linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 *

 * Toshiba T7L66XB core mfd support

 *

 * Copyright (c) 2005, 2007, 2008 Ian Molton

 * Copyright (c) 2008 Dmitry Baryshkov

 *

 * T7L66 features:

 *

 * Supported in this driver:

 * SD/MMC

 * SM/NAND flash controller

 *

 * As yet not supported

 * GPIO interface (on NAND pins)

 * Serial interface

 * TFT 'interface converter'

 * PCMCIA interface logic

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/slab.h>

#include <linux/irq.h>

#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/mfd/core.h>

#include <linux/mfd/tmio.h>

#include <linux/mfd/t7l66xb.h>

​

enum {

    T7L66XB_CELL_NAND,

    T7L66XB_CELL_MMC,

};

​

static const struct resource t7l66xb_mmc_resources[] = {

    {

        .start = 0x800,

        .end    = 0x9ff,

        .flags = IORESOURCE_MEM,

    },

    {

        .start = IRQ_T7L66XB_MMC,

        .end    = IRQ_T7L66XB_MMC,

        .flags = IORESOURCE_IRQ,

    },

};

​

#define SCR_REVID   0x08        /* b Revision ID    */

#define SCR_IMR     0x42        /* b Interrupt Mask */

#define SCR_DEV_CTL 0xe0        /* b Device control */

#define SCR_ISR     0xe1        /* b Interrupt Status   */

#define SCR_GPO_OC  0xf0        /* b GPO output control */

#define SCR_GPO_OS  0xf1        /* b GPO output enable  */

#define SCR_GPI_S   0xf2        /* w GPI status     */

#define SCR_APDC    0xf8        /* b Active pullup down ctrl */

​

#define SCR_DEV_CTL_USB     BIT(0)  /* USB enable       */

#define SCR_DEV_CTL_MMC     BIT(1)  /* MMC enable       */

​

/*--------------------------------------------------------------------------*/

​

struct t7l66xb {

    void __iomem        *scr;

    /* Lock to protect registers requiring read/modify/write ops. */

    raw_spinlock_t      lock;

​

    struct resource     rscr;

    struct clk      *clk48m;

    struct clk      *clk32k;

    int         irq;

    int         irq_base;

};

​

/*--------------------------------------------------------------------------*/

​

static int t7l66xb_mmc_enable(struct platform_device *mmc)

{

    struct t7l66xb *t7l66xb = dev_get_drvdata(mmc->dev.parent);

    unsigned long flags;

    u8 dev_ctl;

    int ret;

​

    ret = clk_prepare_enable(t7l66xb->clk32k);

    if (ret)

        return ret;

​

    raw_spin_lock_irqsave(&t7l66xb->lock, flags);

​