summaryrefslogtreecommitdiffstats
path: root/arch/m68k/kernel/bios32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/kernel/bios32.c')
-rw-r--r--arch/m68k/kernel/bios32.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/arch/m68k/kernel/bios32.c b/arch/m68k/kernel/bios32.c
new file mode 100644
index 00000000000..a901685eb6a
--- /dev/null
+++ b/arch/m68k/kernel/bios32.c
@@ -0,0 +1,515 @@
+/*
+ * 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/config.h>
+#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 */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-18 01:55:38 +0000