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https://github.com/brain-hackers/u-boot-brain
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6002c75c59
The nvidia,bpmp property is left over from an old BPMP I2C binding, and shouldn't be present. Remove it from the SoC DT file, and update the I2C driver not to parse it; the value wasn't used for anything any more anyway. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <misc.h>
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#include <asm/arch-tegra/bpmp_abi.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct tegra186_bpmp_i2c {
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uint32_t bpmp_bus_id;
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};
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static inline void serialize_u16(uint8_t **p, uint16_t val)
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{
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(*p)[0] = val & 0xff;
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(*p)[1] = val >> 8;
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(*p) += 2;
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}
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/* These just happen to have the same values as I2C_M_* and SERIALI2C_* */
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#define SUPPORTED_FLAGS \
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(I2C_M_TEN | \
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I2C_M_RD | \
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I2C_M_STOP | \
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I2C_M_NOSTART | \
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I2C_M_REV_DIR_ADDR | \
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I2C_M_IGNORE_NAK | \
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I2C_M_NO_RD_ACK | \
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I2C_M_RECV_LEN)
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static int tegra186_bpmp_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
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int nmsgs)
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{
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struct tegra186_bpmp_i2c *priv = dev_get_priv(dev);
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struct mrq_i2c_request req;
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struct mrq_i2c_response resp;
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uint8_t *p;
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int left, i, ret;
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req.cmd = CMD_I2C_XFER;
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req.xfer.bus_id = priv->bpmp_bus_id;
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p = &req.xfer.data_buf[0];
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left = ARRAY_SIZE(req.xfer.data_buf);
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for (i = 0; i < nmsgs; i++) {
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int len = 6;
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if (!(msg[i].flags & I2C_M_RD))
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len += msg[i].len;
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if ((len >= BIT(16)) || (len > left))
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return -ENOSPC;
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if (msg[i].flags & ~SUPPORTED_FLAGS)
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return -EINVAL;
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serialize_u16(&p, msg[i].addr);
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serialize_u16(&p, msg[i].flags);
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serialize_u16(&p, msg[i].len);
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if (!(msg[i].flags & I2C_M_RD)) {
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memcpy(p, msg[i].buf, msg[i].len);
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p += msg[i].len;
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}
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}
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req.xfer.data_size = p - &req.xfer.data_buf[0];
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ret = misc_call(dev->parent, MRQ_I2C, &req, sizeof(req), &resp,
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sizeof(resp));
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if (ret < 0)
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return ret;
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p = &resp.xfer.data_buf[0];
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left = resp.xfer.data_size;
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if (left > ARRAY_SIZE(resp.xfer.data_buf))
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return -EINVAL;
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for (i = 0; i < nmsgs; i++) {
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if (msg[i].flags & I2C_M_RD) {
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memcpy(msg[i].buf, p, msg[i].len);
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p += msg[i].len;
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}
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}
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return 0;
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}
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static int tegra186_bpmp_i2c_probe(struct udevice *dev)
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{
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struct tegra186_bpmp_i2c *priv = dev_get_priv(dev);
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priv->bpmp_bus_id = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
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"nvidia,bpmp-bus-id", U32_MAX);
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if (priv->bpmp_bus_id == U32_MAX) {
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debug("%s: could not parse nvidia,bpmp-bus-id\n", __func__);
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return -ENODEV;
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}
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return 0;
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}
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static const struct dm_i2c_ops tegra186_bpmp_i2c_ops = {
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.xfer = tegra186_bpmp_i2c_xfer,
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};
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static const struct udevice_id tegra186_bpmp_i2c_ids[] = {
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{ .compatible = "nvidia,tegra186-bpmp-i2c" },
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{ }
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};
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U_BOOT_DRIVER(i2c_gpio) = {
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.name = "tegra186_bpmp_i2c",
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.id = UCLASS_I2C,
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.of_match = tegra186_bpmp_i2c_ids,
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.probe = tegra186_bpmp_i2c_probe,
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.priv_auto_alloc_size = sizeof(struct tegra186_bpmp_i2c),
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.ops = &tegra186_bpmp_i2c_ops,
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};
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