[IA64-SGI] altix: pci_window fixup

Altix only patch to add fixup code that sets up
pci_controller->window. This code is a temporary
fix until ACPI support on Altix is added.

Also, corrects the usage of pci_dev->sysdata,
which had previously been used to reference
platform specific device info, to now point to
a pci_controller struct.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 131 insertions, 22 deletions

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 05e4ea889981..318087e35b66 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -3,7 +3,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1992 - 1997, 2000-2004 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
  */
 
 #include <linux/bootmem.h>
@@ -147,6 +147,24 @@ sal_get_pcidev_info(u64 segment, u64 bus_number, u64 devfn, u64 pci_dev,
 }
 
 /*
+ * sn_pcidev_info_get() - Retrieve the pcidev_info struct for the specified
+ *                        device.
+ */
+inline struct pcidev_info *
+sn_pcidev_info_get(struct pci_dev *dev)
+{
+        struct pcidev_info *pcidev;
+
+        list_for_each_entry(pcidev,
+                            &(SN_PCI_CONTROLLER(dev)->pcidev_info), pdi_list) {
+                if (pcidev->pdi_linux_pcidev == dev) {
+                        return pcidev;
+                }
+        }
+        return NULL;
+}
+
+/*
  * sn_fixup_ionodes() - This routine initializes the HUB data strcuture for 
  *      each node in the system.
  */
@@ -229,6 +247,50 @@ static void sn_fixup_ionodes(void)
 
 }
 
+/*
+ * sn_pci_window_fixup() - Create a pci_window for each device resource.
+ *                         Until ACPI support is added, we need this code
+ *                         to setup pci_windows for use by
+ *                         pcibios_bus_to_resource(),
+ *                         pcibios_resource_to_bus(), etc.
+ */
+static void
+sn_pci_window_fixup(struct pci_dev *dev, unsigned int count,
+                    int64_t * pci_addrs)
+{
+        struct pci_controller *controller = PCI_CONTROLLER(dev->bus);
+        unsigned int i;
+        unsigned int idx;
+        unsigned int new_count;
+        struct pci_window *new_window;
+
+        if (count == 0)
+                return;
+        idx = controller->windows;
+        new_count = controller->windows + count;
+        new_window = kcalloc(new_count, sizeof(struct pci_window), GFP_KERNEL);
+        if (new_window == NULL)
+                BUG();
+        if (controller->window) {
+                memcpy(new_window, controller->window,
+                       sizeof(struct pci_window) * controller->windows);
+                kfree(controller->window);
+        }
+
+        /* Setup a pci_window for each device resource. */
+        for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+                if (pci_addrs[i] == -1)
+                        continue;
+
+                new_window[idx].offset = dev->resource[i].start - pci_addrs[i];
+                new_window[idx].resource = dev->resource[i];
+                idx++;
+        }
+
+        controller->windows = new_count;
+        controller->window = new_window;
+}
+
 void sn_pci_unfixup_slot(struct pci_dev *dev)
 {
         struct pci_dev *host_pci_dev = SN_PCIDEV_INFO(dev)->host_pci_dev;
@@ -246,21 +308,23 @@ void sn_pci_unfixup_slot(struct pci_dev *dev)
  */
 void sn_pci_fixup_slot(struct pci_dev *dev)
 {
+        unsigned int count = 0;
         int idx;
         int segment = pci_domain_nr(dev->bus);
         int status = 0;
         struct pcibus_bussoft *bs;
         struct pci_bus *host_pci_bus;
         struct pci_dev *host_pci_dev;
+        struct pcidev_info *pcidev_info;
+        int64_t pci_addrs[PCI_ROM_RESOURCE + 1];
         struct sn_irq_info *sn_irq_info;
         unsigned long size;
         unsigned int bus_no, devfn;
 
         pci_dev_get(dev); /* for the sysdata pointer */
-        dev->sysdata = kmalloc(sizeof(struct pcidev_info), GFP_KERNEL);
-        if (SN_PCIDEV_INFO(dev) <= 0)
+        pcidev_info = kzalloc(sizeof(struct pcidev_info), GFP_KERNEL);
+        if (pcidev_info <= 0)
                 BUG();          /* Cannot afford to run out of memory */
-        memset(SN_PCIDEV_INFO(dev), 0, sizeof(struct pcidev_info));
 
