Author: jmcneill
Date: Tue Apr 26 12:02:36 2016
New Revision: 298630
URL: https://svnweb.freebsd.org/changeset/base/298630
Log:
Add support for 8-bit eMMC.
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).
Modified:
head/sys/arm/allwinner/a10_mmc.c
Modified: head/sys/arm/allwinner/a10_mmc.c
==============================================================================
--- head/sys/arm/allwinner/a10_mmc.c Tue Apr 26 12:00:04 2016
(r298629)
+++ head/sys/arm/allwinner/a10_mmc.c Tue Apr 26 12:02:36 2016
(r298630)
@@ -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) {
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