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h3600.c

/*
 * Hardware definitions for Compaq iPAQ H3xxx Handheld Computers
 *
 * Copyright 2000,1 Compaq Computer Corporation.
 *
 * Use consistent with the GNU GPL is permitted,
 * provided that this copyright notice is
 * preserved in its entirety in all copies and derived works.
 *
 * COMPAQ COMPUTER CORPORATION MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
 * FITNESS FOR ANY PARTICULAR PURPOSE.
 *
 * Author: Jamey Hicks.
 *
 * History:
 *
 * 2001-10-??     Andrew Christian   Added support for iPAQ H3800
 *                         and abstracted EGPIO interface.
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/serial_core.h>

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

#include <asm/mach/irq.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/irda.h>
#include <asm/mach/map.h>
#include <asm/mach/serial_sa1100.h>

#include <mach/h3600.h>

#if defined (CONFIG_SA1100_H3600) || defined (CONFIG_SA1100_H3100)
#include <mach/h3600_gpio.h>
#endif

#ifdef CONFIG_SA1100_H3800
#include <mach/h3600_asic.h>
#endif

#include "generic.h"

struct ipaq_model_ops ipaq_model_ops;
EXPORT_SYMBOL(ipaq_model_ops);

static struct mtd_partition h3xxx_partitions[] = {
      {
            .name       = "H3XXX boot firmware",
            .size       = 0x00040000,
            .offset           = 0,
            .mask_flags = MTD_WRITEABLE,  /* force read-only */
      }, {
#ifdef CONFIG_MTD_2PARTS_IPAQ
            .name       = "H3XXX root jffs2",
            .size       = MTDPART_SIZ_FULL,
            .offset           = 0x00040000,
#else
            .name       = "H3XXX kernel",
            .size       = 0x00080000,
            .offset           = 0x00040000,
      }, {
            .name       = "H3XXX params",
            .size       = 0x00040000,
            .offset           = 0x000C0000,
      }, {
#ifdef CONFIG_JFFS2_FS
            .name       = "H3XXX root jffs2",
            .size       = MTDPART_SIZ_FULL,
            .offset           = 0x00100000,
#else
            .name       = "H3XXX initrd",
            .size       = 0x00100000,
            .offset           = 0x00100000,
      }, {
            .name       = "H3XXX root cramfs",
            .size       = 0x00300000,
            .offset           = 0x00200000,
      }, {
            .name       = "H3XXX usr cramfs",
            .size       = 0x00800000,
            .offset           = 0x00500000,
      }, {
            .name       = "H3XXX usr local",
            .size       = MTDPART_SIZ_FULL,
            .offset           = 0x00d00000,
#endif
#endif
      }
};

static void h3xxx_set_vpp(int vpp)
{
      assign_h3600_egpio(IPAQ_EGPIO_VPP_ON, vpp);
}

static struct flash_platform_data h3xxx_flash_data = {
      .map_name   = "cfi_probe",
      .set_vpp    = h3xxx_set_vpp,
      .parts            = h3xxx_partitions,
      .nr_parts   = ARRAY_SIZE(h3xxx_partitions),
};

static struct resource h3xxx_flash_resource = {
      .start            = SA1100_CS0_PHYS,
      .end        = SA1100_CS0_PHYS + SZ_32M - 1,
      .flags            = IORESOURCE_MEM,
};

/*
 * This turns the IRDA power on or off on the Compaq H3600
 */
static int h3600_irda_set_power(struct device *dev, unsigned int state)
{
      assign_h3600_egpio( IPAQ_EGPIO_IR_ON, state );

      return 0;
}

static void h3600_irda_set_speed(struct device *dev, unsigned int speed)
{
      if (speed < 4000000) {
            clr_h3600_egpio(IPAQ_EGPIO_IR_FSEL);
      } else {
            set_h3600_egpio(IPAQ_EGPIO_IR_FSEL);
      }
}

static struct irda_platform_data h3600_irda_data = {
      .set_power  = h3600_irda_set_power,
      .set_speed  = h3600_irda_set_speed,
};

static void h3xxx_mach_init(void)
{
      sa11x0_set_flash_data(&h3xxx_flash_data, &h3xxx_flash_resource, 1);
      sa11x0_set_irda_data(&h3600_irda_data);
}

