tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * AHCI glue platform driver for Marvell EBU SOCs
3 *
4 * Copyright (C) 2014 Marvell
5 *
6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 * Marcin Wojtas <mw@semihalf.com>
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14#include <linux/ahci_platform.h>
15#include <linux/kernel.h>
16#include <linux/mbus.h>
17#include <linux/module.h>
18#include <linux/of_device.h>
19#include <linux/platform_device.h>
20#include "ahci.h"
21
22#define DRV_NAME "ahci-mvebu"
23
24#define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0
25#define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4
26
27#define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4))
28#define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4))
29#define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4))
30
31static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
32 const struct mbus_dram_target_info *dram)
33{
34 int i;
35
36 for (i = 0; i < 4; i++) {
37 writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
38 writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
39 writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
40 }
41
42 for (i = 0; i < dram->num_cs; i++) {
43 const struct mbus_dram_window *cs = dram->cs + i;
44
45 writel((cs->mbus_attr << 8) |
46 (dram->mbus_dram_target_id << 4) | 1,
47 hpriv->mmio + AHCI_WINDOW_CTRL(i));
48 writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
49 writel(((cs->size - 1) & 0xffff0000),
50 hpriv->mmio + AHCI_WINDOW_SIZE(i));
51 }
52}
53
54static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
55{
56 /*
57 * Enable the regret bit to allow the SATA unit to regret a
58 * request that didn't receive an acknowlegde and avoid a
59 * deadlock
60 */
61 writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
62 writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
63}
64
65#ifdef CONFIG_PM_SLEEP
66static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state)
67{
68 return ahci_platform_suspend_host(&pdev->dev);
69}
70
71static int ahci_mvebu_resume(struct platform_device *pdev)
72{
73 struct ata_host *host = platform_get_drvdata(pdev);
74 struct ahci_host_priv *hpriv = host->private_data;
75 const struct mbus_dram_target_info *dram;
76
77 dram = mv_mbus_dram_info();
78 if (dram)
79 ahci_mvebu_mbus_config(hpriv, dram);
80
81 ahci_mvebu_regret_option(hpriv);
82
83 return ahci_platform_resume_host(&pdev->dev);
84}
85#else
86#define ahci_mvebu_suspend NULL
87#define ahci_mvebu_resume NULL
88#endif
89
90static const struct ata_port_info ahci_mvebu_port_info = {
91 .flags = AHCI_FLAG_COMMON,
92 .pio_mask = ATA_PIO4,
93 .udma_mask = ATA_UDMA6,
94 .port_ops = &ahci_platform_ops,
95};
96
97static struct scsi_host_template ahci_platform_sht = {
98 AHCI_SHT(DRV_NAME),
99};
100
101static int ahci_mvebu_probe(struct platform_device *pdev)
102{
103 struct ahci_host_priv *hpriv;
104 const struct mbus_dram_target_info *dram;
105 int rc;
106
107 hpriv = ahci_platform_get_resources(pdev);
108 if (IS_ERR(hpriv))
109 return PTR_ERR(hpriv);
110
111 rc = ahci_platform_enable_resources(hpriv);
112 if (rc)
113 return rc;
114
115 if (of_device_is_compatible(pdev->dev.of_node,
116 "marvell,armada-380-ahci")) {
117 dram = mv_mbus_dram_info();
118 if (!dram)
119 return -ENODEV;
120
121 ahci_mvebu_mbus_config(hpriv, dram);
122 ahci_mvebu_regret_option(hpriv);
123 }
124
125 rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
126 &ahci_platform_sht);
127 if (rc)
128 goto disable_resources;
129
130 return 0;
131
132disable_resources:
133 ahci_platform_disable_resources(hpriv);
134 return rc;
135}
136
137static const struct of_device_id ahci_mvebu_of_match[] = {
138 { .compatible = "marvell,armada-380-ahci", },
139 { .compatible = "marvell,armada-3700-ahci", },
140 { },
141};
142MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
143
144/*
145 * We currently don't provide power management related operations,
146 * since there is no suspend/resume support at the platform level for
147 * Armada 38x for the moment.
148 */
149static struct platform_driver ahci_mvebu_driver = {
150 .probe = ahci_mvebu_probe,
151 .remove = ata_platform_remove_one,
152 .suspend = ahci_mvebu_suspend,
153 .resume = ahci_mvebu_resume,
154 .driver = {
155 .name = DRV_NAME,
156 .of_match_table = ahci_mvebu_of_match,
157 },
158};
159module_platform_driver(ahci_mvebu_driver);
160
161MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
162MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
163MODULE_LICENSE("GPL");
164MODULE_ALIAS("platform:ahci_mvebu");