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[mirror_ubuntu-zesty-kernel.git] / drivers / nfc / nfcmrvl / uart.c
1 /**
2 * Marvell NFC-over-UART driver
3 *
4 * Copyright (C) 2015, Marvell International Ltd.
5 *
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.
12 *
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.
17 */
18
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>
24 #include "nfcmrvl.h"
25
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;
30
31 /*
32 ** NFCMRVL NCI OPS
33 */
34
35 static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
36 {
37 return 0;
38 }
39
40 static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
41 {
42 return 0;
43 }
44
45 static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
46 struct sk_buff *skb)
47 {
48 struct nci_uart *nu = priv->drv_data;
49
50 return nu->ops.send(nu, skb);
51 }
52
53 static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
54 const void *param)
55 {
56 struct nci_uart *nu = priv->drv_data;
57 const struct nfcmrvl_fw_uart_config *config = param;
58
59 nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
60 config->flow_control);
61 }
62
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
68 };
69
70 static int nfcmrvl_uart_parse_dt(struct device_node *node,
71 struct nfcmrvl_platform_data *pdata)
72 {
73 struct device_node *matched_node;
74 int ret;
75
76 matched_node = of_find_compatible_node(node, NULL, "marvell,nfc-uart");
77 if (!matched_node) {
78 matched_node = of_find_compatible_node(node, NULL,
79 "mrvl,nfc-uart");
80 if (!matched_node)
81 return -ENODEV;
82 }
83
84 ret = nfcmrvl_parse_dt(matched_node, pdata);
85 if (ret < 0) {
86 pr_err("Failed to get generic entries\n");
87 return ret;
88 }
89
90 if (of_find_property(matched_node, "flow-control", NULL))
91 pdata->flow_control = 1;
92 else
93 pdata->flow_control = 0;
94
95 if (of_find_property(matched_node, "break-control", NULL))
96 pdata->break_control = 1;
97 else
98 pdata->break_control = 0;
99
100 return 0;
101 }
102
103 /*
104 ** NCI UART OPS
105 */
106
107 static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
108 {
109 struct nfcmrvl_private *priv;
110 struct nfcmrvl_platform_data *pdata = NULL;
111 struct nfcmrvl_platform_data config;
112
113 /*
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.
117 */
118
119 if (nu->tty->dev->parent && nu->tty->dev->parent->of_node)
120 if (nfcmrvl_uart_parse_dt(nu->tty->dev->parent->of_node,
121 &config) == 0)
122 pdata = &config;
123
124 if (!pdata) {
125 pr_info("No platform data / DT -> fallback to module params\n");
126 config.hci_muxed = hci_muxed;
127 config.reset_n_io = reset_n_io;
128 config.flow_control = flow_control;
129 config.break_control = break_control;
130 pdata = &config;
131 }
132
133 priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
134 nu->tty->dev, pdata);
135 if (IS_ERR(priv))
136 return PTR_ERR(priv);
137
138 priv->support_fw_dnld = true;
139
140 nu->drv_data = priv;
141 nu->ndev = priv->ndev;
142
143 return 0;
144 }
145
146 static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
147 {
148 nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
149 }
150
151 static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
152 {
153 return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
154 skb);
155 }
156
157 static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
158 {
159 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
160
161 if (priv->ndev->nfc_dev->fw_download_in_progress)
162 return;
163
164 /* Remove BREAK to wake up the NFCC */
165 if (priv->config.break_control && nu->tty->ops->break_ctl) {
166 nu->tty->ops->break_ctl(nu->tty, 0);
167 usleep_range(3000, 5000);
168 }
169 }
170
171 static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
172 {
173 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
174
175 if (priv->ndev->nfc_dev->fw_download_in_progress)
176 return;
177
178 /*
179 ** To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him
180 ** up. we set BREAK. Once we will be ready to send again we will remove
181 ** it.
182 */
183 if (priv->config.break_control && nu->tty->ops->break_ctl) {
184 nu->tty->ops->break_ctl(nu->tty, -1);
185 usleep_range(1000, 3000);
186 }
187 }
188
189 static struct nci_uart nfcmrvl_nci_uart = {
190 .owner = THIS_MODULE,
191 .name = "nfcmrvl_uart",
192 .driver = NCI_UART_DRIVER_MARVELL,
193 .ops = {
194 .open = nfcmrvl_nci_uart_open,
195 .close = nfcmrvl_nci_uart_close,
196 .recv = nfcmrvl_nci_uart_recv,
197 .tx_start = nfcmrvl_nci_uart_tx_start,
198 .tx_done = nfcmrvl_nci_uart_tx_done,
199 }
200 };
201
202 /*
203 ** Module init
204 */
205
206 static int nfcmrvl_uart_init_module(void)
207 {
208 return nci_uart_register(&nfcmrvl_nci_uart);
209 }
210
211 static void nfcmrvl_uart_exit_module(void)
212 {
213 nci_uart_unregister(&nfcmrvl_nci_uart);
214 }
215
216 module_init(nfcmrvl_uart_init_module);
217 module_exit(nfcmrvl_uart_exit_module);
218
219 MODULE_AUTHOR("Marvell International Ltd.");
220 MODULE_DESCRIPTION("Marvell NFC-over-UART");
221 MODULE_LICENSE("GPL v2");
222
223 module_param(flow_control, uint, 0);
224 MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
225
226 module_param(break_control, uint, 0);
227 MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
228
229 module_param(hci_muxed, uint, 0);
230 MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
231
232 module_param(reset_n_io, uint, 0);
233 MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");