/*
 * low-level UART features
 */

static void h3600_uart_set_mctrl(struct uart_port *port, u_int mctrl)
{
      if (port->mapbase == _Ser3UTCR0) {
            if (mctrl & TIOCM_RTS)
                  GPCR = GPIO_H3600_COM_RTS;
            else
                  GPSR = GPIO_H3600_COM_RTS;
      }
}

static u_int h3600_uart_get_mctrl(struct uart_port *port)
{
      u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;

      if (port->mapbase == _Ser3UTCR0) {
            int gplr = GPLR;
            /* DCD and CTS bits are inverted in GPLR by RS232 transceiver */
            if (gplr & GPIO_H3600_COM_DCD)
                  ret &= ~TIOCM_CD;
            if (gplr & GPIO_H3600_COM_CTS)
                  ret &= ~TIOCM_CTS;
      }

      return ret;
}

static void h3600_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
{
      if (port->mapbase == _Ser2UTCR0) { /* TODO: REMOVE THIS */
            assign_h3600_egpio(IPAQ_EGPIO_IR_ON, !state);
      } else if (port->mapbase == _Ser3UTCR0) {
            assign_h3600_egpio(IPAQ_EGPIO_RS232_ON, !state);
      }
}

/*
 * Enable/Disable wake up events for this serial port.
 * Obviously, we only support this on the normal COM port.
 */
static int h3600_uart_set_wake(struct uart_port *port, u_int enable)
{
      int err = -EINVAL;

      if (port->mapbase == _Ser3UTCR0) {
            if (enable)
                  PWER |= PWER_GPIO23 | PWER_GPIO25; /* DCD and CTS */
            else
                  PWER &= ~(PWER_GPIO23 | PWER_GPIO25); /* DCD and CTS */
            err = 0;
      }
      return err;
}

static struct sa1100_port_fns h3600_port_fns __initdata = {
      .set_mctrl  = h3600_uart_set_mctrl,
      .get_mctrl  = h3600_uart_get_mctrl,
      .pm         = h3600_uart_pm,
      .set_wake   = h3600_uart_set_wake,
};

/*
 * helper for sa1100fb
 */
static void h3xxx_lcd_power(int enable)
{
      assign_h3600_egpio(IPAQ_EGPIO_LCD_POWER, enable);
}

static struct map_desc h3600_io_desc[] __initdata = {
      {     /* static memory bank 2  CS#2 */
            .virtual    =  H3600_BANK_2_VIRT,
            .pfn        = __phys_to_pfn(SA1100_CS2_PHYS),
            .length           = 0x02800000,
            .type       = MT_DEVICE
      }, {  /* static memory bank 4  CS#4 */
            .virtual    =  H3600_BANK_4_VIRT,
            .pfn        = __phys_to_pfn(SA1100_CS4_PHYS),
            .length           = 0x00800000,
            .type       = MT_DEVICE
      }, {  /* EGPIO 0        CS#5 */
            .virtual    =  H3600_EGPIO_VIRT,
            .pfn        = __phys_to_pfn(H3600_EGPIO_PHYS),
            .length           = 0x01000000,
            .type       = MT_DEVICE
      }
};

/*
 * Common map_io initialization
 */

static void __init h3xxx_map_io(void)
{
      sa1100_map_io();
      iotable_init(h3600_io_desc, ARRAY_SIZE(h3600_io_desc));

      sa1100_register_uart_fns(&h3600_port_fns);
      sa1100_register_uart(0, 3); /* Common serial port */
//    sa1100_register_uart(1, 1); /* Microcontroller on 3100/3600 */

      /* Ensure those pins are outputs and driving low  */
      PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
      PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);

      /* Configure suspend conditions */
      PGSR = 0;
      PWER = PWER_GPIO0 | PWER_RTC;
      PCFR = PCFR_OPDE;
      PSDR = 0;

      sa1100fb_lcd_power = h3xxx_lcd_power;
}

static __inline__ void do_blank(int setp)
{
      if (ipaq_model_ops.blank_callback)
            ipaq_model_ops.blank_callback(1-setp);
}

