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212 lines
5.1 KiB
212 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/nfc.h> |
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#include <linux/of_irq.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 "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) |
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nfc_err(priv->dev, "spi_send failed %d", err); |
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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 const 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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const 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[] __maybe_unused = { |
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{ .compatible = "marvell,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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