x86_64: move kernel

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1578 insertions, 0 deletions

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
new file mode 100644
index 00000000000..71da01e73f0
--- /dev/null
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -0,0 +1,1578 @@
+/*
+ * Derived from arch/powerpc/kernel/iommu.c
+ *
+ * Copyright IBM Corporation, 2006-2007
+ * Copyright (C) 2006  Jon Mason <jdmason@kudzu.us>
+ *
+ * Author: Jon Mason <jdmason@kudzu.us>
+ * Author: Muli Ben-Yehuda <muli@il.ibm.com>
+
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/pci_ids.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <asm/iommu.h>
+#include <asm/calgary.h>
+#include <asm/tce.h>
+#include <asm/pci-direct.h>
+#include <asm/system.h>
+#include <asm/dma.h>
+#include <asm/rio.h>
+
+#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
+int use_calgary __read_mostly = 1;
+#else
+int use_calgary __read_mostly = 0;
+#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
+
+#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
+#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
+
+/* register offsets inside the host bridge space */
+#define CALGARY_CONFIG_REG	0x0108
+#define PHB_CSR_OFFSET		0x0110 /* Channel Status */
+#define PHB_PLSSR_OFFSET	0x0120
+#define PHB_CONFIG_RW_OFFSET	0x0160
+#define PHB_IOBASE_BAR_LOW	0x0170
+#define PHB_IOBASE_BAR_HIGH	0x0180
+#define PHB_MEM_1_LOW		0x0190
+#define PHB_MEM_1_HIGH		0x01A0
+#define PHB_IO_ADDR_SIZE	0x01B0
+#define PHB_MEM_1_SIZE		0x01C0
+#define PHB_MEM_ST_OFFSET	0x01D0
+#define PHB_AER_OFFSET		0x0200
+#define PHB_CONFIG_0_HIGH	0x0220
+#define PHB_CONFIG_0_LOW	0x0230
+#define PHB_CONFIG_0_END	0x0240
+#define PHB_MEM_2_LOW		0x02B0
+#define PHB_MEM_2_HIGH		0x02C0
+#define PHB_MEM_2_SIZE_HIGH	0x02D0
+#define PHB_MEM_2_SIZE_LOW	0x02E0
+#define PHB_DOSHOLE_OFFSET	0x08E0
+
+/* CalIOC2 specific */
+#define PHB_SAVIOR_L2		0x0DB0
+#define PHB_PAGE_MIG_CTRL	0x0DA8
+#define PHB_PAGE_MIG_DEBUG	0x0DA0
+#define PHB_ROOT_COMPLEX_STATUS 0x0CB0
+
+/* PHB_CONFIG_RW */
+#define PHB_TCE_ENABLE		0x20000000
+#define PHB_SLOT_DISABLE	0x1C000000
+#define PHB_DAC_DISABLE		0x01000000
+#define PHB_MEM2_ENABLE		0x00400000
+#define PHB_MCSR_ENABLE		0x00100000
+/* TAR (Table Address Register) */
+#define TAR_SW_BITS		0x0000ffffffff800fUL
+#define TAR_VALID		0x0000000000000008UL
+/* CSR (Channel/DMA Status Register) */
+#define CSR_AGENT_MASK		0xffe0ffff
+/* CCR (Calgary Configuration Register) */
+#define CCR_2SEC_TIMEOUT	0x000000000000000EUL
+/* PMCR/PMDR (Page Migration Control/Debug Registers */
+#define PMR_SOFTSTOP		0x80000000
+#define PMR_SOFTSTOPFAULT	0x40000000
+#define PMR_HARDSTOP		0x20000000
+
+#define MAX_NUM_OF_PHBS		8 /* how many PHBs in total? */
+#define MAX_NUM_CHASSIS		8 /* max number of chassis */
+/* MAX_PHB_BUS_NUM is the maximal possible dev->bus->number */
+#define MAX_PHB_BUS_NUM		(MAX_NUM_OF_PHBS * MAX_NUM_CHASSIS * 2)
+#define PHBS_PER_CALGARY	4
+
+/* register offsets in Calgary's internal register space */
+static const unsigned long tar_offsets[] = {
+	0x0580 /* TAR0 */,
+	0x0588 /* TAR1 */,
+	0x0590 /* TAR2 */,
+	0x0598 /* TAR3 */
+};
+
+static const unsigned long split_queue_offsets[] = {
+	0x4870 /* SPLIT QUEUE 0 */,
+	0x5870 /* SPLIT QUEUE 1 */,
+	0x6870 /* SPLIT QUEUE 2 */,
+	0x7870 /* SPLIT QUEUE 3 */
+};
+
+static const unsigned long phb_offsets[] = {
+	0x8000 /* PHB0 */,
+	0x9000 /* PHB1 */,
+	0xA000 /* PHB2 */,
+	0xB000 /* PHB3 */
+};
+
+/* PHB debug registers */
+
+static const unsigned long phb_debug_offsets[] = {
+	0x4000	/* PHB 0 DEBUG */,
+	0x5000	/* PHB 1 DEBUG */,
+	0x6000	/* PHB 2 DEBUG */,
+	0x7000	/* PHB 3 DEBUG */
+};
+
+/*
+ * STUFF register for each debug PHB,
+ * byte 1 = start bus number, byte 2 = end bus number
+ */
+
+#define PHB_DEBUG_STUFF_OFFSET	0x0020
+
+#define EMERGENCY_PAGES 32 /* = 128KB */
+
+unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
+static int translate_empty_slots __read_mostly = 0;
+static int calgary_detected __read_mostly = 0;
+
+static struct rio_table_hdr	*rio_table_hdr __initdata;
+static struct scal_detail	*scal_devs[MAX_NUMNODES] __initdata;
+static struct rio_detail	*rio_devs[MAX_NUMNODES * 4] __initdata;
+
+struct calgary_bus_info {
+	void *tce_space;
+	unsigned char translation_disabled;
+	signed char phbid;
+	void __iomem *bbar;
+};
+
+static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
+static void calgary_tce_cache_blast(struct iommu_table *tbl);
+static void calgary_dump_error_regs(struct iommu_table *tbl);
+static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
+static void calioc2_tce_cache_blast(struct iommu_table *tbl);
+static void calioc2_dump_error_regs(struct iommu_table *tbl);
+
+static struct cal_chipset_ops calgary_chip_ops = {
+	.handle_quirks = calgary_handle_quirks,
+	.tce_cache_blast = calgary_tce_cache_blast,
+	.dump_error_regs = calgary_dump_error_regs
+};
+
+static struct cal_chipset_ops calioc2_chip_ops = {
+	.handle_quirks = calioc2_handle_quirks,
+	.tce_cache_blast = calioc2_tce_cache_blast,