/************************* H3100 *************************/

#ifdef CONFIG_SA1100_H3100

#define H3100_EGPIO     (*(volatile unsigned int *)H3600_EGPIO_VIRT)
static unsigned int h3100_egpio = 0;

static void h3100_control_egpio(enum ipaq_egpio_type x, int setp)
{
      unsigned int egpio = 0;
      long       gpio = 0;
      unsigned long flags;

      switch (x) {
      case IPAQ_EGPIO_LCD_POWER:
            egpio |= EGPIO_H3600_LCD_ON;
            gpio  |= GPIO_H3100_LCD_3V_ON;
            do_blank(setp);
            break;
      case IPAQ_EGPIO_LCD_ENABLE:
            break;
      case IPAQ_EGPIO_CODEC_NRESET:
            egpio |= EGPIO_H3600_CODEC_NRESET;
            break;
      case IPAQ_EGPIO_AUDIO_ON:
            gpio |= GPIO_H3100_AUD_PWR_ON
                  | GPIO_H3100_AUD_ON;
            break;
      case IPAQ_EGPIO_QMUTE:
            gpio |= GPIO_H3100_QMUTE;
            break;
      case IPAQ_EGPIO_OPT_NVRAM_ON:
            egpio |= EGPIO_H3600_OPT_NVRAM_ON;
            break;
      case IPAQ_EGPIO_OPT_ON:
            egpio |= EGPIO_H3600_OPT_ON;
            break;
      case IPAQ_EGPIO_CARD_RESET:
            egpio |= EGPIO_H3600_CARD_RESET;
            break;
      case IPAQ_EGPIO_OPT_RESET:
            egpio |= EGPIO_H3600_OPT_RESET;
            break;
      case IPAQ_EGPIO_IR_ON:
            gpio |= GPIO_H3100_IR_ON;
            break;
      case IPAQ_EGPIO_IR_FSEL:
            gpio |= GPIO_H3100_IR_FSEL;
            break;
      case IPAQ_EGPIO_RS232_ON:
            egpio |= EGPIO_H3600_RS232_ON;
            break;
      case IPAQ_EGPIO_VPP_ON:
            egpio |= EGPIO_H3600_VPP_ON;
            break;
      }

      if (egpio || gpio) {
            local_irq_save(flags);
            if (setp) {
                  h3100_egpio |= egpio;
                  GPSR = gpio;
            } else {
                  h3100_egpio &= ~egpio;
                  GPCR = gpio;
            }
            H3100_EGPIO = h3100_egpio;
            local_irq_restore(flags);
      }
}

static unsigned long h3100_read_egpio(void)
{
      return h3100_egpio;
}

static int h3100_pm_callback(int req)
{
      if (ipaq_model_ops.pm_callback_aux)
            return ipaq_model_ops.pm_callback_aux(req);
      return 0;
}

static struct ipaq_model_ops h3100_model_ops __initdata = {
      .generic_name     = "3100",
      .control    = h3100_control_egpio,
      .read       = h3100_read_egpio,
      .pm_callback      = h3100_pm_callback
};

#define H3100_DIRECT_EGPIO (GPIO_H3100_BT_ON      \
                    | GPIO_H3100_GPIO3      \
                    | GPIO_H3100_QMUTE      \
                    | GPIO_H3100_LCD_3V_ON  \
                    | GPIO_H3100_AUD_ON     \
                    | GPIO_H3100_AUD_PWR_ON \
                    | GPIO_H3100_IR_ON      \
                    | GPIO_H3100_IR_FSEL)

static void __init h3100_map_io(void)
{
      h3xxx_map_io();

      /* Initialize h3100-specific values here */
      GPCR = 0x0fffffff;       /* All outputs are set low by default */
      GPDR = GPIO_H3600_COM_RTS  | GPIO_H3600_L3_CLOCK |
             GPIO_H3600_L3_MODE  | GPIO_H3600_L3_DATA  |
             GPIO_H3600_CLK_SET1 | GPIO_H3600_CLK_SET0 |
             H3100_DIRECT_EGPIO;

