mirror of https://github.com/hak5/openwrt-owl.git
1744 lines
45 KiB
Diff
1744 lines
45 KiB
Diff
From 1620619c5fa6acae1e119d6461b5c9a2a9416e69 Mon Sep 17 00:00:00 2001
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From: gellert <gellert@raspberrypi.org>
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Date: Fri, 15 Aug 2014 16:35:06 +0100
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Subject: [PATCH] MMC: added alternative MMC driver
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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mmc: Disable CMD23 transfers on all cards
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Pending wire-level investigation of these types of transfers
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and associated errors on bcm2835-mmc, disable for now. Fallback of
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CMD18/CMD25 transfers will be used automatically by the MMC layer.
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Reported/Tested-by: Gellert Weisz <gellert@raspberrypi.org>
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mmc: bcm2835-mmc: enable DT support for all architectures
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Both ARCH_BCM2835 and ARCH_BCM270x are built with OF now.
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Enable Device Tree support for all architectures.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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mmc: bcm2835-mmc: fix probe error handling
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Probe error handling is broken in several places.
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Simplify error handling by using device managed functions.
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Replace pr_{err,info} with dev_{err,info}.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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bcm2835-mmc: Add locks when accessing sdhost registers
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bcm2835-mmc: Add range of debug options for slowing things down
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bcm2835-mmc: Add option to disable some delays
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bcm2835-mmc: Add option to disable MMC_QUIRK_BLK_NO_CMD23
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bcm2835-mmc: Default to disabling MMC_QUIRK_BLK_NO_CMD23
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bcm2835-mmc: Adding overclocking option
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Allow a different clock speed to be substitued for a requested 50MHz.
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This option is exposed using the "overclock_50" DT parameter.
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Note that the mmc interface is restricted to EVEN integer divisions of
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250MHz, and the highest sensible option is 63 (250/4 = 62.5), the
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next being 125 (250/2) which is much too high.
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Use at your own risk.
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bcm2835-mmc: Round up the overclock, so 62 works for 62.5Mhz
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Also only warn once for each overclock setting.
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mmc: bcm2835-mmc: Make available on ARCH_BCM2835
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Make the bcm2835-mmc driver available for use on ARCH_BCM2835.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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BCM270x_DT: add bcm2835-mmc entry
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Add Device Tree entry for bcm2835-mmc.
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In non-DT mode, don't add the device in the board file.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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bcm2835-mmc: Don't overwrite MMC capabilities from DT
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bcm2835-mmc: Don't override bus width capabilities from devicetree
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Take out the force setting of the MMC_CAP_4_BIT_DATA host capability
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so that the result read from devicetree via mmc_of_parse() is
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preserved.
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bcm2835-mmc: Only claim one DMA channel
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With both MMC controllers enabled there are few DMA channels left. The
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bcm2835-mmc driver only uses DMA in one direction at a time, so it
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doesn't need to claim two channels.
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See: https://github.com/raspberrypi/linux/issues/1327
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/mmc/core/quirks.c | 10 +
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drivers/mmc/host/Kconfig | 29 +
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drivers/mmc/host/Makefile | 1 +
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drivers/mmc/host/bcm2835-mmc.c | 1574 ++++++++++++++++++++++++++++++++++++++++
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4 files changed, 1614 insertions(+)
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create mode 100644 drivers/mmc/host/bcm2835-mmc.c
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--- a/drivers/mmc/core/quirks.c
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+++ b/drivers/mmc/core/quirks.c
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@@ -53,6 +53,9 @@ static const struct mmc_fixup mmc_fixup_
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void mmc_fixup_device(struct mmc_card *card, const struct mmc_fixup *table)
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{
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+#ifdef CONFIG_MMC_BCM2835
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+ extern unsigned mmc_debug;
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+#endif
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const struct mmc_fixup *f;
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u64 rev = cid_rev_card(card);
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@@ -79,5 +82,12 @@ void mmc_fixup_device(struct mmc_card *c
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f->vendor_fixup(card, f->data);
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}
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}
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+ /* SDHCI on BCM2708 - bug causes a certain sequence of CMD23 operations to fail.
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+ * Disable this flag for all cards (fall-back to CMD25/CMD18 multi-block transfers).
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+ */
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+#ifdef CONFIG_MMC_BCM2835
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+ if (mmc_debug & (1<<13))
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+ card->quirks |= MMC_QUIRK_BLK_NO_CMD23;
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+#endif
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}
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EXPORT_SYMBOL(mmc_fixup_device);
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--- a/drivers/mmc/host/Kconfig
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+++ b/drivers/mmc/host/Kconfig
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@@ -4,6 +4,35 @@
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comment "MMC/SD/SDIO Host Controller Drivers"
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+config MMC_BCM2835
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+ tristate "MMC support on BCM2835"
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+ depends on MACH_BCM2708 || MACH_BCM2709 || ARCH_BCM2835
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+ help
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+ This selects the MMC Interface on BCM2835.
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+
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+ If you have a controller with this interface, say Y or M here.
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+
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+ If unsure, say N.
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+
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+config MMC_BCM2835_DMA
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+ bool "DMA support on BCM2835 Arasan controller"
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+ depends on MMC_BCM2835
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+ help
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+ Enable DMA support on the Arasan SDHCI controller in Broadcom 2708
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+ based chips.
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+
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+ If unsure, say N.
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+
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+config MMC_BCM2835_PIO_DMA_BARRIER
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+ int "Block count limit for PIO transfers"
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+ depends on MMC_BCM2835 && MMC_BCM2835_DMA
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+ range 0 256
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+ default 2
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+ help
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+ The inclusive limit in bytes under which PIO will be used instead of DMA
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+
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+ If unsure, say 2 here.
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+
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config MMC_ARMMMCI
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tristate "ARM AMBA Multimedia Card Interface support"
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depends on ARM_AMBA
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--- a/drivers/mmc/host/Makefile
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+++ b/drivers/mmc/host/Makefile
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@@ -18,6 +18,7 @@ obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c
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obj-$(CONFIG_MMC_SDHCI_SIRF) += sdhci-sirf.o
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obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
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obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
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+obj-$(CONFIG_MMC_BCM2835) += bcm2835-mmc.o
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obj-$(CONFIG_MMC_WBSD) += wbsd.o
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obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
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obj-$(CONFIG_MMC_MTK) += mtk-sd.o
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--- /dev/null
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+++ b/drivers/mmc/host/bcm2835-mmc.c
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@@ -0,0 +1,1574 @@
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+/*
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+ * BCM2835 MMC host driver.
