1 /*
2 * Copyright (C) 2012 CERN (www.cern.ch)
3 * Author: Alessandro Rubini <rubini@gnudd.com>
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * The software is provided "as is"; the copyright holders disclaim
10 * all warranties and liabilities, to the extent permitted by
11 * applicable law.
12 */
13
14 /* A trivial fmc driver that can load a gateware file and reports interrupts */
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/gpio.h>
19 #include <linux/fmc.h>
20
21 static struct fmc_driver t_drv; /* initialized later */
22
t_handler(int irq,void * dev_id)23 static irqreturn_t t_handler(int irq, void *dev_id)
24 {
25 struct fmc_device *fmc = dev_id;
26
27 fmc_irq_ack(fmc);
28 dev_info(&fmc->dev, "received irq %i\n", irq);
29 return IRQ_HANDLED;
30 }
31
32 static struct fmc_gpio t_gpio[] = {
33 {
34 .gpio = FMC_GPIO_IRQ(0),
35 .mode = GPIOF_DIR_IN,
36 .irqmode = IRQF_TRIGGER_RISING,
37 }, {
38 .gpio = FMC_GPIO_IRQ(1),
39 .mode = GPIOF_DIR_IN,
40 .irqmode = IRQF_TRIGGER_RISING,
41 }
42 };
43
t_probe(struct fmc_device * fmc)44 static int t_probe(struct fmc_device *fmc)
45 {
46 int ret;
47 int index = 0;
48
49 index = fmc_validate(fmc, &t_drv);
50 if (index < 0)
51 return -EINVAL; /* not our device: invalid */
52
53 ret = fmc_irq_request(fmc, t_handler, "fmc-trivial", IRQF_SHARED);
54 if (ret < 0)
55 return ret;
56 /* ignore error code of call below, we really don't care */
57 fmc_gpio_config(fmc, t_gpio, ARRAY_SIZE(t_gpio));
58
59 ret = fmc_reprogram(fmc, &t_drv, "", 0);
60 if (ret == -EPERM) /* programming not supported */
61 ret = 0;
62 if (ret < 0)
63 fmc_irq_free(fmc);
64
65 /* FIXME: reprogram LM32 too */
66 return ret;
67 }
68
t_remove(struct fmc_device * fmc)69 static int t_remove(struct fmc_device *fmc)
70 {
71 fmc_irq_free(fmc);
72 return 0;
73 }
74
75 static struct fmc_driver t_drv = {
76 .version = FMC_VERSION,
77 .driver.name = KBUILD_MODNAME,
78 .probe = t_probe,
79 .remove = t_remove,
80 /* no table, as the current match just matches everything */
81 };
82
83 /* We accept the generic parameters */
84 FMC_PARAM_BUSID(t_drv);
85 FMC_PARAM_GATEWARE(t_drv);
86
t_init(void)87 static int t_init(void)
88 {
89 int ret;
90
91 ret = fmc_driver_register(&t_drv);
92 return ret;
93 }
94
t_exit(void)95 static void t_exit(void)
96 {
97 fmc_driver_unregister(&t_drv);
98 }
99
100 module_init(t_init);
101 module_exit(t_exit);
102
103 MODULE_LICENSE("Dual BSD/GPL");
104
