path: root/recipes/linux/linux-2.6.18/atmel-mmc-host-driver.patch

From nobody Mon Sep 17 00:00:00 2001
From: Håvard Skinnemoen <hskinnemoen@atmel.com>
Date: Fri Nov 18 17:20:29 2005 +0100
Subject: [PATCH] AVR32: MMC Host Driver

---

 drivers/mmc/Kconfig     |   10 
 drivers/mmc/Makefile    |    1 
 drivers/mmc/atmel-mci.c |  738 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/mmc/atmel-mci.h |  192 ++++++++++++
 4 files changed, 941 insertions(+)

Index: linux-2.6.18-avr32/drivers/mmc/Kconfig
===================================================================
--- linux-2.6.18-avr32.orig/drivers/mmc/Kconfig	2007-01-15 10:14:40.000000000 +0100
+++ linux-2.6.18-avr32/drivers/mmc/Kconfig	2007-01-15 10:14:46.000000000 +0100
@@ -71,6 +71,16 @@ config MMC_OMAP
 
 	  If unsure, say N.
 
+config MMC_ATMELMCI
+	tristate "Atmel Multimedia Card Interface support"
+	depends on AVR32 && MMC
+	help
+	  This selects the Atmel Multimedia Card Interface. If you have
+	  a AT91 (ARM) or AT32 (AVR32) platform with a Multimedia Card
+	  slot, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_WBSD
 	tristate "Winbond W83L51xD SD/MMC Card Interface support"
 	depends on MMC && ISA_DMA_API
Index: linux-2.6.18-avr32/drivers/mmc/Makefile
===================================================================
--- linux-2.6.18-avr32.orig/drivers/mmc/Makefile	2007-01-15 10:14:40.000000000 +0100
+++ linux-2.6.18-avr32/drivers/mmc/Makefile	2007-01-15 10:14:46.000000000 +0100
@@ -23,6 +23,7 @@ obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
 obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
 obj-$(CONFIG_MMC_OMAP)		+= omap.o
 obj-$(CONFIG_MMC_AT91RM9200)	+= at91_mci.o
+obj-$(CONFIG_MMC_ATMELMCI)	+= atmel-mci.o
 
 mmc_core-y := mmc.o mmc_queue.o mmc_sysfs.o
 
Index: linux-2.6.18-avr32/drivers/mmc/atmel-mci.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-avr32/drivers/mmc/atmel-mci.c	2007-01-15 10:31:55.000000000 +0100
@@ -0,0 +1,738 @@
+/*
+ * Atmel MultiMedia Card Interface driver
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/blkdev.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/dma-controller.h>
+#include <asm/io.h>
+
+#include "atmel-mci.h"
+
+#define DRIVER_NAME "mmci"
+
+#define MCI_CMD_ERROR_FLAGS	(MCI_BIT(RINDE)	| MCI_BIT(RDIRE) |	\
+				 MCI_BIT(RCRCE) | MCI_BIT(RENDE) |	\
+				 MCI_BIT(RTOE))
+#define MCI_DATA_ERROR_FLAGS	(MCI_BIT(DCRCE) | MCI_BIT(DTOE) |	\
+				 MCI_BIT(OVRE) | MCI_BIT(UNRE))
+
+enum {
+	EVENT_CMD_COMPLETE = 0,
+	EVENT_CMD_ERROR,
+	EVENT_DATA_COMPLETE,
+	EVENT_DATA_ERROR,
+	EVENT_STOP_SENT,
+	EVENT_STOP_COMPLETE,
+	EVENT_STOP_ERROR,
+	EVENT_DMA_ERROR,
+};
+
+struct atmel_mci_dma {
+	struct dma_request_sg	req;
+	unsigned short		rx_periph_id;
+	unsigned short		tx_periph_id;
+	int			blocks_left;
+};
+
+struct atmel_mci {
+	struct mmc_host		*mmc;
+	void __iomem		*regs;
+	struct atmel_mci_dma	dma;
+
+	struct mmc_request	*mrq;
+	struct mmc_command	*cmd;
+	struct mmc_data		*data;
+
