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Release 4.11 drivers/nfc/nfcmrvl/uart.c

/**
 * Marvell NFC-over-UART driver
 *
 * Copyright (C) 2015, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available on the worldwide web at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#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 unsigned int reset_n_io;

/*
** NFCMRVL NCI OPS
*/


static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv) { return 0; }

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static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv) { return 0; }

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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); }

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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); }

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static 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_find_compatible_node(node, NULL, "marvell,nfc-uart"); if (!matched_node) { matched_node = of_find_compatible_node(node, NULL, "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"); return ret; } if (of_find_property(matched_node, "flow-control", NULL)) pdata->flow_control = 1; else pdata->flow_control = 0; if (of_find_property(matched_node, "break-control", NULL)) pdata->break_control = 1; else pdata->break_control = 0; return 0; }

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/* ** NCI UART OPS */
static int nfcmrvl_nci_uart_open(struct nci_uart *nu) { struct nfcmrvl_private *priv; struct nfcmrvl_platform_data *pdata = NULL; struct nfcmrvl_platform_data config; /* * 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 (nu->tty->dev->parent && nu->tty->dev->parent->of_node) if (nfcmrvl_uart_parse_dt(nu->tty->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, nu->tty->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; }

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static void nfcmrvl_nci_uart_close(struct nci_uart *nu) { nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data); }

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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); }

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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); } }

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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); } }

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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 init */
static int nfcmrvl_uart_init_module(void) { return nci_uart_register(&nfcmrvl_nci_uart); }

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static void nfcmrvl_uart_exit_module(void) { nci_uart_unregister(&nfcmrvl_nci_uart); }

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module_init(nfcmrvl_uart_init_module); module_exit(nfcmrvl_uart_exit_module); 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, uint, 0); MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");

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