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
6 * Copyright (C) 2003 Christoph Hellwig (hch@lst.de)
7 * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <asm/sn/arch.h>
14 #include <asm/pci/bridge.h>
15 #include <asm/paccess.h>
16 #include <asm/sn/intr.h>
17 #include <asm/sn/sn0/hub.h>
19 extern unsigned int allocate_irqno(void);
22 * Max #PCI busses we can handle; ie, max #PCI bridges.
24 #define MAX_PCI_BUSSES 40
27 * Max #PCI devices (like scsi controllers) we handle on a bus.
29 #define MAX_DEVICES_PER_PCIBUS 8
32 * XXX: No kmalloc available when we do our crosstalk scan,
33 * we should try to move it later in the boot process.
35 static struct bridge_controller bridges[MAX_PCI_BUSSES];
38 * Translate from irq to software PCI bus number and PCI slot.
40 struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
41 int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
43 extern struct pci_ops bridge_pci_ops;
45 int __init bridge_probe(nasid_t nasid, int widget_id, int masterwid)
47 unsigned long offset = NODE_OFFSET(nasid);
48 struct bridge_controller *bc;
49 static int num_bridges = 0;
55 /* XXX: kludge alert.. */
57 ioport_resource.end = ~0UL;
59 bc = &bridges[num_bridges];
61 bc->pc.pci_ops = &bridge_pci_ops;
62 bc->pc.mem_resource = &bc->mem;
63 bc->pc.io_resource = &bc->io;
65 bc->pc.index = num_bridges;
67 bc->mem.name = "Bridge PCI MEM";
68 bc->pc.mem_offset = offset;
71 bc->mem.flags = IORESOURCE_MEM;
73 bc->io.name = "Bridge IO MEM";
74 bc->pc.io_offset = offset;
77 bc->io.flags = IORESOURCE_IO;
79 bc->irq_cpu = smp_processor_id();
80 bc->widget_id = widget_id;
83 bc->baddr = (u64)masterwid << 60 | PCI64_ATTR_BAR;
86 * point to this bridge
88 bridge = (bridge_t *) RAW_NODE_SWIN_BASE(nasid, widget_id);
91 * Clear all pending interrupts.
93 bridge->b_int_rst_stat = BRIDGE_IRR_ALL_CLR;
96 * Until otherwise set up, assume all interrupts are from slot 0
98 bridge->b_int_device = 0x0;
101 * swap pio's to pci mem and io space (big windows)
103 bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP |
104 BRIDGE_CTRL_MEM_SWAP;
107 * Hmm... IRIX sets additional bits in the address which
108 * are documented as reserved in the bridge docs.
110 bridge->b_wid_int_upper = 0x8000 | (masterwid << 16);
111 bridge->b_wid_int_lower = 0x01800090; /* PI_INT_PEND_MOD off*/
112 bridge->b_dir_map = (masterwid << 20); /* DMA */
113 bridge->b_int_enable = 0;
115 for (slot = 0; slot < 8; slot ++) {
116 bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
117 bc->pci_int[slot] = -1;
119 bridge->b_wid_tflush; /* wait until Bridge PIO complete */
123 register_pci_controller(&bc->pc);
131 * All observed requests have pin == 1. We could have a global here, that
132 * gets incremented and returned every time - unfortunately, pci_map_irq
133 * may be called on the same device over and over, and need to return the
134 * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
136 * A given PCI device, in general, should be able to intr any of the cpus
137 * on any one of the hubs connected to its xbow.
139 int __devinit pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
141 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
142 int irq = bc->pci_int[slot];
145 irq = bc->pci_int[slot] = request_bridge_irq(bc);
147 panic("Can't allocate interrupt for PCI device %s\n",
151 irq_to_bridge[irq] = bc;
152 irq_to_slot[irq] = slot;
157 /* Do platform specific device initialization at pci_enable_device() time */
158 int pcibios_plat_dev_init(struct pci_dev *dev)
164 * Device might live on a subordinate PCI bus. XXX Walk up the chain of buses
165 * to find the slot number in sense of the bridge device register.
166 * XXX This also means multiple devices might rely on conflicting bridge
170 static inline void pci_disable_swapping(struct pci_dev *dev)
172 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
173 bridge_t *bridge = bc->base;
174 int slot = PCI_SLOT(dev->devfn);
176 /* Turn off byte swapping */
177 bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR;
178 bridge->b_widget.w_tflush; /* Flush */
181 static inline void pci_enable_swapping(struct pci_dev *dev)
183 struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
184 bridge_t *bridge = bc->base;
185 int slot = PCI_SLOT(dev->devfn);
187 /* Turn on byte swapping */
188 bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
189 bridge->b_widget.w_tflush; /* Flush */
192 static void __init pci_fixup_ioc3(struct pci_dev *d)
194 pci_disable_swapping(d);
197 int pcibus_to_node(struct pci_bus *bus)
199 struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
204 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,