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+ *
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+ * Author: Gellert Weisz <gellert@raspberrypi.org>
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+ * Copyright 2014
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+ *
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+ * Based on
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+ * sdhci-bcm2708.c by Broadcom
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+ * sdhci-bcm2835.c by Stephen Warren and Oleksandr Tymoshenko
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+ * sdhci.c and sdhci-pci.c by Pierre Ossman
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/module.h>
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+#include <linux/io.h>
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+#include <linux/mmc/mmc.h>
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+#include <linux/mmc/host.h>
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+#include <linux/mmc/sd.h>
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+#include <linux/scatterlist.h>
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+#include <linux/of_address.h>
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+#include <linux/of_irq.h>
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+#include <linux/clk.h>
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+#include <linux/platform_device.h>
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+#include <linux/err.h>
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+#include <linux/blkdev.h>
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+#include <linux/dmaengine.h>
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+#include <linux/dma-mapping.h>
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+#include <linux/of_dma.h>
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+
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+#include "sdhci.h"
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+
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+
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+#define DRIVER_NAME "mmc-bcm2835"
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+
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+#define DBG(f, x...) \
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+pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x)
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+
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+#ifndef CONFIG_MMC_BCM2835_DMA
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+ #define FORCE_PIO
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+#endif
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+
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+
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+/* the inclusive limit in bytes under which PIO will be used instead of DMA */
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+#ifdef CONFIG_MMC_BCM2835_PIO_DMA_BARRIER
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+#define PIO_DMA_BARRIER CONFIG_MMC_BCM2835_PIO_DMA_BARRIER
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+#else
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+#define PIO_DMA_BARRIER 00
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+#endif
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+
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+#define MIN_FREQ 400000
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+#define TIMEOUT_VAL 0xE
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+#define BCM2835_SDHCI_WRITE_DELAY(f) (((2 * 1000000) / f) + 1)
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+
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+
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+unsigned mmc_debug;
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+unsigned mmc_debug2;
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+
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+struct bcm2835_host {
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+ spinlock_t lock;
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+
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+ void __iomem *ioaddr;
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+ u32 bus_addr;
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+
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+ struct mmc_host *mmc;
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+
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+ u32 timeout;
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+
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+ int clock; /* Current clock speed */
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+ u8 pwr; /* Current voltage */
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+
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+ unsigned int max_clk; /* Max possible freq */
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+ unsigned int timeout_clk; /* Timeout freq (KHz) */
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+ unsigned int clk_mul; /* Clock Muliplier value */
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+
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+ struct tasklet_struct finish_tasklet; /* Tasklet structures */
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+
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+ struct timer_list timer; /* Timer for timeouts */
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+
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+ struct sg_mapping_iter sg_miter; /* SG state for PIO */
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+ unsigned int blocks; /* remaining PIO blocks */
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+
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+ int irq; /* Device IRQ */
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+
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+
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+ u32 ier; /* cached registers */
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+
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+ struct mmc_request *mrq; /* Current request */
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+ struct mmc_command *cmd; /* Current command */
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+ struct mmc_data *data; /* Current data request */
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+ unsigned int data_early:1; /* Data finished before cmd */
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+
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+ wait_queue_head_t buf_ready_int; /* Waitqueue for Buffer Read Ready interrupt */
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+
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+ u32 thread_isr;
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+
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+ u32 shadow;
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+
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+ /*DMA part*/
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+ struct dma_chan *dma_chan_rxtx; /* DMA channel for reads and writes */
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+ struct dma_slave_config dma_cfg_rx;
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+ struct dma_slave_config dma_cfg_tx;
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+ struct dma_async_tx_descriptor *tx_desc; /* descriptor */
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+
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+ bool have_dma;
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+ bool use_dma;
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+ /*end of DMA part*/
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+
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+ int max_delay; /* maximum length of time spent waiting */
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+
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+ int flags; /* Host attributes */
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+#define SDHCI_REQ_USE_DMA (1<<2) /* Use DMA for this req. */
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+#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */
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+#define SDHCI_AUTO_CMD12 (1<<6) /* Auto CMD12 support */
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+#define SDHCI_AUTO_CMD23 (1<<7) /* Auto CMD23 support */
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+#define SDHCI_SDIO_IRQ_ENABLED (1<<9) /* SDIO irq enabled */
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+
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+ u32 overclock_50; /* frequency to use when 50MHz is requested (in MHz) */
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+ u32 max_overclock; /* Highest reported */
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+};
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+
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+
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+static inline void bcm2835_mmc_writel(struct bcm2835_host *host, u32 val, int reg, int from)
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+{
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+ unsigned delay;
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+ lockdep_assert_held_once(&host->lock);
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+ writel(val, host->ioaddr + reg);
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+ udelay(BCM2835_SDHCI_WRITE_DELAY(max(host->clock, MIN_FREQ)));
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+
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+ delay = ((mmc_debug >> 16) & 0xf) << ((mmc_debug >> 20) & 0xf);
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+ if (delay && !((1<<from) & mmc_debug2))
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+ udelay(delay);
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+}
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+
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+static inline void mmc_raw_writel(struct bcm2835_host *host, u32 val, int reg)
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+{
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+ unsigned delay;
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+ lockdep_assert_held_once(&host->lock);
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+ writel(val, host->ioaddr + reg);
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+
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+ delay = ((mmc_debug >> 24) & 0xf) << ((mmc_debug >> 28) & 0xf);
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+ if (delay)
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+ udelay(delay);
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+}
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+
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+static inline u32 bcm2835_mmc_readl(struct bcm2835_host *host, int reg)
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+{
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+ lockdep_assert_held_once(&host->lock);
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+ return readl(host->ioaddr + reg);
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+}
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+
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+static inline void bcm2835_mmc_writew(struct bcm2835_host *host, u16 val, int reg)
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+{
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+ u32 oldval = (reg == SDHCI_COMMAND) ? host->shadow :
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+ bcm2835_mmc_readl(host, reg & ~3);
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+ u32 word_num = (reg >> 1) & 1;
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+ u32 word_shift = word_num * 16;
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+ u32 mask = 0xffff << word_shift;
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+ u32 newval = (oldval & ~mask) | (val << word_shift);
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+
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+ if (reg == SDHCI_TRANSFER_MODE)
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+ host->shadow = newval;
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+ else
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+ bcm2835_mmc_writel(host, newval, reg & ~3, 0);
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+
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+}
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+
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+static inline void bcm2835_mmc_writeb(struct bcm2835_host *host, u8 val, int reg)
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+{
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+ u32 oldval = bcm2835_mmc_readl(host, reg & ~3);
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+ u32 byte_num = reg & 3;
