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ddb27f3bf7
This driver supports GRGPIO gpio cores available in the GRLIB VHDL IP core library from Aeroflex Gaisler. Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
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* Driver for Aeroflex Gaisler GRGPIO General Purpose I/O cores.
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*
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* 2013 (c) Aeroflex Gaisler AB
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*
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* This driver supports the GRGPIO GPIO core available in the GRLIB VHDL
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* IP core library.
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*
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* Full documentation of the GRGPIO core can be found here:
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* http://www.gaisler.com/products/grlib/grip.pdf
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*
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* See "Documentation/devicetree/bindings/gpio/gpio-grgpio.txt" for
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* information on open firmware properties.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Contributors: Andreas Larsson <andreas@gaisler.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/basic_mmio_gpio.h>
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#define GRGPIO_MAX_NGPIO 32
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#define GRGPIO_DATA 0x00
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#define GRGPIO_OUTPUT 0x04
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#define GRGPIO_DIR 0x08
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#define GRGPIO_IMASK 0x0c
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#define GRGPIO_IPOL 0x10
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#define GRGPIO_IEDGE 0x14
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#define GRGPIO_BYPASS 0x18
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#define GRGPIO_IMAP_BASE 0x20
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struct grgpio_priv {
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struct bgpio_chip bgc;
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void __iomem *regs;
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struct device *dev;
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};
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static inline struct grgpio_priv *grgpio_gc_to_priv(struct gpio_chip *gc)
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{
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struct bgpio_chip *bgc = to_bgpio_chip(gc);
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return container_of(bgc, struct grgpio_priv, bgc);
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}
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static int grgpio_probe(struct platform_device *ofdev)
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{
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struct device_node *np = ofdev->dev.of_node;
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void __iomem *regs;
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struct gpio_chip *gc;
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struct bgpio_chip *bgc;
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struct grgpio_priv *priv;
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struct resource *res;
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int err;
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u32 prop;
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priv = devm_kzalloc(&ofdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(&ofdev->dev, res);
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if (IS_ERR(regs))
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return PTR_ERR(regs);
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bgc = &priv->bgc;
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err = bgpio_init(bgc, &ofdev->dev, 4, regs + GRGPIO_DATA,
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regs + GRGPIO_OUTPUT, NULL, regs + GRGPIO_DIR, NULL,
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BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (err) {
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dev_err(&ofdev->dev, "bgpio_init() failed\n");
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return err;
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}
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priv->regs = regs;
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priv->dev = &ofdev->dev;
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gc = &bgc->gc;
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gc->of_node = np;
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gc->owner = THIS_MODULE;
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gc->label = np->full_name;
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gc->base = -1;
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err = of_property_read_u32(np, "nbits", &prop);
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if (err || prop <= 0 || prop > GRGPIO_MAX_NGPIO) {
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gc->ngpio = GRGPIO_MAX_NGPIO;
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dev_dbg(&ofdev->dev,
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"No or invalid nbits property: assume %d\n", gc->ngpio);
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} else {
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gc->ngpio = prop;
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}
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platform_set_drvdata(ofdev, priv);
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err = gpiochip_add(gc);
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if (err) {
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dev_err(&ofdev->dev, "Could not add gpiochip\n");
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return err;
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}
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dev_info(&ofdev->dev, "regs=0x%p, base=%d, ngpio=%d\n",
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priv->regs, gc->base, gc->ngpio);
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return 0;
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}
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static int grgpio_remove(struct platform_device *ofdev)
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{
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struct grgpio_priv *priv = platform_get_drvdata(ofdev);
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return gpiochip_remove(&priv->bgc.gc);
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}
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static struct of_device_id grgpio_match[] = {
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{.name = "GAISLER_GPIO"},
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{.name = "01_01a"},
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{},
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};
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MODULE_DEVICE_TABLE(of, grgpio_match);
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static struct platform_driver grgpio_driver = {
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.driver = {
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.name = "grgpio",
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.owner = THIS_MODULE,
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.of_match_table = grgpio_match,
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},
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.probe = grgpio_probe,
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.remove = grgpio_remove,
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};
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module_platform_driver(grgpio_driver);
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MODULE_AUTHOR("Aeroflex Gaisler AB.");
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MODULE_DESCRIPTION("Driver for Aeroflex Gaisler GRGPIO");
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MODULE_LICENSE("GPL");
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