Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | // SPDX-License-Identifier: GPL-2.0-only /* * Marvell NFC-over-UART driver * * Copyright (C) 2015, Marvell International Ltd. */ #include <linux/module.h> #include <linux/delay.h> #include <linux/of_gpio.h> #include <net/nfc/nci.h> #include <net/nfc/nci_core.h> #include "nfcmrvl.h" static unsigned int hci_muxed; static unsigned int flow_control; static unsigned int break_control; static int reset_n_io = -EINVAL; /* * NFCMRVL NCI OPS */ static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv) { return 0; } static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv) { return 0; } static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv, struct sk_buff *skb) { struct nci_uart *nu = priv->drv_data; return nu->ops.send(nu, skb); } static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv, const void *param) { struct nci_uart *nu = priv->drv_data; const struct nfcmrvl_fw_uart_config *config = param; nci_uart_set_config(nu, le32_to_cpu(config->baudrate), config->flow_control); } static const struct nfcmrvl_if_ops uart_ops = { .nci_open = nfcmrvl_uart_nci_open, .nci_close = nfcmrvl_uart_nci_close, .nci_send = nfcmrvl_uart_nci_send, .nci_update_config = nfcmrvl_uart_nci_update_config }; static int nfcmrvl_uart_parse_dt(struct device_node *node, struct nfcmrvl_platform_data *pdata) { struct device_node *matched_node; int ret; matched_node = of_get_compatible_child(node, "marvell,nfc-uart"); if (!matched_node) { matched_node = of_get_compatible_child(node, "mrvl,nfc-uart"); if (!matched_node) return -ENODEV; } ret = nfcmrvl_parse_dt(matched_node, pdata); if (ret < 0) { pr_err("Failed to get generic entries\n"); of_node_put(matched_node); return ret; } pdata->flow_control = of_property_read_bool(matched_node, "flow-control"); pdata->break_control = of_property_read_bool(matched_node, "break-control"); of_node_put(matched_node); return 0; } /* * NCI UART OPS */ static int nfcmrvl_nci_uart_open(struct nci_uart *nu) { struct nfcmrvl_private *priv; struct nfcmrvl_platform_data config; const struct nfcmrvl_platform_data *pdata = NULL; struct device *dev = nu->tty->dev; /* * Platform data cannot be used here since usually it is already used * by low level serial driver. We can try to retrieve serial device * and check if DT entries were added. */ if (dev && dev->parent && dev->parent->of_node) if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0) pdata = &config; if (!pdata) { pr_info("No platform data / DT -> fallback to module params\n"); config.hci_muxed = hci_muxed; config.reset_n_io = reset_n_io; config.flow_control = flow_control; config.break_control = break_control; pdata = &config; } priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops, dev, pdata); if (IS_ERR(priv)) return PTR_ERR(priv); priv->support_fw_dnld = true; nu->drv_data = priv; nu->ndev = priv->ndev; return 0; } static void nfcmrvl_nci_uart_close(struct nci_uart *nu) { nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data); } static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb) { return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data, skb); } static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu) { struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data; if (priv->ndev->nfc_dev->fw_download_in_progress) return; /* Remove BREAK to wake up the NFCC */ if (priv->config.break_control && nu->tty->ops->break_ctl) { nu->tty->ops->break_ctl(nu->tty, 0); usleep_range(3000, 5000); } } static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu) { struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data; if (priv->ndev->nfc_dev->fw_download_in_progress) return; /* * To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him * up. we set BREAK. Once we will be ready to send again we will remove * it. */ if (priv->config.break_control && nu->tty->ops->break_ctl) { nu->tty->ops->break_ctl(nu->tty, -1); usleep_range(1000, 3000); } } static struct nci_uart nfcmrvl_nci_uart = { .owner = THIS_MODULE, .name = "nfcmrvl_uart", .driver = NCI_UART_DRIVER_MARVELL, .ops = { .open = nfcmrvl_nci_uart_open, .close = nfcmrvl_nci_uart_close, .recv = nfcmrvl_nci_uart_recv, .tx_start = nfcmrvl_nci_uart_tx_start, .tx_done = nfcmrvl_nci_uart_tx_done, } }; module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister); MODULE_AUTHOR("Marvell International Ltd."); MODULE_DESCRIPTION("Marvell NFC-over-UART"); MODULE_LICENSE("GPL v2"); module_param(flow_control, uint, 0); MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init."); module_param(break_control, uint, 0); MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal."); module_param(hci_muxed, uint, 0); MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one."); module_param(reset_n_io, int, 0); MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal."); |