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

source/bootloader/u-boot-2020.01/arch/arm/mach-sunxi/clock.c

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2007-2012
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ *
+ * (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/prcm.h>
+#include <asm/arch/gtbus.h>
+#include <asm/arch/sys_proto.h>
+
+__weak void clock_init_sec(void)
+{
+}
+
+__weak void gtbus_init(void)
+{
+}
+
+int clock_init(void)
+{
+#ifdef CONFIG_SPL_BUILD
+	clock_init_safe();
+	gtbus_init();
+#endif
+	clock_init_uart();
+	clock_init_sec();
+
+	return 0;
+}
+
+/* These functions are shared between various SoCs so put them here. */
+#if defined CONFIG_SUNXI_GEN_SUN6I && !defined CONFIG_MACH_SUN9I
+int clock_twi_onoff(int port, int state)
+{
+	struct sunxi_ccm_reg *const ccm =
+		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+
+	if (port == 5) {
+		if (state)
+			prcm_apb0_enable(
+				PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
+		else
+			prcm_apb0_disable(
+				PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_I2C);
+		return 0;
+	}
+
+	/* set the apb clock gate and reset for twi */
+	if (state) {
+		setbits_le32(&ccm->apb2_gate,
+			     CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT + port));
+		setbits_le32(&ccm->apb2_reset_cfg,
+			     1 << (APB2_RESET_TWI_SHIFT + port));
+	} else {
+		clrbits_le32(&ccm->apb2_reset_cfg,
+			     1 << (APB2_RESET_TWI_SHIFT + port));
+		clrbits_le32(&ccm->apb2_gate,
+			     CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT + port));
+	}
+
+	return 0;
+}
+#endif