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 
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