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// 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.");
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