arch/ia64/sn/pci/pcibr/pcibr_provider.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2001-2004 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/pci.h>
  12 #include <asm/sn/sn_sal.h>
  13 #include "xtalk/xwidgetdev.h"
  14 #include <asm/sn/geo.h>
  15 #include "xtalk/hubdev.h"
  16 #include "pci/pcibus_provider_defs.h"
  17 #include "pci/pcidev.h"
  18 #include "pci/pcibr_provider.h"
  19 #include <asm/sn/addrs.h>
  20
  21
  22 static int sal_pcibr_error_interrupt(struct pcibus_info *soft)
  23 {
  24         struct ia64_sal_retval ret_stuff;
  25         uint64_t busnum;
  26         int segment;
  27         ret_stuff.status = 0;
  28         ret_stuff.v0 = 0;
  29
  30         segment = 0;
  31         busnum = soft->pbi_buscommon.bs_persist_busnum;
  32         SAL_CALL_NOLOCK(ret_stuff,
  33                         (u64) SN_SAL_IOIF_ERROR_INTERRUPT,
  34                         (u64) segment, (u64) busnum, 0, 0, 0, 0, 0);
  35
  36         return (int)ret_stuff.v0;
  37 }
  38
  39 /*
  40  * PCI Bridge Error interrupt handler.  Gets invoked whenever a PCI
  41  * bridge sends an error interrupt.
  42  */
  43 static irqreturn_t
  44 pcibr_error_intr_handler(int irq, void *arg, struct pt_regs *regs)
  45 {
  46         struct pcibus_info *soft = (struct pcibus_info *)arg;
  47
  48         if (sal_pcibr_error_interrupt(soft) < 0) {
  49                 panic("pcibr_error_intr_handler(): Fatal Bridge Error");
  50         }
  51         return IRQ_HANDLED;
  52 }
  53
  54 void *
  55 pcibr_bus_fixup(struct pcibus_bussoft *prom_bussoft)
  56 {
  57         int nasid, cnode, j;
  58         struct hubdev_info *hubdev_info;
  59         struct pcibus_info *soft;
  60         struct sn_flush_device_list *sn_flush_device_list;
  61
  62         if (! IS_PCI_BRIDGE_ASIC(prom_bussoft->bs_asic_type)) {
  63                 return NULL;
  64         }
  65
  66         /*
  67          * Allocate kernel bus soft and copy from prom.
  68          */
  69
  70         soft = kmalloc(sizeof(struct pcibus_info), GFP_KERNEL);
  71         if (!soft) {
  72                 return NULL;
  73         }
  74
  75         memcpy(soft, prom_bussoft, sizeof(struct pcibus_info));
  76         soft->pbi_buscommon.bs_base =
  77             (((u64) soft->pbi_buscommon.
  78               bs_base << 4) >> 4) | __IA64_UNCACHED_OFFSET;
  79
  80         spin_lock_init(&soft->pbi_lock);
  81
  82         /*
  83          * register the bridge's error interrupt handler
  84          */
  85         if (request_irq(SGI_PCIBR_ERROR, (void *)pcibr_error_intr_handler,
  86                         SA_SHIRQ, "PCIBR error", (void *)(soft))) {
  87                 printk(KERN_WARNING
  88                        "pcibr cannot allocate interrupt for error handler\n");
  89         }
  90
  91         /*
  92          * Update the Bridge with the "kernel" pagesize
  93          */
  94         if (PAGE_SIZE < 16384) {
  95                 pcireg_control_bit_clr(soft, PCIBR_CTRL_PAGE_SIZE);
  96         } else {
  97                 pcireg_control_bit_set(soft, PCIBR_CTRL_PAGE_SIZE);
  98         }
  99
 100         nasid = NASID_GET(soft->pbi_buscommon.bs_base);
 101         cnode = nasid_to_cnodeid(nasid);
 102         hubdev_info = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
 103
 104         if (hubdev_info->hdi_flush_nasid_list.widget_p) {
 105                 sn_flush_device_list = hubdev_info->hdi_flush_nasid_list.
 106                     widget_p[(int)soft->pbi_buscommon.bs_xid];
 107                 if (sn_flush_device_list) {
 108                         for (j = 0; j < DEV_PER_WIDGET;
 109                              j++, sn_flush_device_list++) {
 110                                 if (sn_flush_device_list->sfdl_slot == -1)
 111                                         continue;
 112                                 if (sn_flush_device_list->
 113                                     sfdl_persistent_busnum ==
 114                                     soft->pbi_buscommon.bs_persist_busnum)
 115                                         sn_flush_device_list->sfdl_pcibus_info =
 116                                             soft;
 117                         }
 118                 }
 119         }
 120
 121         /* Setup the PMU ATE map */
 122         soft->pbi_int_ate_resource.lowest_free_index = 0;
 123         soft->pbi_int_ate_resource.ate =
 124             kmalloc(soft->pbi_int_ate_size * sizeof(uint64_t), GFP_KERNEL);
 125         memset(soft->pbi_int_ate_resource.ate, 0,
 126                (soft->pbi_int_ate_size * sizeof(uint64_t)));
 127
 128         return soft;
 129 }
 130
 131 void pcibr_force_interrupt(struct sn_irq_info *sn_irq_info)
 132 {
 133         struct pcidev_info *pcidev_info;
 134         struct pcibus_info *pcibus_info;
 135         int bit = sn_irq_info->irq_int_bit;
 136
 137         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
 138         if (pcidev_info) {
 139                 pcibus_info =
 140                     (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
 141                     pdi_pcibus_info;
 142                 pcireg_force_intr_set(pcibus_info, bit);
 143         }
 144 }
 145
 146 void pcibr_change_devices_irq(struct sn_irq_info *sn_irq_info)
 147 {
 148         struct pcidev_info *pcidev_info;
 149         struct pcibus_info *pcibus_info;
 150         int bit = sn_irq_info->irq_int_bit;
 151         uint64_t xtalk_addr = sn_irq_info->irq_xtalkaddr;
 152
 153         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
 154         if (pcidev_info) {
 155                 pcibus_info =
 156                     (struct pcibus_info *)pcidev_info->pdi_host_pcidev_info->
 157                     pdi_pcibus_info;
 158
 159                 /* Disable the device's IRQ   */
 160                 pcireg_intr_enable_bit_clr(pcibus_info, bit);
 161
 162                 /* Change the device's IRQ    */
 163                 pcireg_intr_addr_addr_set(pcibus_info, bit, xtalk_addr);
 164
 165                 /* Re-enable the device's IRQ */
 166                 pcireg_intr_enable_bit_set(pcibus_info, bit);
 167
 168                 pcibr_force_interrupt(sn_irq_info);
 169         }
 170 }