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

source/bootloader/u-boot-2020.01/arch/arm/cpu/armv7/stv0991/clock.c

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2014, STMicroelectronics - All Rights Reserved
+ * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
+ */
+
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/stv0991_cgu.h>
+#include<asm/arch/stv0991_periph.h>
+
+static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
+				(struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
+
+void enable_pll1(void)
+{
+	/* pll1 already configured for 1000Mhz, just need to enable it */
+	writel(readl(&stv0991_cgu_regs->pll1_ctrl) & ~(0x01),
+			&stv0991_cgu_regs->pll1_ctrl);
+}
+
+void clock_setup(int peripheral)
+{
+	switch (peripheral) {
+	case UART_CLOCK_CFG:
+		writel(UART_CLK_CFG, &stv0991_cgu_regs->uart_freq);
+		break;
+	case ETH_CLOCK_CFG:
+		enable_pll1();
+		writel(ETH_CLK_CFG, &stv0991_cgu_regs->eth_freq);
+
+		/* Clock selection for ethernet tx_clk & rx_clk*/
+		writel((readl(&stv0991_cgu_regs->eth_ctrl) & ETH_CLK_MASK)
+				| ETH_CLK_CTRL, &stv0991_cgu_regs->eth_ctrl);
+		break;
+	case QSPI_CLOCK_CFG:
+		writel(QSPI_CLK_CTRL, &stv0991_cgu_regs->qspi_freq);
+		break;
+	default:
+		break;
+	}
+}