         sn_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
         if (sn_irq_info <= 0)
@@ -270,22 +334,34 @@ void sn_pci_fixup_slot(struct pci_dev *dev)
         /* Call to retrieve pci device information needed by kernel. */
         status = sal_get_pcidev_info((u64) segment, (u64) dev->bus->number, 
                                      dev->devfn,
-                                     (u64) __pa(SN_PCIDEV_INFO(dev)),
+                                     (u64) __pa(pcidev_info),
                                      (u64) __pa(sn_irq_info));
         if (status)
                 BUG(); /* Cannot get platform pci device information */
 
+        /* Add pcidev_info to list in sn_pci_controller struct */
+        list_add_tail(&pcidev_info->pdi_list,
+                      &(SN_PCI_CONTROLLER(dev->bus)->pcidev_info));
+
         /* Copy over PIO Mapped Addresses */
         for (idx = 0; idx <= PCI_ROM_RESOURCE; idx++) {
                 unsigned long start, end, addr;
 
-                if (!SN_PCIDEV_INFO(dev)->pdi_pio_mapped_addr[idx])
+                if (!pcidev_info->pdi_pio_mapped_addr[idx]) {
+                        pci_addrs[idx] = -1;
                         continue;
+                }
 
                 start = dev->resource[idx].start;
                 end = dev->resource[idx].end;
                 size = end - start;
-                addr = SN_PCIDEV_INFO(dev)->pdi_pio_mapped_addr[idx];
+                if (size == 0) {
+                        pci_addrs[idx] = -1;
+                        continue;
+                }
+                pci_addrs[idx] = start;
+                count++;
+                addr = pcidev_info->pdi_pio_mapped_addr[idx];
                 addr = ((addr << 4) >> 4) | __IA64_UNCACHED_OFFSET;
                 dev->resource[idx].start = addr;
                 dev->resource[idx].end = addr + size;
@@ -294,23 +370,27 @@ void sn_pci_fixup_slot(struct pci_dev *dev)
                 else
                         dev->resource[idx].parent = &iomem_resource;
         }
+        /* Create a pci_window in the pci_controller struct for
+         * each device resource.
+         */
+        if (count > 0)
+                sn_pci_window_fixup(dev, count, pci_addrs);
 
         /*
          * Using the PROMs values for the PCI host bus, get the Linux
          * PCI host_pci_dev struct and set up host bus linkages
          */
 
-        bus_no = (SN_PCIDEV_INFO(dev)->pdi_slot_host_handle >> 32) & 0xff;
-        devfn = SN_PCIDEV_INFO(dev)->pdi_slot_host_handle & 0xffffffff;
+        bus_no = (pcidev_info->pdi_slot_host_handle >> 32) & 0xff;
+        devfn = pcidev_info->pdi_slot_host_handle & 0xffffffff;
         host_pci_bus = pci_find_bus(segment, bus_no);
         host_pci_dev = pci_get_slot(host_pci_bus, devfn);
 
-        SN_PCIDEV_INFO(dev)->host_pci_dev = host_pci_dev;
-        SN_PCIDEV_INFO(dev)->pdi_host_pcidev_info =
-                                                SN_PCIDEV_INFO(host_pci_dev);
-        SN_PCIDEV_INFO(dev)->pdi_linux_pcidev = dev;
+        pcidev_info->host_pci_dev = host_pci_dev;
+        pcidev_info->pdi_linux_pcidev = dev;
+        pcidev_info->pdi_host_pcidev_info = SN_PCIDEV_INFO(host_pci_dev);
         bs = SN_PCIBUS_BUSSOFT(dev->bus);
-        SN_PCIDEV_INFO(dev)->pdi_pcibus_info = bs;
+        pcidev_info->pdi_pcibus_info = bs;
 
         if (bs && bs->bs_asic_type < PCIIO_ASIC_MAX_TYPES) {
                 SN_PCIDEV_BUSPROVIDER(dev) = sn_pci_provider[bs->bs_asic_type];
@@ -320,11 +400,11 @@ void sn_pci_fixup_slot(struct pci_dev *dev)
 
