From c103de240439dfee24ac50eb99c8be3a30d13323 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Sat, 4 Jun 2011 18:38:28 -0600 Subject: gpio: reorganize drivers Sort the gpio makefile and enforce the naming convention gpio-*.c for gpio drivers. v2: cleaned up filenames in Kconfig and comment blocks v3: fixup use of BASIC_MMIO to GENERIC_GPIO for mxc Signed-off-by: Grant Likely --- drivers/gpio/vx855_gpio.c | 333 ---------------------------------------------- 1 file changed, 333 deletions(-) delete mode 100644 drivers/gpio/vx855_gpio.c (limited to 'drivers/gpio/vx855_gpio.c') diff --git a/drivers/gpio/vx855_gpio.c b/drivers/gpio/vx855_gpio.c deleted file mode 100644 index ef5aabd8b8b7..000000000000 --- a/drivers/gpio/vx855_gpio.c +++ /dev/null @@ -1,333 +0,0 @@ -/* - * Linux GPIOlib driver for the VIA VX855 integrated southbridge GPIO - * - * Copyright (C) 2009 VIA Technologies, Inc. - * Copyright (C) 2010 One Laptop per Child - * Author: Harald Welte - * 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., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#define MODULE_NAME "vx855_gpio" - -/* The VX855 south bridge has the following GPIO pins: - * GPI 0...13 General Purpose Input - * GPO 0...12 General Purpose Output - * GPIO 0...14 General Purpose I/O (Open-Drain) - */ - -#define NR_VX855_GPI 14 -#define NR_VX855_GPO 13 -#define NR_VX855_GPIO 15 - -#define NR_VX855_GPInO (NR_VX855_GPI + NR_VX855_GPO) -#define NR_VX855_GP (NR_VX855_GPI + NR_VX855_GPO + NR_VX855_GPIO) - -struct vx855_gpio { - struct gpio_chip gpio; - spinlock_t lock; - u32 io_gpi; - u32 io_gpo; - bool gpi_reserved; - bool gpo_reserved; -}; - -/* resolve a GPIx into the corresponding bit position */ -static inline u_int32_t gpi_i_bit(int i) -{ - if (i < 10) - return 1 << i; - else - return 1 << (i + 14); -} - -static inline u_int32_t gpo_o_bit(int i) -{ - if (i < 11) - return 1 << i; - else - return 1 << (i + 14); -} - -static inline u_int32_t gpio_i_bit(int i) -{ - if (i < 14) - return 1 << (i + 10); - else - return 1 << (i + 14); -} - -static inline u_int32_t gpio_o_bit(int i) -{ - if (i < 14) - return 1 << (i + 11); - else - return 1 << (i + 13); -} - -/* Mapping betwee numeric GPIO ID and the actual GPIO hardware numbering: - * 0..13 GPI 0..13 - * 14..26 GPO 0..12 - * 27..41 GPIO 0..14 - */ - -static int vx855gpio_direction_input(struct gpio_chip *gpio, - unsigned int nr) -{ - struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio); - unsigned long flags; - u_int32_t reg_out; - - /* Real GPI bits are always in input direction */ - if (nr < NR_VX855_GPI) - return 0; - - /* Real GPO bits cannot be put in output direction */ - if (nr < NR_VX855_GPInO) - return -EINVAL; - - /* Open Drain GPIO have to be set to one */ - spin_lock_irqsave(&vg->lock, flags); - reg_out = inl(vg->io_gpo); - reg_out |= gpio_o_bit(nr - NR_VX855_GPInO); - outl(reg_out, vg->io_gpo); - spin_unlock_irqrestore(&vg->lock, flags); - - return 0; -} - -static int vx855gpio_get(struct gpio_chip *gpio, unsigned int nr) -{ - struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio); - u_int32_t reg_in; - int ret = 0; - - if (nr < NR_VX855_GPI) { - reg_in = inl(vg->io_gpi); - if (reg_in & gpi_i_bit(nr)) - ret = 1; - } else if (nr < NR_VX855_GPInO) { - /* GPO don't have an input bit, we need to read it - * back from the output register */ - reg_in = inl(vg->io_gpo); - if (reg_in & gpo_o_bit(nr - NR_VX855_GPI)) - ret = 1; - } else { - reg_in = inl(vg->io_gpi); - if (reg_in & gpio_i_bit(nr - NR_VX855_GPInO)) - ret = 1; - } - - return ret; -} - -static void vx855gpio_set(struct gpio_chip *gpio, unsigned int nr, - int val) -{ - struct vx855_gpio *vg = container_of(gpio, struct vx855_gpio, gpio); - unsigned long flags; - u_int32_t reg_out; - - /* True GPI cannot be switched to output mode */ - if (nr < NR_VX855_GPI) - return; - - spin_lock_irqsave(&vg->lock, flags); - reg_out = inl(vg->io_gpo); - if (nr < NR_VX855_GPInO) { - if (val) - reg_out |= gpo_o_bit(nr - NR_VX855_GPI); - else - reg_out &= ~gpo_o_bit(nr - NR_VX855_GPI); - } else { - if (val) - reg_out |= gpio_o_bit(nr - NR_VX855_GPInO); - else - reg_out &= ~gpio_o_bit(nr - NR_VX855_GPInO); - } - outl(reg_out, vg->io_gpo); - spin_unlock_irqrestore(&vg->lock, flags); -} - -static int vx855gpio_direction_output(struct gpio_chip *gpio, - unsigned int nr, int val) -{ - /* True GPI cannot be switched to output mode */ - if (nr < NR_VX855_GPI) - return -EINVAL; - - /* True GPO don't need to be switched to output mode, - * and GPIO are open-drain, i.e. also need no switching, - * so all we do is set the level */ - vx855gpio_set(gpio, nr, val); - - return 0; -} - -static const char *vx855gpio_names[NR_VX855_GP] = { - "VX855_GPI0", "VX855_GPI1", "VX855_GPI2", "VX855_GPI3", "VX855_GPI4", - "VX855_GPI5", "VX855_GPI6", "VX855_GPI7", "VX855_GPI8", "VX855_GPI9", - "VX855_GPI10", "VX855_GPI11", "VX855_GPI12", "VX855_GPI13", - "VX855_GPO0", "VX855_GPO1", "VX855_GPO2", "VX855_GPO3", "VX855_GPO4", - "VX855_GPO5", "VX855_GPO6", "VX855_GPO7", "VX855_GPO8", "VX855_GPO9", - "VX855_GPO10", "VX855_GPO11", "VX855_GPO12", - "VX855_GPIO0", "VX855_GPIO1", "VX855_GPIO2", "VX855_GPIO3", - "VX855_GPIO4", "VX855_GPIO5", "VX855_GPIO6", "VX855_GPIO7", - "VX855_GPIO8", "VX855_GPIO9", "VX855_GPIO10", "VX855_GPIO11", - "VX855_GPIO12", "VX855_GPIO13", "VX855_GPIO14" -}; - -static void vx855gpio_gpio_setup(struct vx855_gpio *vg) -{ - struct gpio_chip *c = &vg->gpio; - - c->label = "VX855 South Bridge"; - c->owner = THIS_MODULE; - c->direction_input = vx855gpio_direction_input; - c->direction_output = vx855gpio_direction_output; - c->get = vx855gpio_get; - c->set = vx855gpio_set; - c->dbg_show = NULL; - c->base = 0; - c->ngpio = NR_VX855_GP; - c->can_sleep = 0; - c->names = vx855gpio_names; -} - -/* This platform device is ordinarily registered by the vx855 mfd driver */ -static __devinit int vx855gpio_probe(struct platform_device *pdev) -{ - struct resource *res_gpi; - struct resource *res_gpo; - struct vx855_gpio *vg; - int ret; - - res_gpi = platform_get_resource(pdev, IORESOURCE_IO, 0); - res_gpo = platform_get_resource(pdev, IORESOURCE_IO, 1); - if (!res_gpi || !res_gpo) - return -EBUSY; - - vg = kzalloc(sizeof(*vg), GFP_KERNEL); - if (!vg) - return -ENOMEM; - - platform_set_drvdata(pdev, vg); - - dev_info(&pdev->dev, "found VX855 GPIO controller\n"); - vg->io_gpi = res_gpi->start; - vg->io_gpo = res_gpo->start; - spin_lock_init(&vg->lock); - - /* - * A single byte is used to control various GPIO ports on the VX855, - * and in the case of the OLPC XO-1.5, some of those ports are used - * for switches that are interpreted and exposed through ACPI. ACPI - * will have reserved the region, so our own reservation will not - * succeed. Ignore and continue. - */ - - if (!request_region(res_gpi->start, resource_size(res_gpi), - MODULE_NAME "_gpi")) - dev_warn(&pdev->dev, - "GPI I/O resource busy, probably claimed by ACPI\n"); - else - vg->gpi_reserved = true; - - if (!request_region(res_gpo->start, resource_size(res_gpo), - MODULE_NAME "_gpo")) - dev_warn(&pdev->dev, - "GPO I/O resource busy, probably claimed by ACPI\n"); - else - vg->gpo_reserved = true; - - vx855gpio_gpio_setup(vg); - - ret = gpiochip_add(&vg->gpio); - if (ret) { - dev_err(&pdev->dev, "failed to register GPIOs\n"); - goto out_release; - } - - return 0; - -out_release: - if (vg->gpi_reserved) - release_region(res_gpi->start, resource_size(res_gpi)); - if (vg->gpo_reserved) - release_region(res_gpi->start, resource_size(res_gpo)); - platform_set_drvdata(pdev, NULL); - kfree(vg); - return ret; -} - -static int __devexit vx855gpio_remove(struct platform_device *pdev) -{ - struct vx855_gpio *vg = platform_get_drvdata(pdev); - struct resource *res; - - if (gpiochip_remove(&vg->gpio)) - dev_err(&pdev->dev, "unable to remove gpio_chip?\n"); - - if (vg->gpi_reserved) { - res = platform_get_resource(pdev, IORESOURCE_IO, 0); - release_region(res->start, resource_size(res)); - } - if (vg->gpo_reserved) { - res = platform_get_resource(pdev, IORESOURCE_IO, 1); - release_region(res->start, resource_size(res)); - } - - platform_set_drvdata(pdev, NULL); - kfree(vg); - return 0; -} - -static struct platform_driver vx855gpio_driver = { - .driver = { - .name = MODULE_NAME, - .owner = THIS_MODULE, - }, - .probe = vx855gpio_probe, - .remove = __devexit_p(vx855gpio_remove), -}; - -static int vx855gpio_init(void) -{ - return platform_driver_register(&vx855gpio_driver); -} -module_init(vx855gpio_init); - -static void vx855gpio_exit(void) -{ - platform_driver_unregister(&vx855gpio_driver); -} -module_exit(vx855gpio_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Harald Welte "); -MODULE_DESCRIPTION("GPIO driver for the VIA VX855 chipset"); -MODULE_ALIAS("platform:vx855_gpio"); -- cgit v1.2.3-59-g8ed1b