xref: /openbmc/linux/drivers/ata/ahci_octeon.c (revision 0edbfea5)
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.");
106