255 lines
6.1 KiB
C
Executable file
255 lines
6.1 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* Alchemy Development Board example suspend userspace interface.
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*
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* (c) 2008 Manuel Lauss <mano@roarinelk.homelinux.net>
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*/
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/suspend.h>
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#include <linux/sysfs.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/mach-au1x00/gpio-au1000.h>
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#include <asm/mach-db1x00/bcsr.h>
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/*
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* Generic suspend userspace interface for Alchemy development boards.
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* This code exports a few sysfs nodes under /sys/power/db1x/ which
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* can be used by userspace to en/disable all au1x-provided wakeup
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* sources and configure the timeout after which the the TOYMATCH2 irq
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* is to trigger a wakeup.
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*/
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static unsigned long db1x_pm_sleep_secs;
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static unsigned long db1x_pm_wakemsk;
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static unsigned long db1x_pm_last_wakesrc;
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static int db1x_pm_enter(suspend_state_t state)
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{
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unsigned short bcsrs[16];
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int i, j, hasint;
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/* save CPLD regs */
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hasint = bcsr_read(BCSR_WHOAMI);
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hasint = BCSR_WHOAMI_BOARD(hasint) >= BCSR_WHOAMI_DB1200;
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j = (hasint) ? BCSR_MASKSET : BCSR_SYSTEM;
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for (i = BCSR_STATUS; i <= j; i++)
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bcsrs[i] = bcsr_read(i);
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/* shut off hexleds */
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bcsr_write(BCSR_HEXCLEAR, 3);
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/* enable GPIO based wakeup */
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alchemy_gpio1_input_enable();
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/* clear and setup wake cause and source */
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alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
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alchemy_wrsys(0, AU1000_SYS_WAKESRC);
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alchemy_wrsys(db1x_pm_wakemsk, AU1000_SYS_WAKEMSK);
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/* setup 1Hz-timer-based wakeup: wait for reg access */
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while (alchemy_rdsys(AU1000_SYS_CNTRCTRL) & SYS_CNTRL_M20)
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asm volatile ("nop");
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alchemy_wrsys(alchemy_rdsys(AU1000_SYS_TOYREAD) + db1x_pm_sleep_secs,
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AU1000_SYS_TOYMATCH2);
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/* wait for value to really hit the register */
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while (alchemy_rdsys(AU1000_SYS_CNTRCTRL) & SYS_CNTRL_M20)
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asm volatile ("nop");
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/* ...and now the sandman can come! */
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au_sleep();
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/* restore CPLD regs */
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for (i = BCSR_STATUS; i <= BCSR_SYSTEM; i++)
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bcsr_write(i, bcsrs[i]);
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/* restore CPLD int registers */
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if (hasint) {
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bcsr_write(BCSR_INTCLR, 0xffff);
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bcsr_write(BCSR_MASKCLR, 0xffff);
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bcsr_write(BCSR_INTSTAT, 0xffff);
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bcsr_write(BCSR_INTSET, bcsrs[BCSR_INTSET]);
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bcsr_write(BCSR_MASKSET, bcsrs[BCSR_MASKSET]);
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}
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/* light up hexleds */
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bcsr_write(BCSR_HEXCLEAR, 0);
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return 0;
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}
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static int db1x_pm_begin(suspend_state_t state)
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{
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if (!db1x_pm_wakemsk) {
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printk(KERN_ERR "db1x: no wakeup source activated!\n");
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return -EINVAL;
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}
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return 0;
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}
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static void db1x_pm_end(void)
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{
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/* read and store wakeup source, the clear the register. To
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* be able to clear it, WAKEMSK must be cleared first.
