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