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Add support for 8-bit eMMC.

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Set MMC_CAP_4_BIT_DATA and MMC_CAP_8_BIT_DATA based on the "bus-width"
DT property and reduce maximum bus frequency from 52MHz to 50MHz to match
the capabilities of the clock provider.

Tested on a BananaPi BPI-M3 (A83T).
This commit is contained in:
Jared McNeill 2016-04-26 12:02:36 +00:00
parent 30b72b6871
commit fc0424631d
1 changed files with 12 additions and 2 deletions
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14
sys/arm/allwinner/a10_mmc.c
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@ -152,8 +152,11 @@ a10_mmc_attach(device_t dev)
struct a10_mmc_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid_list *tree;
uint32_t bus_width;
phandle_t node;
int error;
node = ofw_bus_get_node(dev);
sc = device_get_softc(dev);
sc->a10_dev = dev;
sc->a10_req = NULL;
@ -251,11 +254,18 @@ a10_mmc_attach(device_t dev)
device_printf(sc->a10_dev, "DMA status: %s\n",
a10_mmc_pio_mode ? "disabled" : "enabled");
if (OF_getencprop(node, "bus-width", &bus_width, sizeof(uint32_t)) <= 0)
bus_width = 1;
sc->a10_host.f_min = 400000;
sc->a10_host.f_max = 52000000;
sc->a10_host.f_max = 50000000;
sc->a10_host.host_ocr = MMC_OCR_320_330 | MMC_OCR_330_340;
sc->a10_host.caps = MMC_CAP_4_BIT_DATA | MMC_CAP_HSPEED;
sc->a10_host.mode = mode_sd;
sc->a10_host.caps = MMC_CAP_HSPEED;
if (bus_width >= 4)
sc->a10_host.caps |= MMC_CAP_4_BIT_DATA;
if (bus_width >= 8)
sc->a10_host.caps |= MMC_CAP_8_BIT_DATA;
child = device_add_child(dev, "mmc", -1);
if (child == NULL) {