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 <grant.likely@secretlab.ca>

1 files changed, 0 insertions, 548 deletions

diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c
deleted file mode 100644
index 8152e9f516b0..000000000000
--- a/drivers/gpio/basic_mmio_gpio.c
+++ /dev/null
@@ -1,548 +0,0 @@
-/*
- * Driver for basic memory-mapped GPIO controllers.
- *
- * Copyright 2008 MontaVista Software, Inc.
- * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
- *
- * 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.
- *
- * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`.......
- * ...``                                                         ```````..
- * ..The simplest form of a GPIO controller that the driver supports is``
- *  `.just a single "data" register, where GPIO state can be read and/or `
- *    `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.```````
- *        `````````
-                                    ___
-_/~~|___/~|   . ```~~~~~~       ___/___\___     ,~.`.`.`.`````.~~...,,,,...
-__________|~$@~~~        %~    /o*o*o*o*o*o\   .. Implementing such a GPIO .
-o        `                     ~~~~\___/~~~~    ` controller in FPGA is ,.`
-                                                 `....trivial..'~`.```.```
- *                                                    ```````
- *  .```````~~~~`..`.``.``.
- * .  The driver supports  `...       ,..```.`~~~```````````````....````.``,,
- * .   big-endian notation, just`.  .. A bit more sophisticated controllers ,
- *  . register the device with -be`. .with a pair of set/clear-bit registers ,
- *   `.. suffix.  ```~~`````....`.`   . affecting the data register and the .`
- *     ``.`.``...```                  ```.. output pins are also supported.`
- *                        ^^             `````.`````````.,``~``~``~~``````
- *                                                   .                  ^^
- *   ,..`.`.`...````````````......`.`.`.`.`.`..`.`.`..
- * .. The expectation is that in at least some cases .    ,-~~~-,
- *  .this will be used with roll-your-own ASIC/FPGA .`     \   /
- *  .logic in Verilog or VHDL. ~~~`````````..`````~~`       \ /
- *  ..````````......```````````                             \o_
- *                                                           |
- *                              ^^                          / \
- *
- *           ...`````~~`.....``.`..........``````.`.``.```........``.
- *            `  8, 16, 32 and 64 bits registers are supported, and``.
- *            . the number of GPIOs is determined by the width of   ~
- *             .. the registers. ,............```.`.`..`.`.~~~.`.`.`~
- *               `.......````.```
- */
-
-#include <linux/init.h>
-#include <linux/err.h>
-#include <linux/bug.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/compiler.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/log2.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
-#include <linux/platform_device.h>
-#include <linux/mod_devicetable.h>
-#include <linux/basic_mmio_gpio.h>
-
-static void bgpio_write8(void __iomem *reg, unsigned long data)
-{
-	writeb(data, reg);
-}
-
-static unsigned long bgpio_read8(void __iomem *reg)
-{
-	return readb(reg);
-}
-
-static void bgpio_write16(void __iomem *reg, unsigned long data)
-{
-	writew(data, reg);
-}
-
-static unsigned long bgpio_read16(void __iomem *reg)
-{
-	return readw(reg);
-}
-
-static void bgpio_write32(void __iomem *reg, unsigned long data)
-{
-	writel(data, reg);
-}
-
-static unsigned long bgpio_read32(void __iomem *reg)
-{
-	return readl(reg);
-}
-
-#if BITS_PER_LONG >= 64
-static void bgpio_write64(void __iomem *reg, unsigned long data)
-{
-	writeq(data, reg);
-}
-
-static unsigned long bgpio_read64(void __iomem *reg)
-{
-	return readq(reg);
-}
-#endif /* BITS_PER_LONG >= 64 */
-
-static unsigned long bgpio_pin2mask(struct bgpio_chip *bgc, unsigned int pin)
-{
-	return 1 << pin;
-}
-
-static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc,
-				       unsigned int pin)
-{
-	return 1 << (bgc->bits - 1 - pin);
-}
-
-static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-
-	return bgc->read_reg(bgc->reg_dat) & bgc->pin2mask(bgc, gpio);
-}
-
-static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long mask = bgc->pin2mask(bgc, gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	if (val)
-		bgc->data |= mask;
-	else
-		bgc->data &= ~mask;
-
