/* * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> * 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 <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/gpio.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/basic_mmio_gpio.h> #include <linux/of.h> #include <linux/of_device.h> #include <asm-generic/bug.h> enum mxc_gpio_hwtype { IMX1_GPIO, /* runs on i.mx1 */ IMX21_GPIO, /* runs on i.mx21 and i.mx27 */ IMX31_GPIO, /* runs on all other i.mx */ }; /* device type dependent stuff */ struct mxc_gpio_hwdata { unsigned dr_reg; unsigned gdir_reg; unsigned psr_reg; unsigned icr1_reg; unsigned icr2_reg; unsigned imr_reg; unsigned isr_reg; unsigned low_level; unsigned high_level; unsigned rise_edge; unsigned fall_edge; }; struct mxc_gpio_port { struct list_head node; void __iomem *base; int irq; int irq_high; int virtual_irq_start; struct bgpio_chip bgc; u32 both_edges; }; static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = { .dr_reg = 0x1c, .gdir_reg = 0x00, .psr_reg = 0x24, .icr1_reg = 0x28, .icr2_reg = 0x2c, .imr_reg = 0x30, .isr_reg = 0x34, .low_level = 0x03, .high_level = 0x02, .rise_edge = 0x00, .fall_edge = 0x01, }; static struct mxc_gpio_hwdata imx31_gpio_hwdata = { .dr_reg = 0x00, .gdir_reg = 0x04, .psr_reg = 0x08, .icr1_reg = 0x0c, .icr2_reg = 0x10, .imr_reg = 0x14, .isr_reg = 0x18, .low_level = 0x00, .high_level = 0x01, .rise_edge = 0x02, .fall_edge = 0x03, }; static enum mxc_gpio_hwtype mxc_gpio_hwtype; static struct mxc_gpio_hwdata *mxc_gpio_hwdata; #define GPIO_DR (mxc_gpio_hwdata->dr_reg) #define GPIO_GDIR (mxc_gpio_hwdata->gdir_reg) #define GPIO_PSR (mxc_gpio_hwdata->psr_reg) #define GPIO_ICR1 (mxc_gpio_hwdata->icr1_reg) #define GPIO_ICR2 (mxc_gpio_hwdata->icr2_reg) #define GPIO_IMR (mxc_gpio_hwdata->imr_reg) #define GPIO_ISR (mxc_gpio_hwdata->isr_reg) #define GPIO_INT_LOW_LEV (mxc_gpio_hwdata->low_level) #define GPIO_INT_HIGH_LEV (mxc_gpio_hwdata->high_level) #define GPIO_INT_RISE_EDGE (mxc_gpio_hwdata->rise_edge) #define GPIO_INT_FALL_EDGE (mxc_gpio_hwdata->fall_edge) #define GPIO_INT_NONE 0x4 static struct platform_device_id mxc_gpio_devtype[] = { { .name = "imx1-gpio", .driver_data = IMX1_GPIO, }, { .name = "imx21-gpio", .driver_data = IMX21_GPIO, }, { .name = "imx31-gpio", .driver_data = IMX31_GPIO, }, { /* sentinel */ } }; static const struct of_device_id mxc_gpio_dt_ids[] = { { .compatible = "fsl,imx1-gpio", .data = &mxc_gpio_devtype[IMX1_GPIO], }, { .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], }, { .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], }, { /* sentinel */ } }; /* * MX2 has one interrupt *for all* gpio ports. The list is used * to save the references to all ports, so that mx2_gpio_irq_handler * can walk through all interrupt status registers. */ static LIST_HEAD(mxc_gpio_ports); /* Note: This driver assumes 32 GPIOs are handled in one register */ static int gpio_set_irq_type(struct irq_data *d, u32 type) { u32 gpio = irq_to_gpio(d->irq); struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct mxc_gpio_port *port = gc->private; u32 bit, val; int edge; void __iomem *reg = port->base; port->both_edges &= ~(1 << (gpio & 31)); 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_EDGE_BOTH: val = gpio_get_value(gpio); if (val) { edge = GPIO_INT_LOW_LEV; pr_debug("mxc: set GPIO %d to low trigger\n", gpio); } else { edge = GPIO_INT_HIGH_LEV; pr_debug("mxc: set GPIO %d to high trigger\n", gpio); } port->both_edges |= 1 << (gpio & 31); 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; } reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ bit = gpio & 0xf; val = readl(reg) & ~(0x3 << (bit << 1)); writel(val | (edge << (bit << 1)), reg); writel(1 << (gpio & 0x1f), port->base + GPIO_ISR); return 0; } static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) { void __iomem *reg = port->base; u32 bit, val; int edge; reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ bit = gpio & 0xf; val = readl(reg); edge = (val >> (bit << 1)) & 3; val &= ~(0x3 << (bit << 1)); if (edge == GPIO_INT_HIGH_LEV) { edge = GPIO_INT_LOW_LEV; pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); } else if (edge == GPIO_INT_LOW_LEV) { edge = GPIO_INT_HIGH_LEV; pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); } else { pr_err("mxc: invalid configuration for GPIO %d: %x\n", gpio, edge); return; } writel(val | (edge << (bit << 1)), reg); } /* handle 32 interrupts in one status register */ static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) { u32 gpio_irq_no_base = port->virtual_irq_start; while (irq_stat != 0) { int irqoffset = fls(irq_stat) - 1; if (port->both_edges & (1 << irqoffset)) mxc_flip_edge(port, irqoffset); generic_handle_irq(gpio_irq_no_base + irqoffset); irq_stat &= ~(1 << irqoffset); } } /* MX1 and MX3 has one interrupt *per* gpio port */ static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc) { u32 irq_stat; struct mxc_gpio_port *port = irq_get_handler_data(irq); irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR); mxc_gpio_irq_handler(port, irq_stat); } /* MX2 has one interrupt *for all* gpio ports */ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc) { u32 irq_msk, irq_stat; struct mxc_gpio_port *port; /* walk through all interrupt status registers */ list_for_each_entry(port, &mxc_gpio_ports, node) { irq_msk = readl(port->base + GPIO_IMR); if (!irq_msk) continue; irq_stat = readl(port->base + GPIO_ISR) & irq_msk; if (irq_stat) mxc_gpio_irq_handler(port, irq_stat); } } /* * 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 gpio_set_wake_irq(struct irq_data *d, u32 enable) { u32 gpio = irq_to_gpio(d->irq); u32 gpio_idx = gpio & 0x1F; struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct mxc_gpio_port *port = gc->private; if (enable) { if (port->irq_high && (gpio_idx >= 16)) enable_irq_wake(port->irq_high); else enable_irq_wake(port->irq); } else { if (port->irq_high && (gpio_idx >= 16)) disable_irq_wake(port->irq_high); else disable_irq_wake(port->irq); } return 0; } static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_alloc_generic_chip("gpio-mxc", 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 = gpio_set_irq_type; ct->chip.irq_set_wake = gpio_set_wake_irq; ct->regs.ack = GPIO_ISR; ct->regs.mask = GPIO_IMR; irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK, IRQ_NOREQUEST, 0); } static void __devinit mxc_gpio_get_hw(struct platform_device *pdev) { const struct of_device_id *of_id = of_match_device(mxc_gpio_dt_ids, &pdev->dev); enum mxc_gpio_hwtype hwtype; if (of_id) pdev->id_entry = of_id->data; hwtype = pdev->id_entry->driver_data; if (mxc_gpio_hwtype) { /* * The driver works with a reasonable presupposition, * that is all gpio ports must be the same type when * running on one soc. */ BUG_ON(mxc_gpio_hwtype != hwtype); return; } if (hwtype == IMX31_GPIO) mxc_gpio_hwdata = &imx31_gpio_hwdata; else mxc_gpio_hwdata = &imx1_imx21_gpio_hwdata; mxc_gpio_hwtype = hwtype; } static int __devinit mxc_gpio_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct mxc_gpio_port *port; struct resource *iores; int err; mxc_gpio_get_hw(pdev); port = kzalloc(sizeof(struct mxc_gpio_port), GFP_KERNEL); if (!port) return -ENOMEM; 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; } port->base = ioremap(iores->start, resource_size(iores)); if (!port->base) { err = -ENOMEM; goto out_release_mem; } port->irq_high = platform_get_irq(pdev, 1); port->irq = platform_get_irq(pdev, 0); if (port->irq < 0) { err = -EINVAL; goto out_iounmap; } /* disable the interrupt and clear the status */ writel(0, port->base + GPIO_IMR); writel(~0, port->base + GPIO_ISR); if (mxc_gpio_hwtype == IMX21_GPIO) { /* setup one handler for all GPIO interrupts */ if (pdev->id == 0) irq_set_chained_handler(port->irq, mx2_gpio_irq_handler); } else { /* setup one handler for each entry */ irq_set_chained_handler(port->irq, mx3_gpio_irq_handler); irq_set_handler_data(port->irq, port); if (port->irq_high > 0) { /* setup handler for GPIO 16 to 31 */ irq_set_chained_handler(port->irq_high, mx3_gpio_irq_handler); irq_set_handler_data(port->irq_high, port); } } err = bgpio_init(&port->bgc, &pdev->dev, 4, port->base + GPIO_PSR, port->base + GPIO_DR, NULL, port->base + GPIO_GDIR, NULL, false); if (err) goto out_iounmap; port->bgc.gc.base = pdev->id * 32; port->bgc.dir = port->bgc.read_reg(port->bgc.reg_dir); port->bgc.data = port->bgc.read_reg(port->bgc.reg_set); err = gpiochip_add(&port->bgc.gc); if (err) goto out_bgpio_remove; /* * In dt case, we use gpio number range dynamically * allocated by gpio core. */ port->virtual_irq_start = MXC_GPIO_IRQ_START + (np ? port->bgc.gc.base : pdev->id * 32); /* gpio-mxc can be a generic irq chip */ mxc_gpio_init_gc(port); list_add_tail(&port->node, &mxc_gpio_ports); return 0; out_bgpio_remove: bgpio_remove(&port->bgc); out_iounmap: iounmap(port->base); out_release_mem: 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 mxc_gpio_driver = { .driver = { .name = "gpio-mxc", .owner = THIS_MODULE, .of_match_table = mxc_gpio_dt_ids, }, .probe = mxc_gpio_probe, .id_table = mxc_gpio_devtype, }; static int __init gpio_mxc_init(void) { return platform_driver_register(&mxc_gpio_driver); } postcore_initcall(gpio_mxc_init); MODULE_AUTHOR("Freescale Semiconductor, " "Daniel Mack <danielncaiaq.de>, " "Juergen Beisert <kernel@pengutronix.de>"); MODULE_DESCRIPTION("Freescale MXC GPIO"); MODULE_LICENSE("GPL");