// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mach-rpc/riscpc.c
 *
 *  Copyright (C) 1998-2001 Russell King
 *
 *  Architecture specific fixups.
 */
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/serial_8250.h>
#include <linux/ata_platform.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/reboot.h>

#include <asm/elf.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/hardware/iomd.h>
#include <asm/page.h>
#include <asm/domain.h>
#include <asm/setup.h>
#include <asm/system_misc.h>

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

extern void rpc_init_irq(void);

unsigned int vram_size;
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;

static int __init parse_tag_acorn(const struct tag *tag)
{
        memc_ctrl_reg = tag->u.acorn.memc_control_reg;
        number_mfm_drives = tag->u.acorn.adfsdrives;

        switch (tag->u.acorn.vram_pages) {
        case 512:
                vram_size += PAGE_SIZE * 256;
                fallthrough;    /* ??? */
        case 256:
                vram_size += PAGE_SIZE * 256;
                break;
        default:
                break;
        }
#if 0
        if (vram_size) {
                desc->video_start = 0x02000000;
                desc->video_end   = 0x02000000 + vram_size;
        }
#endif
        return 0;
}

__tagtable(ATAG_ACORN, parse_tag_acorn);

static struct map_desc rpc_io_desc[] __initdata = {
        {       /* VRAM         */
                .virtual        =  SCREEN_BASE,
                .pfn            = __phys_to_pfn(SCREEN_START),
                .length         =       2*1048576,
                .type           = MT_DEVICE
        }, {    /* IO space     */
                .virtual        =  (u32)IO_BASE,
                .pfn            = __phys_to_pfn(IO_START),
                .length         =       IO_SIZE  ,
                .type           = MT_DEVICE
        }, {    /* EASI space   */
                .virtual        = (unsigned long)EASI_BASE,
                .pfn            = __phys_to_pfn(EASI_START),
                .length         = EASI_SIZE,
                .type           = MT_DEVICE
        }
};

static void __init rpc_map_io(void)
{
        iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));

        /*
         * Turn off floppy.
         */
        writeb(0xc, PCIO_BASE + (0x3f2 << 2));

        /*
         * RiscPC can't handle half-word loads and stores
         */
        elf_hwcap &= ~HWCAP_HALF;
}

static struct resource acornfb_resources[] = {
        /* VIDC */
        DEFINE_RES_MEM(0x03400000, 0x00200000),
        DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
};

static struct platform_device acornfb_device = {
        .name                   = "acornfb",
        .id                     = -1,
        .dev                    = {
                .coherent_dma_mask = 0xffffffff,
        },
        .num_resources          = ARRAY_SIZE(acornfb_resources),
        .resource               = acornfb_resources,
};

static struct resource iomd_resources[] = {
        DEFINE_RES_MEM(0x03200000, 0x10000),
};

static struct platform_device iomd_device = {
        .name                   = "iomd",
        .id                     = -1,
        .num_resources          = ARRAY_SIZE(iomd_resources),
        .resource               = iomd_resources,
};

static struct resource iomd_kart_resources[] = {
        DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
        DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
};

static struct platform_device kbd_device = {
        .name                   = "kart",
        .id                     = -1,
        .dev                    = {
                .parent         = &iomd_device.dev,
        },
        .num_resources          = ARRAY_SIZE(iomd_kart_resources),
        .resource               = iomd_kart_resources,
};

static struct plat_serial8250_port serial_platform_data[] = {
        {
                .mapbase        = 0x03010fe0,
                .irq            = IRQ_SERIALPORT,
                .uartclk        = 1843200,
                .regshift       = 2,
                .iotype         = UPIO_MEM,
                .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
        },
        { },
};

static struct platform_device serial_device = {
        .name                   = "serial8250",
        .id                     = PLAT8250_DEV_PLATFORM,
        .dev                    = {
                .platform_data  = serial_platform_data,
        },
};

static struct pata_platform_info pata_platform_data = {
        .ioport_shift           = 2,
};

static struct resource pata_resources[] = {
        DEFINE_RES_MEM(0x030107c0, 0x20),
        DEFINE_RES_MEM(0x03010fd8, 0x04),
        DEFINE_RES_IRQ(IRQ_HARDDISK),
};

static struct platform_device pata_device = {
        .name                   = "pata_platform",
        .id                     = -1,
        .num_resources          = ARRAY_SIZE(pata_resources),
        .resource               = pata_resources,
        .dev                    = {
                .platform_data  = &pata_platform_data,
                .coherent_dma_mask = ~0,        /* grumble */
        },
};

static struct platform_device *devs[] __initdata = {
        &iomd_device,
        &kbd_device,
        &serial_device,
        &acornfb_device,
        &pata_device,
};

static struct i2c_board_info i2c_rtc = {
        I2C_BOARD_INFO("pcf8583", 0x50)
};

static int __init rpc_init(void)
{
        i2c_register_board_info(0, &i2c_rtc, 1);
        return platform_add_devices(devs, ARRAY_SIZE(devs));
}

arch_initcall(rpc_init);

static void rpc_restart(enum reboot_mode mode, const char *cmd)
{
        iomd_writeb(0, IOMD_ROMCR0);

        /*
         * Jump into the ROM
         */
        soft_restart(0);
}

void ioc_timer_init(void);

MACHINE_START(RISCPC, "Acorn-RiscPC")
        /* Maintainer: Russell King */
        .atag_offset    = 0x100,
        .reserve_lp0    = 1,
        .reserve_lp1    = 1,
        .map_io         = rpc_map_io,
        .init_irq       = rpc_init_irq,
        .init_time      = ioc_timer_init,
        .restart        = rpc_restart,
MACHINE_END