tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/* SATA PHY Control Register offset from AHCI base */
20#define SATA_P0PHYCR_REG 0x178
21
22#define SATA_PHY_MPY(x) ((x) << 0)
23#define SATA_PHY_LOS(x) ((x) << 6)
24#define SATA_PHY_RXCDR(x) ((x) << 10)
25#define SATA_PHY_RXEQ(x) ((x) << 13)
26#define SATA_PHY_TXSWING(x) ((x) << 19)
27#define SATA_PHY_ENPLL(x) ((x) << 31)
28
29/*
30 * The multiplier needed for 1.5GHz PLL output.
31 *
32 * NOTE: This is currently hardcoded to be suitable for 100MHz crystal
33 * frequency (which is used by DA850 EVM board) and may need to be changed
34 * if you would like to use this driver on some other board.
35 */
36#define DA850_SATA_CLK_MULTIPLIER 7
37
38static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
39 void __iomem *ahci_base)
40{
41 unsigned int val;
42
43 /* Enable SATA clock receiver */
44 val = readl(pwrdn_reg);
45 val &= ~BIT(0);
46 writel(val, pwrdn_reg);
47
48 val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
49 SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
50 SATA_PHY_ENPLL(1);
51
52 writel(val, ahci_base + SATA_P0PHYCR_REG);
53}
54
55static const struct ata_port_info ahci_da850_port_info = {
56 .flags = AHCI_FLAG_COMMON,
57 .pio_mask = ATA_PIO4,
58 .udma_mask = ATA_UDMA6,
59 .port_ops = &ahci_platform_ops,
60};
61
62static int ahci_da850_probe(struct platform_device *pdev)
63{
64 struct device *dev = &pdev->dev;
65 struct ahci_host_priv *hpriv;
66 struct resource *res;
67 void __iomem *pwrdn_reg;
68 int rc;
69
70 hpriv = ahci_platform_get_resources(pdev);
71 if (IS_ERR(hpriv))
72 return PTR_ERR(hpriv);
73
74 rc = ahci_platform_enable_resources(hpriv);
75 if (rc)
76 return rc;
77
78 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
79 if (!res)
80 goto disable_resources;
81
82 pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
83 if (!pwrdn_reg)
84 goto disable_resources;
85
86 da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
87
88 rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info);
89 if (rc)
90 goto disable_resources;
91
92 return 0;
93disable_resources:
94 ahci_platform_disable_resources(hpriv);
95 return rc;
96}
97
98static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
99 ahci_platform_resume);
100
101static struct platform_driver ahci_da850_driver = {
102 .probe = ahci_da850_probe,
103 .remove = ata_platform_remove_one,
104 .driver = {
105 .name = "ahci_da850",
106 .owner = THIS_MODULE,
107 .pm = &ahci_da850_pm_ops,
108 },
109};
110module_platform_driver(ahci_da850_driver);
111
112MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
113MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
114MODULE_LICENSE("GPL");