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Linux/drivers/parisc/wax.c

  1 /*
  2  *      WAX Device Driver
  3  *
  4  *      (c) Copyright 2000 The Puffin Group Inc.
  5  *
  6  *      This program is free software; you can redistribute it and/or modify
  7  *      it under the terms of the GNU General Public License as published by
  8  *      the Free Software Foundation; either version 2 of the License, or
  9  *      (at your option) any later version.
 10  *
 11  *      by Helge Deller <deller@gmx.de>
 12  */
 13 
 14 #include <linux/errno.h>
 15 #include <linux/init.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/ioport.h>
 18 #include <linux/slab.h>
 19 #include <linux/module.h>
 20 #include <linux/types.h>
 21 
 22 #include <asm/io.h>
 23 #include <asm/hardware.h>
 24 
 25 #include "gsc.h"
 26 
 27 #define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */
 28 
 29 static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
 30 {
 31         int irq;
 32 
 33         switch (dev->id.sversion) {
 34                 case 0x73:      irq =  1; break; /* i8042 General */
 35                 case 0x8c:      irq =  6; break; /* Serial */
 36                 case 0x90:      irq = 10; break; /* EISA */
 37                 default:        return;          /* Unknown */
 38         }
 39 
 40         gsc_asic_assign_irq(ctrl, irq, &dev->irq);
 41 
 42         switch (dev->id.sversion) {
 43                 case 0x73:      irq =  2; break; /* i8042 High-priority */
 44                 case 0x90:      irq =  0; break; /* EISA NMI */
 45                 default:        return;          /* No secondary IRQ */
 46         }
 47 
 48         gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
 49 }
 50 
 51 static void __init
 52 wax_init_irq(struct gsc_asic *wax)
 53 {
 54         unsigned long base = wax->hpa;
 55 
 56         /* Wax-off */
 57         gsc_writel(0x00000000, base+OFFSET_IMR);
 58 
 59         /* clear pending interrupts */
 60         gsc_readl(base+OFFSET_IRR);
 61 
 62         /* We're not really convinced we want to reset the onboard
 63          * devices. Firmware does it for us...
 64          */
 65 
 66         /* Resets */
 67 //      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
 68 //      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
 69 }
 70 
 71 static int __init wax_init_chip(struct parisc_device *dev)
 72 {
 73         struct gsc_asic *wax;
 74         struct parisc_device *parent;
 75         struct gsc_irq gsc_irq;
 76         int ret;
 77 
 78         wax = kzalloc(sizeof(*wax), GFP_KERNEL);
 79         if (!wax)
 80                 return -ENOMEM;
 81 
 82         wax->name = "wax";
 83         wax->hpa = dev->hpa.start;
 84 
 85         wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
 86         printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);
 87 
 88         /* Stop wax hissing for a bit */
 89         wax_init_irq(wax);
 90 
 91         /* the IRQ wax should use */
 92         dev->irq = gsc_claim_irq(&gsc_irq, WAX_GSC_IRQ);
 93         if (dev->irq < 0) {
 94                 printk(KERN_ERR "%s(): cannot get GSC irq\n",
 95                                 __func__);
 96                 kfree(wax);
 97                 return -EBUSY;
 98         }
 99 
100         wax->eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;
101 
102         ret = request_irq(gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
103         if (ret < 0) {
104                 kfree(wax);
105                 return ret;
106         }
107 
108         /* enable IRQ's for devices below WAX */
109         gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);
110 
111         /* Done init'ing, register this driver */
112         ret = gsc_common_setup(dev, wax);
113         if (ret) {
114                 kfree(wax);
115                 return ret;
116         }
117 
118         gsc_fixup_irqs(dev, wax, wax_choose_irq);
119         /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
120         parent = parisc_parent(dev);
121         if (parent->id.hw_type != HPHW_IOA) {
122                 gsc_fixup_irqs(parent, wax, wax_choose_irq);
123         }
124 
125         return ret;
126 }
127 
128 static struct parisc_device_id wax_tbl[] = {
129         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
130         { 0, }
131 };
132 
133 MODULE_DEVICE_TABLE(parisc, wax_tbl);
134 
135 struct parisc_driver wax_driver = {
136         .name =         "wax",
137         .id_table =     wax_tbl,
138         .probe =        wax_init_chip,
139 };
140 

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