      /* Older bootldrs put GPIO2-9 in alternate mode on the
         assumption that they are used for video */
      GAFR &= ~H3100_DIRECT_EGPIO;

      H3100_EGPIO = h3100_egpio;
      ipaq_model_ops = h3100_model_ops;
}

MACHINE_START(H3100, "Compaq iPAQ H3100")
      .phys_io    = 0x80000000,
      .io_pg_offst      = ((0xf8000000) >> 18) & 0xfffc,
      .boot_params      = 0xc0000100,
      .map_io           = h3100_map_io,
      .init_irq   = sa1100_init_irq,
      .timer            = &sa1100_timer,
      .init_machine     = h3xxx_mach_init,
MACHINE_END

#endif /* CONFIG_SA1100_H3100 */

/************************* H3600 *************************/

#ifdef CONFIG_SA1100_H3600

#define H3600_EGPIO     (*(volatile unsigned int *)H3600_EGPIO_VIRT)
static unsigned int h3600_egpio = EGPIO_H3600_RS232_ON;

static void h3600_control_egpio(enum ipaq_egpio_type x, int setp)
{
      unsigned int egpio = 0;
      unsigned long flags;

      switch (x) {
      case IPAQ_EGPIO_LCD_POWER:
            egpio |= EGPIO_H3600_LCD_ON |
                   EGPIO_H3600_LCD_PCI |
                   EGPIO_H3600_LCD_5V_ON |
                   EGPIO_H3600_LVDD_ON;
            do_blank(setp);
            break;
      case IPAQ_EGPIO_LCD_ENABLE:
            break;
      case IPAQ_EGPIO_CODEC_NRESET:
            egpio |= EGPIO_H3600_CODEC_NRESET;
            break;
      case IPAQ_EGPIO_AUDIO_ON:
            egpio |= EGPIO_H3600_AUD_AMP_ON |
                   EGPIO_H3600_AUD_PWR_ON;
            break;
      case IPAQ_EGPIO_QMUTE:
            egpio |= EGPIO_H3600_QMUTE;
            break;
      case IPAQ_EGPIO_OPT_NVRAM_ON:
            egpio |= EGPIO_H3600_OPT_NVRAM_ON;
            break;
      case IPAQ_EGPIO_OPT_ON:
            egpio |= EGPIO_H3600_OPT_ON;
            break;
      case IPAQ_EGPIO_CARD_RESET:
            egpio |= EGPIO_H3600_CARD_RESET;
            break;
      case IPAQ_EGPIO_OPT_RESET:
            egpio |= EGPIO_H3600_OPT_RESET;
            break;
      case IPAQ_EGPIO_IR_ON:
            egpio |= EGPIO_H3600_IR_ON;
            break;
      case IPAQ_EGPIO_IR_FSEL:
            egpio |= EGPIO_H3600_IR_FSEL;
            break;
      case IPAQ_EGPIO_RS232_ON:
            egpio |= EGPIO_H3600_RS232_ON;
            break;
      case IPAQ_EGPIO_VPP_ON:
            egpio |= EGPIO_H3600_VPP_ON;
            break;
      }

      if (egpio) {
            local_irq_save(flags);
            if (setp)
                  h3600_egpio |= egpio;
            else
                  h3600_egpio &= ~egpio;
            H3600_EGPIO = h3600_egpio;
            local_irq_restore(flags);
      }
}

static unsigned long h3600_read_egpio(void)
{
      return h3600_egpio;
}

static int h3600_pm_callback(int req)
{
      if (ipaq_model_ops.pm_callback_aux)
            return ipaq_model_ops.pm_callback_aux(req);
      return 0;
}

static struct ipaq_model_ops h3600_model_ops __initdata = {
      .generic_name     = "3600",
      .control    = h3600_control_egpio,
      .read       = h3600_read_egpio,
      .pm_callback      = h3600_pm_callback
};

static void __init h3600_map_io(void)
{
      h3xxx_map_io();

      /* Initialize h3600-specific values here */

      GPCR = 0x0fffffff;       /* All outputs are set low by default */
      GPDR = GPIO_H3600_COM_RTS  | GPIO_H3600_L3_CLOCK |
             GPIO_H3600_L3_MODE  | GPIO_H3600_L3_DATA  |
             GPIO_H3600_CLK_SET1 | GPIO_H3600_CLK_SET0 |
             GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12 |
             GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;

