2 * Marvell NFC-over-UART driver
4 * Copyright (C) 2015, Marvell International Ltd.
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available on the worldwide web at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
14 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
15 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
16 * this warranty disclaimer.
19 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/of_gpio.h>
22 #include <net/nfc/nci.h>
23 #include <net/nfc/nci_core.h>
26 static unsigned int hci_muxed;
27 static unsigned int flow_control;
28 static unsigned int break_control;
29 static unsigned int reset_n_io;
35 static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
40 static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
45 static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
48 struct nci_uart *nu = priv->drv_data;
50 return nu->ops.send(nu, skb);
53 static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
56 struct nci_uart *nu = priv->drv_data;
57 const struct nfcmrvl_fw_uart_config *config = param;
59 nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
60 config->flow_control);
63 static struct nfcmrvl_if_ops uart_ops = {
64 .nci_open = nfcmrvl_uart_nci_open,
65 .nci_close = nfcmrvl_uart_nci_close,
66 .nci_send = nfcmrvl_uart_nci_send,
67 .nci_update_config = nfcmrvl_uart_nci_update_config
70 static int nfcmrvl_uart_parse_dt(struct device_node *node,
71 struct nfcmrvl_platform_data *pdata)
73 struct device_node *matched_node;
76 matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
78 matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
83 ret = nfcmrvl_parse_dt(matched_node, pdata);
85 pr_err("Failed to get generic entries\n");
89 if (of_find_property(matched_node, "flow-control", NULL))
90 pdata->flow_control = 1;
92 pdata->flow_control = 0;
94 if (of_find_property(matched_node, "break-control", NULL))
95 pdata->break_control = 1;
97 pdata->break_control = 0;
106 static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
108 struct nfcmrvl_private *priv;
109 struct nfcmrvl_platform_data *pdata = NULL;
110 struct nfcmrvl_platform_data config;
111 struct device *dev = nu->tty->dev;
114 * Platform data cannot be used here since usually it is already used
115 * by low level serial driver. We can try to retrieve serial device
116 * and check if DT entries were added.
119 if (dev && dev->parent && dev->parent->of_node)
120 if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
124 pr_info("No platform data / DT -> fallback to module params\n");
125 config.hci_muxed = hci_muxed;
126 config.reset_n_io = reset_n_io;
127 config.flow_control = flow_control;
128 config.break_control = break_control;
132 priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
135 return PTR_ERR(priv);
137 priv->support_fw_dnld = true;
140 nu->ndev = priv->ndev;
145 static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
147 nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
150 static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
152 return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
156 static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
158 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
160 if (priv->ndev->nfc_dev->fw_download_in_progress)
163 /* Remove BREAK to wake up the NFCC */
164 if (priv->config.break_control && nu->tty->ops->break_ctl) {
165 nu->tty->ops->break_ctl(nu->tty, 0);
166 usleep_range(3000, 5000);
170 static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
172 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
174 if (priv->ndev->nfc_dev->fw_download_in_progress)
178 ** To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him
179 ** up. we set BREAK. Once we will be ready to send again we will remove
182 if (priv->config.break_control && nu->tty->ops->break_ctl) {
183 nu->tty->ops->break_ctl(nu->tty, -1);
184 usleep_range(1000, 3000);
188 static struct nci_uart nfcmrvl_nci_uart = {
189 .owner = THIS_MODULE,
190 .name = "nfcmrvl_uart",
191 .driver = NCI_UART_DRIVER_MARVELL,
193 .open = nfcmrvl_nci_uart_open,
194 .close = nfcmrvl_nci_uart_close,
195 .recv = nfcmrvl_nci_uart_recv,
196 .tx_start = nfcmrvl_nci_uart_tx_start,
197 .tx_done = nfcmrvl_nci_uart_tx_done,
205 static int nfcmrvl_uart_init_module(void)
207 return nci_uart_register(&nfcmrvl_nci_uart);
210 static void nfcmrvl_uart_exit_module(void)
212 nci_uart_unregister(&nfcmrvl_nci_uart);
215 module_init(nfcmrvl_uart_init_module);
216 module_exit(nfcmrvl_uart_exit_module);
218 MODULE_AUTHOR("Marvell International Ltd.");
219 MODULE_DESCRIPTION("Marvell NFC-over-UART");
220 MODULE_LICENSE("GPL v2");
222 module_param(flow_control, uint, 0);
223 MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
225 module_param(break_control, uint, 0);
226 MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
228 module_param(hci_muxed, uint, 0);
229 MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
231 module_param(reset_n_io, uint, 0);
232 MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");