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authorShunqian Zheng <zhengsq@rock-chips.com>2016-05-02 10:27:30 +0800
committerMartin Roth <martinroth@google.com>2016-05-18 20:23:42 +0200
commit462e14139e4990caa23d23476e60f5d3ba95c9aa (patch)
treef0b9d4f8270633bc75d66e50ec364f3152742c03 /src/soc/rockchip
parent2f7ed8d775153db69d19c77cc79db9b0bb136c70 (diff)
rockchip: rk3399: enable sdhci clk for emmc
If booting from sdcard/usb, kernel can't recognize the /dev/mmcblk0. Before kernel find it's root cause, we add this workaround patch to enable clk for emmc. BRANCH=none BUG=chrome-os-partner:52873 TEST=boot from sdcard and check the /dev/mmcblk0 exists Change-Id: Ie36cc6fdbc24db8c30984c02ccfe2f8aaaf30cd2 Signed-off-by: Martin Roth <martinroth@google.com> Original-Commit-Id: 39b87ec3c73d6f56efc8c3f52b7ed759e548ee85 Original-Change-Id: I88a9cc2e3ea5a56aadfdbd94ef910daaf92a7eb7 Original-Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com> Original-Reviewed-on: https://chromium-review.googlesource.com/341632 Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org> Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://review.coreboot.org/14856 Tested-by: build bot (Jenkins) Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Diffstat (limited to 'src/soc/rockchip')
-rw-r--r--src/soc/rockchip/rk3399/Makefile.inc1
-rw-r--r--src/soc/rockchip/rk3399/emmc.c50
-rw-r--r--src/soc/rockchip/rk3399/include/soc/emmc.h16
3 files changed, 67 insertions, 0 deletions
diff --git a/src/soc/rockchip/rk3399/Makefile.inc b/src/soc/rockchip/rk3399/Makefile.inc
index 9af451c08c..68f346c85e 100644
--- a/src/soc/rockchip/rk3399/Makefile.inc
+++ b/src/soc/rockchip/rk3399/Makefile.inc
@@ -55,6 +55,7 @@ ramstage-y += sdram.c
ramstage-y += ../common/spi.c
ramstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c
ramstage-y += clock.c
+ramstage-y += emmc.c
ramstage-y += ../common/gpio.c
ramstage-y += gpio.c
ramstage-y += ../common/i2c.c
diff --git a/src/soc/rockchip/rk3399/emmc.c b/src/soc/rockchip/rk3399/emmc.c
new file mode 100644
index 0000000000..b8519f7796
--- /dev/null
+++ b/src/soc/rockchip/rk3399/emmc.c
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/addressmap.h>
+#include <soc/emmc.h>
+
+#define SDHCI_CLOCK_CONTROL 0x2c
+#define SDHCI_CLOCK_CARD_EN 0x0004
+#define SDHCI_CLOCK_INT_STABLE 0x0002
+#define SDHCI_CLOCK_INT_EN 0x0001
+
+/* TODO(crosbug.com/p/52873): We actually don't need to set clk for
+ * emmc once kernel fix it's bug.
+ */
+void enable_emmc_clk(void)
+{
+ int timeout, clk;
+
+ write32((void *)(EMMC_BASE + SDHCI_CLOCK_CONTROL), SDHCI_CLOCK_INT_EN);
+
+ /* Wait max 20 ms */
+ timeout = 20;
+ while (!((clk = read32((void *)(EMMC_BASE + SDHCI_CLOCK_CONTROL)))
+ & SDHCI_CLOCK_INT_STABLE)) {
+ if (timeout == 0) {
+ printk(BIOS_ERR, "Internal clock never stabilised.\n");
+ return;
+ }
+ timeout--;
+ udelay(1000);
+ }
+
+ clk |= SDHCI_CLOCK_CARD_EN;
+ write32((void *)(EMMC_BASE + SDHCI_CLOCK_CONTROL), clk);
+}
diff --git a/src/soc/rockchip/rk3399/include/soc/emmc.h b/src/soc/rockchip/rk3399/include/soc/emmc.h
new file mode 100644
index 0000000000..0d29d9e138
--- /dev/null
+++ b/src/soc/rockchip/rk3399/include/soc/emmc.h
@@ -0,0 +1,16 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+void enable_emmc_clk(void);