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+ u32 byte_shift = byte_num * 8;
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+ u32 mask = 0xff << byte_shift;
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+ u32 newval = (oldval & ~mask) | (val << byte_shift);
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+
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+ bcm2835_mmc_writel(host, newval, reg & ~3, 1);
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+}
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+
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+
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+static inline u16 bcm2835_mmc_readw(struct bcm2835_host *host, int reg)
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+{
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+ u32 val = bcm2835_mmc_readl(host, (reg & ~3));
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+ u32 word_num = (reg >> 1) & 1;
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+ u32 word_shift = word_num * 16;
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+ u32 word = (val >> word_shift) & 0xffff;
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+
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+ return word;
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+}
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+
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+static inline u8 bcm2835_mmc_readb(struct bcm2835_host *host, int reg)
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+{
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+ u32 val = bcm2835_mmc_readl(host, (reg & ~3));
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+ u32 byte_num = reg & 3;
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+ u32 byte_shift = byte_num * 8;
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+ u32 byte = (val >> byte_shift) & 0xff;
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+
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+ return byte;
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+}
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+
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+static void bcm2835_mmc_unsignal_irqs(struct bcm2835_host *host, u32 clear)
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+{
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+ u32 ier;
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+
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+ ier = bcm2835_mmc_readl(host, SDHCI_SIGNAL_ENABLE);
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+ ier &= ~clear;
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+ /* change which requests generate IRQs - makes no difference to
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+ the content of SDHCI_INT_STATUS, or the need to acknowledge IRQs */
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+ bcm2835_mmc_writel(host, ier, SDHCI_SIGNAL_ENABLE, 2);
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+}
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+
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+
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+static void bcm2835_mmc_dumpregs(struct bcm2835_host *host)
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+{
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+ pr_debug(DRIVER_NAME ": =========== REGISTER DUMP (%s)===========\n",
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+ mmc_hostname(host->mmc));
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+
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+ pr_debug(DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
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+ bcm2835_mmc_readl(host, SDHCI_DMA_ADDRESS),
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+ bcm2835_mmc_readw(host, SDHCI_HOST_VERSION));
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+ pr_debug(DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
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+ bcm2835_mmc_readw(host, SDHCI_BLOCK_SIZE),
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+ bcm2835_mmc_readw(host, SDHCI_BLOCK_COUNT));
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+ pr_debug(DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
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+ bcm2835_mmc_readl(host, SDHCI_ARGUMENT),
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+ bcm2835_mmc_readw(host, SDHCI_TRANSFER_MODE));
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+ pr_debug(DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
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+ bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE),
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+ bcm2835_mmc_readb(host, SDHCI_HOST_CONTROL));
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+ pr_debug(DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
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+ bcm2835_mmc_readb(host, SDHCI_POWER_CONTROL),
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+ bcm2835_mmc_readb(host, SDHCI_BLOCK_GAP_CONTROL));
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+ pr_debug(DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
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+ bcm2835_mmc_readb(host, SDHCI_WAKE_UP_CONTROL),
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+ bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL));
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+ pr_debug(DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
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+ bcm2835_mmc_readb(host, SDHCI_TIMEOUT_CONTROL),
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+ bcm2835_mmc_readl(host, SDHCI_INT_STATUS));
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+ pr_debug(DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
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+ bcm2835_mmc_readl(host, SDHCI_INT_ENABLE),
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+ bcm2835_mmc_readl(host, SDHCI_SIGNAL_ENABLE));
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+ pr_debug(DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
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+ bcm2835_mmc_readw(host, SDHCI_ACMD12_ERR),
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+ bcm2835_mmc_readw(host, SDHCI_SLOT_INT_STATUS));
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+ pr_debug(DRIVER_NAME ": Caps: 0x%08x | Caps_1: 0x%08x\n",
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+ bcm2835_mmc_readl(host, SDHCI_CAPABILITIES),
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+ bcm2835_mmc_readl(host, SDHCI_CAPABILITIES_1));
|
|
+ pr_debug(DRIVER_NAME ": Cmd: 0x%08x | Max curr: 0x%08x\n",
|
|
+ bcm2835_mmc_readw(host, SDHCI_COMMAND),
|
|
+ bcm2835_mmc_readl(host, SDHCI_MAX_CURRENT));
|
|
+ pr_debug(DRIVER_NAME ": Host ctl2: 0x%08x\n",
|
|
+ bcm2835_mmc_readw(host, SDHCI_HOST_CONTROL2));
|
|
+
|
|
+ pr_debug(DRIVER_NAME ": ===========================================\n");
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_reset(struct bcm2835_host *host, u8 mask)
|
|
+{
|
|
+ unsigned long timeout;
|
|
+ unsigned long flags;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ bcm2835_mmc_writeb(host, mask, SDHCI_SOFTWARE_RESET);
|
|
+
|
|
+ if (mask & SDHCI_RESET_ALL)
|
|
+ host->clock = 0;
|
|
+
|
|
+ /* Wait max 100 ms */
|
|
+ timeout = 100;
|
|
+
|
|
+ /* hw clears the bit when it's done */
|
|
+ while (bcm2835_mmc_readb(host, SDHCI_SOFTWARE_RESET) & mask) {
|
|
+ if (timeout == 0) {
|
|
+ pr_err("%s: Reset 0x%x never completed.\n",
|
|
+ mmc_hostname(host->mmc), (int)mask);
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+ return;
|
|
+ }
|
|
+ timeout--;
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ mdelay(1);
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ }
|
|
+
|
|
+ if (100-timeout > 10 && 100-timeout > host->max_delay) {
|
|
+ host->max_delay = 100-timeout;
|
|
+ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay);
|
|
+ }
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
|
|
+
|
|
+static void bcm2835_mmc_init(struct bcm2835_host *host, int soft)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ if (soft)
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
|
|
+ else
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_ALL);
|
|
+
|
|
+ host->ier = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
|
|
+ SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT |
|
|
+ SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC |
|
|
+ SDHCI_INT_TIMEOUT | SDHCI_INT_DATA_END |
|
|
+ SDHCI_INT_RESPONSE;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE, 3);
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE, 3);
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+
|
|
+ if (soft) {
|
|
+ /* force clock reconfiguration */
|
|
+ host->clock = 0;
|
|
+ bcm2835_mmc_set_ios(host->mmc, &host->mmc->ios);
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_finish_data(struct bcm2835_host *host);
|
|
+
|
|
+static void bcm2835_mmc_dma_complete(void *param)
|
|
+{
|
|
+ struct bcm2835_host *host = param;
|
|
+ struct dma_chan *dma_chan;
|
|
+ unsigned long flags;
|
|
+ u32 dir_data;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ if (host->data && !(host->data->flags & MMC_DATA_WRITE)) {
|
|
+ /* otherwise handled in SDHCI IRQ */
|
|
+ dma_chan = host->dma_chan_rxtx;
|
|
+ dir_data = DMA_FROM_DEVICE;
|
|
+
|
|
+ dma_unmap_sg(dma_chan->device->dev,
|
|
+ host->data->sg, host->data->sg_len,
|
|
+ dir_data);
|
|
+
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+ }
|
|
+
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+}
|
|
+
|
|
+static void bcm2835_bcm2835_mmc_read_block_pio(struct bcm2835_host *host)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ size_t blksize, len, chunk;
|
|
+
|
|
+ u32 uninitialized_var(scratch);
|
|
+ u8 *buf;
|
|
+
|
|
+ blksize = host->data->blksz;
|
|
+ chunk = 0;
|
|
+
|
|
+ local_irq_save(flags);
|
|
+
|
|
+ while (blksize) {
|
|
+ if (!sg_miter_next(&host->sg_miter))
|
|
+ BUG();
|
|
+
|
|
+ len = min(host->sg_miter.length, blksize);
|
|
+
|
|
+ blksize -= len;
|
|
+ host->sg_miter.consumed = len;
|
|
+
|
|
+ buf = host->sg_miter.addr;
|
|
+
|
|
+ while (len) {
|
|
+ if (chunk == 0) {
|
|
+ scratch = bcm2835_mmc_readl(host, SDHCI_BUFFER);
|
|
+ chunk = 4;
|
|
+ }
|
|
+
|
|
+ *buf = scratch & 0xFF;
|
|
+
|
|
+ buf++;
|
|
+ scratch >>= 8;
|
|
+ chunk--;
|
|
+ len--;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ sg_miter_stop(&host->sg_miter);
|
|
+
|
|
+ local_irq_restore(flags);
|
|
+}
|
|
+
|
|
+static void bcm2835_bcm2835_mmc_write_block_pio(struct bcm2835_host *host)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ size_t blksize, len, chunk;
|
|
+ u32 scratch;
|
|
+ u8 *buf;
|
|
+
|
|
+ blksize = host->data->blksz;
|
|
+ chunk = 0;
|
|
+ chunk = 0;
|
|
+ scratch = 0;
|
|
+
|
|
+ local_irq_save(flags);
|
|
+
|
|
+ while (blksize) {
|
|
+ if (!sg_miter_next(&host->sg_miter))
|
|
+ BUG();
|
|
+
|
|
+ len = min(host->sg_miter.length, blksize);
|
|
+
|
|
+ blksize -= len;
|
|
+ host->sg_miter.consumed = len;
|
|
+
|
|
+ buf = host->sg_miter.addr;
|
|
+
|
|
+ while (len) {
|
|
+ scratch |= (u32)*buf << (chunk * 8);
|
|
+
|
|
+ buf++;
|
|
+ chunk++;
|
|
+ len--;
|
|
+
|
|
+ if ((chunk == 4) || ((len == 0) && (blksize == 0))) {
|
|
+ mmc_raw_writel(host, scratch, SDHCI_BUFFER);
|
|
+ chunk = 0;
|
|
+ scratch = 0;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+
|
|
+ sg_miter_stop(&host->sg_miter);
|
|
+
|
|
+ local_irq_restore(flags);
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_transfer_pio(struct bcm2835_host *host)
|
|
+{
|
|
+ u32 mask;
|
|
+
|
|
+ BUG_ON(!host->data);
|
|
+
|
|
+ if (host->blocks == 0)
|
|
+ return;
|
|
+
|
|
+ if (host->data->flags & MMC_DATA_READ)
|
|
+ mask = SDHCI_DATA_AVAILABLE;
|
|
+ else
|
|
+ mask = SDHCI_SPACE_AVAILABLE;
|
|
+
|
|
+ while (bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE) & mask) {
|
|
+
|
|
+ if (host->data->flags & MMC_DATA_READ)
|
|
+ bcm2835_bcm2835_mmc_read_block_pio(host);
|
|
+ else
|
|
+ bcm2835_bcm2835_mmc_write_block_pio(host);
|
|
+
|
|
+ host->blocks--;
|
|
+
|
|
+ /* QUIRK used in sdhci.c removes the 'if' */
|
|
+ /* but it seems this is unnecessary */
|
|
+ if (host->blocks == 0)
|
|
+ break;
|
|
+
|
|
+
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_transfer_dma(struct bcm2835_host *host)
|
|
+{
|
|
+ u32 len, dir_data, dir_slave;
|
|
+ struct dma_async_tx_descriptor *desc = NULL;
|
|
+ struct dma_chan *dma_chan;
|
|
+
|
|
+
|
|
+ WARN_ON(!host->data);
|
|
+
|
|
+ if (!host->data)
|
|
+ return;
|
|
+
|
|
+ if (host->blocks == 0)
|
|
+ return;
|
|
+
|
|
+ dma_chan = host->dma_chan_rxtx;
|
|
+ if (host->data->flags & MMC_DATA_READ) {
|
|
+ dir_data = DMA_FROM_DEVICE;
|
|
+ dir_slave = DMA_DEV_TO_MEM;
|
|
+ } else {
|
|
+ dir_data = DMA_TO_DEVICE;
|
|
+ dir_slave = DMA_MEM_TO_DEV;
|
|
+ }
|
|
+
|
|
+ /* The parameters have already been validated, so this will not fail */
|
|
+ (void)dmaengine_slave_config(dma_chan,
|
|
+ (dir_data == DMA_FROM_DEVICE) ?
