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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>
13#include "nfcmrvl.h"
14
15static unsigned int hci_muxed;
16static unsigned int flow_control;
17static unsigned int break_control;
18static int reset_n_io = -EINVAL;
19
20
21
22
23
24static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
25{
26 return 0;
27}
28
29static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
30{
31 return 0;
32}
33
34static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
35 struct sk_buff *skb)
36{
37 struct nci_uart *nu = priv->drv_data;
38
39 return nu->ops.send(nu, skb);
40}
41
42static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
43 const void *param)
44{
45 struct nci_uart *nu = priv->drv_data;
46 const struct nfcmrvl_fw_uart_config *config = param;
47
48 nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
49 config->flow_control);
50}
51
52static 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
57};
58
59static int nfcmrvl_uart_parse_dt(struct device_node *node,
60 struct nfcmrvl_platform_data *pdata)
61{
62 struct device_node *matched_node;
63 int ret;
64
65 matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
66 if (!matched_node) {
67 matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
68 if (!matched_node)
69 return -ENODEV;
70 }
71
72 ret = nfcmrvl_parse_dt(matched_node, pdata);
73 if (ret < 0) {
74 pr_err("Failed to get generic entries\n");
75 of_node_put(matched_node);
76 return ret;
77 }
78
79 if (of_find_property(matched_node, "flow-control", NULL))
80 pdata->flow_control = 1;
81 else
82 pdata->flow_control = 0;
83
84 if (of_find_property(matched_node, "break-control", NULL))
85 pdata->break_control = 1;
86 else
87 pdata->break_control = 0;
88
89 of_node_put(matched_node);
90
91 return 0;
92}
93
94
95
96
97
98static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
99{
100 struct nfcmrvl_private *priv;
101 struct nfcmrvl_platform_data *pdata = NULL;
102 struct nfcmrvl_platform_data config;
103 struct device *dev = nu->tty->dev;
104
105
106
107
108
109
110
111 if (dev && dev->parent && dev->parent->of_node)
112 if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
113 pdata = &config;
114
115 if (!pdata) {
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;
121 pdata = &config;
122 }
123
124 priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
125 dev, pdata);
126 if (IS_ERR(priv))
127 return PTR_ERR(priv);
128
129 priv->support_fw_dnld = true;
130
131 nu->drv_data = priv;
132 nu->ndev = priv->ndev;
133
134 return 0;
135}
136
137static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
138{
139 nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
140}
141
142static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
143{
144 return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
145 skb);
146}
147
148static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
149{
150 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
151
152 if (priv->ndev->nfc_dev->fw_download_in_progress)
153 return;
154
155
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);
159 }
160}
161
162static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
163{
164 struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
165
166 if (priv->ndev->nfc_dev->fw_download_in_progress)
167 return;
168
169
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172
173
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);
177 }
178}
179
180static struct nci_uart nfcmrvl_nci_uart = {
181 .owner = THIS_MODULE,
182 .name = "nfcmrvl_uart",
183 .driver = NCI_UART_DRIVER_MARVELL,
184 .ops = {
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,
190 }
191};
192module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister);
193
194MODULE_AUTHOR("Marvell International Ltd.");
195MODULE_DESCRIPTION("Marvell NFC-over-UART");
196MODULE_LICENSE("GPL v2");
197
198module_param(flow_control, uint, 0);
199MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
200
201module_param(break_control, uint, 0);
202MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
203
204module_param(hci_muxed, uint, 0);
205MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
206
207module_param(reset_n_io, int, 0);
208MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");
209
