From 27f18dc2dafe66a93c7101fc94201b8c83903597 Mon Sep 17 00:00:00 2001 From: Rafał Miłecki Date: Thu, 2 Jun 2011 02:08:51 +0200 Subject: bcma: read SPROM and extract MAC from it MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In case of BCMA cards SPROM is located in the ChipCommon core, it is not mapped as separated host window. So far we have met only SPROMs rev 8. SPROM layout seems to be the same as for SSB buses, so we decided to share SPROM struct and some defines. For now we extract MAC address only, this can be improved of course. Signed-off-by: Rafał Miłecki Signed-off-by: John W. Linville --- drivers/bcma/Makefile | 2 +- drivers/bcma/bcma_private.h | 3 + drivers/bcma/main.c | 7 ++ drivers/bcma/sprom.c | 162 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 173 insertions(+), 1 deletion(-) create mode 100644 drivers/bcma/sprom.c (limited to 'drivers') diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile index 0d56245bcb79..cde0182bd1dc 100644 --- a/drivers/bcma/Makefile +++ b/drivers/bcma/Makefile @@ -1,4 +1,4 @@ -bcma-y += main.o scan.o core.o +bcma-y += main.o scan.o core.o sprom.o bcma-y += driver_chipcommon.o driver_chipcommon_pmu.o bcma-y += driver_pci.o bcma-$(CONFIG_BCMA_HOST_PCI) += host_pci.o diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h index 2f72e9c585fd..12a75ab3dd23 100644 --- a/drivers/bcma/bcma_private.h +++ b/drivers/bcma/bcma_private.h @@ -19,6 +19,9 @@ extern void bcma_bus_unregister(struct bcma_bus *bus); /* scan.c */ int bcma_bus_scan(struct bcma_bus *bus); +/* sprom.c */ +int bcma_sprom_get(struct bcma_bus *bus); + #ifdef CONFIG_BCMA_HOST_PCI /* host_pci.c */ extern int __init bcma_host_pci_init(void); diff --git a/drivers/bcma/main.c b/drivers/bcma/main.c index a2f6b1879273..11e96dc6011a 100644 --- a/drivers/bcma/main.c +++ b/drivers/bcma/main.c @@ -146,6 +146,13 @@ int bcma_bus_register(struct bcma_bus *bus) bcma_core_pci_init(&bus->drv_pci); } + /* Try to get SPROM */ + err = bcma_sprom_get(bus); + if (err) { + pr_err("Failed to get SPROM: %d\n", err); + return -ENOENT; + } + /* Register found cores */ bcma_register_cores(bus); diff --git a/drivers/bcma/sprom.c b/drivers/bcma/sprom.c new file mode 100644 index 000000000000..ffbb0e32e921 --- /dev/null +++ b/drivers/bcma/sprom.c @@ -0,0 +1,162 @@ +/* + * Broadcom specific AMBA + * SPROM reading + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include "bcma_private.h" + +#include +#include +#include +#include +#include +#include + +#define SPOFF(offset) ((offset) / sizeof(u16)) + +/************************************************** + * R/W ops. + **************************************************/ + +static void bcma_sprom_read(struct bcma_bus *bus, u16 *sprom) +{ + int i; + for (i = 0; i < SSB_SPROMSIZE_WORDS_R4; i++) + sprom[i] = bcma_read16(bus->drv_cc.core, + BCMA_CC_SPROM + (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) { + 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 *sprom; + int err = 0; + + if (!bus->drv_cc.core) + return -EOPNOTSUPP; + + sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16), + GFP_KERNEL); + if (!sprom) + return -ENOMEM; + + bcma_sprom_read(bus, sprom); + + err = bcma_sprom_valid(sprom); + if (err) + goto out; + + bcma_sprom_extract_r8(bus, sprom); + +out: + kfree(sprom); + return err; +} -- cgit v1.2.3