Merge branch 'linus' into x86/nmi
[linux-2.6] / arch / arm / mach-s3c2410 / usb-simtec.c
1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
2  *
3  * Copyright (c) 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  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13 */
14
15 #define DEBUG
16
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/list.h>
21 #include <linux/timer.h>
22 #include <linux/init.h>
23 #include <linux/device.h>
24
25 #include <asm/mach/arch.h>
26 #include <asm/mach/map.h>
27 #include <asm/mach/irq.h>
28
29 #include <asm/arch/bast-map.h>
30 #include <asm/arch/bast-irq.h>
31 #include <asm/arch/usb-control.h>
32 #include <asm/arch/regs-gpio.h>
33
34 #include <asm/hardware.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37
38 #include <asm/plat-s3c24xx/devs.h>
39 #include "usb-simtec.h"
40
41 /* control power and monitor over-current events on various Simtec
42  * designed boards.
43 */
44
45 static unsigned int power_state[2];
46
47 static void
48 usb_simtec_powercontrol(int port, int to)
49 {
50         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
51
52         power_state[port] = to;
53
54         if (power_state[0] && power_state[1])
55                 s3c2410_gpio_setpin(S3C2410_GPB4, 0);
56         else
57                 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
58 }
59
60 static irqreturn_t
61 usb_simtec_ocirq(int irq, void *pw)
62 {
63         struct s3c2410_hcd_info *info = pw;
64
65         if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
66                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
67                 s3c2410_usb_report_oc(info, 3);
68         } else {
69                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
70                 s3c2410_usb_report_oc(info, 0);
71         }
72
73         return IRQ_HANDLED;
74 }
75
76 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
77 {
78         int ret;
79
80         if (on) {
81                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
82                                   IRQF_DISABLED | IRQF_TRIGGER_RISING |
83                                    IRQF_TRIGGER_FALLING,
84                                   "USB Over-current", info);
85                 if (ret != 0) {
86                         printk(KERN_ERR "failed to request usb oc irq\n");
87                 }
88         } else {
89                 free_irq(IRQ_USBOC, info);
90         }
91 }
92
93 static struct s3c2410_hcd_info usb_simtec_info = {
94         .port[0]        = {
95                 .flags  = S3C_HCDFLG_USED
96         },
97         .port[1]        = {
98                 .flags  = S3C_HCDFLG_USED
99         },
100
101         .power_control  = usb_simtec_powercontrol,
102         .enable_oc      = usb_simtec_enableoc,
103 };
104
105
106 int usb_simtec_init(void)
107 {
108         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
109         s3c_device_usb.dev.platform_data = &usb_simtec_info;
110
111         s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
112         s3c2410_gpio_setpin(S3C2410_GPB4, 1);
113         return 0;
114 }