linux/drivers/bcma/sprom.c
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   1/*
   2 * Broadcom specific AMBA
   3 * SPROM reading
   4 *
   5 * Licensed under the GNU/GPL. See COPYING for details.
   6 */
   7
   8#include "bcma_private.h"
   9
  10#include <linux/bcma/bcma.h>
  11#include <linux/bcma/bcma_regs.h>
  12#include <linux/pci.h>
  13#include <linux/io.h>
  14#include <linux/dma-mapping.h>
  15#include <linux/slab.h>
  16
  17#define SPOFF(offset)   ((offset) / sizeof(u16))
  18
  19/**************************************************
  20 * R/W ops.
  21 **************************************************/
  22
  23static void bcma_sprom_read(struct bcma_bus *bus, u16 offset, u16 *sprom)
  24{
  25        int i;
  26        for (i = 0; i < SSB_SPROMSIZE_WORDS_R4; i++)
  27                sprom[i] = bcma_read16(bus->drv_cc.core,
  28                                       offset + (i * 2));
  29}
  30
  31/**************************************************
  32 * Validation.
  33 **************************************************/
  34
  35static inline u8 bcma_crc8(u8 crc, u8 data)
  36{
  37        /* Polynomial:   x^8 + x^7 + x^6 + x^4 + x^2 + 1   */
  38        static const u8 t[] = {
  39                0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B,
  40                0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21,
  41                0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF,
  42                0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5,
  43                0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14,
  44                0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E,
  45                0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80,
  46                0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA,
  47                0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95,
  48                0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF,
  49                0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01,
  50                0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B,
  51                0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA,
  52                0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0,
  53                0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E,
  54                0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34,
  55                0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0,
  56                0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A,
  57                0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54,
  58                0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E,
  59                0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF,
  60                0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5,
  61                0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B,
  62                0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61,
  63                0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E,
  64                0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74,
  65                0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA,
  66                0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0,
  67                0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41,
  68                0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B,
  69                0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5,
  70                0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F,
  71        };
  72        return t[crc ^ data];
  73}
  74
  75static u8 bcma_sprom_crc(const u16 *sprom)
  76{
  77        int word;
  78        u8 crc = 0xFF;
  79
  80        for (word = 0; word < SSB_SPROMSIZE_WORDS_R4 - 1; word++) {
  81                crc = bcma_crc8(crc, sprom[word] & 0x00FF);
  82                crc = bcma_crc8(crc, (sprom[word] & 0xFF00) >> 8);
  83        }
  84        crc = bcma_crc8(crc, sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & 0x00FF);
  85        crc ^= 0xFF;
  86
  87        return crc;
  88}
  89
  90static int bcma_sprom_check_crc(const u16 *sprom)
  91{
  92        u8 crc;
  93        u8 expected_crc;
  94        u16 tmp;
  95
  96        crc = bcma_sprom_crc(sprom);
  97        tmp = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_CRC;
  98        expected_crc = tmp >> SSB_SPROM_REVISION_CRC_SHIFT;
  99        if (crc != expected_crc)
 100                return -EPROTO;
 101
 102        return 0;
 103}
 104
 105static int bcma_sprom_valid(const u16 *sprom)
 106{
 107        u16 revision;
 108        int err;
 109
 110        err = bcma_sprom_check_crc(sprom);
 111        if (err)
 112                return err;
 113
 114        revision = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] & SSB_SPROM_REVISION_REV;
 115        if (revision != 8 && revision != 9) {
 116                pr_err("Unsupported SPROM revision: %d\n", revision);
 117                return -ENOENT;
 118        }
 119
 120        return 0;
 121}
 122
 123/**************************************************
 124 * SPROM extraction.
