path: root/drivers/mmc/host/sdhci-pci.c

/*  linux/drivers/mmc/host/sdhci-pci.c - SDHCI on PCI bus interface
 *
 *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * Thanks to the following companies for their support:
 *
 *     - JMicron (hardware and technical support)
 */

#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/device.h>

#include <linux/mmc/host.h>

#include <asm/scatterlist.h>
#include <asm/io.h>

#include "sdhci.h"

/*
 * PCI registers
 */

#define PCI_SDHCI_IFPIO			0x00
#define PCI_SDHCI_IFDMA			0x01
#define PCI_SDHCI_IFVENDOR		0x02

#define PCI_SLOT_INFO			0x40	/* 8 bits */
#define  PCI_SLOT_INFO_SLOTS(x)		((x >> 4) & 7)
#define  PCI_SLOT_INFO_FIRST_BAR_MASK	0x07

#define MAX_SLOTS			8

struct sdhci_pci_chip;
struct sdhci_pci_slot;

struct sdhci_pci_fixes {
	unsigned int		quirks;

	int			(*probe)(struct sdhci_pci_chip*);

	int			(*probe_slot)(struct sdhci_pci_slot*);
	void			(*remove_slot)(struct sdhci_pci_slot*, int);

	int			(*suspend)(struct sdhci_pci_chip*,
					pm_message_t);
	int			(*resume)(struct sdhci_pci_chip*);
};

struct sdhci_pci_slot {
	struct sdhci_pci_chip	*chip;
	struct sdhci_host	*host;

	int			pci_bar;
};

struct sdhci_pci_chip {
	struct pci_dev		*pdev;

	unsigned int		quirks;
	const struct sdhci_pci_fixes *fixes;

	int			num_slots;	/* Slots on controller */
	struct sdhci_pci_slot	*slots[MAX_SLOTS]; /* Pointers to host slots */
};


/*****************************************************************************\
 *                                                                           *
 * Hardware specific quirk handling                                          *
 *                                                                           *
\*****************************************************************************/

static int ricoh_probe(struct sdhci_pci_chip *chip)
{
	if (chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG ||
	    chip->pdev->subsystem_vendor == PCI_VENDOR_ID_SONY)
		chip->quirks |= SDHCI_QUIRK_NO_CARD_NO_RESET;
	return 0;
}

static int ricoh_mmc_probe_slot(struct sdhci_pci_slot *slot)
{
	slot->host->caps =
		((0x21 << SDHCI_TIMEOUT_CLK_SHIFT)
			& SDHCI_TIMEOUT_CLK_MASK) |

		((0x21 << SDHCI_CLOCK_BASE_SHIFT)
			& SDHCI_CLOCK_BASE_MASK) |

		SDHCI_TIMEOUT_CLK_UNIT |
		SDHCI_CAN_VDD_330 |
		SDHCI_CAN_DO_SDMA;
	return 0;
}

static int ricoh_mmc_resume(struct sdhci_pci_chip *chip)
{
	/* Apply a delay to allow controller to settle */
	/* Otherwise it becomes confused if card state changed
		during suspend */
	msleep(500);
	return 0;
}

static const struct sdhci_pci_fixes sdhci_ricoh = {
	.probe		= ricoh_probe,
	.quirks		= SDHCI_QUIRK_32BIT_DMA_ADDR |
			  SDHCI_QUIRK_FORCE_DMA |
			  SDHCI_QUIRK_CLOCK_BEFORE_RESET,
};

static const struct sdhci_pci_fixes sdhci_ricoh_mmc = {
	.probe_slot	= ricoh_mmc_probe_slot,
	.resume		= ricoh_mmc_resume,
	.quirks		= SDHCI_QUIRK_32BIT_DMA_ADDR |
			  SDHCI_QUIRK_CLOCK_BEFORE_RESET |
			  SDHCI_QUIRK_NO_CARD_NO_RESET |
			  SDHCI_QUIRK_MISSING_CAPS
};

static const struct sdhci_pci_fixes sdhci_ene_712 = {
	.quirks		= SDHCI_QUIRK_SINGLE_POWER_WRITE |
			  SDHCI_QUIRK_BROKEN_DMA,
};

static const struct sdhci_pci_fixes sdhci_ene_714 = {
	.quirks		= SDHCI_QUIRK_SINGLE_POWER_WRITE |
			  SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS |
			  SDHCI_QUIRK_BROKEN_DMA,
};

static const struct sdhci_pci_fixes sdhci_cafe = {
	.quirks		= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
			  SDHCI_QUIRK_NO_BUSY_IRQ |
			  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL,
};

/*
 * ADMA operation is disabled for Moorestown platform due to
 * hardware bugs.
 */
static int mrst_hc1_probe(struct sdhci_pci_chip *chip)
{
	/*
	 * slots number is fixed here for MRST as SDIO3 is never used and has
	 * hardware bugs.
	 */
	chip->num_slots = 1;
	return 0;
}

static const struct sdhci_pci_fixes sdhci_intel_mrst_hc0 = {
	.quirks		= SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_NO_HISPD_BIT,
};

static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1 = {
	.quirks		= SDHCI_QUIRK_BROKEN_ADMA | SDHCI_QUIRK_NO_HISPD_BIT,
	.probe		= mrst_hc1_probe,
};

static const struct sdhci_pci_fixes sdhci_intel_mfd_sd = {
	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
};

static const struct sdhci_pci_fixes sdhci_intel_mfd_emmc_sdio = {
	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
};

static int jmicron_pmos(struct sdhci_pci_chip *chip, int on)
{
	u8 scratch;
	int ret;

	ret = pci_read_config_byte(chip->pdev, 0xAE, &scratch);
	if (ret)
		return ret;

	/*
	 * Turn PMOS on [bit 0], set over current detection to 2.4 V
	 * [bit 1:2] and enable over current debouncing [bit 6].
	 */
	if (on)
		scratch |= 0x47;
	else
		scratch &= ~0x47;

	ret = pci_write_config_byte(chip->pdev, 0xAE, scratch);
	if (ret)
		return