Quelle  ahci_octeon.c   Sprache: C

/*
 * 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. ");
MODULE_DESCRIPTION("Cavium Inc. sata config.");