|
|
+ &host->dma_cfg_rx :
|
|
+ &host->dma_cfg_tx);
|
|
+
|
|
+ BUG_ON(!dma_chan->device);
|
|
+ BUG_ON(!dma_chan->device->dev);
|
|
+ BUG_ON(!host->data->sg);
|
|
+
|
|
+ len = dma_map_sg(dma_chan->device->dev, host->data->sg,
|
|
+ host->data->sg_len, dir_data);
|
|
+ if (len > 0) {
|
|
+ desc = dmaengine_prep_slave_sg(dma_chan, host->data->sg,
|
|
+ len, dir_slave,
|
|
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
+ } else {
|
|
+ dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n");
|
|
+ }
|
|
+ if (desc) {
|
|
+ unsigned long flags;
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ bcm2835_mmc_unsignal_irqs(host, SDHCI_INT_DATA_AVAIL |
|
|
+ SDHCI_INT_SPACE_AVAIL);
|
|
+ host->tx_desc = desc;
|
|
+ desc->callback = bcm2835_mmc_dma_complete;
|
|
+ desc->callback_param = host;
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ dmaengine_submit(desc);
|
|
+ dma_async_issue_pending(dma_chan);
|
|
+ }
|
|
+
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_set_transfer_irqs(struct bcm2835_host *host)
|
|
+{
|
|
+ u32 pio_irqs = SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL;
|
|
+ u32 dma_irqs = SDHCI_INT_DMA_END | SDHCI_INT_ADMA_ERROR;
|
|
+
|
|
+ if (host->use_dma)
|
|
+ host->ier = (host->ier & ~pio_irqs) | dma_irqs;
|
|
+ else
|
|
+ host->ier = (host->ier & ~dma_irqs) | pio_irqs;
|
|
+
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE, 4);
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE, 4);
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_prepare_data(struct bcm2835_host *host, struct mmc_command *cmd)
|
|
+{
|
|
+ u8 count;
|
|
+ struct mmc_data *data = cmd->data;
|
|
+
|
|
+ WARN_ON(host->data);
|
|
+
|
|
+ if (data || (cmd->flags & MMC_RSP_BUSY)) {
|
|
+ count = TIMEOUT_VAL;
|
|
+ bcm2835_mmc_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
|
|
+ }
|
|
+
|
|
+ if (!data)
|
|
+ return;
|
|
+
|
|
+ /* Sanity checks */
|
|
+ BUG_ON(data->blksz * data->blocks > 524288);
|
|
+ BUG_ON(data->blksz > host->mmc->max_blk_size);
|
|
+ BUG_ON(data->blocks > 65535);
|
|
+
|
|
+ host->data = data;
|
|
+ host->data_early = 0;
|
|
+ host->data->bytes_xfered = 0;
|
|
+
|
|
+
|
|
+ if (!(host->flags & SDHCI_REQ_USE_DMA)) {
|
|
+ int flags;
|
|
+
|
|
+ flags = SG_MITER_ATOMIC;
|
|
+ if (host->data->flags & MMC_DATA_READ)
|
|
+ flags |= SG_MITER_TO_SG;
|
|
+ else
|
|
+ flags |= SG_MITER_FROM_SG;
|
|
+ sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
|
|
+ host->blocks = data->blocks;
|
|
+ }
|
|
+
|
|
+ host->use_dma = host->have_dma && data->blocks > PIO_DMA_BARRIER;
|
|
+
|
|
+ bcm2835_mmc_set_transfer_irqs(host);
|
|
+
|
|
+ /* Set the DMA boundary value and block size */
|
|
+ bcm2835_mmc_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
|
|
+ data->blksz), SDHCI_BLOCK_SIZE);
|
|
+ bcm2835_mmc_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
|
|
+
|
|
+ BUG_ON(!host->data);
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_set_transfer_mode(struct bcm2835_host *host,
|
|
+ struct mmc_command *cmd)
|
|
+{
|
|
+ u16 mode;
|
|
+ struct mmc_data *data = cmd->data;
|
|
+
|
|
+ if (data == NULL) {
|
|
+ /* clear Auto CMD settings for no data CMDs */
|
|
+ mode = bcm2835_mmc_readw(host, SDHCI_TRANSFER_MODE);
|
|
+ bcm2835_mmc_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
|
|
+ SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ WARN_ON(!host->data);
|
|
+
|
|
+ mode = SDHCI_TRNS_BLK_CNT_EN;
|
|
+
|
|
+ if ((mmc_op_multi(cmd->opcode) || data->blocks > 1)) {
|
|
+ mode |= SDHCI_TRNS_MULTI;
|
|
+
|
|
+ /*
|
|
+ * If we are sending CMD23, CMD12 never gets sent
|
|
+ * on successful completion (so no Auto-CMD12).
|
|
+ */
|
|
+ if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
|
|
+ mode |= SDHCI_TRNS_AUTO_CMD12;
|
|
+ else if (host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
|
|
+ mode |= SDHCI_TRNS_AUTO_CMD23;
|
|
+ bcm2835_mmc_writel(host, host->mrq->sbc->arg, SDHCI_ARGUMENT2, 5);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (data->flags & MMC_DATA_READ)
|
|
+ mode |= SDHCI_TRNS_READ;
|
|
+ if (host->flags & SDHCI_REQ_USE_DMA)
|
|
+ mode |= SDHCI_TRNS_DMA;
|
|
+
|
|
+ bcm2835_mmc_writew(host, mode, SDHCI_TRANSFER_MODE);
|
|
+}
|
|
+
|
|
+void bcm2835_mmc_send_command(struct bcm2835_host *host, struct mmc_command *cmd)
|
|
+{
|
|
+ int flags;
|
|
+ u32 mask;
|
|
+ unsigned long timeout;
|
|
+
|
|
+ WARN_ON(host->cmd);
|
|
+
|
|
+ /* Wait max 10 ms */
|
|
+ timeout = 1000;
|
|
+
|
|
+ mask = SDHCI_CMD_INHIBIT;
|
|
+ if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
|
|
+ mask |= SDHCI_DATA_INHIBIT;
|
|
+
|
|
+ /* We shouldn't wait for data inihibit for stop commands, even
|
|
+ though they might use busy signaling */
|
|
+ if (host->mrq->data && (cmd == host->mrq->data->stop))
|
|
+ mask &= ~SDHCI_DATA_INHIBIT;
|
|
+
|
|
+ while (bcm2835_mmc_readl(host, SDHCI_PRESENT_STATE) & mask) {
|
|
+ if (timeout == 0) {
|
|
+ pr_err("%s: Controller never released inhibit bit(s).\n",
|
|
+ mmc_hostname(host->mmc));
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+ cmd->error = -EIO;
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+ return;
|
|
+ }
|
|
+ timeout--;
|
|
+ udelay(10);
|
|
+ }
|
|
+
|
|
+ if ((1000-timeout)/100 > 1 && (1000-timeout)/100 > host->max_delay) {
|
|
+ host->max_delay = (1000-timeout)/100;
|
|
+ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay);
|
|
+ }
|
|
+
|
|
+ timeout = jiffies;
|
|
+ if (!cmd->data && cmd->busy_timeout > 9000)
|
|
+ timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
|
|
+ else
|
|
+ timeout += 10 * HZ;
|
|
+ mod_timer(&host->timer, timeout);
|
|
+
|
|
+ host->cmd = cmd;
|
|
+
|
|
+ bcm2835_mmc_prepare_data(host, cmd);
|
|
+
|
|
+ bcm2835_mmc_writel(host, cmd->arg, SDHCI_ARGUMENT, 6);
|
|
+
|
|
+ bcm2835_mmc_set_transfer_mode(host, cmd);
|
|
+
|
|
+ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
|
|
+ pr_err("%s: Unsupported response type!\n",
|
|
+ mmc_hostname(host->mmc));
|
|
+ cmd->error = -EINVAL;
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (!(cmd->flags & MMC_RSP_PRESENT))
|
|
+ flags = SDHCI_CMD_RESP_NONE;
|
|
+ else if (cmd->flags & MMC_RSP_136)
|
|
+ flags = SDHCI_CMD_RESP_LONG;
|
|
+ else if (cmd->flags & MMC_RSP_BUSY)
|
|
+ flags = SDHCI_CMD_RESP_SHORT_BUSY;
|
|
+ else
|
|
+ flags = SDHCI_CMD_RESP_SHORT;
|
|
+
|
|
+ if (cmd->flags & MMC_RSP_CRC)
|
|
+ flags |= SDHCI_CMD_CRC;
|
|
+ if (cmd->flags & MMC_RSP_OPCODE)
|
|
+ flags |= SDHCI_CMD_INDEX;
|
|
+
|
|
+ if (cmd->data)
|
|
+ flags |= SDHCI_CMD_DATA;
|
|
+
|
|
+ bcm2835_mmc_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_finish_data(struct bcm2835_host *host)
|
|
+{
|
|
+ struct mmc_data *data;
|
|
+
|
|
+ BUG_ON(!host->data);
|
|
+
|
|
+ data = host->data;
|
|
+ host->data = NULL;
|
|
+
|
|
+ if (data->error)
|
|
+ data->bytes_xfered = 0;
|
|
+ else
|
|
+ data->bytes_xfered = data->blksz * data->blocks;
|
|
+
|
|
+ /*
|
|
+ * Need to send CMD12 if -
|
|
+ * a) open-ended multiblock transfer (no CMD23)
|
|
+ * b) error in multiblock transfer
|
|
+ */
|
|
+ if (data->stop &&
|
|
+ (data->error ||
|
|
+ !host->mrq->sbc)) {
|
|
+
|
|
+ /*
|
|
+ * The controller needs a reset of internal state machines
|
|
+ * upon error conditions.
