soc/tegra: fuse: Add RAM code reader helper

Needed for the EMC and MC drivers to know what timings from the DT to
use.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index 3bf5aba4caaa..73fad05d8f2c 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -28,8 +28,15 @@
 #define APBMISC_SIZE    0x64
 #define FUSE_SKU_INFO   0x10
 
+#define PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT      4
+#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG  \
+        (0xf << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
+#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \
+        (0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
+
 static void __iomem *apbmisc_base;
 static void __iomem *strapping_base;
+static bool long_ram_code;
 
 u32 tegra_read_chipid(void)
 {
@@ -54,6 +61,18 @@ u32 tegra_read_straps(void)
                 return 0;
 }
 
+u32 tegra_read_ram_code(void)
+{
+        u32 straps = tegra_read_straps();
+
+        if (long_ram_code)
+                straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_LONG;
+        else
+                straps &= PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT;
+
+        return straps >> PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT;
+}
+
 static const struct of_device_id apbmisc_match[] __initconst = {
         { .compatible = "nvidia,tegra20-apbmisc", },
         {},
@@ -112,4 +131,6 @@ void __init tegra_init_apbmisc(void)
         strapping_base = of_iomap(np, 1);
         if (!strapping_base)
                 pr_err("ioremap tegra strapping_base failed\n");
+
+        long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
 }
diff --git a/include/soc/tegra/fuse.h b/include/soc/tegra/fuse.h
index b5f7b5f8d008..b019e3465f11 100644
--- a/include/soc/tegra/fuse.h
+++ b/include/soc/tegra/fuse.h
@@ -56,6 +56,7 @@ struct tegra_sku_info {
 };
 
 u32 tegra_read_straps(void);
+u32 tegra_read_ram_code(void);
 u32 tegra_read_chipid(void);
 int tegra_fuse_readl(unsigned long offset, u32 *value);