[PATCH v2 11/11] mmc: Add support for ADI SC5XX-family processor SDHCI peripherals
Oliver Gaskell via B4 Relay
devnull+Oliver.Gaskell.analog.com at kernel.org
Wed Sep 25 14:25:21 CEST 2024
From: Oliver Gaskell <Oliver.Gaskell at analog.com>
Co-developed-by: Greg Malysa <greg.malysa at timesys.com>
Signed-off-by: Greg Malysa <greg.malysa at timesys.com>
Co-developed-by: Ian Roberts <ian.roberts at timesys.com>
Signed-off-by: Ian Roberts <ian.roberts at timesys.com>
Signed-off-by: Vasileios Bimpikas <vasileios.bimpikas at analog.com>
Signed-off-by: Utsav Agarwal <utsav.agarwal at analog.com>
Signed-off-by: Arturs Artamonovs <arturs.artamonovs at analog.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison at timesys.com>
Signed-off-by: Oliver Gaskell <Oliver.Gaskell at analog.com>
---
MAINTAINERS | 1 +
drivers/mmc/Kconfig | 9 +++
drivers/mmc/Makefile | 1 +
drivers/mmc/adi_sdhci.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 165 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 669b9953c3..7ba20a8e49 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -616,6 +616,7 @@ F: drivers/dma/adi_dma.c
F: drivers/gpio/adp5588_gpio.c
F: drivers/gpio/gpio-adi-adsp.c
F: drivers/i2c/adi_i2c.c
+F: drivers/mmc/adi_sdhci.c
F: drivers/net/dwc_eth_qos_adi.c
F: drivers/pinctrl/pinctrl-adi-adsp.c
F: drivers/remoteproc/adi_sc5xx_rproc.c
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 982e84dc3b..6ac65a8ba8 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -281,6 +281,15 @@ config MMC_DW_ROCKCHIP
SD 3.0, SDIO 3.0 and MMC 4.5 and supports common eMMC chips as well
as removeable SD and micro-SD cards.
+config MMC_SDHCI_ADI
+ bool "ADI SD/MMC controller support"
+ depends on ARCH_SC5XX
+ depends on DM_MMC && OF_CONTROL
+ depends on MMC_SDHCI && MMC_SDHCI_ADMA
+ help
+ This enables support for the SD/MMC controller included in some Analog
+ Devices SC5XX Socs.
+
config MMC_DW_SOCFPGA
bool "SOCFPGA specific extensions for Synopsys DW Memory Card Interface"
depends on ARCH_SOCFPGA
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 72c3fb66ce..eac8c28ee5 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_MMC_SDHCI_MV) += mv_sdhci.o
obj-$(CONFIG_MMC_SDHCI_NPCM) += npcm_sdhci.o
obj-$(CONFIG_MMC_SDHCI_PIC32) += pic32_sdhci.o
obj-$(CONFIG_MMC_SDHCI_ROCKCHIP) += rockchip_sdhci.o
+obj-$(CONFIG_MMC_SDHCI_ADI) += adi_sdhci.o
obj-$(CONFIG_MMC_SDHCI_S5P) += s5p_sdhci.o
obj-$(CONFIG_MMC_SDHCI_STI) += sti_sdhci.o
obj-$(CONFIG_MMC_SDHCI_TANGIER) += tangier_sdhci.o
diff --git a/drivers/mmc/adi_sdhci.c b/drivers/mmc/adi_sdhci.c
new file mode 100644
index 0000000000..311089a5f5
--- /dev/null
+++ b/drivers/mmc/adi_sdhci.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (C) Copyright 2022 - Analog Devices, Inc.
+ *
+ * Written and/or maintained by Timesys Corporation
+ *
+ * Contact: Nathan Barrett-Morrison <nathan.morrison at timesys.com>
+ * Contact: Greg Malysa <greg.malysa at timesys.com>
+ *
+ * Based on Rockchip's sdhci.c file
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <malloc.h>
+#include <sdhci.h>
+#include <asm/cache.h>
+
+/* 400KHz is max freq for card ID etc. Use that as min */
+#define EMMC_MIN_FREQ 400000
+
+/* Check if an operation crossed a boundary of size ADMA_BOUNDARY_ALIGN */
+#define ADMA_BOUNDARY_ALGN SZ_128M
+#define BOUNDARY_OK(addr, len) \
+ (((addr) | (ADMA_BOUNDARY_ALGN - 1)) == (((addr) + (len) - 1) | \
+ (ADMA_BOUNDARY_ALGN - 1)))
+
+/* We split a descriptor for every crossing of the ADMA alignment boundary,
+ * so we need an additional descriptor for every expected crossing.
