// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mach-pxa/gumstix.c
 *
 *  Support for the Gumstix motherboards.
 *
 *  Original Author:    Craig Hughes
 *  Created:    Feb 14, 2008
 *  Copyright:  Craig Hughes
 *
 *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
 *  Hughes
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/property.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/clk.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <linux/sizes.h>

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

#include "pxa25x.h"
#include <linux/platform_data/mmc-pxamci.h>
#include "udc.h"
#include "gumstix.h"
#include "devices.h"

#include "generic.h"

static struct resource flash_resource = {
        .start  = 0x00000000,
        .end    = SZ_64M - 1,
        .flags  = IORESOURCE_MEM,
};

static struct mtd_partition gumstix_partitions[] = {
        {
                .name =         "Bootloader",
                .size =         0x00040000,
                .offset =       0,
                .mask_flags =   MTD_WRITEABLE  /* force read-only */
        } , {
                .name =         "rootfs",
                .size =         MTDPART_SIZ_FULL,
                .offset =       MTDPART_OFS_APPEND
        }
};

static struct flash_platform_data gumstix_flash_data = {
        .map_name       = "cfi_probe",
        .parts          = gumstix_partitions,
        .nr_parts       = ARRAY_SIZE(gumstix_partitions),
        .width          = 2,
};

static struct platform_device gumstix_flash_device = {
        .name           = "pxa2xx-flash",
        .id             = 0,
        .dev = {
                .platform_data = &gumstix_flash_data,
        },
        .resource = &flash_resource,
        .num_resources = 1,
};

static struct platform_device *devices[] __initdata = {
        &gumstix_flash_device,
};

#ifdef CONFIG_MMC_PXA
static struct pxamci_platform_data gumstix_mci_platform_data = {
        .ocr_mask               = MMC_VDD_32_33|MMC_VDD_33_34,
};

static void __init gumstix_mmc_init(void)
{
        pxa_set_mci_info(&gumstix_mci_platform_data, NULL);
}
#else
static void __init gumstix_mmc_init(void)
{
        pr_debug("Gumstix mmc disabled\n");
}
#endif

#if IS_ENABLED(CONFIG_USB_PXA25X)
static const struct property_entry gumstix_vbus_props[] __initconst = {
        PROPERTY_ENTRY_GPIO("vbus-gpios", &pxa2xx_gpiochip_node,
                            GPIO_GUMSTIX_USB_GPIOn, GPIO_ACTIVE_HIGH),
        PROPERTY_ENTRY_GPIO("pullup-gpios", &pxa2xx_gpiochip_node,
                            GPIO_GUMSTIX_USB_GPIOx, GPIO_ACTIVE_HIGH),
        { }
};

static const struct platform_device_info gumstix_gpio_vbus_info __initconst = {
        .name           = "gpio-vbus",
        .id             = PLATFORM_DEVID_NONE,
        .properties     = gumstix_vbus_props,
};

static void __init gumstix_udc_init(void)
{
        platform_device_register_full(&gumstix_gpio_vbus_info);
}
#else
static void gumstix_udc_init(void)
{
        pr_debug("Gumstix udc is disabled\n");
}
#endif

#ifdef CONFIG_BT
/* Normally, the bootloader would have enabled this 32kHz clock but many
** boards still have u-boot 1.1.4 so we check if it has been turned on and
** if not, we turn it on with a warning message. */
static void gumstix_setup_bt_clock(void)
{
        int timeout = 500;

        if (!(readl(OSCC) & OSCC_OOK))
                pr_warn("32kHz clock was not on. Bootloader may need to be updated\n");
        else
                return;

        writel(readl(OSCC) | OSCC_OON, OSCC);
        do {
                if (readl(OSCC) & OSCC_OOK)
                        break;
                udelay(1);
        } while (--timeout);
        if (!timeout)
                pr_err("Failed to start 32kHz clock\n");
}

static void __init gumstix_bluetooth_init(void)
{
        int err;

        gumstix_setup_bt_clock();

        err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
        if (err) {
                pr_err("gumstix: failed request gpio for bluetooth reset\n");
                return;
        }

        err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
        if (err) {
                pr_err("gumstix: can't reset bluetooth\n");
                return;
        }
        gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
        udelay(100);
        gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
}
#else
static void gumstix_bluetooth_init(void)
{
        pr_debug("Gumstix Bluetooth is disabled\n");
}
#endif

static unsigned long gumstix_pin_config[] __initdata = {
        GPIO12_32KHz,
        /* BTUART */
        GPIO42_HWUART_RXD,
        GPIO43_HWUART_TXD,
        GPIO44_HWUART_CTS,
        GPIO45_HWUART_RTS,
        /* MMC */
        GPIO6_MMC_CLK,
        GPIO53_MMC_CLK,
        GPIO8_MMC_CS0,
};

int __attribute__((weak)) am200_init(void)
{
        return 0;
}

int __attribute__((weak)) am300_init(void)
{
        return 0;
}

static void __init carrier_board_init(void)
{
        /*
         * put carrier/expansion board init here if
         * they cannot be detected programatically
         */
        am200_init();
        am300_init();
}

static void __init gumstix_init(void)
{
        pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));

        pxa_set_ffuart_info(NULL);
        pxa_set_btuart_info(NULL);
        pxa_set_stuart_info(NULL);
        pxa_set_hwuart_info(NULL);

        gumstix_bluetooth_init();
        gumstix_udc_init();
        gumstix_mmc_init();
        (void) platform_add_devices(devices, ARRAY_SIZE(devices));
        carrier_board_init();
}

MACHINE_START(GUMSTIX, "Gumstix")
        .atag_offset    = 0x100, /* match u-boot bi_boot_params */
        .map_io         = pxa25x_map_io,
        .nr_irqs        = PXA_NR_IRQS,
        .init_irq       = pxa25x_init_irq,
        .init_time      = pxa_timer_init,
        .init_machine   = gumstix_init,
        .restart        = pxa_restart,
MACHINE_END