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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
82aa0387 HG |
2 | #include <linux/usb.h> |
3 | #include <linux/usb/hcd.h> | |
97172a66 | 4 | #include "usb.h" |
82aa0387 HG |
5 | |
6 | static int uas_is_interface(struct usb_host_interface *intf) | |
7 | { | |
8 | return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && | |
9 | intf->desc.bInterfaceSubClass == USB_SC_SCSI && | |
10 | intf->desc.bInterfaceProtocol == USB_PR_UAS); | |
11 | } | |
12 | ||
786de92b AS |
13 | static struct usb_host_interface *uas_find_uas_alt_setting( |
14 | struct usb_interface *intf) | |
82aa0387 HG |
15 | { |
16 | int i; | |
82aa0387 HG |
17 | |
18 | for (i = 0; i < intf->num_altsetting; i++) { | |
19 | struct usb_host_interface *alt = &intf->altsetting[i]; | |
20 | ||
cc4deafc | 21 | if (uas_is_interface(alt)) |
786de92b | 22 | return alt; |
82aa0387 HG |
23 | } |
24 | ||
786de92b | 25 | return NULL; |
82aa0387 | 26 | } |
79b4c061 | 27 | |
d77adc02 HG |
28 | static int uas_find_endpoints(struct usb_host_interface *alt, |
29 | struct usb_host_endpoint *eps[]) | |
30 | { | |
31 | struct usb_host_endpoint *endpoint = alt->endpoint; | |
32 | unsigned i, n_endpoints = alt->desc.bNumEndpoints; | |
33 | ||
34 | for (i = 0; i < n_endpoints; i++) { | |
35 | unsigned char *extra = endpoint[i].extra; | |
36 | int len = endpoint[i].extralen; | |
37 | while (len >= 3) { | |
38 | if (extra[1] == USB_DT_PIPE_USAGE) { | |
39 | unsigned pipe_id = extra[2]; | |
40 | if (pipe_id > 0 && pipe_id < 5) | |
41 | eps[pipe_id - 1] = &endpoint[i]; | |
42 | break; | |
43 | } | |
44 | len -= extra[0]; | |
45 | extra += extra[0]; | |
46 | } | |
47 | } | |
48 | ||
49 | if (!eps[0] || !eps[1] || !eps[2] || !eps[3]) | |
50 | return -ENODEV; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
79b4c061 | 55 | static int uas_use_uas_driver(struct usb_interface *intf, |
a5011d44 HG |
56 | const struct usb_device_id *id, |
57 | unsigned long *flags_ret) | |
79b4c061 | 58 | { |
6134041b | 59 | struct usb_host_endpoint *eps[4] = { }; |
97172a66 | 60 | struct usb_device *udev = interface_to_usbdev(intf); |
14aec589 | 61 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
79b4c061 | 62 | unsigned long flags = id->driver_info; |
786de92b AS |
63 | struct usb_host_interface *alt; |
64 | int r; | |
79b4c061 | 65 | |
6134041b | 66 | alt = uas_find_uas_alt_setting(intf); |
786de92b | 67 | if (!alt) |
6134041b HG |
68 | return 0; |
69 | ||
786de92b | 70 | r = uas_find_endpoints(alt, eps); |
6134041b HG |
71 | if (r < 0) |
72 | return 0; | |
73 | ||
a9c54caa | 74 | /* |
078fd7d6 HG |
75 | * ASMedia has a number of usb3 to sata bridge chips, at the time of |
76 | * this writing the following versions exist: | |
77 | * ASM1051 - no uas support version | |
78 | * ASM1051 - with broken (*) uas support | |
8e779c6c | 79 | * ASM1053 - with working uas support, but problems with large xfers |
078fd7d6 HG |
80 | * ASM1153 - with working uas support |
81 | * | |
82 | * Devices with these chips re-use a number of device-ids over the | |
83 | * entire line, so the device-id is useless to determine if we're | |
84 | * dealing with an ASM1051 (which we want to avoid). | |
85 | * | |
86 | * The ASM1153 can be identified by config.MaxPower == 0, | |
87 | * where as the ASM105x models have config.MaxPower == 36. | |
88 | * | |
89 | * Differentiating between the ASM1053 and ASM1051 is trickier, when | |
90 | * connected over USB-3 we can look at the number of streams supported, | |
91 | * ASM1051 supports 32 streams, where as early ASM1053 versions support | |
92 | * 16 streams, newer ASM1053-s also support 32 streams, but have a | |
93 | * different prod-id. | |
94 | * | |
95 | * (*) ASM1051 chips do work with UAS with some disks (with the | |
96 | * US_FL_NO_REPORT_OPCODES quirk), but are broken with other disks | |
a9c54caa | 97 | */ |
a79e5bc5 | 98 | if (le16_to_cpu(udev->descriptor.idVendor) == 0x174c && |
078fd7d6 HG |
99 | (le16_to_cpu(udev->descriptor.idProduct) == 0x5106 || |
100 | le16_to_cpu(udev->descriptor.idProduct) == 0x55aa)) { | |
101 | if (udev->actconfig->desc.bMaxPower == 0) { | |
102 | /* ASM1153, do nothing */ | |
103 | } else if (udev->speed < USB_SPEED_SUPER) { | |
a9c54caa HG |
104 | /* No streams info, assume ASM1051 */ |
105 | flags |= US_FL_IGNORE_UAS; | |
106 | } else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) { | |
078fd7d6 | 107 | /* Possibly an ASM1051, disable uas */ |
a9c54caa | 108 | flags |= US_FL_IGNORE_UAS; |
8e779c6c HG |
109 | } else { |
110 | /* ASM1053, these have issues with large transfers */ | |
111 | flags |= US_FL_MAX_SECTORS_240; | |
a9c54caa HG |
112 | } |
113 | } | |
114 | ||
115 | usb_stor_adjust_quirks(udev, &flags); | |
116 | ||
117 | if (flags & US_FL_IGNORE_UAS) { | |
118 | dev_warn(&udev->dev, | |
119 | "UAS is blacklisted for this device, using usb-storage instead\n"); | |
120 | return 0; | |
121 | } | |
122 | ||
cc4deafc HG |
123 | if (udev->bus->sg_tablesize == 0) { |
124 | dev_warn(&udev->dev, | |
125 | "The driver for the USB controller %s does not support scatter-gather which is\n", | |
126 | hcd->driver->description); | |
127 | dev_warn(&udev->dev, | |
128 | "required by the UAS driver. Please try an other USB controller if you wish to use UAS.\n"); | |
129 | return 0; | |
130 | } | |
131 | ||
43508be5 HG |
132 | if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams) { |
133 | dev_warn(&udev->dev, | |
134 | "USB controller %s does not support streams, which are required by the UAS driver.\n", | |
135 | hcd_to_bus(hcd)->bus_name); | |
136 | dev_warn(&udev->dev, | |
137 | "Please try an other USB controller if you wish to use UAS.\n"); | |
138 | return 0; | |
139 | } | |
140 | ||
a5011d44 HG |
141 | if (flags_ret) |
142 | *flags_ret = flags; | |
143 | ||
6134041b | 144 | return 1; |
79b4c061 | 145 | } |