drivers/parisc/wax.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      WAX 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/ioport.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17
  18 #include <asm/io.h>
  19 #include <asm/hardware.h>
  20
  21 #include "gsc.h"
  22
  23 #define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
  24
  25 static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
  26 {
  27         int irq;
  28
  29         switch (dev->id.sversion) {
  30                 case 0x73:      irq =  1; break; /* i8042 General */
  31                 case 0x8c:      irq =  6; break; /* Serial */
  32                 case 0x90:      irq = 10; break; /* EISA */
  33                 default:        return;          /* Unknown */
  34         }
  35
  36         gsc_asic_assign_irq(ctrl, irq, &dev->irq);
  37
  38         switch (dev->id.sversion) {
  39                 case 0x73:      irq =  2; break; /* i8042 High-priority */
  40                 case 0x90:      irq =  0; break; /* EISA NMI */
  41                 default:        return;          /* No secondary IRQ */
  42         }
  43
  44         gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
  45 }
  46
  47 static void __init
  48 wax_init_irq(struct gsc_asic *wax)
  49 {
  50         unsigned long base = wax->hpa;
  51
  52         /* Wax-off */
  53         gsc_writel(0x00000000, base+OFFSET_IMR);
  54
  55         /* clear pending interrupts */
  56         gsc_readl(base+OFFSET_IRR);
  57
  58         /* We're not really convinced we want to reset the onboard
  59          * devices. Firmware does it for us...
  60          */
  61
  62         /* Resets */
  63 //      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
  64 //      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
  65 }
  66
  67 static int __init wax_init_chip(struct parisc_device *dev)
  68 {
  69         struct gsc_asic *wax;
  70         struct parisc_device *parent;
  71         struct gsc_irq gsc_irq;
  72         int ret;
  73
  74         wax = kzalloc(sizeof(*wax), GFP_KERNEL);
  75         if (!wax)
  76                 return -ENOMEM;
  77
  78         wax->name = "wax";
  79         wax->hpa = dev->hpa.start;
  80
  81         wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
  82         printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
  83
  84         /* Stop wax hissing for a bit */
  85         wax_init_irq(wax);
  86
  87         /* the IRQ wax should use */
  88         dev->irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
  89         if (dev->irq < 0) {
  90                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
  91                                 __func__);
  92                 kfree(wax);
  93                 return -EBUSY;
  94         }
  95
  96         wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
  97
  98         ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
  99         if (ret < 0) {
 100                 kfree(wax);
 101                 return ret;
 102         }
 103
 104         /* enable IRQ's for devices below WAX */
 105         gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
 106
 107         /* Done init'ing, register this driver */
 108         ret = gsc_common_setup(dev, wax);
 109         if (ret) {
 110                 kfree(wax);
 111                 return ret;
 112         }
 113
 114         gsc_fixup_irqs(dev, wax, wax_choose_irq);
 115         /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
 116         parent = parisc_parent(dev);
 117         if (parent->id.hw_type != HPHW_IOA) {
 118                 gsc_fixup_irqs(parent, wax, wax_choose_irq);
 119         }
 120
 121         return ret;
 122 }
 123
 124 static const struct parisc_device_id wax_tbl[] __initconst = {
 125         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
 126         { 0, }
 127 };
 128
 129 MODULE_DEVICE_TABLE(parisc, wax_tbl);
 130
 131 struct parisc_driver wax_driver __refdata = {
 132         .name =         "wax",
 133         .id_table =     wax_tbl,
 134         .probe =        wax_init_chip,
 135 };