/*
 * linux/arch/arm/mach-s3c2442/mach-gta02.c
 *
 * S3C2442 Machine Support for Openmoko GTA02 / FreeRunner.
 *
 * Copyright (C) 2006-2009 by Openmoko, Inc.
 * Authors: Harald Welte <laforge@openmoko.org>
 *          Andy Green <andy@openmoko.org>
 *          Werner Almesberger <werner@openmoko.org>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <linux/spi/spi.h>

#include <linux/mmc/host.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/io.h>

#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/regulator/machine.h>

#include <linux/mfd/pcf50633/core.h>
#include <linux/mfd/pcf50633/mbc.h>
#include <linux/mfd/pcf50633/adc.h>
#include <linux/mfd/pcf50633/gpio.h>
#include <linux/mfd/pcf50633/pmic.h>

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

#include <asm/irq.h>
#include <asm/mach-types.h>

#include <mach/regs-irq.h>
#include <mach/regs-gpio.h>
#include <mach/regs-gpioj.h>
#include <mach/fb.h>

#include <mach/spi.h>
#include <mach/spi-gpio.h>
#include <plat/usb-control.h>
#include <mach/regs-mem.h>
#include <mach/hardware.h>

#include <mach/gta02.h>

#include <plat/regs-serial.h>
#include <plat/nand.h>
#include <plat/devs.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include <plat/udc.h>
#include <plat/gpio-cfg.h>
#include <plat/iic.h>

static struct pcf50633 *gta02_pcf;

/*
 * This gets called every 1ms when we paniced.
 */

static long gta02_panic_blink(long count)
{
        long delay = 0;
        static long last_blink;
        static char led;

        /* Fast blink: 200ms period. */
        if (count - last_blink < 100)
                return 0;

        led ^= 1;
        gpio_direction_output(GTA02_GPIO_AUX_LED, led);

        last_blink = count;

        return delay;
}


static struct map_desc gta02_iodesc[] __initdata = {
        {
                .virtual        = 0xe0000000,
                .pfn            = __phys_to_pfn(S3C2410_CS3 + 0x01000000),
                .length         = SZ_1M,
                .type           = MT_DEVICE
        },
};

#define UCON (S3C2410_UCON_DEFAULT | S3C2443_UCON_RXERR_IRQEN)
#define ULCON (S3C2410_LCON_CS8 | S3C2410_LCON_PNONE | S3C2410_LCON_STOPB)
#define UFCON (S3C2410_UFCON_RXTRIG8 | S3C2410_UFCON_FIFOMODE)

static struct s3c2410_uartcfg gta02_uartcfgs[] = {
        [0] = {
                .hwport         = 0,
                .flags          = 0,
                .ucon           = UCON,
                .ulcon          = ULCON,
                .ufcon          = UFCON,
        },
        [1] = {
                .hwport         = 1,
                .flags          = 0,
                .ucon           = UCON,
                .ulcon          = ULCON,
                .ufcon          = UFCON,
        },
        [2] = {
                .hwport         = 2,
                .flags          = 0,
                .ucon           = UCON,
                .ulcon          = ULCON,
                .ufcon          = UFCON,
        },
};

#ifdef CONFIG_CHARGER_PCF50633
/*
 * On GTA02 the 1A charger features a 48K resistor to 0V on the ID pin.
 * We use this to recognize that we can pull 1A from the USB socket.
 *
 * These constants are the measured pcf50633 ADC levels with the 1A
 * charger / 48K resistor, and with no pulldown resistor.
 */

#define ADC_NOM_CHG_DETECT_1A 6
#define ADC_NOM_CHG_DETECT_USB 43

static void
gta02_configure_pmu_for_charger(struct pcf50633 *pcf, void *unused, int res)
{
        int  ma;

        /* Interpret charger type */
        if (res < ((ADC_NOM_CHG_DETECT_USB + ADC_NOM_CHG_DETECT_1A) / 2)) {

                /*
                 * Sanity - stop GPO driving out now that we have a 1A charger
                 * GPO controls USB Host power generation on GTA02
                 */
                pcf50633_gpio_set(pcf, PCF50633_GPO, 0);

                ma = 1000;
        } else
                ma = 100;

        pcf50633_mbc_usb_curlim_set(pcf, ma);
}

static struct delayed_work gta02_charger_work;
static int gta02_usb_vbus_draw;

static void gta02_charger_worker(struct work_struct *work)
{
        if (gta02_usb_vbus_draw) {
                pcf50633_mbc_usb_curlim_set(gta02_pcf, gta02_usb_vbus_draw);
                return;
        }