+	.dump_error_regs = calioc2_dump_error_regs
+};
+
+static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
+
+/* enable this to stress test the chip's TCE cache */
+#ifdef CONFIG_IOMMU_DEBUG
+int debugging __read_mostly = 1;
+
+static inline unsigned long verify_bit_range(unsigned long* bitmap,
+	int expected, unsigned long start, unsigned long end)
+{
+	unsigned long idx = start;
+
+	BUG_ON(start >= end);
+
+	while (idx < end) {
+		if (!!test_bit(idx, bitmap) != expected)
+			return idx;
+		++idx;
+	}
+
+	/* all bits have the expected value */
+	return ~0UL;
+}
+#else /* debugging is disabled */
+int debugging __read_mostly = 0;
+
+static inline unsigned long verify_bit_range(unsigned long* bitmap,
+	int expected, unsigned long start, unsigned long end)
+{
+	return ~0UL;
+}
+
+#endif /* CONFIG_IOMMU_DEBUG */
+
+static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen)
+{
+	unsigned int npages;
+
+	npages = PAGE_ALIGN(dma + dmalen) - (dma & PAGE_MASK);
+	npages >>= PAGE_SHIFT;
+
+	return npages;
+}
+
+static inline int translate_phb(struct pci_dev* dev)
+{
+	int disabled = bus_info[dev->bus->number].translation_disabled;
+	return !disabled;
+}
+
+static void iommu_range_reserve(struct iommu_table *tbl,
+	unsigned long start_addr, unsigned int npages)
+{
+	unsigned long index;
+	unsigned long end;
+	unsigned long badbit;
+	unsigned long flags;
+
+	index = start_addr >> PAGE_SHIFT;
+
+	/* bail out if we're asked to reserve a region we don't cover */
+	if (index >= tbl->it_size)
+		return;
+
+	end = index + npages;
+	if (end > tbl->it_size) /* don't go off the table */
+		end = tbl->it_size;
+
+	spin_lock_irqsave(&tbl->it_lock, flags);
+
+	badbit = verify_bit_range(tbl->it_map, 0, index, end);
+	if (badbit != ~0UL) {
+		if (printk_ratelimit())
+			printk(KERN_ERR "Calgary: entry already allocated at "
+			       "0x%lx tbl %p dma 0x%lx npages %u\n",
+			       badbit, tbl, start_addr, npages);
+	}
+
+	set_bit_string(tbl->it_map, index, npages);
+
+	spin_unlock_irqrestore(&tbl->it_lock, flags);
+}
+
+static unsigned long iommu_range_alloc(struct iommu_table *tbl,
+	unsigned int npages)
+{
+	unsigned long flags;
+	unsigned long offset;
+
+	BUG_ON(npages == 0);
+
+	spin_lock_irqsave(&tbl->it_lock, flags);
+
+	offset = find_next_zero_string(tbl->it_map, tbl->it_hint,
+				       tbl->it_size, npages);
+	if (offset == ~0UL) {
+		tbl->chip_ops->tce_cache_blast(tbl);
+		offset = find_next_zero_string(tbl->it_map, 0,
+					       tbl->it_size, npages);
+		if (offset == ~0UL) {
+			printk(KERN_WARNING "Calgary: IOMMU full.\n");
+			spin_unlock_irqrestore(&tbl->it_lock, flags);
+			if (panic_on_overflow)
+				panic("Calgary: fix the allocator.\n");
+			else
+				return bad_dma_address;
+		}
+	}
+
+	set_bit_string(tbl->it_map, offset, npages);
+	tbl->it_hint = offset + npages;
+	BUG_ON(tbl->it_hint > tbl->it_size);
+
+	spin_unlock_irqrestore(&tbl->it_lock, flags);
+
+	return offset;
+}
+
+static dma_addr_t iommu_alloc(struct iommu_table *tbl, void *vaddr,
+	unsigned int npages, int direction)
+{
+	unsigned long entry;
+	dma_addr_t ret = bad_dma_address;
+
+	entry = iommu_range_alloc(tbl, npages);
+
+	if (unlikely(entry == bad_dma_address))
+		goto error;
+
+	/* set the return dma address */
+	ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
+
+	/* put the TCEs in the HW table */
+	tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
+		  direction);
+
+	return ret;
+
+error:
+	printk(KERN_WARNING "Calgary: failed to allocate %u pages in "
+	       "iommu %p\n", npages, tbl);
+	return bad_dma_address;
+}
+
+static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
+	unsigned int npages)
+{
+	unsigned long entry;
+	unsigned long badbit;
+	unsigned long badend;
+	unsigned long flags;
+
+	/* were we called with bad_dma_address? */
+	badend = bad_dma_address + (EMERGENCY_PAGES * PAGE_SIZE);
+	if (unlikely((dma_addr >= bad_dma_address) && (dma_addr < badend))) {
+		printk(KERN_ERR "Calgary: driver tried unmapping bad DMA "
+		       "address 0x%Lx\n", dma_addr);
+		WARN_ON(1);
+		return;
+	}
+
+	entry = dma_addr >> PAGE_SHIFT;
+
+	BUG_ON(entry + npages > tbl->it_size);
+
+	tce_free(tbl, entry, npages);
+
+	spin_lock_irqsave(&tbl->it_lock, flags);
+
+	badbit = verify_bit_range(tbl->it_map, 1, entry, entry + npages);
+	if (badbit != ~0UL) {
+		if (printk_ratelimit())
+			printk(KERN_ERR "Calgary: bit is off at 0x%lx "
+			       "tbl %p dma 0x%Lx entry 0x%lx npages %u\n",
+			       badbit, tbl, dma_addr, entry, npages);
+	}
+
+	__clear_bit_string(tbl->it_map, entry, npages);
+
+	spin_unlock_irqrestore(&tbl->it_lock, flags);
+}
+
+static inline struct iommu_table *find_iommu_table(struct device *dev)
+{
+	struct pci_dev *pdev;
+	struct pci_bus *pbus;
+	struct iommu_table *tbl;
+
+	pdev = to_pci_dev(dev);
+
+	pbus = pdev->bus;
+
+	/* is the device behind a bridge? Look for the root bus */
+	while (pbus->parent)
+		pbus = pbus->parent;
+
+	tbl = pci_iommu(pbus);
+
+	BUG_ON(tbl && (tbl->it_busno != pbus->number));
+
+	return tbl;
+}
+
+static void calgary_unmap_sg(struct device *dev,