+	u32			stop_cmdr;
+	u32			stop_iflags;
+
+	struct tasklet_struct	tasklet;
+	unsigned long		pending_events;
+	unsigned long		completed_events;
+	u32			error_status;
+
+	unsigned long		bus_hz;
+	unsigned long		mapbase;
+	struct clk		*mck;
+	struct platform_device	*pdev;
+};
+
+/* Those printks take an awful lot of time... */
+#ifndef DEBUG
+static unsigned int fmax = 15000000U;
+#else
+static unsigned int fmax = 1000000U;
+#endif
+module_param(fmax, uint, 0444);
+MODULE_PARM_DESC(fmax, "Max frequency in Hz of the MMC bus clock");
+
+static inline unsigned int ns_to_clocks(struct atmel_mci *host,
+					unsigned int ns)
+{
+	return (ns * (host->bus_hz / 1000000) + 999) / 1000;
+}
+
+static void atmci_set_timeout(struct atmel_mci *host,
+			      struct mmc_data *data)
+{
+	static unsigned dtomul_to_shift[] = {
+		0, 4, 7, 8, 10, 12, 16, 20
+	};
+	unsigned timeout;
+	unsigned dtocyc, dtomul;
+
+	timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks;
+
+	for (dtomul = 0; dtomul < 8; dtomul++) {
+		unsigned shift = dtomul_to_shift[dtomul];
+		dtocyc = (timeout + (1 << shift) - 1) >> shift;
+		if (dtocyc < 15)
+			break;
+	}
+
+	if (dtomul >= 8) {
+		dtomul = 7;
+		dtocyc = 15;
+	}
+
+	pr_debug("%s: setting timeout to %u cycles\n",
+		 mmc_hostname(host->mmc),
+		 dtocyc << dtomul_to_shift[dtomul]);
+	mci_writel(host, DTOR, (MCI_BF(DTOMUL, dtomul)
+				| MCI_BF(DTOCYC, dtocyc)));
+}
+
+/*
+ * Return mask with interrupt flags to be handled for this command.
+ */
+static u32 atmci_prepare_command(struct mmc_host *mmc,
+				 struct mmc_command *cmd,
+				 u32 *cmd_flags)
+{
+	u32 cmdr;
+	u32 iflags;
+
+	cmd->error = MMC_ERR_NONE;
+
+	cmdr = 0;
+	BUG_ON(MCI_BFEXT(CMDNB, cmdr) != 0);
+	cmdr = MCI_BFINS(CMDNB, cmd->opcode, cmdr);
+
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136)
+			cmdr |= MCI_BF(RSPTYP, MCI_RSPTYP_136_BIT);
+		else
+			cmdr |= MCI_BF(RSPTYP, MCI_RSPTYP_48_BIT);
+	}
+
+	/*
+	 * This should really be MAXLAT_5 for CMD2 and ACMD41, but
+	 * it's too difficult to determine whether this is an ACMD or
+	 * not. Better make it 64.
+	 */
+	cmdr |= MCI_BIT(MAXLAT);
+
+	if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
+		cmdr |= MCI_BIT(OPDCMD);
+
+	iflags = MCI_BIT(CMDRDY) | MCI_CMD_ERROR_FLAGS;
+	if (!(cmd->flags & MMC_RSP_CRC))
+		iflags &= ~MCI_BIT(RCRCE);
+
+	pr_debug("%s: cmd: op %02x arg %08x flags %08x, cmdflags %08lx\n",
+		 mmc_hostname(mmc), cmd->opcode, cmd->arg, cmd->flags,
+		 (unsigned long)cmdr);
+
+	*cmd_flags = cmdr;
+	return iflags;
+}
+
+static void atmci_start_command(struct atmel_mci *host,
+				struct mmc_command *cmd,
+				u32 cmd_flags)
+{
+	WARN_ON(host->cmd);
+	host->cmd = cmd;
+
+	mci_writel(host, ARGR, cmd->arg);
+	mci_writel(host, CMDR, cmd_flags);
+
+	if (cmd->data)
+		dma_start_request(host->dma.req.req.dmac,
+				  host->dma.req.req.channel);
+}
+
+/*
+ * Returns a mask of flags to be set in the command register when the
+ * command to start the transfer is to be sent.
