Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 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> |
Dave Jiang | 8db37aa | 2011-02-23 00:02:24 -0800 | [diff] [blame] | 30 | #include <linux/efi.h> |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 31 | #include <asm/probe_roms.h> |
| 32 | |
| 33 | #include "isci.h" |
| 34 | #include "task.h" |
| 35 | #include "sci_controller_constants.h" |
| 36 | #include "scic_remote_device.h" |
| 37 | #include "sci_environment.h" |
| 38 | #include "probe_roms.h" |
| 39 | |
Dave Jiang | 8db37aa | 2011-02-23 00:02:24 -0800 | [diff] [blame] | 40 | struct efi_variable { |
| 41 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; |
| 42 | efi_guid_t VendorGuid; |
| 43 | unsigned long DataSize; |
| 44 | __u8 Data[1024]; |
| 45 | efi_status_t Status; |
| 46 | __u32 Attributes; |
| 47 | } __attribute__((packed)); |
| 48 | |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 49 | struct isci_orom *isci_request_oprom(struct pci_dev *pdev) |
| 50 | { |
| 51 | void __iomem *oprom = pci_map_biosrom(pdev); |
| 52 | struct isci_orom *rom = NULL; |
| 53 | size_t len, i; |
Dan Williams | 3b67c1f | 2011-03-08 09:53:51 -0800 | [diff] [blame^] | 54 | int j; |
| 55 | char oem_sig[4]; |
| 56 | struct isci_oem_hdr oem_hdr; |
| 57 | u8 *tmp, sum; |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 58 | |
| 59 | if (!oprom) |
| 60 | return NULL; |
| 61 | |
| 62 | len = pci_biosrom_size(pdev); |
| 63 | rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL); |
| 64 | |
Dan Williams | 3b67c1f | 2011-03-08 09:53:51 -0800 | [diff] [blame^] | 65 | for (i = 0; i < len && rom; i += ISCI_OEM_SIG_SIZE) { |
| 66 | memcpy_fromio(oem_sig, oprom + i, ISCI_OEM_SIG_SIZE); |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 67 | |
Dan Williams | 3b67c1f | 2011-03-08 09:53:51 -0800 | [diff] [blame^] | 68 | /* we think we found the OEM table */ |
| 69 | if (memcmp(oem_sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) == 0) { |
| 70 | size_t copy_len; |
| 71 | |
| 72 | memcpy_fromio(&oem_hdr, oprom + i, sizeof(oem_hdr)); |
| 73 | |
| 74 | copy_len = min(oem_hdr.len - sizeof(oem_hdr), |
| 75 | sizeof(*rom)); |
| 76 | |
| 77 | memcpy_fromio(rom, |
| 78 | oprom + i + sizeof(oem_hdr), |
| 79 | copy_len); |
| 80 | |
| 81 | /* calculate checksum */ |
| 82 | tmp = (u8 *)&oem_hdr; |
| 83 | for (j = 0, sum = 0; j < sizeof(oem_hdr); j++, tmp++) |
| 84 | sum += *tmp; |
| 85 | |
| 86 | tmp = (u8 *)rom; |
| 87 | for (j = 0; j < sizeof(*rom); j++, tmp++) |
| 88 | sum += *tmp; |
| 89 | |
| 90 | if (sum != 0) { |
| 91 | dev_warn(&pdev->dev, |
| 92 | "OEM table checksum failed\n"); |
| 93 | continue; |
| 94 | } |
| 95 | |
| 96 | /* keep going if that's not the oem param table */ |
| 97 | if (memcmp(rom->hdr.signature, |
| 98 | ISCI_ROM_SIG, |
| 99 | ISCI_ROM_SIG_SIZE) != 0) |
| 100 | continue; |
| 101 | |
| 102 | dev_info(&pdev->dev, |
| 103 | "OEM parameter table found in OROM\n"); |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 104 | break; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | if (i >= len) { |
| 109 | dev_err(&pdev->dev, "oprom parse error\n"); |
| 110 | devm_kfree(&pdev->dev, rom); |
| 111 | rom = NULL; |
| 112 | } |
| 113 | pci_unmap_biosrom(oprom); |
| 114 | |
| 115 | return rom; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * isci_parse_oem_parameters() - This method will take OEM parameters |
| 120 | * from the module init parameters and copy them to oem_params. This will |
