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// SPDX-License-Identifier: GPL-2.0-only
/*
* sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
*
* Copyright (C) 2015 Broadcom Corporation
*/
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/bitops.h>
#include "sdhci-pltfm.h"
#define SDHCI_VENDOR 0x78
#define SDHCI_VENDOR_ENHANCED_STRB 0x1
#define BRCMSTB_PRIV_FLAGS_NO_64BIT BIT(0)
#define BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT BIT(1)
struct sdhci_brcmstb_priv {
void __iomem *cfg_regs;
};
struct brcmstb_match_priv {
void (*hs400es)(struct mmc_host *mmc, struct mmc_ios *ios);
unsigned int flags;
};
static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
u32 reg;
dev_dbg(mmc_dev(mmc), "%s(): Setting HS400-Enhanced-Strobe mode\n",
__func__);
reg = readl(host->ioaddr + SDHCI_VENDOR);
if (ios->enhanced_strobe)
reg |= SDHCI_VENDOR_ENHANCED_STRB;
else
reg &= ~SDHCI_VENDOR_ENHANCED_STRB;
writel(reg, host->ioaddr + SDHCI_VENDOR);
}
static const struct sdhci_ops sdhci_brcmstb_ops = {
.set_clock = sdhci_set_clock,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
.ops = &sdhci_brcmstb_ops,
};
static const struct brcmstb_match_priv match_priv_7425 = {
.flags = BRCMSTB_PRIV_FLAGS_NO_64BIT |
BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT,
};
static const struct brcmstb_match_priv match_priv_7445 = {
.flags = BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT,
};
static const struct brcmstb_match_priv match_priv_7216 = {
.hs400es = sdhci_brcmstb_hs400es,
};
static const struct of_device_id sdhci_brcm_of_match[] = {
{ .compatible = "brcm,bcm7425-sdhci", .data = &match_priv_7425 },
{ .compatible = "brcm,bcm7445-sdhci", .data = &match_priv_7445 },
{ .compatible = "brcm,bcm7216-sdhci", .data = &match_priv_7216 },
{},
};
static int sdhci_brcmstb_probe(struct platform_device *pdev)
{
const struct brcmstb_match_priv *match_priv;
struct sdhci_pltfm_host *pltfm_host;
const struct of_device_id *match;
struct sdhci_brcmstb_priv *priv;
struct sdhci_host *host;
struct resource *iomem;
struct clk *clk;
int res;
match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
match_priv = match->data;
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_err(&pdev->dev, "Clock not found in Device Tree\n");
clk = NULL;
}
res = clk_prepare_enable(clk);
if (res)
return res;
host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata,
sizeof(struct sdhci_brcmstb_priv));
if (IS_ERR(host)) {
res = PTR_ERR(host);
goto err_clk;
}
pltfm_host = sdhci_priv(host);
priv = sdhci_pltfm_priv(pltfm_host);
/* Map in the non-standard CFG registers */
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
priv->cfg_regs = devm_ioremap_resource(&pdev->dev, iomem);
if (IS_ERR(priv->cfg_regs)) {
res = PTR_ERR(priv->cfg_regs);
goto err;
}
sdhci_get_of_property(pdev);
res = mmc_of_parse(host->mmc);
if (res)
goto err;
/*
* If the chip has enhanced strobe and it's enabled, add
* callback
*/
if (match_priv->hs400es &&
(host->mmc->caps2 & MMC_CAP2_HS400_ES))
host->mmc_host_ops.hs400_enhanced_strobe = match_priv->hs400es;
/*
* Supply the existing CAPS, but clear the UHS modes. This
* will allow these modes to be specified by device tree
* properties through mmc_of_parse().
*/
host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
if (match_priv->flags & BRCMSTB_PRIV_FLAGS_NO_64BIT)
host->caps &= ~SDHCI_CAN_64BIT;
host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
SDHCI_SUPPORT_DDR50);
host->quirks |= SDHCI_QUIRK_MISSING_CAPS;
if (match_priv->flags & BRCMSTB_PRIV_FLAGS_BROKEN_TIMEOUT)
host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
res = sdhci_add_host(host);
if (res)
goto err;
pltfm_host->clk = clk;
return res;
err:
sdhci_pltfm_free(pdev);
err_clk:
clk_disable_unprepare(clk);
return res;
}
MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
static struct platform_driver sdhci_brcmstb_driver = {
.driver = {
.name = "sdhci-brcmstb",
.pm = &sdhci_pltfm_pmops,
.of_match_table = of_match_ptr(sdhci_brcm_of_match),
},
.probe = sdhci_brcmstb_probe,
.remove = sdhci_pltfm_unregister,
};
module_platform_driver(sdhci_brcmstb_driver);
MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
MODULE_AUTHOR("Broadcom");
MODULE_LICENSE("GPL v2");
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