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

source/bootloader/u-boot-2020.01/arch/arm/mach-omap2/omap3/am35x_musb.c

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * This file configures the internal USB PHY in AM35X.
+ *
+ * Copyright (C) 2012 Ilya Yanok <ilya.yanok@gmail.com>
+ *
+ * Based on omap_phy_internal.c code from Linux by
+ * Hema HK <hemahk@ti.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/am35x_def.h>
+
+void am35x_musb_reset(struct udevice *dev)
+{
+	/* Reset the musb interface */
+	clrsetbits_le32(&am35x_scm_general_regs->ip_sw_reset,
+			0, USBOTGSS_SW_RST);
+	clrsetbits_le32(&am35x_scm_general_regs->ip_sw_reset,
+			USBOTGSS_SW_RST, 0);
+}
+
+void am35x_musb_phy_power(struct udevice *dev, u8 on)
+{
+	unsigned long start = get_timer(0);
+
+	if (on) {
+		/*
+		 * Start the on-chip PHY and its PLL.
+		 */
+		clrsetbits_le32(&am35x_scm_general_regs->devconf2,
+				CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN,
+				CONF2_PHY_PLLON);
+
+		debug("Waiting for PHY clock good...\n");
+		while (!(readl(&am35x_scm_general_regs->devconf2)
+				& CONF2_PHYCLKGD)) {
+
+			if (get_timer(start) > CONFIG_SYS_HZ / 10) {
+				printf("musb PHY clock good timed out\n");
+				break;
+			}
+		}
+	} else {
+		/*
+		 * Power down the on-chip PHY.
+		 */
+		clrsetbits_le32(&am35x_scm_general_regs->devconf2,
+				CONF2_PHY_PLLON,
+				CONF2_PHYPWRDN | CONF2_OTGPWRDN);
+	}
+}
+
+void am35x_musb_clear_irq(struct udevice *dev)
+{
+	clrsetbits_le32(&am35x_scm_general_regs->lvl_intr_clr,
+			0, USBOTGSS_INT_CLR);
+	readl(&am35x_scm_general_regs->lvl_intr_clr);
+}