| Aleksey Makarov | a2127e4 | 2016-02-11 13:53:08 +0000 | [diff] [blame] | 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."); |