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*/
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db1x_pm_last_wakesrc = alchemy_rdsys(AU1000_SYS_WAKESRC);
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alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
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alchemy_wrsys(0, AU1000_SYS_WAKESRC);
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}
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static const struct platform_suspend_ops db1x_pm_ops = {
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.valid = suspend_valid_only_mem,
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.begin = db1x_pm_begin,
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.enter = db1x_pm_enter,
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.end = db1x_pm_end,
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};
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#define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x))
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static ssize_t db1x_pmattr_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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int idx;
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if (ATTRCMP(timer_timeout))
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return sprintf(buf, "%lu\n", db1x_pm_sleep_secs);
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else if (ATTRCMP(timer))
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return sprintf(buf, "%u\n",
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!!(db1x_pm_wakemsk & SYS_WAKEMSK_M2));
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else if (ATTRCMP(wakesrc))
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return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc);
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else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
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ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
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ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
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idx = (attr->attr.name)[4] - '0';
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return sprintf(buf, "%d\n",
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!!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx)));
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} else if (ATTRCMP(wakemsk)) {
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return sprintf(buf, "%08lx\n", db1x_pm_wakemsk);
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}
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return -ENOENT;
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}
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static ssize_t db1x_pmattr_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *instr,
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size_t bytes)
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{
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unsigned long l;
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int tmp;
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if (ATTRCMP(timer_timeout)) {
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tmp = kstrtoul(instr, 0, &l);
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if (tmp)
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return tmp;
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db1x_pm_sleep_secs = l;
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} else if (ATTRCMP(timer)) {
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if (instr[0] != '0')
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db1x_pm_wakemsk |= SYS_WAKEMSK_M2;
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else
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db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2;
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} else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
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ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
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ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
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tmp = (attr->attr.name)[4] - '0';
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if (instr[0] != '0') {
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db1x_pm_wakemsk |= SYS_WAKEMSK_GPIO(tmp);
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} else {
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db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp);
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}
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} else if (ATTRCMP(wakemsk)) {
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tmp = kstrtoul(instr, 0, &l);
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if (tmp)
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return tmp;
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db1x_pm_wakemsk = l & 0x0000003f;
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} else
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bytes = -ENOENT;
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return bytes;
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}
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#define ATTR(x) \
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static struct kobj_attribute x##_attribute = \
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__ATTR(x, 0664, db1x_pmattr_show, \
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db1x_pmattr_store);
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ATTR(gpio0) /* GPIO-based wakeup enable */
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ATTR(gpio1)
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ATTR(gpio2)
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ATTR(gpio3)
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ATTR(gpio4)
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ATTR(gpio5)
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ATTR(gpio6)
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ATTR(gpio7)
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ATTR(timer) /* TOYMATCH2-based wakeup enable */
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ATTR(timer_timeout) /* timer-based wakeup timeout value, in seconds */
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ATTR(wakesrc) /* contents of SYS_WAKESRC after last wakeup */
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ATTR(wakemsk) /* direct access to SYS_WAKEMSK */
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#define ATTR_LIST(x) & x ## _attribute.attr
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static struct attribute *db1x_pmattrs[] = {
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ATTR_LIST(gpio0),
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ATTR_LIST(gpio1),
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ATTR_LIST(gpio2),
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ATTR_LIST(gpio3),
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ATTR_LIST(gpio4),
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ATTR_LIST(gpio5),
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ATTR_LIST(gpio6),
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ATTR_LIST(gpio7),
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ATTR_LIST(timer),
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ATTR_LIST(timer_timeout),
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ATTR_LIST(wakesrc),
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ATTR_LIST(wakemsk),
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NULL, /* terminator */
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};
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static struct attribute_group db1x_pmattr_group = {
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.name = "db1x",
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.attrs = db1x_pmattrs,
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};
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/*
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* Initialize suspend interface
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*/
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static int __init pm_init(void)
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{
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/* init TOY to tick at 1Hz if not already done. No need to wait
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* for confirmation since there's plenty of time from here to
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* the next suspend cycle.
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*/
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if (alchemy_rdsys(AU1000_SYS_TOYTRIM) != 32767)
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alchemy_wrsys(32767, AU1000_SYS_TOYTRIM);
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db1x_pm_last_wakesrc = alchemy_rdsys(AU1000_SYS_WAKESRC);
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alchemy_wrsys(0, AU1000_SYS_WAKESRC);
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alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
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suspend_set_ops(&db1x_pm_ops);
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return sysfs_create_group(power_kobj, &db1x_pmattr_group);
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}
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late_initcall(pm_init);
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