drivers/parisc/lasi.c

   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/irq.h>
  20 #include <linux/slab.h>
  21 #include <linux/module.h>
  22 #include <linux/pm.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/hardware.h>
  28 #include <asm/led.h>
  29
  30 #include "gsc.h"
  31
  32
  33 #define LASI_VER        0xC008  /* LASI Version */
  34
  35 #define LASI_IO_CONF    0x7FFFE /* LASI primary configuration register */
  36 #define LASI_IO_CONF2   0x7FFFF /* LASI secondary configuration register */
  37
  38 static int lasi_choose_irq(struct parisc_device *dev)
  39 {
  40         int irq;
  41
  42         /*
  43         ** "irq" bits below are numbered relative to most significant bit.
  44         */
  45         switch (dev->id.sversion) {
  46                 case 0x74:      irq = 24; break; /* Centronics */
  47                 case 0x7B:      irq = 18; break; /* Audio */
  48                 case 0x81:      irq = 17; break; /* Lasi itself */
  49                 case 0x82:      irq = 22; break; /* SCSI */
  50                 case 0x83:      irq = 11; break; /* Floppy */
  51                 case 0x84:      irq =  5; break; /* PS/2 Keyboard */
  52                 case 0x87:      irq = 13; break; /* ISDN */
  53                 case 0x8A:      irq = 23; break; /* LAN */
  54                 case 0x8C:      irq = 26; break; /* RS232 */
  55                 case 0x8D:      irq = (dev->hw_path == 13) ? 15 : 14;
  56                                                 break; /* Telephone */
  57                 default:        irq = -1; break; /* unknown */
  58         }
  59
  60         return irq;
  61 }
  62
  63 static void __init
  64 lasi_init_irq(struct busdevice *this_lasi)
  65 {
  66         unsigned long lasi_base = this_lasi->hpa;
  67
  68         /* Stop LASI barking for a bit */
  69         gsc_writel(0x00000000, lasi_base+OFFSET_IMR);
  70
  71         /* clear pending interrupts */
  72         gsc_readl(lasi_base+OFFSET_IRR);
  73
  74         /* We're not really convinced we want to reset the onboard
  75          * devices. Firmware does it for us...
  76          */
  77
  78         /* Resets */
  79         /* gsc_writel(0xFFFFFFFF, lasi_base+0x2000);*/  /* Parallel */
  80         if(pdc_add_valid(lasi_base+0x4004) == PDC_OK)
  81                 gsc_writel(0xFFFFFFFF, lasi_base+0x4004);       /* Audio */
  82         /* gsc_writel(0xFFFFFFFF, lasi_base+0x5000);*/  /* Serial */
  83         /* gsc_writel(0xFFFFFFFF, lasi_base+0x6000);*/  /* SCSI */
  84         gsc_writel(0xFFFFFFFF, lasi_base+0x7000);       /* LAN */
  85         gsc_writel(0xFFFFFFFF, lasi_base+0x8000);       /* Keyboard */
  86         gsc_writel(0xFFFFFFFF, lasi_base+0xA000);       /* FDC */
  87
  88         /* Ok we hit it on the head with a hammer, our Dog is now
  89         ** comatose and muzzled.  Devices will now unmask LASI
  90         ** interrupts as they are registered as irq's in the LASI range.
  91         */
  92         /* XXX: I thought it was `awks that got `it on the `ead with an
  93          * `ammer.  -- willy
  94          */
  95 }
  96
  97
  98 /*
  99    ** lasi_led_init()
 100    **
 101    ** lasi_led_init() initializes the LED controller on the LASI.
 102    **
 103    ** Since Mirage and Electra machines use a different LED
 104    ** address register, we need to check for these machines
 105    ** explicitly.
