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Vincent CuissardSamuel Ortiz
Vincent Cuissard
authored and
Samuel Ortiz
committed
NFC: nfcmrvl: add spi driver
This driver adds the support of SPI-based Marvell NFC controller. Signed-off-by: Vincent Cuissard <[email protected]> Signed-off-by: Samuel Ortiz <[email protected]>
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‎Documentation/devicetree/bindings/net/nfc/nfcmrvl.txt‎

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@@ -4,6 +4,7 @@ Required properties:
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- compatible: Should be:
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- "mrvl,nfc-uart" for UART devices
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- "mrvl,nfc-i2c" for I2C devices
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- "mrvl,nfc-spi" for SPI devices
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Optional SoC specific properties:
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- pinctrl-names: Contains only one value - "default".
@@ -59,3 +60,27 @@ Example (for ARM-based BeagleBoard Black with 88W8887 on I2C1):
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reset-n-io = <&gpio3 19 0>;
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};
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};
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Example (for ARM-based BeagleBoard Black on SPI0):
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&spi0 {
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mrvlnfcspi0: spi@0 {
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compatible = "mrvl,nfc-spi";
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reg = <0>;
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/* SPI Bus configuration */
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spi-max-frequency = <3000000>;
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spi-cpha;
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spi-cpol;
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/* SPI INT configuration */
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interrupt-parent = <&gpio1>;
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interrupts = <17 0>;
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/* Reset IO */
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reset-n-io = <&gpio3 19 0>;
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};
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};

‎drivers/nfc/nfcmrvl/Kconfig‎

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@@ -42,3 +42,13 @@ config NFC_MRVL_I2C
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Say Y here to compile support for Marvell NFC-over-I2C driver
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into the kernel or say M to compile it as module.
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config NFC_MRVL_SPI
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tristate "Marvell NFC-over-SPI driver"
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depends on NFC_MRVL && SPI
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help
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Marvell NFC-over-SPI driver.
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This driver provides support for Marvell NFC-over-SPI devices.
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Say Y here to compile support for Marvell NFC-over-SPI driver
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into the kernel or say M to compile it as module.

‎drivers/nfc/nfcmrvl/Makefile‎

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@@ -13,3 +13,6 @@ obj-$(CONFIG_NFC_MRVL_UART) += nfcmrvl_uart.o
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nfcmrvl_i2c-y += i2c.o
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obj-$(CONFIG_NFC_MRVL_I2C) += nfcmrvl_i2c.o
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nfcmrvl_spi-y += spi.o
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obj-$(CONFIG_NFC_MRVL_SPI) += nfcmrvl_spi.o

‎drivers/nfc/nfcmrvl/main.c‎

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@@ -132,7 +132,11 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
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nfc_err(dev, "failed to request reset_n io\n");
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}
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headroom = tailroom = 0;
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if (phy == NFCMRVL_PHY_SPI) {
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headroom = NCI_SPI_HDR_LEN;
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tailroom = 1;
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} else
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headroom = tailroom = 0;
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if (priv->config.hci_muxed)
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headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;