+ */
+static u32 atmci_prepare_data(struct mmc_host *mmc, struct mmc_data *data)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+	u32 cmd_flags;
+
+	WARN_ON(host->data);
+	host->data = data;
+
+	atmci_set_timeout(host, data);
+	mci_writel(host, BLKR, (MCI_BF(BCNT, data->blocks)
+				| MCI_BF(BLKLEN, data->blksz)));
+	host->dma.req.block_size = data->blksz;
+
+	cmd_flags = MCI_BF(TRCMD, MCI_TRCMD_START_TRANS);
+	if (data->flags & MMC_DATA_STREAM)
+		cmd_flags |= MCI_BF(TRTYP, MCI_TRTYP_STREAM);
+	else if (data->blocks > 1)
+		cmd_flags |= MCI_BF(TRTYP, MCI_TRTYP_MULTI_BLOCK);
+	else
+		cmd_flags |= MCI_BF(TRTYP, MCI_TRTYP_BLOCK);
+
+	if (data->flags & MMC_DATA_READ) {
+		cmd_flags |= MCI_BIT(TRDIR);
+		host->dma.req.nr_sg
+			= dma_map_sg(&host->pdev->dev, data->sg,
+				     data->sg_len, DMA_FROM_DEVICE);
+		host->dma.req.periph_id = host->dma.rx_periph_id;
+		host->dma.req.direction = DMA_DIR_PERIPH_TO_MEM;
+		host->dma.req.data_reg = host->mapbase + MCI_RDR;
+	} else {
+		host->dma.req.nr_sg
+			= dma_map_sg(&host->pdev->dev, data->sg,
+				     data->sg_len, DMA_TO_DEVICE);
+		host->dma.req.periph_id = host->dma.tx_periph_id;
+		host->dma.req.direction = DMA_DIR_MEM_TO_PERIPH;
+		host->dma.req.data_reg = host->mapbase + MCI_TDR;
+	}
+	host->dma.req.sg = data->sg;
+	host->dma.blocks_left = data->blocks;
+
+	dma_prepare_request_sg(host->dma.req.req.dmac, &host->dma.req);
+
+	return cmd_flags;
+}
+
+static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+	u32 iflags;
+	u32 cmdflags = 0;
+
+	iflags = mci_readl(host, IMR);
+	if (iflags)
+		printk("WARNING: IMR=0x%08x\n", mci_readl(host, IMR));
+
+	WARN_ON(host->mrq != NULL);
+	host->mrq = mrq;
+	host->pending_events = 0;
+	host->completed_events = 0;
+
+	iflags = atmci_prepare_command(mmc, mrq->cmd, &cmdflags);
+
+	if (mrq->stop) {
+		BUG_ON(!data);
+
+		host->stop_iflags = atmci_prepare_command(mmc, mrq->stop,
+							  &host->stop_cmdr);
+		host->stop_cmdr |= MCI_BF(TRCMD, MCI_TRCMD_STOP_TRANS);
+		if (!(data->flags & MMC_DATA_WRITE))
+			host->stop_cmdr |= MCI_BIT(TRDIR);
+		if (data->flags & MMC_DATA_STREAM)
+			host->stop_cmdr |= MCI_BF(TRTYP, MCI_TRTYP_STREAM);
+		else
+			host->stop_cmdr |= MCI_BF(TRTYP, MCI_TRTYP_MULTI_BLOCK);
+	}
+	if (data) {
+		cmdflags |= atmci_prepare_data(mmc, data);
+		iflags |= MCI_DATA_ERROR_FLAGS;
+	}
+
+	atmci_start_command(host, mrq->cmd, cmdflags);
+	mci_writel(host, IER, iflags);
+}
+
+static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+
+	if (ios->clock) {
+		u32 clkdiv;
+
+		clkdiv = host->bus_hz / (2 * ios->clock) - 1;
+		if (clkdiv > 255)
+			clkdiv = 255;
+		mci_writel(host, MR, (clkdiv
+				      | MCI_BIT(WRPROOF)
+				      | MCI_BIT(RDPROOF)));
+	}
+
+	switch (ios->bus_width) {
+	case MMC_BUS_WIDTH_1:
+		mci_writel(host, SDCR, 0);
+		break;
+	case MMC_BUS_WIDTH_4:
+		mci_writel(host, SDCR, MCI_BIT(SDCBUS));
+		break;
+	}
+
+	switch (ios->power_mode) {
+	case MMC_POWER_OFF:
+		mci_writel(host, CR, MCI_BIT(MCIDIS));
+		break;
+	case MMC_POWER_UP:
+		mci_writel(host, CR, MCI_BIT(SWRST));
+		break;
+	case MMC_POWER_ON:
+		mci_writel(host, CR, MCI_BIT(MCIEN));
+		break;
+	}
+}
+
+static struct mmc_host_ops atmci_ops = {
+	.request	= atmci_request,
+	.set_ios	= atmci_set_ios,
+};
+
+static void atmci_request_end(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+
+	WARN_ON(host->cmd || host->data);
+	host->mrq = NULL;
+
+	mmc_request_done(mmc, mrq);
+}
+
+static void send_stop_cmd(struct mmc_host *mmc, struct mmc_data *data,
+			  u32 flags)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+
+	atmci_start_command(host, data->stop, host->stop_cmdr | flags);
+	mci_writel(host, IER, host->stop_iflags);
+}
+
+static void atmci_data_complete(struct atmel_mci *host, struct mmc_data *data)
+{
+	host->data = NULL;
+	dma_unmap_sg(&host->pdev->dev, data->sg, host->dma.req.nr_sg,
+		     ((data->flags & MMC_DATA_WRITE)
+		      ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+
+	/*
+	 * Data might complete before command for very short transfers
+	 * (like READ_SCR)
+	 */
+	if (test_bit(EVENT_CMD_COMPLETE, &host->completed_events)
+	    && (!data->stop
+		|| test_bit(EVENT_STOP_COMPLETE, &host->completed_events)))
+		atmci_request_end(host->mmc, data->mrq);
+}
+
