/spare/repo/netdev-2.6 branch 'uli-tulip'
[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  * Modifications:
15  *      14-Sep-2004 BJD  Created
16  *      18-Oct-2004 BJD  Cleanups, and added code to report OC cleared
17  *      09-Aug-2005 BJD  Renamed s3c2410_report_oc to s3c2410_usb_report_oc
18  *      09-Aug-2005 BJD  Ports powered only if both are enabled
19 */
20
21 #define DEBUG
22
23 #include <linux/kernel.h>
24 #include <linux/types.h>
25 #include <linux/interrupt.h>
26 #include <linux/list.h>
27 #include <linux/timer.h>
28 #include <linux/init.h>
29 #include <linux/device.h>
30
31 #include <asm/mach/arch.h>
32 #include <asm/mach/map.h>
33 #include <asm/mach/irq.h>
34
35 #include <asm/arch/bast-map.h>
36 #include <asm/arch/bast-irq.h>
37 #include <asm/arch/usb-control.h>
38 #include <asm/arch/regs-gpio.h>
39
40 #include <asm/hardware.h>
41 #include <asm/io.h>
42 #include <asm/irq.h>
43 #include <asm/mach-types.h>
44
45 #include "devs.h"
46 #include "usb-simtec.h"
47
48 /* control power and monitor over-current events on various Simtec
49  * designed boards.
50 */
51
52 static unsigned int power_state[2];
53
54 static void
55 usb_simtec_powercontrol(int port, int to)
56 {
57         pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
58
59         power_state[port] = to;
60
61         if (power_state[0] && power_state[1])
62                 s3c2410_gpio_setpin(S3C2410_GPB4, 0);
63         else
64                 s3c2410_gpio_setpin(S3C2410_GPB4, 1);
65 }
66
67 static irqreturn_t
68 usb_simtec_ocirq(int irq, void *pw, struct pt_regs *regs)
69 {
70         struct s3c2410_hcd_info *info = (struct s3c2410_hcd_info *)pw;
71
72         if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
73                 pr_debug("usb_simtec: over-current irq (oc detected)\n");
74                 s3c2410_usb_report_oc(info, 3);
75         } else {
76                 pr_debug("usb_simtec: over-current irq (oc cleared)\n");
77                 s3c2410_usb_report_oc(info, 0);
78         }
79
80         return IRQ_HANDLED;
81 }
82
83 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
84 {
85         int ret;
86
87         if (on) {
88                 ret = request_irq(IRQ_USBOC, usb_simtec_ocirq, SA_INTERRUPT,
89                                   "USB Over-current", info);
90                 if (ret != 0) {
91                         printk(KERN_ERR "failed to request usb oc irq\n");
92                 }
93
94                 set_irq_type(IRQ_USBOC, IRQT_BOTHEDGE);
95         } else {
96                 free_irq(IRQ_USBOC, info);
97         }
98 }
99
100 static struct s3c2410_hcd_info usb_simtec_info = {
101         .port[0]        = {
102                 .flags  = S3C_HCDFLG_USED
103         },
104         .port[1]        = {
105                 .flags  = S3C_HCDFLG_USED
106         },
107
108         .power_control  = usb_simtec_powercontrol,
109         .enable_oc      = usb_simtec_enableoc,
110 };
111
112
113 int usb_simtec_init(void)
114 {
115         printk("USB Power Control, (c) 2004 Simtec Electronics\n");
116         s3c_device_usb.dev.platform_data = &usb_simtec_info;
117
118         s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP);
119         s3c2410_gpio_setpin(S3C2410_GPB4, 1);
120         return 0;
121 }