drivers/parisc/asp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      ASP Device Driver
   4  *
   5  *      (c) Copyright 2000 The Puffin Group Inc.
   6  *
   7  *      by Helge Deller <deller@gmx.de>
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <asm/io.h>
  16 #include <asm/led.h>
  17
  18 #include "gsc.h"
  19
  20 #define ASP_GSC_IRQ     3               /* hardcoded interrupt for GSC */
  21
  22 #define ASP_VER_OFFSET  0x20            /* offset of ASP version */
  23
  24 #define ASP_LED_ADDR    0xf0800020
  25
  26 #define VIPER_INT_WORD  0xFFFBF088      /* addr of viper interrupt word */
  27
  28 static struct gsc_asic asp;
  29
  30 static void asp_choose_irq(struct parisc_device *dev, void *ctrl)
  31 {
  32         int irq;
  33
  34         switch (dev->id.sversion) {
  35         case 0x71:      irq =  9; break; /* SCSI */
  36         case 0x72:      irq =  8; break; /* LAN */
  37         case 0x73:      irq =  1; break; /* HIL */
  38         case 0x74:      irq =  7; break; /* Centronics */
  39         case 0x75:      irq = (dev->hw_path == 4) ? 5 : 6; break; /* RS232 */
  40         case 0x76:      irq = 10; break; /* EISA BA */
  41         case 0x77:      irq = 11; break; /* Graphics1 */
  42         case 0x7a:      irq = 13; break; /* Audio (Bushmaster) */
  43         case 0x7b:      irq = 13; break; /* Audio (Scorpio) */
  44         case 0x7c:      irq =  3; break; /* FW SCSI */
  45         case 0x7d:      irq =  4; break; /* FDDI */
  46         case 0x7f:      irq = 13; break; /* Audio (Outfield) */
  47         default:        return;          /* Unknown */
  48         }
  49
  50         gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  51
  52         switch (dev->id.sversion) {
  53         case 0x73:      irq =  2; break; /* i8042 High-priority */
  54         case 0x76:      irq =  0; break; /* EISA BA */
  55         default:        return;          /* Other */
  56         }
  57
  58         gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
  59 }
  60
  61 /* There are two register ranges we're interested in.  Interrupt /
  62  * Status / LED are at 0xf080xxxx and Asp special registers are at
  63  * 0xf082fxxx.  PDC only tells us that Asp is at 0xf082f000, so for
  64  * the purposes of interrupt handling, we have to tell other bits of
  65  * the kernel to look at the other registers.
  66  */
  67 #define ASP_INTERRUPT_ADDR 0xf0800000
  68
  69 static int __init asp_init_chip(struct parisc_device *dev)
  70 {
  71         struct gsc_irq gsc_irq;
  72         int ret;
  73
  74         asp.version = gsc_readb(dev->hpa.start + ASP_VER_OFFSET) & 0xf;
  75         asp.name = (asp.version == 1) ? "Asp" : "Cutoff";
  76         asp.hpa = ASP_INTERRUPT_ADDR;
  77
  78         printk(KERN_INFO "%s version %d at 0x%lx found.\n",
  79                 asp.name, asp.version, (unsigned long)dev->hpa.start);
  80
  81         /* the IRQ ASP should use */
  82         ret = -EBUSY;
  83         dev->irq = gsc_claim_irq(&gsc_irq, ASP_GSC_IRQ);
  84         if (dev->irq < 0) {
  85                 printk(KERN_ERR "%s(): cannot get GSC irq\n", __func__);
  86                 goto out;
  87         }
  88
  89         asp.eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
  90
  91         ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "asp", &asp);
  92         if (ret < 0)
  93                 goto out;
  94
  95         /* Program VIPER to interrupt on the ASP irq */
  96         gsc_writel((1 << (31 - ASP_GSC_IRQ)),VIPER_INT_WORD);
  97
  98         /* Done init'ing, register this driver */
  99         ret = gsc_common_setup(dev, &asp);
 100         if (ret)
 101                 goto out;
 102
 103         gsc_fixup_irqs(dev, &asp, asp_choose_irq);
 104         /* Mongoose is a sibling of Asp, not a child... */
 105         gsc_fixup_irqs(parisc_parent(dev), &asp, asp_choose_irq);
 106
 107         /* initialize the chassis LEDs */
 108 #ifdef CONFIG_CHASSIS_LCD_LED
 109         register_led_driver(DISPLAY_MODEL_OLD_ASP, LED_CMD_REG_NONE,
 110                     ASP_LED_ADDR);
 111 #endif
 112
 113  out:
 114         return ret;
 115 }
 116
 117 static const struct parisc_device_id asp_tbl[] __initconst = {
 118         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00070 },
 119         { 0, }
 120 };
 121
 122 struct parisc_driver asp_driver __refdata = {
 123         .name =         "asp",
 124         .id_table =     asp_tbl,
 125         .probe =        asp_init_chip,
 126 };