linux/drivers/bcma/sprom.c
Rafał Miłecki 984e5befba bcma: implement BCM4331 workaround for external PA lines
We need to disable ext. PA lines for reading SPROM. It's disabled by
default, but this patch allows using bcma after loading wl, which leaves
workaround enabled.

Cc: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-22 14:45:59 -04:00

178 lines
4.7 KiB
C

/*
* 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;
if (bus->chipinfo.id == 0x4331)
bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, false);
/* 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);
if (bus->chipinfo.id == 0x4331)
bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, true);
err = bcma_sprom_valid(sprom);
if (err)
goto out;
bcma_sprom_extract_r8(bus, sprom);
out:
kfree(sprom);
return err;
}