 125 **************************************************/
 126
 127static void bcma_sprom_extract_r8(struct bcma_bus *bus, const u16 *sprom)
 128{
 129        u16 v;
 130        int i;
 131
 132        bus->sprom.revision = sprom[SSB_SPROMSIZE_WORDS_R4 - 1] &
 133                SSB_SPROM_REVISION_REV;
 134
 135        for (i = 0; i < 3; i++) {
 136                v = sprom[SPOFF(SSB_SPROM8_IL0MAC) + i];
 137                *(((__be16 *)bus->sprom.il0mac) + i) = cpu_to_be16(v);
 138        }
 139
 140        bus->sprom.board_rev = sprom[SPOFF(SSB_SPROM8_BOARDREV)];
 141
 142        bus->sprom.txpid2g[0] = (sprom[SPOFF(SSB_SPROM4_TXPID2G01)] &
 143             SSB_SPROM4_TXPID2G0) >> SSB_SPROM4_TXPID2G0_SHIFT;
 144        bus->sprom.txpid2g[1] = (sprom[SPOFF(SSB_SPROM4_TXPID2G01)] &
 145             SSB_SPROM4_TXPID2G1) >> SSB_SPROM4_TXPID2G1_SHIFT;
 146        bus->sprom.txpid2g[2] = (sprom[SPOFF(SSB_SPROM4_TXPID2G23)] &
 147             SSB_SPROM4_TXPID2G2) >> SSB_SPROM4_TXPID2G2_SHIFT;
 148        bus->sprom.txpid2g[3] = (sprom[SPOFF(SSB_SPROM4_TXPID2G23)] &
 149             SSB_SPROM4_TXPID2G3) >> SSB_SPROM4_TXPID2G3_SHIFT;
 150
 151        bus->sprom.txpid5gl[0] = (sprom[SPOFF(SSB_SPROM4_TXPID5GL01)] &
 152             SSB_SPROM4_TXPID5GL0) >> SSB_SPROM4_TXPID5GL0_SHIFT;
 153        bus->sprom.txpid5gl[1] = (sprom[SPOFF(SSB_SPROM4_TXPID5GL01)] &
 154             SSB_SPROM4_TXPID5GL1) >> SSB_SPROM4_TXPID5GL1_SHIFT;
 155        bus->sprom.txpid5gl[2] = (sprom[SPOFF(SSB_SPROM4_TXPID5GL23)] &
 156             SSB_SPROM4_TXPID5GL2) >> SSB_SPROM4_TXPID5GL2_SHIFT;
 157        bus->sprom.txpid5gl[3] = (sprom[SPOFF(SSB_SPROM4_TXPID5GL23)] &
 158             SSB_SPROM4_TXPID5GL3) >> SSB_SPROM4_TXPID5GL3_SHIFT;
 159
 160        bus->sprom.txpid5g[0] = (sprom[SPOFF(SSB_SPROM4_TXPID5G01)] &
 161             SSB_SPROM4_TXPID5G0) >> SSB_SPROM4_TXPID5G0_SHIFT;
 162        bus->sprom.txpid5g[1] = (sprom[SPOFF(SSB_SPROM4_TXPID5G01)] &
 163             SSB_SPROM4_TXPID5G1) >> SSB_SPROM4_TXPID5G1_SHIFT;
 164        bus->sprom.txpid5g[2] = (sprom[SPOFF(SSB_SPROM4_TXPID5G23)] &
 165             SSB_SPROM4_TXPID5G2) >> SSB_SPROM4_TXPID5G2_SHIFT;
 166        bus->sprom.txpid5g[3] = (sprom[SPOFF(SSB_SPROM4_TXPID5G23)] &
 167             SSB_SPROM4_TXPID5G3) >> SSB_SPROM4_TXPID5G3_SHIFT;
 168
 169        bus->sprom.txpid5gh[0] = (sprom[SPOFF(SSB_SPROM4_TXPID5GH01)] &
 170             SSB_SPROM4_TXPID5GH0) >> SSB_SPROM4_TXPID5GH0_SHIFT;
 171        bus->sprom.txpid5gh[1] = (sprom[SPOFF(SSB_SPROM4_TXPID5GH01)] &
 172             SSB_SPROM4_TXPID5GH1) >> SSB_SPROM4_TXPID5GH1_SHIFT;
 173        bus->sprom.txpid5gh[2] = (sprom[SPOFF(SSB_SPROM4_TXPID5GH23)] &
 174             SSB_SPROM4_TXPID5GH2) >> SSB_SPROM4_TXPID5GH2_SHIFT;
 175        bus->sprom.txpid5gh[3] = (sprom[SPOFF(SSB_SPROM4_TXPID5GH23)] &
 176             SSB_SPROM4_TXPID5GH3) >> SSB_SPROM4_TXPID5GH3_SHIFT;
 177
 178        bus->sprom.boardflags_lo = sprom[SPOFF(SSB_SPROM8_BFLLO)];
 179        bus->sprom.boardflags_hi = sprom[SPOFF(SSB_SPROM8_BFLHI)];
 180        bus->sprom.boardflags2_lo = sprom[SPOFF(SSB_SPROM8_BFL2LO)];
