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
30static 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
73static const struct of_device_id octeon_ahci_match[] = {
74	{ .compatible = "cavium,octeon-7130-sata-uctl", },
75	{ /* sentinel */ }
76};
77MODULE_DEVICE_TABLE(of, octeon_ahci_match);
78
79static 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
87module_platform_driver(ahci_octeon_driver);
88
89MODULE_LICENSE("GPL");
90MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
91MODULE_DESCRIPTION("Cavium Inc. sata config.");
92