diff options
Diffstat (limited to 'drivers/bcma/sprom.c')
| -rw-r--r-- | drivers/bcma/sprom.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/bcma/sprom.c b/drivers/bcma/sprom.c new file mode 100644 index 000000000000..8b5b7856abe3 --- /dev/null +++ b/drivers/bcma/sprom.c @@ -0,0 +1,171 @@ +/* + * Broadcom specific AMBA + * SPROM reading + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include "bcma_private.h" + +#include <linux/bcma/bcma.h> +#include <linux/bcma/bcma_regs.h> +#include <linux/pci.h> +#include <linux/io.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> + +#define SPOFF(offset) ((offset) / sizeof(u16)) + +/************************************************** + * R/W ops. + **************************************************/ + +static void bcma_sprom_read(struct bcma_bus *bus, u16 offset, u16 *sprom) +{ + int i; + for (i = 0; i < SSB_SPROMSIZE_WORDS_R4; i++) + sprom[i] = bcma_read16(bus->drv_cc.core, + offset + (i * 2)); +} + +/************************************************** + * Validation. + **************************************************/ + +static inline u8 bcma_crc8(u8 crc, u8 data) +{ + /* Polynomial: x^8 + x^7 + x^6 + x^4 + x^2 + 1 */ + static const u8 t[] = { + 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B, + 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21, + 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF, + 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5, + 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14, + 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E, + 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80, + 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA, + 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95, + 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF, + 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01, + 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B, + 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA, + 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0, + 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E, + 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34, + 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0, + 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A, + 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54, + 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E, + 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF, + 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5, + 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B, + 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61, + 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E, + 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74, + 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA, + 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0, + 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41, + 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B, + 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5, + 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F, + }; + return t[crc ^ data]; +} + +static u8 bcma_sprom_crc(const u16 *sprom) +{ + int word; + u8 crc = 0xFF; + + for (word = 0; word < SSB_SPROMSIZE_WORDS_R4 - 1; word++) { + crc = bcma_crc8(crc, sprom[word] & 0x00FF); + crc = bcma_crc8(crc, (sprom[word] & 0xFF00) >> 8); + } + crc = bcma_crc8(crc, sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & 0x00FF); + crc ^= 0xFF; + + return crc; +} + +static int bcma_sprom_check_crc(const u16 *sprom) +{ + u8 crc; + u8 expected_crc; + u16 tmp; + + crc = bcma_sprom_crc(sprom); + tmp = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_CRC; + expected_crc = tmp >> SSB_SPROM_REVISION_CRC_SHIFT; + if (crc != expected_crc) + return -EPROTO; + + return 0; +} + +static int bcma_sprom_valid(const u16 *sprom) +{ + u16 revision; + int err; + + err = bcma_sprom_check_crc(sprom); + if (err) + return err; + + revision = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_REV; + if (revision != 8 && revision != 9) { + pr_err("Unsupported SPROM revision: %d\n", revision); + return -ENOENT; + } + + return 0; +} + +/************************************************** + * SPROM extraction. + **************************************************/ + +static void bcma_sprom_extract_r8(struct bcma_bus *bus, const u16 *sprom) +{ + u16 v; + int i; + + for (i = 0; i < 3; i++) { + v = sprom[SPOFF(SSB_SPROM8_IL0MAC) + i]; + *(((__be16 *)bus->sprom.il0mac) + i) = cpu_to_be16(v); + } +} + +int bcma_sprom_get(struct bcma_bus *bus) +{ + u16 offset; + u16 *sprom; + int err = 0; + + if (!bus->drv_cc.core) + return -EOPNOTSUPP; + + if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM)) + return -ENOENT; + + sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16), + GFP_KERNEL); + if (!sprom) + return -ENOMEM; + + /* Most cards have SPROM moved by additional offset 0x30 (48 dwords). + * According to brcm80211 this applies to cards with PCIe rev >= 6 + * TODO: understand this condition and use it */ + offset = (bus->chipinfo.id == 0x4331) ? BCMA_CC_SPROM : + BCMA_CC_SPROM_PCIE6; + bcma_sprom_read(bus, offset, sprom); + + err = bcma_sprom_valid(sprom); + if (err) + goto out; + + bcma_sprom_extract_r8(bus, sprom); + +out: + kfree(sprom); + return err; +} |