 181        bus->sprom.boardflags2_hi = sprom[SPOFF(SSB_SPROM8_BFL2HI)];
 182
 183        bus->sprom.country_code = sprom[SPOFF(SSB_SPROM8_CCODE)];
 184
 185        bus->sprom.fem.ghz2.tssipos = (sprom[SPOFF(SSB_SPROM8_FEM2G)] &
 186                SSB_SROM8_FEM_TSSIPOS) >> SSB_SROM8_FEM_TSSIPOS_SHIFT;
 187        bus->sprom.fem.ghz2.extpa_gain = (sprom[SPOFF(SSB_SPROM8_FEM2G)] &
 188                SSB_SROM8_FEM_EXTPA_GAIN) >> SSB_SROM8_FEM_EXTPA_GAIN_SHIFT;
 189        bus->sprom.fem.ghz2.pdet_range = (sprom[SPOFF(SSB_SPROM8_FEM2G)] &
 190                SSB_SROM8_FEM_PDET_RANGE) >> SSB_SROM8_FEM_PDET_RANGE_SHIFT;
 191        bus->sprom.fem.ghz2.tr_iso = (sprom[SPOFF(SSB_SPROM8_FEM2G)] &
 192                SSB_SROM8_FEM_TR_ISO) >> SSB_SROM8_FEM_TR_ISO_SHIFT;
 193        bus->sprom.fem.ghz2.antswlut = (sprom[SPOFF(SSB_SPROM8_FEM2G)] &
 194                SSB_SROM8_FEM_ANTSWLUT) >> SSB_SROM8_FEM_ANTSWLUT_SHIFT;
 195
 196        bus->sprom.fem.ghz5.tssipos = (sprom[SPOFF(SSB_SPROM8_FEM5G)] &
 197                SSB_SROM8_FEM_TSSIPOS) >> SSB_SROM8_FEM_TSSIPOS_SHIFT;
 198        bus->sprom.fem.ghz5.extpa_gain = (sprom[SPOFF(SSB_SPROM8_FEM5G)] &
 199                SSB_SROM8_FEM_EXTPA_GAIN) >> SSB_SROM8_FEM_EXTPA_GAIN_SHIFT;
 200        bus->sprom.fem.ghz5.pdet_range = (sprom[SPOFF(SSB_SPROM8_FEM5G)] &
 201                SSB_SROM8_FEM_PDET_RANGE) >> SSB_SROM8_FEM_PDET_RANGE_SHIFT;
 202        bus->sprom.fem.ghz5.tr_iso = (sprom[SPOFF(SSB_SPROM8_FEM5G)] &
 203                SSB_SROM8_FEM_TR_ISO) >> SSB_SROM8_FEM_TR_ISO_SHIFT;
 204        bus->sprom.fem.ghz5.antswlut = (sprom[SPOFF(SSB_SPROM8_FEM5G)] &
 205                SSB_SROM8_FEM_ANTSWLUT) >> SSB_SROM8_FEM_ANTSWLUT_SHIFT;
 206}
 207
 208int bcma_sprom_get(struct bcma_bus *bus)
 209{
 210        u16 offset;
 211        u16 *sprom;
 212        int err = 0;
 213
 214        if (!bus->drv_cc.core)
 215                return -EOPNOTSUPP;
 216
 217        if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
 218                return -ENOENT;
 219
 220        sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
 221                        GFP_KERNEL);
 222        if (!sprom)
 223                return -ENOMEM;
 224
 225        if (bus->chipinfo.id == 0x4331)
 226                bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, false);
 227
 228        /* Most cards have SPROM moved by additional offset 0x30 (48 dwords).
 229         * According to brcm80211 this applies to cards with PCIe rev >= 6
 230         * TODO: understand this condition and use it */
 231        offset = (bus->chipinfo.id == 0x4331) ? BCMA_CC_SPROM :
 232                BCMA_CC_SPROM_PCIE6;
 233        bcma_sprom_read(bus, offset, sprom);
 234
 235        if (bus->chipinfo.id == 0x4331)
 236                bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, true);
 237
 238        err = bcma_sprom_valid(sprom);
 239        if (err)
 240                goto out;
 241
 242        bcma_sprom_extract_r8(bus, sprom);
 243
 244out:
 245        kfree(sprom);
 246        return err;
 247}
 248