Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/ata/ahci_octeon.c
26278 views
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


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. <[email protected]>");

91
MODULE_DESCRIPTION("Cavium Inc. sata config.");

92


93