/*
 * Broadcom specific AMBA
 * ChipCommon B Unit driver
 *
 * Copyright 2014, Hauke Mehrtens <hauke@hauke-m.de>
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "bcma_private.h"
#include <linux/export.h>
#include <linux/bcma/bcma.h>

static bool bcma_wait_reg(struct bcma_bus *bus, void __iomem *addr, u32 mask,
                          u32 value, int timeout)
{
        unsigned long deadline = jiffies + timeout;
        u32 val;

        do {
                val = readl(addr);
                if ((val & mask) == value)
                        return true;
                cpu_relax();
                udelay(10);
        } while (!time_after_eq(jiffies, deadline));

        bcma_err(bus, "Timeout waiting for register %p\n", addr);

        return false;
}

void bcma_chipco_b_mii_write(struct bcma_drv_cc_b *ccb, u32 offset, u32 value)
{
        struct bcma_bus *bus = ccb->core->bus;
        void __iomem *mii = ccb->mii;

        writel(offset, mii + BCMA_CCB_MII_MNG_CTL);
        bcma_wait_reg(bus, mii + BCMA_CCB_MII_MNG_CTL, 0x0100, 0x0000, 100);
        writel(value, mii + BCMA_CCB_MII_MNG_CMD_DATA);
        bcma_wait_reg(bus, mii + BCMA_CCB_MII_MNG_CTL, 0x0100, 0x0000, 100);
}
EXPORT_SYMBOL_GPL(bcma_chipco_b_mii_write);

int bcma_core_chipcommon_b_init(struct bcma_drv_cc_b *ccb)
{
        if (ccb->setup_done)
                return 0;

        ccb->setup_done = 1;
        ccb->mii = ioremap(ccb->core->addr_s[1], BCMA_CORE_SIZE);
        if (!ccb->mii)
                return -ENOMEM;

        return 0;
}

void bcma_core_chipcommon_b_free(struct bcma_drv_cc_b *ccb)
{
        if (ccb->mii)
                iounmap(ccb->mii);
}