/*
 *      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 <alex@onefishtwo.ca>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/types.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/led.h>

#include "gsc.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 void lasi_choose_irq(struct parisc_device *dev, void *ctrl)
{
        int irq;

        switch (dev->id.sversion) {
                case 0x74:      irq =  7; break; /* Centronics */
                case 0x7B:      irq = 13; break; /* Audio */
                case 0x81:      irq = 14; break; /* Lasi itself */
                case 0x82:      irq =  9; break; /* SCSI */
                case 0x83:      irq = 20; break; /* Floppy */
                case 0x84:      irq = 26; break; /* PS/2 Keyboard */
                case 0x87:      irq = 18; break; /* ISDN */
                case 0x8A:      irq =  8; break; /* LAN */
                case 0x8C:      irq =  5; break; /* RS232 */
                case 0x8D:      irq = (dev->hw_path == 13) ? 16 : 17; break;
                                                 /* Telephone */
                default:        return;          /* unknown */
        }

        gsc_asic_assign_irq(ctrl, irq, &dev->irq);
}

static void __init
lasi_init_irq(struct gsc_asic *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

static 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;
        }

        register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, 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 __read_mostly;

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);
}

static int __init lasi_init_chip(struct parisc_device *dev)
{
        extern void (*chassis_power_off)(void);
        struct gsc_asic *lasi;
        struct gsc_irq gsc_irq;
        int ret;

        lasi = kzalloc(sizeof(*lasi), GFP_KERNEL);
        if (!lasi)
                return -ENOMEM;

        lasi->name = "Lasi";
        lasi->hpa = dev->hpa.start;

        /* 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 */
        dev->irq = gsc_alloc_irq(&gsc_irq);
        if (dev->irq < 0) {
                printk(KERN_ERR "%s(): cannot get GSC irq\n",
                                __func__);
                kfree(lasi);
                return -EBUSY;
        }

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

        ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "lasi", lasi);
        if (ret < 0) {
                kfree(lasi);
                return ret;
        }

        /* enable IRQ's for devices below LASI */
        gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);

        /* Done init'ing, register this driver */
        ret = gsc_common_setup(dev, lasi);
        if (ret) {
                kfree(lasi);
                return ret;
        }    

        gsc_fixup_irqs(dev, lasi, 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;
        chassis_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,
};