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/*

 *  linux/drivers/mfd/mcp-sa11x0.c

 *

 *  Copyright (C) 2001-2005 Russell King

 *

 * 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.

 *

 *  SA11x0 MCP (Multimedia Communications Port) driver.

 *

 *  MCP read/write timeouts from Jordi Colomer, rehacked by rmk.

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/spinlock.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <asm/dma.h>

#include <asm/hardware.h>

#include <asm/mach-types.h>

#include <asm/system.h>

#include <asm/arch/mcp.h>

#include <asm/arch/assabet.h>

#include "mcp.h"

struct mcp_sa11x0 {

        u32     mccr0;

        u32     mccr1;

};

#define priv(mcp)       ((struct mcp_sa11x0 *)mcp_priv(mcp))

static void

mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)

{

        unsigned int mccr0;

        divisor /= 32;

        mccr0 = Ser4MCCR0 & ~0x00007f00;

        mccr0 |= divisor << 8;

        Ser4MCCR0 = mccr0;

}

static void

mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)

{

        unsigned int mccr0;

        divisor /= 32;

        mccr0 = Ser4MCCR0 & ~0x0000007f;

        mccr0 |= divisor;

        Ser4MCCR0 = mccr0;

}

/*

 * Write data to the device.  The bit should be set after 3 subframe

 * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.

 * We really should try doing something more productive while we

 * wait.

 */

static void

mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)

{

        int ret = -ETIME;

        int i;

        Ser4MCDR2 = reg << 17 | MCDR2_Wr | (val & 0xffff);

        for (i = 0; i < 2; i++) {

                udelay(mcp->rw_timeout);

                if (Ser4MCSR & MCSR_CWC) {

                        ret = 0;

                        break;

                }

        }

        if (ret < 0)

                printk(KERN_WARNING "mcp: write timed out\n");

}

/*

 * Read data from the device.  The bit should be set after 3 subframe

 * times (each frame is 64 clocks).  We wait a maximum of 6 subframes.

 * We really should try doing something more productive while we

 * wait.

 */

static unsigned int

mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)

{

        int ret = -ETIME;

        int i;

        Ser4MCDR2 = reg << 17 | MCDR2_Rd;

        for (i = 0; i < 2; i++) {

                udelay(mcp->rw_timeout);

                if (Ser4MCSR & MCSR_CRC) {

                        ret = Ser4MCDR2 & 0xffff;

                        break;

                }

        }

        if (ret < 0)

                printk(KERN_WARNING "mcp: read timed out\n");

        return ret;

}

static void mcp_sa11x0_enable(struct mcp *mcp)

{

        Ser4MCSR = -1;

        Ser4MCCR0 |= MCCR0_MCE;

}

static void mcp_sa11x0_disable(struct mcp *mcp)

{

        Ser4MCCR0 &= ~MCCR0_MCE;

}

/*

 * Our methods.

 */

static struct mcp_ops mcp_sa11x0 = {

        .set_telecom_divisor    = mcp_sa11x0_set_telecom_divisor,

        .set_audio_divisor      = mcp_sa11x0_set_audio_divisor,

        .reg_write              = mcp_sa11x0_write,

        .reg_read               = mcp_sa11x0_read,

        .enable                 = mcp_sa11x0_enable,

        .disable                = mcp_sa11x0_disable,

};

static int mcp_sa11x0_probe(struct platform_device *pdev)

{

        struct mcp_plat_data *data = pdev->dev.platform_data;

        struct mcp *mcp;

        int ret;

        if (!data)

                return -ENODEV;

        if (!request_mem_region(0x80060000, 0x60, "sa11x0-mcp"))

                return -EBUSY;

        mcp = mcp_host_alloc(&pdev->dev, sizeof(struct mcp_sa11x0));

        if (!mcp) {

                ret = -ENOMEM;

                goto release;

        }

        mcp->owner              = THIS_MODULE;

        mcp->ops                = &mcp_sa11x0;

        mcp->sclk_rate          = data->sclk_rate;

        mcp->dma_audio_rd       = DMA_Ser4MCP0Rd;

        mcp->dma_audio_wr       = DMA_Ser4MCP0Wr;

        mcp->dma_telco_rd       = DMA_Ser4MCP1Rd;

        mcp->dma_telco_wr       = DMA_Ser4MCP1Wr;

        platform_set_drvdata(pdev, mcp);

        if (machine_is_assabet()) {

                ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);

        }

        /*

         * Setup the PPC unit correctly.

         */

        PPDR &= ~PPC_RXD4;

        PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;

        PSDR |= PPC_RXD4;

        PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);

        PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);

        /*

         * Initialise device.  Note that we initially

         * set the sampling rate to minimum.

         */

        Ser4MCSR = -1;

        Ser4MCCR1 = data->mccr1;

        Ser4MCCR0 = data->mccr0 | 0x7f7f;

        /*

         * Calculate the read/write timeout (us) from the bit clock

         * rate.  This is the period for 3 64-bit frames.  Always

         * round this time up.

         */

        mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /

                          mcp->sclk_rate;

        ret = mcp_host_register(mcp);

        if (ret == 0)

                goto out;

 release:

        release_mem_region(0x80060000, 0x60);

        platform_set_drvdata(pdev, NULL);

 out:

        return ret;

}

static int mcp_sa11x0_remove(struct platform_device *dev)

{

        struct mcp *mcp = platform_get_drvdata(dev);

        platform_set_drvdata(dev, NULL);

        mcp_host_unregister(mcp);

        release_mem_region(0x80060000, 0x60);

        return 0;

}

static int mcp_sa11x0_suspend(struct platform_device *dev, pm_message_t state)

{

        struct mcp *mcp = platform_get_drvdata(dev);

        priv(mcp)->mccr0 = Ser4MCCR0;

        priv(mcp)->mccr1 = Ser4MCCR1;

        Ser4MCCR0 &= ~MCCR0_MCE;

        return 0;

}

static int mcp_sa11x0_resume(struct platform_device *dev)

{

        struct mcp *mcp = platform_get_drvdata(dev);

        Ser4MCCR1 = priv(mcp)->mccr1;

        Ser4MCCR0 = priv(mcp)->mccr0;

        return 0;

}

/*

 * The driver for the SA11x0 MCP port.

 */

static struct platform_driver mcp_sa11x0_driver = {

        .probe          = mcp_sa11x0_probe,

        .remove         = mcp_sa11x0_remove,

        .suspend        = mcp_sa11x0_suspend,

        .resume         = mcp_sa11x0_resume,

        .driver         = {

                .name   = "sa11x0-mcp",

        },

};

/*

 * This needs re-working

 */

static int __init mcp_sa11x0_init(void)

{

        return platform_driver_register(&mcp_sa11x0_driver);

}

static void __exit mcp_sa11x0_exit(void)

{

        platform_driver_unregister(&mcp_sa11x0_driver);

}

module_init(mcp_sa11x0_init);

module_exit(mcp_sa11x0_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");

MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");

MODULE_LICENSE("GPL");