// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Synopsys DesignWare Multimedia Card Interface driver
 *
 * Copyright (C) 2009 NXP Semiconductors
 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
 */

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/of.h>
#include <linux/mfd/altera-sysmgr.h>
#include <linux/regmap.h>

#include "dw_mmc.h"
#include "dw_mmc-pltfm.h"

#define SOCFPGA_DW_MMC_CLK_PHASE_STEP   45
#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \
        ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0))

int dw_mci_pltfm_register(struct platform_device *pdev,
                          const struct dw_mci_drv_data *drv_data)
{
        struct dw_mci *host;
        struct resource *regs;

        host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL);
        if (!host)
                return -ENOMEM;

        host->irq = platform_get_irq(pdev, 0);
        if (host->irq < 0)
                return host->irq;

        host->drv_data = drv_data;
        host->dev = &pdev->dev;
        host->irq_flags = 0;
        host->pdata = pdev->dev.platform_data;

        host->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
        if (IS_ERR(host->regs))
                return PTR_ERR(host->regs);

        /* Get registers' physical base address */
        host->phy_regs = regs->start;

        platform_set_drvdata(pdev, host);
        return dw_mci_probe(host);
}
EXPORT_SYMBOL_GPL(dw_mci_pltfm_register);

const struct dev_pm_ops dw_mci_pltfm_pmops = {
        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
                                pm_runtime_force_resume)
        SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend,
                           dw_mci_runtime_resume,
                           NULL)
};
EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);

static int dw_mci_socfpga_priv_init(struct dw_mci *host)
{
        struct device_node *np = host->dev->of_node;
        struct regmap *sys_mgr_base_addr;
        u32 clk_phase[2] = {0}, reg_offset, reg_shift;
        int i, rc, hs_timing;

        rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0);
        if (rc < 0)
                return 0;

        sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
        if (IS_ERR(sys_mgr_base_addr)) {
                dev_warn(host->dev, "clk-phase-sd-hs was specified, but failed to find altr,sys-mgr regmap!\n");
                return 0;
        }

        of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, &reg_offset);
        of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_shift);

        for (i = 0; i < ARRAY_SIZE(clk_phase); i++)
                clk_phase[i] /= SOCFPGA_DW_MMC_CLK_PHASE_STEP;

        hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1], reg_shift);
        regmap_write(sys_mgr_base_addr, reg_offset, hs_timing);

        return 0;
}

static const struct dw_mci_drv_data socfpga_drv_data = {
        .init           = dw_mci_socfpga_priv_init,
};

static const struct of_device_id dw_mci_pltfm_match[] = {
        { .compatible = "snps,dw-mshc", },
        { .compatible = "altr,socfpga-dw-mshc", .data = &socfpga_drv_data, },
        { .compatible = "img,pistachio-dw-mshc", },
        {},
};
MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);

static int dw_mci_pltfm_probe(struct platform_device *pdev)
{
        const struct dw_mci_drv_data *drv_data = NULL;
        const struct of_device_id *match;

        if (pdev->dev.of_node) {
                match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
                drv_data = match->data;
        }

        return dw_mci_pltfm_register(pdev, drv_data);
}

void dw_mci_pltfm_remove(struct platform_device *pdev)
{
        struct dw_mci *host = platform_get_drvdata(pdev);

        dw_mci_remove(host);
}
EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);

static struct platform_driver dw_mci_pltfm_driver = {
        .probe          = dw_mci_pltfm_probe,
        .remove         = dw_mci_pltfm_remove,
        .driver         = {
                .name           = "dw_mmc",
                .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
                .of_match_table = dw_mci_pltfm_match,
                .pm             = &dw_mci_pltfm_pmops,
        },
};

module_platform_driver(dw_mci_pltfm_driver);

MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
MODULE_AUTHOR("NXP Semiconductor VietNam");
MODULE_AUTHOR("Imagination Technologies Ltd");
MODULE_LICENSE("GPL v2");