diff options
Diffstat (limited to 'arch/sh64/kernel/pcibios.c')
| -rw-r--r-- | arch/sh64/kernel/pcibios.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/sh64/kernel/pcibios.c b/arch/sh64/kernel/pcibios.c new file mode 100644 index 00000000000..50c61dcb9fa --- /dev/null +++ b/arch/sh64/kernel/pcibios.c @@ -0,0 +1,168 @@ +/* + * $Id: pcibios.c,v 1.1 2001/08/24 12:38:19 dwmw2 Exp $ + * + * arch/sh/kernel/pcibios.c + * + * Copyright (C) 2002 STMicroelectronics Limited + * Author : David J. McKay + * + * Copyright (C) 2004 Richard Curnow, SuperH UK Limited + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * This is GPL'd. + * + * Provided here are generic versions of: + * pcibios_update_resource() + * pcibios_align_resource() + * pcibios_enable_device() + * pcibios_set_master() + * pcibios_update_irq() + * + * These functions are collected here to reduce duplication of common + * code amongst the many platform-specific PCI support code files. + * + * Platform-specific files are expected to provide: + * pcibios_fixup_bus() + * pcibios_init() + * pcibios_setup() + * pcibios_fixup_pbus_ranges() + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/init.h> + +void +pcibios_update_resource(struct pci_dev *dev, struct resource *root, + struct resource *res, int resource) +{ + u32 new, check; + int reg; + + new = res->start | (res->flags & PCI_REGION_FLAG_MASK); + if (resource < 6) { + reg = PCI_BASE_ADDRESS_0 + 4*resource; + } else if (resource == PCI_ROM_RESOURCE) { + res->flags |= IORESOURCE_ROM_ENABLE; + new |= PCI_ROM_ADDRESS_ENABLE; + reg = dev->rom_base_reg; + } else { + /* Somebody might have asked allocation of a non-standard resource */ + return; + } + + pci_write_config_dword(dev, reg, new); + pci_read_config_dword(dev, reg, &check); + if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) { + printk(KERN_ERR "PCI: Error while updating region " + "%s/%d (%08x != %08x)\n", pci_name(dev), resource, + new, check); + } +} + +/* + * We need to avoid collisions with `mirrored' VGA ports + * and other strange ISA hardware, so we always want the + * addresses to be allocated in the 0x000-0x0ff region + * modulo 0x400. + */ +void pcibios_align_resource(void *data, struct resource *res, + unsigned long size, unsigned long align) +{ + if (res->flags & IORESOURCE_IO) { + unsigned long start = res->start; + + if (start & 0x300) { + start = (start + 0x3ff) & ~0x3ff; + res->start = start; + } + } +} + +static void pcibios_enable_bridge(struct pci_dev *dev) +{ + struct pci_bus *bus = dev->subordinate; + u16 cmd, old_cmd; + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + old_cmd = cmd; + + if (bus->resource[0]->flags & IORESOURCE_IO) { + cmd |= PCI_COMMAND_IO; + } + if ((bus->resource[1]->flags & IORESOURCE_MEM) || + (bus->resource[2]->flags & IORESOURCE_PREFETCH)) { + cmd |= PCI_COMMAND_MEMORY; + } + + if (cmd != old_cmd) { + pci_write_config_word(dev, PCI_COMMAND, cmd); + } + + printk("PCI bridge %s, command register -> %04x\n", + pci_name(dev), cmd); + +} + + + +int pcibios_enable_device(struct pci_dev *dev, int mask) +{ + u16 cmd, old_cmd; + int idx; + struct resource *r; + + if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { + pcibios_enable_bridge(dev); + } + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + old_cmd = cmd; + for(idx=0; idx<6; idx++) { + if (!(mask & (1 << idx))) + continue; + r = &dev->resource[idx]; + if (!r->start && r->end) { + printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev)); + return -EINVAL; + } + if (r->flags & IORESOURCE_IO) + cmd |= PCI_COMMAND_IO; + if (r->flags & IORESOURCE_MEM) + cmd |= PCI_COMMAND_MEMORY; + } + if (dev->resource[PCI_ROM_RESOURCE].start) + cmd |= PCI_COMMAND_MEMORY; + if (cmd != old_cmd) { + printk(KERN_INFO "PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd); + pci_write_config_word(dev, PCI_COMMAND, cmd); + } + return 0; +} + +/* + * If we set up a device for bus mastering, we need to check and set + * the latency timer as it may not be properly set. + */ +unsigned int pcibios_max_latency = 255; + +void pcibios_set_master(struct pci_dev *dev) +{ + u8 lat; + pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); + if (lat < 16) + lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; + else if (lat > pcibios_max_latency) + lat = pcibios_max_latency; + else + return; + printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat); + pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); +} + +void __init pcibios_update_irq(struct pci_dev *dev, int irq) +{ + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); +} |