diff options
Diffstat (limited to 'arch/m68k/kernel/bios32.c')
| -rw-r--r-- | arch/m68k/kernel/bios32.c | 514 |
1 files changed, 0 insertions, 514 deletions
diff --git a/arch/m68k/kernel/bios32.c b/arch/m68k/kernel/bios32.c deleted file mode 100644 index af170c2b..0000000 --- a/arch/m68k/kernel/bios32.c +++ /dev/null @@ -1,514 +0,0 @@ -/* - * bios32.c - PCI BIOS functions for m68k systems. - * - * Written by Wout Klaren. - * - * Based on the DEC Alpha bios32.c by Dave Rusling and David Mosberger. - */ - -#include <linux/init.h> -#include <linux/kernel.h> - -#if 0 -# define DBG_DEVS(args) printk args -#else -# define DBG_DEVS(args) -#endif - -#ifdef CONFIG_PCI - -/* - * PCI support for Linux/m68k. Currently only the Hades is supported. - * - * The support for PCI bridges in the DEC Alpha version has - * been removed in this version. - */ - -#include <linux/pci.h> -#include <linux/slab.h> -#include <linux/mm.h> - -#include <asm/io.h> -#include <asm/pci.h> -#include <asm/uaccess.h> - -#define KB 1024 -#define MB (1024*KB) -#define GB (1024*MB) - -#define MAJOR_REV 0 -#define MINOR_REV 5 - -/* - * Align VAL to ALIGN, which must be a power of two. - */ - -#define ALIGN(val,align) (((val) + ((align) - 1)) & ~((align) - 1)) - -/* - * Offsets relative to the I/O and memory base addresses from where resources - * are allocated. - */ - -#define IO_ALLOC_OFFSET 0x00004000 -#define MEM_ALLOC_OFFSET 0x04000000 - -/* - * Declarations of hardware specific initialisation functions. - */ - -extern struct pci_bus_info *init_hades_pci(void); - -/* - * Bus info structure of the PCI bus. A pointer to this structure is - * put in the sysdata member of the pci_bus structure. - */ - -static struct pci_bus_info *bus_info; - -static int pci_modify = 1; /* If set, layout the PCI bus ourself. */ -static int skip_vga; /* If set do not modify base addresses - of vga cards.*/ -static int disable_pci_burst; /* If set do not allow PCI bursts. */ - -static unsigned int io_base; -static unsigned int mem_base; - -/* - * static void disable_dev(struct pci_dev *dev) - * - * Disable PCI device DEV so that it does not respond to I/O or memory - * accesses. - * - * Parameters: - * - * dev - device to disable. - */ - -static void __init disable_dev(struct pci_dev *dev) -{ - unsigned short cmd; - - if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) || - (dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) || - (dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga) - return; - - pci_read_config_word(dev, PCI_COMMAND, &cmd); - - cmd &= (~PCI_COMMAND_IO & ~PCI_COMMAND_MEMORY & ~PCI_COMMAND_MASTER); - pci_write_config_word(dev, PCI_COMMAND, cmd); -} - -/* - * static void layout_dev(struct pci_dev *dev) - * - * Layout memory and I/O for a device. - * - * Parameters: - * - * device - device to layout memory and I/O for. - */ - -static void __init layout_dev(struct pci_dev *dev) -{ - unsigned short cmd; - unsigned int base, mask, size, reg; - unsigned int alignto; - int i; - - /* - * Skip video cards if requested. - */ - - if (((dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA) || - (dev->class >> 8 == PCI_CLASS_DISPLAY_VGA) || - (dev->class >> 8 == PCI_CLASS_DISPLAY_XGA)) && skip_vga) - return; - - pci_read_config_word(dev, PCI_COMMAND, &cmd); - - for (reg = PCI_BASE_ADDRESS_0, i = 0; reg <= PCI_BASE_ADDRESS_5; reg += 4, i++) - { - /* - * Figure out how much space and of what type this - * device wants. - */ - - pci_write_config_dword(dev, reg, 0xffffffff); - pci_read_config_dword(dev, reg, &base); - - if (!base) - { - /* this base-address register is unused */ - dev->resource[i].start = 0; - dev->resource[i].end = 0; - dev->resource[i].flags = 0; - continue; - } - - /* - * We've read the base address register back after - * writing all ones and so now we must decode it. - */ - - if (base & PCI_BASE_ADDRESS_SPACE_IO) - { - /* - * I/O space base address register. - */ - - cmd |= PCI_COMMAND_IO; - - base &= PCI_BASE_ADDRESS_IO_MASK; - mask = (~base << 1) | 0x1; - size = (mask & base) & 0xffffffff; - - /* - * Align to multiple of size of minimum base. - */ - - alignto = max_t(unsigned int, 0x040, size); - base = ALIGN(io_base, alignto); - io_base = base + size; - pci_write_config_dword(dev, reg, base | PCI_BASE_ADDRESS_SPACE_IO); - - dev->resource[i].start = base; - dev->resource[i].end = dev->resource[i].start + size - 1; - dev->resource[i].flags = IORESOURCE_IO | PCI_BASE_ADDRESS_SPACE_IO; - - DBG_DEVS(("layout_dev: IO address: %lX\n", base)); - } - else - { - unsigned int type; - - /* - * Memory space base address register. - */ - - cmd |= PCI_COMMAND_MEMORY; - type = base & PCI_BASE_ADDRESS_MEM_TYPE_MASK; - base &= PCI_BASE_ADDRESS_MEM_MASK; - mask = (~base << 1) | 0x1; - size = (mask & base) & 0xffffffff; - switch (type) - { - case PCI_BASE_ADDRESS_MEM_TYPE_32: - case PCI_BASE_ADDRESS_MEM_TYPE_64: - break; - - case PCI_BASE_ADDRESS_MEM_TYPE_1M: - printk("bios32 WARNING: slot %d, function %d " - "requests memory below 1MB---don't " - "know how to do that.\n", - PCI_SLOT(dev->devfn), - PCI_FUNC(dev->devfn)); - continue; - } - - /* - * Align to multiple of size of minimum base. - */ - - alignto = max_t(unsigned int, 0x1000, size); - base = ALIGN(mem_base, alignto); - mem_base = base + size; - pci_write_config_dword(dev, reg, base); - - dev->resource[i].start = base; - dev->resource[i].end = dev->resource[i].start + size - 1; - dev->resource[i].flags = IORESOURCE_MEM; - - if (type == PCI_BASE_ADDRESS_MEM_TYPE_64) - { - /* - * 64-bit address, set the highest 32 bits - * to zero. - */ - - reg += 4; - pci_write_config_dword(dev, reg, 0); - - i++; - dev->resource[i].start = 0; - dev->resource[i].end = 0; - dev->resource[i].flags = 0; - } - } - } - - /* - * Enable device: - */ - - if (dev->class >> 8 == PCI_CLASS_NOT_DEFINED || - dev->class >> 8 == PCI_CLASS_NOT_DEFINED_VGA || - dev->class >> 8 == PCI_CLASS_DISPLAY_VGA || - dev->class >> 8 == PCI_CLASS_DISPLAY_XGA) - { - /* - * All of these (may) have I/O scattered all around - * and may not use i/o-base address registers at all. - * So we just have to always enable I/O to these - * devices. - */ - cmd |= PCI_COMMAND_IO; - } - - pci_write_config_word(dev, PCI_COMMAND, cmd | PCI_COMMAND_MASTER); - - pci_write_config_byte(dev, PCI_LATENCY_TIMER, (disable_pci_burst) ? 0 : 32); - - if (bus_info != NULL) - bus_info->conf_device(dev); /* Machine dependent configuration. */ - - DBG_DEVS(("layout_dev: bus %d slot 0x%x VID 0x%x DID 0x%x class 0x%x\n", - dev->bus->number, PCI_SLOT(dev->devfn), dev->vendor, dev->device, dev->class)); -} - -/* - * static void layout_bus(struct pci_bus *bus) - * - * Layout memory and I/O for all devices on the given bus. - * - * Parameters: - * - * bus - bus. - */ - -static void __init layout_bus(struct pci_bus *bus) -{ - unsigned int bio, bmem; - struct pci_dev *dev; - - DBG_DEVS(("layout_bus: starting bus %d\n", bus->number)); - - if (!bus->devices && !bus->children) - return; - - /* - * Align the current bases on appropriate boundaries (4K for - * IO and 1MB for memory). - */ - - bio = io_base = ALIGN(io_base, 4*KB); - bmem = mem_base = ALIGN(mem_base, 1*MB); - - /* - * PCI devices might have been setup by a PCI BIOS emulation - * running under TOS. In these cases there is a - * window during which two devices may have an overlapping - * address range. To avoid this causing trouble, we first - * turn off the I/O and memory address decoders for all PCI - * devices. They'll be re-enabled only once all address - * decoders are programmed consistently. - */ - - DBG_DEVS(("layout_bus: disable_dev for bus %d\n", bus->number)); - - for (dev = bus->devices; dev; dev = dev->sibling) - { - if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) || - (dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA)) - disable_dev(dev); - } - - /* - * Allocate space to each device: - */ - - DBG_DEVS(("layout_bus: starting bus %d devices\n", bus->number)); - - for (dev = bus->devices; dev; dev = dev->sibling) - { - if ((dev->class >> 16 != PCI_BASE_CLASS_BRIDGE) || - (dev->class >> 8 == PCI_CLASS_BRIDGE_PCMCIA)) - layout_dev(dev); - } - - DBG_DEVS(("layout_bus: bus %d finished\n", bus->number)); -} - -/* - * static void pcibios_fixup(void) - * - * Layout memory and I/O of all devices on the PCI bus if 'pci_modify' is - * true. This might be necessary because not every m68k machine with a PCI - * bus has a PCI BIOS. This function should be called right after - * pci_scan_bus() in pcibios_init(). - */ - -static void __init pcibios_fixup(void) -{ - if (pci_modify) - { - /* - * Set base addresses for allocation of I/O and memory space. - */ - - io_base = bus_info->io_space.start + IO_ALLOC_OFFSET; - mem_base = bus_info->mem_space.start + MEM_ALLOC_OFFSET; - - /* - * Scan the tree, allocating PCI memory and I/O space. - */ - - layout_bus(pci_bus_b(pci_root.next)); - } - - /* - * Fix interrupt assignments, etc. - */ - - bus_info->fixup(pci_modify); -} - -/* - * static void pcibios_claim_resources(struct pci_bus *bus) - * - * Claim all resources that are assigned to devices on the given bus. - * - * Parameters: - * - * bus - bus. - */ - -static void __init pcibios_claim_resources(struct pci_bus *bus) -{ - struct pci_dev *dev; - int i; - - while (bus) - { - for (dev = bus->devices; (dev != NULL); dev = dev->sibling) - { - for (i = 0; i < PCI_NUM_RESOURCES; i++) - { - struct resource *r = &dev->resource[i]; - struct resource *pr; - struct pci_bus_info *bus_info = (struct pci_bus_info *) dev->sysdata; - - if ((r->start == 0) || (r->parent != NULL)) - continue; -#if 1 - if (r->flags & IORESOURCE_IO) - pr = &bus_info->io_space; - else - pr = &bus_info->mem_space; -#else - if (r->flags & IORESOURCE_IO) - pr = &ioport_resource; - else - pr = &iomem_resource; -#endif - if (request_resource(pr, r) < 0) - { - printk(KERN_ERR "PCI: Address space collision on region %d of device %s\n", i, dev->name); - } - } - } - - if (bus->children) - pcibios_claim_resources(bus->children); - - bus = bus->next; - } -} - -/* - * int pcibios_assign_resource(struct pci_dev *dev, int i) - * - * Assign a new address to a PCI resource. - * - * Parameters: - * - * dev - device. - * i - resource. - * - * Result: 0 if successful. - */ - -int __init pcibios_assign_resource(struct pci_dev *dev, int i) -{ - struct resource *r = &dev->resource[i]; - struct resource *pr = pci_find_parent_resource(dev, r); - unsigned long size = r->end + 1; - - if (!pr) - return -EINVAL; - - if (r->flags & IORESOURCE_IO) - { - if (size > 0x100) - return -EFBIG; - - if (allocate_resource(pr, r, size, bus_info->io_space.start + - IO_ALLOC_OFFSET, bus_info->io_space.end, 1024)) - return -EBUSY; - } - else - { - if (allocate_resource(pr, r, size, bus_info->mem_space.start + - MEM_ALLOC_OFFSET, bus_info->mem_space.end, size)) - return -EBUSY; - } - - if (i < 6) - pci_write_config_dword(dev, PCI_BASE_ADDRESS_0 + 4 * i, r->start); - - return 0; -} - -void __init pcibios_fixup_bus(struct pci_bus *bus) -{ - struct pci_dev *dev; - void *sysdata; - - sysdata = (bus->parent) ? bus->parent->sysdata : bus->sysdata; - - for (dev = bus->devices; (dev != NULL); dev = dev->sibling) - dev->sysdata = sysdata; -} - -void __init pcibios_init(void) -{ - printk("Linux/m68k PCI BIOS32 revision %x.%02x\n", MAJOR_REV, MINOR_REV); - - bus_info = NULL; -#ifdef CONFIG_HADES - if (MACH_IS_HADES) - bus_info = init_hades_pci(); -#endif - if (bus_info != NULL) - { - printk("PCI: Probing PCI hardware\n"); - pci_scan_bus(0, bus_info->m68k_pci_ops, bus_info); - pcibios_fixup(); - pcibios_claim_resources(pci_root); - } - else - printk("PCI: No PCI bus detected\n"); -} - -char * __init pcibios_setup(char *str) -{ - if (!strcmp(str, "nomodify")) - { - pci_modify = 0; - return NULL; - } - else if (!strcmp(str, "skipvga")) - { - skip_vga = 1; - return NULL; - } - else if (!strcmp(str, "noburst")) - { - disable_pci_burst = 1; - return NULL; - } - - return str; -} -#endif /* CONFIG_PCI */ |
