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         if (!res) {
  42                 dev_err(&pdev->dev, "Platform resource[0] is missing\n");
  43                 return -ENODEV;
  44         }
  45
  46         base = devm_ioremap_resource(&pdev->dev, res);
  47         if (IS_ERR(base))
  48                 return PTR_ERR(base);
  49
  50         cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);
  51
  52         cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
  53         cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);
  54
  55 #ifdef __BIG_ENDIAN
  56         cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
  57         cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
  58 #else
  59         cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
  60         cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
  61 #endif
  62
  63         cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;
  64
  65         cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);
  66
  67         if (!node) {
  68                 dev_err(dev, "no device node, failed to add octeon sata\n");
  69                 return -ENODEV;
  70         }
  71
  72         ret = of_platform_populate(node, NULL, NULL, dev);
  73         if (ret) {
  74                 dev_err(dev, "failed to add ahci-platform core\n");
  75                 return ret;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int ahci_octeon_remove(struct platform_device *pdev)
  82 {
  83         return 0;
  84 }
  85
  86 static const struct of_device_id octeon_ahci_match[] = {
  87         { .compatible = "cavium,octeon-7130-sata-uctl", },
  88         {},
  89 };
  90 MODULE_DEVICE_TABLE(of, octeon_ahci_match);
  91
  92 static struct platform_driver ahci_octeon_driver = {
  93         .probe          = ahci_octeon_probe,
  94         .remove         = ahci_octeon_remove,
  95         .driver         = {
  96                 .name   = "octeon-ahci",
  97                 .of_match_table = octeon_ahci_match,
  98         },
  99 };
 100
 101 module_platform_driver(ahci_octeon_driver);
 102
 103 MODULE_LICENSE("GPL");
 104 MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
 105 MODULE_DESCRIPTION("Cavium Inc. sata config.");