drivers/parisc/lasi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      LASI Device Driver
   4  *
   5  *      (c) Copyright 1999 Red Hat Software
   6  *      Portions (c) Copyright 1999 The Puffin Group Inc.
   7  *      Portions (c) Copyright 1999 Hewlett-Packard
   8  *
   9  *      by Alan Cox <alan@redhat.com> and
  10  *         Alex deVries <alex@onefishtwo.ca>
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/pm.h>
  19 #include <linux/types.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/hardware.h>
  23 #include <asm/led.h>
  24
  25 #include "gsc.h"
  26
  27
  28 #define LASI_VER        0xC008  /* LASI Version */
  29
  30 #define LASI_IO_CONF    0x7FFFE /* LASI primary configuration register */
  31 #define LASI_IO_CONF2   0x7FFFF /* LASI secondary configuration register */
  32
  33 static void lasi_choose_irq(struct parisc_device *dev, void *ctrl)
  34 {
  35         int irq;
  36
  37         switch (dev->id.sversion) {
  38                 case 0x74:      irq =  7; break; /* Centronics */
  39                 case 0x7B:      irq = 13; break; /* Audio */
  40                 case 0x81:      irq = 14; break; /* Lasi itself */
  41                 case 0x82:      irq =  9; break; /* SCSI */
  42                 case 0x83:      irq = 20; break; /* Floppy */
  43                 case 0x84:      irq = 26; break; /* PS/2 Keyboard */
  44                 case 0x87:      irq = 18; break; /* ISDN */
  45                 case 0x8A:      irq =  8; break; /* LAN */
  46                 case 0x8C:      irq =  5; break; /* RS232 */
  47                 case 0x8D:      irq = (dev->hw_path == 13) ? 16 : 17; break;
  48                                                  /* Telephone */
  49                 default:        return;          /* unknown */
  50         }
  51
  52         gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  53 }
  54
  55 static void __init
  56 lasi_init_irq(struct gsc_asic *this_lasi)
  57 {
  58         unsigned long lasi_base = this_lasi->hpa;
  59
  60         /* Stop LASI barking for a bit */
  61         gsc_writel(0x00000000, lasi_base+OFFSET_IMR);
  62
  63         /* clear pending interrupts */
  64         gsc_readl(lasi_base+OFFSET_IRR);
  65
  66         /* We're not really convinced we want to reset the onboard
  67          * devices. Firmware does it for us...
  68          */
  69
  70         /* Resets */
  71         /* gsc_writel(0xFFFFFFFF, lasi_base+0x2000);*/  /* Parallel */
  72         if(pdc_add_valid(lasi_base+0x4004) == PDC_OK)
  73                 gsc_writel(0xFFFFFFFF, lasi_base+0x4004);       /* Audio */
  74         /* gsc_writel(0xFFFFFFFF, lasi_base+0x5000);*/  /* Serial */
  75         /* gsc_writel(0xFFFFFFFF, lasi_base+0x6000);*/  /* SCSI */
  76         gsc_writel(0xFFFFFFFF, lasi_base+0x7000);       /* LAN */
  77         gsc_writel(0xFFFFFFFF, lasi_base+0x8000);       /* Keyboard */
  78         gsc_writel(0xFFFFFFFF, lasi_base+0xA000);       /* FDC */
  79
  80         /* Ok we hit it on the head with a hammer, our Dog is now
  81         ** comatose and muzzled.  Devices will now unmask LASI
  82         ** interrupts as they are registered as irq's in the LASI range.
  83         */
  84         /* XXX: I thought it was `awks that got `it on the `ead with an
  85          * `ammer.  -- willy
  86          */
  87 }
  88
  89
  90 /*
  91    ** lasi_led_init()
  92    **
  93    ** lasi_led_init() initializes the LED controller on the LASI.
  94    **
  95    ** Since Mirage and Electra machines use a different LED
  96    ** address register, we need to check for these machines
  97    ** explicitly.