#ifdef CONFIG_PCF50633_ADC
        pcf50633_adc_async_read(gta02_pcf,
                                PCF50633_ADCC1_MUX_ADCIN1,
                                PCF50633_ADCC1_AVERAGE_16,
                                gta02_configure_pmu_for_charger,
                                NULL);
#else
        /*
         * If the PCF50633 ADC is disabled we fallback to a
         * 100mA limit for safety.
         */
        pcf50633_mbc_usb_curlim_set(pcf, 100);
#endif
}

#define GTA02_CHARGER_CONFIGURE_TIMEOUT ((3000 * HZ) / 1000)

static void gta02_pmu_event_callback(struct pcf50633 *pcf, int irq)
{
        if (irq == PCF50633_IRQ_USBINS) {
                schedule_delayed_work(&gta02_charger_work,
                                      GTA02_CHARGER_CONFIGURE_TIMEOUT);

                return;
        }

        if (irq == PCF50633_IRQ_USBREM) {
                cancel_delayed_work_sync(&gta02_charger_work);
                gta02_usb_vbus_draw = 0;
        }
}

static void gta02_udc_vbus_draw(unsigned int ma)
{
        if (!gta02_pcf)
                return;

        gta02_usb_vbus_draw = ma;

        schedule_delayed_work(&gta02_charger_work,
                              GTA02_CHARGER_CONFIGURE_TIMEOUT);
}
#else /* !CONFIG_CHARGER_PCF50633 */
#define gta02_pmu_event_callback        NULL
#define gta02_udc_vbus_draw             NULL
#endif

/*
 * This is called when pc50633 is probed, unfortunately quite late in the
 * day since it is an I2C bus device. Here we can belatedly define some
 * platform devices with the advantage that we can mark the pcf50633 as the
 * parent. This makes them get suspended and resumed with their parent
 * the pcf50633 still around.
 */

static void gta02_pmu_attach_child_devices(struct pcf50633 *pcf);


static char *gta02_batteries[] = {
        "battery",
};

struct pcf50633_platform_data gta02_pcf_pdata = {
        .resumers = {
                [0] =   PCF50633_INT1_USBINS |
                        PCF50633_INT1_USBREM |
                        PCF50633_INT1_ALARM,
                [1] =   PCF50633_INT2_ONKEYF,
                [2] =   PCF50633_INT3_ONKEY1S,
                [3] =   PCF50633_INT4_LOWSYS |
                        PCF50633_INT4_LOWBAT |
                        PCF50633_INT4_HIGHTMP,
        },

        .batteries = gta02_batteries,
        .num_batteries = ARRAY_SIZE(gta02_batteries),
        .reg_init_data = {
                [PCF50633_REGULATOR_AUTO] = {
                        .constraints = {
                                .min_uV = 3300000,
                                .max_uV = 3300000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .always_on = 1,
                                .apply_uV = 1,
                                .state_mem = {
                                        .enabled = 1,
                                },
                        },
                },
                [PCF50633_REGULATOR_DOWN1] = {
                        .constraints = {
                                .min_uV = 1300000,
                                .max_uV = 1600000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .always_on = 1,
                                .apply_uV = 1,
                        },
                },
                [PCF50633_REGULATOR_DOWN2] = {
                        .constraints = {
                                .min_uV = 1800000,
                                .max_uV = 1800000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                                .always_on = 1,
                                .state_mem = {
                                        .enabled = 1,
                                },
                        },
                },
                [PCF50633_REGULATOR_HCLDO] = {
                        .constraints = {
                                .min_uV = 2000000,
                                .max_uV = 3300000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
                                .always_on = 1,
                        },
                },
                [PCF50633_REGULATOR_LDO1] = {
                        .constraints = {
                                .min_uV = 3300000,
                                .max_uV = 3300000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                                .state_mem = {
                                        .enabled = 0,
                                },
                        },
                },
                [PCF50633_REGULATOR_LDO2] = {
                        .constraints = {
                                .min_uV = 3300000,
                                .max_uV = 3300000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                        },
                },
                [PCF50633_REGULATOR_LDO3] = {
                        .constraints = {
                                .min_uV = 3000000,
                                .max_uV = 3000000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                        },
                },
                [PCF50633_REGULATOR_LDO4] = {
                        .constraints = {
                                .min_uV = 3200000,
                                .max_uV = 3200000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                        },
                },
                [PCF50633_REGULATOR_LDO5] = {
                        .constraints = {
                                .min_uV = 3000000,
                                .max_uV = 3000000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .apply_uV = 1,
                                .state_mem = {
                                        .enabled = 1,
                                },
                        },
                },
                [PCF50633_REGULATOR_LDO6] = {
                        .constraints = {
                                .min_uV = 3000000,
                                .max_uV = 3000000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                        },
                },
                [PCF50633_REGULATOR_MEMLDO] = {
                        .constraints = {
                                .min_uV = 1800000,
                                .max_uV = 1800000,
                                .valid_modes_mask = REGULATOR_MODE_NORMAL,
                                .state_mem = {
                                        .enabled = 1,
                                },
                        },
                },

