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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>
210 lines
5.1 KiB
C
210 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2017
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*
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* based on the cmd_ioloop driver/command, which is
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*
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* (C) Copyright 2014
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* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
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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 <log.h>
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#include <misc.h>
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#include <regmap.h>
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#include "gdsys_ioep.h"
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/**
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* struct gdsys_ioep_priv - Private data structure for IOEP devices
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* @map: Register map to be used for the device
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* @state: Flag to keep the current status of the RX control (enabled/disabled)
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*/
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struct gdsys_ioep_priv {
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struct regmap *map;
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bool state;
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};
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/**
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* enum last_spec - Convenience enum for read data sanity check
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* @READ_DATA_IS_LAST: The data to be read should be the final data of the
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* current packet
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* @READ_DATA_IS_NOT_LAST: The data to be read should not be the final data of
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* the current packet
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*/
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enum last_spec {
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READ_DATA_IS_LAST,
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READ_DATA_IS_NOT_LAST,
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};
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static int gdsys_ioep_set_receive(struct udevice *dev, bool val)
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{
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struct gdsys_ioep_priv *priv = dev_get_priv(dev);
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u16 state;
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priv->state = !priv->state;
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if (val)
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state = CTRL_PROC_RECEIVE_ENABLE;
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else
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state = ~CTRL_PROC_RECEIVE_ENABLE;
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gdsys_ioep_set(priv->map, tx_control, state);
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if (val) {
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/* Set device address to dummy 1 */
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gdsys_ioep_set(priv->map, device_address, 1);
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}
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return !priv->state;
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}
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static int gdsys_ioep_send(struct udevice *dev, int offset,
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const void *buf, int size)
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{
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struct gdsys_ioep_priv *priv = dev_get_priv(dev);
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int k;
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u16 *p = (u16 *)buf;
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for (k = 0; k < size; ++k)
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gdsys_ioep_set(priv->map, transmit_data, *(p++));
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gdsys_ioep_set(priv->map, tx_control, CTRL_PROC_RECEIVE_ENABLE |
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CTRL_FLUSH_TRANSMIT_BUFFER);
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return 0;
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}
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/**
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* receive_byte_buffer() - Read data from a IOEP device
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* @dev: The IOEP device to read data from
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* @len: The length of the data to read
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* @buffer: The buffer to read the data into
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* @last_spec: Flag to indicate if the data to be read in this call should be
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* the final data of the current packet (i.e. it should be empty
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* after this read)
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*
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* Return: 0 if OK, -ve on error
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*/
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static int receive_byte_buffer(struct udevice *dev, uint len,
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u16 *buffer, enum last_spec last_spec)
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{
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struct gdsys_ioep_priv *priv = dev_get_priv(dev);
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int k;
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int ret = -EIO;
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for (k = 0; k < len; ++k) {
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u16 rx_tx_status;
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gdsys_ioep_get(priv->map, receive_data, buffer++);
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gdsys_ioep_get(priv->map, rx_tx_status, &rx_tx_status);
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/*
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* Sanity check: If the data read should have been the last,
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* but wasn't, something is wrong
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*/
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if (k == (len - 1) && (last_spec == READ_DATA_IS_NOT_LAST ||
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rx_tx_status & STATE_RX_DATA_LAST))
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ret = 0;
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}
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if (ret)
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debug("%s: Error while receiving bufer (err = %d)\n",
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dev->name, ret);
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return ret;
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}
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static int gdsys_ioep_receive(struct udevice *dev, int offset, void *buf,
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int size)
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{
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int ret;
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struct io_generic_packet header;
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u16 *p = (u16 *)buf;
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const int header_words = sizeof(struct io_generic_packet) / sizeof(u16);
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uint len;
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/* Read the packet header */
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ret = receive_byte_buffer(dev, header_words, p, READ_DATA_IS_NOT_LAST);
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if (ret) {
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debug("%s: Failed to read header data (err = %d)\n",
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dev->name, ret);
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return ret;
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}
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memcpy(&header, p, header_words * sizeof(u16));
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p += header_words;
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/* Get payload data length */
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len = (header.packet_length + 1) / sizeof(u16);
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/* Read the packet payload */
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ret = receive_byte_buffer(dev, len, p, READ_DATA_IS_LAST);
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if (ret) {
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debug("%s: Failed to read payload data (err = %d)\n",
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dev->name, ret);
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return ret;
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}
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return 0;
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}
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static int gdsys_ioep_get_and_reset_status(struct udevice *dev, int msgid,
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void *tx_msg, int tx_size,
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void *rx_msg, int rx_size)
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{
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struct gdsys_ioep_priv *priv = dev_get_priv(dev);
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const u16 mask = STATE_RX_DIST_ERR | STATE_RX_LENGTH_ERR |
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STATE_RX_FRAME_CTR_ERR | STATE_RX_FCS_ERR |
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STATE_RX_PACKET_DROPPED | STATE_TX_ERR;
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u16 *status = rx_msg;
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gdsys_ioep_get(priv->map, rx_tx_status, status);
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gdsys_ioep_set(priv->map, rx_tx_status, *status);
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return (*status & mask) ? 1 : 0;
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}
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static const struct misc_ops gdsys_ioep_ops = {
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.set_enabled = gdsys_ioep_set_receive,
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.write = gdsys_ioep_send,
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.read = gdsys_ioep_receive,
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.call = gdsys_ioep_get_and_reset_status,
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};
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static int gdsys_ioep_probe(struct udevice *dev)
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{
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struct gdsys_ioep_priv *priv = dev_get_priv(dev);
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int ret;
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ret = regmap_init_mem(dev_ofnode(dev), &priv->map);
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if (ret) {
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debug("%s: Could not initialize regmap (err = %d)",
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dev->name, ret);
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return ret;
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}
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priv->state = false;
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return 0;
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}
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static const struct udevice_id gdsys_ioep_ids[] = {
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{ .compatible = "gdsys,io-endpoint" },
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{ }
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};
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U_BOOT_DRIVER(gdsys_ioep) = {
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.name = "gdsys_ioep",
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.id = UCLASS_MISC,
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.ops = &gdsys_ioep_ops,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.of_match = gdsys_ioep_ids,
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.probe = gdsys_ioep_probe,
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.priv_auto = sizeof(struct gdsys_ioep_priv),
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};
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