mmc: mv_sdhci: Configure the SDHCI MBUS bridge windows

This driver did not yet configure the SDHCI MBUS bridge registers.
Without this and with CONFIG_MMC_SDMA enabled, mmc hangs at random
times. As DMA cannot complete correctly.

Tested on db-88f6820-gp eval board.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Dirk Eibach <eibach@gdsys.cc>
Tested-by: Kevin Smith <kevin.smith@elecsyscorp.com>

diff --git a/drivers/mmc/mv_sdhci.c b/drivers/mmc/mv_sdhci.c
index 75fa014..82c695f 100644 (file)
--- a/drivers/mmc/mv_sdhci.c
+++ b/drivers/mmc/mv_sdhci.c
@@ -1,6 +1,41 @@
+/*
+ * Marvell SD Host Controller Interface
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
 #include <common.h>
 #include <malloc.h>
 #include <sdhci.h>
+#include <linux/mbus.h>
+
+#define SDHCI_WINDOW_CTRL(win)         (0x4080 + ((win) << 4))
+#define SDHCI_WINDOW_BASE(win)         (0x4084 + ((win) << 4))
+
+static void sdhci_mvebu_mbus_config(void __iomem *base)
+{
+       const struct mbus_dram_target_info *dram;
+       int i;
+
+       dram = mvebu_mbus_dram_info();
+
+       for (i = 0; i < 4; i++) {
+               writel(0, base + SDHCI_WINDOW_CTRL(i));
+               writel(0, base + SDHCI_WINDOW_BASE(i));
+       }
+
+       for (i = 0; i < dram->num_cs; i++) {
+               const struct mbus_dram_window *cs = dram->cs + i;
+
+               /* Write size, attributes and target id to control register */
+               writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
+                      (dram->mbus_dram_target_id << 4) | 1,
+                      base + SDHCI_WINDOW_CTRL(i));
+
+               /* Write base address to base register */
+               writel(cs->base, base + SDHCI_WINDOW_BASE(i));
+       }
+}
 
 #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
 static struct sdhci_ops mv_ops;
@@ -47,6 +82,12 @@ int mv_sdh_init(unsigned long regbase, u32 max_clk, u32 min_clk, u32 quirks)
        mv_ops.write_b = mv_sdhci_writeb;
        host->ops = &mv_ops;
 #endif
+
+       if (CONFIG_IS_ENABLED(ARCH_MVEBU)) {
+               /* Configure SDHCI MBUS mbus bridge windows */
+               sdhci_mvebu_mbus_config((void __iomem *)regbase);
+       }
+
        if (quirks & SDHCI_QUIRK_REG32_RW)
                host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;
        else