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1/*2 * This file is subject to the terms and conditions of the GNU General Public3 * License. See the file "COPYING" in the main directory of this archive4 * for more details.5 *6 * Copyright (C) 2011, 2012 Cavium, Inc.7 */8 9#include <linux/platform_device.h>10#include <linux/spi/spi.h>11#include <linux/module.h>12#include <linux/io.h>13#include <linux/of.h>14 15#include <asm/octeon/octeon.h>16 17#include "spi-cavium.h"18 19static int octeon_spi_probe(struct platform_device *pdev)20{21 void __iomem *reg_base;22 struct spi_controller *host;23 struct octeon_spi *p;24 int err = -ENOENT;25 26 host = spi_alloc_host(&pdev->dev, sizeof(struct octeon_spi));27 if (!host)28 return -ENOMEM;29 p = spi_controller_get_devdata(host);30 platform_set_drvdata(pdev, host);31 32 reg_base = devm_platform_ioremap_resource(pdev, 0);33 if (IS_ERR(reg_base)) {34 err = PTR_ERR(reg_base);35 goto fail;36 }37 38 p->register_base = reg_base;39 p->sys_freq = octeon_get_io_clock_rate();40 41 p->regs.config = 0;42 p->regs.status = 0x08;43 p->regs.tx = 0x10;44 p->regs.data = 0x80;45 46 host->num_chipselect = 4;47 host->mode_bits = SPI_CPHA |48 SPI_CPOL |49 SPI_CS_HIGH |50 SPI_LSB_FIRST |51 SPI_3WIRE;52 53 host->transfer_one_message = octeon_spi_transfer_one_message;54 host->bits_per_word_mask = SPI_BPW_MASK(8);55 host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;56 57 host->dev.of_node = pdev->dev.of_node;58 err = devm_spi_register_controller(&pdev->dev, host);59 if (err) {60 dev_err(&pdev->dev, "register host failed: %d\n", err);61 goto fail;62 }63 64 dev_info(&pdev->dev, "OCTEON SPI bus driver\n");65 66 return 0;67fail:68 spi_controller_put(host);69 return err;70}71 72static void octeon_spi_remove(struct platform_device *pdev)73{74 struct spi_controller *host = platform_get_drvdata(pdev);75 struct octeon_spi *p = spi_controller_get_devdata(host);76 77 /* Clear the CSENA* and put everything in a known state. */78 writeq(0, p->register_base + OCTEON_SPI_CFG(p));79}80 81static const struct of_device_id octeon_spi_match[] = {82 { .compatible = "cavium,octeon-3010-spi", },83 {},84};85MODULE_DEVICE_TABLE(of, octeon_spi_match);86 87static struct platform_driver octeon_spi_driver = {88 .driver = {89 .name = "spi-octeon",90 .of_match_table = octeon_spi_match,91 },92 .probe = octeon_spi_probe,93 .remove_new = octeon_spi_remove,94};95 96module_platform_driver(octeon_spi_driver);97 98MODULE_DESCRIPTION("Cavium, Inc. OCTEON SPI bus driver");99MODULE_AUTHOR("David Daney");100MODULE_LICENSE("GPL");101