GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/mmc/socfpga_dw_mmc.c

@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2013 Altera Corporation <www.altera.com>
+ */
+
+#include <common.h>
+#include <asm/arch/clock_manager.h>
+#include <asm/arch/system_manager.h>
+#include <clk.h>
+#include <dm.h>
+#include <dwmmc.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <linux/libfdt.h>
+#include <linux/err.h>
+#include <malloc.h>
+#include <reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct socfpga_clock_manager *clock_manager_base =
+		(void *)SOCFPGA_CLKMGR_ADDRESS;
+static const struct socfpga_system_manager *system_manager_base =
+		(void *)SOCFPGA_SYSMGR_ADDRESS;
+
+struct socfpga_dwmci_plat {
+	struct mmc_config cfg;
+	struct mmc mmc;
+};
+
+/* socfpga implmentation specific driver private data */
+struct dwmci_socfpga_priv_data {
+	struct dwmci_host	host;
+	unsigned int		drvsel;
+	unsigned int		smplsel;
+};
+
+static void socfpga_dwmci_reset(struct udevice *dev)
+{
+	struct reset_ctl_bulk reset_bulk;
+	int ret;
+
+	ret = reset_get_bulk(dev, &reset_bulk);
+	if (ret) {
+		dev_warn(dev, "Can't get reset: %d\n", ret);
+		return;
+	}
+
+	reset_deassert_bulk(&reset_bulk);
+}
+
+static void socfpga_dwmci_clksel(struct dwmci_host *host)
+{
+	struct dwmci_socfpga_priv_data *priv = host->priv;
+	u32 sdmmc_mask = ((priv->smplsel & 0x7) << SYSMGR_SDMMC_SMPLSEL_SHIFT) |
+			 ((priv->drvsel & 0x7) << SYSMGR_SDMMC_DRVSEL_SHIFT);
+
+	/* Disable SDMMC clock. */
+	clrbits_le32(&clock_manager_base->per_pll.en,
+		CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
+
+	debug("%s: drvsel %d smplsel %d\n", __func__,
+	      priv->drvsel, priv->smplsel);
+	writel(sdmmc_mask, &system_manager_base->sdmmcgrp_ctrl);
+
+	debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
+		readl(&system_manager_base->sdmmcgrp_ctrl));
+
+	/* Enable SDMMC clock */
+	setbits_le32(&clock_manager_base->per_pll.en,
+		CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
+}
+
+static int socfpga_dwmmc_get_clk_rate(struct udevice *dev)
+{
+	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+#if CONFIG_IS_ENABLED(CLK)
+	struct clk clk;
+	int ret;
+
+	ret = clk_get_by_index(dev, 1, &clk);
+	if (ret)
+		return ret;
+
+	host->bus_hz = clk_get_rate(&clk);
+
+	clk_free(&clk);
+#else
+	/* Fixed clock divide by 4 which due to the SDMMC wrapper */
+	host->bus_hz = cm_get_mmc_controller_clk_hz();
+#endif
+	if (host->bus_hz == 0) {
+		printf("DWMMC: MMC clock is zero!");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
+{
+	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+	int fifo_depth;
+
+	fifo_depth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+				    "fifo-depth", 0);
+	if (fifo_depth < 0) {
+		printf("DWMMC: Can't get FIFO depth\n");
+		return -EINVAL;
+	}
+
+	host->name = dev->name;
+	host->ioaddr = (void *)devfdt_get_addr(dev);
+	host->buswidth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+					"bus-width", 4);
+	host->clksel = socfpga_dwmci_clksel;
+
+	/*
+	 * TODO(sjg@chromium.org): Remove the need for this hack.
+	 * We only have one dwmmc block on gen5 SoCFPGA.
+	 */
+	host->dev_index = 0;
+	host->fifoth_val = MSIZE(0x2) |
+		RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
+	priv->drvsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
+				       "drvsel", 3);
+	priv->smplsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
+					"smplsel", 0);
+	host->priv = priv;
+
+	return 0;
+}
+
+static int socfpga_dwmmc_probe(struct udevice *dev)
+{
+#ifdef CONFIG_BLK
+	struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
+#endif
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
+	struct dwmci_host *host = &priv->host;
+	int ret;
+
+	ret = socfpga_dwmmc_get_clk_rate(dev);
+	if (ret)
+		return ret;
+
+	socfpga_dwmci_reset(dev);
+
+#ifdef CONFIG_BLK
+	dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
+	host->mmc = &plat->mmc;
+#else
+
+	ret = add_dwmci(host, host->bus_hz, 400000);
+	if (ret)
+		return ret;
+#endif
+	host->mmc->priv = &priv->host;
+	upriv->mmc = host->mmc;
+	host->mmc->dev = dev;
+
+	return dwmci_probe(dev);
+}
+
+static int socfpga_dwmmc_bind(struct udevice *dev)
+{
+#ifdef CONFIG_BLK
+	struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
+	int ret;
+
+	ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
+	if (ret)
+		return ret;
+#endif
+
+	return 0;
+}
+
+static const struct udevice_id socfpga_dwmmc_ids[] = {
+	{ .compatible = "altr,socfpga-dw-mshc" },
+	{ }
+};
+
+U_BOOT_DRIVER(socfpga_dwmmc_drv) = {
+	.name		= "socfpga_dwmmc",
+	.id		= UCLASS_MMC,
+	.of_match	= socfpga_dwmmc_ids,
+	.ofdata_to_platdata = socfpga_dwmmc_ofdata_to_platdata,
+	.ops		= &dm_dwmci_ops,
+	.bind		= socfpga_dwmmc_bind,
+	.probe		= socfpga_dwmmc_probe,
+	.priv_auto_alloc_size = sizeof(struct dwmci_socfpga_priv_data),
+	.platdata_auto_alloc_size = sizeof(struct socfpga_dwmci_plat),
+};