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
ahci_octeon_probe(struct platform_device * pdev)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, 0);
39 if (IS_ERR(base))
40 return PTR_ERR(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(node, NULL, NULL, 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