Commit | Line | Data |
---|---|---|
35832e26 MSJ |
1 | /* |
2 | * Sets up interrupt handlers for various hardware switches which are | |
3 | * connected to interrupt lines. | |
4 | * | |
5 | * Copyright 2005-2207 PMC-Sierra, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
13 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
14 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
15 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
16 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
17 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
18 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
19 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
20 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
21 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License along | |
24 | * with this program; if not, write to the Free Software Foundation, Inc., | |
25 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/interrupt.h> | |
31 | ||
32 | #include <msp_int.h> | |
33 | #include <msp_regs.h> | |
34 | #include <msp_regops.h> | |
35832e26 MSJ |
35 | |
36 | /* For hwbutton_interrupt->initial_state */ | |
37 | #define HWBUTTON_HI 0x1 | |
38 | #define HWBUTTON_LO 0x2 | |
39 | ||
40 | /* | |
41 | * This struct describes a hardware button | |
42 | */ | |
43 | struct hwbutton_interrupt { | |
44 | char *name; /* Name of button */ | |
45 | int irq; /* Actual LINUX IRQ */ | |
46 | int eirq; /* Extended IRQ number (0-7) */ | |
47 | int initial_state; /* The "normal" state of the switch */ | |
48 | void (*handle_hi)(void *); /* Handler: switch input has gone HI */ | |
49 | void (*handle_lo)(void *); /* Handler: switch input has gone LO */ | |
50 | void *data; /* Optional data to pass to handler */ | |
51 | }; | |
52 | ||
53 | #ifdef CONFIG_PMC_MSP7120_GW | |
54 | extern void msp_restart(char *); | |
55 | ||
56 | static void softreset_push(void *data) | |
57 | { | |
58 | printk(KERN_WARNING "SOFTRESET switch was pushed\n"); | |
59 | ||
60 | /* | |
61 | * In the future you could move this to the release handler, | |
62 | * timing the difference between the 'push' and 'release', and only | |
63 | * doing this ungraceful restart if the button has been down for | |
64 | * a certain amount of time; otherwise doing a graceful restart. | |
65 | */ | |
66 | ||
67 | msp_restart(NULL); | |
68 | } | |
69 | ||
70 | static void softreset_release(void *data) | |
71 | { | |
72 | printk(KERN_WARNING "SOFTRESET switch was released\n"); | |
73 | ||
74 | /* Do nothing */ | |
75 | } | |
76 | ||
77 | static void standby_on(void *data) | |
78 | { | |
79 | printk(KERN_WARNING "STANDBY switch was set to ON (not implemented)\n"); | |
80 | ||
81 | /* TODO: Put board in standby mode */ | |
35832e26 MSJ |
82 | } |
83 | ||
84 | static void standby_off(void *data) | |
85 | { | |
86 | printk(KERN_WARNING | |
87 | "STANDBY switch was set to OFF (not implemented)\n"); | |
88 | ||
89 | /* TODO: Take out of standby mode */ | |
35832e26 MSJ |
90 | } |
91 | ||
92 | static struct hwbutton_interrupt softreset_sw = { | |
93 | .name = "Softreset button", | |
94 | .irq = MSP_INT_EXT0, | |
95 | .eirq = 0, | |
96 | .initial_state = HWBUTTON_HI, | |
97 | .handle_hi = softreset_release, | |
98 | .handle_lo = softreset_push, | |
99 | .data = NULL, | |
100 | }; | |
101 | ||
102 | static struct hwbutton_interrupt standby_sw = { | |
103 | .name = "Standby switch", | |
104 | .irq = MSP_INT_EXT1, | |
105 | .eirq = 1, | |
106 | .initial_state = HWBUTTON_HI, | |
107 | .handle_hi = standby_off, | |
108 | .handle_lo = standby_on, | |
109 | .data = NULL, | |
110 | }; | |
111 | #endif /* CONFIG_PMC_MSP7120_GW */ | |
112 | ||
113 | static irqreturn_t hwbutton_handler(int irq, void *data) | |
114 | { | |
115 | struct hwbutton_interrupt *hirq = data; | |
116 | unsigned long cic_ext = *CIC_EXT_CFG_REG; | |
117 | ||
35832e26 MSJ |
118 | if (CIC_EXT_IS_ACTIVE_HI(cic_ext, hirq->eirq)) { |
119 | /* Interrupt: pin is now HI */ | |
120 | CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq); | |
121 | hirq->handle_hi(hirq->data); | |
122 | } else { | |
123 | /* Interrupt: pin is now LO */ | |
124 | CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq); | |
125 | hirq->handle_lo(hirq->data); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Invert the POLARITY of this level interrupt to ack the interrupt | |
130 | * Thus next state change will invoke the opposite message | |
131 | */ | |
132 | *CIC_EXT_CFG_REG = cic_ext; | |
133 | ||
134 | return IRQ_HANDLED; | |
135 | } | |
136 | ||
137 | static int msp_hwbutton_register(struct hwbutton_interrupt *hirq) | |
138 | { | |
139 | unsigned long cic_ext; | |
140 | ||
141 | if (hirq->handle_hi == NULL || hirq->handle_lo == NULL) | |
142 | return -EINVAL; | |
143 | ||
144 | cic_ext = *CIC_EXT_CFG_REG; | |
145 | CIC_EXT_SET_TRIGGER_LEVEL(cic_ext, hirq->eirq); | |
146 | if (hirq->initial_state == HWBUTTON_HI) | |
147 | CIC_EXT_SET_ACTIVE_LO(cic_ext, hirq->eirq); | |
148 | else | |
149 | CIC_EXT_SET_ACTIVE_HI(cic_ext, hirq->eirq); | |
150 | *CIC_EXT_CFG_REG = cic_ext; | |
151 | ||
8b5690f8 | 152 | return request_irq(hirq->irq, hwbutton_handler, 0, |
1c9e919f | 153 | hirq->name, hirq); |
35832e26 MSJ |
154 | } |
155 | ||
156 | static int __init msp_hwbutton_setup(void) | |
157 | { | |
158 | #ifdef CONFIG_PMC_MSP7120_GW | |
159 | msp_hwbutton_register(&softreset_sw); | |
160 | msp_hwbutton_register(&standby_sw); | |
161 | #endif | |
162 | return 0; | |
163 | } | |
164 | ||
165 | subsys_initcall(msp_hwbutton_setup); |