|
|
+ */
|
|
+ if (data->error) {
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_CMD);
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_DATA);
|
|
+ }
|
|
+
|
|
+ bcm2835_mmc_send_command(host, data->stop);
|
|
+ } else
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_finish_command(struct bcm2835_host *host)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ BUG_ON(host->cmd == NULL);
|
|
+
|
|
+ if (host->cmd->flags & MMC_RSP_PRESENT) {
|
|
+ if (host->cmd->flags & MMC_RSP_136) {
|
|
+ /* CRC is stripped so we need to do some shifting. */
|
|
+ for (i = 0; i < 4; i++) {
|
|
+ host->cmd->resp[i] = bcm2835_mmc_readl(host,
|
|
+ SDHCI_RESPONSE + (3-i)*4) << 8;
|
|
+ if (i != 3)
|
|
+ host->cmd->resp[i] |=
|
|
+ bcm2835_mmc_readb(host,
|
|
+ SDHCI_RESPONSE + (3-i)*4-1);
|
|
+ }
|
|
+ } else {
|
|
+ host->cmd->resp[0] = bcm2835_mmc_readl(host, SDHCI_RESPONSE);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ host->cmd->error = 0;
|
|
+
|
|
+ /* Finished CMD23, now send actual command. */
|
|
+ if (host->cmd == host->mrq->sbc) {
|
|
+ host->cmd = NULL;
|
|
+ bcm2835_mmc_send_command(host, host->mrq->cmd);
|
|
+
|
|
+ if (host->mrq->cmd->data && host->use_dma) {
|
|
+ /* DMA transfer starts now, PIO starts after interrupt */
|
|
+ bcm2835_mmc_transfer_dma(host);
|
|
+ }
|
|
+ } else {
|
|
+
|
|
+ /* Processed actual command. */
|
|
+ if (host->data && host->data_early)
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+
|
|
+ if (!host->cmd->data)
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+
|
|
+ host->cmd = NULL;
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_timeout_timer(unsigned long data)
|
|
+{
|
|
+ struct bcm2835_host *host;
|
|
+ unsigned long flags;
|
|
+
|
|
+ host = (struct bcm2835_host *)data;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ if (host->mrq) {
|
|
+ pr_err("%s: Timeout waiting for hardware interrupt.\n",
|
|
+ mmc_hostname(host->mmc));
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+
|
|
+ if (host->data) {
|
|
+ host->data->error = -ETIMEDOUT;
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+ } else {
|
|
+ if (host->cmd)
|
|
+ host->cmd->error = -ETIMEDOUT;
|
|
+ else
|
|
+ host->mrq->cmd->error = -ETIMEDOUT;
|
|
+
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ mmiowb();
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_enable_sdio_irq_nolock(struct bcm2835_host *host, int enable)
|
|
+{
|
|
+ if (!(host->flags & SDHCI_DEVICE_DEAD)) {
|
|
+ if (enable)
|
|
+ host->ier |= SDHCI_INT_CARD_INT;
|
|
+ else
|
|
+ host->ier &= ~SDHCI_INT_CARD_INT;
|
|
+
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_INT_ENABLE, 7);
|
|
+ bcm2835_mmc_writel(host, host->ier, SDHCI_SIGNAL_ENABLE, 7);
|
|
+ mmiowb();
|
|
+ }
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
|
|
+{
|
|
+ struct bcm2835_host *host = mmc_priv(mmc);
|
|
+ unsigned long flags;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ if (enable)
|
|
+ host->flags |= SDHCI_SDIO_IRQ_ENABLED;
|
|
+ else
|
|
+ host->flags &= ~SDHCI_SDIO_IRQ_ENABLED;
|
|
+
|
|
+ bcm2835_mmc_enable_sdio_irq_nolock(host, enable);
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_cmd_irq(struct bcm2835_host *host, u32 intmask)
|
|
+{
|
|
+
|
|
+ BUG_ON(intmask == 0);
|
|
+
|
|
+ if (!host->cmd) {
|
|
+ pr_err("%s: Got command interrupt 0x%08x even "
|
|
+ "though no command operation was in progress.\n",
|
|
+ mmc_hostname(host->mmc), (unsigned)intmask);
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (intmask & SDHCI_INT_TIMEOUT)
|
|
+ host->cmd->error = -ETIMEDOUT;
|
|
+ else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
|
|
+ SDHCI_INT_INDEX)) {
|
|
+ host->cmd->error = -EILSEQ;
|
|
+ }
|
|
+
|
|
+ if (host->cmd->error) {
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (intmask & SDHCI_INT_RESPONSE)
|
|
+ bcm2835_mmc_finish_command(host);
|
|
+
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_data_irq(struct bcm2835_host *host, u32 intmask)
|
|
+{
|
|
+ struct dma_chan *dma_chan;
|
|
+ u32 dir_data;
|
|
+
|
|
+ BUG_ON(intmask == 0);
|
|
+
|
|
+ if (!host->data) {
|
|
+ /*
|
|
+ * The "data complete" interrupt is also used to
|
|
+ * indicate that a busy state has ended. See comment
|
|
+ * above in sdhci_cmd_irq().
