1 files changed, 522 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c
new file mode 100644
index 000000000000..340c21caeae2
--- /dev/null
+++ b/arch/powerpc/platforms/maple/pci.c
@@ -0,0 +1,522 @@
+/*
+ * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
+ *		      IBM Corp.
+ *
+ * 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.
+ */
+
+#define DEBUG
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#include <asm/machdep.h>
+#include <asm/iommu.h>
+#include <asm/ppc-pci.h>
+
+#include "maple.h"
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+static struct pci_controller *u3_agp, *u3_ht;
+
+static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
+{
+	for (; node != 0;node = node->sibling) {
+		int * bus_range;
+		unsigned int *class_code;
+		int len;
+
+		/* For PCI<->PCI bridges or CardBus bridges, we go down */
+		class_code = (unsigned int *) get_property(node, "class-code", NULL);
+		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
+			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
+			continue;
+		bus_range = (int *) get_property(node, "bus-range", &len);
+		if (bus_range != NULL && len > 2 * sizeof(int)) {
+			if (bus_range[1] > higher)
+				higher = bus_range[1];
+		}
+		higher = fixup_one_level_bus_range(node->child, higher);
+	}
+	return higher;
+}
+
+/* This routine fixes the "bus-range" property of all bridges in the
+ * system since they tend to have their "last" member wrong on macs
+ *
+ * Note that the bus numbers manipulated here are OF bus numbers, they
+ * are not Linux bus numbers.
+ */
+static void __init fixup_bus_range(struct device_node *bridge)
+{
+	int * bus_range;
+	int len;
+
+	/* Lookup the "bus-range" property for the hose */
+	bus_range = (int *) get_property(bridge, "bus-range", &len);
+	if (bus_range == NULL || len < 2 * sizeof(int)) {
+		printk(KERN_WARNING "Can't get bus-range for %s\n",
+			       bridge->full_name);
+		return;
+	}
+	bus_range[1] = fixup_one_level_bus_range(bridge->child, bus_range[1]);
+}
+
+
+#define U3_AGP_CFA0(devfn, off)	\
+	((1 << (unsigned long)PCI_SLOT(dev_fn)) \
+	| (((unsigned long)PCI_FUNC(dev_fn)) << 8) \
+	| (((unsigned long)(off)) & 0xFCUL))
+
+#define U3_AGP_CFA1(bus, devfn, off)	\
+	((((unsigned long)(bus)) << 16) \
+	|(((unsigned long)(devfn)) << 8) \
+	|(((unsigned long)(off)) & 0xFCUL) \
+	|1UL)
+
+static unsigned long u3_agp_cfg_access(struct pci_controller* hose,
+				       u8 bus, u8 dev_fn, u8 offset)
+{
+	unsigned int caddr;
+
+	if (bus == hose->first_busno) {
+		if (dev_fn < (11 << 3))
+			return 0;
+		caddr = U3_AGP_CFA0(dev_fn, offset);
+	} else
+		caddr = U3_AGP_CFA1(bus, dev_fn, offset);
+
+	/* Uninorth will return garbage if we don't read back the value ! */
+	do {
+		out_le32(hose->cfg_addr, caddr);
+	} while (in_le32(hose->cfg_addr) != caddr);
+
+	offset &= 0x07;
+	return ((unsigned long)hose->cfg_data) + offset;
+}
+
+static int u3_agp_read_config(struct pci_bus *bus, unsigned int devfn,
+			      int offset, int len, u32 *val)
+{
+	struct pci_controller *hose;
+	unsigned long addr;
+
+	hose = pci_bus_to_host(bus);
+	if (hose == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	/*
+	 * Note: the caller has already checked that offset is
+	 * suitably aligned and that len is 1, 2 or 4.
