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h3xxx.c

/*
 * Support for Compaq iPAQ H3100 and H3600 handheld computers (common code)
 *
 * Copyright (c) 2000,1 Compaq Computer Corporation. (Author: Jamey Hicks)
 * Copyright (c) 2009 Dmitry Artamonow <mad_soft@inbox.ru>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/gpio.h>
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/mfd/htc-egpio.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>

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

#include <mach/h3xxx.h>

#include "generic.h"

void h3xxx_init_gpio(struct gpio_default_state *s, size_t n)
{
      while (n--) {
            const char *name = s->name;
            int err;

            if (!name)
                  name = "[init]";
            err = gpio_request(s->gpio, name);
            if (err) {
                  printk(KERN_ERR "gpio%u: unable to request: %d\n",
                        s->gpio, err);
                  continue;
            }
            if (s->mode >= 0) {
                  err = gpio_direction_output(s->gpio, s->mode);
            } else {
                  err = gpio_direction_input(s->gpio);
            }
            if (err) {
                  printk(KERN_ERR "gpio%u: unable to set direction: %d\n",
                        s->gpio, err);
                  continue;
            }
            if (!s->name)
                  gpio_free(s->gpio);
            s++;
      }
}


/*
 * H3xxx flash support
 */
static struct mtd_partition h3xxx_partitions[] = {
      {
            .name       = "H3XXX boot firmware",
            .size       = 0x00040000,
            .offset           = 0,
            .mask_flags = MTD_WRITEABLE,  /* force read-only */
      }, {
            .name       = "H3XXX rootfs",
            .size       = MTDPART_SIZ_FULL,
            .offset           = 0x00040000,
      }
};

static void h3xxx_set_vpp(int vpp)
{
      gpio_set_value(H3XXX_EGPIO_VPP_ON, vpp);
}

static int h3xxx_flash_init(void)
{
      int err = gpio_request(H3XXX_EGPIO_VPP_ON, "Flash Vpp");
      if (err) {
            pr_err("%s: can't request H3XXX_EGPIO_VPP_ON\n", __func__);
            return err;
      }

      err = gpio_direction_output(H3XXX_EGPIO_VPP_ON, 0);
      if (err)
            gpio_free(H3XXX_EGPIO_VPP_ON);

      return err;
}

static void h3xxx_flash_exit(void)
{
      gpio_free(H3XXX_EGPIO_VPP_ON);
}

static struct flash_platform_data h3xxx_flash_data = {
      .map_name   = "cfi_probe",
      .set_vpp    = h3xxx_set_vpp,
      .init       = h3xxx_flash_init,
      .exit       = h3xxx_flash_exit,
      .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,
};


/*
 * H3xxx uart support
 */
static void h3xxx_uart_set_mctrl(struct uart_port *port, u_int mctrl)
{
      if (port->mapbase == _Ser3UTCR0) {
            gpio_set_value(H3XXX_GPIO_COM_RTS, !(mctrl & TIOCM_RTS));
      }
}

static u_int h3xxx_uart_get_mctrl(struct uart_port *port)
{
      u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;

      if (port->mapbase == _Ser3UTCR0) {
            /*
             * DCD and CTS bits are inverted in GPLR by RS232 transceiver
             */
            if (gpio_get_value(H3XXX_GPIO_COM_DCD))
                  ret &= ~TIOCM_CD;
            if (gpio_get_value(H3XXX_GPIO_COM_CTS))
                  ret &= ~TIOCM_CTS;
      }

      return ret;
}

static void h3xxx_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
{
      if (port->mapbase == _Ser3UTCR0) {
            if (!gpio_request(H3XXX_EGPIO_RS232_ON, "RS232 transceiver")) {
                  gpio_direction_output(H3XXX_EGPIO_RS232_ON, !state);
                  gpio_free(H3XXX_EGPIO_RS232_ON);
            } else {
                  pr_err("%s: can't request H3XXX_EGPIO_RS232_ON\n",
                        __func__);
            }
      }
}

/*
 * Enable/Disable wake up events for this serial port.
 * Obviously, we only support this on the normal COM port.
 */
static int h3xxx_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 h3xxx_port_fns __initdata = {
      .set_mctrl  = h3xxx_uart_set_mctrl,
      .get_mctrl  = h3xxx_uart_get_mctrl,
      .pm         = h3xxx_uart_pm,
      .set_wake   = h3xxx_uart_set_wake,
};

/*
 * EGPIO
 */

static struct resource egpio_resources[] = {
      [0] = {
            .start      = H3600_EGPIO_PHYS,
            .end  = H3600_EGPIO_PHYS + 0x4 - 1,
            .flags      = IORESOURCE_MEM,
      },
};

static struct htc_egpio_chip egpio_chips[] = {
      [0] = {
            .reg_start  = 0,
            .gpio_base  = H3XXX_EGPIO_BASE,
            .num_gpios  = 16,
            .direction  = HTC_EGPIO_OUTPUT,
            .initial_values   = 0x0080, /* H3XXX_EGPIO_RS232_ON */
      },
};

static struct htc_egpio_platform_data egpio_info = {
      .reg_width  = 16,
      .bus_width  = 16,
      .chip       = egpio_chips,
      .num_chips  = ARRAY_SIZE(egpio_chips),
};

static struct platform_device h3xxx_egpio = {
      .name       = "htc-egpio",
      .id         = -1,
      .resource   = egpio_resources,
      .num_resources    = ARRAY_SIZE(egpio_resources),
      .dev        = {
            .platform_data = &egpio_info,
      },
};

/*
 * GPIO keys
 */

static struct gpio_keys_button h3xxx_button_table[] = {
      {
            .code       = KEY_POWER,
            .gpio       = H3XXX_GPIO_PWR_BUTTON,
            .desc       = "Power Button",
            .active_low = 1,
            .type       = EV_KEY,
            .wakeup           = 1,
      }, {
            .code       = KEY_ENTER,
            .gpio       = H3XXX_GPIO_ACTION_BUTTON,
            .active_low = 1,
            .desc       = "Action button",
            .type       = EV_KEY,
            .wakeup           = 0,
      },
};

static struct gpio_keys_platform_data h3xxx_keys_data = {
      .buttons  = h3xxx_button_table,
      .nbuttons = ARRAY_SIZE(h3xxx_button_table),
};

static struct platform_device h3xxx_keys = {
      .name = "gpio-keys",
      .id   = -1,
      .dev  = {
            .platform_data = &h3xxx_keys_data,
      },
};

static struct platform_device *h3xxx_devices[] = {
      &h3xxx_egpio,
      &h3xxx_keys,
};

void __init h3xxx_mach_init(void)
{
      sa1100_register_uart_fns(&h3xxx_port_fns);
      sa11x0_register_mtd(&h3xxx_flash_data, &h3xxx_flash_resource, 1);
      platform_add_devices(h3xxx_devices, ARRAY_SIZE(h3xxx_devices));
}

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
 */

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

      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;
      PCFR = PCFR_OPDE;
      PSDR = 0;

      GPCR = 0x0fffffff;      /* All outputs are set low by default */
      GPDR = 0;         /* Configure all GPIOs as input */
}


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