/*
 * 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_controller *host;
        struct octeon_spi *p;
        int err = -ENOENT;

        host = devm_spi_alloc_host(&pdev->dev, sizeof(struct octeon_spi));
        if (!host)
                return -ENOMEM;
        p = spi_controller_get_devdata(host);
        platform_set_drvdata(pdev, host);

        reg_base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(reg_base))
                return PTR_ERR(reg_base);

        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;

        host->num_chipselect = 4;
        host->mode_bits = SPI_CPHA |
                            SPI_CPOL |
                            SPI_CS_HIGH |
                            SPI_LSB_FIRST |
                            SPI_3WIRE;

        host->transfer_one_message = octeon_spi_transfer_one_message;
        host->bits_per_word_mask = SPI_BPW_MASK(8);
        host->max_speed_hz = OCTEON_SPI_MAX_CLOCK_HZ;

        err = spi_register_controller(host);
        if (err) {
                dev_err(&pdev->dev, "register host failed: %d\n", err);
                return err;
        }

        dev_info(&pdev->dev, "OCTEON SPI bus driver\n");

        return 0;
}

static void octeon_spi_remove(struct platform_device *pdev)
{
        struct spi_controller *host = platform_get_drvdata(pdev);
        struct octeon_spi *p = spi_controller_get_devdata(host);

        spi_unregister_controller(host);

        /* Clear the CSENA* and put everything in a known state. */
        writeq(0, p->register_base + OCTEON_SPI_CFG(p));
}

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");