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

source/bootloader/u-boot-2020.01/drivers/mmc/pic32_sdhci.c

@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Support of SDHCI for Microchip PIC32 SoC.
+ *
+ * Copyright (C) 2015 Microchip Technology Inc.
+ * Andrei Pistirica <andrei.pistirica@microchip.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <sdhci.h>
+#include <linux/errno.h>
+#include <mach/pic32.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int pic32_sdhci_get_cd(struct sdhci_host *host)
+{
+	/* PIC32 SDHCI CD errata:
+	 * - set CD_TEST and clear CD_TEST_INS bit
+	 */
+	sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
+
+	return 0;
+}
+
+static const struct sdhci_ops pic32_sdhci_ops = {
+	.get_cd	= pic32_sdhci_get_cd,
+};
+
+static int pic32_sdhci_probe(struct udevice *dev)
+{
+	struct sdhci_host *host = dev_get_priv(dev);
+	const void *fdt = gd->fdt_blob;
+	u32 f_min_max[2];
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int ret;
+
+	addr = fdtdec_get_addr_size(fdt, dev_of_offset(dev), "reg", &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	host->ioaddr	= ioremap(addr, size);
+	host->name	= dev->name;
+	host->quirks	= SDHCI_QUIRK_NO_HISPD_BIT;
+	host->bus_width	= fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+					"bus-width", 4);
+	host->ops = &pic32_sdhci_ops;
+
+	ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
+				   "clock-freq-min-max", f_min_max, 2);
+	if (ret) {
+		printf("sdhci: clock-freq-min-max not found\n");
+		return ret;
+	}
+
+	host->max_clk   = f_min_max[1];
+
+	ret = add_sdhci(host, 0, f_min_max[0]);
+	if (ret)
+		return ret;
+	host->mmc->dev = dev;
+
+	return 0;
+}
+
+static const struct udevice_id pic32_sdhci_ids[] = {
+	{ .compatible = "microchip,pic32mzda-sdhci" },
+	{ }
+};
+
+U_BOOT_DRIVER(pic32_sdhci_drv) = {
+	.name			= "pic32_sdhci",
+	.id			= UCLASS_MMC,
+	.of_match		= pic32_sdhci_ids,
+	.probe			= pic32_sdhci_probe,
+	.priv_auto_alloc_size	= sizeof(struct sdhci_host),
+};