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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 - 2016 Xilinx, Inc.
+ * Copyright (C) 2017 National Instruments Corp
+ * Written by Michal Simek
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+
+#include <asm-generic/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum pca_type {
+	PCA9543,
+	PCA9544,
+	PCA9547,
+	PCA9548,
+	PCA9646
+};
+
+struct chip_desc {
+	u8 enable; /* Enable mask in ctl register (used for muxes only) */
+	enum muxtype {
+		pca954x_ismux = 0,
+		pca954x_isswi,
+	} muxtype;
+	u32 width;
+};
+
+struct pca954x_priv {
+	u32 addr; /* I2C mux address */
+	u32 width; /* I2C mux width - number of busses */
+	struct gpio_desc gpio_mux_reset;
+};
+
+static const struct chip_desc chips[] = {
+	[PCA9543] = {
+		.muxtype = pca954x_isswi,
+		.width = 2,
+	},
+	[PCA9544] = {
+		.enable = 0x4,
+		.muxtype = pca954x_ismux,
+		.width = 4,
+	},
+	[PCA9547] = {
+		.enable = 0x8,
+		.muxtype = pca954x_ismux,
+		.width = 8,
+	},
+	[PCA9548] = {
+		.muxtype = pca954x_isswi,
+		.width = 8,
+	},
+	[PCA9646] = {
+		.muxtype = pca954x_isswi,
+		.width = 4,
+	},
+};
+
+static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
+			    uint channel)
+{
+	struct pca954x_priv *priv = dev_get_priv(mux);
+	uchar byte = 0;
+
+	return dm_i2c_write(mux, priv->addr, &byte, 1);
+}
+
+static int pca954x_select(struct udevice *mux, struct udevice *bus,
+			  uint channel)
+{
+	struct pca954x_priv *priv = dev_get_priv(mux);
+	const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
+	uchar byte;
+
+	if (chip->muxtype == pca954x_ismux)
+		byte = channel | chip->enable;
+	else
+		byte = 1 << channel;
+
+	return dm_i2c_write(mux, priv->addr, &byte, 1);
+}
+
+static const struct i2c_mux_ops pca954x_ops = {
+	.select = pca954x_select,
+	.deselect = pca954x_deselect,
+};
+
+static const struct udevice_id pca954x_ids[] = {
+	{ .compatible = "nxp,pca9543", .data = PCA9543 },
+	{ .compatible = "nxp,pca9544", .data = PCA9544 },
+	{ .compatible = "nxp,pca9547", .data = PCA9547 },
+	{ .compatible = "nxp,pca9548", .data = PCA9548 },
+	{ .compatible = "nxp,pca9646", .data = PCA9646 },
+	{ }
+};
+
+static int pca954x_ofdata_to_platdata(struct udevice *dev)
+{
+	struct pca954x_priv *priv = dev_get_priv(dev);
+	const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
+
+	priv->addr = dev_read_u32_default(dev, "reg", 0);
+	if (!priv->addr) {
+		debug("MUX not found\n");
+		return -ENODEV;
+	}
+	priv->width = chip->width;
+
+	if (!priv->width) {
+		debug("No I2C MUX width specified\n");
+		return -EINVAL;
+	}
+
+	debug("Device %s at 0x%x with width %d\n",
+	      dev->name, priv->addr, priv->width);
+
+	return 0;
+}
+
+static int pca954x_probe(struct udevice *dev)
+{
+	if (IS_ENABLED(CONFIG_DM_GPIO)) {
+		struct pca954x_priv *priv = dev_get_priv(dev);
+		int err;
+
+		err = gpio_request_by_name(dev, "reset-gpios", 0,
+				&priv->gpio_mux_reset, GPIOD_IS_OUT);
+
+		/* it's optional so only bail if we get a real error */
+		if (err && (err != -ENOENT))
+			return err;
+
+		/* dm will take care of polarity */
+		if (dm_gpio_is_valid(&priv->gpio_mux_reset))
+			dm_gpio_set_value(&priv->gpio_mux_reset, 0);
+	}
+
+	return 0;
+}
+
+static int pca954x_remove(struct udevice *dev)
+{
+	if (IS_ENABLED(CONFIG_DM_GPIO)) {
+		struct pca954x_priv *priv = dev_get_priv(dev);
+
+		if (dm_gpio_is_valid(&priv->gpio_mux_reset))
+			dm_gpio_free(dev, &priv->gpio_mux_reset);
+	}
+
+	return 0;
+}
+
+U_BOOT_DRIVER(pca954x) = {
+	.name = "pca954x",
+	.id = UCLASS_I2C_MUX,
+	.of_match = pca954x_ids,
+	.probe = pca954x_probe,
+	.remove = pca954x_remove,
+	.ops = &pca954x_ops,
+	.ofdata_to_platdata = pca954x_ofdata_to_platdata,
+	.priv_auto_alloc_size = sizeof(struct pca954x_priv),
+};