// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/mfd/mcp-sa11x0.c
 *
 *  Copyright (C) 2001-2005 Russell King
 *
 *  SA11x0 MCP (Multimedia Communications Port) driver.
 *
 *  MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
 */
#include <linux/module.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/mfd/mcp.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <linux/platform_data/mfd-mcp-sa11x0.h>

#define DRIVER_NAME "sa11x0-mcp"

struct mcp_sa11x0 {
        void __iomem    *base0;
        void __iomem    *base1;
        u32             mccr0;
        u32             mccr1;
};

/* Register offsets */
#define MCCR0(m)        ((m)->base0 + 0x00)
#define MCDR0(m)        ((m)->base0 + 0x08)
#define MCDR1(m)        ((m)->base0 + 0x0c)
#define MCDR2(m)        ((m)->base0 + 0x10)
#define MCSR(m)         ((m)->base0 + 0x18)
#define MCCR1(m)        ((m)->base1 + 0x00)

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

static void
mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
{
        struct mcp_sa11x0 *m = priv(mcp);

        divisor /= 32;

        m->mccr0 &= ~0x00007f00;
        m->mccr0 |= divisor << 8;
        writel_relaxed(m->mccr0, MCCR0(m));
}

static void
mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
{
        struct mcp_sa11x0 *m = priv(mcp);

        divisor /= 32;

        m->mccr0 &= ~0x0000007f;
        m->mccr0 |= divisor;
        writel_relaxed(m->mccr0, MCCR0(m));
}

/*
 * 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)
{
        struct mcp_sa11x0 *m = priv(mcp);
        int ret = -ETIME;
        int i;

        writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));

        for (i = 0; i < 2; i++) {
                udelay(mcp->rw_timeout);
                if (readl_relaxed(MCSR(m)) & 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)
{
        struct mcp_sa11x0 *m = priv(mcp);
        int ret = -ETIME;
        int i;

        writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));

        for (i = 0; i < 2; i++) {
                udelay(mcp->rw_timeout);
                if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
                        ret = readl_relaxed(MCDR2(m)) & 0xffff;
                        break;
                }
        }

        if (ret < 0)
                printk(KERN_WARNING "mcp: read timed out\n");

        return ret;
}

static void mcp_sa11x0_enable(struct mcp *mcp)
{
        struct mcp_sa11x0 *m = priv(mcp);

        writel(-1, MCSR(m));
        m->mccr0 |= MCCR0_MCE;
        writel_relaxed(m->mccr0, MCCR0(m));
}

static void mcp_sa11x0_disable(struct mcp *mcp)
{
        struct mcp_sa11x0 *m = priv(mcp);

        m->mccr0 &= ~MCCR0_MCE;
        writel_relaxed(m->mccr0, MCCR0(m));
}

/*
 * 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 *dev)
{
        struct mcp_plat_data *data = dev_get_platdata(&dev->dev);
        struct resource *mem0, *mem1;
        struct mcp_sa11x0 *m;
        struct mcp *mcp;
        int ret;

        if (!data)
                return -ENODEV;

        mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
        mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
        if (!mem0 || !mem1)
                return -ENXIO;

        if (!request_mem_region(mem0->start, resource_size(mem0),
                                DRIVER_NAME)) {
                ret = -EBUSY;
                goto err_mem0;
        }

        if (!request_mem_region(mem1->start, resource_size(mem1),
                                DRIVER_NAME)) {
                ret = -EBUSY;
                goto err_mem1;
        }

        mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
        if (!mcp) {
                ret = -ENOMEM;
                goto err_alloc;
        }

        mcp->owner              = THIS_MODULE;
        mcp->ops                = &mcp_sa11x0;
        mcp->sclk_rate          = data->sclk_rate;

        m = priv(mcp);
        m->mccr0 = data->mccr0 | 0x7f7f;
        m->mccr1 = data->mccr1;

        m->base0 = ioremap(mem0->start, resource_size(mem0));
        m->base1 = ioremap(mem1->start, resource_size(mem1));
        if (!m->base0 || !m->base1) {
                ret = -ENOMEM;
                goto err_ioremap;
        }

        platform_set_drvdata(dev, mcp);

        /*
         * Initialise device.  Note that we initially
         * set the sampling rate to minimum.
         */
        writel_relaxed(-1, MCSR(m));
        writel_relaxed(m->mccr1, MCCR1(m));
        writel_relaxed(m->mccr0, MCCR0(m));

        /*
         * 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 = DIV_ROUND_UP(64 * 3 * 1000000, mcp->sclk_rate);

        ret = mcp_host_add(mcp, data->codec_pdata);
        if (ret == 0)
                return 0;

 err_ioremap:
        iounmap(m->base1);
        iounmap(m->base0);
        mcp_host_free(mcp);
 err_alloc:
        release_mem_region(mem1->start, resource_size(mem1));
 err_mem1:
        release_mem_region(mem0->start, resource_size(mem0));
 err_mem0:
        return ret;
}

static void mcp_sa11x0_remove(struct platform_device *dev)
{
        struct mcp *mcp = platform_get_drvdata(dev);
        struct mcp_sa11x0 *m = priv(mcp);
        struct resource *mem0, *mem1;

        if (m->mccr0 & MCCR0_MCE)
                dev_warn(&dev->dev,
                         "device left active (missing disable call?)\n");

        mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
        mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);

        mcp_host_del(mcp);
        iounmap(m->base1);
        iounmap(m->base0);
        mcp_host_free(mcp);
        release_mem_region(mem1->start, resource_size(mem1));
        release_mem_region(mem0->start, resource_size(mem0));
}

static int mcp_sa11x0_suspend(struct device *dev)
{
        struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));

        if (m->mccr0 & MCCR0_MCE)
                dev_warn(dev, "device left active (missing disable call?)\n");

        writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));

        return 0;
}

static int mcp_sa11x0_resume(struct device *dev)
{
        struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));

        writel_relaxed(m->mccr1, MCCR1(m));
        writel_relaxed(m->mccr0, MCCR0(m));

        return 0;
}

static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
        .suspend = mcp_sa11x0_suspend,
        .freeze = mcp_sa11x0_suspend,
        .poweroff = mcp_sa11x0_suspend,
        .resume_noirq = mcp_sa11x0_resume,
        .thaw_noirq = mcp_sa11x0_resume,
        .restore_noirq = mcp_sa11x0_resume,
};

static struct platform_driver mcp_sa11x0_driver = {
        .probe          = mcp_sa11x0_probe,
        .remove         = mcp_sa11x0_remove,
        .driver         = {
                .name   = DRIVER_NAME,
                .pm     = pm_sleep_ptr(&mcp_sa11x0_pm_ops),
        },
};

/*
 * This needs re-working
 */
module_platform_driver(mcp_sa11x0_driver);

MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
MODULE_LICENSE("GPL");