2021-05-31 07:35:14 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
2021-05-23 21:09:09 +00:00
|
|
|
/*
|
2015-06-11 12:00:20 +00:00
|
|
|
* 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;
|
2019-08-05 10:00:55 +00:00
|
|
|
static int reset_n_io = -EINVAL;
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
/*
|
2021-05-31 07:35:15 +00:00
|
|
|
* NFCMRVL NCI OPS
|
|
|
|
*/
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2015-10-26 09:27:39 +00:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2021-07-29 10:42:41 +00:00
|
|
|
static const struct nfcmrvl_if_ops uart_ops = {
|
2015-06-11 12:00:20 +00:00
|
|
|
.nci_open = nfcmrvl_uart_nci_open,
|
|
|
|
.nci_close = nfcmrvl_uart_nci_close,
|
|
|
|
.nci_send = nfcmrvl_uart_nci_send,
|
2015-10-26 09:27:39 +00:00
|
|
|
.nci_update_config = nfcmrvl_uart_nci_update_config
|
2015-06-11 12:00:20 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static int nfcmrvl_uart_parse_dt(struct device_node *node,
|
|
|
|
struct nfcmrvl_platform_data *pdata)
|
|
|
|
{
|
|
|
|
struct device_node *matched_node;
|
|
|
|
int ret;
|
|
|
|
|
2018-08-27 08:21:52 +00:00
|
|
|
matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
|
2015-10-26 09:27:45 +00:00
|
|
|
if (!matched_node) {
|
2018-08-27 08:21:52 +00:00
|
|
|
matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
|
2015-10-26 09:27:45 +00:00
|
|
|
if (!matched_node)
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
ret = nfcmrvl_parse_dt(matched_node, pdata);
|
|
|
|
if (ret < 0) {
|
|
|
|
pr_err("Failed to get generic entries\n");
|
2017-03-30 10:15:40 +00:00
|
|
|
of_node_put(matched_node);
|
2015-06-11 12:00:20 +00:00
|
|
|
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;
|
|
|
|
|
2017-03-30 10:15:40 +00:00
|
|
|
of_node_put(matched_node);
|
|
|
|
|
2015-06-11 12:00:20 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2021-05-31 07:35:15 +00:00
|
|
|
* NCI UART OPS
|
|
|
|
*/
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
|
|
|
|
{
|
|
|
|
struct nfcmrvl_private *priv;
|
|
|
|
struct nfcmrvl_platform_data config;
|
2021-07-29 10:40:21 +00:00
|
|
|
const struct nfcmrvl_platform_data *pdata = NULL;
|
2017-03-30 10:15:36 +00:00
|
|
|
struct device *dev = nu->tty->dev;
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2017-03-30 10:15:36 +00:00
|
|
|
if (dev && dev->parent && dev->parent->of_node)
|
|
|
|
if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
|
2015-06-11 12:00:20 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2015-10-26 09:27:40 +00:00
|
|
|
priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
|
2017-03-30 10:15:36 +00:00
|
|
|
dev, pdata);
|
2015-06-11 12:00:20 +00:00
|
|
|
if (IS_ERR(priv))
|
|
|
|
return PTR_ERR(priv);
|
|
|
|
|
2015-10-26 09:27:39 +00:00
|
|
|
priv->support_fw_dnld = true;
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2015-11-03 18:19:32 +00:00
|
|
|
if (priv->ndev->nfc_dev->fw_download_in_progress)
|
|
|
|
return;
|
|
|
|
|
2015-06-11 12:00:20 +00:00
|
|
|
/* 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;
|
|
|
|
|
2015-11-03 18:19:32 +00:00
|
|
|
if (priv->ndev->nfc_dev->fw_download_in_progress)
|
|
|
|
return;
|
|
|
|
|
2015-06-11 12:00:20 +00:00
|
|
|
/*
|
2021-05-31 07:35:15 +00:00
|
|
|
* 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.
|
|
|
|
*/
|
2015-11-03 18:19:33 +00:00
|
|
|
if (priv->config.break_control && nu->tty->ops->break_ctl) {
|
2015-06-11 12:00:20 +00:00
|
|
|
nu->tty->ops->break_ctl(nu->tty, -1);
|
2015-11-03 18:19:33 +00:00
|
|
|
usleep_range(1000, 3000);
|
|
|
|
}
|
2015-06-11 12:00:20 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
|
|
|
}
|
|
|
|
};
|
2021-05-31 07:38:56 +00:00
|
|
|
module_driver(nfcmrvl_nci_uart, nci_uart_register, nci_uart_unregister);
|
2015-06-11 12:00:20 +00:00
|
|
|
|
|
|
|
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.");
|
|
|
|
|
2019-08-05 10:00:55 +00:00
|
|
|
module_param(reset_n_io, int, 0);
|
2015-06-11 12:00:20 +00:00
|
|
|
MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");
|