+static void atmci_command_error(struct mmc_host *mmc,
+				struct mmc_command *cmd,
+				u32 status)
+{
+	pr_debug("%s: command error: status=0x%08x\n",
+		 mmc_hostname(mmc), status);
+
+	if (status & MCI_BIT(RTOE))
+		cmd->error = MMC_ERR_TIMEOUT;
+	else if (status & MCI_BIT(RCRCE))
+		cmd->error = MMC_ERR_BADCRC;
+	else
+		cmd->error = MMC_ERR_FAILED;
+}
+
+static void atmci_tasklet_func(unsigned long priv)
+{
+	struct mmc_host *mmc = (struct mmc_host *)priv;
+	struct atmel_mci *host = mmc_priv(mmc);
+	struct mmc_request *mrq = host->mrq;
+	struct mmc_data *data = host->data;
+
+	pr_debug("atmci_tasklet: pending/completed/mask %lx/%lx/%x\n",
+		 host->pending_events, host->completed_events,
+		 mci_readl(host, IMR));
+
+	if (test_and_clear_bit(EVENT_CMD_ERROR, &host->pending_events)) {
+		struct mmc_command *cmd;
+
+		set_bit(EVENT_CMD_ERROR, &host->completed_events);
+		clear_bit(EVENT_CMD_COMPLETE, &host->pending_events);
+		cmd = host->mrq->cmd;
+
+		if (cmd->data) {
+			dma_stop_request(host->dma.req.req.dmac,
+					 host->dma.req.req.channel);
+			host->data = NULL;
+		}
+
+		atmci_command_error(mmc, cmd, host->error_status);
+		atmci_request_end(mmc, cmd->mrq);
+	}
+	if (test_and_clear_bit(EVENT_STOP_ERROR, &host->pending_events)) {
+		set_bit(EVENT_STOP_ERROR, &host->completed_events);
+		clear_bit(EVENT_STOP_COMPLETE, &host->pending_events);
+		atmci_command_error(mmc, host->mrq->stop,
+				    host->error_status);
+		if (!host->data)
+			atmci_request_end(mmc, host->mrq);
+	}
+	if (test_and_clear_bit(EVENT_CMD_COMPLETE, &host->pending_events)) {
+		set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
+		if (!mrq->data
+		    || test_bit(EVENT_DATA_COMPLETE, &host->completed_events))
+			atmci_request_end(mmc, mrq);
+	}
+	if (test_and_clear_bit(EVENT_STOP_COMPLETE, &host->pending_events)) {
+		set_bit(EVENT_STOP_COMPLETE, &host->completed_events);
+		if (test_bit(EVENT_DATA_COMPLETE, &host->completed_events))
+			atmci_request_end(mmc, mrq);
+	}
+	if (test_and_clear_bit(EVENT_DMA_ERROR, &host->pending_events)) {
+		set_bit(EVENT_DMA_ERROR, &host->completed_events);
+		clear_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+
+		/* DMA controller got bus error => invalid address */
+		data->error = MMC_ERR_INVALID;
+
+		printk(KERN_DEBUG "%s: dma error after %u bytes xfered\n",
+		       mmc_hostname(mmc), host->data->bytes_xfered);
+
+		if (data->stop
+		    && !test_and_set_bit(EVENT_STOP_SENT,
+					 &host->completed_events))
+			/* TODO: Check if card is still present */
+			send_stop_cmd(host->mmc, data, 0);
+
+		atmci_data_complete(host, data);
+	}
+	if (test_and_clear_bit(EVENT_DATA_ERROR, &host->pending_events)) {
+		u32 status = host->error_status;
+
+		set_bit(EVENT_DATA_ERROR, &host->completed_events);
+		clear_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+
+		dma_stop_request(host->dma.req.req.dmac,
+				 host->dma.req.req.channel);
+
+		printk(KERN_DEBUG "%s: data error: status=0x%08x\n",
+		       mmc_hostname(host->mmc), status);
+
+		if (status & MCI_BIT(DCRCE)) {
+			printk(KERN_DEBUG "%s: Data CRC error\n",
+			       mmc_hostname(host->mmc));
+			data->error = MMC_ERR_BADCRC;
+		} else if (status & MCI_BIT(DTOE)) {
+			printk(KERN_DEBUG "%s: Data Timeout error\n",
+			       mmc_hostname(host->mmc));
+			data->error = MMC_ERR_TIMEOUT;
+		} else {
+			printk(KERN_DEBUG "%s: Data FIFO error\n",
+			       mmc_hostname(host->mmc));
+			data->error = MMC_ERR_FIFO;
+		}
+		printk(KERN_DEBUG "%s: Bytes xfered: %u\n",
+		       mmc_hostname(host->mmc), data->bytes_xfered);
+
+		if (data->stop
+		    && !test_and_set_bit(EVENT_STOP_SENT, &host->completed_events))
+			/* TODO: Check if card is still present */
+			send_stop_cmd(host->mmc, data, 0);
+
+		atmci_data_complete(host, data);
+	}
+	if (test_and_clear_bit(EVENT_DATA_COMPLETE, &host->pending_events)) {
+		set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
+		data->bytes_xfered = data->blocks * data->blksz;
+		atmci_data_complete(host, data);
+	}
+}
+
+static void atmci_cmd_interrupt(struct mmc_host *mmc, u32 status)
+{
+	struct atmel_mci *host = mmc_priv(mmc);
+	struct mmc_command *cmd = host->cmd;
+
+	/*
+	 * Read the response now so that we're free to send a new
+	 * command immediately.
