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1 | /* linux/arch/arm/mach-s3c2410/usb-simtec.c |
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 | * 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 | |
37 | #include <plat/usb-control.h> |
38 | #include <plat/devs.h> |
39 | |
40 | #include "usb-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]) |
56 | gpio_set_value(S3C2410_GPB(4), 0); |
57 | else |
58 | gpio_set_value(S3C2410_GPB(4), 1); |
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, |
83 | IRQF_DISABLED | IRQF_TRIGGER_RISING | |
84 | IRQF_TRIGGER_FALLING, |
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 | |
107 | int usb_simtec_init(void) |
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__); |
122 | gpio_free(S3C2410_GPB(4)); |
123 | return ret; |
124 | } |
125 | |
126 | /* turn power on */ |
127 | gpio_direction_output(S3C2410_GPB(4), 1); |
128 | gpio_direction_input(S3C2410_GPG(10)); |
129 | |
130 | s3c_ohci_set_platdata(&usb_simtec_info); |
131 | return 0; |
132 | } |
133 |
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