1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Alchemy Development Board example suspend u
4 *
5 * (c) 2008 Manuel Lauss <mano@roarinelk.homel
6 */
7
8 #include <linux/init.h>
9 #include <linux/kobject.h>
10 #include <linux/suspend.h>
11 #include <linux/sysfs.h>
12 #include <asm/mach-au1x00/au1000.h>
13 #include <asm/mach-au1x00/gpio-au1000.h>
14 #include <asm/mach-db1x00/bcsr.h>
15
16 /*
17 * Generic suspend userspace interface for Alc
18 * This code exports a few sysfs nodes under /
19 * can be used by userspace to en/disable all
20 * sources and configure the timeout after whi
21 * is to trigger a wakeup.
22 */
23
24
25 static unsigned long db1x_pm_sleep_secs;
26 static unsigned long db1x_pm_wakemsk;
27 static unsigned long db1x_pm_last_wakesrc;
28
29 static int db1x_pm_enter(suspend_state_t state
30 {
31 unsigned short bcsrs[16];
32 int i, j, hasint;
33
34 /* save CPLD regs */
35 hasint = bcsr_read(BCSR_WHOAMI);
36 hasint = BCSR_WHOAMI_BOARD(hasint) >=
37 j = (hasint) ? BCSR_MASKSET : BCSR_SYS
38
39 for (i = BCSR_STATUS; i <= j; i++)
40 bcsrs[i] = bcsr_read(i);
41
42 /* shut off hexleds */
43 bcsr_write(BCSR_HEXCLEAR, 3);
44
45 /* enable GPIO based wakeup */
46 alchemy_gpio1_input_enable();
47
48 /* clear and setup wake cause and sour
49 alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
50 alchemy_wrsys(0, AU1000_SYS_WAKESRC);
51
52 alchemy_wrsys(db1x_pm_wakemsk, AU1000_
53
54 /* setup 1Hz-timer-based wakeup: wait
55 while (alchemy_rdsys(AU1000_SYS_CNTRCT
56 asm volatile ("nop");
57
58 alchemy_wrsys(alchemy_rdsys(AU1000_SYS
59 AU1000_SYS_TOYMATCH2);
60
61 /* wait for value to really hit the re
62 while (alchemy_rdsys(AU1000_SYS_CNTRCT
63 asm volatile ("nop");
64
65 /* ...and now the sandman can come! */
66 au_sleep();
67
68
69 /* restore CPLD regs */
70 for (i = BCSR_STATUS; i <= BCSR_SYSTEM
71 bcsr_write(i, bcsrs[i]);
72
73 /* restore CPLD int registers */
74 if (hasint) {
75 bcsr_write(BCSR_INTCLR, 0xffff
76 bcsr_write(BCSR_MASKCLR, 0xfff
77 bcsr_write(BCSR_INTSTAT, 0xfff
78 bcsr_write(BCSR_INTSET, bcsrs[
79 bcsr_write(BCSR_MASKSET, bcsrs
80 }
81
82 /* light up hexleds */
83 bcsr_write(BCSR_HEXCLEAR, 0);
84
85 return 0;
86 }
87
88 static int db1x_pm_begin(suspend_state_t state
89 {
90 if (!db1x_pm_wakemsk) {
91 printk(KERN_ERR "db1x: no wake
92 return -EINVAL;
93 }
94
95 return 0;
96 }
97
98 static void db1x_pm_end(void)
99 {
100 /* read and store wakeup source, the c
101 * be able to clear it, WAKEMSK must b
102 */
103 db1x_pm_last_wakesrc = alchemy_rdsys(A
104
105 alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
106 alchemy_wrsys(0, AU1000_SYS_WAKESRC);
107 }
108
109 static const struct platform_suspend_ops db1x_
110 .valid = suspend_valid_only_m
111 .begin = db1x_pm_begin,
112 .enter = db1x_pm_enter,
113 .end = db1x_pm_end,
114 };
115
116 #define ATTRCMP(x) (0 == strcmp(attr->attr.nam
117
118 static ssize_t db1x_pmattr_show(struct kobject
119 struct kobj_at
120 char *buf)
121 {
122 int idx;
123
