Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / power / reset / arm-versatile-reboot.c

diff --git a/kernel/drivers/power/reset/arm-versatile-reboot.c b/kernel/drivers/power/reset/arm-versatile-reboot.c
new file mode 100644 (file)
index 0000000..b208073
--- /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);