mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 11:13:07 +00:00
c69cda25c9
Rename this to be consistent with the change from 'platdata'. Signed-off-by: Simon Glass <sjg@chromium.org>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2018 Cisco Systems, Inc.
|
|
* (C) Copyright 2019 Synamedia
|
|
*
|
|
* Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.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
|
|
|
|
/*
|
|
* This driver has only been tested with eMMC devices; SD devices may
|
|
* not work.
|
|
*/
|
|
struct sdhci_bcmstb_plat {
|
|
struct mmc_config cfg;
|
|
struct mmc mmc;
|
|
};
|
|
|
|
static int sdhci_bcmstb_bind(struct udevice *dev)
|
|
{
|
|
struct sdhci_bcmstb_plat *plat = dev_get_plat(dev);
|
|
|
|
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
|
|
}
|
|
|
|
static int sdhci_bcmstb_probe(struct udevice *dev)
|
|
{
|
|
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
|
|
struct sdhci_bcmstb_plat *plat = dev_get_plat(dev);
|
|
struct sdhci_host *host = dev_get_priv(dev);
|
|
fdt_addr_t base;
|
|
int ret;
|
|
|
|
base = dev_read_addr(dev);
|
|
if (base == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
host->name = dev->name;
|
|
host->ioaddr = (void *)base;
|
|
|
|
ret = mmc_of_parse(dev, &plat->cfg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
host->mmc = &plat->mmc;
|
|
host->mmc->dev = dev;
|
|
ret = sdhci_setup_cfg(&plat->cfg, host,
|
|
BCMSTB_SDHCI_MAXIMUM_CLOCK_FREQUENCY,
|
|
BCMSTB_SDHCI_MINIMUM_CLOCK_FREQUENCY);
|
|
if (ret)
|
|
return ret;
|
|
|
|
upriv->mmc = &plat->mmc;
|
|
host->mmc->priv = host;
|
|
|
|
return sdhci_probe(dev);
|
|
}
|
|
|
|
static const struct udevice_id sdhci_bcmstb_match[] = {
|
|
{ .compatible = "brcm,bcm7425-sdhci" },
|
|
{ .compatible = "brcm,sdhci-brcmstb" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sdhci_bcmstb) = {
|
|
.name = "sdhci-bcmstb",
|
|
.id = UCLASS_MMC,
|
|
.of_match = sdhci_bcmstb_match,
|
|
.ops = &sdhci_ops,
|
|
.bind = sdhci_bcmstb_bind,
|
|
.probe = sdhci_bcmstb_probe,
|
|
.priv_auto = sizeof(struct sdhci_host),
|
|
.plat_auto = sizeof(struct sdhci_bcmstb_plat),
|
|
};
|