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
isci_request_oprom(struct pci_dev * pdev)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 rom = NULL;
108 }
109 pci_unmap_biosrom(oprom);
110
111 return rom;
112 }
113
isci_parse_oem_parameters(struct sci_oem_params * oem,struct isci_orom * orom,int scu_index)114 enum sci_status isci_parse_oem_parameters(struct sci_oem_params *oem,
115 struct isci_orom *orom, int scu_index)
116 {
117 /* check for valid inputs */
118 if (scu_index < 0 || scu_index >= SCI_MAX_CONTROLLERS ||
119 scu_index > orom->hdr.num_elements || !oem)
120 return -EINVAL;
121
122 *oem = orom->ctrl[scu_index];
123 return 0;
124 }
125
isci_request_firmware(struct pci_dev * pdev,const struct firmware * fw)126 struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
127 {
128 struct isci_orom *orom = NULL, *data;
129 int i, j;
130
131 if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0)
132 return NULL;
133
134 if (fw->size < sizeof(*orom))
135 goto out;
136
137 data = (struct isci_orom *)fw->data;
138
139 if (strncmp(ISCI_ROM_SIG, data->hdr.signature,
140 strlen(ISCI_ROM_SIG)) != 0)
141 goto out;
142
143 orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL);
144 if (!orom)
145 goto out;
146
147 memcpy(orom, fw->data, fw->size);
148
149 if (is_c0(pdev) || is_c1(pdev))
150 goto out;
151
152 /*
153 * deprecated: override default amp_control for pre-preproduction
154 * silicon revisions
155 */
156 for (i = 0; i < ARRAY_SIZE(orom->ctrl); i++)
157 for (j = 0; j < ARRAY_SIZE(orom->ctrl[i].phys); j++) {
158 orom->ctrl[i].phys[j].afe_tx_amp_control0 = 0xe7c03;
159 orom->ctrl[i].phys[j].afe_tx_amp_control1 = 0xe7c03;
160 orom->ctrl[i].phys[j].afe_tx_amp_control2 = 0xe7c03;
161 orom->ctrl[i].phys[j].afe_tx_amp_control3 = 0xe7c03;
162 }
163 out:
164 release_firmware(fw);
165
166 return orom;
167 }
168
get_efi(void)169 static struct efi *get_efi(void)
170 {
171 #ifdef CONFIG_EFI
172 return &efi;
173 #else
174 return NULL;
175 #endif
176 }
177
isci_get_efi_var(struct pci_dev * pdev)178 struct isci_orom *isci_get_efi_var(struct pci_dev *pdev)
179 {
180 efi_status_t status;
181 struct isci_orom *rom;
182 struct isci_oem_hdr *oem_hdr;
183 u8 *tmp, sum;
184 int j;
185 unsigned long data_len;
186 u8 *efi_data;
187 u32 efi_attrib = 0;
188
189 data_len = 1024;
190 efi_data = devm_kzalloc(&pdev->dev, data_len, GFP_KERNEL);
191 if (!efi_data) {
192 dev_warn(&pdev->dev,
193 "Unable to allocate memory for EFI data\n");
194 return NULL;
195 }
196
197 rom = (struct isci_orom *)(efi_data + sizeof(struct isci_oem_hdr));
198
199 if (get_efi())
200 status = get_efi()->get_variable(isci_efivar_name,
201 &ISCI_EFI_VENDOR_GUID,
202 &efi_attrib,
203 &data_len,
204 efi_data);
205 else
206 status = EFI_NOT_FOUND;
207
208 if (status != EFI_SUCCESS) {
209 dev_warn(&pdev->dev,
210 "Unable to obtain EFI var data for OEM parms\n");
211 return NULL;
212 }
213
214 oem_hdr = (struct isci_oem_hdr *)efi_data;
215
216 if (memcmp(oem_hdr->sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) != 0) {
217 dev_warn(&pdev->dev,
218 "Invalid OEM header signature\n");
219 return NULL;
220 }
221
222 /* calculate checksum */
223 tmp = (u8 *)efi_data;
224 for (j = 0, sum = 0; j < (sizeof(*oem_hdr) + sizeof(*rom)); j++, tmp++)
225 sum += *tmp;
226
227 if (sum != 0) {
228 dev_warn(&pdev->dev,
229 "OEM table checksum failed\n");
230 return NULL;
231 }
232
233 if (memcmp(rom->hdr.signature,
234 ISCI_ROM_SIG,
235 ISCI_ROM_SIG_SIZE) != 0) {
236 dev_warn(&pdev->dev,
237 "Invalid OEM table signature\n");
238 return NULL;
239 }
240
241 return rom;
242 }
243