+	struct scatterlist *sglist, int nelems, int direction)
+{
+	struct iommu_table *tbl = find_iommu_table(dev);
+
+	if (!translate_phb(to_pci_dev(dev)))
+		return;
+
+	while (nelems--) {
+		unsigned int npages;
+		dma_addr_t dma = sglist->dma_address;
+		unsigned int dmalen = sglist->dma_length;
+
+		if (dmalen == 0)
+			break;
+
+		npages = num_dma_pages(dma, dmalen);
+		iommu_free(tbl, dma, npages);
+		sglist++;
+	}
+}
+
+static int calgary_nontranslate_map_sg(struct device* dev,
+	struct scatterlist *sg, int nelems, int direction)
+{
+	int i;
+
+	for (i = 0; i < nelems; i++ ) {
+		struct scatterlist *s = &sg[i];
+		BUG_ON(!s->page);
+		s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
+		s->dma_length = s->length;
+	}
+	return nelems;
+}
+
+static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
+	int nelems, int direction)
+{
+	struct iommu_table *tbl = find_iommu_table(dev);
+	unsigned long vaddr;
+	unsigned int npages;
+	unsigned long entry;
+	int i;
+
+	if (!translate_phb(to_pci_dev(dev)))
+		return calgary_nontranslate_map_sg(dev, sg, nelems, direction);
+
+	for (i = 0; i < nelems; i++ ) {
+		struct scatterlist *s = &sg[i];
+		BUG_ON(!s->page);
+
+		vaddr = (unsigned long)page_address(s->page) + s->offset;
+		npages = num_dma_pages(vaddr, s->length);
+
+		entry = iommu_range_alloc(tbl, npages);
+		if (entry == bad_dma_address) {
+			/* makes sure unmap knows to stop */
+			s->dma_length = 0;
+			goto error;
+		}
+
+		s->dma_address = (entry << PAGE_SHIFT) | s->offset;
+
+		/* insert into HW table */
+		tce_build(tbl, entry, npages, vaddr & PAGE_MASK,
+			  direction);
+
+		s->dma_length = s->length;
+	}
+
+	return nelems;
+error:
+	calgary_unmap_sg(dev, sg, nelems, direction);
+	for (i = 0; i < nelems; i++) {
+		sg[i].dma_address = bad_dma_address;
+		sg[i].dma_length = 0;
+	}
+	return 0;
+}
+
+static dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
+	size_t size, int direction)
+{
+	dma_addr_t dma_handle = bad_dma_address;
+	unsigned long uaddr;
+	unsigned int npages;
+	struct iommu_table *tbl = find_iommu_table(dev);
+
+	uaddr = (unsigned long)vaddr;
+	npages = num_dma_pages(uaddr, size);
+
+	if (translate_phb(to_pci_dev(dev)))
+		dma_handle = iommu_alloc(tbl, vaddr, npages, direction);
+	else
+		dma_handle = virt_to_bus(vaddr);
+
+	return dma_handle;
+}
+
+static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
+	size_t size, int direction)
+{
+	struct iommu_table *tbl = find_iommu_table(dev);
+	unsigned int npages;
+
+	if (!translate_phb(to_pci_dev(dev)))
+		return;
+
+	npages = num_dma_pages(dma_handle, size);
+	iommu_free(tbl, dma_handle, npages);
+}
+
+static void* calgary_alloc_coherent(struct device *dev, size_t size,
+	dma_addr_t *dma_handle, gfp_t flag)
+{
+	void *ret = NULL;
+	dma_addr_t mapping;
+	unsigned int npages, order;
+	struct iommu_table *tbl = find_iommu_table(dev);
+
+	size = PAGE_ALIGN(size); /* size rounded up to full pages */
+	npages = size >> PAGE_SHIFT;
+	order = get_order(size);
+
+	/* alloc enough pages (and possibly more) */
+	ret = (void *)__get_free_pages(flag, order);
+	if (!ret)
+		goto error;
+	memset(ret, 0, size);
+
+	if (translate_phb(to_pci_dev(dev))) {
+		/* set up tces to cover the allocated range */
+		mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL);
+		if (mapping == bad_dma_address)
+			goto free;
+
+		*dma_handle = mapping;
+	} else /* non translated slot */
+		*dma_handle = virt_to_bus(ret);
+
+	return ret;
+
+free:
+	free_pages((unsigned long)ret, get_order(size));
+	ret = NULL;
+error:
+	return ret;
+}
+
+static const struct dma_mapping_ops calgary_dma_ops = {
+	.alloc_coherent = calgary_alloc_coherent,
+	.map_single = calgary_map_single,
+	.unmap_single = calgary_unmap_single,
+	.map_sg = calgary_map_sg,
+	.unmap_sg = calgary_unmap_sg,
+};
+
+static inline void __iomem * busno_to_bbar(unsigned char num)
+{
+	return bus_info[num].bbar;
+}
+
+static inline int busno_to_phbid(unsigned char num)
+{
+	return bus_info[num].phbid;
+}
+
+static inline unsigned long split_queue_offset(unsigned char num)
+{
+	size_t idx = busno_to_phbid(num);
+
+	return split_queue_offsets[idx];
+}
+
+static inline unsigned long tar_offset(unsigned char num)
+{
+	size_t idx = busno_to_phbid(num);
+
+	return tar_offsets[idx];
+}
+
+static inline unsigned long phb_offset(unsigned char num)
+{
+	size_t idx = busno_to_phbid(num);
+
+	return phb_offsets[idx];
+}
+
+static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
+{
+	unsigned long target = ((unsigned long)bar) | offset;
+	return (void __iomem*)target;
+}
+
+static inline int is_calioc2(unsigned short device)
+{
+	return (device == PCI_DEVICE_ID_IBM_CALIOC2);
+}
+
+static inline int is_calgary(unsigned short device)
+{
+	return (device == PCI_DEVICE_ID_IBM_CALGARY);
+}
+
+static inline int is_cal_pci_dev(unsigned short device)
+{
+	return (is_calgary(device) || is_calioc2(device));
+}
+
+static void calgary_tce_cache_blast(struct iommu_table *tbl)
+{
+	u64 val;
+	u32 aer;
+	int i = 0;
+	void __iomem *bbar = tbl->bbar;
