xref: /openbmc/linux/drivers/mmc/host/tmio_mmc.h (revision b6147490)

/*
 * linux/drivers/mmc/host/tmio_mmc.h
 *
 * Copyright (C) 2007 Ian Molton
 * Copyright (C) 2004 Ian Molton
 *
 * 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.
 *
 * Driver for the MMC / SD / SDIO cell found in:
 *
 * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
 */

#ifndef TMIO_MMC_H
#define TMIO_MMC_H

#include <linux/highmem.h>
#include <linux/pagemap.h>

/* Definitions for values the CTRL_STATUS register can take. */
#define TMIO_STAT_CMDRESPEND    0x00000001
#define TMIO_STAT_DATAEND       0x00000004
#define TMIO_STAT_CARD_REMOVE   0x00000008
#define TMIO_STAT_CARD_INSERT   0x00000010
#define TMIO_STAT_SIGSTATE      0x00000020
#define TMIO_STAT_WRPROTECT     0x00000080
#define TMIO_STAT_CARD_REMOVE_A 0x00000100
#define TMIO_STAT_CARD_INSERT_A 0x00000200
#define TMIO_STAT_SIGSTATE_A    0x00000400
#define TMIO_STAT_CMD_IDX_ERR   0x00010000
#define TMIO_STAT_CRCFAIL       0x00020000
#define TMIO_STAT_STOPBIT_ERR   0x00040000
#define TMIO_STAT_DATATIMEOUT   0x00080000
#define TMIO_STAT_RXOVERFLOW    0x00100000
#define TMIO_STAT_TXUNDERRUN    0x00200000
#define TMIO_STAT_CMDTIMEOUT    0x00400000
#define TMIO_STAT_RXRDY         0x01000000
#define TMIO_STAT_TXRQ          0x02000000
#define TMIO_STAT_ILL_FUNC      0x20000000
#define TMIO_STAT_CMD_BUSY      0x40000000
#define TMIO_STAT_ILL_ACCESS    0x80000000

/* Definitions for values the CTRL_SDIO_STATUS register can take. */
#define TMIO_SDIO_STAT_IOIRQ		0x0001
#define TMIO_SDIO_STAT_EXPUB52	0x4000
#define TMIO_SDIO_STAT_EXWT		0x8000
#define TMIO_SDIO_MASK_ALL		0xc007

/* Define some IRQ masks */
/* This is the mask used at reset by the chip */
#define TMIO_MASK_ALL           0x837f031d
#define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
#define TMIO_MASK_CMD     (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
		TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
#define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)

struct tmio_mmc_data;

struct tmio_mmc_host {
	void __iomem *ctl;
	unsigned long bus_shift;
	struct mmc_command      *cmd;
	struct mmc_request      *mrq;
	struct mmc_data         *data;
	struct mmc_host         *mmc;
	int                     irq;
	unsigned int		sdio_irq_enabled;

	/* Callbacks for clock / power control */
	void (*set_pwr)(struct platform_device *host, int state);
	void (*set_clk_div)(struct platform_device *host, int state);

	/* pio related stuff */
	struct scatterlist      *sg_ptr;
	struct scatterlist      *sg_orig;
	unsigned int            sg_len;
	unsigned int            sg_off;

	struct platform_device *pdev;
	struct tmio_mmc_data *pdata;

	/* DMA support */
	bool			force_pio;
	struct dma_chan		*chan_rx;
	struct dma_chan		*chan_tx;
	struct tasklet_struct	dma_complete;
	struct tasklet_struct	dma_issue;
	struct scatterlist	bounce_sg;
	u8			*bounce_buf;

	/* Track lost interrupts */
	struct delayed_work	delayed_reset_work;
	spinlock_t		lock;
	unsigned long		last_req_ts;
};

int tmio_mmc_host_probe(struct tmio_mmc_host **host,
			struct platform_device *pdev,
			struct tmio_mmc_data *pdata);
void tmio_mmc_host_remove(struct tmio_mmc_host *host);
void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);

void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);

static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
					 unsigned long *flags)
{
	local_irq_save(*flags);
	return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
}

static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
					  unsigned long *flags, void *virt)
{
	kunmap_atomic(virt - sg->offset, KM_BIO_SRC_IRQ);
	local_irq_restore(*flags);
}

#ifdef CONFIG_TMIO_MMC_DMA
void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
void tmio_mmc_release_dma(struct tmio_mmc_host *host);
#else
static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
			       struct mmc_data *data)
{
}

static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
				 struct tmio_mmc_data *pdata)
{
	host->chan_tx = NULL;
	host->chan_rx = NULL;
}

static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
{
}
#endif

#endif