-	bgc->write_reg(bgc->reg_dat, bgc->data);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-}
-
-static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
-				 int val)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long mask = bgc->pin2mask(bgc, gpio);
-
-	if (val)
-		bgc->write_reg(bgc->reg_set, mask);
-	else
-		bgc->write_reg(bgc->reg_clr, mask);
-}
-
-static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long mask = bgc->pin2mask(bgc, gpio);
-	unsigned long flags;
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	if (val)
-		bgc->data |= mask;
-	else
-		bgc->data &= ~mask;
-
-	bgc->write_reg(bgc->reg_set, bgc->data);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-}
-
-static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
-{
-	return 0;
-}
-
-static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
-				int val)
-{
-	gc->set(gc, gpio, val);
-
-	return 0;
-}
-
-static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long flags;
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	bgc->dir &= ~bgc->pin2mask(bgc, gpio);
-	bgc->write_reg(bgc->reg_dir, bgc->dir);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-
-	return 0;
-}
-
-static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long flags;
-
-	gc->set(gc, gpio, val);
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	bgc->dir |= bgc->pin2mask(bgc, gpio);
-	bgc->write_reg(bgc->reg_dir, bgc->dir);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-
-	return 0;
-}
-
-static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long flags;
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	bgc->dir |= bgc->pin2mask(bgc, gpio);
-	bgc->write_reg(bgc->reg_dir, bgc->dir);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-
-	return 0;
-}
-
-static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val)
-{
-	struct bgpio_chip *bgc = to_bgpio_chip(gc);
-	unsigned long flags;
-
-	gc->set(gc, gpio, val);
-
-	spin_lock_irqsave(&bgc->lock, flags);
-
-	bgc->dir &= ~bgc->pin2mask(bgc, gpio);
-	bgc->write_reg(bgc->reg_dir, bgc->dir);
-
-	spin_unlock_irqrestore(&bgc->lock, flags);
-
-	return 0;
-}
-
-static int bgpio_setup_accessors(struct device *dev,
-				 struct bgpio_chip *bgc,
-				 bool be)
-{
-
-	switch (bgc->bits) {
-	case 8:
-		bgc->read_reg	= bgpio_read8;
-		bgc->write_reg	= bgpio_write8;
-		break;
-	case 16:
-		bgc->read_reg	= bgpio_read16;
-		bgc->write_reg	= bgpio_write16;
-		break;
-	case 32:
-		bgc->read_reg	= bgpio_read32;
-		bgc->write_reg	= bgpio_write32;
-		break;
-#if BITS_PER_LONG >= 64
-	case 64:
-		bgc->read_reg	= bgpio_read64;
-		bgc->write_reg	= bgpio_write64;
-		break;
-#endif /* BITS_PER_LONG >= 64 */
-	default:
-		dev_err(dev, "unsupported data width %u bits\n", bgc->bits);
-		return -EINVAL;
-	}
-
-	bgc->pin2mask = be ? bgpio_pin2mask_be : bgpio_pin2mask;
-
-	return 0;
-}
-
-/*
- * Create the device and allocate the resources.  For setting GPIO's there are
- * three supported configurations:
- *
- *	- single input/output register resource (named "dat").
- *	- set/clear pair (named "set" and "clr").
- *	- single output register resource and single input resource ("set" and
- *	dat").
- *
- * For the single output register, this drives a 1 by setting a bit and a zero
- * by clearing a bit.  For the set clr pair, this drives a 1 by setting a bit
- * in the set register and clears it by setting a bit in the clear register.
- * The configuration is detected by which resources are present.
- *
- * For setting the GPIO direction, there are three supported configurations:
- *
- *	- simple bidirection GPIO that requires no configuration.
- *	- an output direction register (named "dirout") where a 1 bit
- *	indicates the GPIO is an output.
- *	- an input direction register (named "dirin") where a 1 bit indicates
- *	the GPIO is an input.
- */
-static int bgpio_setup_io(struct bgpio_chip *bgc,
-			  void __iomem *dat,
-			  void __iomem *set,
-			  void __iomem *clr)
-{
-
-	bgc->reg_dat = dat;
-	if (!bgc->reg_dat)
-		return -EINVAL;
-
-	if (set && clr) {
-		bgc->reg_set = set;
-		bgc->reg_clr = clr;
-		bgc->gc.set = bgpio_set_with_clear;
-	} else if (set && !clr) {
-		bgc->reg_set = set;
-		bgc->gc.set = bgpio_set_set;
-	} else {
-		bgc->gc.set = bgpio_set;
-	}
-
-	bgc->gc.get = bgpio_get;
-
-	return 0;
-}
-
-static int bgpio_setup_direction(struct bgpio_chip *bgc,
-				 void __iomem *dirout,
-				 void __iomem *dirin)
-{
-	if (dirout && dirin) {
-		return -EINVAL;
