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mach-gta02.c

/*
 * 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

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