diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2018-03-19 21:40:33 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2018-03-19 21:40:33 +0000 |
| commit | bd46ffe0b1436669d82cab30d7f84932ab86c278 (patch) | |
| tree | 45e33d701f3d20afe7eac30ff29643b632099eb3 /sys/dev/sdmmc | |
| parent | c86c7aeedf859cc7bc11bc44d43d4f0680a19603 (diff) | |
Make it possible for the sdhc(4) attachment glue to specify the base clock
frequency.
ok patrick@, visa@
Diffstat (limited to 'sys/dev/sdmmc')
| -rw-r--r-- | sys/dev/sdmmc/sdhc.c | 11 | ||||
| -rw-r--r-- | sys/dev/sdmmc/sdhcreg.h | 4 | ||||
| -rw-r--r-- | sys/dev/sdmmc/sdhcvar.h | 3 |
3 files changed, 13 insertions, 5 deletions
diff --git a/sys/dev/sdmmc/sdhc.c b/sys/dev/sdmmc/sdhc.c index cf5e355c70d..e7881a1a607 100644 --- a/sys/dev/sdmmc/sdhc.c +++ b/sys/dev/sdmmc/sdhc.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sdhc.c,v 1.56 2018/02/10 05:21:13 jmatthew Exp $ */ +/* $OpenBSD: sdhc.c,v 1.57 2018/03/19 21:40:32 kettenis Exp $ */ /* * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org> @@ -203,6 +203,11 @@ sdhc_host_found(struct sdhc_softc *sc, bus_space_tag_t iot, hp->clkbase = SDHC_BASE_FREQ_KHZ(caps); } if (hp->clkbase == 0) { + /* Make sure we can clock down to 400 kHz. */ + max_clock = 400 * SDHC_SDCLK_DIV_MAX_V3; + hp->clkbase = sc->sc_clkbase; + } + if (hp->clkbase == 0) { /* The attachment driver must tell us. */ printf("%s: base clock frequency unknown\n", sc->sc_dev.dv_xname); @@ -536,11 +541,11 @@ sdhc_bus_power(sdmmc_chipset_handle_t sch, u_int32_t ocr) static int sdhc_clock_divisor(struct sdhc_host *hp, u_int freq) { - int max_div = 256; + int max_div = SDHC_SDCLK_DIV_MAX;; int div; if (SDHC_SPEC_VERSION(hp->version) >= SDHC_SPEC_V3) - max_div = 2046; + max_div = SDHC_SDCLK_DIV_MAX_V3;; for (div = 1; div <= max_div; div *= 2) if ((hp->clkbase / div) <= freq) diff --git a/sys/dev/sdmmc/sdhcreg.h b/sys/dev/sdmmc/sdhcreg.h index 8b221e879fa..97b3e748bff 100644 --- a/sys/dev/sdmmc/sdhcreg.h +++ b/sys/dev/sdmmc/sdhcreg.h @@ -1,4 +1,4 @@ -/* $OpenBSD: sdhcreg.h,v 1.7 2016/04/30 11:49:29 kettenis Exp $ */ +/* $OpenBSD: sdhcreg.h,v 1.8 2018/03/19 21:40:32 kettenis Exp $ */ /* * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org> @@ -211,6 +211,8 @@ #define SDHC_SDCLK_DIV_V3(div) \ (SDHC_SDCLK_DIV(div) | \ (((div) & SDHC_SDCLK_DIV_MASK_V3) >> SDHC_SDCLK_DIV_RSHIFT_V3)) +#define SDHC_SDCLK_DIV_MAX 256 +#define SDHC_SDCLK_DIV_MAX_V3 2046 /* SDHC_CAPABILITIES decoding */ #define SDHC_BASE_FREQ_KHZ(cap) \ diff --git a/sys/dev/sdmmc/sdhcvar.h b/sys/dev/sdmmc/sdhcvar.h index 9d4d759a2bc..7775015ac97 100644 --- a/sys/dev/sdmmc/sdhcvar.h +++ b/sys/dev/sdmmc/sdhcvar.h @@ -1,4 +1,4 @@ -/* $OpenBSD: sdhcvar.h,v 1.10 2017/05/05 15:10:07 kettenis Exp $ */ +/* $OpenBSD: sdhcvar.h,v 1.11 2018/03/19 21:40:32 kettenis Exp $ */ /* * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org> @@ -28,6 +28,7 @@ struct sdhc_softc { struct sdhc_host **sc_host; int sc_nhosts; u_int sc_flags; + u_int sc_clkbase; bus_dma_tag_t sc_dmat; |