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/*

 *      LASI Device Driver

 *

 *      (c) Copyright 1999 Red Hat Software

 *      Portions (c) Copyright 1999 The Puffin Group Inc.

 *      Portions (c) Copyright 1999 Hewlett-Packard

 *

 *      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.

 *

 *      by Alan Cox <alan@redhat.com> and

 *         Alex deVries <adevries@thepuffingroup.com>

 */

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/irq.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/pm.h>

#include <linux/slab.h>

#include <linux/types.h>

#include <asm/gsc.h>

#include <asm/hardware.h>

#include <asm/led.h>

#include <asm/pdc.h>

#include "busdevice.h"

#define LASI_VER        0xC008  /* LASI Version */

#define LASI_IO_CONF    0x7FFFE /* LASI primary configuration register */

#define LASI_IO_CONF2   0x7FFFF /* LASI secondary configuration register */

static int lasi_choose_irq(struct parisc_device *dev)

{

        int irq;

        /*

        ** "irq" bits below are numbered relative to most significant bit.

        */

        switch (dev->id.sversion) {

                case 0x74:      irq = 24; break; /* Centronics */

                case 0x7B:      irq = 18; break; /* Audio */

                case 0x81:      irq = 17; break; /* Lasi itself */

                case 0x82:      irq = 22; break; /* SCSI */

                case 0x83:      irq = 11; break; /* Floppy */

                case 0x84:      irq =  5; break; /* PS/2 Keyboard */

                case 0x87:      irq = 13; break; /* ISDN */

                case 0x8A:      irq = 23; break; /* LAN */

                case 0x8C:      irq = 26; break; /* RS232 */

                case 0x8D:      irq = (dev->hw_path == 13) ? 15 : 14;

                                                break; /* Telephone */

                default:        irq = -1; break; /* unknown */

        }

        return irq;

}

static void __init

lasi_init_irq(struct busdevice *this_lasi)

{

        unsigned long lasi_base = this_lasi->hpa;

        /* Stop LASI barking for a bit */

        gsc_writel(0x00000000, lasi_base+OFFSET_IMR);

        /* clear pending interrupts */

        gsc_readl(lasi_base+OFFSET_IRR);

        /* We're not really convinced we want to reset the onboard

         * devices. Firmware does it for us...

         */

        /* Resets */

        /* gsc_writel(0xFFFFFFFF, lasi_base+0x2000);*/  /* Parallel */

        if(pdc_add_valid(lasi_base+0x4004) == PDC_OK)

                gsc_writel(0xFFFFFFFF, lasi_base+0x4004);       /* Audio */

        /* gsc_writel(0xFFFFFFFF, lasi_base+0x5000);*/  /* Serial */

        /* gsc_writel(0xFFFFFFFF, lasi_base+0x6000);*/  /* SCSI */

        gsc_writel(0xFFFFFFFF, lasi_base+0x7000);       /* LAN */

        gsc_writel(0xFFFFFFFF, lasi_base+0x8000);       /* Keyboard */

        gsc_writel(0xFFFFFFFF, lasi_base+0xA000);       /* FDC */

        /* Ok we hit it on the head with a hammer, our Dog is now

        ** comatose and muzzled.  Devices will now unmask LASI

        ** interrupts as they are registered as irq's in the LASI range.

        */

        /* XXX: I thought it was `awks that got `it on the `ead with an

         * `ammer.  -- willy

         */

}

/*

   ** lasi_led_init()

   **

   ** lasi_led_init() initializes the LED controller on the LASI.

   **

   ** Since Mirage and Electra machines use a different LED

   ** address register, we need to check for these machines

   ** explicitly.

 */

#ifndef CONFIG_CHASSIS_LCD_LED

#define lasi_led_init(x)        /* nothing */

#else

void __init lasi_led_init(unsigned long lasi_hpa)