+	void __iomem *target;
+
+	/* disable arbitration on the bus */
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
+	aer = readl(target);
+	writel(0, target);
+
+	/* read plssr to ensure it got there */
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
+	val = readl(target);
+
+	/* poll split queues until all DMA activity is done */
+	target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
+	do {
+		val = readq(target);
+		i++;
+	} while ((val & 0xff) != 0xff && i < 100);
+	if (i == 100)
+		printk(KERN_WARNING "Calgary: PCI bus not quiesced, "
+		       "continuing anyway\n");
+
+	/* invalidate TCE cache */
+	target = calgary_reg(bbar, tar_offset(tbl->it_busno));
+	writeq(tbl->tar_val, target);
+
+	/* enable arbitration */
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
+	writel(aer, target);
+	(void)readl(target); /* flush */
+}
+
+static void calioc2_tce_cache_blast(struct iommu_table *tbl)
+{
+	void __iomem *bbar = tbl->bbar;
+	void __iomem *target;
+	u64 val64;
+	u32 val;
+	int i = 0;
+	int count = 1;
+	unsigned char bus = tbl->it_busno;
+
+begin:
+	printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
+	       "sequence - count %d\n", bus, count);
+
+	/* 1. using the Page Migration Control reg set SoftStop */
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
+	val |= PMR_SOFTSTOP;
+	printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
+	writel(cpu_to_be32(val), target);
+
+	/* 2. poll split queues until all DMA activity is done */
+	printk(KERN_DEBUG "2a. starting to poll split queues\n");
+	target = calgary_reg(bbar, split_queue_offset(bus));
+	do {
+		val64 = readq(target);
+		i++;
+	} while ((val64 & 0xff) != 0xff && i < 100);
+	if (i == 100)
+		printk(KERN_WARNING "CalIOC2: PCI bus not quiesced, "
+		       "continuing anyway\n");
+
+	/* 3. poll Page Migration DEBUG for SoftStopFault */
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
+
+	/* 4. if SoftStopFault - goto (1) */
+	if (val & PMR_SOFTSTOPFAULT) {
+		if (++count < 100)
+			goto begin;
+		else {
+			printk(KERN_WARNING "CalIOC2: too many SoftStopFaults, "
+			       "aborting TCE cache flush sequence!\n");
+			return; /* pray for the best */
+		}
+	}
+
+	/* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
+	printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
+
+	/* 6. invalidate TCE cache */
+	printk(KERN_DEBUG "6. invalidating TCE cache\n");
+	target = calgary_reg(bbar, tar_offset(bus));
+	writeq(tbl->tar_val, target);
+
+	/* 7. Re-read PMCR */
+	printk(KERN_DEBUG "7a. Re-reading PMCR\n");
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
+
+	/* 8. Remove HardStop */
+	printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
+	target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
+	val = 0;
+	printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
+	writel(cpu_to_be32(val), target);
+	val = be32_to_cpu(readl(target));
+	printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
+}
+
+static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
+	u64 limit)
+{
+	unsigned int numpages;
+
+	limit = limit | 0xfffff;
+	limit++;
+
+	numpages = ((limit - start) >> PAGE_SHIFT);
+	iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
+}
+
+static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
+{
+	void __iomem *target;
+	u64 low, high, sizelow;
+	u64 start, limit;
+	struct iommu_table *tbl = pci_iommu(dev->bus);
+	unsigned char busnum = dev->bus->number;
+	void __iomem *bbar = tbl->bbar;
+
+	/* peripheral MEM_1 region */
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
+	low = be32_to_cpu(readl(target));
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
+	high = be32_to_cpu(readl(target));
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
+	sizelow = be32_to_cpu(readl(target));
+
+	start = (high << 32) | low;
+	limit = sizelow;
+
+	calgary_reserve_mem_region(dev, start, limit);
+}
+
+static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
+{
+	void __iomem *target;
+	u32 val32;
+	u64 low, high, sizelow, sizehigh;
+	u64 start, limit;
+	struct iommu_table *tbl = pci_iommu(dev->bus);
+	unsigned char busnum = dev->bus->number;
+	void __iomem *bbar = tbl->bbar;
+
+	/* is it enabled? */
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
+	val32 = be32_to_cpu(readl(target));
+	if (!(val32 & PHB_MEM2_ENABLE))
+		return;
+
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
+	low = be32_to_cpu(readl(target));
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
+	high = be32_to_cpu(readl(target));
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
+	sizelow = be32_to_cpu(readl(target));
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
+	sizehigh = be32_to_cpu(readl(target));
+
+	start = (high << 32) | low;
+	limit = (sizehigh << 32) | sizelow;
+
+	calgary_reserve_mem_region(dev, start, limit);
+}
+
+/*
+ * some regions of the IO address space do not get translated, so we
+ * must not give devices IO addresses in those regions. The regions
+ * are the 640KB-1MB region and the two PCI peripheral memory holes.
