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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Synopsys DesignWare Multimedia Card Interface driver
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+ * extensions used in StarFive JH 7100.
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+ *
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+ * Copyright (C) 2019 Synopsys
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+ * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
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+ * Modified by StarFive Technology
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+ */
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+
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+#include <common.h>
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+#include <clk.h>
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+#include <dm.h>
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+#include <dwmmc.h>
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+#include <errno.h>
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+#include <fdtdec.h>
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+#include <dm/device_compat.h>
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+#include <linux/libfdt.h>
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+#include <linux/err.h>
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+#include <malloc.h>
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+
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+#define CLOCK_MIN 400000 /* 400 kHz */
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+#define FIFO_MIN 8
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+#define FIFO_MAX 4096
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+#define DWMMC_BUS_FREQ 100000000
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+
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+struct starfive_jh_dwmci_plat {
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+ struct mmc_config cfg;
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+ struct mmc mmc;
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+};
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+
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+struct starfive_jh_dwmci_priv_data {
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+ struct dwmci_host host;
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+ u32 f_max;
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+};
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+
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+static int starfive_jh_dwmmc_of_to_plat(struct udevice *dev)
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+{
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+ struct starfive_jh_dwmci_priv_data *priv = dev_get_priv(dev);
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+ struct dwmci_host *host = &priv->host;
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+ u32 fifo_depth;
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+ int ret;
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+
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+ host->ioaddr = dev_read_addr_ptr(dev);
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+
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+ /*
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+ * If fifo-depth is unset don't set fifoth_val - we will try to
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+ * auto detect it.
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+ */
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+ ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
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+ if (!ret) {
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+ if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
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+ return -EINVAL;
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+ }
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+ host->fifoth_val = MSIZE(0x2) |
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+ RX_WMARK(fifo_depth / 2 - 1) |
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+ TX_WMARK(fifo_depth / 2);
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+
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+
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+ host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
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+ if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
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+ return -EINVAL;
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+
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+ /*
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+ * If max-frequency is unset don't set priv->f_max - we will use
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+ * host->bus_hz in probe() instead.
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+ */
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+ ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
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+ if (!ret && priv->f_max < CLOCK_MIN)
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+ return -EINVAL;
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+
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+// host->fifo_mode = dev_read_bool(dev, "fifo-mode");
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+ host->name = dev->name;
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+ host->dev_index = 0;
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+ host->priv = priv;
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+
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+ return 0;
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+}
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+
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+int starfive_jh_dwmmc_getcd(struct udevice *dev)
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+{
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+ struct starfive_jh_dwmci_priv_data *priv = dev_get_priv(dev);
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+ struct dwmci_host *host = &priv->host;
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+
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+ u32 ret = dwmci_readl(host, DWMCI_CDETECT);
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+#if CONFIG_IS_ENABLED(TARGET_STARFIVE_JH7100)
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+ printf("MMC CD is 0x%x, force to True.\n", ret);
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+ return 1;
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+#else
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+ return !(ret & 1);
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+#endif
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+}
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+
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+struct dm_mmc_ops starfive_jh_dwmci_dm_ops;
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+
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+static int starfive_jh_dwmmc_probe(struct udevice *dev)
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+{
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+#ifdef CONFIG_BLK
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+ struct starfive_jh_dwmci_plat *plat = dev_get_plat(dev);
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+#else
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+ int ret;
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+#endif
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+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
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+ struct starfive_jh_dwmci_priv_data *priv = dev_get_priv(dev);
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+ struct dwmci_host *host = &priv->host;
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+ unsigned int clock_max;
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+
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+ /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
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+ memcpy(&starfive_jh_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
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+ starfive_jh_dwmci_dm_ops.get_cd = starfive_jh_dwmmc_getcd;
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+
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+ host->bus_hz = DWMMC_BUS_FREQ;
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+
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+ if (!priv->f_max)
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+ clock_max = host->bus_hz;
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+ else
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+ clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
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+
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+#ifdef CONFIG_BLK
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+ dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
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+ host->mmc = &plat->mmc;
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+#else
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+ ret = add_dwmci(host, clock_max, CLOCK_MIN);
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+ if (ret)
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+ return ret;
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+#endif
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+ host->mmc->priv = &priv->host;
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+ upriv->mmc = host->mmc;
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+ host->mmc->dev = dev;
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+
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+ return dwmci_probe(dev);
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+}
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+
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+static int starfive_jh_dwmmc_bind(struct udevice *dev)
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+{
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+#ifdef CONFIG_BLK
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+ struct starfive_jh_dwmci_plat *plat = dev_get_plat(dev);
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+ int ret;
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+
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+ ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
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+ if (ret)
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+ return ret;
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+#endif
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id starfive_jh_dwmmc_ids[] = {
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+ { .compatible = "snps,dw-mshc" },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(starfive_jh_dwmmc_drv) = {
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+ .name = "JH DWMMC0",
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+ .id = UCLASS_MMC,
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+ .of_match = starfive_jh_dwmmc_ids,
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+ .of_to_plat = starfive_jh_dwmmc_of_to_plat,
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+ .ops = &starfive_jh_dwmci_dm_ops,
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+ .bind = starfive_jh_dwmmc_bind,
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+ .probe = starfive_jh_dwmmc_probe,
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+ .priv_auto = sizeof(struct starfive_jh_dwmci_priv_data),
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+ .plat_auto = sizeof(struct starfive_jh_dwmci_plat),
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+};
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