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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* MediaTek AHCI SATA driver
*
* Copyright (c) 2017 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.com>
*/
#include <linux/ahci_platform.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "ahci.h"
#define DRV_NAME "ahci-mtk"
#define SYS_CFG 0x14
#define SYS_CFG_SATA_MSK GENMASK(31, 30)
#define SYS_CFG_SATA_EN BIT(31)
struct mtk_ahci_plat {
struct regmap *mode;
struct reset_control *axi_rst;
struct reset_control *sw_rst;
struct reset_control *reg_rst;
};
static const struct ata_port_info ahci_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static const struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct mtk_ahci_plat *plat = hpriv->plat_data;
int err;
/* reset AXI bus and PHY part */
plat->axi_rst = devm_reset_control_get_optional_exclusive(dev, "axi");
if (PTR_ERR(plat->axi_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->axi_rst);
plat->sw_rst = devm_reset_control_get_optional_exclusive(dev, "sw");
if (PTR_ERR(plat->sw_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->sw_rst);
plat->reg_rst = devm_reset_control_get_optional_exclusive(dev, "reg");
if (PTR_ERR(plat->reg_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->reg_rst);
err = reset_control_assert(plat->axi_rst);
if (err) {
dev_err(dev, "failed to assert AXI bus\n");
return err;
}
err = reset_control_assert(plat->sw_rst);
if (err) {
dev_err(dev, "failed to assert PHY digital part\n");
return err;
}
err = reset_control_assert(plat->reg_rst);
if (err) {
dev_err(dev, "failed to assert PHY register part\n");
return err;
}
err = reset_control_deassert(plat->reg_rst);
if (err) {
dev_err(dev, "failed to deassert PHY register part\n");
return err;
}
err = reset_control_deassert(plat->sw_rst);
if (err) {
dev_err(dev, "failed to deassert PHY digital part\n");
return err;
}
err = reset_control_deassert(plat->axi_rst);
if (err) {
dev_err(dev, "failed to deassert AXI bus\n");
return err;
}
return 0;
}
static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct mtk_ahci_plat *plat = hpriv->plat_data;
struct device_node *np = dev->of_node;
/* enable SATA function if needed */
if (of_property_present(np, "mediatek,phy-mode")) {
plat->mode = syscon_regmap_lookup_by_phandle(
np, "mediatek,phy-mode");
if (IS_ERR(plat->mode)) {
dev_err(dev, "missing phy-mode phandle\n");
return PTR_ERR(plat->mode);
}
regmap_update_bits(plat->mode, SYS_CFG, SYS_CFG_SATA_MSK,
SYS_CFG_SATA_EN);
}
return 0;
}
static int mtk_ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_ahci_plat *plat;
struct ahci_host_priv *hpriv;
int err;
plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
if (!plat)
return -ENOMEM;
hpriv = ahci_platform_get_resources(pdev, 0);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
hpriv->plat_data = plat;
err = mtk_ahci_parse_property(hpriv, dev);
if (err)
return err;
err = mtk_ahci_platform_resets(hpriv, dev);
if (err)
return err;
err = ahci_platform_enable_resources(hpriv);
if (err)
return err;
err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
&ahci_platform_sht);
if (err)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return err;
}
static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
ahci_platform_resume);
static const struct of_device_id ahci_of_match[] = {
{ .compatible = "mediatek,mtk-ahci", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ahci_of_match);
static struct platform_driver mtk_ahci_driver = {
.probe = mtk_ahci_probe,
.remove_new = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_of_match,
.pm = &ahci_pm_ops,
},
};
module_platform_driver(mtk_ahci_driver);
MODULE_DESCRIPTION("MediaTek SATA AHCI Driver");
MODULE_LICENSE("GPL v2");
|