+	 */
+	switch (len) {
+	case 1:
+		*val = in_8((u8 *)addr);
+		break;
+	case 2:
+		*val = in_le16((u16 *)addr);
+		break;
+	default:
+		*val = in_le32((u32 *)addr);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int u3_agp_write_config(struct pci_bus *bus, unsigned int devfn,
+			       int offset, int len, u32 val)
+{
+	struct pci_controller *hose;
+	unsigned long addr;
+
+	hose = pci_bus_to_host(bus);
+	if (hose == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	addr = u3_agp_cfg_access(hose, bus->number, devfn, offset);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	/*
+	 * Note: the caller has already checked that offset is
+	 * suitably aligned and that len is 1, 2 or 4.
+	 */
+	switch (len) {
+	case 1:
+		out_8((u8 *)addr, val);
+		(void) in_8((u8 *)addr);
+		break;
+	case 2:
+		out_le16((u16 *)addr, val);
+		(void) in_le16((u16 *)addr);
+		break;
+	default:
+		out_le32((u32 *)addr, val);
+		(void) in_le32((u32 *)addr);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops u3_agp_pci_ops =
+{
+	u3_agp_read_config,
+	u3_agp_write_config
+};
+
+
+#define U3_HT_CFA0(devfn, off)		\
+		((((unsigned long)devfn) << 8) | offset)
+#define U3_HT_CFA1(bus, devfn, off)	\
+		(U3_HT_CFA0(devfn, off) \
+		+ (((unsigned long)bus) << 16) \
+		+ 0x01000000UL)
+
+static unsigned long u3_ht_cfg_access(struct pci_controller* hose,
+				      u8 bus, u8 devfn, u8 offset)
+{
+	if (bus == hose->first_busno) {
+		if (PCI_SLOT(devfn) == 0)
+			return 0;
+		return ((unsigned long)hose->cfg_data) + U3_HT_CFA0(devfn, offset);
+	} else
+		return ((unsigned long)hose->cfg_data) + U3_HT_CFA1(bus, devfn, offset);
+}
+
+static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
+			     int offset, int len, u32 *val)
+{
+	struct pci_controller *hose;
+	unsigned long addr;
+
+	hose = pci_bus_to_host(bus);
+	if (hose == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	/*
+	 * Note: the caller has already checked that offset is
+	 * suitably aligned and that len is 1, 2 or 4.
+	 */
+	switch (len) {
+	case 1:
+		*val = in_8((u8 *)addr);
+		break;
+	case 2:
+		*val = in_le16((u16 *)addr);
+		break;
+	default:
+		*val = in_le32((u32 *)addr);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
+			      int offset, int len, u32 val)
+{
+	struct pci_controller *hose;
+	unsigned long addr;
+
+	hose = pci_bus_to_host(bus);
+	if (hose == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	addr = u3_ht_cfg_access(hose, bus->number, devfn, offset);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	/*
+	 * Note: the caller has already checked that offset is
+	 * suitably aligned and that len is 1, 2 or 4.
+	 */
+	switch (len) {
+	case 1:
+		out_8((u8 *)addr, val);
+		(void) in_8((u8 *)addr);
+		break;
+	case 2:
+		out_le16((u16 *)addr, val);
+		(void) in_le16((u16 *)addr);
+		break;
+	default:
+		out_le32((u32 *)addr, val);
+		(void) in_le32((u32 *)addr);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops u3_ht_pci_ops =
+{
+	u3_ht_read_config,
+	u3_ht_write_config
+};
+
+static void __init setup_u3_agp(struct pci_controller* hose)
+{
+	/* On G5, we move AGP up to high bus number so we don't need
+	 * to reassign bus numbers for HT. If we ever have P2P bridges
+	 * on AGP, we'll have to move pci_assign_all_buses to the
+	 * pci_controller structure so we enable it for AGP and not for
+	 * HT childs.
