cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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gpio-ge.c (2650B)

      1/*
      2 * Driver for GE FPGA based GPIO
      3 *
      4 * Author: Martyn Welch <martyn.welch@ge.com>
      5 *
      6 * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
      7 *
      8 * This file is licensed under the terms of the GNU General Public License
      9 * version 2.  This program is licensed "as is" without any warranty of any
     10 * kind, whether express or implied.
     11 */
     12
     13/* TODO
     14 *
     15 * Configuration of output modes (totem-pole/open-drain)
     16 * Interrupt configuration - interrupts are always generated the FPGA relies on
     17 * the I/O interrupt controllers mask to stop them propergating
     18 */
     19
     20#include <linux/kernel.h>
     21#include <linux/io.h>
     22#include <linux/slab.h>
     23#include <linux/of_device.h>
     24#include <linux/of_address.h>
     25#include <linux/module.h>
     26#include <linux/gpio/driver.h>
     27
     28#define GEF_GPIO_DIRECT		0x00
     29#define GEF_GPIO_IN		0x04
     30#define GEF_GPIO_OUT		0x08
     31#define GEF_GPIO_TRIG		0x0C
     32#define GEF_GPIO_POLAR_A	0x10
     33#define GEF_GPIO_POLAR_B	0x14
     34#define GEF_GPIO_INT_STAT	0x18
     35#define GEF_GPIO_OVERRUN	0x1C
     36#define GEF_GPIO_MODE		0x20
     37
     38static const struct of_device_id gef_gpio_ids[] = {
     39	{
     40		.compatible	= "gef,sbc610-gpio",
     41		.data		= (void *)19,
     42	}, {
     43		.compatible	= "gef,sbc310-gpio",
     44		.data		= (void *)6,
     45	}, {
     46		.compatible	= "ge,imp3a-gpio",
     47		.data		= (void *)16,
     48	},
     49	{ }
     50};
     51MODULE_DEVICE_TABLE(of, gef_gpio_ids);
     52
     53static int __init gef_gpio_probe(struct platform_device *pdev)
     54{
     55	struct gpio_chip *gc;
     56	void __iomem *regs;
     57	int ret;
     58
     59	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
     60	if (!gc)
     61		return -ENOMEM;
     62
     63	regs = of_iomap(pdev->dev.of_node, 0);
     64	if (!regs)
     65		return -ENOMEM;
     66
     67	ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
     68			 regs + GEF_GPIO_OUT, NULL, NULL,
     69			 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
     70	if (ret) {
     71		dev_err(&pdev->dev, "bgpio_init failed\n");
     72		goto err0;
     73	}
     74
     75	/* Setup pointers to chip functions */
     76	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
     77	if (!gc->label) {
     78		ret = -ENOMEM;
     79		goto err0;
     80	}
     81
     82	gc->base = -1;
     83	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
     84	gc->of_gpio_n_cells = 2;
     85
     86	/* This function adds a memory mapped GPIO chip */
     87	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
     88	if (ret)
     89		goto err0;
     90
     91	return 0;
     92err0:
     93	iounmap(regs);
     94	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
     95	return ret;
     96};
     97
     98static struct platform_driver gef_gpio_driver = {
     99	.driver = {
    100		.name		= "gef-gpio",
    101		.of_match_table	= gef_gpio_ids,
    102	},
    103};
    104module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
    105
    106MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
    107MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
    108MODULE_LICENSE("GPL");