173 строки
3.9 KiB
C
173 строки
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Altera SPI driver
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*
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* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
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*
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* Based on spi_s3c24xx.c, which is:
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* Copyright (c) 2006 Ben Dooks
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* Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*/
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/spi/altera.h>
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#include <linux/spi/spi.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#define DRV_NAME "spi_altera"
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enum altera_spi_type {
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ALTERA_SPI_TYPE_UNKNOWN,
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ALTERA_SPI_TYPE_SUBDEV,
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};
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static const struct regmap_config spi_altera_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.fast_io = true,
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};
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static int altera_spi_probe(struct platform_device *pdev)
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{
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const struct platform_device_id *platid = platform_get_device_id(pdev);
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struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev);
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enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN;
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struct altera_spi *hw;
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struct spi_controller *host;
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int err = -ENODEV;
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u16 i;
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host = spi_alloc_host(&pdev->dev, sizeof(struct altera_spi));
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if (!host)
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return err;
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/* setup the host state. */
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host->bus_num = -1;
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if (pdata) {
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if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) {
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dev_err(&pdev->dev,
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"Invalid number of chipselect: %u\n",
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pdata->num_chipselect);
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err = -EINVAL;
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goto exit;
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}
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host->num_chipselect = pdata->num_chipselect;
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host->mode_bits = pdata->mode_bits;
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host->bits_per_word_mask = pdata->bits_per_word_mask;
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} else {
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host->num_chipselect = 16;
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host->mode_bits = SPI_CS_HIGH;
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host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
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}
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host->dev.of_node = pdev->dev.of_node;
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hw = spi_controller_get_devdata(host);
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hw->dev = &pdev->dev;
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if (platid)
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type = platid->driver_data;
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/* find and map our resources */
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if (type == ALTERA_SPI_TYPE_SUBDEV) {
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struct resource *regoff;
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hw->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!hw->regmap) {
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dev_err(&pdev->dev, "get regmap failed\n");
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goto exit;
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}
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regoff = platform_get_resource(pdev, IORESOURCE_REG, 0);
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if (regoff)
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hw->regoff = regoff->start;
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} else {
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void __iomem *res;
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res = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(res)) {
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err = PTR_ERR(res);
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goto exit;
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}
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hw->regmap = devm_regmap_init_mmio(&pdev->dev, res,
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&spi_altera_config);
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if (IS_ERR(hw->regmap)) {
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dev_err(&pdev->dev, "regmap mmio init failed\n");
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err = PTR_ERR(hw->regmap);
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goto exit;
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}
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}
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altera_spi_init_host(host);
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/* irq is optional */
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hw->irq = platform_get_irq(pdev, 0);
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if (hw->irq >= 0) {
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err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0,
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pdev->name, host);
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if (err)
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goto exit;
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}
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err = devm_spi_register_controller(&pdev->dev, host);
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if (err)
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goto exit;
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if (pdata) {
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for (i = 0; i < pdata->num_devices; i++) {
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if (!spi_new_device(host, pdata->devices + i))
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dev_warn(&pdev->dev,
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"unable to create SPI device: %s\n",
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pdata->devices[i].modalias);
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}
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}
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dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq);
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return 0;
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exit:
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spi_controller_put(host);
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return err;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id altera_spi_match[] = {
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{ .compatible = "ALTR,spi-1.0", },
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{ .compatible = "altr,spi-1.0", },
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{},
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};
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MODULE_DEVICE_TABLE(of, altera_spi_match);
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#endif /* CONFIG_OF */
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static const struct platform_device_id altera_spi_ids[] = {
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{ DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN },
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{ "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, altera_spi_ids);
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static struct platform_driver altera_spi_driver = {
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.probe = altera_spi_probe,
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.driver = {
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.name = DRV_NAME,
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.pm = NULL,
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.of_match_table = of_match_ptr(altera_spi_match),
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},
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.id_table = altera_spi_ids,
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};
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module_platform_driver(altera_spi_driver);
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MODULE_DESCRIPTION("Altera SPI driver");
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MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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