// SPDX-License-Identifier: GPL-2.0-only /* * Support code for the SCOOP interface found on various Sharp PDAs * * Copyright (c) 2004 Richard Purdie * * Based on code written by Sharp/Lineo for 2.4 kernels */ #include #include #include #include #include #include #include #include /* PCMCIA to Scoop linkage There is no easy way to link multiple scoop devices into one single entity for the pxa2xx_pcmcia device so this structure is used which is setup by the platform code. This file is never modular so this symbol is always accessile to the board support files. */ struct scoop_pcmcia_config *platform_scoop_config; EXPORT_SYMBOL(platform_scoop_config); struct scoop_dev { void __iomem *base; struct gpio_chip gpio; spinlock_t scoop_lock; unsigned short suspend_clr; unsigned short suspend_set; u32 scoop_gpwr; }; void reset_scoop(struct device *dev) { struct scoop_dev *sdev = dev_get_drvdata(dev); iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */ iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */ iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */ iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */ iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */ iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */ iowrite16(0x0000, sdev->base + SCOOP_IRM); } static void __scoop_gpio_set(struct scoop_dev *sdev, unsigned offset, int value) { unsigned short gpwr; gpwr = ioread16(sdev->base + SCOOP_GPWR); if (value) gpwr |= 1 << (offset + 1); else gpwr &= ~(1 << (offset + 1)); iowrite16(gpwr, sdev->base + SCOOP_GPWR); } static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct scoop_dev *sdev = gpiochip_get_data(chip); unsigned long flags; spin_lock_irqsave(&sdev->scoop_lock, flags); __scoop_gpio_set(sdev, offset, value); spin_unlock_irqrestore(&sdev->scoop_lock, flags); } static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset) { struct scoop_dev *sdev = gpiochip_get_data(chip); /* XXX: I'm unsure, but it seems so */ return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1))); } static int scoop_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { struct scoop_dev *sdev = gpiochip_get_data(chip); unsigned long flags; unsigned short gpcr; spin_lock_irqsave(&sdev->scoop_lock, flags); gpcr = ioread16(sdev->base + SCOOP_GPCR); gpcr &= ~(1 << (offset + 1)); iowrite16(gpcr, sdev->base + SCOOP_GPCR); spin_unlock_irqrestore(&sdev->scoop_lock, flags); return 0; } static int scoop_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { struct scoop_dev *sdev = gpiochip_get_data(chip); unsigned long flags; unsigned short gpcr; spin_lock_irqsave(&sdev->scoop_lock, flags); __scoop_gpio_set(sdev, offset, value); gpcr = ioread16(sdev->base + SCOOP_GPCR); gpcr |= 1 << (offset + 1); iowrite16(gpcr, sdev->base + SCOOP_GPCR); spin_unlock_irqrestore(&sdev->scoop_lock, flags); return 0; } unsigned short read_scoop_reg(struct device *dev, unsigned short reg) { struct scoop_dev *sdev = dev_get_drvdata(dev); return ioread16(sdev->base + reg); } void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) { struct scoop_dev *sdev = dev_get_drvdata(dev); iowrite16(data, sdev->base + reg); } EXPORT_SYMBOL(reset_scoop); EXPORT_SYMBOL(read_scoop_reg); EXPORT_SYMBOL(write_scoop_reg); #ifdef CONFIG_PM static void check_scoop_reg(struct scoop_dev *sdev) { unsigned short mcr; mcr = ioread16(sdev->base + SCOOP_MCR); if ((mcr & 0x100) == 0) iowrite16(0x0101, sdev->base + SCOOP_MCR); } static int scoop_suspend(struct platform_device *dev, pm_message_t state) { struct scoop_dev *sdev = platform_get_drvdata(dev); check_scoop_reg(sdev); sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR); iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR); return 0; } static int scoop_resume(struct platform_device *dev) { struct scoop_dev *sdev = platform_get_drvdata(dev); check_scoop_reg(sdev); iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR); return 0; } #else #define scoop_suspend NULL #define scoop_resume NULL #endif static int scoop_probe(struct platform_device *pdev) { struct scoop_dev *devptr; struct scoop_config *inf; struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); int ret; if (!mem) return -EINVAL; devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); if (!devptr) return -ENOMEM; spin_lock_init(&devptr->scoop_lock); inf = pdev->dev.platform_data; devptr->base = ioremap(mem->start, resource_size(mem)); if (!devptr->base) { ret = -ENOMEM; goto err_ioremap; } platform_set_drvdata(pdev, devptr); printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base); iowrite16(0x0140, devptr->base + SCOOP_MCR); reset_scoop(&pdev->dev); iowrite16(0x0000, devptr->base + SCOOP_CPR); iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR); iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR); devptr->suspend_clr = inf->suspend_clr; devptr->suspend_set = inf->suspend_set; devptr->gpio.base = -1; if (inf->gpio_base != 0) { devptr->gpio.label = dev_name(&pdev->dev); devptr->gpio.base = inf->gpio_base; devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */ devptr->gpio.set = scoop_gpio_set; devptr->gpio.get = scoop_gpio_get; devptr->gpio.direction_input = scoop_gpio_direction_input; devptr->gpio.direction_output = scoop_gpio_direction_output; ret = gpiochip_add_data(&devptr->gpio, devptr); if (ret) goto err_gpio; } return 0; err_gpio: platform_set_drvdata(pdev, NULL); err_ioremap: iounmap(devptr->base); kfree(devptr); return ret; } static void scoop_remove(struct platform_device *pdev) { struct scoop_dev *sdev = platform_get_drvdata(pdev); if (sdev->gpio.base != -1) gpiochip_remove(&sdev->gpio); platform_set_drvdata(pdev, NULL); iounmap(sdev->base); kfree(sdev); } static struct platform_driver scoop_driver = { .probe = scoop_probe, .remove = scoop_remove, .suspend = scoop_suspend, .resume = scoop_resume, .driver = { .name = "sharp-scoop", }, }; static int __init scoop_init(void) { return platform_driver_register(&scoop_driver); } subsys_initcall(scoop_init);