soc: samsung: chipid: Add ABB register region read helper

This patch adds helper functions for accessing the ABB block
registers needed by the ASV driver.

Change-Id: Ida2ea622136c1abea2caffaee00b5400a8efba7d
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

diff --git a/drivers/soc/samsung/exynos-chipid.c b/drivers/soc/samsung/exynos-chipid.c
index 17d06d2..ce919cf 100644 (file)
--- a/drivers/soc/samsung/exynos-chipid.c
+++ b/drivers/soc/samsung/exynos-chipid.c
@@ -37,6 +37,7 @@ static const struct exynos_soc_id {
        { "EXYNOS5433", 0xE5433000 },
 };
 
+static void __iomem *exynos_abb_base;
 static void __iomem *exynos_chipid_base;
 
 unsigned int exynos_chipid_read(unsigned int offset)
@@ -50,6 +51,14 @@ unsigned int exynos_chipid_read_bits(unsigned int offset, unsigned int shift,
        return (readl_relaxed(exynos_chipid_base + offset) >> shift) & mask;
 }
 
+unsigned int exynos_chipid_abb_read(unsigned int offset)
+{
+       if (WARN_ON(exynos_abb_base == NULL))
+               return 0;
+
+       return readl_relaxed(exynos_abb_base + offset);
+}
+
 static const char * __init product_id_to_soc_id(unsigned int product_id)
 {
        int i;
@@ -75,13 +84,22 @@ int __init exynos_chipid_early_init(void)
                return -ENODEV;
 
        exynos_chipid_base = of_iomap(np, 0);
-       of_node_put(np);
-
        if (!exynos_chipid_base) {
-               pr_err("Failed to map SoC chipid\n");
+               of_node_put(np);
+               pr_err("Failed to map SoC CHIPID\n");
                return -ENXIO;
        }
 
+       if (of_device_is_compatible(np, "samsung,exynos5433-chipid")) {
+               exynos_abb_base = of_iomap(np, 1);
+               if (!exynos_abb_base) {
+                       of_node_put(np);
+                       pr_err("Failed to map SoC CHIPID/ABB\n");
+                       return -ENXIO;
+               }
+       }
+       of_node_put(np);
+
        product_id = exynos_chipid_read(EXYNOS_CHIPID_REG_PRO_ID);
        revision = product_id & EXYNOS_REV_MASK;
 

diff --git a/drivers/soc/samsung/exynos-chipid.h b/drivers/soc/samsung/exynos-chipid.h
index 7545281..92e854e 100644 (file)
--- a/drivers/soc/samsung/exynos-chipid.h
+++ b/drivers/soc/samsung/exynos-chipid.h
@@ -48,3 +48,4 @@
 unsigned int exynos_chipid_read(unsigned int offset);
 unsigned int exynos_chipid_read_bits(unsigned int offset, unsigned int shift,
                                        unsigned int mask);
+unsigned int exynos_chipid_abb_read(unsigned int offset);