diff options
author | Thomas Fitzsimmons <fitzsim@fitzsim.org> | 2018-06-08 17:59:45 -0400 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2018-07-10 16:55:57 -0400 |
commit | 894c3ad27fa940beb7fdc07d01dcfe81c03d0481 (patch) | |
tree | 72abb68850e0fc01f0fd0c6f0c2152afda435ffd /drivers/mmc | |
parent | d154ca60036f060375ff3d80b2f1fbd2cd7de115 (diff) |
board: arm: Add support for Broadcom BCM7445
Add support for loading U-Boot on the Broadcom 7445 SoC. This port
assumes Broadcom's BOLT bootloader is acting as the second stage
bootloader, and U-Boot is acting as the third stage bootloader, loaded
as an ELF program by BOLT.
Signed-off-by: Thomas Fitzsimmons <fitzsim@fitzsim.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/Kconfig | 11 | ||||
-rw-r--r-- | drivers/mmc/Makefile | 1 | ||||
-rw-r--r-- | drivers/mmc/bcmstb_sdhci.c | 67 |
3 files changed, 79 insertions, 0 deletions
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 693b3ceaf0..377b1c4b3b 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -379,6 +379,17 @@ config MMC_SDHCI_BCM2835 If unsure, say N. +config MMC_SDHCI_BCMSTB + tristate "SDHCI support for the BCMSTB SD/MMC Controller" + depends on MMC_SDHCI + help + This selects the Broadcom set-top box SD/MMC controller. + + If you have a BCMSTB platform with SD or MMC devices, + say Y here. + + If unsure, say N. + config MMC_SDHCI_CADENCE bool "SDHCI support for the Cadence SD/SDIO/eMMC controller" depends on BLK && DM_MMC diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile index 3a9805dad9..f6191862d6 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -45,6 +45,7 @@ obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o obj-$(CONFIG_MMC_SDHCI) += sdhci.o obj-$(CONFIG_MMC_SDHCI_ATMEL) += atmel_sdhci.o obj-$(CONFIG_MMC_SDHCI_BCM2835) += bcm2835_sdhci.o +obj-$(CONFIG_MMC_SDHCI_BCMSTB) += bcmstb_sdhci.o obj-$(CONFIG_MMC_SDHCI_CADENCE) += sdhci-cadence.o obj-$(CONFIG_MMC_SDHCI_KONA) += kona_sdhci.o obj-$(CONFIG_MMC_SDHCI_MSM) += msm_sdhci.o diff --git a/drivers/mmc/bcmstb_sdhci.c b/drivers/mmc/bcmstb_sdhci.c new file mode 100644 index 0000000000..443ae8d481 --- /dev/null +++ b/drivers/mmc/bcmstb_sdhci.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 Cisco Systems, Inc. + * + * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org> + */ + +#include <common.h> +#include <mach/sdhci.h> +#include <malloc.h> +#include <sdhci.h> + +/* + * The BCMSTB SDHCI has a quirk in that its actual maximum frequency + * capability is 100 MHz. The divisor that is eventually written to + * SDHCI_CLOCK_CONTROL is calculated based on what the MMC device + * reports, and relative to this maximum frequency. + * + * This define used to be set to 52000000 (52 MHz), the desired + * maximum frequency, but that would result in the communication + * actually running at 100 MHz (seemingly without issue), which is + * out-of-spec. + * + * Now, by setting this to 0 (auto-detect), 100 MHz will be read from + * the capabilities register, and the resulting divisor will be + * doubled, meaning that the clock control register will be set to the + * in-spec 52 MHz value. + */ +#define BCMSTB_SDHCI_MAXIMUM_CLOCK_FREQUENCY 0 +/* + * When the minimum clock frequency is set to 0 (auto-detect), U-Boot + * sets it to 100 MHz divided by SDHCI_MAX_DIV_SPEC_300, or 48,875 Hz, + * which results in the controller timing out when trying to + * communicate with the MMC device. Hard-code this value to 400000 + * (400 kHz) to prevent this. + */ +#define BCMSTB_SDHCI_MINIMUM_CLOCK_FREQUENCY 400000 + +static char *BCMSTB_SDHCI_NAME = "bcmstb-sdhci"; + +/* + * This driver has only been tested with eMMC devices; SD devices may + * not work. + */ +int bcmstb_sdhci_init(phys_addr_t regbase) +{ + struct sdhci_host *host = NULL; + + host = (struct sdhci_host *)malloc(sizeof(struct sdhci_host)); + if (!host) { + printf("%s: Failed to allocate memory\n", __func__); + return 1; + } + memset(host, 0, sizeof(*host)); + + host->name = BCMSTB_SDHCI_NAME; + host->ioaddr = (void *)regbase; + host->quirks = 0; + + host->cfg.part_type = PART_TYPE_DOS; + + host->version = sdhci_readw(host, SDHCI_HOST_VERSION); + + return add_sdhci(host, + BCMSTB_SDHCI_MAXIMUM_CLOCK_FREQUENCY, + BCMSTB_SDHCI_MINIMUM_CLOCK_FREQUENCY); +} |