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) 2016, NVIDIA CORPORATION.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <misc.h>
+#include <asm/arch-tegra/bpmp_abi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct tegra186_bpmp_i2c {
+	uint32_t bpmp_bus_id;
+};
+
+static inline void serialize_u16(uint8_t **p, uint16_t val)
+{
+	(*p)[0] = val & 0xff;
+	(*p)[1] = val >> 8;
+	(*p) += 2;
+}
+
+/* These just happen to have the same values as I2C_M_* and SERIALI2C_* */
+#define SUPPORTED_FLAGS \
+	(I2C_M_TEN | \
+	I2C_M_RD | \
+	I2C_M_STOP | \
+	I2C_M_NOSTART | \
+	I2C_M_REV_DIR_ADDR | \
+	I2C_M_IGNORE_NAK | \
+	I2C_M_NO_RD_ACK | \
+	I2C_M_RECV_LEN)
+
+static int tegra186_bpmp_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
+				  int nmsgs)
+{
+	struct tegra186_bpmp_i2c *priv = dev_get_priv(dev);
+	struct mrq_i2c_request req;
+	struct mrq_i2c_response resp;
+	uint8_t *p;
+	int left, i, ret;
+
+	req.cmd = CMD_I2C_XFER;
+	req.xfer.bus_id = priv->bpmp_bus_id;
+	p = &req.xfer.data_buf[0];
+	left = ARRAY_SIZE(req.xfer.data_buf);
+	for (i = 0; i < nmsgs; i++) {
+		int len = 6;
+		if (!(msg[i].flags & I2C_M_RD))
+			len += msg[i].len;
+		if ((len >= BIT(16)) || (len > left))
+			return -ENOSPC;
+
+		if (msg[i].flags & ~SUPPORTED_FLAGS)
+			return -EINVAL;
+
+		serialize_u16(&p, msg[i].addr);
+		serialize_u16(&p, msg[i].flags);
+		serialize_u16(&p, msg[i].len);
+		if (!(msg[i].flags & I2C_M_RD)) {
+			memcpy(p, msg[i].buf, msg[i].len);
+			p += msg[i].len;
+		}
+	}
+	req.xfer.data_size = p - &req.xfer.data_buf[0];
+
+	ret = misc_call(dev->parent, MRQ_I2C, &req, sizeof(req), &resp,
+			sizeof(resp));
+	if (ret < 0)
+		return ret;
+
+	p = &resp.xfer.data_buf[0];
+	left = resp.xfer.data_size;
+	if (left > ARRAY_SIZE(resp.xfer.data_buf))
+		return -EINVAL;
+	for (i = 0; i < nmsgs; i++) {
+		if (msg[i].flags & I2C_M_RD) {
+			memcpy(msg[i].buf, p, msg[i].len);
+			p += msg[i].len;
+		}
+	}
+
+	return 0;
+}
+
+static int tegra186_bpmp_probe_chip(struct udevice *bus, uint chip_addr,
+				    uint chip_flags)
+{
+	return 0;
+}
+
+static int tegra186_bpmp_i2c_probe(struct udevice *dev)
+{
+	struct tegra186_bpmp_i2c *priv = dev_get_priv(dev);
+
+	priv->bpmp_bus_id = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
+					    "nvidia,bpmp-bus-id", U32_MAX);
+	if (priv->bpmp_bus_id == U32_MAX) {
+		debug("%s: could not parse nvidia,bpmp-bus-id\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct dm_i2c_ops tegra186_bpmp_i2c_ops = {
+	.xfer = tegra186_bpmp_i2c_xfer,
+	.probe_chip = tegra186_bpmp_probe_chip,
+};
+
+static const struct udevice_id tegra186_bpmp_i2c_ids[] = {
+	{ .compatible = "nvidia,tegra186-bpmp-i2c" },
+	{ }
+};
+
+U_BOOT_DRIVER(i2c_gpio) = {
+	.name	= "tegra186_bpmp_i2c",
+	.id	= UCLASS_I2C,
+	.of_match = tegra186_bpmp_i2c_ids,
+	.probe	= tegra186_bpmp_i2c_probe,
+	.priv_auto_alloc_size = sizeof(struct tegra186_bpmp_i2c),
+	.ops	= &tegra186_bpmp_i2c_ops,
+};