209 lines
5.1 KiB
C
209 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Marvell NFC-over-UART driver
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*
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* Copyright (C) 2015, Marvell International Ltd.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/of_gpio.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include "nfcmrvl.h"
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static unsigned int hci_muxed;
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static unsigned int flow_control;
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static unsigned int break_control;
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static int reset_n_io = -EINVAL;
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/*
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* NFCMRVL NCI OPS
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*/
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static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
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struct sk_buff *skb)
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{
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struct nci_uart *nu = priv->drv_data;
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return nu->ops.send(nu, skb);
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}
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static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
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const void *param)
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{
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struct nci_uart *nu = priv->drv_data;
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const struct nfcmrvl_fw_uart_config *config = param;
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nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
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config->flow_control);
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}
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static const struct nfcmrvl_if_ops uart_ops = {
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.nci_open = nfcmrvl_uart_nci_open,
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.nci_close = nfcmrvl_uart_nci_close,
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.nci_send = nfcmrvl_uart_nci_send,
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.nci_update_config = nfcmrvl_uart_nci_update_config
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};
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static int nfcmrvl_uart_parse_dt(struct device_node *node,
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struct nfcmrvl_platform_data *pdata)
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{
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struct device_node *matched_node;
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int ret;
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matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
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if (!matched_node) {
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matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
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if (!matched_node)
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return -ENODEV;
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}
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ret = nfcmrvl_parse_dt(matched_node, pdata);
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if (ret < 0) {
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pr_err("Failed to get generic entries\n");
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of_node_put(matched_node);
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return ret;
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}
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if (of_find_property(matched_node, "flow-control", NULL))
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pdata->flow_control = 1;
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else
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pdata->flow_control = 0;
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if (of_find_property(matched_node, "break-control", NULL))
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pdata->break_control = 1;
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else
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pdata->break_control = 0;
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of_node_put(matched_node);
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return 0;
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}
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/*
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* NCI UART OPS
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*/
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static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
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{
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struct nfcmrvl_private *priv;
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struct nfcmrvl_platform_data config;
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const struct nfcmrvl_platform_data *pdata = NULL;
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struct device *dev = nu->tty->dev;
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/*
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* Platform data cannot be used here since usually it is already used
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* by low level serial driver. We can try to retrieve serial device
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* and check if DT entries were added.
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*/
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if (dev && dev->parent && dev->parent->of_node)
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if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
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pdata = &config;
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if (!pdata) {
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pr_info("No platform data / DT -> fallback to module params\n");
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config.hci_muxed = hci_muxed;
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config.reset_n_io = reset_n_io;
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config.flow_control = flow_control;
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config.break_control = break_control;
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pdata = &config;
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}
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priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
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dev, pdata);
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if (IS_ERR(priv))
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return PTR_ERR(priv);
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priv->support_fw_dnld = true;
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nu->drv_data = priv;
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nu->ndev = priv->ndev;
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return 0;
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}
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static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
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{
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nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
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}
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static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
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{
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return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
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skb);
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}
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static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
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{
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struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
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if (priv->ndev->nfc_dev->fw_download_in_progress)
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return;
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/* Remove BREAK to wake up the NFCC */
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if (priv->config.break_control && nu->tty->ops->break_ctl) {
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nu->tty->ops->break_ctl(nu->tty, 0);
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usleep_range(3000, 5000);
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}
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}
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static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
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{
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struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
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if (priv->ndev->nfc_dev->fw_download_in_progress)
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return;
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/*
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* To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him
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* up. we set BREAK. Once we will be ready to send again we will remove
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* it.
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*/
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if (priv->config.break_control && nu->tty->ops->break_ctl) {
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nu->tty->ops->break_ctl(nu->tty, -1);
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usleep_range(1000, 3000);
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}
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}
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static struct nci_uart nfcmrvl_nci_uart = {
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.owner = THIS_MODULE,
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.name = "nfcmrvl_uart",
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.driver = NCI_UART_DRIVER_MARVELL,
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.ops = {
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.open = nfcmrvl_nci_uart_open,
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.close = nfcmrvl_nci_uart_close,
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.recv = nfcmrvl_nci_uart_recv,
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.tx_start = nfcmrvl_nci_uart_tx_start,
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.tx_done = nfcmrvl_nci_uart_tx_done,
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}
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};
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module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister);
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MODULE_AUTHOR("Marvell International Ltd.");
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MODULE_DESCRIPTION("Marvell NFC-over-UART");
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MODULE_LICENSE("GPL v2");
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module_param(flow_control, uint, 0);
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MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
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module_param(break_control, uint, 0);
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MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
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module_param(hci_muxed, uint, 0);
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MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
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module_param(reset_n_io, int, 0);
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MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");
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