      H3600_EGPIO = h3600_egpio;       /* Maintains across sleep? */
      ipaq_model_ops = h3600_model_ops;
}

MACHINE_START(H3600, "Compaq iPAQ H3600")
      .phys_io    = 0x80000000,
      .io_pg_offst      = ((0xf8000000) >> 18) & 0xfffc,
      .boot_params      = 0xc0000100,
      .map_io           = h3600_map_io,
      .init_irq   = sa1100_init_irq,
      .timer            = &sa1100_timer,
      .init_machine     = h3xxx_mach_init,
MACHINE_END

#endif /* CONFIG_SA1100_H3600 */

#ifdef CONFIG_SA1100_H3800

#define SET_ASIC1(x) \
   do {if (setp) { H3800_ASIC1_GPIO_OUT |= (x); } else { H3800_ASIC1_GPIO_OUT &= ~(x); }} while(0)

#define SET_ASIC2(x) \
   do {if (setp) { H3800_ASIC2_GPIOPIOD |= (x); } else { H3800_ASIC2_GPIOPIOD &= ~(x); }} while(0)

#define CLEAR_ASIC1(x) \
   do {if (setp) { H3800_ASIC1_GPIO_OUT &= ~(x); } else { H3800_ASIC1_GPIO_OUT |= (x); }} while(0)

#define CLEAR_ASIC2(x) \
   do {if (setp) { H3800_ASIC2_GPIOPIOD &= ~(x); } else { H3800_ASIC2_GPIOPIOD |= (x); }} while(0)


/*
  On screen enable, we get

     h3800_video_power_on(1)
     LCD controller starts
     h3800_video_lcd_enable(1)

  On screen disable, we get

     h3800_video_lcd_enable(0)
     LCD controller stops
     h3800_video_power_on(0)
*/


static void h3800_video_power_on(int setp)
{
      if (setp) {
            H3800_ASIC1_GPIO_OUT |= GPIO1_LCD_ON;
            msleep(30);
            H3800_ASIC1_GPIO_OUT |= GPIO1_VGL_ON;
            msleep(5);
            H3800_ASIC1_GPIO_OUT |= GPIO1_VGH_ON;
            msleep(50);
            H3800_ASIC1_GPIO_OUT |= GPIO1_LCD_5V_ON;
            msleep(5);
      } else {
            msleep(5);
            H3800_ASIC1_GPIO_OUT &= ~GPIO1_LCD_5V_ON;
            msleep(50);
            H3800_ASIC1_GPIO_OUT &= ~GPIO1_VGL_ON;
            msleep(5);
            H3800_ASIC1_GPIO_OUT &= ~GPIO1_VGH_ON;
            msleep(100);
            H3800_ASIC1_GPIO_OUT &= ~GPIO1_LCD_ON;
      }
}

static void h3800_video_lcd_enable(int setp)
{
      if (setp) {
            msleep(17); // Wait one from before turning on
            H3800_ASIC1_GPIO_OUT |= GPIO1_LCD_PCI;
      } else {
            H3800_ASIC1_GPIO_OUT &= ~GPIO1_LCD_PCI;
            msleep(30); // Wait before turning off
      }
}


static void h3800_control_egpio(enum ipaq_egpio_type x, int setp)
{
      switch (x) {
      case IPAQ_EGPIO_LCD_POWER:
            h3800_video_power_on(setp);
            break;
      case IPAQ_EGPIO_LCD_ENABLE:
            h3800_video_lcd_enable(setp);
            break;
      case IPAQ_EGPIO_CODEC_NRESET:
      case IPAQ_EGPIO_AUDIO_ON:
      case IPAQ_EGPIO_QMUTE:
            printk("%s: error - should not be called\n", __func__);
            break;
      case IPAQ_EGPIO_OPT_NVRAM_ON:
            SET_ASIC2(GPIO2_OPT_ON_NVRAM);
            break;
      case IPAQ_EGPIO_OPT_ON:
            SET_ASIC2(GPIO2_OPT_ON);
            break;
      case IPAQ_EGPIO_CARD_RESET:
            SET_ASIC2(GPIO2_OPT_PCM_RESET);
            break;
      case IPAQ_EGPIO_OPT_RESET:
            SET_ASIC2(GPIO2_OPT_RESET);
            break;
      case IPAQ_EGPIO_IR_ON:
            CLEAR_ASIC1(GPIO1_IR_ON_N);
            break;
      case IPAQ_EGPIO_IR_FSEL:
            break;
      case IPAQ_EGPIO_RS232_ON:
            SET_ASIC1(GPIO1_RS232_ON);
            break;
      case IPAQ_EGPIO_VPP_ON:
            H3800_ASIC2_FlashWP_VPP_ON = setp;
            break;
      }
}