+ * As I understand it, the max expected transaction size is:
+ * CONFIG_SYS_MMC_MAX_BLK_COUNT * MMC_MAX_BLOCK_LEN
+ *
+ * With the way the SDHCI-ADMA driver is implemented, if ADMA_MAX_LEN was a
+ * clean power of two, we'd only ever need +1 descriptor as the first
+ * descriptor that got split would then bring the remaining DMA
+ * destination addresses into alignment. Unfortunately, it's currently
+ * hardcoded to a non-power-of-two value.
+ *
+ * If that ever becomes parameterized, ADMA max length can be set to
+ * 0x10000, and set this to 1.
+ */
+#define ADMA_POTENTIAL_CROSSINGS \
+ DIV_ROUND_UP((CONFIG_SYS_MMC_MAX_BLK_COUNT * MMC_MAX_BLOCK_LEN), \
+ ADMA_BOUNDARY_ALGN)
+/* +1 descriptor for each crossing.
+ */
+#define ADMA_TABLE_EXTRA_SZ (ADMA_POTENTIAL_CROSSINGS * ADMA_DESC_LEN)
+
+struct adi_sdhc_plat {
+ struct mmc_config cfg;
+ struct mmc mmc;
+};
+
+struct adi_sdhc {
+ struct sdhci_host host;
+ void *base;
+};
+
+void adi_dwcmshc_adma_write_desc(struct sdhci_host *host, void **desc,
+ dma_addr_t addr, int len, bool end)
+{
+ int tmplen, offset;
+
+ if (likely(!len || BOUNDARY_OK(addr, len))) {
+ sdhci_adma_write_desc(host, desc, addr, len, end);
+ return;
+ }
+
+ offset = addr & (ADMA_BOUNDARY_ALGN - 1);
+ tmplen = ADMA_BOUNDARY_ALGN - offset;
+ sdhci_adma_write_desc(host, desc, addr, tmplen, false);
+
+ addr += tmplen;
+ len -= tmplen;
+ sdhci_adma_write_desc(host, desc, addr, len, end);
+}
+
+struct sdhci_ops adi_dwcmshc_sdhci_ops = {
+ .adma_write_desc = adi_dwcmshc_adma_write_desc,
+};
+
+static int adi_dwcmshc_sdhci_probe(struct udevice *dev)
+{
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct adi_sdhc_plat *plat = dev_get_plat(dev);
+ struct adi_sdhc *prv = dev_get_priv(dev);
+ struct sdhci_host *host = &prv->host;
+ int max_frequency, ret;
+ struct clk clk;
+
+ max_frequency = dev_read_u32_default(dev, "max-frequency", 0);
+ ret = clk_get_by_index(dev, 0, &clk);
+
+ host->quirks = 0;
+ host->max_clk = max_frequency;
+ /*
+ * The sdhci-driver only supports 4bit and 8bit, as sdhci_setup_cfg
+ * doesn't allow us to clear MMC_MODE_4BIT. Consequently, we don't
+ * check for other bus-width values.
+ */
+ if (host->bus_width == 8)
+ host->host_caps |= MMC_MODE_8BIT;
+
+ host->mmc = &plat->mmc;
+ host->mmc->priv = &prv->host;
+ host->mmc->dev = dev;
+ upriv->mmc = host->mmc;
+
+ host->ops = &adi_dwcmshc_sdhci_ops;
+ host->adma_desc_table = memalign(ARCH_DMA_MINALIGN,
+ ADMA_TABLE_SZ + ADMA_TABLE_EXTRA_SZ);
+ host->adma_addr = virt_to_phys(host->adma_desc_table);
+
+ ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
+ if (ret)
+ return ret;
+
+ return sdhci_probe(dev);
+}
+
+static int adi_dwcmshc_sdhci_of_to_plat(struct udevice *dev)
+{
+ struct sdhci_host *host = dev_get_priv(dev);
+
+ host->name = dev->name;
+ host->ioaddr = dev_read_addr_ptr(dev);
+ host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
+
+ return 0;
+}
+
+static int adi_sdhci_bind(struct udevice *dev)
+{
+ struct adi_sdhc_plat *plat = dev_get_plat(dev);
+
+ return sdhci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id adi_dwcmshc_sdhci_ids[] = {
+ { .compatible = "adi,dwc-sdhci" },
+ { }
+};
+
+U_BOOT_DRIVER(adi_dwcmshc_sdhci_drv) = {
+ .name = "adi_sdhci",
+ .id = UCLASS_MMC,
+ .of_match = adi_dwcmshc_sdhci_ids,
+ .of_to_plat = adi_dwcmshc_sdhci_of_to_plat,
+ .ops = &sdhci_ops,
+ .bind = adi_sdhci_bind,
+ .probe = adi_dwcmshc_sdhci_probe,
+ .priv_auto = sizeof(struct adi_sdhc),
+ .plat_auto = sizeof(struct adi_sdhc_plat),
+};
--
2.34.1
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