1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Marvell NFC-over-UART driver |
4 | * |
5 | * Copyright (C) 2015, Marvell International Ltd. |
6 | */ |
7 | |
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 | |
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; |
19 | |
20 | /* |
21 | * NFCMRVL NCI OPS |
22 | */ |
23 | |
24 | static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv) |
25 | { |
26 | return 0; |
27 | } |
28 | |
29 | static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv) |
30 | { |
31 | return 0; |
32 | } |
33 | |
34 | static 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 | |
42 | static 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 | flow_ctrl: config->flow_control); |
50 | } |
51 | |
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 |
57 | }; |
58 | |
59 | static 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(parent: node, compatible: "marvell,nfc-uart" ); |
66 | if (!matched_node) { |
67 | matched_node = of_get_compatible_child(parent: node, compatible: "mrvl,nfc-uart" ); |
68 | if (!matched_node) |
69 | return -ENODEV; |
70 | } |
71 | |
72 | ret = nfcmrvl_parse_dt(node: matched_node, pdata); |
73 | if (ret < 0) { |
74 | pr_err("Failed to get generic entries\n" ); |
75 | of_node_put(node: matched_node); |
76 | return ret; |
77 | } |
78 | |
79 | pdata->flow_control = of_property_read_bool(np: matched_node, propname: "flow-control" ); |
80 | pdata->break_control = of_property_read_bool(np: matched_node, propname: "break-control" ); |
81 | |
82 | of_node_put(node: matched_node); |
83 | |
84 | return 0; |
85 | } |
86 | |
87 | /* |
88 | * NCI UART OPS |
89 | */ |
90 | |
91 | static int nfcmrvl_nci_uart_open(struct nci_uart *nu) |
92 | { |
93 | struct nfcmrvl_private *priv; |
94 | struct nfcmrvl_platform_data config; |
95 | const struct nfcmrvl_platform_data *pdata = NULL; |
96 | struct device *dev = nu->tty->dev; |
97 | |
98 | /* |
99 | * Platform data cannot be used here since usually it is already used |
100 | * by low level serial driver. We can try to retrieve serial device |
101 | * and check if DT entries were added. |
102 | */ |
103 | |
104 | if (dev && dev->parent && dev->parent->of_node) |
105 | if (nfcmrvl_uart_parse_dt(node: dev->parent->of_node, pdata: &config) == 0) |
106 | pdata = &config; |
107 | |
108 | if (!pdata) { |
109 | pr_info("No platform data / DT -> fallback to module params\n" ); |
110 | config.hci_muxed = hci_muxed; |
111 | config.reset_n_io = reset_n_io; |
112 | config.flow_control = flow_control; |
113 | config.break_control = break_control; |
114 | pdata = &config; |
115 | } |
116 | |
117 | priv = nfcmrvl_nci_register_dev(phy: NFCMRVL_PHY_UART, drv_data: nu, ops: &uart_ops, |
118 | dev, pdata); |
119 | if (IS_ERR(ptr: priv)) |
120 | return PTR_ERR(ptr: priv); |
121 | |
122 | priv->support_fw_dnld = true; |
123 | |
124 | nu->drv_data = priv; |
125 | nu->ndev = priv->ndev; |
126 | |
127 | return 0; |
128 | } |
129 | |
130 | static void nfcmrvl_nci_uart_close(struct nci_uart *nu) |
131 | { |
132 | nfcmrvl_nci_unregister_dev(priv: (struct nfcmrvl_private *)nu->drv_data); |
133 | } |
134 | |
135 | static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb) |
136 | { |
137 | return nfcmrvl_nci_recv_frame(priv: (struct nfcmrvl_private *)nu->drv_data, |
138 | skb); |
139 | } |
140 | |
141 | static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu) |
142 | { |
143 | struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data; |
144 | |
145 | if (priv->ndev->nfc_dev->fw_download_in_progress) |
146 | return; |
147 | |
148 | /* Remove BREAK to wake up the NFCC */ |
149 | if (priv->config.break_control && nu->tty->ops->break_ctl) { |
150 | nu->tty->ops->break_ctl(nu->tty, 0); |
151 | usleep_range(min: 3000, max: 5000); |
152 | } |
153 | } |
154 | |
155 | static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu) |
156 | { |
157 | struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data; |
158 | |
159 | if (priv->ndev->nfc_dev->fw_download_in_progress) |
160 | return; |
161 | |
162 | /* |
163 | * To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him |
164 | * up. we set BREAK. Once we will be ready to send again we will remove |
165 | * it. |
166 | */ |
167 | if (priv->config.break_control && nu->tty->ops->break_ctl) { |
168 | nu->tty->ops->break_ctl(nu->tty, -1); |
169 | usleep_range(min: 1000, max: 3000); |
170 | } |
171 | } |
172 | |
173 | static struct nci_uart nfcmrvl_nci_uart = { |
174 | .owner = THIS_MODULE, |
175 | .name = "nfcmrvl_uart" , |
176 | .driver = NCI_UART_DRIVER_MARVELL, |
177 | .ops = { |
178 | .open = nfcmrvl_nci_uart_open, |
179 | .close = nfcmrvl_nci_uart_close, |
180 | .recv = nfcmrvl_nci_uart_recv, |
181 | .tx_start = nfcmrvl_nci_uart_tx_start, |
182 | .tx_done = nfcmrvl_nci_uart_tx_done, |
183 | } |
184 | }; |
185 | module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister); |
186 | |
187 | MODULE_AUTHOR("Marvell International Ltd." ); |
188 | MODULE_DESCRIPTION("Marvell NFC-over-UART" ); |
189 | MODULE_LICENSE("GPL v2" ); |
190 | |
191 | module_param(flow_control, uint, 0); |
192 | MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init." ); |
193 | |
194 | module_param(break_control, uint, 0); |
195 | MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal." ); |
196 | |
197 | module_param(hci_muxed, uint, 0); |
198 | MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one." ); |
199 | |
200 | module_param(reset_n_io, int, 0); |
201 | MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal." ); |
202 | |