/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2011, 2012 Cavium, Inc. */ #include <linux/platform_device.h> #include <linux/spi/spi.h> #include <linux/module.h> #include <linux/io.h> #include <linux/of.h> #include <asm/octeon/octeon.h> #include "spi-cavium.h" static int octeon_spi_probe(struct platform_device *pdev) { void __iomem *reg_base; struct spi_master *master; struct octeon_spi *p; int err = -ENOENT; master = spi_alloc_master(&pdev->dev, sizeof(struct octeon_spi)); if (!master) return -ENOMEM; p = spi_master_get_devdata(master); platform_set_drvdata(pdev, master); reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(reg_base)) { err = PTR_ERR(reg_base); goto fail; } p->register_base = reg_base; p->sys_freq = octeon_get_io_clock_rate(); p->regs.config = 0; p->regs.status = 0x08; p->regs.tx = 0x10; p->regs.data = 0x80; master->num_chipselect = 4; master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST | SPI_3WIRE; master->transfer_one_message = octeon_spi_transfer_one_message; master->bits_per_word_mask = SPI_BPW_MASK(8); master->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ; master->dev.of_node = pdev->dev.of_node; err = devm_spi_register_master(&pdev->dev, master); if (err) { dev_err(&pdev->dev, "register master failed: %d\n", err); goto fail; } dev_info(&pdev->dev, "OCTEON SPI bus driver\n"); return 0; fail: spi_master_put(master); return err; } static int octeon_spi_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct octeon_spi *p = spi_master_get_devdata(master); /* Clear the CSENA* and put everything in a known state. */ writeq(0, p->register_base + OCTEON_SPI_CFG(p)); return 0; } static const struct of_device_id octeon_spi_match[] = { { .compatible = "cavium,octeon-3010-spi", }, {}, }; MODULE_DEVICE_TABLE(of, octeon_spi_match); static struct platform_driver octeon_spi_driver = { .driver = { .name = "spi-octeon", .of_match_table = octeon_spi_match, }, .probe = octeon_spi_probe, .remove = octeon_spi_remove, }; module_platform_driver(octeon_spi_driver); MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver"); MODULE_AUTHOR("David Daney"); MODULE_LICENSE("GPL");