summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/isci/probe_roms.c
blob: 4d95654c3fd4852ebeaff740e11bbe2492d4c4a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 */

/* probe_roms - scan for oem parameters */

#include <linux/kernel.h>
#include <linux/firmware.h>
#include <linux/uaccess.h>
#include <linux/efi.h>
#include <asm/probe_roms.h>

#include "isci.h"
#include "task.h"
#include "probe_roms.h"

static efi_char16_t isci_efivar_name[] = {
	'R', 's', 't', 'S', 'c', 'u', 'O'
};

struct isci_orom *isci_request_oprom(struct pci_dev *pdev)
{
	void __iomem *oprom = pci_map_biosrom(pdev);
	struct isci_orom *rom = NULL;
	size_t len, i;
	int j;
	char oem_sig[4];
	struct isci_oem_hdr oem_hdr;
	u8 *tmp, sum;

	if (!oprom)
		return NULL;

	len = pci_biosrom_size(pdev);
	rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
	if (!rom) {
		dev_warn(&pdev->dev,
			 "Unable to allocate memory for orom\n");
		return NULL;
	}

	for (i = 0; i < len && rom; i += ISCI_OEM_SIG_SIZE) {
		memcpy_fromio(oem_sig, oprom + i, ISCI_OEM_SIG_SIZE);

		/* we think we found the OEM table */
		if (memcmp(oem_sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) == 0) {
			size_t copy_len;

			memcpy_fromio(&oem_hdr, oprom + i, sizeof(oem_hdr));

			copy_len = min(oem_hdr.len - sizeof(oem_hdr),
				       sizeof(*rom));

			memcpy_fromio(rom,
				      oprom + i + sizeof(oem_hdr),
				      copy_len);

			/* calculate checksum */
			tmp = (u8 *)&oem_hdr;
			for (j = 0, sum = 0; j < sizeof(oem_hdr); j++, tmp++)
				sum += *tmp;

			tmp = (u8 *)rom;
			for (j = 0; j < sizeof(*rom); j++, tmp++)
				sum += *tmp;

			if (sum != 0) {
				dev_warn(&pdev->dev,
					 "OEM table checksum failed\n");
				continue;
			}

			/* keep going if that's not the oem param table */
			if (memcmp(rom->hdr.signature,
				   ISCI_ROM_SIG,
				   ISCI_ROM_SIG_SIZE) != 0)
				continue;

			dev_info(&pdev->dev,
				 "OEM parameter table found in OROM\n");
			break;
		}
	}

	if (i >= len) {
		dev_err(&pdev->dev, "oprom parse error\n");
		devm_kfree(&pdev->dev, rom);
		rom = NULL;
	}
	pci_unmap_biosrom(oprom);

	return rom;
}

struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
{
	struct isci_orom *orom = NULL, *data;
	int i, j;

	if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0)
		return NULL;

	if (fw->size < sizeof(*orom))
		goto out;

	data = (struct isci_orom *)fw->data;

	if (strncmp(ISCI_ROM_SIG, data->hdr.signature,
		    strlen(ISCI_ROM_SIG)) != 0)
		goto out;

	orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL);
	if (!orom)
		goto out;

	memcpy(orom, fw->data, fw->size);

	if (is_c0(pdev) || is_c1(pdev))
		goto out;

	/*
	 * deprecated: override default amp_control for pre-preproduction
	 * silicon revisions
	 */
	for (i = 0; i < ARRAY_SIZE(orom->ctrl); i++)
		for (j = 0; j < ARRAY_SIZE(orom->ctrl[i].phys); j++) {
			orom->ctrl[i].phys[j].afe_tx_amp_control0 = 0xe7c03;
			orom->ctrl[i].phys[j].afe_tx_amp_control1 = 0xe7c03;
			orom->ctrl[i].phys[j].afe_tx_amp_control2 = 0xe7c03;
			orom->ctrl[i].phys[j].afe_tx_amp_control3 = 0xe7c03;
		}
 out:
	release_firmware(fw);

	return orom;
}

static struct efi *get_efi(void)
{
#ifdef CONFIG_EFI
	return &efi;
#else
	return NULL;
#endif
}

struct isci_orom *isci_get_efi_var(struct pci_dev *pdev)
{
	efi_status_t status;
	struct isci_orom *rom;
	struct isci_oem_hdr *oem_hdr;
	u8 *tmp, sum;
	int j;
	unsigned long data_len;
	u8 *efi_data;
	u32 efi_attrib = 0;

	data_len = 1024;
	efi_data = devm_kzalloc(&pdev->dev, data_len, GFP_KERNEL);
	if (!efi_data) {
		dev_warn(&pdev->dev,
			 "Unable to allocate memory for EFI data\n");
		return NULL;
	}

	rom = (struct isci_orom *)(efi_data + sizeof(struct isci_oem_hdr));

	if (get_efi())
		status = get_efi()->get_variable(isci_efivar_name,
						 &ISCI_EFI_VENDOR_GUID,
						 &efi_attrib,
						 &data_len,
						 efi_data);
	else
		status = EFI_NOT_FOUND;

	if (status != EFI_SUCCESS) {
		dev_warn(&pdev->dev,
			 "Unable to obtain EFI var data for OEM parms\n");
		return NULL;
	}

	oem_hdr = (struct isci_oem_hdr *)efi_data;

	if (memcmp(oem_hdr->sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) != 0) {
		dev_warn(&pdev->dev,
			 "Invalid OEM header signature\n");
		return NULL;
	}

	/* calculate checksum */
	tmp = (u8 *)efi_data;
	for (j = 0, sum = 0; j < (sizeof(*oem_hdr) + sizeof(*rom)); j++, tmp++)
		sum += *tmp;

	if (sum != 0) {
		dev_warn(&pdev->dev,
			 "OEM table checksum failed\n");
		return NULL;
	}

	if (memcmp(rom->hdr.signature,
		   ISCI_ROM_SIG,
		   ISCI_ROM_SIG_SIZE) != 0) {
		dev_warn(&pdev->dev,
			 "Invalid OEM table signature\n");
		return NULL;
	}

	return rom;
}