/*
   *	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.
  ",
  		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
  ",
  				__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,
  };