+	 */
+	cmd->resp[0] = mci_readl(host, RSPR);
+	cmd->resp[1] = mci_readl(host, RSPR);
+	cmd->resp[2] = mci_readl(host, RSPR);
+	cmd->resp[3] = mci_readl(host, RSPR);
+
+	mci_writel(host, IDR, MCI_BIT(CMDRDY) | MCI_CMD_ERROR_FLAGS);
+	host->cmd = NULL;
+
+	if (test_bit(EVENT_STOP_SENT, &host->completed_events))
+		set_bit(EVENT_STOP_COMPLETE, &host->pending_events);
+	else
+		set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
+
+	tasklet_schedule(&host->tasklet);
+}
+
+static void atmci_xfer_complete(struct dma_request *_req)
+{
+	struct dma_request_sg *req = to_dma_request_sg(_req);
+	struct atmel_mci_dma *dma;
+	struct atmel_mci *host;
+	struct mmc_data *data;
+
+	dma = container_of(req, struct atmel_mci_dma, req);
+	host = container_of(dma, struct atmel_mci, dma);
+	data = host->data;
+
+	if (data->stop && !test_and_set_bit(EVENT_STOP_SENT,
+					    &host->completed_events))
+		send_stop_cmd(host->mmc, data, 0);
+
+	if (data->flags & MMC_DATA_READ) {
+		mci_writel(host, IDR, MCI_DATA_ERROR_FLAGS);
+		set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+		tasklet_schedule(&host->tasklet);
+	} else {
+		/*
+		 * For the WRITE case, wait for NOTBUSY. This function
+		 * is called when everything has been written to the
+		 * controller, not when the card is done programming.
+		 */
+		mci_writel(host, IER, MCI_BIT(NOTBUSY));
+	}
+}
+
+static void atmci_dma_error(struct dma_request *_req)
+{
+	struct dma_request_sg *req = to_dma_request_sg(_req);
+	struct atmel_mci_dma *dma;
+	struct atmel_mci *host;
+
+	dma = container_of(req, struct atmel_mci_dma, req);
+	host = container_of(dma, struct atmel_mci, dma);
+
+	mci_writel(host, IDR, (MCI_BIT(NOTBUSY)
+			       | MCI_DATA_ERROR_FLAGS));
+
+	set_bit(EVENT_DMA_ERROR, &host->pending_events);
+	tasklet_schedule(&host->tasklet);
+}
+
+static irqreturn_t atmci_interrupt(int irq, void *dev_id,
+				   struct pt_regs *regs)
+{
+	struct mmc_host *mmc = dev_id;
+	struct atmel_mci *host = mmc_priv(mmc);
+	u32 status, mask, pending;
+
+	spin_lock(&mmc->lock);
+
+	status = mci_readl(host, SR);
+	mask = mci_readl(host, IMR);
+	pending = status & mask;
+
+	do {
+		if (pending & MCI_CMD_ERROR_FLAGS) {
+			mci_writel(host, IDR, (MCI_BIT(CMDRDY)
+					       | MCI_BIT(NOTBUSY)
+					       | MCI_CMD_ERROR_FLAGS
+					       | MCI_DATA_ERROR_FLAGS));
+			host->error_status = status;
+			host->cmd = NULL;
+			if (test_bit(EVENT_STOP_SENT, &host->completed_events))
+				set_bit(EVENT_STOP_ERROR, &host->pending_events);
+			else
+				set_bit(EVENT_CMD_ERROR, &host->pending_events);
+			tasklet_schedule(&host->tasklet);
+			break;
+		}
+		if (pending & MCI_DATA_ERROR_FLAGS) {
+			mci_writel(host, IDR, (MCI_BIT(NOTBUSY)
+					       | MCI_DATA_ERROR_FLAGS));
+			host->error_status = status;
+			set_bit(EVENT_DATA_ERROR, &host->pending_events);
+			tasklet_schedule(&host->tasklet);
+			break;
+		}
+		if (pending & MCI_BIT(CMDRDY))
+			atmci_cmd_interrupt(mmc, status);
+		if (pending & MCI_BIT(NOTBUSY)) {
+			mci_writel(host, IDR, (MCI_BIT(NOTBUSY)
