drivers/ata/ahci_octeon.c

   1 /*
   2  * SATA glue for Cavium Octeon III SOCs.
   3  *
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * Copyright (C) 2010-2015 Cavium Networks
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/of_platform.h>
  17
  18 #include <asm/octeon/octeon.h>
  19 #include <asm/bitfield.h>
  20
  21 #define CVMX_SATA_UCTL_SHIM_CFG         0xE8
  22
  23 #define SATA_UCTL_ENDIAN_MODE_BIG       1
  24 #define SATA_UCTL_ENDIAN_MODE_LITTLE    0
  25 #define SATA_UCTL_ENDIAN_MODE_MASK      3
  26
  27 #define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8
  28 #define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0
  29 #define SATA_UCTL_DMA_READ_CMD_SHIFT    12
  30
  31 static int ahci_octeon_probe(struct platform_device *pdev)
  32 {
  33         struct device *dev = &pdev->dev;
  34         struct device_node *node = dev->of_node;
  35         struct resource *res;
  36         void __iomem *base;
  37         u64 cfg;
  38         int ret;
  39
  40         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  41         base = devm_ioremap_resource(&pdev->dev, res);
  42         if (IS_ERR(base))
  43                 return PTR_ERR(base);
  44
  45         cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);
  46
  47         cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
  48         cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);
  49
  50 #ifdef __BIG_ENDIAN
  51         cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
  52         cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
  53 #else
  54         cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
  55         cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
  56 #endif
  57
  58         cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;
  59
  60         cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);
  61
  62         if (!node) {
  63                 dev_err(dev, "no device node, failed to add octeon sata\n");
  64                 return -ENODEV;
  65         }
  66
  67         ret = of_platform_populate(node, NULL, NULL, dev);
  68         if (ret) {
  69                 dev_err(dev, "failed to add ahci-platform core\n");
  70                 return ret;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int ahci_octeon_remove(struct platform_device *pdev)
  77 {
  78         return 0;
  79 }
  80
  81 static const struct of_device_id octeon_ahci_match[] = {
  82         { .compatible = "cavium,octeon-7130-sata-uctl", },
  83         { /* sentinel */ }
  84 };
  85 MODULE_DEVICE_TABLE(of, octeon_ahci_match);
  86
  87 static struct platform_driver ahci_octeon_driver = {
  88         .probe          = ahci_octeon_probe,
  89         .remove         = ahci_octeon_remove,
  90         .driver         = {
  91                 .name   = "octeon-ahci",
  92                 .of_match_table = octeon_ahci_match,
  93         },
  94 };
  95
  96 module_platform_driver(ahci_octeon_driver);
  97
  98 MODULE_LICENSE("GPL");
  99 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
 100 MODULE_DESCRIPTION("Cavium Inc. sata config.");