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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * WAX Device Driver4 *5 * (c) Copyright 2000 The Puffin Group Inc.6 *7 * (c) 2000-2023 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 25static 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 47static void __init48wax_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 onboard59 * 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 67static int __init wax_init_chip(struct parisc_device *dev)68{69 struct gsc_asic *wax;70 struct parisc_device *parent;71 int ret;72 73 wax = kzalloc(sizeof(*wax), GFP_KERNEL);74 if (!wax)75 return -ENOMEM;76 77 wax->name = "wax";78 wax->hpa = dev->hpa.start;79 80 wax->version = 0; /* gsc_readb(wax->hpa+WAX_VER); */81 printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);82 83 /* Stop wax hissing for a bit */84 wax_init_irq(wax);85 86 /* the IRQ wax should use */87 dev->irq = gsc_claim_irq(&wax->gsc_irq, WAX_GSC_IRQ);88 if (dev->irq < 0) {89 printk(KERN_ERR "%s(): cannot get GSC irq\n",90 __func__);91 kfree(wax);92 return -EBUSY;93 }94 95 wax->eim = ((u32) wax->gsc_irq.txn_addr) | wax->gsc_irq.txn_data;96 97 ret = request_irq(wax->gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);98 if (ret < 0) {99 kfree(wax);100 return ret;101 }102 103 /* enable IRQ's for devices below WAX */104 gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);105 106 /* Done init'ing, register this driver */107 ret = gsc_common_setup(dev, wax);108 if (ret) {109 kfree(wax);110 return ret;111 }112 113 gsc_fixup_irqs(dev, wax, wax_choose_irq);114 /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */115 parent = parisc_parent(dev);116 if (parent->id.hw_type != HPHW_IOA) {117 gsc_fixup_irqs(parent, wax, wax_choose_irq);118 }119 120 return ret;121}122 123static const struct parisc_device_id wax_tbl[] __initconst = {124 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },125 { 0, }126};127 128MODULE_DEVICE_TABLE(parisc, wax_tbl);129 130static struct parisc_driver wax_driver __refdata = {131 .name = "wax",132 .id_table = wax_tbl,133 .probe = wax_init_chip,134};135 136static int __init wax_init(void)137{138 return register_parisc_driver(&wax_driver);139}140arch_initcall(wax_init);141