/*
 * Broadcom specific AMBA
 * Core ops
 *
 * 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_core_wait_value(struct bcma_device *core, u16 reg, u32 mask,
                                 u32 value, int timeout)
{
        unsigned long deadline = jiffies + timeout;
        u32 val;

        do {
                val = bcma_aread32(core, reg);
                if ((val & mask) == value)
                        return true;
                cpu_relax();
                udelay(10);
        } while (!time_after_eq(jiffies, deadline));

        bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);

        return false;
}

bool bcma_core_is_enabled(struct bcma_device *core)
{
        if ((bcma_aread32(core, BCMA_IOCTL) & (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC))
            != BCMA_IOCTL_CLK)
                return false;
        if (bcma_aread32(core, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
                return false;
        return true;
}
EXPORT_SYMBOL_GPL(bcma_core_is_enabled);

void bcma_core_disable(struct bcma_device *core, u32 flags)
{
        if (bcma_aread32(core, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
                return;

        bcma_core_wait_value(core, BCMA_RESET_ST, ~0, 0, 300);

        bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
        bcma_aread32(core, BCMA_RESET_CTL);
        udelay(1);

        bcma_awrite32(core, BCMA_IOCTL, flags);
        bcma_aread32(core, BCMA_IOCTL);
        udelay(10);
}
EXPORT_SYMBOL_GPL(bcma_core_disable);

int bcma_core_enable(struct bcma_device *core, u32 flags)
{
        bcma_core_disable(core, flags);

        bcma_awrite32(core, BCMA_IOCTL, (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC | flags));
        bcma_aread32(core, BCMA_IOCTL);

        bcma_awrite32(core, BCMA_RESET_CTL, 0);
        bcma_aread32(core, BCMA_RESET_CTL);
        udelay(1);

        bcma_awrite32(core, BCMA_IOCTL, (BCMA_IOCTL_CLK | flags));
        bcma_aread32(core, BCMA_IOCTL);
        udelay(1);

        return 0;
}
EXPORT_SYMBOL_GPL(bcma_core_enable);

void bcma_core_set_clockmode(struct bcma_device *core,
                             enum bcma_clkmode clkmode)
{
        u16 i;

        WARN_ON(core->id.id != BCMA_CORE_CHIPCOMMON &&
                core->id.id != BCMA_CORE_PCIE &&
                core->id.id != BCMA_CORE_80211);

        switch (clkmode) {
        case BCMA_CLKMODE_FAST:
                bcma_set32(core, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT);
                usleep_range(64, 300);
                for (i = 0; i < 1500; i++) {
                        if (bcma_read32(core, BCMA_CLKCTLST) &
                            BCMA_CLKCTLST_HAVEHT) {
                                i = 0;
                                break;
                        }
                        udelay(10);
                }
                if (i)
                        bcma_err(core->bus, "HT force timeout\n");
                break;
        case BCMA_CLKMODE_DYNAMIC:
                bcma_set32(core, BCMA_CLKCTLST, ~BCMA_CLKCTLST_FORCEHT);
                break;
        }
}
EXPORT_SYMBOL_GPL(bcma_core_set_clockmode);

void bcma_core_pll_ctl(struct bcma_device *core, u32 req, u32 status, bool on)
{
        u16 i;

        WARN_ON(req & ~BCMA_CLKCTLST_EXTRESREQ);
        WARN_ON(status & ~BCMA_CLKCTLST_EXTRESST);

        if (on) {
                bcma_set32(core, BCMA_CLKCTLST, req);
                for (i = 0; i < 10000; i++) {
                        if ((bcma_read32(core, BCMA_CLKCTLST) & status) ==
                            status) {
                                i = 0;
                                break;
                        }
                        udelay(10);
                }
                if (i)
                        bcma_err(core->bus, "PLL enable timeout\n");
        } else {
                /*
                 * Mask the PLL but don't wait for it to be disabled. PLL may be
                 * shared between cores and will be still up if there is another
                 * core using it.
                 */
                bcma_mask32(core, BCMA_CLKCTLST, ~req);
                bcma_read32(core, BCMA_CLKCTLST);
        }
}
EXPORT_SYMBOL_GPL(bcma_core_pll_ctl);

u32 bcma_core_dma_translation(struct bcma_device *core)
{
        switch (core->bus->hosttype) {
        case BCMA_HOSTTYPE_SOC:
                return 0;
        case BCMA_HOSTTYPE_PCI:
                if (bcma_aread32(core, BCMA_IOST) & BCMA_IOST_DMA64)
                        return BCMA_DMA_TRANSLATION_DMA64_CMT;
                else
                        return BCMA_DMA_TRANSLATION_DMA32_CMT;
        default:
                bcma_err(core->bus, "DMA translation unknown for host %d\n",
                         core->bus->hosttype);
        }
        return BCMA_DMA_TRANSLATION_NONE;
}
EXPORT_SYMBOL(bcma_core_dma_translation);