+					       | MCI_DATA_ERROR_FLAGS));
+			set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+			tasklet_schedule(&host->tasklet);
+		}
+
+		status = mci_readl(host, SR);
+		mask = mci_readl(host, IMR);
+		pending = status & mask;
+	} while (pending);
+
+	spin_unlock(&mmc->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit atmci_probe(struct platform_device *pdev)
+{
+	struct atmel_mci *host;
+	struct mmc_host *mmc;
+	struct resource *regs;
+	int irq;
+	int ret;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs)
+		return -ENXIO;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	mmc = mmc_alloc_host(sizeof(struct atmel_mci), &pdev->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	host = mmc_priv(mmc);
+	host->pdev = pdev;
+	host->mmc = mmc;
+
+	host->mck = clk_get(&pdev->dev, "mck");
+	if (IS_ERR(host->mck)) {
+		ret = PTR_ERR(host->mck);
+		goto out_free_host;
+	}
+	clk_enable(host->mck);
+
+	ret = -ENOMEM;
+	host->regs = ioremap(regs->start, regs->end - regs->start + 1);
+	if (!host->regs)
+		goto out_disable_clk;
+
+	host->bus_hz = clk_get_rate(host->mck);
+	host->mapbase = regs->start;
+
+	mmc->ops = &atmci_ops;
+	mmc->f_min = (host->bus_hz + 511) / 512;
+	mmc->f_max = min((unsigned int)(host->bus_hz / 2), fmax);
+	mmc->ocr_avail	= 0x00100000;
+	mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+	tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)mmc);
+
+	ret = request_irq(irq, atmci_interrupt, 0, "mmci", mmc);
+	if (ret)
+		goto out_unmap;
+
+	/* TODO: Get this information from platform data */
+	ret = -ENOMEM;
+	host->dma.req.req.dmac = find_dma_controller(0);
+	if (!host->dma.req.req.dmac) {
+		printk(KERN_ERR
+		       "mmci: No DMA controller available, aborting\n");
+		goto out_free_irq;
+	}
+	ret = dma_alloc_channel(host->dma.req.req.dmac);
+	if (ret < 0) {
+		printk(KERN_ERR
+		       "mmci: Unable to allocate DMA channel, aborting\n");
+		goto out_free_irq;
+	}
+	host->dma.req.req.channel = ret;
+	host->dma.req.width = DMA_WIDTH_32BIT;
+	host->dma.req.req.xfer_complete = atmci_xfer_complete;
+	host->dma.req.req.block_complete = NULL; // atmci_block_complete;
+	host->dma.req.req.error = atmci_dma_error;
+	host->dma.rx_periph_id = 0;
+	host->dma.tx_periph_id = 1;
+
+	mci_writel(host, CR, MCI_BIT(SWRST));
+	mci_writel(host, IDR, ~0UL);
+	mci_writel(host, CR, MCI_BIT(MCIEN));
+
+	platform_set_drvdata(pdev, host);
+
+	mmc_add_host(mmc);
+
+	printk(KERN_INFO "%s: Atmel MCI controller at 0x%08lx irq %d\n",
+	       mmc_hostname(mmc), host->mapbase, irq);
+
+	return 0;
+
+out_free_irq:
+	free_irq(irq, mmc);
+out_unmap:
+	iounmap(host->regs);
+out_disable_clk:
+	clk_disable(host->mck);
+	clk_put(host->mck);
+out_free_host:
+	mmc_free_host(mmc);
+	return ret;
+}
+
+static int __devexit atmci_remove(struct platform_device *pdev)
+{
+	struct atmel_mci *host = platform_get_drvdata(pdev);
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (host) {
+		mmc_remove_host(host->mmc);
+
+		mci_writel(host, IDR, ~0UL);
+		mci_writel(host, CR, MCI_BIT(MCIDIS));
