diff options
Diffstat (limited to 'drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c')
| -rw-r--r-- | drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c b/drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c index 7f01a9b4aa2f..7bf9778cfeff 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/sdio_chip.c @@ -106,11 +106,63 @@ static int brcmf_sdio_chip_recognition(struct brcmf_sdio_dev *sdiodev, return 0; } +static int +brcmf_sdio_chip_buscoreprep(struct brcmf_sdio_dev *sdiodev) +{ + int err = 0; + u8 clkval, clkset; + + /* Try forcing SDIO core to do ALPAvail request only */ + clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_ALP_AVAIL_REQ; + brcmf_sdcard_cfg_write(sdiodev, SDIO_FUNC_1, + SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err); + if (err) { + brcmf_dbg(ERROR, "error writing for HT off\n"); + return err; + } + + /* If register supported, wait for ALPAvail and then force ALP */ + /* This may take up to 15 milliseconds */ + clkval = brcmf_sdcard_cfg_read(sdiodev, SDIO_FUNC_1, + SBSDIO_FUNC1_CHIPCLKCSR, NULL); + + if ((clkval & ~SBSDIO_AVBITS) != clkset) { + brcmf_dbg(ERROR, "ChipClkCSR access: wrote 0x%02x read 0x%02x\n", + clkset, clkval); + return -EACCES; + } + + SPINWAIT(((clkval = brcmf_sdcard_cfg_read(sdiodev, SDIO_FUNC_1, + SBSDIO_FUNC1_CHIPCLKCSR, NULL)), + !SBSDIO_ALPAV(clkval)), + PMU_MAX_TRANSITION_DLY); + if (!SBSDIO_ALPAV(clkval)) { + brcmf_dbg(ERROR, "timeout on ALPAV wait, clkval 0x%02x\n", + clkval); + return -EBUSY; + } + + clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_FORCE_ALP; + brcmf_sdcard_cfg_write(sdiodev, SDIO_FUNC_1, + SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err); + udelay(65); + + /* Also, disable the extra SDIO pull-ups */ + brcmf_sdcard_cfg_write(sdiodev, SDIO_FUNC_1, + SBSDIO_FUNC1_SDIOPULLUP, 0, NULL); + + return 0; +} + int brcmf_sdio_chip_attach(struct brcmf_sdio_dev *sdiodev, struct chip_info *ci, u32 regs) { int ret = 0; + ret = brcmf_sdio_chip_buscoreprep(sdiodev); + if (ret != 0) + return ret; + ret = brcmf_sdio_chip_recognition(sdiodev, ci, regs); if (ret != 0) return ret; |