83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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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(dev),
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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 -EINVAL;
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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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