+ * Reserve all of them in the IOMMU bitmap to avoid giving them out
+ * later.
+ */
+static void __init calgary_reserve_regions(struct pci_dev *dev)
+{
+	unsigned int npages;
+	u64 start;
+	struct iommu_table *tbl = pci_iommu(dev->bus);
+
+	/* reserve EMERGENCY_PAGES from bad_dma_address and up */
+	iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
+
+	/* avoid the BIOS/VGA first 640KB-1MB region */
+	/* for CalIOC2 - avoid the entire first MB */
+	if (is_calgary(dev->device)) {
+		start = (640 * 1024);
+		npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
+	} else { /* calioc2 */
+		start = 0;
+		npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
+	}
+	iommu_range_reserve(tbl, start, npages);
+
+	/* reserve the two PCI peripheral memory regions in IO space */
+	calgary_reserve_peripheral_mem_1(dev);
+	calgary_reserve_peripheral_mem_2(dev);
+}
+
+static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
+{
+	u64 val64;
+	u64 table_phys;
+	void __iomem *target;
+	int ret;
+	struct iommu_table *tbl;
+
+	/* build TCE tables for each PHB */
+	ret = build_tce_table(dev, bbar);
+	if (ret)
+		return ret;
+
+	tbl = pci_iommu(dev->bus);
+	tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
+	tce_free(tbl, 0, tbl->it_size);
+
+	if (is_calgary(dev->device))
+		tbl->chip_ops = &calgary_chip_ops;
+	else if (is_calioc2(dev->device))
+		tbl->chip_ops = &calioc2_chip_ops;
+	else
+		BUG();
+
+	calgary_reserve_regions(dev);
+
+	/* set TARs for each PHB */
+	target = calgary_reg(bbar, tar_offset(dev->bus->number));
+	val64 = be64_to_cpu(readq(target));
+
+	/* zero out all TAR bits under sw control */
+	val64 &= ~TAR_SW_BITS;
+	table_phys = (u64)__pa(tbl->it_base);
+
+	val64 |= table_phys;
+
+	BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
+	val64 |= (u64) specified_table_size;
+
+	tbl->tar_val = cpu_to_be64(val64);
+
+	writeq(tbl->tar_val, target);
+	readq(target); /* flush */
+
+	return 0;
+}
+
+static void __init calgary_free_bus(struct pci_dev *dev)
+{
+	u64 val64;
+	struct iommu_table *tbl = pci_iommu(dev->bus);
+	void __iomem *target;
+	unsigned int bitmapsz;
+
+	target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
+	val64 = be64_to_cpu(readq(target));
+	val64 &= ~TAR_SW_BITS;
+	writeq(cpu_to_be64(val64), target);
+	readq(target); /* flush */
+
+	bitmapsz = tbl->it_size / BITS_PER_BYTE;
+	free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
+	tbl->it_map = NULL;
+
+	kfree(tbl);
+	
+	set_pci_iommu(dev->bus, NULL);
+
+	/* Can't free bootmem allocated memory after system is up :-( */
+	bus_info[dev->bus->number].tce_space = NULL;
+}
+
+static void calgary_dump_error_regs(struct iommu_table *tbl)
+{
+	void __iomem *bbar = tbl->bbar;
+	void __iomem *target;
+	u32 csr, plssr;
+
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
+	csr = be32_to_cpu(readl(target));
+
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
+	plssr = be32_to_cpu(readl(target));
+
+	/* If no error, the agent ID in the CSR is not valid */
+	printk(KERN_EMERG "Calgary: DMA error on Calgary PHB 0x%x, "
+	       "0x%08x@CSR 0x%08x@PLSSR\n", tbl->it_busno, csr, plssr);
+}
+
+static void calioc2_dump_error_regs(struct iommu_table *tbl)
+{
+	void __iomem *bbar = tbl->bbar;
+	u32 csr, csmr, plssr, mck, rcstat;
+	void __iomem *target;
+	unsigned long phboff = phb_offset(tbl->it_busno);
+	unsigned long erroff;
+	u32 errregs[7];
+	int i;
+
+	/* dump CSR */
+	target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
+	csr = be32_to_cpu(readl(target));
+	/* dump PLSSR */
+	target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
+	plssr = be32_to_cpu(readl(target));
+	/* dump CSMR */
+	target = calgary_reg(bbar, phboff | 0x290);
+	csmr = be32_to_cpu(readl(target));
+	/* dump mck */
+	target = calgary_reg(bbar, phboff | 0x800);
+	mck = be32_to_cpu(readl(target));
+
+	printk(KERN_EMERG "Calgary: DMA error on CalIOC2 PHB 0x%x\n",
+	       tbl->it_busno);
+
+	printk(KERN_EMERG "Calgary: 0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
+	       csr, plssr, csmr, mck);
+
+	/* dump rest of error regs */
+	printk(KERN_EMERG "Calgary: ");
+	for (i = 0; i < ARRAY_SIZE(errregs); i++) {
+		/* err regs are at 0x810 - 0x870 */
+		erroff = (0x810 + (i * 0x10));
+		target = calgary_reg(bbar, phboff | erroff);
+		errregs[i] = be32_to_cpu(readl(target));
+		printk("0x%08x@0x%lx ", errregs[i], erroff);
+	}
+	printk("\n");
+
+	/* root complex status */
+	target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
+	rcstat = be32_to_cpu(readl(target));
+	printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
+	       PHB_ROOT_COMPLEX_STATUS);
+}
+
+static void calgary_watchdog(unsigned long data)
+{
+	struct pci_dev *dev = (struct pci_dev *)data;
+	struct iommu_table *tbl = pci_iommu(dev->bus);
+	void __iomem *bbar = tbl->bbar;
+	u32 val32;
+	void __iomem *target;
+
+	target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
