GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/mach-omap2/omap5/abb.c

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Adaptive Body Bias programming sequence for OMAP5 family
+ *
+ * (C) Copyright 2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
+ */
+
+#include <common.h>
+#include <asm/omap_common.h>
+#include <asm/io.h>
+
+/*
+ * Setup LDOVBB for OMAP5.
+ * On OMAP5+ some ABB settings are fused. They are handled
+ * in the following way:
+ *
+ * 1. corresponding EFUSE register contains ABB enable bit
+ *    and VSET value
+ * 2. If ABB enable bit is set to 1, than ABB should be
+ *    enabled, otherwise ABB should be disabled
+ * 3. If ABB is enabled, than VSET value should be copied
+ *    to corresponding MUX control register
+ */
+s8 abb_setup_ldovbb(u32 fuse, u32 ldovbb)
+{
+	u32 vset;
+	u32 fuse_enable_mask = OMAP5_PROD_ABB_FUSE_ENABLE_MASK;
+	u32 fuse_vset_mask = OMAP5_PROD_ABB_FUSE_VSET_MASK;
+
+	if (!is_omap54xx()) {
+		/* DRA7 */
+		fuse_enable_mask = DRA7_ABB_FUSE_ENABLE_MASK;
+		fuse_vset_mask = DRA7_ABB_FUSE_VSET_MASK;
+	}
+	/*
+	 * ABB parameters must be properly fused
+	 * otherwise ABB should be disabled
+	 */
+	vset = readl(fuse);
+	if (!(vset & fuse_enable_mask))
+		return -1;
+
+	/* prepare VSET value for LDOVBB mux register */
+	vset &= fuse_vset_mask;
+	vset >>= ffs(fuse_vset_mask) - 1;
+	vset <<= ffs(OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK) - 1;
+	vset |= OMAP5_ABB_LDOVBBMPU_MUX_CTRL_MASK;
+
+	/* setup LDOVBB using fused value */
+	clrsetbits_le32(ldovbb,  OMAP5_ABB_LDOVBBMPU_VSET_OUT_MASK, vset);
+
+	return 0;
+}