// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2003 Deep Blue Solutions Ltd
 */
#include <linux/kernel.h>
#include <linux/amba/mmci.h>
#include <linux/io.h>
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/sched_clock.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "integrator-hardware.h"
#include "integrator-cm.h"
#include "integrator.h"

/* Base address to the core module header */
static struct regmap *cm_map;
/* Base address to the CP controller */
static void __iomem *intcp_con_base;

#define CM_COUNTER_OFFSET 0x28

/*
 * Logical      Physical
 * f1400000     14000000        Interrupt controller
 * f1600000     16000000        UART 0
 * fca00000     ca000000        SIC
 */

static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
        {
                .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
                .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
                .length         = SZ_4K,
                .type           = MT_DEVICE
        }, {
                .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
                .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
                .length         = SZ_4K,
                .type           = MT_DEVICE
        }, {
                .virtual        = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
                .pfn            = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
                .length         = SZ_4K,
                .type           = MT_DEVICE
        }
};

static void __init intcp_map_io(void)
{
        iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
}

/*
 * It seems that the card insertion interrupt remains active after
 * we've acknowledged it.  We therefore ignore the interrupt, and
 * rely on reading it from the SIC.  This also means that we must
 * clear the latched interrupt.
 */
static unsigned int mmc_status(struct device *dev)
{
        unsigned int status = readl(__io_address(0xca000000 + 4));
        writel(8, intcp_con_base + 8);

        return status & 8;
}

static struct mmci_platform_data mmc_data = {
        .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
        .status         = mmc_status,
};

static u64 notrace intcp_read_sched_clock(void)
{
        unsigned int val;

        /* MMIO so discard return code */
        regmap_read(cm_map, CM_COUNTER_OFFSET, &val);
        return val;
}

static void __init intcp_init_early(void)
{
        cm_map = syscon_regmap_lookup_by_compatible("arm,core-module-integrator");
        if (IS_ERR(cm_map))
                return;
        sched_clock_register(intcp_read_sched_clock, 32, 24000000);
}

static void __init intcp_init_irq_of(void)
{
        cm_init();
        irqchip_init();
}

/*
 * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
 * and enforce the bus names since these are used for clock lookups.
 */
static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
        OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
                "mmci", &mmc_data),
        { /* sentinel */ },
};

static const struct of_device_id intcp_syscon_match[] = {
        { .compatible = "arm,integrator-cp-syscon"},
        { },
};

static void __init intcp_init_of(void)
{
        struct device_node *cpcon;

        cpcon = of_find_matching_node(NULL, intcp_syscon_match);
        if (!cpcon)
                return;

        intcp_con_base = of_iomap(cpcon, 0);
        if (!intcp_con_base)
                return;

        of_platform_default_populate(NULL, intcp_auxdata_lookup, NULL);
}

static const char * intcp_dt_board_compat[] = {
        "arm,integrator-cp",
        NULL,
};

DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
        .reserve        = integrator_reserve,
        .map_io         = intcp_map_io,
        .init_early     = intcp_init_early,
        .init_irq       = intcp_init_irq_of,
        .init_machine   = intcp_init_of,
        .dt_compat      = intcp_dt_board_compat,
MACHINE_END