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path: root/drivers/gpio/janz-ttl.c
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Diffstat (limited to 'drivers/gpio/janz-ttl.c')
-rw-r--r--drivers/gpio/janz-ttl.c258
1 files changed, 0 insertions, 258 deletions
diff --git a/drivers/gpio/janz-ttl.c b/drivers/gpio/janz-ttl.c
deleted file mode 100644
index 813ac077e5d..00000000000
--- a/drivers/gpio/janz-ttl.c
+++ /dev/null
@@ -1,258 +0,0 @@
-/*
- * Janz MODULbus VMOD-TTL GPIO Driver
- *
- * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
- *
- * 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.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-
-#include <linux/mfd/janz.h>
-
-#define DRV_NAME "janz-ttl"
-
-#define PORTA_DIRECTION 0x23
-#define PORTB_DIRECTION 0x2B
-#define PORTC_DIRECTION 0x06
-#define PORTA_IOCTL 0x24
-#define PORTB_IOCTL 0x2C
-#define PORTC_IOCTL 0x07
-
-#define MASTER_INT_CTL 0x00
-#define MASTER_CONF_CTL 0x01
-
-#define CONF_PAE (1 << 2)
-#define CONF_PBE (1 << 7)
-#define CONF_PCE (1 << 4)
-
-struct ttl_control_regs {
- __be16 portc;
- __be16 portb;
- __be16 porta;
- __be16 control;
-};
-
-struct ttl_module {
- struct gpio_chip gpio;
-
- /* base address of registers */
- struct ttl_control_regs __iomem *regs;
-
- u8 portc_shadow;
- u8 portb_shadow;
- u8 porta_shadow;
-
- spinlock_t lock;
-};
-
-static int ttl_get_value(struct gpio_chip *gpio, unsigned offset)
-{
- struct ttl_module *mod = dev_get_drvdata(gpio->dev);
- u8 *shadow;
- int ret;
-
- if (offset < 8) {
- shadow = &mod->porta_shadow;
- } else if (offset < 16) {
- shadow = &mod->portb_shadow;
- offset -= 8;
- } else {
- shadow = &mod->portc_shadow;
- offset -= 16;
- }
-
- spin_lock(&mod->lock);
- ret = *shadow & (1 << offset);
- spin_unlock(&mod->lock);
- return ret;
-}
-
-static void ttl_set_value(struct gpio_chip *gpio, unsigned offset, int value)
-{
- struct ttl_module *mod = dev_get_drvdata(gpio->dev);
- void __iomem *port;
- u8 *shadow;
-
- if (offset < 8) {
- port = &mod->regs->porta;
- shadow = &mod->porta_shadow;
- } else if (offset < 16) {
- port = &mod->regs->portb;
- shadow = &mod->portb_shadow;
- offset -= 8;
- } else {
- port = &mod->regs->portc;
- shadow = &mod->portc_shadow;
- offset -= 16;
- }
-
- spin_lock(&mod->lock);
- if (value)
- *shadow |= (1 << offset);
- else
- *shadow &= ~(1 << offset);
-
- iowrite16be(*shadow, port);
- spin_unlock(&mod->lock);
-}
-
-static void __devinit ttl_write_reg(struct ttl_module *mod, u8 reg, u16 val)
-{
- iowrite16be(reg, &mod->regs->control);
- iowrite16be(val, &mod->regs->control);
-}
-
-static void __devinit ttl_setup_device(struct ttl_module *mod)
-{
- /* reset the device to a known state */
- iowrite16be(0x0000, &mod->regs->control);
- iowrite16be(0x0001, &mod->regs->control);
- iowrite16be(0x0000, &mod->regs->control);
-
- /* put all ports in open-drain mode */
- ttl_write_reg(mod, PORTA_IOCTL, 0x00ff);
- ttl_write_reg(mod, PORTB_IOCTL, 0x00ff);
- ttl_write_reg(mod, PORTC_IOCTL, 0x000f);
-
- /* set all ports as outputs */
- ttl_write_reg(mod, PORTA_DIRECTION, 0x0000);
- ttl_write_reg(mod, PORTB_DIRECTION, 0x0000);
- ttl_write_reg(mod, PORTC_DIRECTION, 0x0000);
-
- /* set all ports to drive zeroes */
- iowrite16be(0x0000, &mod->regs->porta);
- iowrite16be(0x0000, &mod->regs->portb);
- iowrite16be(0x0000, &mod->regs->portc);
-
- /* enable all ports */
- ttl_write_reg(mod, MASTER_CONF_CTL, CONF_PAE | CONF_PBE | CONF_PCE);
-}
-
-static int __devinit ttl_probe(struct platform_device *pdev)
-{
- struct janz_platform_data *pdata;
- struct device *dev = &pdev->dev;
- struct ttl_module *mod;
- struct gpio_chip *gpio;
- struct resource *res;
- int ret;
-
- pdata = pdev->dev.platform_data;
- if (!pdata) {
- dev_err(dev, "no platform data\n");
- ret = -ENXIO;
- goto out_return;
- }
-
- mod = kzalloc(sizeof(*mod), GFP_KERNEL);
- if (!mod) {
- dev_err(dev, "unable to allocate private data\n");
- ret = -ENOMEM;
- goto out_return;
- }
-
- platform_set_drvdata(pdev, mod);
- spin_lock_init(&mod->lock);
-
- /* get access to the MODULbus registers for this module */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(dev, "MODULbus registers not found\n");
- ret = -ENODEV;
- goto out_free_mod;
- }
-
- mod->regs = ioremap(res->start, resource_size(res));
- if (!mod->regs) {
- dev_err(dev, "MODULbus registers not ioremap\n");
- ret = -ENOMEM;
- goto out_free_mod;
- }
-
- ttl_setup_device(mod);
-
- /* Initialize the GPIO data structures */
- gpio = &mod->gpio;
- gpio->dev = &pdev->dev;
- gpio->label = pdev->name;
- gpio->get = ttl_get_value;
- gpio->set = ttl_set_value;
- gpio->owner = THIS_MODULE;
-
- /* request dynamic allocation */
- gpio->base = -1;
- gpio->ngpio = 20;
-
- ret = gpiochip_add(gpio);
- if (ret) {
- dev_err(dev, "unable to add GPIO chip\n");
- goto out_iounmap_regs;
- }
-
- dev_info(&pdev->dev, "module %d: registered GPIO device\n",
- pdata->modno);
- return 0;
-
-out_iounmap_regs:
- iounmap(mod->regs);
-out_free_mod:
- kfree(mod);
-out_return:
- return ret;
-}
-
-static int __devexit ttl_remove(struct platform_device *pdev)
-{
- struct ttl_module *mod = platform_get_drvdata(pdev);
- struct device *dev = &pdev->dev;
- int ret;
-
- ret = gpiochip_remove(&mod->gpio);
- if (ret) {
- dev_err(dev, "unable to remove GPIO chip\n");
- return ret;
- }
-
- iounmap(mod->regs);
- kfree(mod);
- return 0;
-}
-
-static struct platform_driver ttl_driver = {
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
- .probe = ttl_probe,
- .remove = __devexit_p(ttl_remove),
-};
-
-static int __init ttl_init(void)
-{
- return platform_driver_register(&ttl_driver);
-}
-
-static void __exit ttl_exit(void)
-{
- platform_driver_unregister(&ttl_driver);
-}
-
-MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
-MODULE_DESCRIPTION("Janz MODULbus VMOD-TTL Driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:janz-ttl");
-
-module_init(ttl_init);
-module_exit(ttl_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:15:30 +0000