power: reset: Add Axxia system reset driver

Add Axxia (AXM55xx) SoC system reset driver. This driver handles only system
reboot (and not power-off).

Signed-off-by: Anders Berg <anders.berg@lsi.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

4 files changed, 117 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/power_supply/axxia-reset.txt b/Documentation/devicetree/bindings/power_supply/axxia-reset.txt
new file mode 100644
index 000000000000..47e720d249d2
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/axxia-reset.txt
@@ -0,0 +1,20 @@
+Axxia Restart Driver
+
+This driver can do reset of the Axxia SoC. It uses the registers in the syscon
+block to initiate a chip reset.
+
+Required Properties:
+  -compatible: "lsi,axm55xx-reset"
+  -syscon: phandle to the syscon node.
+
+Example:
+
+        syscon: syscon@2010030000 {
+                compatible = "lsi,axxia-syscon", "syscon";
+                reg = <0x20 0x10030000 0 0x2000>;
+        };
+
+        reset: reset@2010031000 {
+                compatible = "lsi,axm55xx-reset";
+                syscon = <&syscon>;
+        };
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index fa0e4e057b99..49b46e6ca959 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -12,6 +12,14 @@ config POWER_RESET_AS3722
         help
           This driver supports turning off board via a ams AS3722 power-off.
 
+config POWER_RESET_AXXIA
+        bool "LSI Axxia reset driver"
+        depends on POWER_RESET && ARCH_AXXIA
+        help
+          This driver supports restart for Axxia SoC.
+
+          Say Y if you have an Axxia family SoC.
+
 config POWER_RESET_GPIO
         bool "GPIO power-off driver"
         depends on OF_GPIO && POWER_RESET
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index a5b4a77d1a41..16c0516e5a19 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
+obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
 obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
diff --git a/drivers/power/reset/axxia-reset.c b/drivers/power/reset/axxia-reset.c
new file mode 100644
index 000000000000..3b1f8d601784
--- /dev/null
+++ b/drivers/power/reset/axxia-reset.c
@@ -0,0 +1,88 @@
+/*
+ * Reset driver for Axxia devices
+ *
+ * Copyright (C) 2014 LSI
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+#include <asm/system_misc.h>
+
+
+#define SC_CRIT_WRITE_KEY       0x1000
+#define SC_LATCH_ON_RESET       0x1004
+#define SC_RESET_CONTROL        0x1008
+#define   RSTCTL_RST_ZERO       (1<<3)
+#define   RSTCTL_RST_FAB        (1<<2)
+#define   RSTCTL_RST_CHIP       (1<<1)
+#define   RSTCTL_RST_SYS        (1<<0)
+#define SC_EFUSE_INT_STATUS     0x180c
+#define   EFUSE_READ_DONE       (1<<31)
+
+static struct regmap *syscon;
+
+static void do_axxia_restart(enum reboot_mode reboot_mode, const char *cmd)
+{
+        /* Access Key (0xab) */
+        regmap_write(syscon, SC_CRIT_WRITE_KEY, 0xab);
+        /* Select internal boot from 0xffff0000 */
+        regmap_write(syscon, SC_LATCH_ON_RESET, 0x00000040);
+        /* Assert ResetReadDone (to avoid hanging in boot ROM) */
+        regmap_write(syscon, SC_EFUSE_INT_STATUS, EFUSE_READ_DONE);
+        /* Assert chip reset */
+        regmap_update_bits(syscon, SC_RESET_CONTROL,
+                           RSTCTL_RST_CHIP, RSTCTL_RST_CHIP);
+}
+
+static int axxia_reset_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+
+        syscon = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
+        if (IS_ERR(syscon)) {
+                pr_err("%s: syscon lookup failed\n", dev->of_node->name);
+                return PTR_ERR(syscon);
+        }
+
+        arm_pm_restart = do_axxia_restart;
+
+        return 0;
+}
+
+static const struct of_device_id of_axxia_reset_match[] = {
+        { .compatible = "lsi,axm55xx-reset", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, of_axxia_reset_match);
+
+static struct platform_driver axxia_reset_driver = {
+        .probe = axxia_reset_probe,
+        .driver = {
+                .name = "axxia-reset",
+                .of_match_table = of_match_ptr(of_axxia_reset_match),
+        },
+};
+
+static int __init axxia_reset_init(void)
+{
+        return platform_driver_register(&axxia_reset_driver);
+}
+device_initcall(axxia_reset_init);