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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
128 lines
2.8 KiB
C
128 lines
2.8 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 <log.h>
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#include <misc.h>
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#include <asm/arch-tegra/bpmp_abi.h>
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#include <linux/bitops.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_probe_chip(struct udevice *bus, uint chip_addr,
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uint chip_flags)
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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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.probe_chip = tegra186_bpmp_probe_chip,
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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 = sizeof(struct tegra186_bpmp_i2c),
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.ops = &tegra186_bpmp_i2c_ops,
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};
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