+	val32 = be32_to_cpu(readl(target));
+
+	/* If no error, the agent ID in the CSR is not valid */
+	if (val32 & CSR_AGENT_MASK) {
+		tbl->chip_ops->dump_error_regs(tbl);
+
+		/* reset error */
+		writel(0, target);
+
+		/* Disable bus that caused the error */
+		target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
+				     PHB_CONFIG_RW_OFFSET);
+		val32 = be32_to_cpu(readl(target));
+		val32 |= PHB_SLOT_DISABLE;
+		writel(cpu_to_be32(val32), target);
+		readl(target); /* flush */
+	} else {
+		/* Reset the timer */
+		mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
+	}
+}
+
+static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
+	unsigned char busnum, unsigned long timeout)
+{
+	u64 val64;
+	void __iomem *target;
+	unsigned int phb_shift = ~0; /* silence gcc */
+	u64 mask;
+
+	switch (busno_to_phbid(busnum)) {
+	case 0: phb_shift = (63 - 19);
+		break;
+	case 1: phb_shift = (63 - 23);
+		break;
+	case 2: phb_shift = (63 - 27);
+		break;
+	case 3: phb_shift = (63 - 35);
+		break;
+	default:
+		BUG_ON(busno_to_phbid(busnum));
+	}
+
+	target = calgary_reg(bbar, CALGARY_CONFIG_REG);
+	val64 = be64_to_cpu(readq(target));
+
+	/* zero out this PHB's timer bits */
+	mask = ~(0xFUL << phb_shift);
+	val64 &= mask;
+	val64 |= (timeout << phb_shift);
+	writeq(cpu_to_be64(val64), target);
+	readq(target); /* flush */
+}
+
+static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
+{
+	unsigned char busnum = dev->bus->number;
+	void __iomem *bbar = tbl->bbar;
+	void __iomem *target;
+	u32 val;
+
+	/*
+	 * CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
+	 */
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
+	val = cpu_to_be32(readl(target));
+	val |= 0x00800000;
+	writel(cpu_to_be32(val), target);
+}
+
+static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
+{
+	unsigned char busnum = dev->bus->number;
+
+	/*
+	 * Give split completion a longer timeout on bus 1 for aic94xx
+	 * http://bugzilla.kernel.org/show_bug.cgi?id=7180
+	 */
+	if (is_calgary(dev->device) && (busnum == 1))
+		calgary_set_split_completion_timeout(tbl->bbar, busnum,
+						     CCR_2SEC_TIMEOUT);
+}
+
+static void __init calgary_enable_translation(struct pci_dev *dev)
+{
+	u32 val32;
+	unsigned char busnum;
+	void __iomem *target;
+	void __iomem *bbar;
+	struct iommu_table *tbl;
+
+	busnum = dev->bus->number;
+	tbl = pci_iommu(dev->bus);
+	bbar = tbl->bbar;
+
+	/* enable TCE in PHB Config Register */
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
+	val32 = be32_to_cpu(readl(target));
+	val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
+
+	printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
+	       (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
+	       "Calgary" : "CalIOC2", busnum);
+	printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
+	       "bus.\n");
+
+	writel(cpu_to_be32(val32), target);
+	readl(target); /* flush */
+
+	init_timer(&tbl->watchdog_timer);
+	tbl->watchdog_timer.function = &calgary_watchdog;
+	tbl->watchdog_timer.data = (unsigned long)dev;
+	mod_timer(&tbl->watchdog_timer, jiffies);
+}
+
+static void __init calgary_disable_translation(struct pci_dev *dev)
+{
+	u32 val32;
+	unsigned char busnum;
+	void __iomem *target;
+	void __iomem *bbar;
+	struct iommu_table *tbl;
+
+	busnum = dev->bus->number;
+	tbl = pci_iommu(dev->bus);
+	bbar = tbl->bbar;
+
+	/* disable TCE in PHB Config Register */
+	target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
+	val32 = be32_to_cpu(readl(target));
+	val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
+
+	printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
+	writel(cpu_to_be32(val32), target);
+	readl(target); /* flush */
+
+	del_timer_sync(&tbl->watchdog_timer);
+}
+
+static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
+{
+	pci_dev_get(dev);
+	set_pci_iommu(dev->bus, NULL);
+
+	/* is the device behind a bridge? */
+	if (dev->bus->parent)
+		dev->bus->parent->self = dev;
+	else
+		dev->bus->self = dev;
+}
+
+static int __init calgary_init_one(struct pci_dev *dev)
+{
+	void __iomem *bbar;
+	struct iommu_table *tbl;
+	int ret;
+
+	BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
+
+	bbar = busno_to_bbar(dev->bus->number);
+	ret = calgary_setup_tar(dev, bbar);
+	if (ret)
+		goto done;
+
+	pci_dev_get(dev);
+
+	if (dev->bus->parent) {
+		if (dev->bus->parent->self)
+			printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
+			       "bus->parent->self!\n", dev);
+		dev->bus->parent->self = dev;
+	} else
+		dev->bus->self = dev;
+
+	tbl = pci_iommu(dev->bus);
+	tbl->chip_ops->handle_quirks(tbl, dev);
+
+	calgary_enable_translation(dev);
+
+	return 0;
+
+done:
+	return ret;
+}
+
+static int __init calgary_locate_bbars(void)
+{
+	int ret;
+	int rioidx, phb, bus;
+	void __iomem *bbar;
+	void __iomem *target;
+	unsigned long offset;
