[U-Boot] [PATCH v2] socfpga/dwmmc: Adding DesignWare MMC driver support for SOCFPGA

Chin Liang See
2013-12-18T17:16:27Z

To add the DesignWare MMC driver support for Altera SOCFPGA. It
required information such as clocks and bus width from platform
specific files (SOCFPGA handoff files)

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Andy Fleming <afleming@freescale.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
---
Changes for v2
- Adding u-boot-mmc maintainer
---
arch/arm/include/asm/arch-socfpga/dwmmc.h | 12 +++++
drivers/mmc/Makefile | 1 +
drivers/mmc/socfpga_dw_mmc.c | 72 +++++++++++++++++++++++++++++
3 files changed, 85 insertions(+)
create mode 100755 arch/arm/include/asm/arch-socfpga/dwmmc.h
create mode 100755 drivers/mmc/socfpga_dw_mmc.c

diff --git a/arch/arm/include/asm/arch-socfpga/dwmmc.h b/arch/arm/include/asm/arch-socfpga/dwmmc.h
new file mode 100755
index 0000000..945eb64
--- /dev/null
+++ b/arch/arm/include/asm/arch-socfpga/dwmmc.h
@@ -0,0 +1,12 @@
+/*
+ * (C) Copyright 2013 Altera Corporation <www.altera.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _SOCFPGA_DWMMC_H_
+#define _SOCFPGA_DWMMC_H_
+
+extern int socfpga_dwmmc_init(u32 regbase, int bus_width, int index);
+
+#endif /* _SOCFPGA_SDMMC_H_ */
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 1ed26ca..e793ed9 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_TEGRA_MMC) += tegra_mmc.o
obj-$(CONFIG_DWMMC) += dw_mmc.o
obj-$(CONFIG_EXYNOS_DWMMC) += exynos_dw_mmc.o
obj-$(CONFIG_ZYNQ_SDHCI) += zynq_sdhci.o
+obj-$(CONFIG_SOCFPGA_DWMMC) += socfpga_dw_mmc.o
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_SPL_MMC_BOOT) += fsl_esdhc_spl.o
else
diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
new file mode 100755
index 0000000..554f51b
--- /dev/null
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2013 Altera Corporation <www.altera.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <dwmmc.h>
+#include <asm/arch/dwmmc.h>
+
+#define CLKMGR_PERPLLGRP_EN_REG (SOCFPGA_CLKMGR_ADDRESS + 0xA0)
+#define CLKMGR_SDMMC_CLK_ENABLE (1 << 8)
+#define SYSMGR_SDMMCGRP_CTRL_REG (SOCFPGA_SYSMGR_ADDRESS + 0x108)
+#define SYSMGR_SDMMC_CTRL_GET_DRVSEL(x) (((x) >> 0) & 0x7)
+#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
+ ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38))
+
+static char *SOCFPGA_NAME = "SOCFPGA DWMMC";
+
+static void socfpga_dwmci_clksel(struct dwmci_host *host)
+{
+ unsigned int en;
+ unsigned int drvsel;
+ unsigned int smplsel;
+
+ /* Disable SDMMC clock. */
+ en = readl(CLKMGR_PERPLLGRP_EN_REG);
+ en &= ~CLKMGR_SDMMC_CLK_ENABLE;
+ writel(en, CLKMGR_PERPLLGRP_EN_REG);
+
+ /* Configures drv_sel and smpl_sel */
+ drvsel = 3;
+ smplsel = 0;
+
+ debug("%s: drvsel %d smplsel %d\n", __FUNCTION__, drvsel, smplsel);
+ writel(SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel),
+ SYSMGR_SDMMCGRP_CTRL_REG);
+
+ debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __FUNCTION__,
+ readl(SYSMGR_SDMMCGRP_CTRL_REG));
+ /* Enable SDMMC clock */
+ en = readl(CLKMGR_PERPLLGRP_EN_REG);
+ en |= CLKMGR_SDMMC_CLK_ENABLE;
+ writel(en, CLKMGR_PERPLLGRP_EN_REG);
+}
+
+int socfpga_dwmmc_init(u32 regbase, int bus_width, int index)
+{
+ struct dwmci_host *host = NULL;
+ host = calloc(sizeof(struct dwmci_host), 1);
+ if (!host) {
+ printf("dwmci_host calloc fail!\n");
+ return 1;
+ }
+
+ host->name = SOCFPGA_NAME;
+ host->ioaddr = (void *)regbase;
+ host->buswidth = bus_width;
+ host->clksel = socfpga_dwmci_clksel;
+ host->dev_index = index;
+ /* fixed clock divide by 4 which due to the SDMMC wrapper */
+ host->bus_hz = CONFIG_DWMMC_BUS_HZ;
+ host->fifoth_val = MSIZE(0x2) |
+ RX_WMARK(CONFIG_DWMMC_FIFO_DEPTH / 2 - 1) |
+ TX_WMARK(CONFIG_DWMMC_FIFO_DEPTH / 2);
+
+ add_dwmci(host, host->bus_hz, 400000);
+
+ return 0;
+}
+
--
1.7.9.5