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 | |
20 | #define CVMX_SATA_UCTL_SHIM_CFG 0xE8 |
21 | |
22 | #define SATA_UCTL_ENDIAN_MODE_BIG 1 |
23 | #define SATA_UCTL_ENDIAN_MODE_LITTLE 0 |
24 | #define SATA_UCTL_ENDIAN_MODE_MASK 3 |
25 | |
26 | #define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8 |
27 | #define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0 |
28 | #define SATA_UCTL_DMA_READ_CMD_SHIFT 12 |
29 | |
30 | static int ahci_octeon_probe(struct platform_device *pdev) |
31 | { |
32 | struct device *dev = &pdev->dev; |
33 | struct device_node *node = dev->of_node; |
34 | void __iomem *base; |
35 | u64 cfg; |
36 | int ret; |
37 | |
38 | base = devm_platform_ioremap_resource(pdev, index: 0); |
39 | if (IS_ERR(ptr: base)) |
40 | return PTR_ERR(ptr: base); |
41 | |
42 | cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG); |
43 | |
44 | cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT); |
45 | cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT); |
46 | |
47 | #ifdef __BIG_ENDIAN |
48 | cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; |
49 | cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; |
50 | #else |
51 | cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT; |
52 | cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT; |
53 | #endif |
54 | |
55 | cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT; |
56 | |
57 | cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg); |
58 | |
59 | if (!node) { |
60 | dev_err(dev, "no device node, failed to add octeon sata\n" ); |
61 | return -ENODEV; |
62 | } |
63 | |
64 | ret = of_platform_populate(root: node, NULL, NULL, parent: dev); |
65 | if (ret) { |
66 | dev_err(dev, "failed to add ahci-platform core\n" ); |
67 | return ret; |
68 | } |
69 | |
70 | return 0; |
71 | } |
72 | |
73 | static const struct of_device_id octeon_ahci_match[] = { |
74 | { .compatible = "cavium,octeon-7130-sata-uctl" , }, |
75 | { /* sentinel */ } |
76 | }; |
77 | MODULE_DEVICE_TABLE(of, octeon_ahci_match); |
78 | |
79 | static struct platform_driver ahci_octeon_driver = { |
80 | .probe = ahci_octeon_probe, |
81 | .driver = { |
82 | .name = "octeon-ahci" , |
83 | .of_match_table = octeon_ahci_match, |
84 | }, |
85 | }; |
86 | |
87 | module_platform_driver(ahci_octeon_driver); |
88 | |
89 | MODULE_LICENSE("GPL" ); |
90 | MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>" ); |
91 | MODULE_DESCRIPTION("Cavium Inc. sata config." ); |
92 | |