sunxi: Enable CONFIG_SPL_STACK_R

[u-boot] / arch / arm / mach-mvebu / mbus.c

diff --git a/arch/arm/mach-mvebu/mbus.c b/arch/arm/mach-mvebu/mbus.c
index 9b76bce91d03a11d2a7f5246e5751e2bcea794a4..771cce6fa3b7a381d8400bc196f018fee897439f 100644 (file)
--- a/arch/arm/mach-mvebu/mbus.c
+++ b/arch/arm/mach-mvebu/mbus.c
@@ -52,10 +52,9 @@
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
+#include <linux/compat.h>
 #include <linux/mbus.h>
 
-#define BIT(nr)                        (1UL << (nr))
-
 /* DDR target is the same on all platforms */
 #define TARGET_DDR             0
 
@@ -407,6 +406,53 @@ int mvebu_mbus_del_window(phys_addr_t base, size_t size)
        return 0;
 }
 
+static void mvebu_mbus_get_lowest_base(struct mvebu_mbus_state *mbus,
+                                      phys_addr_t *base)
+{
+       int win;
+       *base = 0xffffffff;
+
+       for (win = 0; win < mbus->soc->num_wins; win++) {
+               u64 wbase;
+               u32 wsize;
+               u8 wtarget, wattr;
+               int enabled;
+
+               mvebu_mbus_read_window(mbus, win,
+                                      &enabled, &wbase, &wsize,
+                                      &wtarget, &wattr, NULL);
+
+               if (!enabled)
+                       continue;
+
+               if (wbase < *base)
+                       *base = wbase;
+       }
+}
+
+static void mvebu_config_mbus_bridge(struct mvebu_mbus_state *mbus)
+{
+       phys_addr_t base;
+       u32 val;
+       u32 size;
+
+       /* Set MBUS bridge base/ctrl */
+       mvebu_mbus_get_lowest_base(&mbus_state, &base);
+
+       size = 0xffffffff - base + 1;
+       if (!is_power_of_2(size)) {
+               /* Round up to next power of 2 */
+               size = 1 << (ffs(base) + 1);
+               base = 0xffffffff - size + 1;
+       }
+
+       /* Now write base and size */
+       writel(base, MBUS_BRIDGE_WIN_BASE_REG);
+       /* Align window size to 64KiB */
+       val = (size / (64 << 10)) - 1;
+       writel((val << 16) | 0x1, MBUS_BRIDGE_WIN_CTRL_REG);
+}
+
 int mbus_dt_setup_win(struct mvebu_mbus_state *mbus,
                      u32 base, u32 size, u8 target, u8 attr)
 {
@@ -426,6 +472,13 @@ int mbus_dt_setup_win(struct mvebu_mbus_state *mbus,
                        return -ENOMEM;
        }
 
+       /*
+        * Re-configure the mbus bridge registers each time this function
+        * is called. Since it may get called from the board code in
+        * later boot stages as well.
+        */
+       mvebu_config_mbus_bridge(mbus);
+
        return 0;
 }