diff options
| author | Kinsey Moore <kinsey.moore@oarcorp.com> | 2022-09-15 15:13:39 -0500 |
|---|---|---|
| committer | Joel Sherrill <joel@rtems.org> | 2022-09-16 09:41:49 -0500 |
| commit | 63dae7159f232fde3cc04886e880562e87360cf0 (patch) | |
| tree | c09f8923a5b33566a20d51708d457ea7fd6ec4a1 | |
| parent | arm/lpc: Add option to customize device probes (diff) | |
| download | rtems-libbsd-63dae7159f232fde3cc04886e880562e87360cf0.tar.bz2 | |
rtemsbsd/arasan_sd: Prevent disabled device probe
Probing a SDIO/SDHCI interface that has been disabled by system init via
holding it in reset can cause a CPU hang. This prevents probing of
devices that have been disabled in such a manner on ZynqMP systems.
| -rw-r--r-- | rtemsbsd/sys/dev/sdhci/arasan_sdhci.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/rtemsbsd/sys/dev/sdhci/arasan_sdhci.c b/rtemsbsd/sys/dev/sdhci/arasan_sdhci.c index ccdcb09b..6332260a 100644 --- a/rtemsbsd/sys/dev/sdhci/arasan_sdhci.c +++ b/rtemsbsd/sys/dev/sdhci/arasan_sdhci.c @@ -246,6 +246,31 @@ arasan_sdhci_attach(device_t dev) goto fail; } + /* + * These devices may be disabled by being held in reset. If this is the + * case, a read attempt in its register range will result in a CPU hang. + * Detect this situation and avoid probing the device in this situation. + */ +#if defined(LIBBSP_AARCH64_XILINX_ZYNQMP_BSP_H) + volatile uint32_t *RST_LPD_IOU2_ptr = (uint32_t*)0xFF5E0238; + uint32_t RST_LPD_IOU2 = *RST_LPD_IOU2_ptr; + uint32_t SDIO0_disabled = RST_LPD_IOU2 & (1 << 5); + uint32_t SDIO1_disabled = RST_LPD_IOU2 & (1 << 6); + if ( sc->mem_res == 0xFF160000 ) { + if ( SDIO0_disabled != 0 ) { + device_printf(dev, "SDIO0 disabled\n"); + err = ENXIO; + goto fail; + } + } else { + if ( SDIO1_disabled != 0 ) { + device_printf(dev, "SDIO1 disabled\n"); + err = ENXIO; + goto fail; + } + } +#endif + rid = 0; sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); |