ARM: 8262/1: l2c: Add support for overriding prefetch settings

Firmware on certain boards (e.g. ODROID-U3) can leave incorrect L2C prefetch
settings configured in registers leading to crashes if L2C is enabled
without overriding them. This patch introduces bindings to enable
prefetch settings to be specified from DT and necessary support in the
driver.

[mszyprow: rebased onto v3.18-rc1, added error message when prefetch related
 dt property has been provided without any value]

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Nishanth Menon <nm@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 5288153f28b8..01de13809454 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1169,6 +1169,8 @@ static void __init l2c310_of_parse(const struct device_node *np,
         u32 tag[3] = { 0, 0, 0 };
         u32 filter[2] = { 0, 0 };
         u32 assoc;
+        u32 prefetch;
+        u32 val;
         int ret;
 
         of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
@@ -1214,6 +1216,58 @@ static void __init l2c310_of_parse(const struct device_node *np,
                        assoc);
                 break;
         }
+
+        prefetch = l2x0_saved_regs.prefetch_ctrl;
+
+        ret = of_property_read_u32(np, "arm,double-linefill", &val);
+        if (ret == 0) {
+                if (val)
+                        prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF arm,double-linefill property value is missing\n");
+        }
+
+        ret = of_property_read_u32(np, "arm,double-linefill-incr", &val);
+        if (ret == 0) {
+                if (val)
+                        prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_INCR;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF arm,double-linefill-incr property value is missing\n");
+        }
+
+        ret = of_property_read_u32(np, "arm,double-linefill-wrap", &val);
+        if (ret == 0) {
+                if (!val)
+                        prefetch |= L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_DBL_LINEFILL_WRAP;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF arm,double-linefill-wrap property value is missing\n");
+        }
+
+        ret = of_property_read_u32(np, "arm,prefetch-drop", &val);
+        if (ret == 0) {
+                if (val)
+                        prefetch |= L310_PREFETCH_CTRL_PREFETCH_DROP;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_PREFETCH_DROP;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF arm,prefetch-drop property value is missing\n");
+        }
+
+        ret = of_property_read_u32(np, "arm,prefetch-offset", &val);
+        if (ret == 0) {
+                prefetch &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
+                prefetch |= val & L310_PREFETCH_CTRL_OFFSET_MASK;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n");
+        }
+
+        l2x0_saved_regs.prefetch_ctrl = prefetch;
 }
 
 static const struct l2c_init_data of_l2c310_data __initconst = {