+		mci_readl(host, SR);
+
+		free_irq(platform_get_irq(pdev, 0), host->mmc);
+		iounmap(host->regs);
+
+		clk_disable(host->mck);
+		clk_put(host->mck);
+
+		mmc_free_host(host->mmc);
+	}
+	return 0;
+}
+
+static struct platform_driver atmci_driver = {
+	.probe		= atmci_probe,
+	.remove		= __devexit_p(atmci_remove),
+	.driver		= {
+		.name		= DRIVER_NAME,
+	},
+};
+
+static int __init atmci_init(void)
+{
+	return platform_driver_register(&atmci_driver);
+}
+
+static void __exit atmci_exit(void)
+{
+	platform_driver_unregister(&atmci_driver);
+}
+
+module_init(atmci_init);
+module_exit(atmci_exit);
+
+MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.18-avr32/drivers/mmc/atmel-mci.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.18-avr32/drivers/mmc/atmel-mci.h	2007-01-15 10:31:36.000000000 +0100
@@ -0,0 +1,192 @@
+/*
+ * Atmel MultiMedia Card Interface driver
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __DRIVERS_MMC_ATMEL_MCI_H__
+#define __DRIVERS_MMC_ATMEL_MCI_H__
+
+/* MCI register offsets */
+#define MCI_CR					0x0000
+#define MCI_MR					0x0004
+#define MCI_DTOR				0x0008
+#define MCI_SDCR				0x000c
+#define MCI_ARGR				0x0010
+#define MCI_CMDR				0x0014
+#define MCI_BLKR				0x0018
+#define MCI_RSPR				0x0020
+#define MCI_RSPR1				0x0024
+#define MCI_RSPR2				0x0028
+#define MCI_RSPR3				0x002c
+#define MCI_RDR					0x0030
+#define MCI_TDR					0x0034
+#define MCI_SR					0x0040
+#define MCI_IER					0x0044
+#define MCI_IDR					0x0048
+#define MCI_IMR					0x004c
+
+/* Bitfields in CR */
+#define MCI_MCIEN_OFFSET			0
+#define MCI_MCIEN_SIZE				1
+#define MCI_MCIDIS_OFFSET			1
+#define MCI_MCIDIS_SIZE				1
+#define MCI_PWSEN_OFFSET			2
+#define MCI_PWSEN_SIZE				1
+#define MCI_PWSDIS_OFFSET			3
+#define MCI_PWSDIS_SIZE				1
+#define MCI_SWRST_OFFSET			7
+#define MCI_SWRST_SIZE				1
+
+/* Bitfields in MR */
+#define MCI_CLKDIV_OFFSET			0
+#define MCI_CLKDIV_SIZE				8
+#define MCI_PWSDIV_OFFSET			8
+#define MCI_PWSDIV_SIZE				3
+#define MCI_RDPROOF_OFFSET			11
+#define MCI_RDPROOF_SIZE			1
+#define MCI_WRPROOF_OFFSET			12
+#define MCI_WRPROOF_SIZE			1
+#define MCI_DMAPADV_OFFSET			14
+#define MCI_DMAPADV_SIZE			1
+#define MCI_BLKLEN_OFFSET			16
+#define MCI_BLKLEN_SIZE				16
+
+/* Bitfields in DTOR */
+#define MCI_DTOCYC_OFFSET			0
+#define MCI_DTOCYC_SIZE				4
+#define MCI_DTOMUL_OFFSET			4
+#define MCI_DTOMUL_SIZE				3
+
+/* Bitfields in SDCR */
+#define MCI_SDCSEL_OFFSET			0
+#define MCI_SDCSEL_SIZE				4
+#define MCI_SDCBUS_OFFSET			7
+#define MCI_SDCBUS_SIZE				1
+
+/* Bitfields in ARGR */
+#define MCI_ARG_OFFSET				0
+#define MCI_ARG_SIZE				32
+
+/* Bitfields in CMDR */
+#define MCI_CMDNB_OFFSET			0
+#define MCI_CMDNB_SIZE				6
+#define MCI_RSPTYP_OFFSET			6
+#define MCI_RSPTYP_SIZE				2
+#define MCI_SPCMD_OFFSET			8
+#define MCI_SPCMD_SIZE				3
+#define MCI_OPDCMD_OFFSET			11
+#define MCI_OPDCMD_SIZE				1
+#define MCI_MAXLAT_OFFSET			12
+#define MCI_MAXLAT_SIZE				1
+#define MCI_TRCMD_OFFSET			16
+#define MCI_TRCMD_SIZE				2
