Exynos SoCs have Chipid IP, for identification of product IDs
and SoC revistions. Till now we are using static macros
such as soc_is_exynos and #ifdefs for run time identification
of SoCs and their revisions. This is leading to add new Kconfig,
soc_is_exynos definitions each time new SoC support is getting
added. So this driver intends to provide initialization code
all these functionalites and thus helping in removing macros.
CC: Arnd Bergmann a...@arndb.de
CC: Greg Kroah-Hartman gre...@linuxfoundation.org
Signed-off-by: Pankaj Dubey pankaj.du...@samsung.com
---
drivers/misc/Kconfig |7
drivers/misc/Makefile|1 +
drivers/misc/exynos-chipid.c | 83 ++
include/linux/exynos-soc.h | 46 +++
4 files changed, 137 insertions(+)
create mode 100644 drivers/misc/exynos-chipid.c
create mode 100644 include/linux/exynos-soc.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 1cb7408..f313bd3 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -515,6 +515,13 @@ config SRAM
the genalloc API. It is supposed to be used for small on-chip SRAM
areas found on many SoCs.
+config EXYNOS_CHIPID
+ tristate Support Exynos CHIPID
+ default y
+ depends on ARCH_EXYNOS || ARM64
+ help
+ If you say Y here you get support for the Exynos CHIP id.
+
source drivers/misc/c2port/Kconfig
source drivers/misc/eeprom/Kconfig
source drivers/misc/cb710/Kconfig
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 7eb4b69..48c8fb5 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -55,3 +55,4 @@ obj-$(CONFIG_SRAM)+= sram.o
obj-y += mic/
obj-$(CONFIG_GENWQE) += genwqe/
obj-$(CONFIG_ECHO) += echo/
+obj-$(CONFIG_EXYNOS_CHIPID)+= exynos-chipid.o
diff --git a/drivers/misc/exynos-chipid.c b/drivers/misc/exynos-chipid.c
new file mode 100644
index 000..eb23339
--- /dev/null
+++ b/drivers/misc/exynos-chipid.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * EXYNOS - CHIP ID support
+ * Author: Pankaj Dubey pankaj.du...@samsung.com
+ *
+ * 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/io.h
+#include linux/of.h
+#include linux/of_address.h
+#include linux/exynos-soc.h
+
+#define EXYNOS4_SOC_MASK 0xFFFE0
+#define EXYNOS5_SOC_MASK 0xF
+
+#define PROD_ID_SHIFT (12)
+
+static void __iomem*exynos_chipid_base;
+unsigned int exynos_soc_id = EXYNOS_SOC_UNKNOWN;
+unsigned int exynos_soc_rev;
+
+struct exynos_chipid_data {
+ unsigned int product_id_mask;
+ unsigned int product_id_shift;
+};
+
+static struct exynos_chipid_data exynos4_chipid_data = {
+ .product_id_mask= EXYNOS4_SOC_MASK,
+ .product_id_shift = PROD_ID_SHIFT,
+};
+
+static struct exynos_chipid_data exynos5_chipid_data = {
+ .product_id_mask= EXYNOS5_SOC_MASK,
+ .product_id_shift = PROD_ID_SHIFT,
+};
+
+static struct of_device_id of_exynos_chipid_ids[] = {
+ {
+ .compatible = samsung,exynos4-chipid,
+ .data = (void *)exynos4_chipid_data,
+ },
+ {
+ .compatible = samsung,exynos5-chipid,
+ .data = (void *)exynos5_chipid_data,
+ },
+ {},
+};
+
+/**
+ * early_exynos_chipid_init - Early chipid initialization
+ */
+void __init early_exynos_chipid_init(void)
+{
+ struct device_node *np = NULL;
+ const struct of_device_id *match;
+ struct exynos_chipid_data *chipid_data;
+ int pro_id;
+
+ if (!exynos_chipid_base) {
+ np = of_find_matching_node_and_match(NULL,
+ of_exynos_chipid_ids, match);
+ if (!np)
+ panic(%s, failed to find chipid node\n, __func__);
+
+ chipid_data = (struct exynos_chipid_data *) match-data;
+ exynos_chipid_base = of_iomap(np, 0);
+
+ if (!exynos_chipid_base)
+ panic(%s: failed to map registers\n, __func__);
+
+ pro_id = __raw_readl(exynos_chipid_base);
+ exynos_soc_id = (pro_id chipid_data-product_id_shift)
+chipid_data-product_id_mask;
+ exynos_soc_rev = pro_id 0xFF;
+ pr_info(Exynos: CPUID[0x%x] CPU_REV[0x%x] Detected\n,
+ exynos_soc_id, exynos_soc_rev);
+ }
+}
diff --git a/include/linux/exynos-soc.h b/include/linux/exynos-soc.h
new file mode 100644
index 000..cb3ae06
--- /dev/null
+++ b/include/linux/exynos-soc.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
