1 // SPDX-License-Identifier: GPL-2.0-only
3  * Marvell NFC-over-SPI driver: SPI interface related functions
14 #include <linux/spi/spi.h>
21 	struct spi_device *spi;  member
36 	if (test_and_clear_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags)) {  in nfcmrvl_spi_int_irq_thread_fn()
37 		complete(&drv_data->handshake_completion);  in nfcmrvl_spi_int_irq_thread_fn()
41 	/* Normal case, SPI_INT deasserted by slave to trigger a master read */  in nfcmrvl_spi_int_irq_thread_fn()
43 	skb = nci_spi_read(drv_data->nci_spi);  in nfcmrvl_spi_int_irq_thread_fn()
45 		nfc_err(&drv_data->spi->dev, "failed to read spi packet");  in nfcmrvl_spi_int_irq_thread_fn()
49 	if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)  in nfcmrvl_spi_int_irq_thread_fn()
50 		nfc_err(&drv_data->spi->dev, "corrupted RX packet");  in nfcmrvl_spi_int_irq_thread_fn()
68 	struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;  in nfcmrvl_spi_nci_send()
71 	/* Reinit completion for slave handshake */  in nfcmrvl_spi_nci_send()
72 	reinit_completion(&drv_data->handshake_completion);  in nfcmrvl_spi_nci_send()
73 	set_bit(SPI_WAIT_HANDSHAKE, &drv_data->flags);  in nfcmrvl_spi_nci_send()
76 	 * Append a dummy byte at the end of SPI frame. This is due to a  in nfcmrvl_spi_nci_send()
81 	/* Send the SPI packet */  in nfcmrvl_spi_nci_send()
82 	err = nci_spi_send(drv_data->nci_spi, &drv_data->handshake_completion,  in nfcmrvl_spi_nci_send()
85 		nfc_err(priv->dev, "spi_send failed %d", err);  in nfcmrvl_spi_nci_send()
93 	struct nfcmrvl_spi_drv_data *drv_data = priv->drv_data;  in nfcmrvl_spi_nci_update_config()
96 	drv_data->nci_spi->xfer_speed_hz = config->clk;  in nfcmrvl_spi_nci_update_config()
120 		return -EINVAL;  in nfcmrvl_spi_parse_dt()
122 	pdata->irq = ret;  in nfcmrvl_spi_parse_dt()
127 static int nfcmrvl_spi_probe(struct spi_device *spi)  in nfcmrvl_spi_probe()  argument
134 	drv_data = devm_kzalloc(&spi->dev, sizeof(*drv_data), GFP_KERNEL);  in nfcmrvl_spi_probe()
136 		return -ENOMEM;  in nfcmrvl_spi_probe()
138 	drv_data->spi = spi;  in nfcmrvl_spi_probe()
139 	drv_data->priv = NULL;  in nfcmrvl_spi_probe()
140 	spi_set_drvdata(spi, drv_data);  in nfcmrvl_spi_probe()
142 	pdata = spi->dev.platform_data;  in nfcmrvl_spi_probe()
144 	if (!pdata && spi->dev.of_node)  in nfcmrvl_spi_probe()
145 		if (nfcmrvl_spi_parse_dt(spi->dev.of_node, &config) == 0)  in nfcmrvl_spi_probe()
149 		return -EINVAL;  in nfcmrvl_spi_probe()
151 	ret = devm_request_threaded_irq(&drv_data->spi->dev, pdata->irq,  in nfcmrvl_spi_probe()
156 		nfc_err(&drv_data->spi->dev, "Unable to register IRQ handler");  in nfcmrvl_spi_probe()
157 		return -ENODEV;  in nfcmrvl_spi_probe()
160 	drv_data->priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_SPI,  in nfcmrvl_spi_probe()
162 						  &drv_data->spi->dev,  in nfcmrvl_spi_probe()
164 	if (IS_ERR(drv_data->priv))  in nfcmrvl_spi_probe()
165 		return PTR_ERR(drv_data->priv);  in nfcmrvl_spi_probe()
167 	drv_data->priv->support_fw_dnld = true;  in nfcmrvl_spi_probe()
169 	drv_data->nci_spi = nci_spi_allocate_spi(drv_data->spi, 0, 10,  in nfcmrvl_spi_probe()
170 						 drv_data->priv->ndev);  in nfcmrvl_spi_probe()
172 	/* Init completion for slave handshake */  in nfcmrvl_spi_probe()
173 	init_completion(&drv_data->handshake_completion);  in nfcmrvl_spi_probe()
177 static void nfcmrvl_spi_remove(struct spi_device *spi)  in nfcmrvl_spi_remove()  argument
179 	struct nfcmrvl_spi_drv_data *drv_data = spi_get_drvdata(spi);  in nfcmrvl_spi_remove()
181 	nfcmrvl_nci_unregister_dev(drv_data->priv);  in nfcmrvl_spi_remove()
185 	{ .compatible = "marvell,nfc-spi", },
194 MODULE_DEVICE_TABLE(spi, nfcmrvl_spi_id_table);
209 MODULE_DESCRIPTION("Marvell NFC-over-SPI driver");