From: Simon Horman <horms+rene...@verge.net.au>
Boot mode register driver for R-Car.
If running on a supported platform it reads the boot mode register and
records it using the boot mode register infrastructure established by an
earlier patch.
rcar_init_boot_mode() is exported allow it to be explicitly called in
cases where the boot mode register is needed before init calls are made.
Signed-off-by: Simon Horman <horms+rene...@verge.net.au>
---
drivers/misc/boot-mode-reg/Kconfig | 8 +++++
drivers/misc/boot-mode-reg/Makefile | 1 +
drivers/misc/boot-mode-reg/rcar.c | 60 +++++++++++++++++++++++++++++++++++++
include/misc/boot-mode-reg.h | 3 ++
4 files changed, 72 insertions(+)
create mode 100644 drivers/misc/boot-mode-reg/rcar.c
diff --git a/drivers/misc/boot-mode-reg/Kconfig
b/drivers/misc/boot-mode-reg/Kconfig
index 3c4ddde..3868c36 100644
--- a/drivers/misc/boot-mode-reg/Kconfig
+++ b/drivers/misc/boot-mode-reg/Kconfig
@@ -9,3 +9,11 @@ config BOOT_MODE_REG_CORE
help
Say Y here to allow support for drivers to read boot mode
registers and make the value available to other subsystems.
+
+config BOOT_MODE_REG_RCAR
+ tristate "Boot Mode Register Driver for Renesas R-Car SoCs"
+ default n
+ select BOOT_MODE_REG_CORE
+ help
+ Say Y here to allow support for reading the boot mode register
+ on Renesas R-Car SoCs.
diff --git a/drivers/misc/boot-mode-reg/Makefile
b/drivers/misc/boot-mode-reg/Makefile
index 19134b2..5469a1d 100644
--- a/drivers/misc/boot-mode-reg/Makefile
+++ b/drivers/misc/boot-mode-reg/Makefile
@@ -4,3 +4,4 @@
#
obj-$(CONFIG_BOOT_MODE_REG_CORE) += core.o
+obj-$(CONFIG_BOOT_MODE_REG_RCAR) += rcar.o
diff --git a/drivers/misc/boot-mode-reg/rcar.c
b/drivers/misc/boot-mode-reg/rcar.c
new file mode 100644
index 0000000..c3b778fe
--- /dev/null
+++ b/drivers/misc/boot-mode-reg/rcar.c
@@ -0,0 +1,60 @@
+/*
+ * R-Car Boot Mode Register Driver
+ *
+ * Copyright (C) 2015 Simon Horman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <misc/boot-mode-reg.h>
+
+#define MODEMR 0xe6160060
+
+static int __init rcar_read_mode_pins(void)
+{
+ void __iomem *modemr;
+ int err = -ENOMEM;
+ static u32 mode;
+
+ modemr = ioremap_nocache(MODEMR, 4);
+ if (!modemr) {
+ pr_err("failed to map boot mode register");
+ goto err;
+ }
+ mode = ioread32(modemr);
+ iounmap(modemr);
+
+ err = boot_mode_reg_set(mode);
+err:
+ if (err)
+ pr_err("failed to initialise boot mode");
+ return err;
+}
+
+int __init rcar_init_boot_mode(void)
+{
+ if (of_machine_is_compatible("renesas,r8a7790") ||
+ of_machine_is_compatible("renesas,r8a7791") ||
+ of_machine_is_compatible("renesas,r8a7792") ||
+ of_machine_is_compatible("renesas,r8a7793") ||
+ of_machine_is_compatible("renesas,r8a7794"))
+ return rcar_read_mode_pins();
+
+ return 0;
+}
+early_initcall(rcar_init_boot_mode);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Simon Horman <ho...@verge.net.au>");
+MODULE_DESCRIPTION("R-Car Boot Mode Register Driver");
diff --git a/include/misc/boot-mode-reg.h b/include/misc/boot-mode-reg.h
index 34ee653..35d7f57 100644
--- a/include/misc/boot-mode-reg.h
+++ b/include/misc/boot-mode-reg.h
@@ -21,4 +21,7 @@
int boot_mode_reg_get(u32 *mode);
int boot_mode_reg_set(u32 mode);
+/* Allow explicit initialisation before initcalls */
+int rcar_init_boot_mode(void);
+
#endif
--
2.8.0