static unsigned long h3800_read_egpio(void)
{
      return H3800_ASIC1_GPIO_OUT | (H3800_ASIC2_GPIOPIOD << 16);
}

/* We need to fix ASIC2 GPIO over suspend/resume.  At the moment,
   it doesn't appear that ASIC1 GPIO has the same problem */

static int h3800_pm_callback(int req)
{
      static u16 asic1_data;
      static u16 asic2_data;
      int result = 0;

      printk("%s %d\n", __func__, req);

      switch (req) {
      case PM_RESUME:
            MSC2 = (MSC2 & 0x0000ffff) | 0xE4510000;  /* Set MSC2 correctly */

            H3800_ASIC2_GPIOPIOD = asic2_data;
            H3800_ASIC2_GPIODIR = GPIO2_PEN_IRQ
                  | GPIO2_SD_DETECT
                  | GPIO2_EAR_IN_N
                  | GPIO2_USB_DETECT_N
                  | GPIO2_SD_CON_SLT;

            H3800_ASIC1_GPIO_OUT = asic1_data;

            if (ipaq_model_ops.pm_callback_aux)
                  result = ipaq_model_ops.pm_callback_aux(req);
            break;

      case PM_SUSPEND:
            if (ipaq_model_ops.pm_callback_aux &&
                 ((result = ipaq_model_ops.pm_callback_aux(req)) != 0))
                  return result;

            asic1_data = H3800_ASIC1_GPIO_OUT;
            asic2_data = H3800_ASIC2_GPIOPIOD;
            break;
      default:
            printk("%s: unrecognized PM callback\n", __func__);
            break;
      }
      return result;
}

static struct ipaq_model_ops h3800_model_ops __initdata = {
      .generic_name     = "3800",
      .control    = h3800_control_egpio,
      .read       = h3800_read_egpio,
      .pm_callback      = h3800_pm_callback
};

#define MAX_ASIC_ISR_LOOPS    20

/* The order of these is important - see #include <mach/irqs.h> */
static u32 kpio_irq_mask[] = {
      KPIO_KEY_ALL,
      KPIO_SPI_INT,
      KPIO_OWM_INT,
      KPIO_ADC_INT,
      KPIO_UART_0_INT,
      KPIO_UART_1_INT,
      KPIO_TIMER_0_INT,
      KPIO_TIMER_1_INT,
      KPIO_TIMER_2_INT
};

static u32 gpio_irq_mask[] = {
      GPIO2_PEN_IRQ,
      GPIO2_SD_DETECT,
      GPIO2_EAR_IN_N,
      GPIO2_USB_DETECT_N,
      GPIO2_SD_CON_SLT,
};

static void h3800_IRQ_demux(unsigned int irq, struct irq_desc *desc)
{
      int i;

      if (0) printk("%s: interrupt received\n", __func__);

      desc->chip->ack(irq);

      for (i = 0; i < MAX_ASIC_ISR_LOOPS && (GPLR & GPIO_H3800_ASIC); i++) {
            u32 irq;
            int j;

            /* KPIO */
            irq = H3800_ASIC2_KPIINTFLAG;
            if (0) printk("%s KPIO 0x%08X\n", __func__, irq);
            for (j = 0; j < H3800_KPIO_IRQ_COUNT; j++)
                  if (irq & kpio_irq_mask[j])
                        handle_edge_irq(H3800_KPIO_IRQ_COUNT + j, irq_desc + H3800_KPIO_IRQ_COUNT + j);

