h3xxx.c

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/*
 * 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 <[email protected]>
 *
 * 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 =
    DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M);


/*
 * 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] = DEFINE_RES_MEM(H3600_EGPIO_PHYS, 0x4),
};

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 */
}