NFC: nfcmrvl: add spi driver
This driver adds the support of SPI-based Marvell NFC controller. Signed-off-by: Vincent Cuissard <cuissard@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
parent
2bd832459a
commit
caf6e49bf6
@ -4,6 +4,7 @@ Required properties:
|
||||
- compatible: Should be:
|
||||
- "mrvl,nfc-uart" for UART devices
|
||||
- "mrvl,nfc-i2c" for I2C devices
|
||||
- "mrvl,nfc-spi" for SPI devices
|
||||
|
||||
Optional SoC specific properties:
|
||||
- pinctrl-names: Contains only one value - "default".
|
||||
@ -59,3 +60,27 @@ Example (for ARM-based BeagleBoard Black with 88W8887 on I2C1):
|
||||
reset-n-io = <&gpio3 19 0>;
|
||||
};
|
||||
};
|
||||
|
||||
|
||||
Example (for ARM-based BeagleBoard Black on SPI0):
|
||||
|
||||
&spi0 {
|
||||
|
||||
mrvlnfcspi0: spi@0 {
|
||||
compatible = "mrvl,nfc-spi";
|
||||
|
||||
reg = <0>;
|
||||
|
||||
/* SPI Bus configuration */
|
||||
spi-max-frequency = <3000000>;
|
||||
spi-cpha;
|
||||
spi-cpol;
|
||||
|
||||
/* SPI INT configuration */
|
||||
interrupt-parent = <&gpio1>;
|
||||
interrupts = <17 0>;
|
||||
|
||||
/* Reset IO */
|
||||
reset-n-io = <&gpio3 19 0>;
|
||||
};
|
||||
};
|
||||
|
@ -42,3 +42,13 @@ config NFC_MRVL_I2C
|
||||
Say Y here to compile support for Marvell NFC-over-I2C driver
|
||||
into the kernel or say M to compile it as module.
|
||||
|
||||
config NFC_MRVL_SPI
|
||||
tristate "Marvell NFC-over-SPI driver"
|
||||
depends on NFC_MRVL && SPI
|
||||
help
|
||||
Marvell NFC-over-SPI driver.
|
||||
|
||||
This driver provides support for Marvell NFC-over-SPI devices.
|
||||
|
||||
Say Y here to compile support for Marvell NFC-over-SPI driver
|
||||
into the kernel or say M to compile it as module.
|
||||
|
@ -13,3 +13,6 @@ obj-$(CONFIG_NFC_MRVL_UART) += nfcmrvl_uart.o
|
||||
|
||||
nfcmrvl_i2c-y += i2c.o
|
||||
obj-$(CONFIG_NFC_MRVL_I2C) += nfcmrvl_i2c.o
|
||||
|
||||
nfcmrvl_spi-y += spi.o
|
||||
obj-$(CONFIG_NFC_MRVL_SPI) += nfcmrvl_spi.o
|
||||
|
@ -132,7 +132,11 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
|
||||
nfc_err(dev, "failed to request reset_n io\n");
|
||||
}
|
||||
|
||||
headroom = tailroom = 0;
|
||||
if (phy == NFCMRVL_PHY_SPI) {
|
||||
headroom = NCI_SPI_HDR_LEN;
|
||||
tailroom = 1;
|
||||
} else
|
||||
headroom = tailroom = 0;
|
||||
|
||||
if (priv->config.hci_muxed)
|
||||
headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
|
||||
|
228
drivers/nfc/nfcmrvl/spi.c
Normal file
228
drivers/nfc/nfcmrvl/spi.c
Normal file
@ -0,0 +1,228 @@
|
||||
/**
|
||||
* Marvell NFC-over-SPI driver: SPI interface related functions
|
||||
*
|
||||
* 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/interrupt.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/nfc.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/of_gpio.h>
|
||||
#include <net/nfc/nci.h>
|
||||
#include <net/nfc/nci_core.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/gpio.h>
|
||||
#include "nfcmrvl.h"
|
||||
|
||||
#define SPI_WAIT_HANDSHAKE 1
|
||||
|
||||
struct nfcmrvl_spi_drv_data {
|
||||
unsigned long flags;
|
||||
struct spi_device *spi;
|
||||
struct nci_spi *nci_spi;
|
||||
struct completion handshake_completion;
|
||||
struct nfcmrvl_private *priv;
|
||||
};
|
||||
|
||||
static irqreturn_t nfcmrvl_spi_int_irq_thread_fn(int irq, void *drv_data_ptr)
|
||||
{
|
||||
struct nfcmrvl_spi_drv_data *drv_data = drv_data_ptr;
|
||||
struct sk_buff *skb;
|
||||
|
||||
/*
|
||||
* Special case where we are waiting for SPI_INT deassertion to start a
|
||||
* transfer.
