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v3.5.6
  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/compiler.h>
 22#include <linux/init.h>
 23#include <linux/io.h>
 24#include <linux/of.h>
 25#include <linux/of_device.h>
 26#include <linux/of_platform.h>
 27#include <linux/of_gpio.h>
 28#include <linux/gpio.h>
 29#include <linux/slab.h>
 
 
 30#include <linux/module.h>
 
 31
 32#define GEF_GPIO_DIRECT		0x00
 33#define GEF_GPIO_IN		0x04
 34#define GEF_GPIO_OUT		0x08
 35#define GEF_GPIO_TRIG		0x0C
 36#define GEF_GPIO_POLAR_A	0x10
 37#define GEF_GPIO_POLAR_B	0x14
 38#define GEF_GPIO_INT_STAT	0x18
 39#define GEF_GPIO_OVERRUN	0x1C
 40#define GEF_GPIO_MODE		0x20
 41
 42static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
 43{
 44	unsigned int data;
 45
 46	data = ioread32be(reg);
 47	/* value: 0=low; 1=high */
 48	if (value & 0x1)
 49		data = data | (0x1 << offset);
 50	else
 51		data = data & ~(0x1 << offset);
 52
 53	iowrite32be(data, reg);
 54}
 55
 56
 57static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
 58{
 59	unsigned int data;
 60	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 61
 62	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
 63	data = data | (0x1 << offset);
 64	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
 65
 66	return 0;
 67}
 68
 69static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
 70{
 71	unsigned int data;
 72	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 73
 74	/* Set direction before switching to input */
 75	_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
 76
 77	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
 78	data = data & ~(0x1 << offset);
 79	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
 80
 81	return 0;
 82}
 83
 84static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
 85{
 86	unsigned int data;
 87	int state = 0;
 88	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 89
 90	data = ioread32be(mmchip->regs + GEF_GPIO_IN);
 91	state = (int)((data >> offset) & 0x1);
 92
 93	return state;
 94}
 95
 96static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 97{
 98	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 99
100	_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
101}
102
103static int __init gef_gpio_init(void)
104{
105	struct device_node *np;
106	int retval;
107	struct of_mm_gpio_chip *gef_gpio_chip;
108
109	for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
110
111		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
112
113		/* Allocate chip structure */
114		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
115		if (!gef_gpio_chip) {
116			pr_err("%s: Unable to allocate structure\n",
117				np->full_name);
118			continue;
119		}
120
121		/* Setup pointers to chip functions */
122		gef_gpio_chip->gc.of_gpio_n_cells = 2;
123		gef_gpio_chip->gc.ngpio = 19;
124		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
125		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
126		gef_gpio_chip->gc.get = gef_gpio_get;
127		gef_gpio_chip->gc.set = gef_gpio_set;
128
129		/* This function adds a memory mapped GPIO chip */
130		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
131		if (retval) {
132			kfree(gef_gpio_chip);
133			pr_err("%s: Unable to add GPIO\n", np->full_name);
134		}
135	}
136
137	for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
138
139		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
140
141		/* Allocate chip structure */
142		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
143		if (!gef_gpio_chip) {
144			pr_err("%s: Unable to allocate structure\n",
145				np->full_name);
146			continue;
147		}
148
149		/* Setup pointers to chip functions */
150		gef_gpio_chip->gc.of_gpio_n_cells = 2;
151		gef_gpio_chip->gc.ngpio = 6;
152		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
153		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
154		gef_gpio_chip->gc.get = gef_gpio_get;
155		gef_gpio_chip->gc.set = gef_gpio_set;
156
157		/* This function adds a memory mapped GPIO chip */
158		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
159		if (retval) {
160			kfree(gef_gpio_chip);
161			pr_err("%s: Unable to add GPIO\n", np->full_name);
162		}
163	}
164
165	for_each_compatible_node(np, NULL, "ge,imp3a-gpio") {
166
167		pr_debug("%s: Initialising GE GPIO\n", np->full_name);
168
169		/* Allocate chip structure */
170		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
171		if (!gef_gpio_chip) {
172			pr_err("%s: Unable to allocate structure\n",
173				np->full_name);
174			continue;
175		}
176
177		/* Setup pointers to chip functions */
178		gef_gpio_chip->gc.of_gpio_n_cells = 2;
179		gef_gpio_chip->gc.ngpio = 16;
180		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
181		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
182		gef_gpio_chip->gc.get = gef_gpio_get;
183		gef_gpio_chip->gc.set = gef_gpio_set;
184
185		/* This function adds a memory mapped GPIO chip */
186		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
187		if (retval) {
188			kfree(gef_gpio_chip);
189			pr_err("%s: Unable to add GPIO\n", np->full_name);
190		}
191	}
192
193	return 0;
 
 
 
 
 
 
 
 
 
 
 
194};
195arch_initcall(gef_gpio_init);
196
197MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
198MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
199MODULE_LICENSE("GPL");
v5.4
  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	gc->of_node = pdev->dev.of_node;
 86
 87	/* This function adds a memory mapped GPIO chip */
 88	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
 89	if (ret)
 90		goto err0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 91
 92	return 0;
 93err0:
 94	iounmap(regs);
 95	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
 96	return ret;
 97};
 98
 99static struct platform_driver gef_gpio_driver = {
100	.driver = {
101		.name		= "gef-gpio",
102		.of_match_table	= gef_gpio_ids,
103	},
104};
105module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
106
107MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
108MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
109MODULE_LICENSE("GPL");