-	} else if (dirout) {
-		bgc->reg_dir = dirout;
-		bgc->gc.direction_output = bgpio_dir_out;
-		bgc->gc.direction_input = bgpio_dir_in;
-	} else if (dirin) {
-		bgc->reg_dir = dirin;
-		bgc->gc.direction_output = bgpio_dir_out_inv;
-		bgc->gc.direction_input = bgpio_dir_in_inv;
-	} else {
-		bgc->gc.direction_output = bgpio_simple_dir_out;
-		bgc->gc.direction_input = bgpio_simple_dir_in;
-	}
-
-	return 0;
-}
-
-int __devexit bgpio_remove(struct bgpio_chip *bgc)
-{
-	int err = gpiochip_remove(&bgc->gc);
-
-	kfree(bgc);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(bgpio_remove);
-
-int __devinit bgpio_init(struct bgpio_chip *bgc,
-			 struct device *dev,
-			 unsigned long sz,
-			 void __iomem *dat,
-			 void __iomem *set,
-			 void __iomem *clr,
-			 void __iomem *dirout,
-			 void __iomem *dirin,
-			 bool big_endian)
-{
-	int ret;
-
-	if (!is_power_of_2(sz))
-		return -EINVAL;
-
-	bgc->bits = sz * 8;
-	if (bgc->bits > BITS_PER_LONG)
-		return -EINVAL;
-
-	spin_lock_init(&bgc->lock);
-	bgc->gc.dev = dev;
-	bgc->gc.label = dev_name(dev);
-	bgc->gc.base = -1;
-	bgc->gc.ngpio = bgc->bits;
-
-	ret = bgpio_setup_io(bgc, dat, set, clr);
-	if (ret)
-		return ret;
-
-	ret = bgpio_setup_accessors(dev, bgc, big_endian);
-	if (ret)
-		return ret;
-
-	ret = bgpio_setup_direction(bgc, dirout, dirin);
-	if (ret)
-		return ret;
-
-	bgc->data = bgc->read_reg(bgc->reg_dat);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(bgpio_init);
-
-#ifdef CONFIG_GPIO_BASIC_MMIO
-
-static void __iomem *bgpio_map(struct platform_device *pdev,
-			       const char *name,
-			       resource_size_t sane_sz,
-			       int *err)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *r;
-	resource_size_t start;
-	resource_size_t sz;
-	void __iomem *ret;
-
-	*err = 0;
-
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
-	if (!r)
-		return NULL;
-
-	sz = resource_size(r);
-	if (sz != sane_sz) {
-		*err = -EINVAL;
-		return NULL;
-	}
-
-	start = r->start;
-	if (!devm_request_mem_region(dev, start, sz, r->name)) {
-		*err = -EBUSY;
-		return NULL;
-	}
-
-	ret = devm_ioremap(dev, start, sz);
-	if (!ret) {
-		*err = -ENOMEM;
-		return NULL;
-	}
-
-	return ret;
-}
-
-static int __devinit bgpio_pdev_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *r;
-	void __iomem *dat;
-	void __iomem *set;
-	void __iomem *clr;
-	void __iomem *dirout;
-	void __iomem *dirin;
-	unsigned long sz;
-	bool be;
-	int err;
-	struct bgpio_chip *bgc;
-	struct bgpio_pdata *pdata = dev_get_platdata(dev);
-
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
-	if (!r)
-		return -EINVAL;
-
-	sz = resource_size(r);
-
-	dat = bgpio_map(pdev, "dat", sz, &err);
-	if (!dat)
-		return err ? err : -EINVAL;
-
-	set = bgpio_map(pdev, "set", sz, &err);
-	if (err)
-		return err;
-
-	clr = bgpio_map(pdev, "clr", sz, &err);
-	if (err)
-		return err;
-
-	dirout = bgpio_map(pdev, "dirout", sz, &err);
-	if (err)
-		return err;
-
-	dirin = bgpio_map(pdev, "dirin", sz, &err);
-	if (err)
-		return err;
-
-	be = !strcmp(platform_get_device_id(pdev)->name, "basic-mmio-gpio-be");
-
-	bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
-	if (!bgc)
-		return -ENOMEM;
-
-	err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, be);
-	if (err)
-		return err;
-
-	if (pdata) {
-		bgc->gc.base = pdata->base;
-		if (pdata->ngpio > 0)
-			bgc->gc.ngpio = pdata->ngpio;
-	}
-
-	platform_set_drvdata(pdev, bgc);
-
-	return gpiochip_add(&bgc->gc);
-}
-
-static int __devexit bgpio_pdev_remove(struct platform_device *pdev)
-{
-	struct bgpio_chip *bgc = platform_get_drvdata(pdev);
-
-	return bgpio_remove(bgc);
-}
-
-static const struct platform_device_id bgpio_id_table[] = {
-	{ "basic-mmio-gpio", },
-	{ "basic-mmio-gpio-be", },
-	{},
-};
-MODULE_DEVICE_TABLE(platform, bgpio_id_table);
-
-static struct platform_driver bgpio_driver = {
-	.driver = {
-		.name = "basic-mmio-gpio",
-	},
-	.id_table = bgpio_id_table,
-	.probe = bgpio_pdev_probe,
-	.remove = __devexit_p(bgpio_pdev_remove),
-};
-
-static int __init bgpio_platform_init(void)
-{
-	return platform_driver_register(&bgpio_driver);
-}
-module_init(bgpio_platform_init);
-
-static void __exit bgpio_platform_exit(void)
-{
-	platform_driver_unregister(&bgpio_driver);
-}
-module_exit(bgpio_platform_exit);
-
-#endif /* CONFIG_GPIO_BASIC_MMIO */
-
-MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers");
-MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
-MODULE_LICENSE("GPL");