mv64x60_pci.c

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/*
 * PCI bus setup for Marvell mv64360/mv64460 host bridges (Discovery)
 *
 * Author: Dale Farnsworth <[email protected]>
 *
 * 2007 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/pci.h>

#include <asm/prom.h>
#include <asm/pci-bridge.h>

#define PCI_HEADER_TYPE_INVALID     0x7f    /* Invalid PCI header type */

#ifdef CONFIG_SYSFS
/* 32-bit hex or dec stringified number + '\n' */
#define MV64X60_VAL_LEN_MAX     11
#define MV64X60_PCICFG_CPCI_HOTSWAP 0x68

static ssize_t mv64x60_hs_reg_read(struct file *filp, struct kobject *kobj,
                   struct bin_attribute *attr, char *buf,
                   loff_t off, size_t count)
{
    struct pci_dev *phb;
    u32 v;

    if (off > 0)
        return 0;
    if (count < MV64X60_VAL_LEN_MAX)
        return -EINVAL;

    phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
    if (!phb)
        return -ENODEV;
    pci_read_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, &v);
    pci_dev_put(phb);

    return sprintf(buf, "0x%08x\n", v);
}

static ssize_t mv64x60_hs_reg_write(struct file *filp, struct kobject *kobj,
                    struct bin_attribute *attr, char *buf,
                    loff_t off, size_t count)
{
    struct pci_dev *phb;
    u32 v;

    if (off > 0)
        return 0;
    if (count <= 0)
        return -EINVAL;

    if (sscanf(buf, "%i", &v) != 1)
        return -EINVAL;

    phb = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
    if (!phb)
        return -ENODEV;
    pci_write_config_dword(phb, MV64X60_PCICFG_CPCI_HOTSWAP, v);
    pci_dev_put(phb);

    return count;
}

static struct bin_attribute mv64x60_hs_reg_attr = { /* Hotswap register */
    .attr = {
        .name = "hs_reg",
        .mode = S_IRUGO | S_IWUSR,
    },
    .size  = MV64X60_VAL_LEN_MAX,
    .read  = mv64x60_hs_reg_read,
    .write = mv64x60_hs_reg_write,
};

static int __init mv64x60_sysfs_init(void)
{
    struct device_node *np;
    struct platform_device *pdev;
    const unsigned int *prop;

    np = of_find_compatible_node(NULL, NULL, "marvell,mv64360");
    if (!np)
        return 0;

    prop = of_get_property(np, "hs_reg_valid", NULL);
    of_node_put(np);

    pdev = platform_device_register_simple("marvell,mv64360", 0, NULL, 0);
    if (IS_ERR(pdev))
        return PTR_ERR(pdev);

    return sysfs_create_bin_file(&pdev->dev.kobj, &mv64x60_hs_reg_attr);
}

subsys_initcall(mv64x60_sysfs_init);

#endif /* CONFIG_SYSFS */

static void __devinit mv64x60_pci_fixup_early(struct pci_dev *dev)
{
    /*
     * Set the host bridge hdr_type to an invalid value so that
     * pci_setup_device() will ignore the host bridge.
     */
    dev->hdr_type = PCI_HEADER_TYPE_INVALID;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64360,
            mv64x60_pci_fixup_early);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64460,
            mv64x60_pci_fixup_early);

static int __init mv64x60_add_bridge(struct device_node *dev)
{
    int len;
    struct pci_controller *hose;
    struct resource rsrc;
    const int *bus_range;
    int primary;

    memset(&rsrc, 0, sizeof(rsrc));

    /* Fetch host bridge registers address */
    if (of_address_to_resource(dev, 0, &rsrc)) {
        printk(KERN_ERR "No PCI reg property in device tree\n");
        return -ENODEV;
    }

    /* Get bus range if any */
    bus_range = of_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)
        return -ENOMEM;

    hose->first_busno = bus_range ? bus_range[0] : 0;
    hose->last_busno = bus_range ? bus_range[1] : 0xff;

    setup_indirect_pci(hose, rsrc.start, rsrc.start + 4, 0);
    hose->self_busno = hose->first_busno;

    printk(KERN_INFO "Found MV64x60 PCI host bridge at 0x%016llx. "
           "Firmware bus number: %d->%d\n",
           (unsigned long long)rsrc.start, hose->first_busno,
           hose->last_busno);

    /* Interpret the "ranges" property */
    /* This also maps the I/O region and sets isa_io/mem_base */
    primary = (hose->first_busno == 0);
    pci_process_bridge_OF_ranges(hose, dev, primary);

    return 0;
}

void __init mv64x60_pci_init(void)
{
    struct device_node *np;

    for_each_compatible_node(np, "pci", "marvell,mv64360-pci")
        mv64x60_add_bridge(np);
}