+	 * We hard code the address because of the different size of
+	 * the reg address cell, we shall fix that by killing struct
+	 * reg_property and using some accessor functions instead
+	 */
+	hose->first_busno = 0xf0;
+	hose->last_busno = 0xff;
+	hose->ops = &u3_agp_pci_ops;
+	hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
+	hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);
+
+	u3_agp = hose;
+}
+
+static void __init setup_u3_ht(struct pci_controller* hose)
+{
+	hose->ops = &u3_ht_pci_ops;
+
+	/* We hard code the address because of the different size of
+	 * the reg address cell, we shall fix that by killing struct
+	 * reg_property and using some accessor functions instead
+	 */
+	hose->cfg_data = (volatile unsigned char *)ioremap(0xf2000000, 0x02000000);
+
+	hose->first_busno = 0;
+	hose->last_busno = 0xef;
+
+	u3_ht = hose;
+}
+
+static int __init add_bridge(struct device_node *dev)
+{
+	int len;
+	struct pci_controller *hose;
+	char* disp_name;
+	int *bus_range;
+	int primary = 1;
+	struct property *of_prop;
+
+	DBG("Adding PCI host bridge %s\n", dev->full_name);
+
+	bus_range = (int *) get_property(dev, "bus-range", &len);
+	if (bus_range == NULL || len < 2 * sizeof(int)) {
+		printk(KERN_WARNING "Can't get bus-range for %s, assume bus 0\n",
+		dev->full_name);
+	}
+
+	hose = alloc_bootmem(sizeof(struct pci_controller));
+	if (hose == NULL)
+		return -ENOMEM;
+	pci_setup_pci_controller(hose);
+
+	hose->arch_data = dev;
+	hose->first_busno = bus_range ? bus_range[0] : 0;
+	hose->last_busno = bus_range ? bus_range[1] : 0xff;
+
+	of_prop = alloc_bootmem(sizeof(struct property) +
+				sizeof(hose->global_number));
+	if (of_prop) {
+		memset(of_prop, 0, sizeof(struct property));
+		of_prop->name = "linux,pci-domain";
+		of_prop->length = sizeof(hose->global_number);
+		of_prop->value = (unsigned char *)&of_prop[1];
+		memcpy(of_prop->value, &hose->global_number, sizeof(hose->global_number));
+		prom_add_property(dev, of_prop);
+	}
+
+	disp_name = NULL;
+	if (device_is_compatible(dev, "u3-agp")) {
+		setup_u3_agp(hose);
+		disp_name = "U3-AGP";
+		primary = 0;
+	} else if (device_is_compatible(dev, "u3-ht")) {
+		setup_u3_ht(hose);
+		disp_name = "U3-HT";
+		primary = 1;
+	}
+	printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
+		disp_name, hose->first_busno, hose->last_busno);
+
+	/* Interpret the "ranges" property */
+	/* This also maps the I/O region and sets isa_io/mem_base */
+	pci_process_bridge_OF_ranges(hose, dev, primary);
+	pci_setup_phb_io(hose, primary);
+
+	/* Fixup "bus-range" OF property */
+	fixup_bus_range(dev);
+
+	return 0;
+}
+
+
+void __init maple_pcibios_fixup(void)
+{
+	struct pci_dev *dev = NULL;
+
+	DBG(" -> maple_pcibios_fixup\n");
+
+	for_each_pci_dev(dev)
+		pci_read_irq_line(dev);
+
+	/* Do the mapping of the IO space */
+	phbs_remap_io();
+
+	DBG(" <- maple_pcibios_fixup\n");
+}
+
+static void __init maple_fixup_phb_resources(void)
+{
+	struct pci_controller *hose, *tmp;
+	
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
+		unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;
+		hose->io_resource.start += offset;
+		hose->io_resource.end += offset;
+		printk(KERN_INFO "PCI Host %d, io start: %lx; io end: %lx\n",
+		       hose->global_number,