|
|
+ */
|
|
+ if (host->cmd && (host->cmd->flags & MMC_RSP_BUSY)) {
|
|
+ if (intmask & SDHCI_INT_DATA_END) {
|
|
+ bcm2835_mmc_finish_command(host);
|
|
+ return;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ pr_debug("%s: Got data interrupt 0x%08x even "
|
|
+ "though no data operation was in progress.\n",
|
|
+ mmc_hostname(host->mmc), (unsigned)intmask);
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (intmask & SDHCI_INT_DATA_TIMEOUT)
|
|
+ host->data->error = -ETIMEDOUT;
|
|
+ else if (intmask & SDHCI_INT_DATA_END_BIT)
|
|
+ host->data->error = -EILSEQ;
|
|
+ else if ((intmask & SDHCI_INT_DATA_CRC) &&
|
|
+ SDHCI_GET_CMD(bcm2835_mmc_readw(host, SDHCI_COMMAND))
|
|
+ != MMC_BUS_TEST_R)
|
|
+ host->data->error = -EILSEQ;
|
|
+
|
|
+ if (host->use_dma) {
|
|
+ if (host->data->flags & MMC_DATA_WRITE) {
|
|
+ /* IRQ handled here */
|
|
+
|
|
+ dma_chan = host->dma_chan_rxtx;
|
|
+ dir_data = DMA_TO_DEVICE;
|
|
+ dma_unmap_sg(dma_chan->device->dev,
|
|
+ host->data->sg, host->data->sg_len,
|
|
+ dir_data);
|
|
+
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+ }
|
|
+
|
|
+ } else {
|
|
+ if (host->data->error)
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+ else {
|
|
+ if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
|
|
+ bcm2835_mmc_transfer_pio(host);
|
|
+
|
|
+ if (intmask & SDHCI_INT_DATA_END) {
|
|
+ if (host->cmd) {
|
|
+ /*
|
|
+ * Data managed to finish before the
|
|
+ * command completed. Make sure we do
|
|
+ * things in the proper order.
|
|
+ */
|
|
+ host->data_early = 1;
|
|
+ } else {
|
|
+ bcm2835_mmc_finish_data(host);
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+static irqreturn_t bcm2835_mmc_irq(int irq, void *dev_id)
|
|
+{
|
|
+ irqreturn_t result = IRQ_NONE;
|
|
+ struct bcm2835_host *host = dev_id;
|
|
+ u32 intmask, mask, unexpected = 0;
|
|
+ int max_loops = 16;
|
|
+
|
|
+ spin_lock(&host->lock);
|
|
+
|
|
+ intmask = bcm2835_mmc_readl(host, SDHCI_INT_STATUS);
|
|
+
|
|
+ if (!intmask || intmask == 0xffffffff) {
|
|
+ result = IRQ_NONE;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ do {
|
|
+ /* Clear selected interrupts. */
|
|
+ mask = intmask & (SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
|
|
+ SDHCI_INT_BUS_POWER);
|
|
+ bcm2835_mmc_writel(host, mask, SDHCI_INT_STATUS, 8);
|
|
+
|
|
+
|
|
+ if (intmask & SDHCI_INT_CMD_MASK)
|
|
+ bcm2835_mmc_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
|
|
+
|
|
+ if (intmask & SDHCI_INT_DATA_MASK)
|
|
+ bcm2835_mmc_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
|
|
+
|
|
+ if (intmask & SDHCI_INT_BUS_POWER)
|
|
+ pr_err("%s: Card is consuming too much power!\n",
|
|
+ mmc_hostname(host->mmc));
|
|
+
|
|
+ if (intmask & SDHCI_INT_CARD_INT) {
|
|
+ bcm2835_mmc_enable_sdio_irq_nolock(host, false);
|
|
+ host->thread_isr |= SDHCI_INT_CARD_INT;
|
|
+ result = IRQ_WAKE_THREAD;
|
|
+ }
|
|
+
|
|
+ intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE |
|
|
+ SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK |
|
|
+ SDHCI_INT_ERROR | SDHCI_INT_BUS_POWER |
|
|
+ SDHCI_INT_CARD_INT);
|
|
+
|
|
+ if (intmask) {
|
|
+ unexpected |= intmask;
|
|
+ bcm2835_mmc_writel(host, intmask, SDHCI_INT_STATUS, 9);
|
|
+ }
|
|
+
|
|
+ if (result == IRQ_NONE)
|
|
+ result = IRQ_HANDLED;
|
|
+
|
|
+ intmask = bcm2835_mmc_readl(host, SDHCI_INT_STATUS);
|
|
+ } while (intmask && --max_loops);
|
|
+out:
|
|
+ spin_unlock(&host->lock);
|
|
+
|
|
+ if (unexpected) {
|
|
+ pr_err("%s: Unexpected interrupt 0x%08x.\n",
|
|
+ mmc_hostname(host->mmc), unexpected);
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+ }
|
|
+
|
|
+ return result;
|
|
+}
|
|
+
|
|
+static irqreturn_t bcm2835_mmc_thread_irq(int irq, void *dev_id)
|
|
+{
|
|
+ struct bcm2835_host *host = dev_id;
|
|
+ unsigned long flags;
|
|
+ u32 isr;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ isr = host->thread_isr;
|
|
+ host->thread_isr = 0;
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+
|
|
+ if (isr & SDHCI_INT_CARD_INT) {
|
|
+ sdio_run_irqs(host->mmc);
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ if (host->flags & SDHCI_SDIO_IRQ_ENABLED)
|
|
+ bcm2835_mmc_enable_sdio_irq_nolock(host, true);
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ }
|
|
+
|
|
+ return isr ? IRQ_HANDLED : IRQ_NONE;
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
+void bcm2835_mmc_set_clock(struct bcm2835_host *host, unsigned int clock)
|
|
+{
|
|
+ int div = 0; /* Initialized for compiler warning */
|
|
+ int real_div = div, clk_mul = 1;
|
|
+ u16 clk = 0;
|
|
+ unsigned long timeout;
|
|
+ unsigned int input_clock = clock;
|
|
+
|
|
+ if (host->overclock_50 && (clock == 50000000))
|
|
+ clock = host->overclock_50 * 1000000 + 999999;
|
|
+
|
|
+ host->mmc->actual_clock = 0;
|
|
+
|
|
+ bcm2835_mmc_writew(host, 0, SDHCI_CLOCK_CONTROL);
|
|
+
|
|
+ if (clock == 0)
|
|
+ return;
|
|
+
|
|
+ /* Version 3.00 divisors must be a multiple of 2. */
|
|
+ if (host->max_clk <= clock)
|
|
+ div = 1;
|
|
+ else {
|
|
+ for (div = 2; div < SDHCI_MAX_DIV_SPEC_300;
|
|
+ div += 2) {
|
|
+ if ((host->max_clk / div) <= clock)
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ real_div = div;
|
|
+ div >>= 1;
|
|
+
|
|
+ if (real_div)
|
|
+ clock = (host->max_clk * clk_mul) / real_div;
|
|
+ host->mmc->actual_clock = clock;
|
|
+
|
|
+ if ((clock > input_clock) && (clock > host->max_overclock)) {
|
|
+ pr_warn("%s: Overclocking to %dHz\n",
|
|
+ mmc_hostname(host->mmc), clock);
|
|
+ host->max_overclock = clock;
|
|
+ }
|
|
+
|
|
+ clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT;
|
|
+ clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN)
|
|
+ << SDHCI_DIVIDER_HI_SHIFT;
|
|
+ clk |= SDHCI_CLOCK_INT_EN;
|
|
+ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL);
|
|
+
|
|
+ /* Wait max 20 ms */
|
|
+ timeout = 20;
|
|
+ while (!((clk = bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL))
|
|
+ & SDHCI_CLOCK_INT_STABLE)) {
|
|
+ if (timeout == 0) {
|
|
+ pr_err("%s: Internal clock never "
|
|
+ "stabilised.\n", mmc_hostname(host->mmc));
|
|
+ bcm2835_mmc_dumpregs(host);
|
|
+ return;
|
|
+ }
|
|
+ timeout--;
|
|
+ mdelay(1);
|
|
+ }
|
|
+
|
|
+ if (20-timeout > 10 && 20-timeout > host->max_delay) {
|
|
+ host->max_delay = 20-timeout;
|
|
+ pr_warning("Warning: MMC controller hung for %d ms\n", host->max_delay);
|
|
+ }
|
|
+
|
|
+ clk |= SDHCI_CLOCK_CARD_EN;
|
|
+ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL);
|
|
+}
|
|
+
|
|
+static void bcm2835_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
+{
|
|
+ struct bcm2835_host *host;
|
|
+ unsigned long flags;
|
|
+
|
|
+ host = mmc_priv(mmc);
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ WARN_ON(host->mrq != NULL);
|
|
+
|
|
+ host->mrq = mrq;
|
|
+
|
|
+ if (mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23))
|
|
+ bcm2835_mmc_send_command(host, mrq->sbc);
|
|
+ else
|
|
+ bcm2835_mmc_send_command(host, mrq->cmd);
|
|
+
|
|
+ mmiowb();
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+
|
|
+ if (!(mrq->sbc && !(host->flags & SDHCI_AUTO_CMD23)) && mrq->cmd->data && host->use_dma) {
|
|
+ /* DMA transfer starts now, PIO starts after interrupt */
|
|
+ bcm2835_mmc_transfer_dma(host);
|
|
+ }
|
|
+}
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
+{
|
|
+
|
|
+ struct bcm2835_host *host = mmc_priv(mmc);
|
|
+ unsigned long flags;
|
|
+ u8 ctrl;
|
|
+ u16 clk, ctrl_2;
|
|
+
|
|
+ pr_debug("bcm2835_mmc_set_ios: clock %d, pwr %d, bus_width %d, timing %d, vdd %d, drv_type %d\n",
|
|
+ ios->clock, ios->power_mode, ios->bus_width,
|
|
+ ios->timing, ios->signal_voltage, ios->drv_type);
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ if (!ios->clock || ios->clock != host->clock) {
|
|
+ bcm2835_mmc_set_clock(host, ios->clock);
|
|
+ host->clock = ios->clock;
|
|
+ }
|
|
+
|
|
+ if (host->pwr != SDHCI_POWER_330) {
|
|
+ host->pwr = SDHCI_POWER_330;
|
|
+ bcm2835_mmc_writeb(host, SDHCI_POWER_330 | SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
|
|
+ }
|
|
+
|
|
+ ctrl = bcm2835_mmc_readb(host, SDHCI_HOST_CONTROL);
|
|
+
|
|
+ /* set bus width */
|
|
+ ctrl &= ~SDHCI_CTRL_8BITBUS;
|
|
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
+ ctrl |= SDHCI_CTRL_4BITBUS;
|
|
+ else
|
|
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
|
|
+
|
|
+ ctrl &= ~SDHCI_CTRL_HISPD; /* NO_HISPD_BIT */
|
|
+
|
|
+
|
|
+ bcm2835_mmc_writeb(host, ctrl, SDHCI_HOST_CONTROL);
|
|
+ /*
|
|
+ * We only need to set Driver Strength if the
|
|
+ * preset value enable is not set.
