/*
 * SATA glue for Cavium Octeon III SOCs.
 *
 *
 * 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) 2010-2015 Cavium Networks
 *
 */

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>

#include <asm/octeon/octeon.h>

#define CVMX_SATA_UCTL_SHIM_CFG         0xE8

#define SATA_UCTL_ENDIAN_MODE_BIG       1
#define SATA_UCTL_ENDIAN_MODE_LITTLE    0
#define SATA_UCTL_ENDIAN_MODE_MASK      3

#define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8
#define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0
#define SATA_UCTL_DMA_READ_CMD_SHIFT    12

static int ahci_octeon_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *node = dev->of_node;
        void __iomem *base;
        u64 cfg;
        int ret;

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

        cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);

        cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
        cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);

#ifdef __BIG_ENDIAN
        cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
        cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
#else
        cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
        cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
#endif

        cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;

        cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);

        if (!node) {
                dev_err(dev, "no device node, failed to add octeon sata\n");
                return -ENODEV;
        }

        ret = of_platform_populate(node, NULL, NULL, dev);
        if (ret) {
                dev_err(dev, "failed to add ahci-platform core\n");
                return ret;
        }

        return 0;
}

static const struct of_device_id octeon_ahci_match[] = {
        { .compatible = "cavium,octeon-7130-sata-uctl", },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, octeon_ahci_match);

static struct platform_driver ahci_octeon_driver = {
        .probe          = ahci_octeon_probe,
        .driver         = {
                .name   = "octeon-ahci",
                .of_match_table = octeon_ahci_match,
        },
};

module_platform_driver(ahci_octeon_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
MODULE_DESCRIPTION("Cavium Inc. sata config.");