[WATCHDOG] ar7_wdt: convert to become a platform driver
This patch converts the ar7_wdt driver to become a platform driver. The AR7 SoC specific identification and base register calculation is performed by the board code, therefore we no longer need to have access to ar7_chip_id. We also remove the reboot notifier code to use the platform shutdown method as Wim suggested. Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>hifive-unleashed-5.1
Florian Fainelli
Wim Van Sebroeck
parent
dcfb748422
commit
64d4062a38
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@ -28,9 +28,8 @@
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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@ -76,24 +75,10 @@ static unsigned expect_close;
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/* XXX currently fixed, allows max margin ~68.72 secs */
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#define prescale_value 0xffff
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/* Offset of the WDT registers */
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static unsigned long ar7_regs_wdt;
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/* Resource of the WDT registers */
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static struct resource *ar7_regs_wdt;
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/* Pointer to the remapped WDT IO space */
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static struct ar7_wdt *ar7_wdt;
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static void ar7_wdt_get_regs(void)
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{
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u16 chip_id = ar7_chip_id();
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switch (chip_id) {
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case AR7_CHIP_7100:
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case AR7_CHIP_7200:
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ar7_regs_wdt = AR7_REGS_WDT;
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break;
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default:
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ar7_regs_wdt = UR8_REGS_WDT;
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break;
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}
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}
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static void ar7_wdt_kick(u32 value)
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{
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@ -202,20 +187,6 @@ static int ar7_wdt_release(struct inode *inode, struct file *file)
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return 0;
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}
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static int ar7_wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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if (code == SYS_HALT || code == SYS_POWER_OFF)
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if (!nowayout)
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ar7_wdt_disable_wdt();
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return NOTIFY_DONE;
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}
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static struct notifier_block ar7_wdt_notifier = {
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.notifier_call = ar7_wdt_notify_sys,
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};
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static ssize_t ar7_wdt_write(struct file *file, const char *data,
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size_t len, loff_t *ppos)
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{
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@ -299,56 +270,85 @@ static struct miscdevice ar7_wdt_miscdev = {
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.fops = &ar7_wdt_fops,
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};
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static int __init ar7_wdt_init(void)
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static int __devinit ar7_wdt_probe(struct platform_device *pdev)
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{
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int rc;
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spin_lock_init(&wdt_lock);
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ar7_wdt_get_regs();
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if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
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LONGNAME)) {
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printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
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return -EBUSY;
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ar7_regs_wdt =
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platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
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if (!ar7_regs_wdt) {
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printk(KERN_ERR DRVNAME ": could not get registers resource\n");
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rc = -ENODEV;
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goto out;
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}
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ar7_wdt = (struct ar7_wdt *)
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ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt));
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if (!request_mem_region(ar7_regs_wdt->start,
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resource_size(ar7_regs_wdt), LONGNAME)) {
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printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
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rc = -EBUSY;
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goto out;
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}
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ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
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if (!ar7_wdt) {
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printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
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rc = -ENXIO;
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goto out;
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}
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ar7_wdt_disable_wdt();
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ar7_wdt_prescale(prescale_value);
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ar7_wdt_update_margin(margin);
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rc = register_reboot_notifier(&ar7_wdt_notifier);
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if (rc) {
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printk(KERN_ERR DRVNAME
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": unable to register reboot notifier\n");
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goto out_alloc;
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}
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rc = misc_register(&ar7_wdt_miscdev);
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if (rc) {
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printk(KERN_ERR DRVNAME ": unable to register misc device\n");
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goto out_register;
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goto out_alloc;
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}
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goto out;
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out_register:
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unregister_reboot_notifier(&ar7_wdt_notifier);
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out_alloc:
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iounmap(ar7_wdt);
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release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
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release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
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out:
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return rc;
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}
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static void __exit ar7_wdt_cleanup(void)
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static int __devexit ar7_wdt_remove(struct platform_device *pdev)
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{
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misc_deregister(&ar7_wdt_miscdev);
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unregister_reboot_notifier(&ar7_wdt_notifier);
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iounmap(ar7_wdt);
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release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
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release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
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return 0;
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}
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static void ar7_wdt_shutdown(struct platform_device *pdev)
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{
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if (!nowayout)
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ar7_wdt_disable_wdt();
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}
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static struct platform_driver ar7_wdt_driver = {
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.probe = ar7_wdt_probe,
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.remove = __devexit_p(ar7_wdt_remove),
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.shutdown = ar7_wdt_shutdown,
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.driver = {
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.owner = THIS_MODULE,
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.name = "ar7_wdt",
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},
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};
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static int __init ar7_wdt_init(void)
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{
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return platform_driver_register(&ar7_wdt_driver);
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}
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static void __exit ar7_wdt_cleanup(void)
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{
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platform_driver_unregister(&ar7_wdt_driver);
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}
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module_init(ar7_wdt_init);
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