2 * Marvell NFC-over-SPI driver: SPI interface related functions
4 * Copyright (C) 2015, Marvell International Ltd.
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available on the worldwide web at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
14 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
15 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
16 * this warranty disclaimer.
19 #include <linux/module.h>
20 #include <linux/interrupt.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/nfc.h>
23 #include <linux/gpio.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_gpio.h>
26 #include <net/nfc/nci.h>
27 #include <net/nfc/nci_core.h>
28 #include <linux/spi/spi.h>
29 #include <linux/gpio.h>
32 #define SPI_WAIT_HANDSHAKE 1
34 struct nfcmrvl_spi_drv_data {
36 struct spi_device *spi;
37 struct nci_spi *nci_spi;
38 struct completion handshake_completion;
39 struct nfcmrvl_private *priv;
42 static irqreturn_t nfcmrvl_spi_int_irq_thread_fn(int irq, void *drv_data_ptr)
44 struct nfcmrvl_spi_drv_data *drv_data = drv_data_ptr;
48 * Special case where we are waiting for SPI_INT deassertion to start a
51 if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) {
52 complete(&drv_data->handshake_completion);
56 /* Normal case, SPI_INT deasserted by slave to trigger a master read */
58 skb = nci_spi_read(drv_data->nci_spi);
60 nfc_err(&drv_data->spi->dev, "failed to read spi packet");
64 if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
65 nfc_err(&drv_data->spi->dev, "corrupted RX packet");
70 static int nfcmrvl_spi_nci_open(struct nfcmrvl_private *priv)
75 static int nfcmrvl_spi_nci_close(struct nfcmrvl_private *priv)
80 static int nfcmrvl_spi_nci_send(struct nfcmrvl_private *priv,
83 struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
86 /* Reinit completion for slave handshake */
87 reinit_completion(&drv_data->handshake_completion);
88 set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags);
91 * Append a dummy byte at the end of SPI frame. This is due to a
92 * specific DMA implementation in the controller
96 /* Send the SPI packet */
97 err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,
100 nfc_err(priv->dev, "spi_send failed %d", err);
106 static void nfcmrvl_spi_nci_update_config(struct nfcmrvl_private *priv,
109 struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;
110 const struct nfcmrvl_fw_spi_config *config = param;
112 drv_data->nci_spi->xfer_speed_hz = config->clk;
115 static struct nfcmrvl_if_ops spi_ops = {
116 .nci_open = nfcmrvl_spi_nci_open,
117 .nci_close = nfcmrvl_spi_nci_close,
118 .nci_send = nfcmrvl_spi_nci_send,
119 .nci_update_config = nfcmrvl_spi_nci_update_config,
122 static int nfcmrvl_spi_parse_dt(struct device_node *node,
123 struct nfcmrvl_platform_data *pdata)
127 ret = nfcmrvl_parse_dt(node, pdata);
129 pr_err("Failed to get generic entries\n");
133 ret = irq_of_parse_and_map(node, 0);
135 pr_err("Unable to get irq, error: %d\n", ret);
143 static int nfcmrvl_spi_probe(struct spi_device *spi)
145 struct nfcmrvl_platform_data *pdata;
146 struct nfcmrvl_platform_data config;
147 struct nfcmrvl_spi_drv_data *drv_data;
150 drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL);
155 drv_data->priv = NULL;
156 spi_set_drvdata(spi, drv_data);
158 pdata = spi->dev.platform_data;
160 if (!pdata && spi->dev.of_node)
161 if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0)
167 ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq,
168 NULL, nfcmrvl_spi_int_irq_thread_fn,
169 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
170 "nfcmrvl_spi_int", drv_data);
172 nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler");
176 drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI,
180 if (IS_ERR(drv_data->priv))
181 return PTR_ERR(drv_data->priv);
183 drv_data->priv->support_fw_dnld = true;
185 drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10,
186 drv_data->priv->ndev);
188 /* Init completion for slave handshake */
189 init_completion(&drv_data->handshake_completion);
193 static int nfcmrvl_spi_remove(struct spi_device *spi)
195 struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi);
197 nfcmrvl_nci_unregister_dev(drv_data->priv);
201 static const struct of_device_id of_nfcmrvl_spi_match[] = {
202 { .compatible = "marvell,nfc-spi", },
205 MODULE_DEVICE_TABLE(of, of_nfcmrvl_spi_match);
207 static const struct spi_device_id nfcmrvl_spi_id_table[] = {
208 { "nfcmrvl_spi", 0 },
211 MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table);
213 static struct spi_driver nfcmrvl_spi_driver = {
214 .probe = nfcmrvl_spi_probe,
215 .remove = nfcmrvl_spi_remove,
216 .id_table = nfcmrvl_spi_id_table,
218 .name = "nfcmrvl_spi",
219 .owner = THIS_MODULE,
220 .of_match_table = of_match_ptr(of_nfcmrvl_spi_match),
224 module_spi_driver(nfcmrvl_spi_driver);
226 MODULE_AUTHOR("Marvell International Ltd.");
227 MODULE_DESCRIPTION("Marvell NFC-over-SPI driver");
228 MODULE_LICENSE("GPL v2");