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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/power/reset/arm-versatile-reboot.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/power/reset/arm-versatile-reboot.c')
-rw-r--r--kernel/drivers/power/reset/arm-versatile-reboot.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/kernel/drivers/power/reset/arm-versatile-reboot.c b/kernel/drivers/power/reset/arm-versatile-reboot.c
new file mode 100644
index 000000000..b208073c8
--- /dev/null
+++ b/kernel/drivers/power/reset/arm-versatile-reboot.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/init.h>
+#include <linux/mfd/syscon.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+
+#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
+#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
+#define INTEGRATOR_CM_CTRL_RESET (1 << 3)
+
+#define REALVIEW_SYS_LOCK_OFFSET 0x20
+#define REALVIEW_SYS_RESETCTL_OFFSET 0x40
+
+/* Magic unlocking token used on all Versatile boards */
+#define VERSATILE_LOCK_VAL 0xA05F
+
+/*
+ * We detect the different syscon types from the compatible strings.
+ */
+enum versatile_reboot {
+ INTEGRATOR_REBOOT_CM,
+ REALVIEW_REBOOT_EB,
+ REALVIEW_REBOOT_PB1176,
+ REALVIEW_REBOOT_PB11MP,
+ REALVIEW_REBOOT_PBA8,
+ REALVIEW_REBOOT_PBX,
+};
+
+/* Pointer to the system controller */
+static struct regmap *syscon_regmap;
+static enum versatile_reboot versatile_reboot_type;
+
+static const struct of_device_id versatile_reboot_of_match[] = {
+ {
+ .compatible = "arm,core-module-integrator",
+ .data = (void *)INTEGRATOR_REBOOT_CM
+ },
+ {
+ .compatible = "arm,realview-eb-syscon",
+ .data = (void *)REALVIEW_REBOOT_EB,
+ },
+ {
+ .compatible = "arm,realview-pb1176-syscon",
+ .data = (void *)REALVIEW_REBOOT_PB1176,
+ },
+ {
+ .compatible = "arm,realview-pb11mp-syscon",
+ .data = (void *)REALVIEW_REBOOT_PB11MP,
+ },
+ {
+ .compatible = "arm,realview-pba8-syscon",
+ .data = (void *)REALVIEW_REBOOT_PBA8,
+ },
+ {
+ .compatible = "arm,realview-pbx-syscon",
+ .data = (void *)REALVIEW_REBOOT_PBX,
+ },
+ {},
+};
+
+static int versatile_reboot(struct notifier_block *this, unsigned long mode,
+ void *cmd)
+{
+ /* Unlock the reset register */
+ /* Then hit reset on the different machines */
+ switch (versatile_reboot_type) {
+ case INTEGRATOR_REBOOT_CM:
+ regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
+ VERSATILE_LOCK_VAL);
+ regmap_update_bits(syscon_regmap,
+ INTEGRATOR_HDR_CTRL_OFFSET,
+ INTEGRATOR_CM_CTRL_RESET,
+ INTEGRATOR_CM_CTRL_RESET);
+ break;
+ case REALVIEW_REBOOT_EB:
+ regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET,
+ VERSATILE_LOCK_VAL);
+ regmap_write(syscon_regmap,
+ REALVIEW_SYS_RESETCTL_OFFSET, 0x0008);
+ break;
+ case REALVIEW_REBOOT_PB1176:
+ regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET,
+ VERSATILE_LOCK_VAL);
+ regmap_write(syscon_regmap,
+ REALVIEW_SYS_RESETCTL_OFFSET, 0x0100);
+ break;
+ case REALVIEW_REBOOT_PB11MP:
+ case REALVIEW_REBOOT_PBA8:
+ regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET,
+ VERSATILE_LOCK_VAL);
+ regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET,
+ 0x0000);
+ regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET,
+ 0x0004);
+ break;
+ case REALVIEW_REBOOT_PBX:
+ regmap_write(syscon_regmap, REALVIEW_SYS_LOCK_OFFSET,
+ VERSATILE_LOCK_VAL);
+ regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET,
+ 0x00f0);
+ regmap_write(syscon_regmap, REALVIEW_SYS_RESETCTL_OFFSET,
+ 0x00f4);
+ break;
+ }
+ dsb();
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block versatile_reboot_nb = {
+ .notifier_call = versatile_reboot,
+ .priority = 192,
+};
+
+static int __init versatile_reboot_probe(void)
+{
+ const struct of_device_id *reboot_id;
+ struct device_node *np;
+ int err;
+
+ np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
+ &reboot_id);
+ if (!np)
+ return -ENODEV;
+ versatile_reboot_type = (enum versatile_reboot)reboot_id->data;
+
+ syscon_regmap = syscon_node_to_regmap(np);
+ if (IS_ERR(syscon_regmap))
+ return PTR_ERR(syscon_regmap);
+
+ err = register_restart_handler(&versatile_reboot_nb);
+ if (err)
+ return err;
+
+ pr_info("versatile reboot driver registered\n");
+ return 0;
+}
+device_initcall(versatile_reboot_probe);