1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* DaVinci DA850 AHCI SATA platform driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include "ahci.h"
#define DRV_NAME "ahci_da850"
/* SATA PHY Control Register offset from AHCI base */
#define SATA_P0PHYCR_REG 0x178
#define SATA_PHY_MPY(x) ((x) << 0)
#define SATA_PHY_LOS(x) ((x) << 6)
#define SATA_PHY_RXCDR(x) ((x) << 10)
#define SATA_PHY_RXEQ(x) ((x) << 13)
#define SATA_PHY_TXSWING(x) ((x) << 19)
#define SATA_PHY_ENPLL(x) ((x) << 31)
/*
* The multiplier needed for 1.5GHz PLL output.
*
* NOTE: This is currently hardcoded to be suitable for 100MHz crystal
* frequency (which is used by DA850 EVM board) and may need to be changed
* if you would like to use this driver on some other board.
*/
#define DA850_SATA_CLK_MULTIPLIER 7
static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
void __iomem *ahci_base)
{
unsigned int val;
/* Enable SATA clock receiver */
val = readl(pwrdn_reg);
val &= ~BIT(0);
writel(val, pwrdn_reg);
val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
SATA_PHY_ENPLL(1);
writel(val, ahci_base + SATA_P0PHYCR_REG);
}
static const struct ata_port_info ahci_da850_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int ahci_da850_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct resource *res;
void __iomem *pwrdn_reg;
struct clk *clk;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
/*
* Internally ahci_platform_get_resources() calls clk_get(dev, NULL)
* when trying to obtain the functional clock. This SATA controller
* uses two clocks for which we specify two connection ids. If we don't
* have the functional clock at this point - call clk_get() again with
* con_id = "fck".
*/
if (!hpriv->clks[0]) {
clk = clk_get(dev, "fck");
if (IS_ERR(clk))
return PTR_ERR(clk);
hpriv->clks[0] = clk;
}
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
goto disable_resources;
pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
if (!pwrdn_reg)
goto disable_resources;
da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
&ahci_platform_sht);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
ahci_platform_resume);
static const struct of_device_id ahci_da850_of_match[] = {
{ .compatible = "ti,da850-ahci", },
{ },
};
MODULE_DEVICE_TABLE(of, ahci_da850_of_match);
static struct platform_driver ahci_da850_driver = {
.probe = ahci_da850_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_da850_of_match,
.pm = &ahci_da850_pm_ops,
},
};
module_platform_driver(ahci_da850_driver);
MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
MODULE_LICENSE("GPL");
|
