diff options
Diffstat (limited to 'kernel/arch/powerpc/sysdev/mv64x60_pci.c')
| -rw-r--r-- | kernel/arch/powerpc/sysdev/mv64x60_pci.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/sysdev/mv64x60_pci.c b/kernel/arch/powerpc/sysdev/mv64x60_pci.c new file mode 100644 index 000000000..330d56613 --- /dev/null +++ b/kernel/arch/powerpc/sysdev/mv64x60_pci.c @@ -0,0 +1,171 @@ +/* + * PCI bus setup for Marvell mv64360/mv64460 host bridges (Discovery) + * + * Author: Dale Farnsworth <dale@farnsworth.org> + * + * 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 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); +} |