|
|
+ */
|
|
+ ctrl_2 = bcm2835_mmc_readw(host, SDHCI_HOST_CONTROL2);
|
|
+ ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
|
|
+ if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
|
|
+ ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
|
|
+ else if (ios->drv_type == MMC_SET_DRIVER_TYPE_C)
|
|
+ ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
|
|
+
|
|
+ bcm2835_mmc_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
|
|
+
|
|
+ /* Reset SD Clock Enable */
|
|
+ clk = bcm2835_mmc_readw(host, SDHCI_CLOCK_CONTROL);
|
|
+ clk &= ~SDHCI_CLOCK_CARD_EN;
|
|
+ bcm2835_mmc_writew(host, clk, SDHCI_CLOCK_CONTROL);
|
|
+
|
|
+ /* Re-enable SD Clock */
|
|
+ bcm2835_mmc_set_clock(host, host->clock);
|
|
+ bcm2835_mmc_writeb(host, ctrl, SDHCI_HOST_CONTROL);
|
|
+
|
|
+ mmiowb();
|
|
+
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+}
|
|
+
|
|
+
|
|
+static struct mmc_host_ops bcm2835_ops = {
|
|
+ .request = bcm2835_mmc_request,
|
|
+ .set_ios = bcm2835_mmc_set_ios,
|
|
+ .enable_sdio_irq = bcm2835_mmc_enable_sdio_irq,
|
|
+};
|
|
+
|
|
+
|
|
+static void bcm2835_mmc_tasklet_finish(unsigned long param)
|
|
+{
|
|
+ struct bcm2835_host *host;
|
|
+ unsigned long flags;
|
|
+ struct mmc_request *mrq;
|
|
+
|
|
+ host = (struct bcm2835_host *)param;
|
|
+
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ /*
|
|
+ * If this tasklet gets rescheduled while running, it will
|
|
+ * be run again afterwards but without any active request.
|
|
+ */
|
|
+ if (!host->mrq) {
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ del_timer(&host->timer);
|
|
+
|
|
+ mrq = host->mrq;
|
|
+
|
|
+ /*
|
|
+ * The controller needs a reset of internal state machines
|
|
+ * upon error conditions.
|
|
+ */
|
|
+ if (!(host->flags & SDHCI_DEVICE_DEAD) &&
|
|
+ ((mrq->cmd && mrq->cmd->error) ||
|
|
+ (mrq->data && (mrq->data->error ||
|
|
+ (mrq->data->stop && mrq->data->stop->error))))) {
|
|
+
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_CMD);
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_DATA);
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+ }
|
|
+
|
|
+ host->mrq = NULL;
|
|
+ host->cmd = NULL;
|
|
+ host->data = NULL;
|
|
+
|
|
+ mmiowb();
|
|
+
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ mmc_request_done(host->mmc, mrq);
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
+static int bcm2835_mmc_add_host(struct bcm2835_host *host)
|
|
+{
|
|
+ struct mmc_host *mmc = host->mmc;
|
|
+ struct device *dev = mmc->parent;
|
|
+#ifndef FORCE_PIO
|
|
+ struct dma_slave_config cfg;
|
|
+#endif
|
|
+ int ret;
|
|
+
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_ALL);
|
|
+
|
|
+ host->clk_mul = 0;
|
|
+
|
|
+ mmc->f_max = host->max_clk;
|
|
+ mmc->f_max = host->max_clk;
|
|
+ mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_300;
|
|
+
|
|
+ /* SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK */
|
|
+ host->timeout_clk = mmc->f_max / 1000;
|
|
+ mmc->max_busy_timeout = (1 << 27) / host->timeout_clk;
|
|
+
|
|
+ /* host controller capabilities */
|
|
+ mmc->caps |= MMC_CAP_CMD23 | MMC_CAP_ERASE | MMC_CAP_NEEDS_POLL |
|
|
+ MMC_CAP_SDIO_IRQ | MMC_CAP_SD_HIGHSPEED |
|
|
+ MMC_CAP_MMC_HIGHSPEED;
|
|
+
|
|
+ mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
|
|
+
|
|
+ host->flags = SDHCI_AUTO_CMD23;
|
|
+
|
|
+ dev_info(dev, "mmc_debug:%x mmc_debug2:%x\n", mmc_debug, mmc_debug2);
|
|
+#ifdef FORCE_PIO
|
|
+ dev_info(dev, "Forcing PIO mode\n");
|
|
+ host->have_dma = false;
|
|
+#else
|
|
+ if (IS_ERR_OR_NULL(host->dma_chan_rxtx)) {
|
|
+ dev_err(dev, "%s: Unable to initialise DMA channel. Falling back to PIO\n",
|
|
+ DRIVER_NAME);
|
|
+ host->have_dma = false;
|
|
+ } else {
|
|
+ dev_info(dev, "DMA channel allocated");
|
|
+
|
|
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
+ cfg.slave_id = 11; /* DREQ channel */
|
|
+
|
|
+ /* Validate the slave configurations */
|
|
+
|
|
+ cfg.direction = DMA_MEM_TO_DEV;
|
|
+ cfg.src_addr = 0;
|
|
+ cfg.dst_addr = host->bus_addr + SDHCI_BUFFER;
|
|
+
|
|
+ ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
|
|
+
|
|
+ if (ret == 0) {
|
|
+ host->dma_cfg_tx = cfg;
|
|
+
|
|
+ cfg.direction = DMA_DEV_TO_MEM;
|
|
+ cfg.src_addr = host->bus_addr + SDHCI_BUFFER;
|
|
+ cfg.dst_addr = 0;
|
|
+
|
|
+ ret = dmaengine_slave_config(host->dma_chan_rxtx, &cfg);
|
|
+ }
|
|
+
|
|
+ if (ret == 0) {
|
|
+ host->dma_cfg_rx = cfg;
|
|
+
|
|
+ host->use_dma = true;
|
|
+ } else {
|
|
+ pr_err("%s: unable to configure DMA channel. "
|
|
+ "Faling back to PIO\n",
|
|
+ mmc_hostname(mmc));
|
|
+ dma_release_channel(host->dma_chan_rxtx);
|
|
+ host->dma_chan_rxtx = NULL;
|
|
+ host->use_dma = false;
|
|
+ }
|
|
+ }
|
|
+#endif
|
|
+ mmc->max_segs = 128;
|
|
+ mmc->max_req_size = 524288;
|
|
+ mmc->max_seg_size = mmc->max_req_size;
|
|
+ mmc->max_blk_size = 512;
|
|
+ mmc->max_blk_count = 65535;
|
|
+
|
|
+ /* report supported voltage ranges */
|
|
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
|
|
+
|
|
+ tasklet_init(&host->finish_tasklet,
|
|
+ bcm2835_mmc_tasklet_finish, (unsigned long)host);
|
|
+
|
|
+ setup_timer(&host->timer, bcm2835_mmc_timeout_timer, (unsigned long)host);