124 if (ATTRCMP(timer_timeout))
125 return sprintf(buf, "%lu\n", d
126
127 else if (ATTRCMP(timer))
128 return sprintf(buf, "%u\n",
129 !!(db1x_pm_wak
130
131 else if (ATTRCMP(wakesrc))
132 return sprintf(buf, "%lu\n", d
133
134 else if (ATTRCMP(gpio0) || ATTRCMP(gpi
135 ATTRCMP(gpio3) || ATTRCMP(gpi
136 ATTRCMP(gpio6) || ATTRCMP(gpi
137 idx = (attr->attr.name)[4] - '
138 return sprintf(buf, "%d\n",
139 !!(db1x_pm_wakemsk & S
140
141 } else if (ATTRCMP(wakemsk)) {
142 return sprintf(buf, "%08lx\n",
143 }
144
145 return -ENOENT;
146 }
147
148 static ssize_t db1x_pmattr_store(struct kobjec
149 struct kobj_a
150 const char *i
151 size_t bytes)
152 {
153 unsigned long l;
154 int tmp;
155
156 if (ATTRCMP(timer_timeout)) {
157 tmp = kstrtoul(instr, 0, &l);
158 if (tmp)
159 return tmp;
160
161 db1x_pm_sleep_secs = l;
162
163 } else if (ATTRCMP(timer)) {
164 if (instr[0] != '')
165 db1x_pm_wakemsk |= SYS
166 else
167 db1x_pm_wakemsk &= ~SY
168
169 } else if (ATTRCMP(gpio0) || ATTRCMP(g
170 ATTRCMP(gpio3) || ATTRCMP(g
171 ATTRCMP(gpio6) || ATTRCMP(g
172 tmp = (attr->attr.name)[4] - '
173 if (instr[0] != '') {
174 db1x_pm_wakemsk |= SYS
175 } else {
176 db1x_pm_wakemsk &= ~SY
177 }
178
179 } else if (ATTRCMP(wakemsk)) {
180 tmp = kstrtoul(instr, 0, &l);
181 if (tmp)
182 return tmp;
183
184 db1x_pm_wakemsk = l & 0x000000
185
186 } else
187 bytes = -ENOENT;
188
189 return bytes;
190 }
191
192 #define ATTR(x)
193 static struct kobj_attribute x##_attri
194 __ATTR(x, 0664, db1x_pmattr_sh
195 db1x_pmattr_st
196
197 ATTR(gpio0) /* GPIO-based wakeup e
198 ATTR(gpio1)
199 ATTR(gpio2)
200 ATTR(gpio3)
201 ATTR(gpio4)
202 ATTR(gpio5)
203 ATTR(gpio6)
204 ATTR(gpio7)
205 ATTR(timer) /* TOYMATCH2-based wak
206 ATTR(timer_timeout) /* timer-based wakeup
207 ATTR(wakesrc) /* contents of SYS_WAK
208 ATTR(wakemsk) /* direct access to SY
209
210 #define ATTR_LIST(x) & x ## _attribute.attr
211 static struct attribute *db1x_pmattrs[] = {
212 ATTR_LIST(gpio0),
213 ATTR_LIST(gpio1),
214 ATTR_LIST(gpio2),
215 ATTR_LIST(gpio3),
216 ATTR_LIST(gpio4),
217 ATTR_LIST(gpio5),
218 ATTR_LIST(gpio6),
219 ATTR_LIST(gpio7),
220 ATTR_LIST(timer),
221 ATTR_LIST(timer_timeout),
222 ATTR_LIST(wakesrc),
223 ATTR_LIST(wakemsk),
224 NULL, /* terminator */
225 };
226
227 static struct attribute_group db1x_pmattr_grou
228 .name = "db1x",
229 .attrs = db1x_pmattrs,
230 };
231
232 /*
233 * Initialize suspend interface
234 */
235 static int __init pm_init(void)
236 {
237 /* init TOY to tick at 1Hz if not alre
238 * for confirmation since there's plen
239 * the next suspend cycle.
240 */
241 if (alchemy_rdsys(AU1000_SYS_TOYTRIM)
242 alchemy_wrsys(32767, AU1000_SY
243
244 db1x_pm_last_wakesrc = alchemy_rdsys(A
245
246 alchemy_wrsys(0, AU1000_SYS_WAKESRC);
247 alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
248
249 suspend_set_ops(&db1x_pm_ops);
250
251 return sysfs_create_group(power_kobj,
252 }
253
254 late_initcall(pm_init);
255
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