  98  */
  99
 100 #ifndef CONFIG_CHASSIS_LCD_LED
 101
 102 #define lasi_led_init(x)        /* nothing */
 103
 104 #else
 105
 106 static void __init lasi_led_init(unsigned long lasi_hpa)
 107 {
 108         unsigned long datareg;
 109
 110         switch (CPU_HVERSION) {
 111         /* Gecko machines have only one single LED, which can be permanently
 112            turned on by writing a zero into the power control register. */
 113         case 0x600:             /* Gecko (712/60) */
 114         case 0x601:             /* Gecko (712/80) */
 115         case 0x602:             /* Gecko (712/100) */
 116         case 0x603:             /* Anole 64 (743/64) */
 117         case 0x604:             /* Anole 100 (743/100) */
 118         case 0x605:             /* Gecko (712/120) */
 119                 datareg = lasi_hpa + 0x0000C000;
 120                 gsc_writeb(0, datareg);
 121                 return; /* no need to register the LED interrupt-function */
 122
 123         /* Mirage and Electra machines need special offsets */
 124         case 0x60A:             /* Mirage Jr (715/64) */
 125         case 0x60B:             /* Mirage 100 */
 126         case 0x60C:             /* Mirage 100+ */
 127         case 0x60D:             /* Electra 100 */
 128         case 0x60E:             /* Electra 120 */
 129                 datareg = lasi_hpa - 0x00020000;
 130                 break;
 131
 132         default:
 133                 datareg = lasi_hpa + 0x0000C000;
 134                 break;
 135         }
 136
 137         register_led_driver(DISPLAY_MODEL_LASI, LED_CMD_REG_NONE, datareg);
 138 }
 139 #endif
 140
 141 /*
 142  * lasi_power_off
 143  *
 144  * Function for lasi to turn off the power.  This is accomplished by setting a
 145  * 1 to PWR_ON_L in the Power Control Register
 146  *
 147  */
 148
 149 static unsigned long lasi_power_off_hpa __read_mostly;
 150
 151 static void lasi_power_off(void)
 152 {
 153         unsigned long datareg;
 154
 155         /* calculate addr of the Power Control Register */
 156         datareg = lasi_power_off_hpa + 0x0000C000;
 157
 158         /* Power down the machine */
 159         gsc_writel(0x02, datareg);
 160 }
 161
 162 static int __init lasi_init_chip(struct parisc_device *dev)
 163 {
 164         extern void (*chassis_power_off)(void);
 165         struct gsc_asic *lasi;
 166         struct gsc_irq gsc_irq;
 167         int ret;
 168
 169         lasi = kzalloc(sizeof(*lasi), GFP_KERNEL);
 170         if (!lasi)
 171                 return -ENOMEM;
 172
 173         lasi->name = "Lasi";
 174         lasi->hpa = dev->hpa.start;
 175
 176         /* Check the 4-bit (yes, only 4) version register */
 177         lasi->version = gsc_readl(lasi->hpa + LASI_VER) & 0xf;
 178         printk(KERN_INFO "%s version %d at 0x%lx found.\n",
 179                 lasi->name, lasi->version, lasi->hpa);
 180
 181         /* initialize the chassis LEDs really early */
 182         lasi_led_init(lasi->hpa);
 183
 184         /* Stop LASI barking for a bit */
 185         lasi_init_irq(lasi);
 186
 187         /* the IRQ lasi should use */
 188         dev->irq = gsc_alloc_irq(&gsc_irq);
 189         if (dev->irq < 0) {
 190                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
 191                                 __func__);
 192                 kfree(lasi);
 193                 return -EBUSY;
 194         }
 195
 196         lasi->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
 197
 198         ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "lasi", lasi);
 199         if (ret < 0) {
 200                 kfree(lasi);
 201                 return ret;
 202         }
 203
 204         /* enable IRQ's for devices below LASI */
 205         gsc_writel(lasi->eim, lasi->hpa + OFFSET_IAR);
 206
 207         /* Done init'ing, register this driver */
 208         ret = gsc_common_setup(dev, lasi);
 209         if (ret) {
 210                 kfree(lasi);
 211                 return ret;
 212         }
 213
 214         gsc_fixup_irqs(dev, lasi, lasi_choose_irq);
 215
 216         /* initialize the power off function */
 217         /* FIXME: Record the LASI HPA for the power off function.  This should
 218          * ensure that only the first LASI (the one controlling the power off)
 219          * should set the HPA here */
 220         lasi_power_off_hpa = lasi->hpa;
 221         chassis_power_off = lasi_power_off;
 222
 223         return ret;
 224 }
 225
 226 static struct parisc_device_id lasi_tbl[] __initdata = {
 227         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00081 },
 228         { 0, }
 229 };
 230
 231 struct parisc_driver lasi_driver __refdata = {
 232         .name =         "lasi",
 233         .id_table =     lasi_tbl,
 234         .probe =        lasi_init_chip,
 235 };