+	u8 start_bus, end_bus;
+	u32 val;
+
+	ret = -ENODATA;
+	for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
+		struct rio_detail *rio = rio_devs[rioidx];
+
+		if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
+			continue;
+
+		/* map entire 1MB of Calgary config space */
+		bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
+		if (!bbar)
+			goto error;
+
+		for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
+			offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
+			target = calgary_reg(bbar, offset);
+
+			val = be32_to_cpu(readl(target));
+
+			start_bus = (u8)((val & 0x00FF0000) >> 16);
+			end_bus = (u8)((val & 0x0000FF00) >> 8);
+
+			if (end_bus) {
+				for (bus = start_bus; bus <= end_bus; bus++) {
+					bus_info[bus].bbar = bbar;
+					bus_info[bus].phbid = phb;
+				}
+			} else {
+				bus_info[start_bus].bbar = bbar;
+				bus_info[start_bus].phbid = phb;
+			}
+		}
+	}
+
+	return 0;
+
+error:
+	/* scan bus_info and iounmap any bbars we previously ioremap'd */
+	for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
+		if (bus_info[bus].bbar)
+			iounmap(bus_info[bus].bbar);
+
+	return ret;
+}
+
+static int __init calgary_init(void)
+{
+	int ret;
+	struct pci_dev *dev = NULL;
+	void *tce_space;
+
+	ret = calgary_locate_bbars();
+	if (ret)
+		return ret;
+
+	do {
+		dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
+		if (!dev)
+			break;
+		if (!is_cal_pci_dev(dev->device))
+			continue;
+		if (!translate_phb(dev)) {
+			calgary_init_one_nontraslated(dev);
+			continue;
+		}
+		tce_space = bus_info[dev->bus->number].tce_space;
+		if (!tce_space && !translate_empty_slots)
+			continue;
+
+		ret = calgary_init_one(dev);
+		if (ret)
+			goto error;
+	} while (1);
+
+	return ret;
+
+error:
+	do {
+		dev = pci_get_device_reverse(PCI_VENDOR_ID_IBM,
+					     PCI_ANY_ID, dev);
+		if (!dev)
+			break;
+		if (!is_cal_pci_dev(dev->device))
+			continue;
+		if (!translate_phb(dev)) {
+			pci_dev_put(dev);
+			continue;
+		}
+		if (!bus_info[dev->bus->number].tce_space && !translate_empty_slots)
+			continue;
+
+		calgary_disable_translation(dev);
+		calgary_free_bus(dev);
+		pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
+	} while (1);
+
+	return ret;
+}
+
+static inline int __init determine_tce_table_size(u64 ram)
+{
+	int ret;
+
+	if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
+		return specified_table_size;
+
+	/*
+	 * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
+	 * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
+	 * larger table size has twice as many entries, so shift the
+	 * max ram address by 13 to divide by 8K and then look at the
+	 * order of the result to choose between 0-7.
+	 */
+	ret = get_order(ram >> 13);
+	if (ret > TCE_TABLE_SIZE_8M)
+		ret = TCE_TABLE_SIZE_8M;
+
+	return ret;
+}
+
+static int __init build_detail_arrays(void)
+{
+	unsigned long ptr;
+	int i, scal_detail_size, rio_detail_size;
+
+	if (rio_table_hdr->num_scal_dev > MAX_NUMNODES){
+		printk(KERN_WARNING
+			"Calgary: MAX_NUMNODES too low! Defined as %d, "
+			"but system has %d nodes.\n",
+			MAX_NUMNODES, rio_table_hdr->num_scal_dev);
+		return -ENODEV;
+	}
+
+	switch (rio_table_hdr->version){
+	case 2:
+		scal_detail_size = 11;
+		rio_detail_size = 13;
+		break;
+	case 3:
+		scal_detail_size = 12;
+		rio_detail_size = 15;
+		break;
+	default:
+		printk(KERN_WARNING
+		       "Calgary: Invalid Rio Grande Table Version: %d\n",
+		       rio_table_hdr->version);
+		return -EPROTO;
+	}
+
+	ptr = ((unsigned long)rio_table_hdr) + 3;
+	for (i = 0; i < rio_table_hdr->num_scal_dev;
+		    i++, ptr += scal_detail_size)
+		scal_devs[i] = (struct scal_detail *)ptr;
+
+	for (i = 0; i < rio_table_hdr->num_rio_dev;
+		    i++, ptr += rio_detail_size)
+		rio_devs[i] = (struct rio_detail *)ptr;
+
+	return 0;
+}
+
+static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
+{
+	int dev;
+	u32 val;
+
+	if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
+		/*
+		 * FIXME: properly scan for devices accross the
+		 * PCI-to-PCI bridge on every CalIOC2 port.
+		 */
+		return 1;
+	}
+
+	for (dev = 1; dev < 8; dev++) {
+		val = read_pci_config(bus, dev, 0, 0);
+		if (val != 0xffffffff)
+			break;
+	}
+	return (val != 0xffffffff);
+}
+
+void __init detect_calgary(void)
+{
+	int bus;
+	void *tbl;
+	int calgary_found = 0;
+	unsigned long ptr;
+	unsigned int offset, prev_offset;
+	int ret;
+
+	/*
+	 * if the user specified iommu=off or iommu=soft or we found
+	 * another HW IOMMU already, bail out.
+	 */
+	if (swiotlb || no_iommu || iommu_detected)
+		return;
+
+	if (!use_calgary)
+		return;
+
+	if (!early_pci_allowed())
+		return;
+
+	printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
+
+	ptr = (unsigned long)phys_to_virt(get_bios_ebda());
+
+	rio_table_hdr = NULL;
+	prev_offset = 0;
+	offset = 0x180;
+	/*
+	 * The next offset is stored in the 1st word.
