path: root/drivers/mmc/host/atmel-mci.c

/*
 * Atmel MultiMedia Card Interface driver
 *
 * Copyright (C) 2004-2008 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/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/stat.h>

#include <linux/mmc/host.h>

#include <asm/atmel-mci.h>
#include <asm/io.h>
#include <asm/unaligned.h>

#include <mach/board.h>

#include "atmel-mci-regs.h"

#define ATMCI_DATA_ERROR_FLAGS	(MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE)

enum {
	EVENT_CMD_COMPLETE = 0,
	EVENT_XFER_COMPLETE,
	EVENT_DATA_COMPLETE,
	EVENT_DATA_ERROR,
};

enum atmel_mci_state {
	STATE_SENDING_CMD = 0,
	STATE_SENDING_DATA,
	STATE_DATA_BUSY,
	STATE_SENDING_STOP,
	STATE_DATA_ERROR,
};

struct atmel_mci {
	struct mmc_host		*mmc;
	void __iomem		*regs;

	struct scatterlist	*sg;
	unsigned int		pio_offset;

	struct mmc_request	*mrq;
	struct mmc_command	*cmd;
	struct mmc_data		*data;

	u32			cmd_status;
	u32			data_status;
	u32			stop_cmdr;

	u32			mode_reg;
	u32			sdc_reg;

	struct tasklet_struct	tasklet;
	unsigned long		pending_events;
	unsigned long		completed_events;
	enum atmel_mci_state	state;

	int			present;
	int			detect_pin;
	int			wp_pin;

	/* For detect pin debouncing */
	struct timer_list	detect_timer;

	unsigned long		bus_hz;
	unsigned long		mapbase;
	struct clk		*mck;
	struct platform_device	*pdev;
};

#define atmci_test_and_clear_pending(host, event)		\
	test_and_clear_bit(event, &host->pending_events)
#define atmci_set_completed(host, event)			\
	set_bit(event, &host->completed_events)
#define atmci_set_pending(host, event)				\
	set_bit(event, &host->pending_events)

/*
 * The debugfs stuff below is mostly optimized away when
 * CONFIG_DEBUG_FS is not set.
 */
static int atmci_req_show(struct seq_file *s, void *v)
{
	struct atmel_mci	*host = s->private;
	struct mmc_request	*mrq = host->mrq;
	struct mmc_command	*cmd;
	struct mmc_command	*stop;
	struct mmc_data		*data;

	/* Make sure we get a consistent snapshot */
	spin_lock_irq(&host->mmc->lock);

	if (mrq) {
		cmd = mrq->cmd;
		data = mrq->data;
		stop = mrq->stop;

		if (cmd)
			seq_printf(s,
				"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
				cmd->opcode, cmd->arg, cmd->flags,
				cmd->resp[0], cmd->resp[1], cmd->resp[2],
				cmd->resp[2], cmd->error);
		if (data)
			seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
				data->bytes_xfered, data->blocks,
				data->blksz, data->flags, data->error);
		if (stop)
			seq_printf(s,
				"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
				stop->