[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>

2 files changed, 148 insertions, 25 deletions

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 05e4ea8..318087e 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);
 }
 
diff --git a/include/asm-ia64/sn/pcidev.h b/include/asm-ia64/sn/pcidev.h
index 49711d0..f65d222 100644
--- a/include/asm-ia64/sn/pcidev.h
+++ b/include/asm-ia64/sn/pcidev.h
@@ -3,15 +3,27 @@
  * 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.
  */
 #ifndef _ASM_IA64_SN_PCI_PCIDEV_H
 #define _ASM_IA64_SN_PCI_PCIDEV_H
 
 #include <linux/pci.h>
 
-#define SN_PCIDEV_INFO(pci_dev) \
-        ((struct pcidev_info *)(pci_dev)->sysdata)
+/*
+ * In ia64, pci_dev->sysdata must be a *pci_controller. To provide access to
+ * the pcidev_info structs for all devices under a controller, we extend the
+ * definition of pci_controller, via sn_pci_controller, to include a list
+ * of pcidev_info.
+ */
+struct sn_pci_controller {
+	struct pci_controller pci_controller;
+	struct list_head pcidev_info;
+};
+
+#define SN_PCI_CONTROLLER(dev) ((struct sn_pci_controller *) dev->sysdata)
+
+#define SN_PCIDEV_INFO(dev)	sn_pcidev_info_get(dev)
 
 #define SN_PCIBUS_BUSSOFT_INFO(pci_bus) \
 	(struct pcibus_info *)((struct pcibus_bussoft *)(PCI_CONTROLLER((pci_bus))->platform_data))
@@ -53,11 +65,13 @@ struct pcidev_info {
 	struct sn_irq_info	*pdi_sn_irq_info;
 	struct sn_pcibus_provider *pdi_provider;	/* sn pci ops */
 	struct pci_dev 		*host_pci_dev;		/* host bus link */
+	struct list_head	pdi_list;		/* List of pcidev_info */
 };
 
 extern void sn_irq_fixup(struct pci_dev *pci_dev,
 			 struct sn_irq_info *sn_irq_info);
 extern void sn_irq_unfixup(struct pci_dev *pci_dev);
+extern struct pcidev_info * sn_pcidev_info_get(struct pci_dev *);
 extern void sn_pci_controller_fixup(int segment, int busnum,
  				    struct pci_bus *bus);
 extern void sn_bus_store_sysdata(struct pci_dev *dev);