            /* GPIO2 */
            irq = H3800_ASIC2_GPIINTFLAG;
            if (0) printk("%s GPIO 0x%08X\n", __func__, irq);
            for (j = 0; j < H3800_GPIO_IRQ_COUNT; j++)
                  if (irq & gpio_irq_mask[j])
                        handle_edge_irq(H3800_GPIO_IRQ_COUNT + j, irq_desc + H3800_GPIO_IRQ_COUNT + j);
      }

      if (i >= MAX_ASIC_ISR_LOOPS)
            printk("%s: interrupt processing overrun\n", __func__);

      /* For level-based interrupts */
      desc->chip->unmask(irq);

}

static struct irqaction h3800_irq = {
      .name       = "h3800_asic",
      .handler    = h3800_IRQ_demux,
      .flags            = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
};

u32 kpio_int_shadow = 0;


/* mask_ack <- IRQ is first serviced.
       mask <- IRQ is disabled.
     unmask <- IRQ is enabled

     The INTCLR registers are poorly documented.  I believe that writing
     a "1" to the register clears the specific interrupt, but the documentation
     indicates writing a "0" clears the interrupt.  In any case, they shouldn't
     be read (that's the INTFLAG register)
 */

static void h3800_mask_ack_kpio_irq(unsigned int irq)
{
      u32 mask = kpio_irq_mask[irq - H3800_KPIO_IRQ_START];
      kpio_int_shadow &= ~mask;
      H3800_ASIC2_KPIINTSTAT = kpio_int_shadow;
      H3800_ASIC2_KPIINTCLR  = mask;
}

static void h3800_mask_kpio_irq(unsigned int irq)
{
      u32 mask = kpio_irq_mask[irq - H3800_KPIO_IRQ_START];
      kpio_int_shadow &= ~mask;
      H3800_ASIC2_KPIINTSTAT = kpio_int_shadow;
}

static void h3800_unmask_kpio_irq(unsigned int irq)
{
      u32 mask = kpio_irq_mask[irq - H3800_KPIO_IRQ_START];
      kpio_int_shadow |= mask;
      H3800_ASIC2_KPIINTSTAT = kpio_int_shadow;
}

static void h3800_mask_ack_gpio_irq(unsigned int irq)
{
      u32 mask = gpio_irq_mask[irq - H3800_GPIO_IRQ_START];
      H3800_ASIC2_GPIINTSTAT &= ~mask;
      H3800_ASIC2_GPIINTCLR   = mask;
}

static void h3800_mask_gpio_irq(unsigned int irq)
{
      u32 mask = gpio_irq_mask[irq - H3800_GPIO_IRQ_START];
      H3800_ASIC2_GPIINTSTAT &= ~mask;
      }

static void h3800_unmask_gpio_irq(unsigned int irq)
{
      u32 mask = gpio_irq_mask[irq - H3800_GPIO_IRQ_START];
      H3800_ASIC2_GPIINTSTAT |= mask;
}

static void __init h3800_init_irq(void)
{
      int i;

      /* Initialize standard IRQs */
      sa1100_init_irq();

      /* Disable all IRQs and set up clock */
      H3800_ASIC2_KPIINTSTAT     =  0;     /* Disable all interrupts */
      H3800_ASIC2_GPIINTSTAT     =  0;

      H3800_ASIC2_KPIINTCLR      =  0;     /* Clear all KPIO interrupts */
      H3800_ASIC2_GPIINTCLR      =  0;     /* Clear all GPIO interrupts */

//    H3800_ASIC2_KPIINTCLR      =  0xffff;       /* Clear all KPIO interrupts */
//    H3800_ASIC2_GPIINTCLR      =  0xffff;       /* Clear all GPIO interrupts */

      H3800_ASIC2_CLOCK_Enable       |= ASIC2_CLOCK_EX0;   /* 32 kHZ crystal on */
      H3800_ASIC2_INTR_ClockPrescale |= ASIC2_INTCPS_SET;
      H3800_ASIC2_INTR_ClockPrescale      = ASIC2_INTCPS_CPS(0x0e) | ASIC2_INTCPS_SET;
      H3800_ASIC2_INTR_TimerSet     = 1;