        },
        .probe_done = gta02_pmu_attach_child_devices,
        .mbc_event_callback = gta02_pmu_event_callback,
};


/* NOR Flash. */

#define GTA02_FLASH_BASE        0x18000000 /* GCS3 */
#define GTA02_FLASH_SIZE        0x200000 /* 2MBytes */

static struct physmap_flash_data gta02_nor_flash_data = {
        .width          = 2,
};

static struct resource gta02_nor_flash_resource = {
        .start          = GTA02_FLASH_BASE,
        .end            = GTA02_FLASH_BASE + GTA02_FLASH_SIZE - 1,
        .flags          = IORESOURCE_MEM,
};

static struct platform_device gta02_nor_flash = {
        .name           = "physmap-flash",
        .id             = 0,
        .dev            = {
                .platform_data  = &gta02_nor_flash_data,
        },
        .resource       = &gta02_nor_flash_resource,
        .num_resources  = 1,
};


struct platform_device s3c24xx_pwm_device = {
        .name           = "s3c24xx_pwm",
        .num_resources  = 0,
};

static struct i2c_board_info gta02_i2c_devs[] __initdata = {
        {
                I2C_BOARD_INFO("pcf50633", 0x73),
                .irq = GTA02_IRQ_PCF50633,
                .platform_data = &gta02_pcf_pdata,
        },
        {
                I2C_BOARD_INFO("wm8753", 0x1a),
        },
};

static struct s3c2410_nand_set gta02_nand_sets[] = {
        [0] = {
                /*
                 * This name is also hard-coded in the boot loaders, so
                 * changing it would would require all users to upgrade
                 * their boot loaders, some of which are stored in a NOR
                 * that is considered to be immutable.
                 */
                .name           = "neo1973-nand",
                .nr_chips       = 1,
                .flash_bbt      = 1,
        },
};

/*
 * Choose a set of timings derived from S3C@2442B MCP54
 * data sheet (K5D2G13ACM-D075 MCP Memory).
 */

static struct s3c2410_platform_nand gta02_nand_info = {
        .tacls          = 0,
        .twrph0         = 25,
        .twrph1         = 15,
        .nr_sets        = ARRAY_SIZE(gta02_nand_sets),
        .sets           = gta02_nand_sets,
};


static void gta02_udc_command(enum s3c2410_udc_cmd_e cmd)
{
        switch (cmd) {
        case S3C2410_UDC_P_ENABLE:
                pr_debug("%s S3C2410_UDC_P_ENABLE\n", __func__);
                gpio_direction_output(GTA02_GPIO_USB_PULLUP, 1);
                break;
        case S3C2410_UDC_P_DISABLE:
                pr_debug("%s S3C2410_UDC_P_DISABLE\n", __func__);
                gpio_direction_output(GTA02_GPIO_USB_PULLUP, 0);
                break;
        case S3C2410_UDC_P_RESET:
                pr_debug("%s S3C2410_UDC_P_RESET\n", __func__);
                /* FIXME: Do something here. */
        }
}

/* Get PMU to set USB current limit accordingly. */
static struct s3c2410_udc_mach_info gta02_udc_cfg = {
        .vbus_draw      = gta02_udc_vbus_draw,
        .udc_command    = gta02_udc_command,

};



static void gta02_bl_set_intensity(int intensity)
{
        struct pcf50633 *pcf = gta02_pcf;
        int old_intensity = pcf50633_reg_read(pcf, PCF50633_REG_LEDOUT);

        /* We map 8-bit intensity to 6-bit intensity in hardware. */
        intensity >>= 2;

        /*
         * This can happen during, eg, print of panic on blanked console,
         * but we can't service i2c without interrupts active, so abort.
         */
        if (in_atomic()) {
                printk(KERN_ERR "gta02_bl_set_intensity called while atomic\n");
                return;
        }

        old_intensity = pcf50633_reg_read(pcf, PCF50633_REG_LEDOUT);
        if (intensity == old_intensity)
                return;

        /* We can't do this anywhere else. */
        pcf50633_reg_write(pcf, PCF50633_REG_LEDDIM, 5);

        if (!(pcf50633_reg_read(pcf, PCF50633_REG_LEDENA) & 3))
                old_intensity = 0;

