chrp_pci.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:9k
- /*
- * BK Id: %F% %I% %G% %U% %#%
- */
- /*
- * CHRP pci routines.
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/delay.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #include <linux/ide.h>
- #include <linux/bootmem.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/irq.h>
- #include <asm/hydra.h>
- #include <asm/prom.h>
- #include <asm/gg2.h>
- #include <asm/machdep.h>
- #include <asm/sections.h>
- #include <asm/pci-bridge.h>
- #include <asm/open_pic.h>
- /* LongTrail */
- unsigned long gg2_pci_config_base;
- #define pci_config_addr(dev, offset)
- (gg2_pci_config_base | ((dev->bus->number)<<16) | ((dev->devfn)<<8) | (offset))
- volatile struct Hydra *Hydra = NULL;
- /*
- * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
- * limit the bus number to 3 bits
- */
- #define cfg_read(val, addr, type, op) *val = op((type)(addr))
- #define cfg_write(val, addr, type, op) op((type *)(addr), (val))
- #define cfg_read_bad(val, size) *val = bad_##size;
- #define cfg_write_bad(val, size)
- #define bad_byte 0xff
- #define bad_word 0xffff
- #define bad_dword 0xffffffffU
- #define GG2_PCI_OP(rw, size, type, op)
- int __chrp gg2_##rw##_config_##size(struct pci_dev *dev, int off, type val)
- {
- if (dev->bus->number > 7) {
- cfg_##rw##_bad(val, size)
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- cfg_##rw(val, pci_config_addr(dev, off), type, op);
- return PCIBIOS_SUCCESSFUL;
- }
- GG2_PCI_OP(read, byte, u8 *, in_8)
- GG2_PCI_OP(read, word, u16 *, in_le16)
- GG2_PCI_OP(read, dword, u32 *, in_le32)
- GG2_PCI_OP(write, byte, u8, out_8)
- GG2_PCI_OP(write, word, u16, out_le16)
- GG2_PCI_OP(write, dword, u32, out_le32)
- static struct pci_ops gg2_pci_ops =
- {
- gg2_read_config_byte,
- gg2_read_config_word,
- gg2_read_config_dword,
- gg2_write_config_byte,
- gg2_write_config_word,
- gg2_write_config_dword
- };
- /*
- * Access functions for PCI config space on IBM "python" host bridges.
- */
- #define PYTHON_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16)
- | (((o) & ~3) << 24))
- #define PYTHON_PCI_OP(rw, size, type, op, mask)
- int __chrp
- python_##rw##_config_##size(struct pci_dev *dev, int offset, type val)
- {
- struct pci_controller *hose = dev->sysdata;
-
- out_be32(hose->cfg_addr,
- PYTHON_CFA(dev->bus->number, dev->devfn, offset));
- cfg_##rw(val, hose->cfg_data + (offset & mask), type, op);
- return PCIBIOS_SUCCESSFUL;
- }
- PYTHON_PCI_OP(read, byte, u8 *, in_8, 3)
- PYTHON_PCI_OP(read, word, u16 *, in_le16, 2)
- PYTHON_PCI_OP(read, dword, u32 *, in_le32, 0)
- PYTHON_PCI_OP(write, byte, u8, out_8, 3)
- PYTHON_PCI_OP(write, word, u16, out_le16, 2)
- PYTHON_PCI_OP(write, dword, u32, out_le32, 0)
- static struct pci_ops python_pci_ops =
- {
- python_read_config_byte,
- python_read_config_word,
- python_read_config_dword,
- python_write_config_byte,
- python_write_config_word,
- python_write_config_dword
- };
- /*
- * Access functions for PCI config space using RTAS calls.