+		       hose->io_resource.start, hose->io_resource.end);
+	}
+}
+
+void __init maple_pci_init(void)
+{
+	struct device_node *np, *root;
+	struct device_node *ht = NULL;
+
+	/* Probe root PCI hosts, that is on U3 the AGP host and the
+	 * HyperTransport host. That one is actually "kept" around
+	 * and actually added last as it's resource management relies
+	 * on the AGP resources to have been setup first
+	 */
+	root = of_find_node_by_path("/");
+	if (root == NULL) {
+		printk(KERN_CRIT "maple_find_bridges: can't find root of device tree\n");
+		return;
+	}
+	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) {
+		if (np->name == NULL)
+			continue;
+		if (strcmp(np->name, "pci") == 0) {
+			if (add_bridge(np) == 0)
+				of_node_get(np);
+		}
+		if (strcmp(np->name, "ht") == 0) {
+			of_node_get(np);
+			ht = np;
+		}
+	}
+	of_node_put(root);
+
+	/* Now setup the HyperTransport host if we found any
+	 */
+	if (ht && add_bridge(ht) != 0)
+		of_node_put(ht);
+
+	/* Fixup the IO resources on our host bridges as the common code
+	 * does it only for childs of the host bridges
+	 */
+	maple_fixup_phb_resources();
+
+	/* Setup the linkage between OF nodes and PHBs */ 
+	pci_devs_phb_init();
+
+	/* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
+	 * assume there is no P2P bridge on the AGP bus, which should be a
+	 * safe assumptions hopefully.
+	 */
+	if (u3_agp) {
+		struct device_node *np = u3_agp->arch_data;
+		PCI_DN(np)->busno = 0xf0;
+		for (np = np->child; np; np = np->sibling)
+			PCI_DN(np)->busno = 0xf0;
+	}
+
+	/* Tell pci.c to use the common resource allocation mecanism */
+	pci_probe_only = 0;
+	
+	/* Allow all IO */
+	io_page_mask = -1;
+}
+
+int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
+{
+	struct device_node *np;
+	int irq = channel ? 15 : 14;
+
+	if (pdev->vendor != PCI_VENDOR_ID_AMD ||
+	    pdev->device != PCI_DEVICE_ID_AMD_8111_IDE)
+		return irq;
+
+	np = pci_device_to_OF_node(pdev);
+	if (np == NULL)
+		return irq;
+	if (np->n_intrs < 2)
+		return irq;
+	return np->intrs[channel & 0x1].line;
+}
+
+/* XXX: To remove once all firmwares are ok */
+static void fixup_maple_ide(struct pci_dev* dev)
+{
+#if 0 /* Enable this to enable IDE port 0 */
+	{
+		u8 v;
+
+		pci_read_config_byte(dev, 0x40, &v);
+		v |= 2;
+		pci_write_config_byte(dev, 0x40, v);
+	}
+#endif
+#if 0 /* fix bus master base */
+	pci_write_config_dword(dev, 0x20, 0xcc01);
+	printk("old ide resource: %lx -> %lx \n",
+	       dev->resource[4].start, dev->resource[4].end);
+	dev->resource[4].start = 0xcc00;
+	dev->resource[4].end = 0xcc10;
+#endif
+#if 1 /* Enable this to fixup IDE sense/polarity of irqs in IO-APICs */
+	{
+		struct pci_dev *apicdev;
+		u32 v;
+
+		apicdev = pci_get_slot (dev->bus, PCI_DEVFN(5,0));
+		if (apicdev == NULL)
+			printk("IDE Fixup IRQ: Can't find IO-APIC !\n");
+		else {
+			pci_write_config_byte(apicdev, 0xf2, 0x10 + 2*14);
+			pci_read_config_dword(apicdev, 0xf4, &v);
+			v &= ~0x00000022;
+			pci_write_config_dword(apicdev, 0xf4, v);
+			pci_write_config_byte(apicdev, 0xf2, 0x10 + 2*15);
+			pci_read_config_dword(apicdev, 0xf4, &v);
+			v &= ~0x00000022;
+			pci_write_config_dword(apicdev, 0xf4, v);
+			pci_dev_put(apicdev);
+		}
+	}
+#endif
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_IDE,
+			 fixup_maple_ide);