        /*
         * The PCF50633 cannot handle LEDOUT = 0 (datasheet p60)
         * if seen, you have to re-enable the LED unit.
         */
        if (!intensity || !old_intensity)
                pcf50633_reg_write(pcf, PCF50633_REG_LEDENA, 0);

        /* Illegal to set LEDOUT to 0. */
        if (!intensity)
                pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_LEDOUT, 0x3f, 2);
        else
                pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_LEDOUT, 0x3f,
                                          intensity);

        if (intensity)
                pcf50633_reg_write(pcf, PCF50633_REG_LEDENA, 2);

}

static struct generic_bl_info gta02_bl_info = {
        .name                   = "gta02-bl",
        .max_intensity          = 0xff,
        .default_intensity      = 0xff,
        .set_bl_intensity       = gta02_bl_set_intensity,
};

static struct platform_device gta02_bl_dev = {
        .name                   = "generic-bl",
        .id                     = 1,
        .dev = {
                .platform_data = &gta02_bl_info,
        },
};



/* USB */
static struct s3c2410_hcd_info gta02_usb_info = {
        .port[0]        = {
                .flags  = S3C_HCDFLG_USED,
        },
        .port[1]        = {
                .flags  = 0,
        },
};


static void __init gta02_map_io(void)
{
        s3c24xx_init_io(gta02_iodesc, ARRAY_SIZE(gta02_iodesc));
        s3c24xx_init_clocks(12000000);
        s3c24xx_init_uarts(gta02_uartcfgs, ARRAY_SIZE(gta02_uartcfgs));
}


/* These are the guys that don't need to be children of PMU. */

static struct platform_device *gta02_devices[] __initdata = {
        &s3c_device_usb,
        &s3c_device_wdt,
        &s3c_device_sdi,
        &s3c_device_usbgadget,
        &s3c_device_nand,
        &gta02_nor_flash,
        &s3c24xx_pwm_device,
        &s3c_device_iis,
        &s3c_device_i2c0,
};

/* These guys DO need to be children of PMU. */

static struct platform_device *gta02_devices_pmu_children[] = {
        &gta02_bl_dev,
};


/*
 * This is called when pc50633 is probed, quite late in the day since it is an
 * I2C bus device.  Here we can define platform devices with the advantage that
 * we can mark the pcf50633 as the parent.  This makes them get suspended and
 * resumed with their parent the pcf50633 still around.  All devices whose
 * operation depends on something from pcf50633 must have this relationship
 * made explicit like this, or suspend and resume will become an unreliable
 * hellworld.
 */

static void gta02_pmu_attach_child_devices(struct pcf50633 *pcf)
{
        int n;

        /* Grab a copy of the now probed PMU pointer. */
        gta02_pcf = pcf;

        for (n = 0; n < ARRAY_SIZE(gta02_devices_pmu_children); n++)
                gta02_devices_pmu_children[n]->dev.parent = pcf->dev;

        platform_add_devices(gta02_devices_pmu_children,
                             ARRAY_SIZE(gta02_devices_pmu_children));
}

static void gta02_poweroff(void)
{
        pcf50633_reg_set_bit_mask(gta02_pcf, PCF50633_REG_OOCSHDWN, 1, 1);
}

static void __init gta02_machine_init(void)
{
        /* Set the panic callback to make AUX LED blink at ~5Hz. */
        panic_blink = gta02_panic_blink;

        s3c_pm_init();

#ifdef CONFIG_CHARGER_PCF50633
        INIT_DELAYED_WORK(&gta02_charger_work, gta02_charger_worker);
#endif

        s3c_device_usb.dev.platform_data = &gta02_usb_info;
        s3c_device_nand.dev.platform_data = &gta02_nand_info;

        s3c24xx_udc_set_platdata(&gta02_udc_cfg);
        s3c_i2c0_set_platdata(NULL);

        i2c_register_board_info(0, gta02_i2c_devs, ARRAY_SIZE(gta02_i2c_devs));

        platform_add_devices(gta02_devices, ARRAY_SIZE(gta02_devices));
        pm_power_off = gta02_poweroff;
}


MACHINE_START(NEO1973_GTA02, "GTA02")
        /* Maintainer: Nelson Castillo <arhuaco@freaks-unidos.net> */
        .phys_io        = S3C2410_PA_UART,
        .io_pg_offst    = (((u32)S3C24XX_VA_UART) >> 18) & 0xfffc,
        .boot_params    = S3C2410_SDRAM_PA + 0x100,
        .map_io         = gta02_map_io,
        .init_irq       = s3c24xx_init_irq,
        .init_machine   = gta02_machine_init,
        .timer          = &s3c24xx_timer,
MACHINE_END