1/*
2 * DaVinci DA850 AHCI SATA platform driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
7 * any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/pm.h>
13#include <linux/device.h>
14#include <linux/platform_device.h>
15#include <linux/libata.h>
16#include <linux/ahci_platform.h>
17#include "ahci.h"
18
19#define DRV_NAME "ahci_da850"
20
21/* SATA PHY Control Register offset from AHCI base */
22#define SATA_P0PHYCR_REG	0x178
23
24#define SATA_PHY_MPY(x)		((x) << 0)
25#define SATA_PHY_LOS(x)		((x) << 6)
26#define SATA_PHY_RXCDR(x)	((x) << 10)
27#define SATA_PHY_RXEQ(x)	((x) << 13)
28#define SATA_PHY_TXSWING(x)	((x) << 19)
29#define SATA_PHY_ENPLL(x)	((x) << 31)
30
31/*
32 * The multiplier needed for 1.5GHz PLL output.
33 *
34 * NOTE: This is currently hardcoded to be suitable for 100MHz crystal
35 * frequency (which is used by DA850 EVM board) and may need to be changed
36 * if you would like to use this driver on some other board.
37 */
38#define DA850_SATA_CLK_MULTIPLIER	7
39
40static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
41			    void __iomem *ahci_base)
42{
43	unsigned int val;
44
45	/* Enable SATA clock receiver */
46	val = readl(pwrdn_reg);
47	val &= ~BIT(0);
48	writel(val, pwrdn_reg);
49
50	val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
51	      SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
52	      SATA_PHY_ENPLL(1);
53
54	writel(val, ahci_base + SATA_P0PHYCR_REG);
55}
56
57static const struct ata_port_info ahci_da850_port_info = {
58	.flags		= AHCI_FLAG_COMMON,
59	.pio_mask	= ATA_PIO4,
60	.udma_mask	= ATA_UDMA6,
61	.port_ops	= &ahci_platform_ops,
62};
63
64static struct scsi_host_template ahci_platform_sht = {
65	AHCI_SHT(DRV_NAME),
66};
67
68static int ahci_da850_probe(struct platform_device *pdev)
69{
70	struct device *dev = &pdev->dev;
71	struct ahci_host_priv *hpriv;
72	struct resource *res;
73	void __iomem *pwrdn_reg;
74	int rc;
75
76	hpriv = ahci_platform_get_resources(pdev);
77	if (IS_ERR(hpriv))
78		return PTR_ERR(hpriv);
79
80	rc = ahci_platform_enable_resources(hpriv);
81	if (rc)
82		return rc;
83
84	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
85	if (!res)
86		goto disable_resources;
87
88	pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
89	if (!pwrdn_reg)
90		goto disable_resources;
91
92	da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
93
94	rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
95				     &ahci_platform_sht);
96	if (rc)
97		goto disable_resources;
98
99	return 0;
100disable_resources:
101	ahci_platform_disable_resources(hpriv);
102	return rc;
103}
104
105static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
106			 ahci_platform_resume);
107
108static struct platform_driver ahci_da850_driver = {
109	.probe = ahci_da850_probe,
110	.remove = ata_platform_remove_one,
111	.driver = {
112		.name = DRV_NAME,
113		.pm = &ahci_da850_pm_ops,
114	},
115};
116module_platform_driver(ahci_da850_driver);
117
118MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
119MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
120MODULE_LICENSE("GPL");
121