 106  */
 107
 108 #ifndef CONFIG_CHASSIS_LCD_LED
 109
 110 #define lasi_led_init(x)        /* nothing */
 111
 112 #else
 113
 114 void __init lasi_led_init(unsigned long lasi_hpa)
 115 {
 116         unsigned long datareg;
 117
 118         switch (CPU_HVERSION) {
 119         /* Gecko machines have only one single LED, which can be permanently
 120            turned on by writing a zero into the power control register. */
 121         case 0x600:             /* Gecko (712/60) */
 122         case 0x601:             /* Gecko (712/80) */
 123         case 0x602:             /* Gecko (712/100) */
 124         case 0x603:             /* Anole 64 (743/64) */
 125         case 0x604:             /* Anole 100 (743/100) */
 126         case 0x605:             /* Gecko (712/120) */
 127                 datareg = lasi_hpa + 0x0000C000;
 128                 gsc_writeb(0, datareg);
 129                 return; /* no need to register the LED interrupt-function */
 130
 131         /* Mirage and Electra machines need special offsets */
 132         case 0x60A:             /* Mirage Jr (715/64) */
 133         case 0x60B:             /* Mirage 100 */
 134         case 0x60C:             /* Mirage 100+ */
 135         case 0x60D:             /* Electra 100 */
 136         case 0x60E:             /* Electra 120 */
 137                 datareg = lasi_hpa - 0x00020000;
 138                 break;
 139
 140         default:
 141                 datareg = lasi_hpa + 0x0000C000;
 142                 break;
 143         }
 144
 145         register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, (char *)datareg);
 146 }
 147 #endif
 148
 149 /*
 150  * lasi_power_off
 151  *
 152  * Function for lasi to turn off the power.  This is accomplished by setting a
 153  * 1 to PWR_ON_L in the Power Control Register
 154  *
 155  */
 156
 157 static unsigned long lasi_power_off_hpa;
 158
 159 static void lasi_power_off(void)
 160 {
 161         unsigned long datareg;
 162
 163         /* calculate addr of the Power Control Register */
 164         datareg = lasi_power_off_hpa + 0x0000C000;
 165
 166         /* Power down the machine */
 167         gsc_writel(0x02, datareg);
 168 }
 169
 170 int __init
 171 lasi_init_chip(struct parisc_device *dev)
 172 {
 173         struct busdevice *lasi;
 174         struct gsc_irq gsc_irq;
 175         int irq, ret;
 176
 177         lasi = kmalloc(sizeof(struct busdevice), GFP_KERNEL);
 178         if (!lasi)
 179                 return -ENOMEM;
 180
 181         lasi->name = "Lasi";
 182         lasi->hpa = dev->hpa;
 183
 184         /* Check the 4-bit (yes, only 4) version register */
 185         lasi->version = gsc_readl(lasi->hpa + LASI_VER) & 0xf;
 186         printk(KERN_INFO "%s version %d at 0x%lx found.\n",
 187                 lasi->name, lasi->version, lasi->hpa);
 188
 189         /* initialize the chassis LEDs really early */
 190         lasi_led_init(lasi->hpa);
 191
 192         /* Stop LASI barking for a bit */
 193         lasi_init_irq(lasi);
 194
 195         /* the IRQ lasi should use */
 196         irq = gsc_alloc_irq(&gsc_irq);
 197         if (irq < 0) {
 198                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
 199                                 __FUNCTION__);
 200                 kfree(lasi);
 201                 return -EBUSY;
 202         }
 203
 204         ret = request_irq(gsc_irq.irq, busdev_barked, 0, "lasi", lasi);
 205         if (ret < 0) {
 206                 kfree(lasi);
 207                 return ret;
 208         }
 209
 210         /* Save this for debugging later */
 211         lasi->parent_irq = gsc_irq.irq;
 212         lasi->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 213
 214         /* enable IRQ's for devices below LASI */
 215         gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);
 216
 217         /* Done init'ing, register this driver */
 218         ret = gsc_common_irqsetup(dev, lasi);
 219         if (ret) {
 220                 kfree(lasi);
 221                 return ret;
 222         }
 223
 224         fixup_child_irqs(dev, lasi->busdev_region->data.irqbase,
 225                         lasi_choose_irq);
 226
 227         /* initialize the power off function */
 228         /* FIXME: Record the LASI HPA for the power off function.  This should
 229          * ensure that only the first LASI (the one controlling the power off)
 230          * should set the HPA here */
 231         lasi_power_off_hpa = lasi->hpa;
 232         pm_power_off = lasi_power_off;
 233
 234         return ret;
 235 }
 236
 237 static struct parisc_device_id lasi_tbl[] = {
 238         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00081 },
 239         { 0, }
 240 };
 241
 242 struct parisc_driver lasi_driver = {
 243         .name =         "Lasi",
 244         .id_table =     lasi_tbl,
 245         .probe =        lasi_init_chip,
 246 };