From 462e14139e4990caa23d23476e60f5d3ba95c9aa Mon Sep 17 00:00:00 2001 From: Shunqian Zheng Date: Mon, 2 May 2016 10:27:30 +0800 Subject: 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 Original-Commit-Id: 39b87ec3c73d6f56efc8c3f52b7ed759e548ee85 Original-Change-Id: I88a9cc2e3ea5a56aadfdbd94ef910daaf92a7eb7 Original-Signed-off-by: Shunqian Zheng Original-Reviewed-on: https://chromium-review.googlesource.com/341632 Original-Commit-Ready: Vadim Bendebury Original-Tested-by: Vadim Bendebury Original-Reviewed-by: Vadim Bendebury Reviewed-on: https://review.coreboot.org/14856 Tested-by: build bot (Jenkins) Reviewed-by: Vadim Bendebury --- src/soc/rockchip/rk3399/Makefile.inc | 1 + src/soc/rockchip/rk3399/emmc.c | 50 ++++++++++++++++++++++++++++++ src/soc/rockchip/rk3399/include/soc/emmc.h | 16 ++++++++++ 3 files changed, 67 insertions(+) create mode 100644 src/soc/rockchip/rk3399/emmc.c create mode 100644 src/soc/rockchip/rk3399/include/soc/emmc.h (limited to 'src/soc') 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 +#include +#include +#include +#include + +#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); -- cgit v1.2.3