+#define MCI_TRDIR_OFFSET			18
+#define MCI_TRDIR_SIZE				1
+#define MCI_TRTYP_OFFSET			19
+#define MCI_TRTYP_SIZE				2
+
+/* Bitfields in BLKR */
+#define MCI_BCNT_OFFSET				0
+#define MCI_BCNT_SIZE				16
+
+/* Bitfields in RSPRn */
+#define MCI_RSP_OFFSET				0
+#define MCI_RSP_SIZE				32
+
+/* Bitfields in SR/IER/IDR/IMR */
+#define MCI_CMDRDY_OFFSET			0
+#define MCI_CMDRDY_SIZE				1
+#define MCI_RXRDY_OFFSET			1
+#define MCI_RXRDY_SIZE				1
+#define MCI_TXRDY_OFFSET			2
+#define MCI_TXRDY_SIZE				1
+#define MCI_BLKE_OFFSET				3
+#define MCI_BLKE_SIZE				1
+#define MCI_DTIP_OFFSET				4
+#define MCI_DTIP_SIZE				1
+#define MCI_NOTBUSY_OFFSET			5
+#define MCI_NOTBUSY_SIZE			1
+#define MCI_ENDRX_OFFSET			6
+#define MCI_ENDRX_SIZE				1
+#define MCI_ENDTX_OFFSET			7
+#define MCI_ENDTX_SIZE				1
+#define MCI_RXBUFF_OFFSET			14
+#define MCI_RXBUFF_SIZE				1
+#define MCI_TXBUFE_OFFSET			15
+#define MCI_TXBUFE_SIZE				1
+#define MCI_RINDE_OFFSET			16
+#define MCI_RINDE_SIZE				1
+#define MCI_RDIRE_OFFSET			17
+#define MCI_RDIRE_SIZE				1
+#define MCI_RCRCE_OFFSET			18
+#define MCI_RCRCE_SIZE				1
+#define MCI_RENDE_OFFSET			19
+#define MCI_RENDE_SIZE				1
+#define MCI_RTOE_OFFSET				20
+#define MCI_RTOE_SIZE				1
+#define MCI_DCRCE_OFFSET			21
+#define MCI_DCRCE_SIZE				1
+#define MCI_DTOE_OFFSET				22
+#define MCI_DTOE_SIZE				1
+#define MCI_OVRE_OFFSET				30
+#define MCI_OVRE_SIZE				1
+#define MCI_UNRE_OFFSET				31
+#define MCI_UNRE_SIZE				1
+
+/* Constants for DTOMUL */
+#define MCI_DTOMUL_1_CYCLE			0
+#define MCI_DTOMUL_16_CYCLES			1
+#define MCI_DTOMUL_128_CYCLES			2
+#define MCI_DTOMUL_256_CYCLES			3
+#define MCI_DTOMUL_1024_CYCLES			4
+#define MCI_DTOMUL_4096_CYCLES			5
+#define MCI_DTOMUL_65536_CYCLES			6
+#define MCI_DTOMUL_1048576_CYCLES		7
+
+/* Constants for RSPTYP */
+#define MCI_RSPTYP_NO_RESP			0
+#define MCI_RSPTYP_48_BIT			1
+#define MCI_RSPTYP_136_BIT			2
+
+/* Constants for SPCMD */
+#define MCI_SPCMD_NO_SPEC_CMD			0
+#define MCI_SPCMD_INIT_CMD			1
+#define MCI_SPCMD_SYNC_CMD			2
+#define MCI_SPCMD_INT_CMD			4
+#define MCI_SPCMD_INT_RESP			5
+
+/* Constants for TRCMD */
+#define MCI_TRCMD_NO_TRANS			0
+#define MCI_TRCMD_START_TRANS			1
+#define MCI_TRCMD_STOP_TRANS			2
+
+/* Constants for TRTYP */
+#define MCI_TRTYP_BLOCK				0
+#define MCI_TRTYP_MULTI_BLOCK			1
+#define MCI_TRTYP_STREAM			2
+
+/* Bit manipulation macros */
+#define MCI_BIT(name)					\
+	(1 << MCI_##name##_OFFSET)
+#define MCI_BF(name,value)				\
+	(((value) & ((1 << MCI_##name##_SIZE) - 1))	\
+	 << MCI_##name##_OFFSET)
+#define MCI_BFEXT(name,value)				\
+	(((value) >> MCI_##name##_OFFSET)		\
+	 & ((1 << MCI_##name##_SIZE) - 1))
+#define MCI_BFINS(name,value,old)			\
+	(((old) & ~(((1 << MCI_##name##_SIZE) - 1)	\
+		    << MCI_##name##_OFFSET))		\
+	 | MCI_BF(name,value))
+
+/* Register access macros */
+#define mci_readl(port,reg)				\
+	__raw_readl((port)->regs + MCI_##reg)
+#define mci_writel(port,reg,value)			\
+	__raw_writel((value), (port)->regs + MCI_##reg)
+
+#endif /* __DRIVERS_MMC_ATMEL_MCI_H__ */