Merge branch 'stable/bug.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / drivers / scsi / isci / probe_roms.c
1 /*
2  * This file is provided under a dual BSD/GPLv2 license.  When using or
3  * redistributing this file, you may do so under either license.
4  *
5  * GPL LICENSE SUMMARY
6  *
7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21  * The full GNU General Public License is included in this distribution
22  * in the file called LICENSE.GPL.
23  */
24
25 /* probe_roms - scan for oem parameters */
26
27 #include <linux/kernel.h>
28 #include <linux/firmware.h>
29 #include <linux/uaccess.h>
30 #include <linux/efi.h>
31 #include <asm/probe_roms.h>
32
33 #include "isci.h"
34 #include "task.h"
35 #include "probe_roms.h"
36
37 static efi_char16_t isci_efivar_name[] = {
38         'R', 's', 't', 'S', 'c', 'u', 'O'
39 };
40
41 struct isci_orom *isci_request_oprom(struct pci_dev *pdev)
42 {
43         void __iomem *oprom = pci_map_biosrom(pdev);
44         struct isci_orom *rom = NULL;
45         size_t len, i;
46         int j;
47         char oem_sig[4];
48         struct isci_oem_hdr oem_hdr;
49         u8 *tmp, sum;
50
51         if (!oprom)
52                 return NULL;
53
54         len = pci_biosrom_size(pdev);
55         rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
56         if (!rom) {
57                 dev_warn(&pdev->dev,
58                          "Unable to allocate memory for orom\n");
59                 return NULL;
60         }
61
62         for (i = 0; i < len && rom; i += ISCI_OEM_SIG_SIZE) {
63                 memcpy_fromio(oem_sig, oprom + i, ISCI_OEM_SIG_SIZE);
64
65                 /* we think we found the OEM table */
66                 if (memcmp(oem_sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) == 0) {
67                         size_t copy_len;
68
69                         memcpy_fromio(&oem_hdr, oprom + i, sizeof(oem_hdr));
70
71                         copy_len = min(oem_hdr.len - sizeof(oem_hdr),
72                                        sizeof(*rom));
73
74                         memcpy_fromio(rom,
75                                       oprom + i + sizeof(oem_hdr),
76                                       copy_len);
77
78                         /* calculate checksum */
79                         tmp = (u8 *)&oem_hdr;
80                         for (j = 0, sum = 0; j < sizeof(oem_hdr); j++, tmp++)
81                                 sum += *tmp;
82
83                         tmp = (u8 *)rom;
84                         for (j = 0; j < sizeof(*rom); j++, tmp++)
85                                 sum += *tmp;
86
87                         if (sum != 0) {
88                                 dev_warn(&pdev->dev,
89                                          "OEM table checksum failed\n");
90                                 continue;
91                         }
92
93                         /* keep going if that's not the oem param table */
94                         if (memcmp(rom->hdr.signature,
95                                    ISCI_ROM_SIG,
96                                    ISCI_ROM_SIG_SIZE) != 0)
97                                 continue;
98
99                         dev_info(&pdev->dev,
100                                  "OEM parameter table found in OROM\n");
101                         break;
102                 }
103         }
104
105         if (i >= len) {
106                 dev_err(&pdev->dev, "oprom parse error\n");
107                 devm_kfree(&pdev->dev, rom);
108                 rom = NULL;
109         }
110         pci_unmap_biosrom(oprom);
111
112         return rom;
113 }
114
115 enum sci_status isci_parse_oem_parameters(struct sci_oem_params *oem,
116                                           struct isci_orom *orom, int scu_index)
117 {
118         /* check for valid inputs */
119         if (scu_index < 0 || scu_index >= SCI_MAX_CONTROLLERS ||
120             scu_index > orom->hdr.num_elements || !oem)
121                 return -EINVAL;
122
123         *oem = orom->ctrl[scu_index];
124         return 0;
125 }
126
127 struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
128 {
129         struct isci_orom *orom = NULL, *data;
130         int i, j;
131
132         if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0)
133                 return NULL;
134
135         if (fw->size < sizeof(*orom))
136                 goto out;
137
138         data = (struct isci_orom *)fw->data;
139
140         if (strncmp(ISCI_ROM_SIG, data->hdr.signature,
141                     strlen(ISCI_ROM_SIG)) != 0)
142                 goto out;
143
144         orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL);
145         if (!orom)
146                 goto out;
147
148         memcpy(orom, fw->data, fw->size);
149
150         if (is_c0(pdev))
151                 goto out;
152
153         /*
154          * deprecated: override default amp_control for pre-preproduction
155          * silicon revisions
156          */
157         for (i = 0; i < ARRAY_SIZE(orom->ctrl); i++)
158                 for (j = 0; j < ARRAY_SIZE(orom->ctrl[i].phys); j++) {
159                         orom->ctrl[i].phys[j].afe_tx_amp_control0 = 0xe7c03;
160                         orom->ctrl[i].phys[j].afe_tx_amp_control1 = 0xe7c03;
161                         orom->ctrl[i].phys[j].afe_tx_amp_control2 = 0xe7c03;
162                         orom->ctrl[i].phys[j].afe_tx_amp_control3 = 0xe7c03;
163                 }
164  out:
165         release_firmware(fw);
166
167         return orom;
168 }
169
170 static struct efi *get_efi(void)
171 {
172 #ifdef CONFIG_EFI
173         return &efi;
174 #else
175         return NULL;
176 #endif
177 }
178
179 struct isci_orom *isci_get_efi_var(struct pci_dev *pdev)
180 {
181         efi_status_t status;
182         struct isci_orom *rom;
183         struct isci_oem_hdr *oem_hdr;
184         u8 *tmp, sum;
185         int j;
186         unsigned long data_len;
187         u8 *efi_data;
188         u32 efi_attrib = 0;
189
190         data_len = 1024;
191         efi_data = devm_kzalloc(&pdev->dev, data_len, GFP_KERNEL);
192         if (!efi_data) {
193                 dev_warn(&pdev->dev,
194                          "Unable to allocate memory for EFI data\n");
195                 return NULL;
196         }
197
198         rom = (struct isci_orom *)(efi_data + sizeof(struct isci_oem_hdr));
199
200         if (get_efi())
201                 status = get_efi()->get_variable(isci_efivar_name,
202                                                  &ISCI_EFI_VENDOR_GUID,
203                                                  &efi_attrib,
204                                                  &data_len,
205                                                  efi_data);
206         else
207                 status = EFI_NOT_FOUND;
208
209         if (status != EFI_SUCCESS) {
210                 dev_warn(&pdev->dev,
211                          "Unable to obtain EFI var data for OEM parms\n");
212                 return NULL;
213         }
214
215         oem_hdr = (struct isci_oem_hdr *)efi_data;
216
217         if (memcmp(oem_hdr->sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) != 0) {
218                 dev_warn(&pdev->dev,
219                          "Invalid OEM header signature\n");
220                 return NULL;
221         }
222
223         /* calculate checksum */
224         tmp = (u8 *)efi_data;
225         for (j = 0, sum = 0; j < (sizeof(*oem_hdr) + sizeof(*rom)); j++, tmp++)
226                 sum += *tmp;
227
228         if (sum != 0) {
229                 dev_warn(&pdev->dev,
230                          "OEM table checksum failed\n");
231                 return NULL;
232         }
233
234         if (memcmp(rom->hdr.signature,
235                    ISCI_ROM_SIG,
236                    ISCI_ROM_SIG_SIZE) != 0) {
237                 dev_warn(&pdev->dev,
238                          "Invalid OEM table signature\n");
239                 return NULL;
240         }
241
242         return rom;
243 }