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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* AHCI glue platform driver for Marvell EBU SOCs
*
* Copyright (C) 2014 Marvell
*
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
* Marcin Wojtas <mw@semihalf.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/ahci_platform.h>
#include <linux/kernel.h>
#include <linux/mbus.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include "ahci.h"
#define DRV_NAME "ahci-mvebu"
#define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0
#define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4
#define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4))
#define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4))
#define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4))
static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
const struct mbus_dram_target_info *dram)
{
int i;
for (i = 0; i < 4; i++) {
writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
}
for (i = 0; i < dram->num_cs; i++) {
const struct mbus_dram_window *cs = dram->cs + i;
writel((cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) | 1,
hpriv->mmio + AHCI_WINDOW_CTRL(i));
writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
writel(((cs->size - 1) & 0xffff0000),
hpriv->mmio + AHCI_WINDOW_SIZE(i));
}
}
static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
{
/*
* Enable the regret bit to allow the SATA unit to regret a
* request that didn't receive an acknowlegde and avoid a
* deadlock
*/
writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
}
/**
* ahci_mvebu_stop_engine
*
* @ap: Target ata port
*
* Errata Ref#226 - SATA Disk HOT swap issue when connected through
* Port Multiplier in FIS-based Switching mode.
*
* To avoid the issue, according to design, the bits[11:8, 0] of
* register PxFBS are cleared when Port Command and Status (0x18) bit[0]
* changes its value from 1 to 0, i.e. falling edge of Port
* Command and Status bit[0] sends PULSE that resets PxFBS
* bits[11:8; 0].
*
* This function is used to override function of "ahci_stop_engine"
* from libahci.c by adding the mvebu work around(WA) to save PxFBS
* value before the PxCMD ST write of 0, then restore PxFBS value.
*
* Return: 0 on success; Error code otherwise.
*/
static int ahci_mvebu_stop_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp, port_fbs;
tmp = readl(port_mmio + PORT_CMD);
/* check if the HBA is idle */
if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
return 0;
/* save the port PxFBS register for later restore */
port_fbs = readl(port_mmio + PORT_FBS);
/* setting HBA to idle */
tmp &= ~PORT_CMD_START;
writel(tmp, port_mmio + PORT_CMD);
/*
* bit #15 PxCMD signal doesn't clear PxFBS,
* restore the PxFBS register right after clearing the PxCMD ST,
* no need to wait for the PxCMD bit #15.
*/
writel(port_fbs, port_mmio + PORT_FBS);
/* wait for engine to stop. This could be as long as 500 msec */
tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
if (tmp & PORT_CMD_LIST_ON)
return -EIO;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state)
{
return ahci_platform_suspend_host(&pdev->dev);
}
static int ahci_mvebu_resume(struct platform_device *pdev)
{
struct ata_host *host = platform_get_drvdata(pdev);
struct ahci_host_priv *hpriv = host->private_data;
const struct mbus_dram_target_info *dram;
dram = mv_mbus_dram_info();
if (dram)
ahci_mvebu_mbus_config(hpriv, dram);
ahci_mvebu_regret_option(hpriv);
return ahci_platform_resume_host(&pdev->dev);
}
#else
#define ahci_mvebu_suspend NULL
#define ahci_mvebu_resume NULL
#endif
static const struct ata_port_info ahci_mvebu_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_mvebu_probe(struct platform_device *pdev)
{
struct ahci_host_priv *hpriv;
const struct mbus_dram_target_info *dram;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;
hpriv->stop_engine = ahci_mvebu_stop_engine;
if (of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-380-ahci")) {
dram = mv_mbus_dram_info();
if (!dram)
return -ENODEV;
ahci_mvebu_mbus_config(hpriv, dram);
ahci_mvebu_regret_option(hpriv);
}
rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
&ahci_platform_sht);
if (rc)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return rc;
}
static const struct of_device_id ahci_mvebu_of_match[] = {
{ .compatible = "marvell,armada-380-ahci", },
{ .compatible = "marvell,armada-3700-ahci", },
{ },
};
MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
/*
* We currently don't provide power management related operations,
* since there is no suspend/resume support at the platform level for
* Armada 38x for the moment.
*/
static struct platform_driver ahci_mvebu_driver = {
.probe = ahci_mvebu_probe,
.remove = ata_platform_remove_one,
.suspend = ahci_mvebu_suspend,
.resume = ahci_mvebu_resume,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_mvebu_of_match,
},
};
module_platform_driver(ahci_mvebu_driver);
MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ahci_mvebu");
|
