1 // SPDX-License-Identifier: GPL-2.0-only
3 * Marvell NFC-over-UART driver
5 * Copyright (C) 2015, Marvell International Ltd.
8 #include <linux/module.h>
9 #include <linux/delay.h>
10 #include <linux/of_gpio.h>
11 #include <net/nfc/nci.h>
12 #include <net/nfc/nci_core.h>
15 static unsigned int hci_muxed;
16 static unsigned int flow_control;
17 static unsigned int break_control;
18 static int reset_n_io = -EINVAL;
24 static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
29 static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
34 static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
37 struct nci_uart *nu = priv->drv_data;
39 return nu->ops.send(nu, skb);
42 static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
45 struct nci_uart *nu = priv->drv_data;
46 const struct nfcmrvl_fw_uart_config *config = param;
48 nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
49 config->flow_control);
52 static const struct nfcmrvl_if_ops uart_ops = {
53 .nci_open = nfcmrvl_uart_nci_open,
54 .nci_close = nfcmrvl_uart_nci_close,
55 .nci_send = nfcmrvl_uart_nci_send,
56 .nci_update_config = nfcmrvl_uart_nci_update_config
59 static int nfcmrvl_uart_parse_dt(struct device_node *node,
60 struct nfcmrvl_platform_data *pdata)
62 struct device_node *matched_node;
65 matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
67 matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
72 ret = nfcmrvl_parse_dt(matched_node, pdata);
74 pr_err("Failed to get generic entries\n");
75 of_node_put(matched_node);
79 if (of_find_property(matched_node, "flow-control", NULL))
80 pdata->flow_control = 1;
82 pdata->flow_control = 0;
84 if (of_find_property(matched_node, "break-control", NULL))
85 pdata->break_control = 1;
87 pdata->break_control = 0;
89 of_node_put(matched_node);
98 static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
100 struct nfcmrvl_private *priv;
101 struct nfcmrvl_platform_data config;
102 const struct nfcmrvl_platform_data *pdata = NULL;
103 struct device *dev = nu->tty->dev;
106 * Platform data cannot be used here since usually it is already used
107 * by low level serial driver. We can try to retrieve serial device
108 * and check if DT entries were added.
111 if (dev && dev->parent && dev->parent->of_node)
112 if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
116 pr_info("No platform data / DT -> fallback to module params\n");
117 config.hci_muxed = hci_muxed;
118 config.reset_n_io = reset_n_io;
119 config.flow_control = flow_control;
120 config.break_control = break_control;
124 priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
127 return PTR_ERR(priv);
129 priv->support_fw_dnld = true;
132 nu->ndev = priv->ndev;
137 static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
139 nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
142 static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
144 return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
148 static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
150 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
152 if (priv->ndev->nfc_dev->fw_download_in_progress)
155 /* Remove BREAK to wake up the NFCC */
156 if (priv->config.break_control && nu->tty->ops->break_ctl) {
157 nu->tty->ops->break_ctl(nu->tty, 0);
158 usleep_range(3000, 5000);
162 static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
164 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
166 if (priv->ndev->nfc_dev->fw_download_in_progress)
170 * To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him
171 * up. we set BREAK. Once we will be ready to send again we will remove
174 if (priv->config.break_control && nu->tty->ops->break_ctl) {
175 nu->tty->ops->break_ctl(nu->tty, -1);
176 usleep_range(1000, 3000);
180 static struct nci_uart nfcmrvl_nci_uart = {
181 .owner = THIS_MODULE,
182 .name = "nfcmrvl_uart",
183 .driver = NCI_UART_DRIVER_MARVELL,
185 .open = nfcmrvl_nci_uart_open,
186 .close = nfcmrvl_nci_uart_close,
187 .recv = nfcmrvl_nci_uart_recv,
188 .tx_start = nfcmrvl_nci_uart_tx_start,
189 .tx_done = nfcmrvl_nci_uart_tx_done,
192 module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister);
194 MODULE_AUTHOR("Marvell International Ltd.");
195 MODULE_DESCRIPTION("Marvell NFC-over-UART");
196 MODULE_LICENSE("GPL v2");
198 module_param(flow_control, uint, 0);
199 MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
201 module_param(break_control, uint, 0);
202 MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
204 module_param(hci_muxed, uint, 0);
205 MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
207 module_param(reset_n_io, int, 0);
208 MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");