{

        unsigned long datareg;

        switch (CPU_HVERSION) {

        /* Gecko machines have only one single LED, which can be permanently

           turned on by writing a zero into the power control register. */

        case 0x600:             /* Gecko (712/60) */

        case 0x601:             /* Gecko (712/80) */

        case 0x602:             /* Gecko (712/100) */

        case 0x603:             /* Anole 64 (743/64) */

        case 0x604:             /* Anole 100 (743/100) */

        case 0x605:             /* Gecko (712/120) */

                datareg = lasi_hpa + 0x0000C000;

                gsc_writeb(0, datareg);

                return; /* no need to register the LED interrupt-function */

        /* Mirage and Electra machines need special offsets */

        case 0x60A:             /* Mirage Jr (715/64) */

        case 0x60B:             /* Mirage 100 */

        case 0x60C:             /* Mirage 100+ */

        case 0x60D:             /* Electra 100 */

        case 0x60E:             /* Electra 120 */

                datareg = lasi_hpa - 0x00020000;

                break;

        default:

                datareg = lasi_hpa + 0x0000C000;

                break;

        } /* switch() */

        register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, (char *)datareg);

}

#endif

/*

 * lasi_power_off

 *

 * Function for lasi to turn off the power.  This is accomplished by setting a

 * 1 to PWR_ON_L in the Power Control Register

 *

 */

static unsigned long lasi_power_off_hpa;

static void lasi_power_off(void)

{

        unsigned long datareg;

        /* calculate addr of the Power Control Register */

        datareg = lasi_power_off_hpa + 0x0000C000;

        /* Power down the machine */

        gsc_writel(0x02, datareg);

}

int __init

lasi_init_chip(struct parisc_device *dev)

{

        struct busdevice *lasi;

        struct gsc_irq gsc_irq;

        int irq, ret;

        lasi = kmalloc(sizeof(struct busdevice), GFP_KERNEL);

        if (!lasi)

                return -ENOMEM;

        lasi->name = "Lasi";

        lasi->hpa = dev->hpa;

        /* Check the 4-bit (yes, only 4) version register */

        lasi->version = gsc_readl(lasi->hpa + LASI_VER) & 0xf;

        printk(KERN_INFO "%s version %d at 0x%lx found.\n",

                lasi->name, lasi->version, lasi->hpa);

        /* initialize the chassis LEDs really early */

        lasi_led_init(lasi->hpa);

        /* Stop LASI barking for a bit */

        lasi_init_irq(lasi);

        /* the IRQ lasi should use */

        irq = gsc_alloc_irq(&gsc_irq);

        if (irq < 0) {

                printk(KERN_ERR "%s(): cannot get GSC irq\n",

                                __FUNCTION__);

                kfree(lasi);

                return -EBUSY;

        }

        ret = request_irq(gsc_irq.irq, busdev_barked, 0, "lasi", lasi);

        if (ret < 0) {

                kfree(lasi);

                return ret;

        }

        /* Save this for debugging later */

        lasi->parent_irq = gsc_irq.irq;

        lasi->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;

        /* enable IRQ's for devices below LASI */

        gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);

        /* Done init'ing, register this driver */

        ret = gsc_common_irqsetup(dev, lasi);

        if (ret) {

                kfree(lasi);

                return ret;

        }

        fixup_child_irqs(dev, lasi->busdev_region->data.irqbase,

                        lasi_choose_irq);

        /* initialize the power off function */

        /* FIXME: Record the LASI HPA for the power off function.  This should

         * ensure that only the first LASI (the one controlling the power off)

         * should set the HPA here */

        lasi_power_off_hpa = lasi->hpa;

        pm_power_off = lasi_power_off;

        return ret;

}

static struct parisc_device_id lasi_tbl[] = {

        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00081 },

        { 0, }

};

struct parisc_driver lasi_driver = {

        name:           "Lasi",

        id_table:       lasi_tbl,

        probe:          lasi_init_chip,

};