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
31static 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	base = devm_ioremap_resource(&pdev->dev, res);
42	if (IS_ERR(base))
43		return PTR_ERR(base);
44
45	cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);
46
47	cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
48	cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);
49
50#ifdef __BIG_ENDIAN
51	cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
52	cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
53#else
54	cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
55	cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
56#endif
57
58	cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;
59
60	cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);
61
62	if (!node) {
63		dev_err(dev, "no device node, failed to add octeon sata\n");
64		return -ENODEV;
65	}
66
67	ret = of_platform_populate(node, NULL, NULL, dev);
68	if (ret) {
69		dev_err(dev, "failed to add ahci-platform core\n");
70		return ret;
71	}
72
73	return 0;
74}
75
76static int ahci_octeon_remove(struct platform_device *pdev)
77{
78	return 0;
79}
80
81static const struct of_device_id octeon_ahci_match[] = {
82	{ .compatible = "cavium,octeon-7130-sata-uctl", },
83	{},
84};
85MODULE_DEVICE_TABLE(of, octeon_ahci_match);
86
87static struct platform_driver ahci_octeon_driver = {
88	.probe          = ahci_octeon_probe,
89	.remove         = ahci_octeon_remove,
90	.driver         = {
91		.name   = "octeon-ahci",
92		.of_match_table = octeon_ahci_match,
93	},
94};
95
96module_platform_driver(ahci_octeon_driver);
97
98MODULE_LICENSE("GPL");
99MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
100MODULE_DESCRIPTION("Cavium Inc. sata config.");
101