gpio-ge.c (0c49cd295d42d0032af11d55e2140dbec11dc8d0) gpio-ge.c (866010fb7ea03b73a0528b99298254c43ac12888)
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

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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/of_device.h>
23#include <linux/of_gpio.h>
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

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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/of_device.h>
23#include <linux/of_gpio.h>
24#include <linux/of_address.h>
24#include <linux/module.h>
25#include <linux/module.h>
26#include <linux/basic_mmio_gpio.h>
25
26#define GEF_GPIO_DIRECT 0x00
27#define GEF_GPIO_IN 0x04
28#define GEF_GPIO_OUT 0x08
29#define GEF_GPIO_TRIG 0x0C
30#define GEF_GPIO_POLAR_A 0x10
31#define GEF_GPIO_POLAR_B 0x14
32#define GEF_GPIO_INT_STAT 0x18
33#define GEF_GPIO_OVERRUN 0x1C
34#define GEF_GPIO_MODE 0x20
35
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
36static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
37{
38 struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
39 unsigned int data;
40
41 data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
42 if (value)
43 data = data | BIT(offset);
44 else
45 data = data & ~BIT(offset);
46 iowrite32be(data, mmchip->regs + GEF_GPIO_OUT);
47}
48
49static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
50{
51 unsigned int data;
52 struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
53
54 data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
55 data = data | BIT(offset);
56 iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
57
58 return 0;
59}
60
61static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
62{
63 unsigned int data;
64 struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
65
66 /* Set value before switching to output */
67 gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
68
69 data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
70 data = data & ~BIT(offset);
71 iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
72
73 return 0;
74}
75
76static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
77{
78 struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
79
80 return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
81}
82
83static const struct of_device_id gef_gpio_ids[] = {
84 {
85 .compatible = "gef,sbc610-gpio",
86 .data = (void *)19,
87 }, {
88 .compatible = "gef,sbc310-gpio",
89 .data = (void *)6,
90 }, {
91 .compatible = "ge,imp3a-gpio",
92 .data = (void *)16,
93 },
94 { }
95};
96MODULE_DEVICE_TABLE(of, gef_gpio_ids);
97
98static int __init gef_gpio_probe(struct platform_device *pdev)
99{
100 const struct of_device_id *of_id =
101 of_match_device(gef_gpio_ids, &pdev->dev);
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 const struct of_device_id *of_id =
56 of_match_device(gef_gpio_ids, &pdev->dev);
102 struct of_mm_gpio_chip *mmchip;
57 struct bgpio_chip *bgc;
58 void __iomem *regs;
59 int ret;
103
60
104 mmchip = devm_kzalloc(&pdev->dev, sizeof(*mmchip), GFP_KERNEL);
105 if (!mmchip)
61 bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
62 if (!bgc)
106 return -ENOMEM;
107
63 return -ENOMEM;
64
65 regs = of_iomap(pdev->dev.of_node, 0);
66 if (!regs)
67 return -ENOMEM;
68
69 ret = bgpio_init(bgc, &pdev->dev, 4, regs + GEF_GPIO_IN,
70 regs + GEF_GPIO_OUT, NULL, NULL,
71 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
72 if (ret) {
73 dev_err(&pdev->dev, "bgpio_init failed\n");
74 goto err0;
75 }
76
108 /* Setup pointers to chip functions */
77 /* Setup pointers to chip functions */
109 mmchip->gc.ngpio = (u16)(uintptr_t)of_id->data;
110 mmchip->gc.of_gpio_n_cells = 2;
111 mmchip->gc.direction_input = gef_gpio_dir_in;
112 mmchip->gc.direction_output = gef_gpio_dir_out;
113 mmchip->gc.get = gef_gpio_get;
114 mmchip->gc.set = gef_gpio_set;
78 bgc->gc.label = kstrdup(pdev->dev.of_node->full_name, GFP_KERNEL);
79 if (!bgc->gc.label)
80 goto err0;
115
81
82 bgc->gc.base = -1;
83 bgc->gc.ngpio = (u16)(uintptr_t)of_id->data;
84 bgc->gc.of_gpio_n_cells = 2;
85 bgc->gc.of_node = pdev->dev.of_node;
86
116 /* This function adds a memory mapped GPIO chip */
87 /* This function adds a memory mapped GPIO chip */
117 return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
88 ret = gpiochip_add(&bgc->gc);
89 if (ret)
90 goto err1;
91
92 return 0;
93err1:
94 kfree(bgc->gc.label);
95err0:
96 iounmap(regs);
97 pr_err("%s: GPIO chip registration failed\n",
98 pdev->dev.of_node->full_name);
99 return ret;
118};
119
120static struct platform_driver gef_gpio_driver = {
121 .driver = {
122 .name = "gef-gpio",
123 .of_match_table = gef_gpio_ids,
124 },
125};
126module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
127
128MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
129MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
130MODULE_LICENSE("GPL");
100};
101
102static struct platform_driver gef_gpio_driver = {
103 .driver = {
104 .name = "gef-gpio",
105 .of_match_table = gef_gpio_ids,
106 },
107};
108module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
109
110MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
111MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
112MODULE_LICENSE("GPL");