| 121 | * only copy values that are not set to the module parameter default values |
| 122 | * @oem_parameters: This parameter specifies the controller default OEM |
| 123 | * parameters. It is expected that this has been initialized to the default |
| 124 | * parameters for the controller |
| 125 | * |
| 126 | * |
| 127 | */ |
| 128 | enum sci_status isci_parse_oem_parameters(union scic_oem_parameters *oem_params, |
| 129 | struct isci_orom *orom, int scu_index) |
| 130 | { |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 131 | /* check for valid inputs */ |
Dave Jiang | 02839a8b5 | 2011-02-24 17:45:57 -0800 | [diff] [blame] | 132 | if (scu_index < 0 || scu_index > SCI_MAX_CONTROLLERS || |
| 133 | scu_index > orom->hdr.num_elements || !oem_params) |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 134 | return -EINVAL; |
| 135 | |
Dave Jiang | 02839a8b5 | 2011-02-24 17:45:57 -0800 | [diff] [blame] | 136 | memcpy(oem_params, |
| 137 | &orom->ctrl[scu_index], |
| 138 | sizeof(struct scic_sds_oem_params)); |
Dan Williams | d044af1 | 2011-03-08 09:52:49 -0800 | [diff] [blame] | 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw) |
| 144 | { |
| 145 | struct isci_orom *orom = NULL, *data; |
| 146 | |
| 147 | if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0) |
| 148 | return NULL; |
| 149 | |
| 150 | if (fw->size < sizeof(*orom)) |
| 151 | goto out; |
| 152 | |
| 153 | data = (struct isci_orom *)fw->data; |
| 154 | |
| 155 | if (strncmp(ISCI_ROM_SIG, data->hdr.signature, |
| 156 | strlen(ISCI_ROM_SIG)) != 0) |
| 157 | goto out; |
| 158 | |
| 159 | orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL); |
| 160 | if (!orom) |
| 161 | goto out; |
| 162 | |
| 163 | memcpy(orom, fw->data, fw->size); |
| 164 | |
| 165 | out: |
| 166 | release_firmware(fw); |
| 167 | |
| 168 | return orom; |
| 169 | } |
Dave Jiang | 8db37aa | 2011-02-23 00:02:24 -0800 | [diff] [blame] | 170 | |
| 171 | static struct efi *get_efi(void) |
| 172 | { |
| 173 | #ifdef CONFIG_EFI |
| 174 | return &efi; |
| 175 | #else |
| 176 | return NULL; |
| 177 | #endif |
| 178 | } |
| 179 | |
| 180 | struct isci_orom *isci_get_efi_var(struct pci_dev *pdev) |
| 181 | { |
| 182 | struct efi_variable *evar; |
| 183 | efi_status_t status; |
| 184 | struct isci_orom *orom = NULL; |
| 185 | |
| 186 | evar = devm_kzalloc(&pdev->dev, |
| 187 | sizeof(struct efi_variable), |
| 188 | GFP_KERNEL); |
| 189 | if (!evar) { |
| 190 | dev_warn(&pdev->dev, |
| 191 | "Unable to allocate memory for EFI var\n"); |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | evar->DataSize = 1024; |
| 196 | evar->VendorGuid = ISCI_EFI_VENDOR_GUID; |
| 197 | evar->Attributes = ISCI_EFI_ATTRIBUTES; |
| 198 | |
| 199 | if (get_efi()) |
| 200 | status = get_efi()->get_variable(evar->VariableName, |
| 201 | &evar->VendorGuid, |
| 202 | &evar->Attributes, |
| 203 | &evar->DataSize, |
| 204 | evar->Data); |
| 205 | else |
| 206 | status = EFI_NOT_FOUND; |
| 207 | |
| 208 | if (status == EFI_SUCCESS) |
| 209 | orom = (struct isci_orom *)evar->Data; |
| 210 | else |
| 211 | dev_warn(&pdev->dev, |
| 212 | "Unable to obtain EFI variable for OEM parms\n"); |
| 213 | |
| 214 | if (orom && memcmp(orom->hdr.signature, ISCI_ROM_SIG, |
| 215 | strlen(ISCI_ROM_SIG)) != 0) |
| 216 | dev_warn(&pdev->dev, |
| 217 | "Verifying OROM signature failed\n"); |
| 218 | |
| 219 | if (!orom) |
| 220 | devm_kfree(&pdev->dev, evar); |
| 221 | |
| 222 | return orom; |
| 223 | } |