X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fgpio%2Fgpio-bt8xx.c;fp=kernel%2Fdrivers%2Fgpio%2Fgpio-bt8xx.c;h=7e4c43c189600cc042248f21e8796c86acf79755;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/gpio/gpio-bt8xx.c b/kernel/drivers/gpio/gpio-bt8xx.c new file mode 100644 index 000000000..7e4c43c18 --- /dev/null +++ b/kernel/drivers/gpio/gpio-bt8xx.c @@ -0,0 +1,323 @@ +/* + + bt8xx GPIO abuser + + Copyright (C) 2008 Michael Buesch + + Please do _only_ contact the people listed _above_ with issues related to this driver. + All the other people listed below are not related to this driver. Their names + are only here, because this driver is derived from the bt848 driver. + + + Derived from the bt848 driver: + + Copyright (C) 1996,97,98 Ralph Metzler + & Marcus Metzler + (c) 1999-2002 Gerd Knorr + + some v4l2 code lines are taken from Justin's bttv2 driver which is + (c) 2000 Justin Schoeman + + V4L1 removal from: + (c) 2005-2006 Nickolay V. Shmyrev + + Fixes to be fully V4L2 compliant by + (c) 2006 Mauro Carvalho Chehab + + Cropping and overscan support + Copyright (C) 2005, 2006 Michael H. Schimek + Sponsored by OPQ Systems AB + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include +#include +#include +#include +#include + +/* Steal the hardware definitions from the bttv driver. */ +#include "../media/pci/bt8xx/bt848.h" + + +#define BT8XXGPIO_NR_GPIOS 24 /* We have 24 GPIO pins */ + + +struct bt8xxgpio { + spinlock_t lock; + + void __iomem *mmio; + struct pci_dev *pdev; + struct gpio_chip gpio; + +#ifdef CONFIG_PM + u32 saved_outen; + u32 saved_data; +#endif +}; + +#define bgwrite(dat, adr) writel((dat), bg->mmio+(adr)) +#define bgread(adr) readl(bg->mmio+(adr)) + + +static int modparam_gpiobase = -1/* dynamic */; +module_param_named(gpiobase, modparam_gpiobase, int, 0444); +MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default."); + + +static int bt8xxgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) +{ + struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); + unsigned long flags; + u32 outen, data; + + spin_lock_irqsave(&bg->lock, flags); + + data = bgread(BT848_GPIO_DATA); + data &= ~(1 << nr); + bgwrite(data, BT848_GPIO_DATA); + + outen = bgread(BT848_GPIO_OUT_EN); + outen &= ~(1 << nr); + bgwrite(outen, BT848_GPIO_OUT_EN); + + spin_unlock_irqrestore(&bg->lock, flags); + + return 0; +} + +static int bt8xxgpio_gpio_get(struct gpio_chip *gpio, unsigned nr) +{ + struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); + unsigned long flags; + u32 val; + + spin_lock_irqsave(&bg->lock, flags); + val = bgread(BT848_GPIO_DATA); + spin_unlock_irqrestore(&bg->lock, flags); + + return !!(val & (1 << nr)); +} + +static int bt8xxgpio_gpio_direction_output(struct gpio_chip *gpio, + unsigned nr, int val) +{ + struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); + unsigned long flags; + u32 outen, data; + + spin_lock_irqsave(&bg->lock, flags); + + outen = bgread(BT848_GPIO_OUT_EN); + outen |= (1 << nr); + bgwrite(outen, BT848_GPIO_OUT_EN); + + data = bgread(BT848_GPIO_DATA); + if (val) + data |= (1 << nr); + else + data &= ~(1 << nr); + bgwrite(data, BT848_GPIO_DATA); + + spin_unlock_irqrestore(&bg->lock, flags); + + return 0; +} + +static void bt8xxgpio_gpio_set(struct gpio_chip *gpio, + unsigned nr, int val) +{ + struct bt8xxgpio *bg = container_of(gpio, struct bt8xxgpio, gpio); + unsigned long flags; + u32 data; + + spin_lock_irqsave(&bg->lock, flags); + + data = bgread(BT848_GPIO_DATA); + if (val) + data |= (1 << nr); + else + data &= ~(1 << nr); + bgwrite(data, BT848_GPIO_DATA); + + spin_unlock_irqrestore(&bg->lock, flags); +} + +static void bt8xxgpio_gpio_setup(struct bt8xxgpio *bg) +{ + struct gpio_chip *c = &bg->gpio; + + c->label = dev_name(&bg->pdev->dev); + c->owner = THIS_MODULE; + c->direction_input = bt8xxgpio_gpio_direction_input; + c->get = bt8xxgpio_gpio_get; + c->direction_output = bt8xxgpio_gpio_direction_output; + c->set = bt8xxgpio_gpio_set; + c->dbg_show = NULL; + c->base = modparam_gpiobase; + c->ngpio = BT8XXGPIO_NR_GPIOS; + c->can_sleep = false; +} + +static int bt8xxgpio_probe(struct pci_dev *dev, + const struct pci_device_id *pci_id) +{ + struct bt8xxgpio *bg; + int err; + + bg = devm_kzalloc(&dev->dev, sizeof(struct bt8xxgpio), GFP_KERNEL); + if (!bg) + return -ENOMEM; + + bg->pdev = dev; + spin_lock_init(&bg->lock); + + err = pci_enable_device(dev); + if (err) { + printk(KERN_ERR "bt8xxgpio: Can't enable device.\n"); + return err; + } + if (!devm_request_mem_region(&dev->dev, pci_resource_start(dev, 0), + pci_resource_len(dev, 0), + "bt8xxgpio")) { + printk(KERN_WARNING "bt8xxgpio: Can't request iomem (0x%llx).\n", + (unsigned long long)pci_resource_start(dev, 0)); + err = -EBUSY; + goto err_disable; + } + pci_set_master(dev); + pci_set_drvdata(dev, bg); + + bg->mmio = devm_ioremap(&dev->dev, pci_resource_start(dev, 0), 0x1000); + if (!bg->mmio) { + printk(KERN_ERR "bt8xxgpio: ioremap() failed\n"); + err = -EIO; + goto err_disable; + } + + /* Disable interrupts */ + bgwrite(0, BT848_INT_MASK); + + /* gpio init */ + bgwrite(0, BT848_GPIO_DMA_CTL); + bgwrite(0, BT848_GPIO_REG_INP); + bgwrite(0, BT848_GPIO_OUT_EN); + + bt8xxgpio_gpio_setup(bg); + err = gpiochip_add(&bg->gpio); + if (err) { + printk(KERN_ERR "bt8xxgpio: Failed to register GPIOs\n"); + goto err_disable; + } + + return 0; + +err_disable: + pci_disable_device(dev); + + return err; +} + +static void bt8xxgpio_remove(struct pci_dev *pdev) +{ + struct bt8xxgpio *bg = pci_get_drvdata(pdev); + + gpiochip_remove(&bg->gpio); + + bgwrite(0, BT848_INT_MASK); + bgwrite(~0x0, BT848_INT_STAT); + bgwrite(0x0, BT848_GPIO_OUT_EN); + + pci_disable_device(pdev); +} + +#ifdef CONFIG_PM +static int bt8xxgpio_suspend(struct pci_dev *pdev, pm_message_t state) +{ + struct bt8xxgpio *bg = pci_get_drvdata(pdev); + unsigned long flags; + + spin_lock_irqsave(&bg->lock, flags); + + bg->saved_outen = bgread(BT848_GPIO_OUT_EN); + bg->saved_data = bgread(BT848_GPIO_DATA); + + bgwrite(0, BT848_INT_MASK); + bgwrite(~0x0, BT848_INT_STAT); + bgwrite(0x0, BT848_GPIO_OUT_EN); + + spin_unlock_irqrestore(&bg->lock, flags); + + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + + return 0; +} + +static int bt8xxgpio_resume(struct pci_dev *pdev) +{ + struct bt8xxgpio *bg = pci_get_drvdata(pdev); + unsigned long flags; + int err; + + pci_set_power_state(pdev, PCI_D0); + err = pci_enable_device(pdev); + if (err) + return err; + pci_restore_state(pdev); + + spin_lock_irqsave(&bg->lock, flags); + + bgwrite(0, BT848_INT_MASK); + bgwrite(0, BT848_GPIO_DMA_CTL); + bgwrite(0, BT848_GPIO_REG_INP); + bgwrite(bg->saved_outen, BT848_GPIO_OUT_EN); + bgwrite(bg->saved_data & bg->saved_outen, + BT848_GPIO_DATA); + + spin_unlock_irqrestore(&bg->lock, flags); + + return 0; +} +#else +#define bt8xxgpio_suspend NULL +#define bt8xxgpio_resume NULL +#endif /* CONFIG_PM */ + +static const struct pci_device_id bt8xxgpio_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) }, + { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT849) }, + { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT878) }, + { PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT879) }, + { 0, }, +}; +MODULE_DEVICE_TABLE(pci, bt8xxgpio_pci_tbl); + +static struct pci_driver bt8xxgpio_pci_driver = { + .name = "bt8xxgpio", + .id_table = bt8xxgpio_pci_tbl, + .probe = bt8xxgpio_probe, + .remove = bt8xxgpio_remove, + .suspend = bt8xxgpio_suspend, + .resume = bt8xxgpio_resume, +}; + +module_pci_driver(bt8xxgpio_pci_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Buesch"); +MODULE_DESCRIPTION("Abuse a BT8xx framegrabber card as generic GPIO card");