/*
 * Copyright (C) 2014 Google, Inc
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <pch.h>
#include <asm/cpu.h>
#include <asm/intel_regs.h>
#include <asm/io.h>
#include <asm/lapic.h>
#include <asm/lpc_common.h>
#include <asm/pci.h>
#include <asm/arch/model_206ax.h>
#include <asm/arch/pch.h>
#include <asm/arch/sandybridge.h>

DECLARE_GLOBAL_DATA_PTR;

#define GPIO_BASE       0x48
#define BIOS_CTRL       0xdc

#ifndef CONFIG_HAVE_FSP
static int pch_revision_id = -1;
static int pch_type = -1;

/**
 * pch_silicon_revision() - Read silicon revision ID from the PCH
 *
 * @dev:        PCH device
 * @return silicon revision ID
 */
static int pch_silicon_revision(struct udevice *dev)
{
        u8 val;

        if (pch_revision_id < 0) {
                dm_pci_read_config8(dev, PCI_REVISION_ID, &val);
                pch_revision_id = val;
        }

        return pch_revision_id;
}

int pch_silicon_type(struct udevice *dev)
{
        u8 val;

        if (pch_type < 0) {
                dm_pci_read_config8(dev, PCI_DEVICE_ID + 1, &val);
                pch_type = val;
        }

        return pch_type;
}

/**
 * pch_silicon_supported() - Check if a certain revision is supported
 *
 * @dev:        PCH device
 * @type:       PCH type
 * @rev:        Minimum required resion
 * @return 0 if not supported, 1 if supported
 */
static int pch_silicon_supported(struct udevice *dev, int type, int rev)
{
        int cur_type = pch_silicon_type(dev);
        int cur_rev = pch_silicon_revision(dev);

        switch (type) {
        case PCH_TYPE_CPT:
                /* CougarPoint minimum revision */
                if (cur_type == PCH_TYPE_CPT && cur_rev >= rev)
                        return 1;
                /* PantherPoint any revision */
                if (cur_type == PCH_TYPE_PPT)
                        return 1;
                break;

        case PCH_TYPE_PPT:
                /* PantherPoint minimum revision */
                if (cur_type == PCH_TYPE_PPT && cur_rev >= rev)
                        return 1;
                break;
        }

        return 0;
}

#define IOBP_RETRY 1000
static inline int iobp_poll(void)
{
        unsigned try = IOBP_RETRY;
        u32 data;

        while (try--) {
                data = readl(RCB_REG(IOBPS));
                if ((data & 1) == 0)
                        return 1;
                udelay(10);
        }

        printf("IOBP timeout\n");
        return 0;
}

void pch_iobp_update(struct udevice *dev, u32 address, u32 andvalue,
                     u32 orvalue)
{
        u32 data;

        /* Set the address */
        writel(address, RCB_REG(IOBPIRI));

        /* READ OPCODE */
        if (pch_silicon_supported(dev, PCH_TYPE_CPT, PCH_STEP_B0))
                writel(IOBPS_RW_BX, RCB_REG(IOBPS));
        else
                writel(IOBPS_READ_AX, RCB_REG(IOBPS));
        if (!iobp_poll())
                return;

        /* Read IOBP data */
        data = readl(RCB_REG(IOBPD));
        if (!iobp_poll())
                return;

        /* Check for successful transaction */
        if ((readl(RCB_REG(IOBPS)) & 0x6) != 0) {
                printf("IOBP read 0x%08x failed\n", address);
                return;
        }

        /* Update the data */
        data &= andvalue;
        data |= orvalue;

        /* WRITE OPCODE */
        if (pch_silicon_supported(dev, PCH_TYPE_CPT, PCH_STEP_B0))
                writel(IOBPS_RW_BX, RCB_REG(IOBPS));
        else
                writel(IOBPS_WRITE_AX, RCB_REG(IOBPS));
        if (!iobp_poll())
                return;

        /* Write IOBP data */
        writel(data, RCB_REG(IOBPD));
        if (!iobp_poll())
                return;
}

static int bd82x6x_probe(struct udevice *dev)
{
        if (!(gd->flags & GD_FLG_RELOC))
                return 0;

        /* Cause the SATA device to do its init */
        uclass_first_device(UCLASS_AHCI, &dev);

        return 0;
}
#endif /* CONFIG_HAVE_FSP */

static int bd82x6x_pch_get_spi_base(struct udevice *dev, ulong *sbasep)
{
        u32 rcba;

        dm_pci_read_config32(dev, PCH_RCBA, &rcba);
        /* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
        rcba = rcba & 0xffffc000;
        *sbasep = rcba + 0x3800;

        return 0;
}

static int bd82x6x_set_spi_protect(struct udevice *dev, bool protect)
{
        return lpc_set_spi_protect(dev, BIOS_CTRL, protect);
}

static int bd82x6x_get_gpio_base(struct udevice *dev, u32 *gbasep)
{
        u32 base;

        /*
         * GPIO_BASE moved to its current offset with ICH6, but prior to
         * that it was unused (or undocumented). Check that it looks
         * okay: not all ones or zeros.
         *
         * Note we don't need check bit0 here, because the Tunnel Creek
         * GPIO base address register bit0 is reserved (read returns 0),
         * while on the Ivybridge the bit0 is used to indicate it is an
         * I/O space.
         */
        dm_pci_read_config32(dev, GPIO_BASE, &base);
        if (base == 0x00000000 || base == 0xffffffff) {
                debug("%s: unexpected BASE value\n", __func__);
                return -ENODEV;
        }

        /*
         * Okay, I guess we're looking at the right device. The actual
         * GPIO registers are in the PCI device's I/O space, starting
         * at the offset that we just read. Bit 0 indicates that it's
         * an I/O address, not a memory address, so mask that off.
         */
        *gbasep = base & 1 ? base & ~3 : base & ~15;

        return 0;
}

static const struct pch_ops bd82x6x_pch_ops = {
        .get_spi_base   = bd82x6x_pch_get_spi_base,
        .set_spi_protect = bd82x6x_set_spi_protect,
        .get_gpio_base  = bd82x6x_get_gpio_base,
};

static const struct udevice_id bd82x6x_ids[] = {
        { .compatible = "intel,bd82x6x" },
        { }
};

U_BOOT_DRIVER(bd82x6x_drv) = {
        .name           = "bd82x6x",
        .id             = UCLASS_PCH,
        .of_match       = bd82x6x_ids,
#ifndef CONFIG_HAVE_FSP
        .probe          = bd82x6x_probe,
#endif
        .ops            = &bd82x6x_pch_ops,
};