1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright 2004-2005 Simtec Electronics
4//   Ben Dooks <ben@simtec.co.uk>
5//
6// http://www.simtec.co.uk/products/EB2410ITX/
7//
8// Simtec BAST and Thorcom VR1000 USB port support functions
9
10#define DEBUG
11
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/interrupt.h>
15#include <linux/list.h>
16#include <linux/gpio.h>
17#include <linux/timer.h>
18#include <linux/init.h>
19#include <linux/device.h>
20#include <linux/io.h>
21
22#include <asm/mach/arch.h>
23#include <asm/mach/map.h>
24#include <asm/mach/irq.h>
25
26#include "gpio-samsung.h"
27#include <mach/irqs.h>
28#include <asm/irq.h>
29
30#include <linux/platform_data/usb-ohci-s3c2410.h>
31#include "devs.h"
32
33#include "bast.h"
34#include "simtec.h"
35
36/* control power and monitor over-current events on various Simtec
37 * designed boards.
38*/
39
40static unsigned int power_state[2];
41
42static void
43usb_simtec_powercontrol(int port, int to)
44{
45	pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
46
47	power_state[port] = to;
48
49	if (power_state[0] && power_state[1])
50		gpio_set_value(S3C2410_GPB(4), 0);
51	else
52		gpio_set_value(S3C2410_GPB(4), 1);
53}
54
55static irqreturn_t
56usb_simtec_ocirq(int irq, void *pw)
57{
58	struct s3c2410_hcd_info *info = pw;
59
60	if (gpio_get_value(S3C2410_GPG(10)) == 0) {
61		pr_debug("usb_simtec: over-current irq (oc detected)\n");
62		s3c2410_usb_report_oc(info, 3);
63	} else {
64		pr_debug("usb_simtec: over-current irq (oc cleared)\n");
65		s3c2410_usb_report_oc(info, 0);
66	}
67
68	return IRQ_HANDLED;
69}
70
71static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
72{
73	int ret;
74
75	if (on) {
76		ret = request_irq(BAST_IRQ_USBOC, usb_simtec_ocirq,
77				  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
78				  "USB Over-current", info);
79		if (ret != 0) {
80			printk(KERN_ERR "failed to request usb oc irq\n");
81		}
82	} else {
83		free_irq(BAST_IRQ_USBOC, info);
84	}
85}
86
87static struct s3c2410_hcd_info usb_simtec_info __initdata = {
88	.port[0]	= {
89		.flags	= S3C_HCDFLG_USED
90	},
91	.port[1]	= {
92		.flags	= S3C_HCDFLG_USED
93	},
94
95	.power_control	= usb_simtec_powercontrol,
96	.enable_oc	= usb_simtec_enableoc,
97};
98
99
100int __init usb_simtec_init(void)
101{
102	int ret;
103
104	printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
105
106	ret = gpio_request(S3C2410_GPB(4), "USB power control");
107	if (ret < 0) {
108		pr_err("%s: failed to get GPB4\n", __func__);
109		return ret;
110	}
111
112	ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
113	if (ret < 0) {
114		pr_err("%s: failed to get GPG10\n", __func__);
115		gpio_free(S3C2410_GPB(4));
116		return ret;
117	}
118
119	/* turn power on */
120	gpio_direction_output(S3C2410_GPB(4), 1);
121	gpio_direction_input(S3C2410_GPG(10));
122
123	s3c_ohci_set_platdata(&usb_simtec_info);
124	return 0;
125}
126