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