|
||||
*/
|
||||
if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) {
|
||||
complete(&drv_data->handshake_completion);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
/* Normal case, SPI_INT deasserted by slave to trigger a master read */
|
||||
|
||||
skb = nci_spi_read(drv_data->nci_spi);
|
||||
if (!skb) {
|
||||
nfc_err(&drv_data->spi->dev, "failed to read spi packet");
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
|
||||
nfc_err(&drv_data->spi->dev, "corrupted RX packet");
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int nfcmrvl_spi_nci_open(struct nfcmrvl_private *priv)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcmrvl_spi_nci_close(struct nfcmrvl_private *priv)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcmrvl_spi_nci_send(struct nfcmrvl_private *priv,
|
||||
struct sk_buff *skb)
|
||||
{
|
||||
struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
|
||||
int err;
|
||||
|
||||
/* Reinit completion for slave handshake */
|
||||
reinit_completion(&drv_data->handshake_completion);
|
||||
set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags);
|
||||
|
||||
/*
|
||||
* Append a dummy byte at the end of SPI frame. This is due to a
|
||||
* specific DMA implementation in the controller
|
||||
*/
|
||||
skb_put(skb, 1);
|
||||
|
||||
/* Send the SPI packet */
|
||||
err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,
|
||||
skb);
|
||||
if (err != 0) {
|
||||
nfc_err(priv->dev, "spi_send failed %d", err);
|
||||
kfree_skb(skb);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static void nfcmrvl_spi_nci_update_config(struct nfcmrvl_private *priv,
|
||||
const void *param)
|
||||
{
|
||||
struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
|
||||
const struct nfcmrvl_fw_spi_config *config = param;
|
||||
|
||||
drv_data->nci_spi->xfer_speed_hz = config->clk;
|
||||
}
|
||||
|
||||
static struct nfcmrvl_if_ops spi_ops = {
|
||||
.nci_open = nfcmrvl_spi_nci_open,
|
||||
.nci_close = nfcmrvl_spi_nci_close,
|
||||
.nci_send = nfcmrvl_spi_nci_send,
|
||||
.nci_update_config = nfcmrvl_spi_nci_update_config,
|
||||
};
|
||||
|
||||
static int nfcmrvl_spi_parse_dt(struct device_node *node,
|
||||
struct nfcmrvl_platform_data *pdata)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = nfcmrvl_parse_dt(node, pdata);
|
||||
if (ret < 0) {
|
||||
pr_err("Failed to get generic entries\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = irq_of_parse_and_map(node, 0);
|
||||
if (ret < 0) {
|
||||
pr_err("Unable to get irq, error: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
pdata->irq = ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcmrvl_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct nfcmrvl_platform_data *pdata;
|
||||
struct nfcmrvl_platform_data config;
|
||||
struct nfcmrvl_spi_drv_data *drv_data;
|
||||
int ret = 0;
|
||||
|
||||
drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL);
|
||||
if (!drv_data)
|
||||
return -ENOMEM;
|
||||
|
||||
drv_data->spi = spi;
|
||||
drv_data->priv = NULL;
|
||||
spi_set_drvdata(spi, drv_data);
|
||||
|
||||
pdata = spi->dev.platform_data;
|
||||
|
||||
if (!pdata && spi->dev.of_node)
|
||||
if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0)
|
||||
pdata = &config;
|
||||
|
||||
if (!pdata)
|
||||
return -EINVAL;
|
||||
|
||||
ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq,
|
||||
NULL, nfcmrvl_spi_int_irq_thread_fn,
|
||||
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
||||
"nfcmrvl_spi_int", drv_data);
|
||||
if (ret < 0) {
|
||||
nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI,
|
||||
drv_data, &spi_ops,
|
||||
&drv_data->spi->dev,
|
||||
pdata);
|
||||
if (IS_ERR(drv_data->priv))
|
||||
return PTR_ERR(drv_data->priv);
|
||||
|
||||
drv_data->priv->support_fw_dnld = true;
|
||||
|
||||
drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10,
|
||||
drv_data->priv->ndev);
|
||||
|
||||
/* Init completion for slave handshake */
|
||||
init_completion(&drv_data->handshake_completion);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcmrvl_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi);
|
||||
|
||||
nfcmrvl_nci_unregister_dev(drv_data->priv);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id of_nfcmrvl_spi_match[] = {
|
||||
{ .compatible = "mrvl,nfc-spi", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, of_nfcmrvl_spi_match);
|
||||
|
||||
static const struct spi_device_id nfcmrvl_spi_id_table[] = {
|
||||
{ "nfcmrvl_spi", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table);
|
||||
|
||||
static struct spi_driver nfcmrvl_spi_driver = {
|
||||
.probe = nfcmrvl_spi_probe,
|
||||
.remove = nfcmrvl_spi_remove,
|
||||
.id_table = nfcmrvl_spi_id_table,
|
||||
.driver = {
|
||||
.name = "nfcmrvl_spi",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(of_nfcmrvl_spi_match),
|
||||
},
|
||||
};
|
||||
|
||||
module_spi_driver(nfcmrvl_spi_driver);
|
||||
|
||||
MODULE_AUTHOR("Marvell International Ltd.");
|
||||
MODULE_DESCRIPTION("Marvell NFC-over-SPI driver");
|
||||
MODULE_LICENSE("GPL v2");
|
Loading…
Reference in New Issue
Block a user