         /* Only set up IRQ stuff if this device has a host bus context */
         if (bs && sn_irq_info->irq_irq) {
-                SN_PCIDEV_INFO(dev)->pdi_sn_irq_info = sn_irq_info;
-                dev->irq = SN_PCIDEV_INFO(dev)->pdi_sn_irq_info->irq_irq;
+                pcidev_info->pdi_sn_irq_info = sn_irq_info;
+                dev->irq = pcidev_info->pdi_sn_irq_info->irq_irq;
                 sn_irq_fixup(dev, sn_irq_info);
         } else {
-                SN_PCIDEV_INFO(dev)->pdi_sn_irq_info = NULL;
+                pcidev_info->pdi_sn_irq_info = NULL;
                 kfree(sn_irq_info);
         }
 }
@@ -338,6 +418,7 @@ void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
         int status = 0;
         int nasid, cnode;
         struct pci_controller *controller;
+        struct sn_pci_controller *sn_controller;
         struct pcibus_bussoft *prom_bussoft_ptr;
         struct hubdev_info *hubdev_info;
         void *provider_soft = NULL;
@@ -349,10 +430,15 @@ void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
                 return;         /*bus # does not exist */
         prom_bussoft_ptr = __va(prom_bussoft_ptr);
 
-        controller = kzalloc(sizeof(struct pci_controller), GFP_KERNEL);
+        /* Allocate a sn_pci_controller, which has a pci_controller struct
+         * as the first member.
+         */
+        sn_controller = kzalloc(sizeof(struct sn_pci_controller), GFP_KERNEL);
+        if (!sn_controller)
+                BUG();
+        INIT_LIST_HEAD(&sn_controller->pcidev_info);
+        controller = &sn_controller->pci_controller;
         controller->segment = segment;
-        if (!controller)
-                BUG();
 
         if (bus == NULL) {
                 bus = pci_scan_bus(busnum, &pci_root_ops, controller);
@@ -390,6 +476,29 @@ void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
         }
 
         /*
+         * Setup pci_windows for legacy IO and MEM space.
+         * (Temporary until ACPI support is in place.)
+         */
+        controller->window = kcalloc(2, sizeof(struct pci_window), GFP_KERNEL);
+        if (controller->window == NULL)
+                BUG();
+        controller->window[0].offset = prom_bussoft_ptr->bs_legacy_io;
+        controller->window[0].resource.name = "legacy_io";
+        controller->window[0].resource.flags = IORESOURCE_IO;
+        controller->window[0].resource.start = prom_bussoft_ptr->bs_legacy_io;
+        controller->window[0].resource.end =
+            controller->window[0].resource.start + 0xffff;
+        controller->window[0].resource.parent = &ioport_resource;
+        controller->window[1].offset = prom_bussoft_ptr->bs_legacy_mem;
+        controller->window[1].resource.name = "legacy_mem";
+        controller->window[1].resource.flags = IORESOURCE_MEM;
+        controller->window[1].resource.start = prom_bussoft_ptr->bs_legacy_mem;
+        controller->window[1].resource.end =
+            controller->window[1].resource.start + (1024 * 1024) - 1;
+        controller->window[1].resource.parent = &iomem_resource;
+        controller->windows = 2;
+
+        /*
          * Generic bus fixup goes here.  Don't reference prom_bussoft_ptr
          * after this point.
          */
@@ -421,7 +530,7 @@ void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
 
 error_return:
 
-        kfree(controller);
+        kfree(sn_controller);
         return;
 }
 
@@ -434,7 +543,7 @@ void sn_bus_store_sysdata(struct pci_dev *dev)
                 dev_dbg(dev, "%s: out of memory!\n", __FUNCTION__);
                 return;
         }
-        element->sysdata = dev->sysdata;
+        element->sysdata = SN_PCIDEV_INFO(dev);
         list_add(&element->entry, &sn_sysdata_list);
 }