linux/drivers/parisc/lasi.c
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   1/*
   2 *      LASI Device Driver
   3 *
   4 *      (c) Copyright 1999 Red Hat Software
   5 *      Portions (c) Copyright 1999 The Puffin Group Inc.
   6 *      Portions (c) Copyright 1999 Hewlett-Packard
   7 *
   8 *      This program is free software; you can redistribute it and/or modify
   9 *      it under the terms of the GNU General Public License as published by
  10 *      the Free Software Foundation; either version 2 of the License, or
  11 *      (at your option) any later version.
  12 *
  13 *      by Alan Cox <alan@redhat.com> and 
  14 *         Alex deVries <alex@onefishtwo.ca>
  15 */
  16
  17#include <linux/errno.h>
  18#include <linux/init.h>
  19#include <linux/interrupt.h>
  20#include <linux/slab.h>
  21#include <linux/module.h>
  22#include <linux/pm.h>
  23#include <linux/types.h>
  24
  25#include <asm/io.h>
  26#include <asm/hardware.h>
  27#include <asm/led.h>
  28
  29#include "gsc.h"
  30
  31
  32#define LASI_VER        0xC008  /* LASI Version */
  33
  34#define LASI_IO_CONF    0x7FFFE /* LASI primary configuration register */
  35#define LASI_IO_CONF2   0x7FFFF /* LASI secondary configuration register */
  36
  37static void lasi_choose_irq(struct parisc_device *dev, void *ctrl)
  38{
  39        int irq;
  40
  41        switch (dev->id.sversion) {
  42                case 0x74:      irq =  7; break; /* Centronics */
  43                case 0x7B:      irq = 13; break; /* Audio */
  44                case 0x81:      irq = 14; break; /* Lasi itself */
  45                case 0x82:      irq =  9; break; /* SCSI */
  46                case 0x83:      irq = 20; break; /* Floppy */
  47                case 0x84:      irq = 26; break; /* PS/2 Keyboard */
  48                case 0x87:      irq = 18; break; /* ISDN */
  49                case 0x8A:      irq =  8; break; /* LAN */
  50                case 0x8C:      irq =  5; break; /* RS232 */
  51                case 0x8D:      irq = (dev->hw_path == 13) ? 16 : 17; break;
  52                                                 /* Telephone */
  53                default:        return;          /* unknown */
  54        }
  55
  56        gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  57}
  58
  59static void __init
  60lasi_init_irq(struct gsc_asic *this_lasi)
  61{
  62        unsigned long lasi_base = this_lasi->hpa;
  63
  64        /* Stop LASI barking for a bit */
  65        gsc_writel(0x00000000, lasi_base+OFFSET_IMR);
  66
  67        /* clear pending interrupts */
  68        gsc_readl(lasi_base+OFFSET_IRR);
  69
  70        /* We're not really convinced we want to reset the onboard
  71         * devices. Firmware does it for us...
  72         */
  73
  74        /* Resets */
  75        /* gsc_writel(0xFFFFFFFF, lasi_base+0x2000);*/  /* Parallel */
  76        if(pdc_add_valid(lasi_base+0x4004) == PDC_OK)
  77                gsc_writel(0xFFFFFFFF, lasi_base+0x4004);       /* Audio */
  78        /* gsc_writel(0xFFFFFFFF, lasi_base+0x5000);*/  /* Serial */ 
  79        /* gsc_writel(0xFFFFFFFF, lasi_base+0x6000);*/  /* SCSI */
  80        gsc_writel(0xFFFFFFFF, lasi_base+0x7000);       /* LAN */
  81        gsc_writel(0xFFFFFFFF, lasi_base+0x8000);       /* Keyboard */
  82        gsc_writel(0xFFFFFFFF, lasi_base+0xA000);       /* FDC */
  83        
  84        /* Ok we hit it on the head with a hammer, our Dog is now
  85        ** comatose and muzzled.  Devices will now unmask LASI
  86        ** interrupts as they are registered as irq's in the LASI range.
  87        */
  88        /* XXX: I thought it was `awks that got `it on the `ead with an
  89         * `ammer.  -- willy
  90         */
  91}
  92
  93
  94/*
  95   ** lasi_led_init()
  96   ** 
  97   ** lasi_led_init() initializes the LED controller on the LASI.
  98   **
  99   ** Since Mirage and Electra machines use a different LED
 100   ** address register, we need to check for these machines 
 101   ** explicitly.
