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simtec-usb.c
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1 /* linux/arch/arm/mach-s3c2410/usb-simtec.c
2  *
3  * Copyright 2004-2005 Simtec Electronics
4  * Ben Dooks <[email protected]>
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/gpio.h>
22 #include <linux/timer.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/io.h>
26 
27 #include <asm/mach/arch.h>
28 #include <asm/mach/map.h>
29 #include <asm/mach/irq.h>
30 
31 #include <mach/bast-map.h>
32 #include <mach/bast-irq.h>
33 
34 #include <mach/hardware.h>
35 #include <asm/irq.h>
36 
38 #include <plat/devs.h>
39 
40 #include "simtec.h"
41 
42 /* control power and monitor over-current events on various Simtec
43  * designed boards.
44 */
45 
46 static unsigned int power_state[2];
47 
48 static void
49 usb_simtec_powercontrol(int port, int to)
50 {
51  pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
52 
53  power_state[port] = to;
54 
55  if (power_state[0] && power_state[1])
57  else
59 }
60 
61 static irqreturn_t
62 usb_simtec_ocirq(int irq, void *pw)
63 {
64  struct s3c2410_hcd_info *info = pw;
65 
66  if (gpio_get_value(S3C2410_GPG(10)) == 0) {
67  pr_debug("usb_simtec: over-current irq (oc detected)\n");
68  s3c2410_usb_report_oc(info, 3);
69  } else {
70  pr_debug("usb_simtec: over-current irq (oc cleared)\n");
71  s3c2410_usb_report_oc(info, 0);
72  }
73 
74  return IRQ_HANDLED;
75 }
76 
77 static void usb_simtec_enableoc(struct s3c2410_hcd_info *info, int on)
78 {
79  int ret;
80 
81  if (on) {
82  ret = request_irq(IRQ_USBOC, usb_simtec_ocirq,
85  "USB Over-current", info);
86  if (ret != 0) {
87  printk(KERN_ERR "failed to request usb oc irq\n");
88  }
89  } else {
90  free_irq(IRQ_USBOC, info);
91  }
92 }
93 
94 static struct s3c2410_hcd_info usb_simtec_info __initdata = {
95  .port[0] = {
96  .flags = S3C_HCDFLG_USED
97  },
98  .port[1] = {
99  .flags = S3C_HCDFLG_USED
100  },
101 
102  .power_control = usb_simtec_powercontrol,
103  .enable_oc = usb_simtec_enableoc,
104 };
105 
106 
108 {
109  int ret;
110 
111  printk("USB Power Control, Copyright 2004 Simtec Electronics\n");
112 
113  ret = gpio_request(S3C2410_GPB(4), "USB power control");
114  if (ret < 0) {
115  pr_err("%s: failed to get GPB4\n", __func__);
116  return ret;
117  }
118 
119  ret = gpio_request(S3C2410_GPG(10), "USB overcurrent");
120  if (ret < 0) {
121  pr_err("%s: failed to get GPG10\n", __func__);
123  return ret;
124  }
125 
126  /* turn power on */
129 
130  s3c_ohci_set_platdata(&usb_simtec_info);
131  return 0;
132 }