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a3464ed2 TP |
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 AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0 | |
23 | #define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4 | |
24 | ||
25 | #define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4)) | |
26 | #define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4)) | |
27 | #define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4)) | |
28 | ||
29 | static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv, | |
30 | const struct mbus_dram_target_info *dram) | |
31 | { | |
32 | int i; | |
33 | ||
34 | for (i = 0; i < 4; i++) { | |
35 | writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i)); | |
36 | writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i)); | |
37 | writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i)); | |
38 | } | |
39 | ||
40 | for (i = 0; i < dram->num_cs; i++) { | |
41 | const struct mbus_dram_window *cs = dram->cs + i; | |
42 | ||
43 | writel((cs->mbus_attr << 8) | | |
44 | (dram->mbus_dram_target_id << 4) | 1, | |
45 | hpriv->mmio + AHCI_WINDOW_CTRL(i)); | |
46 | writel(cs->base, hpriv->mmio + AHCI_WINDOW_BASE(i)); | |
47 | writel(((cs->size - 1) & 0xffff0000), | |
48 | hpriv->mmio + AHCI_WINDOW_SIZE(i)); | |
49 | } | |
50 | } | |
51 | ||
52 | static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv) | |
53 | { | |
54 | /* | |
55 | * Enable the regret bit to allow the SATA unit to regret a | |
56 | * request that didn't receive an acknowlegde and avoid a | |
57 | * deadlock | |
58 | */ | |
59 | writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR); | |
60 | writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA); | |
61 | } | |
62 | ||
63 | static const struct ata_port_info ahci_mvebu_port_info = { | |
64 | .flags = AHCI_FLAG_COMMON, | |
65 | .pio_mask = ATA_PIO4, | |
66 | .udma_mask = ATA_UDMA6, | |
67 | .port_ops = &ahci_platform_ops, | |
68 | }; | |
69 | ||
70 | static int ahci_mvebu_probe(struct platform_device *pdev) | |
71 | { | |
72 | struct ahci_host_priv *hpriv; | |
73 | const struct mbus_dram_target_info *dram; | |
74 | int rc; | |
75 | ||
76 | hpriv = ahci_platform_get_resources(pdev); | |
77 | if (IS_ERR(hpriv)) | |
78 | return PTR_ERR(hpriv); | |
79 | ||
80 | rc = ahci_platform_enable_resources(hpriv); | |
81 | if (rc) | |
82 | return rc; | |
83 | ||
84 | dram = mv_mbus_dram_info(); | |
85 | if (!dram) | |
86 | return -ENODEV; | |
87 | ||
88 | ahci_mvebu_mbus_config(hpriv, dram); | |
89 | ahci_mvebu_regret_option(hpriv); | |
90 | ||
725c7b57 | 91 | rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info); |
a3464ed2 TP |
92 | if (rc) |
93 | goto disable_resources; | |
94 | ||
95 | return 0; | |
96 | ||
97 | disable_resources: | |
98 | ahci_platform_disable_resources(hpriv); | |
99 | return rc; | |
100 | } | |
101 | ||
102 | static const struct of_device_id ahci_mvebu_of_match[] = { | |
103 | { .compatible = "marvell,armada-380-ahci", }, | |
104 | { }, | |
105 | }; | |
106 | MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match); | |
107 | ||
108 | /* | |
109 | * We currently don't provide power management related operations, | |
110 | * since there is no suspend/resume support at the platform level for | |
111 | * Armada 38x for the moment. | |
112 | */ | |
113 | static struct platform_driver ahci_mvebu_driver = { | |
114 | .probe = ahci_mvebu_probe, | |
115 | .remove = ata_platform_remove_one, | |
116 | .driver = { | |
117 | .name = "ahci-mvebu", | |
118 | .owner = THIS_MODULE, | |
119 | .of_match_table = ahci_mvebu_of_match, | |
120 | }, | |
121 | }; | |
122 | module_platform_driver(ahci_mvebu_driver); | |
123 | ||
124 | MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver"); | |
125 | MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>"); | |
126 | MODULE_LICENSE("GPL"); | |
127 | MODULE_ALIAS("platform:ahci_mvebu"); |