *port = container_of(bgc, struct mxs_gpio_port, bgc); return port->virtual_irq_start + offset; } static int __devinit mxs_gpio_probe(struct platform_device *pdev) { static void __iomem *base; struct mxs_gpio_port *port; struct resource *iores = NULL; int err; port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL); if (!port) return -ENOMEM; port->id = pdev->id; port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32; /* * map memory region only once, as all the gpio ports * share the same one */ if (!base) { iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!iores) { err = -ENODEV; goto out_kfree; } if (!request_mem_region(iores->start, resource_size(iores), pdev->name)) { err = -EBUSY; goto out_kfree; } base = ioremap(iores->start, resource_size(iores)); if (!base) { err = -ENOMEM; goto out_release_mem; } } port->base = base; port->irq = platform_get_irq(pdev, 0); if (port->irq < 0) { err = -EINVAL; goto out_iounmap; } /* * select the pin interrupt functionality but initially * disable the interrupts */ writel(~0U, port->base + PINCTRL_PIN2IRQ(port->id)); writel(0, port->base + PINCTRL_IRQEN(port->id)); /* clear address has to be used to clear IRQSTAT bits */ writel(~0U, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR); /* gpio-mxs can be a generic irq chip */ mxs_gpio_init_gc(port); /* setup one handler for each entry */ irq_set_chained_handler(port->irq, mxs_gpio_irq_handler); irq_set_handler_data(port->irq, port); err = bgpio_init(&port->bgc, &pdev->dev, 4, port->base + PINCTRL_DIN(port->id), port->base + PINCTRL_DOUT(port->id), NULL, port->base + PINCTRL_DOE(port->id), NULL, false); if (err) goto out_iounmap; port->bgc.gc.to_irq = mxs_gpio_to_irq; port->bgc.gc.base = port->id * 32; err = gpiochip_add(&port->bgc.gc); if (err) goto out_bgpio_remove; return 0; out_bgpio_remove: bgpio_remove(&port->bgc); out_iounmap: if (iores) iounmap(port->base); out_release_mem: if (iores) release_mem_region(iores->start, resource_size(iores)); out_kfree: kfree(port); dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); return err; } static struct platform_driver mxs_gpio_driver = { .driver = { .name = "gpio-mxs", .owner = THIS_MODULE, }, .probe = mxs_gpio_probe, }; static int __init mxs_gpio_init(void) { return platform_driver_register(&mxs_gpio_driver); } postcore_initcall(mxs_gpio_init); MODULE_AUTHOR("Freescale Semiconductor, " "Daniel Mack , " "Juergen Beisert "); MODULE_DESCRIPTION("Freescale MXS GPIO"); MODULE_LICENSE("GPL");