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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <init.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/soc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Information specific to the DB-88F7040 eval board. We strive to use
+ * DT for such platform specfic configurations. At some point, this
+ * might be removed here and implemented via DT.
+ */
+/* IO expander I2C device */
+#define I2C_IO_EXP_ADDR		0x21
+#define I2C_IO_CFG_REG_0	0x6
+#define I2C_IO_DATA_OUT_REG_0	0x2
+/* VBus enable */
+#define I2C_IO_REG_0_USB_H0_OFF	0
+#define I2C_IO_REG_0_USB_H1_OFF	1
+#define I2C_IO_REG_VBUS		((1 << I2C_IO_REG_0_USB_H0_OFF) | \
+				 (1 << I2C_IO_REG_0_USB_H1_OFF))
+/* Current limit */
+#define I2C_IO_REG_0_USB_H0_CL	4
+#define I2C_IO_REG_0_USB_H1_CL	5
+#define I2C_IO_REG_CL		((1 << I2C_IO_REG_0_USB_H0_CL) | \
+				 (1 << I2C_IO_REG_0_USB_H1_CL))
+
+static int usb_enabled = 0;
+
+/* Board specific xHCI dis-/enable code */
+
+/*
+ * Set USB VBUS signals (via I2C IO expander/GPIO) as output and set
+ * output value as disabled
+ *
+ * Set USB Current Limit signals (via I2C IO expander/GPIO) as output
+ * and set output value as enabled
+ */
+int board_xhci_config(void)
+{
+	struct udevice *dev;
+	int ret;
+	u8 buf[8];
+
+	if (of_machine_is_compatible("marvell,armada7040-db")) {
+		/* Configure IO exander PCA9555: 7bit address 0x21 */
+		ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
+		if (ret) {
+			printf("Cannot find PCA9555: %d\n", ret);
+			return 0;
+		}
+
+		/*
+		 * Read configuration (direction) and set VBUS pin as output
+		 * (reset pin = output)
+		 */
+		ret = dm_i2c_read(dev, I2C_IO_CFG_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to read IO expander value via I2C\n");
+			return -EIO;
+		}
+		buf[0] &= ~I2C_IO_REG_VBUS;
+		buf[0] &= ~I2C_IO_REG_CL;
+		ret = dm_i2c_write(dev, I2C_IO_CFG_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to set IO expander via I2C\n");
+			return -EIO;
+		}
+
+		/* Read output value and configure it */
+		ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to read IO expander value via I2C\n");
+			return -EIO;
+		}
+		buf[0] &= ~I2C_IO_REG_VBUS;
+		buf[0] |= I2C_IO_REG_CL;
+		ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to set IO expander via I2C\n");
+			return -EIO;
+		}
+
+		mdelay(500); /* required delay to let output value settle */
+	}
+
+	return 0;
+}
+
+int board_xhci_enable(fdt_addr_t base)
+{
+	struct udevice *dev;
+	int ret;
+	u8 buf[8];
+
+	if (of_machine_is_compatible("marvell,armada7040-db")) {
+		/*
+		 * This function enables all USB ports simultaniously,
+		 * it only needs to get called once
+		 */
+		if (usb_enabled)
+			return 0;
+
+		/* Configure IO exander PCA9555: 7bit address 0x21 */
+		ret = i2c_get_chip_for_busnum(0, I2C_IO_EXP_ADDR, 1, &dev);
+		if (ret) {
+			printf("Cannot find PCA9555: %d\n", ret);
+			return 0;
+		}
+
+		/* Read VBUS output value */
+		ret = dm_i2c_read(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to read IO expander value via I2C\n");
+			return -EIO;
+		}
+
+		/* Enable VBUS power: Set output value of VBUS pin as enabled */
+		buf[0] |= I2C_IO_REG_VBUS;
+		ret = dm_i2c_write(dev, I2C_IO_DATA_OUT_REG_0, buf, 1);
+		if (ret) {
+			printf("Failed to set IO expander via I2C\n");
+			return -EIO;
+		}
+
+		mdelay(500); /* required delay to let output value settle */
+		usb_enabled = 1;
+	}
+
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	/* Nothing to do (yet), perhaps later some pin-muxing etc */
+
+	return 0;
+}
+
+int board_init(void)
+{
+	/* adress of boot parameters */
+	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
+
+	return 0;
+}
+
+int board_late_init(void)
+{
+	/* Pre-configure the USB ports (overcurrent, VBus) */
+	board_xhci_config();
+
+	return 0;
+}