Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Matthew Gerlach | 740 | 99.73% | 1 | 50.00% |
Russ Weight | 2 | 0.27% | 1 | 50.00% |
Total | 742 | 2 |
// SPDX-License-Identifier: GPL-2.0-only /* * Altera SPI driver * * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw> * * Based on spi_s3c24xx.c, which is: * Copyright (c) 2006 Ben Dooks * Copyright (c) 2006 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> */ #include <linux/interrupt.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/spi/altera.h> #include <linux/spi/spi.h> #include <linux/io.h> #include <linux/of.h> #define DRV_NAME "spi_altera" enum altera_spi_type { ALTERA_SPI_TYPE_UNKNOWN, ALTERA_SPI_TYPE_SUBDEV, }; static const struct regmap_config spi_altera_config = { .reg_bits = 32, .reg_stride = 4, .val_bits = 32, .fast_io = true, }; static int altera_spi_probe(struct platform_device *pdev) { const struct platform_device_id *platid = platform_get_device_id(pdev); struct altera_spi_platform_data *pdata = dev_get_platdata(&pdev->dev); enum altera_spi_type type = ALTERA_SPI_TYPE_UNKNOWN; struct altera_spi *hw; struct spi_master *master; int err = -ENODEV; u16 i; master = spi_alloc_master(&pdev->dev, sizeof(struct altera_spi)); if (!master) return err; /* setup the master state. */ master->bus_num = -1; if (pdata) { if (pdata->num_chipselect > ALTERA_SPI_MAX_CS) { dev_err(&pdev->dev, "Invalid number of chipselect: %u\n", pdata->num_chipselect); err = -EINVAL; goto exit; } master->num_chipselect = pdata->num_chipselect; master->mode_bits = pdata->mode_bits; master->bits_per_word_mask = pdata->bits_per_word_mask; } else { master->num_chipselect = 16; master->mode_bits = SPI_CS_HIGH; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16); } master->dev.of_node = pdev->dev.of_node; hw = spi_master_get_devdata(master); hw->dev = &pdev->dev; if (platid) type = platid->driver_data; /* find and map our resources */ if (type == ALTERA_SPI_TYPE_SUBDEV) { struct resource *regoff; hw->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!hw->regmap) { dev_err(&pdev->dev, "get regmap failed\n"); goto exit; } regoff = platform_get_resource(pdev, IORESOURCE_REG, 0); if (regoff) hw->regoff = regoff->start; } else { void __iomem *res; res = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(res)) { err = PTR_ERR(res); goto exit; } hw->regmap = devm_regmap_init_mmio(&pdev->dev, res, &spi_altera_config); if (IS_ERR(hw->regmap)) { dev_err(&pdev->dev, "regmap mmio init failed\n"); err = PTR_ERR(hw->regmap); goto exit; } } altera_spi_init_master(master); /* irq is optional */ hw->irq = platform_get_irq(pdev, 0); if (hw->irq >= 0) { err = devm_request_irq(&pdev->dev, hw->irq, altera_spi_irq, 0, pdev->name, master); if (err) goto exit; } err = devm_spi_register_master(&pdev->dev, master); if (err) goto exit; if (pdata) { for (i = 0; i < pdata->num_devices; i++) { if (!spi_new_device(master, pdata->devices + i)) dev_warn(&pdev->dev, "unable to create SPI device: %s\n", pdata->devices[i].modalias); } } dev_info(&pdev->dev, "regoff %u, irq %d\n", hw->regoff, hw->irq); return 0; exit: spi_master_put(master); return err; } #ifdef CONFIG_OF static const struct of_device_id altera_spi_match[] = { { .compatible = "ALTR,spi-1.0", }, { .compatible = "altr,spi-1.0", }, {}, }; MODULE_DEVICE_TABLE(of, altera_spi_match); #endif /* CONFIG_OF */ static const struct platform_device_id altera_spi_ids[] = { { DRV_NAME, ALTERA_SPI_TYPE_UNKNOWN }, { "subdev_spi_altera", ALTERA_SPI_TYPE_SUBDEV }, { } }; MODULE_DEVICE_TABLE(platform, altera_spi_ids); static struct platform_driver altera_spi_driver = { .probe = altera_spi_probe, .driver = { .name = DRV_NAME, .pm = NULL, .of_match_table = of_match_ptr(altera_spi_match), }, .id_table = altera_spi_ids, }; module_platform_driver(altera_spi_driver); MODULE_DESCRIPTION("Altera SPI driver"); MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRV_NAME);
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