 102 */
 103
 104#ifndef CONFIG_CHASSIS_LCD_LED
 105
 106#define lasi_led_init(x)        /* nothing */
 107
 108#else
 109
 110static void __init lasi_led_init(unsigned long lasi_hpa)
 111{
 112        unsigned long datareg;
 113
 114        switch (CPU_HVERSION) {
 115        /* Gecko machines have only one single LED, which can be permanently 
 116           turned on by writing a zero into the power control register. */ 
 117        case 0x600:             /* Gecko (712/60) */
 118        case 0x601:             /* Gecko (712/80) */
 119        case 0x602:             /* Gecko (712/100) */
 120        case 0x603:             /* Anole 64 (743/64) */
 121        case 0x604:             /* Anole 100 (743/100) */
 122        case 0x605:             /* Gecko (712/120) */
 123                datareg = lasi_hpa + 0x0000C000;
 124                gsc_writeb(0, datareg);
 125                return; /* no need to register the LED interrupt-function */  
 126
 127        /* Mirage and Electra machines need special offsets */
 128        case 0x60A:             /* Mirage Jr (715/64) */
 129        case 0x60B:             /* Mirage 100 */
 130        case 0x60C:             /* Mirage 100+ */
 131        case 0x60D:             /* Electra 100 */
 132        case 0x60E:             /* Electra 120 */
 133                datareg = lasi_hpa - 0x00020000;
 134                break;
 135
 136        default:
 137                datareg = lasi_hpa + 0x0000C000;
 138                break;
 139        }
 140
 141        register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, datareg);
 142}
 143#endif
 144
 145/*
 146 * lasi_power_off
 147 *
 148 * Function for lasi to turn off the power.  This is accomplished by setting a
 149 * 1 to PWR_ON_L in the Power Control Register
 150 * 
 151 */
 152
 153static unsigned long lasi_power_off_hpa __read_mostly;
 154
 155static void lasi_power_off(void)
 156{
 157        unsigned long datareg;
 158
 159        /* calculate addr of the Power Control Register */
 160        datareg = lasi_power_off_hpa + 0x0000C000;
 161
 162        /* Power down the machine */
 163        gsc_writel(0x02, datareg);
 164}
 165
 166static int __init lasi_init_chip(struct parisc_device *dev)
 167{
 168        extern void (*chassis_power_off)(void);
 169        struct gsc_asic *lasi;
 170        struct gsc_irq gsc_irq;
 171        int ret;
 172
 173        lasi = kzalloc(sizeof(*lasi), GFP_KERNEL);
 174        if (!lasi)
 175                return -ENOMEM;
 176
 177        lasi->name = "Lasi";
 178        lasi->hpa = dev->hpa.start;
 179
 180        /* Check the 4-bit (yes, only 4) version register */
 181        lasi->version = gsc_readl(lasi->hpa + LASI_VER) & 0xf;
 182        printk(KERN_INFO "%s version %d at 0x%lx found.\n",
 183                lasi->name, lasi->version, lasi->hpa);
 184
 185        /* initialize the chassis LEDs really early */ 
 186        lasi_led_init(lasi->hpa);
 187
 188        /* Stop LASI barking for a bit */
 189        lasi_init_irq(lasi);
 190
 191        /* the IRQ lasi should use */
 192        dev->irq = gsc_alloc_irq(&gsc_irq);
 193        if (dev->irq < 0) {
 194                printk(KERN_ERR "%s(): cannot get GSC irq\n",
 195                                __func__);
 196                kfree(lasi);
 197                return -EBUSY;
 198        }
 199
 200        lasi->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 201
 202        ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "lasi", lasi);
 203        if (ret < 0) {
 204                kfree(lasi);
 205                return ret;
 206        }
 207
 208        /* enable IRQ's for devices below LASI */
 209        gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);
 210
 211        /* Done init'ing, register this driver */
 212        ret = gsc_common_setup(dev, lasi);
 213        if (ret) {
 214                kfree(lasi);
 215                return ret;
 216        }    
 217
 218        gsc_fixup_irqs(dev, lasi, lasi_choose_irq);
 219
 220        /* initialize the power off function */
 221        /* FIXME: Record the LASI HPA for the power off function.  This should
 222         * ensure that only the first LASI (the one controlling the power off)
 223         * should set the HPA here */
 224        lasi_power_off_hpa = lasi->hpa;
 225        chassis_power_off = lasi_power_off;
 226        
 227        return ret;
 228}
 229
 230static struct parisc_device_id lasi_tbl[] = {
 231        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00081 },
 232        { 0, }
 233};
 234
 235struct parisc_driver lasi_driver = {
 236        .name =         "lasi",
 237        .id_table =     lasi_tbl,
 238        .probe =        lasi_init_chip,
 239};
 240
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