‎drivers/nfc/nfcmrvl/spi.c‎

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@@ -0,0 +1,228 @@
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/**
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* Marvell NFC-over-SPI driver: SPI interface related functions
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*
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* Copyright (C) 2015, Marvell International Ltd.
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*
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* This software file (the "File") is distributed by Marvell International
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* Ltd. under the terms of the GNU General Public License Version 2, June 1991
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* (the "License"). You may use, redistribute and/or modify this File in
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* accordance with the terms and conditions of the License, a copy of which
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* is available on the worldwide web at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
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*
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
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* this warranty disclaimer.
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**/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <linux/nfc.h>
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#include <linux/gpio.h>
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#include <linux/of_irq.h>
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#include <linux/of_gpio.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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#include <linux/spi/spi.h>
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#include <linux/gpio.h>
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#include "nfcmrvl.h"
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#define SPI_WAIT_HANDSHAKE 1
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struct nfcmrvl_spi_drv_data {
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unsigned long flags;
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struct spi_device *spi;
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struct nci_spi *nci_spi;
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struct completion handshake_completion;
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struct nfcmrvl_private *priv;
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};
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static irqreturn_t nfcmrvl_spi_int_irq_thread_fn(int irq, void *drv_data_ptr)
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{
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struct nfcmrvl_spi_drv_data *drv_data = drv_data_ptr;
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struct sk_buff *skb;
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/*
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* Special case where we are waiting for SPI_INT deassertion to start a
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* transfer.
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*/
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if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) {
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complete(&drv_data->handshake_completion);
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return IRQ_HANDLED;
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}
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/* Normal case, SPI_INT deasserted by slave to trigger a master read */
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skb = nci_spi_read(drv_data->nci_spi);
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if (!skb) {
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nfc_err(&drv_data->spi->dev, "failed to read spi packet");
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return IRQ_HANDLED;
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}
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if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
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nfc_err(&drv_data->spi->dev, "corrupted RX packet");
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return IRQ_HANDLED;
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}
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static int nfcmrvl_spi_nci_open(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_spi_nci_close(struct nfcmrvl_private *priv)
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{
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return 0;
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}
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static int nfcmrvl_spi_nci_send(struct nfcmrvl_private *priv,
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struct sk_buff *skb)
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{
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struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
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int err;
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/* Reinit completion for slave handshake */
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reinit_completion(&drv_data->handshake_completion);
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set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags);
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/*
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* Append a dummy byte at the end of SPI frame. This is due to a
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* specific DMA implementation in the controller
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*/
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skb_put(skb, 1);
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/* Send the SPI packet */
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err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,
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skb);
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if (err != 0) {
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nfc_err(priv->dev, "spi_send failed %d", err);
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kfree_skb(skb);
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}
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return err;
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}
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static void nfcmrvl_spi_nci_update_config(struct nfcmrvl_private *priv,
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const void *param)
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{
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struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
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const struct nfcmrvl_fw_spi_config *config = param;
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drv_data->nci_spi->xfer_speed_hz = config->clk;
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}
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static struct nfcmrvl_if_ops spi_ops = {
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.nci_open = nfcmrvl_spi_nci_open,
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.nci_close = nfcmrvl_spi_nci_close,
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.nci_send = nfcmrvl_spi_nci_send,
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.nci_update_config = nfcmrvl_spi_nci_update_config,
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};
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static int nfcmrvl_spi_parse_dt(struct device_node *node,
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struct nfcmrvl_platform_data *pdata)
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{
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int ret;
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ret = nfcmrvl_parse_dt(node, pdata);
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if (ret < 0) {
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pr_err("Failed to get generic entries\n");
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return ret;
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}
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ret = irq_of_parse_and_map(node, 0);
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if (ret < 0) {
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pr_err("Unable to get irq, error: %d\n", ret);
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return ret;
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}
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pdata->irq = ret;
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return 0;
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}
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static int nfcmrvl_spi_probe(struct spi_device *spi)
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{
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struct nfcmrvl_platform_data *pdata;
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struct nfcmrvl_platform_data config;
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struct nfcmrvl_spi_drv_data *drv_data;
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int ret = 0;
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drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL);
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if (!drv_data)
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return -ENOMEM;
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drv_data->spi = spi;
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drv_data->priv = NULL;
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spi_set_drvdata(spi, drv_data);
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pdata = spi->dev.platform_data;
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if (!pdata && spi->dev.of_node)
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if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0)
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pdata = &config;
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if (!pdata)
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return -EINVAL;
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ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq,
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NULL, nfcmrvl_spi_int_irq_thread_fn,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"nfcmrvl_spi_int", drv_data);
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if (ret < 0) {
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nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler");
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return -ENODEV;
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}
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drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI,
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drv_data, &spi_ops,
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&drv_data->spi->dev,
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pdata);
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if (IS_ERR(drv_data->priv))
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return PTR_ERR(drv_data->priv);
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drv_data->priv->support_fw_dnld = true;
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drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10,
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drv_data->priv->ndev);
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/* Init completion for slave handshake */
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init_completion(&drv_data->handshake_completion);
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return 0;
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}
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static int nfcmrvl_spi_remove(struct spi_device *spi)
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{
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struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi);
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nfcmrvl_nci_unregister_dev(drv_data->priv);
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return 0;
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}
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static const struct of_device_id of_nfcmrvl_spi_match[] = {
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{ .compatible = "mrvl,nfc-spi", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_nfcmrvl_spi_match);
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static const struct spi_device_id nfcmrvl_spi_id_table[] = {
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{ "nfcmrvl_spi", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table);
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static struct spi_driver nfcmrvl_spi_driver = {
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.probe = nfcmrvl_spi_probe,
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.remove = nfcmrvl_spi_remove,
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.id_table = nfcmrvl_spi_id_table,
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.driver = {
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.name = "nfcmrvl_spi",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_nfcmrvl_spi_match),
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},
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};
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module_spi_driver(nfcmrvl_spi_driver);
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MODULE_AUTHOR("Marvell International Ltd.");
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MODULE_DESCRIPTION("Marvell NFC-over-SPI driver");
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MODULE_LICENSE("GPL v2");

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