1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * SATA glue for Cavium Octeon III SOCs.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
6*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
7*4882a593Smuzhiyun * for more details.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Copyright (C) 2010-2015 Cavium Networks
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/dma-mapping.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/of_platform.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <asm/octeon/octeon.h>
19*4882a593Smuzhiyun #include <asm/bitfield.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define CVMX_SATA_UCTL_SHIM_CFG 0xE8
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun #define SATA_UCTL_ENDIAN_MODE_BIG 1
24*4882a593Smuzhiyun #define SATA_UCTL_ENDIAN_MODE_LITTLE 0
25*4882a593Smuzhiyun #define SATA_UCTL_ENDIAN_MODE_MASK 3
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT 8
28*4882a593Smuzhiyun #define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT 0
29*4882a593Smuzhiyun #define SATA_UCTL_DMA_READ_CMD_SHIFT 12
30*4882a593Smuzhiyun
ahci_octeon_probe(struct platform_device * pdev)31*4882a593Smuzhiyun static int ahci_octeon_probe(struct platform_device *pdev)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun struct device *dev = &pdev->dev;
34*4882a593Smuzhiyun struct device_node *node = dev->of_node;
35*4882a593Smuzhiyun struct resource *res;
36*4882a593Smuzhiyun void __iomem *base;
37*4882a593Smuzhiyun u64 cfg;
38*4882a593Smuzhiyun int ret;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
41*4882a593Smuzhiyun base = devm_ioremap_resource(&pdev->dev, res);
42*4882a593Smuzhiyun if (IS_ERR(base))
43*4882a593Smuzhiyun return PTR_ERR(base);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
48*4882a593Smuzhiyun cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun #ifdef __BIG_ENDIAN
51*4882a593Smuzhiyun cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
52*4882a593Smuzhiyun cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
53*4882a593Smuzhiyun #else
54*4882a593Smuzhiyun cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
55*4882a593Smuzhiyun cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
56*4882a593Smuzhiyun #endif
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun if (!node) {
63*4882a593Smuzhiyun dev_err(dev, "no device node, failed to add octeon sata\n");
64*4882a593Smuzhiyun return -ENODEV;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun ret = of_platform_populate(node, NULL, NULL, dev);
68*4882a593Smuzhiyun if (ret) {
69*4882a593Smuzhiyun dev_err(dev, "failed to add ahci-platform core\n");
70*4882a593Smuzhiyun return ret;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return 0;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
ahci_octeon_remove(struct platform_device * pdev)76*4882a593Smuzhiyun static int ahci_octeon_remove(struct platform_device *pdev)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static const struct of_device_id octeon_ahci_match[] = {
82*4882a593Smuzhiyun { .compatible = "cavium,octeon-7130-sata-uctl", },
83*4882a593Smuzhiyun {},
84*4882a593Smuzhiyun };
85*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, octeon_ahci_match);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static struct platform_driver ahci_octeon_driver = {
88*4882a593Smuzhiyun .probe = ahci_octeon_probe,
89*4882a593Smuzhiyun .remove = ahci_octeon_remove,
90*4882a593Smuzhiyun .driver = {
91*4882a593Smuzhiyun .name = "octeon-ahci",
92*4882a593Smuzhiyun .of_match_table = octeon_ahci_match,
93*4882a593Smuzhiyun },
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun module_platform_driver(ahci_octeon_driver);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun MODULE_LICENSE("GPL");
99*4882a593Smuzhiyun MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
100*4882a593Smuzhiyun MODULE_DESCRIPTION("Cavium Inc. sata config.");
101