+	 * Only parse up until the offset increases:
+	 */
+	while (offset > prev_offset) {
+		/* The block id is stored in the 2nd word */
+		if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
+			/* set the pointer past the offset & block id */
+			rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
+			break;
+		}
+		prev_offset = offset;
+		offset = *((unsigned short *)(ptr + offset));
+	}
+	if (!rio_table_hdr) {
+		printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
+		       "in EBDA - bailing!\n");
+		return;
+	}
+
+	ret = build_detail_arrays();
+	if (ret) {
+		printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
+		return;
+	}
+
+	specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
+
+	for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
+		struct calgary_bus_info *info = &bus_info[bus];
+		unsigned short pci_device;
+		u32 val;
+
+		val = read_pci_config(bus, 0, 0, 0);
+		pci_device = (val & 0xFFFF0000) >> 16;
+
+		if (!is_cal_pci_dev(pci_device))
+			continue;
+
+		if (info->translation_disabled)
+			continue;
+
+		if (calgary_bus_has_devices(bus, pci_device) ||
+		    translate_empty_slots) {
+			tbl = alloc_tce_table();
+			if (!tbl)
+				goto cleanup;
+			info->tce_space = tbl;
+			calgary_found = 1;
+		}
+	}
+
+	printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
+	       calgary_found ? "found" : "not found");
+
+	if (calgary_found) {
+		iommu_detected = 1;
+		calgary_detected = 1;
+		printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
+		printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d, "
+		       "CONFIG_IOMMU_DEBUG is %s.\n", specified_table_size,
+		       debugging ? "enabled" : "disabled");
+	}
+	return;
+
+cleanup:
+	for (--bus; bus >= 0; --bus) {
+		struct calgary_bus_info *info = &bus_info[bus];
+
+		if (info->tce_space)
+			free_tce_table(info->tce_space);
+	}
+}
+
+int __init calgary_iommu_init(void)
+{
+	int ret;
+
+	if (no_iommu || swiotlb)
+		return -ENODEV;
+
+	if (!calgary_detected)
+		return -ENODEV;
+
+	/* ok, we're trying to use Calgary - let's roll */
+	printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
+
+	ret = calgary_init();
+	if (ret) {
+		printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
+		       "falling back to no_iommu\n", ret);
+		if (end_pfn > MAX_DMA32_PFN)
+			printk(KERN_ERR "WARNING more than 4GB of memory, "
+					"32bit PCI may malfunction.\n");
+		return ret;
+	}
+
+	force_iommu = 1;
+	bad_dma_address = 0x0;
+	dma_ops = &calgary_dma_ops;
+
+	return 0;
+}
+
+static int __init calgary_parse_options(char *p)
+{
+	unsigned int bridge;
+	size_t len;
+	char* endp;
+
+	while (*p) {
+		if (!strncmp(p, "64k", 3))
+			specified_table_size = TCE_TABLE_SIZE_64K;
+		else if (!strncmp(p, "128k", 4))
+			specified_table_size = TCE_TABLE_SIZE_128K;
+		else if (!strncmp(p, "256k", 4))
+			specified_table_size = TCE_TABLE_SIZE_256K;
+		else if (!strncmp(p, "512k", 4))
+			specified_table_size = TCE_TABLE_SIZE_512K;
+		else if (!strncmp(p, "1M", 2))
+			specified_table_size = TCE_TABLE_SIZE_1M;
+		else if (!strncmp(p, "2M", 2))
+			specified_table_size = TCE_TABLE_SIZE_2M;
+		else if (!strncmp(p, "4M", 2))
+			specified_table_size = TCE_TABLE_SIZE_4M;
+		else if (!strncmp(p, "8M", 2))
+			specified_table_size = TCE_TABLE_SIZE_8M;
+
+		len = strlen("translate_empty_slots");
+		if (!strncmp(p, "translate_empty_slots", len))
+			translate_empty_slots = 1;
+
+		len = strlen("disable");
+		if (!strncmp(p, "disable", len)) {
+			p += len;
+			if (*p == '=')
+				++p;
+			if (*p == '\0')
+				break;
+			bridge = simple_strtol(p, &endp, 0);
+			if (p == endp)
+				break;
+
+			if (bridge < MAX_PHB_BUS_NUM) {
+				printk(KERN_INFO "Calgary: disabling "
+				       "translation for PHB %#x\n", bridge);
+				bus_info[bridge].translation_disabled = 1;
+			}
+		}
+
+		p = strpbrk(p, ",");
+		if (!p)
+			break;
+
+		p++; /* skip ',' */
+	}
+	return 1;
+}
+__setup("calgary=", calgary_parse_options);
+
+static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
+{
+	struct iommu_table *tbl;
+	unsigned int npages;
+	int i;
+
+	tbl = pci_iommu(dev->bus);
+
+	for (i = 0; i < 4; i++) {
+		struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
+
+		/* Don't give out TCEs that map MEM resources */
+		if (!(r->flags & IORESOURCE_MEM))
+			continue;
+
+		/* 0-based? we reserve the whole 1st MB anyway */
+		if (!r->start)
+			continue;
+
+		/* cover the whole region */
+		npages = (r->end - r->start) >> PAGE_SHIFT;
+		npages++;
+
+		iommu_range_reserve(tbl, r->start, npages);
+	}
+}
+
+static int __init calgary_fixup_tce_spaces(void)
+{
+	struct pci_dev *dev = NULL;
+	void *tce_space;
+
+	if (no_iommu || swiotlb || !calgary_detected)
+		return -ENODEV;
+
+	printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
+
+	do {
+		dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
+		if (!dev)
+			break;
+		if (!is_cal_pci_dev(dev->device))
+			continue;
+		if (!translate_phb(dev))
+			continue;
+
+		tce_space = bus_info[dev->bus->number].tce_space;
+		if (!tce_space)
+			continue;
+
+		calgary_fixup_one_tce_space(dev);
+
+	} while (1);
+
+	return 0;
+}
+
+/*
+ * We need to be call after pcibios_assign_resources (fs_initcall level)
+ * and before device_initcall.
+ */
+rootfs_initcall(calgary_fixup_tce_spaces);