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 "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
40 static unsigned int power_state[2];
41
42 static void
usb_simtec_powercontrol(int port,int to)43 usb_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
55 static irqreturn_t
usb_simtec_ocirq(int irq,void * pw)56 usb_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
usb_simtec_enableoc(struct s3c2410_hcd_info * info,int on)71 static 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
87 static 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
usb_simtec_init(void)100 int __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