|
|
+ init_waitqueue_head(&host->buf_ready_int);
|
|
+
|
|
+ bcm2835_mmc_init(host, 0);
|
|
+ ret = devm_request_threaded_irq(dev, host->irq, bcm2835_mmc_irq,
|
|
+ bcm2835_mmc_thread_irq, IRQF_SHARED,
|
|
+ mmc_hostname(mmc), host);
|
|
+ if (ret) {
|
|
+ dev_err(dev, "Failed to request IRQ %d: %d\n", host->irq, ret);
|
|
+ goto untasklet;
|
|
+ }
|
|
+
|
|
+ mmiowb();
|
|
+ mmc_add_host(mmc);
|
|
+
|
|
+ return 0;
|
|
+
|
|
+untasklet:
|
|
+ tasklet_kill(&host->finish_tasklet);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int bcm2835_mmc_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device *dev = &pdev->dev;
|
|
+ struct device_node *node = dev->of_node;
|
|
+ struct clk *clk;
|
|
+ struct resource *iomem;
|
|
+ struct bcm2835_host *host;
|
|
+ struct mmc_host *mmc;
|
|
+ const __be32 *addr;
|
|
+ int ret;
|
|
+
|
|
+ mmc = mmc_alloc_host(sizeof(*host), dev);
|
|
+ if (!mmc)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ mmc->ops = &bcm2835_ops;
|
|
+ host = mmc_priv(mmc);
|
|
+ host->mmc = mmc;
|
|
+ host->timeout = msecs_to_jiffies(1000);
|
|
+ spin_lock_init(&host->lock);
|
|
+
|
|
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ host->ioaddr = devm_ioremap_resource(dev, iomem);
|
|
+ if (IS_ERR(host->ioaddr)) {
|
|
+ ret = PTR_ERR(host->ioaddr);
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ addr = of_get_address(node, 0, NULL, NULL);
|
|
+ if (!addr) {
|
|
+ dev_err(dev, "could not get DMA-register address\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+ host->bus_addr = be32_to_cpup(addr);
|
|
+ pr_debug(" - ioaddr %lx, iomem->start %lx, bus_addr %lx\n",
|
|
+ (unsigned long)host->ioaddr,
|
|
+ (unsigned long)iomem->start,
|
|
+ (unsigned long)host->bus_addr);
|
|
+
|
|
+#ifndef FORCE_PIO
|
|
+ if (node) {
|
|
+ host->dma_chan_rxtx = dma_request_slave_channel(dev, "rx-tx");
|
|
+ if (!host->dma_chan_rxtx)
|
|
+ host->dma_chan_rxtx =
|
|
+ dma_request_slave_channel(dev, "tx");
|
|
+ if (!host->dma_chan_rxtx)
|
|
+ host->dma_chan_rxtx =
|
|
+ dma_request_slave_channel(dev, "rx");
|
|
+ } else {
|
|
+ dma_cap_mask_t mask;
|
|
+
|
|
+ dma_cap_zero(mask);
|
|
+ /* we don't care about the channel, any would work */
|
|
+ dma_cap_set(DMA_SLAVE, mask);
|
|
+ host->dma_chan_rxtx = dma_request_channel(mask, NULL, NULL);
|
|
+ }
|
|
+#endif
|
|
+ clk = devm_clk_get(dev, NULL);
|
|
+ if (IS_ERR(clk)) {
|
|
+ ret = PTR_ERR(clk);
|
|
+ if (ret == -EPROBE_DEFER)
|
|
+ dev_info(dev, "could not get clk, deferring probe\n");
|
|
+ else
|
|
+ dev_err(dev, "could not get clk\n");
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ host->max_clk = clk_get_rate(clk);
|
|
+
|
|
+ host->irq = platform_get_irq(pdev, 0);
|
|
+ if (host->irq <= 0) {
|
|
+ dev_err(dev, "get IRQ failed\n");
|
|
+ ret = -EINVAL;
|
|
+ goto err;
|
|
+ }
|
|
+
|
|
+ if (node) {
|
|
+ mmc_of_parse(mmc);
|
|
+
|
|
+ /* Read any custom properties */
|
|
+ of_property_read_u32(node,
|
|
+ "brcm,overclock-50",
|
|
+ &host->overclock_50);
|
|
+ } else {
|
|
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
|
|
+ }
|
|
+
|
|
+ ret = bcm2835_mmc_add_host(host);
|
|
+ if (ret)
|
|
+ goto err;
|
|
+
|
|
+ platform_set_drvdata(pdev, host);
|
|
+
|
|
+ return 0;
|
|
+err:
|
|
+ mmc_free_host(mmc);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int bcm2835_mmc_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct bcm2835_host *host = platform_get_drvdata(pdev);
|
|
+ unsigned long flags;
|
|
+ int dead;
|
|
+ u32 scratch;
|
|
+
|
|
+ dead = 0;
|
|
+ scratch = bcm2835_mmc_readl(host, SDHCI_INT_STATUS);
|
|
+ if (scratch == (u32)-1)
|
|
+ dead = 1;
|
|
+
|
|
+
|
|
+ if (dead) {
|
|
+ spin_lock_irqsave(&host->lock, flags);
|
|
+
|
|
+ host->flags |= SDHCI_DEVICE_DEAD;
|
|
+
|
|
+ if (host->mrq) {
|
|
+ pr_err("%s: Controller removed during "
|
|
+ " transfer!\n", mmc_hostname(host->mmc));
|
|
+
|
|
+ host->mrq->cmd->error = -ENOMEDIUM;
|
|
+ tasklet_schedule(&host->finish_tasklet);
|
|
+ }
|
|
+
|
|
+ spin_unlock_irqrestore(&host->lock, flags);
|
|
+ }
|
|
+
|
|
+ mmc_remove_host(host->mmc);
|
|
+
|
|
+ if (!dead)
|
|
+ bcm2835_mmc_reset(host, SDHCI_RESET_ALL);
|
|
+
|
|
+ free_irq(host->irq, host);
|
|
+
|
|
+ del_timer_sync(&host->timer);
|
|
+
|
|
+ tasklet_kill(&host->finish_tasklet);
|
|
+
|
|
+ mmc_free_host(host->mmc);
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static const struct of_device_id bcm2835_mmc_match[] = {
|
|
+ { .compatible = "brcm,bcm2835-mmc" },
|
|
+ { }
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, bcm2835_mmc_match);
|
|
+
|
|
+
|
|
+
|
|
+static struct platform_driver bcm2835_mmc_driver = {
|
|
+ .probe = bcm2835_mmc_probe,
|
|
+ .remove = bcm2835_mmc_remove,
|
|
+ .driver = {
|
|
+ .name = DRIVER_NAME,
|
|
+ .owner = THIS_MODULE,
|
|
+ .of_match_table = bcm2835_mmc_match,
|
|
+ },
|
|
+};
|
|
+module_platform_driver(bcm2835_mmc_driver);
|
|
+
|
|
+module_param(mmc_debug, uint, 0644);
|
|
+module_param(mmc_debug2, uint, 0644);
|
|
+MODULE_ALIAS("platform:mmc-bcm2835");
|
|
+MODULE_DESCRIPTION("BCM2835 SDHCI driver");
|
|
+MODULE_LICENSE("GPL v2");
|
|
+MODULE_AUTHOR("Gellert Weisz");
|