#if 0
      for (i = 0; i < H3800_KPIO_IRQ_COUNT; i++) {
            int irq = i + H3800_KPIO_IRQ_START;
            irq_desc[irq].valid    = 1;
            irq_desc[irq].probe_ok = 1;
            set_irq_chip(irq, &h3800_kpio_irqchip);
      }

      for (i = 0; i < H3800_GPIO_IRQ_COUNT; i++) {
            int irq = i + H3800_GPIO_IRQ_START;
            irq_desc[irq].valid    = 1;
            irq_desc[irq].probe_ok = 1;
            set_irq_chip(irq, &h3800_gpio_irqchip);
      }
#endif
      set_irq_type(IRQ_GPIO_H3800_ASIC, IRQ_TYPE_EDGE_RISING);
      set_irq_chained_handler(IRQ_GPIO_H3800_ASIC, h3800_IRQ_demux);
}


#define ASIC1_OUTPUTS    0x7fff   /* First 15 bits are used */

static void __init h3800_map_io(void)
{
      h3xxx_map_io();

      /* Add wakeup on AC plug/unplug */
      PWER  |= PWER_GPIO12;

      /* Initialize h3800-specific values here */
      GPCR = 0x0fffffff;       /* All outputs are set low by default */
      GAFR =      GPIO_H3800_CLK_OUT |
            GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12 |
            GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;
      GPDR =      GPIO_H3800_CLK_OUT |
            GPIO_H3600_COM_RTS  | GPIO_H3600_L3_CLOCK |
            GPIO_H3600_L3_MODE  | GPIO_H3600_L3_DATA  |
            GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12 |
            GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;
      TUCR =      TUCR_3_6864MHz;   /* Seems to be used only for the Bluetooth UART */

      /* Fix the memory bus */
      MSC2 = (MSC2 & 0x0000ffff) | 0xE4510000;

      /* Set up ASIC #1 */
      H3800_ASIC1_GPIO_DIR          = ASIC1_OUTPUTS;      /* All outputs */
      H3800_ASIC1_GPIO_MASK         = ASIC1_OUTPUTS;      /* No interrupts */
      H3800_ASIC1_GPIO_SLEEP_MASK   = ASIC1_OUTPUTS;
      H3800_ASIC1_GPIO_SLEEP_DIR    = ASIC1_OUTPUTS;
      H3800_ASIC1_GPIO_SLEEP_OUT    = GPIO1_EAR_ON_N;
      H3800_ASIC1_GPIO_BATT_FAULT_DIR = ASIC1_OUTPUTS;
      H3800_ASIC1_GPIO_BATT_FAULT_OUT = GPIO1_EAR_ON_N;

      H3800_ASIC1_GPIO_OUT = GPIO1_IR_ON_N
                              | GPIO1_RS232_ON
                              | GPIO1_EAR_ON_N;

      /* Set up ASIC #2 */
      H3800_ASIC2_GPIOPIOD    = GPIO2_IN_Y1_N | GPIO2_IN_X1_N;
      H3800_ASIC2_GPOBFSTAT   = GPIO2_IN_Y1_N | GPIO2_IN_X1_N;

      H3800_ASIC2_GPIODIR     = GPIO2_PEN_IRQ
                              | GPIO2_SD_DETECT
                              | GPIO2_EAR_IN_N
                              | GPIO2_USB_DETECT_N
                              | GPIO2_SD_CON_SLT;

      /* TODO : Set sleep states & battery fault states */

      /* Clear VPP Enable */
      H3800_ASIC2_FlashWP_VPP_ON = 0;
      ipaq_model_ops = h3800_model_ops;
}

MACHINE_START(H3800, "Compaq iPAQ H3800")
      .phys_io    = 0x80000000,
      .io_pg_offst      = ((0xf8000000) >> 18) & 0xfffc,
      .boot_params      = 0xc0000100,
      .map_io           = h3800_map_io,
      .init_irq   = h3800_init_irq,
      .timer            = &sa1100_timer,
      .init_machine     = h3xxx_mach_init,
MACHINE_END

#endif /* CONFIG_SA1100_H3800 */

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