[ARM] Support register switch in nommu mode

[linux-2.6/verdex.git] / arch / powerpc / platforms / maple / pci.c

/*
 * 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 = pcibios_alloc_controller(dev);
        if (hose == NULL)
                return -ENOMEM;
        hose->first_busno = bus_range ? bus_range[0] : 0;
        hose->last_busno = bus_range ? bus_range[1] : 0xff;

        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);

        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);