- */
- #define RTAS_PCI_READ_OP(size, type, nbytes)
- int __chrp
- rtas_read_config_##size(struct pci_dev *dev, int offset, type val)
- {
- unsigned long addr = (offset & 0xff) | ((dev->devfn & 0xff) << 8)
- | ((dev->bus->number & 0xff) << 16);
- unsigned long ret = ~0UL;
- int rval;
-
- rval = call_rtas("read-pci-config", 2, 2, &ret, addr, nbytes);
- *val = ret;
- return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
- }
- #define RTAS_PCI_WRITE_OP(size, type, nbytes)
- int __chrp
- rtas_write_config_##size(struct pci_dev *dev, int offset, type val)
- {
- unsigned long addr = (offset & 0xff) | ((dev->devfn & 0xff) << 8)
- | ((dev->bus->number & 0xff) << 16);
- int rval;
-
- rval = call_rtas("write-pci-config", 3, 1, NULL,
- addr, nbytes, (ulong)val);
- return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
- }
- RTAS_PCI_READ_OP(byte, u8 *, 1)
- RTAS_PCI_READ_OP(word, u16 *, 2)
- RTAS_PCI_READ_OP(dword, u32 *, 4)
- RTAS_PCI_WRITE_OP(byte, u8, 1)
- RTAS_PCI_WRITE_OP(word, u16, 2)
- RTAS_PCI_WRITE_OP(dword, u32, 4)
- static struct pci_ops rtas_pci_ops =
- {
- rtas_read_config_byte,
- rtas_read_config_word,
- rtas_read_config_dword,
- rtas_write_config_byte,
- rtas_write_config_word,
- rtas_write_config_dword
- };
- int __init
- hydra_init(void)
- {
- struct device_node *np;
- np = find_devices("mac-io");
- if (np == NULL || np->n_addrs == 0)
- return 0;
- Hydra = ioremap(np->addrs[0].address, np->addrs[0].size);
- printk("Hydra Mac I/O at %xn", np->addrs[0].address);
- out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
- HYDRA_FC_SCSI_CELL_EN |
- HYDRA_FC_SCCA_ENABLE |
- HYDRA_FC_SCCB_ENABLE |
- HYDRA_FC_ARB_BYPASS |
- HYDRA_FC_MPIC_ENABLE |
- HYDRA_FC_SLOW_SCC_PCLK |
- HYDRA_FC_MPIC_IS_MASTER));
- return 1;
- }
- void __init
- chrp_pcibios_fixup(void)
- {
- struct pci_dev *dev;
- struct device_node *np;
- /* PCI interrupts are controlled by the OpenPIC */
- pci_for_each_dev(dev) {
- np = pci_device_to_OF_node(dev);
- if ((np != 0) && (np->n_intrs > 0) && (np->intrs[0].line != 0))
- dev->irq = np->intrs[0].line;
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
- }
- }
- #define PRG_CL_RESET_VALID 0x00010000
- static void __init
- setup_python(struct pci_controller *hose, struct device_node *dev)
- {
- u32 *reg, val;
- volatile unsigned char *cfg;
- hose->ops = &python_pci_ops;
- cfg = ioremap(dev->addrs[0].address + 0xf8000, 0x20);
- hose->cfg_addr = (volatile unsigned int *) cfg;
- hose->cfg_data = cfg + 0x10;
- /* Clear the magic go-slow bit */
- reg = (u32 *) ioremap(dev->addrs[0].address + 0xf6000, 0x40);
- val = in_be32(®[12]);
- if (val & PRG_CL_RESET_VALID) {
- out_be32(®[12], val & ~PRG_CL_RESET_VALID);
- in_be32(®[12]);
- }
- iounmap(reg);
- }
- void __init
- chrp_find_bridges(void)
- {
- struct device_node *dev;
- int *bus_range;
- int len, index = -1;
- struct pci_controller *hose;
- unsigned int *dma;
- char *model, *machine;
- int is_longtrail = 0, is_mot = 0;
- struct device_node *root = find_path_device("/");
- /*
- * The PCI host bridge nodes on some machines don't have
- * properties to adequately identify them, so we have to
- * look at what sort of machine this is as well.
- */
- machine = get_property(root, "model", NULL);
- if (machine != NULL) {
- is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
- is_mot = strncmp(machine, "MOT", 3) == 0;
- }
- for (dev = root->child; dev != NULL; dev = dev->sibling) {
- if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
- continue;
- ++index;
- /* The GG2 bridge on the LongTrail doesn't have an address */
- if (dev->n_addrs < 1 && !is_longtrail) {
- printk(KERN_WARNING "Can't use %s: no addressn",
- dev->full_name);
- continue;
- }
- bus_range = (int *) get_property(dev, "bus-range", &len);
- if (bus_range == NULL || len < 2 * sizeof(int)) {
- printk(KERN_WARNING "Can't get bus-range for %sn",
- dev->full_name);
- continue;
- }
- if (bus_range[1] == bus_range[0])
- printk(KERN_INFO "PCI bus %d", bus_range[0]);
- else
- printk(KERN_INFO "PCI buses %d..%d",
- bus_range[0], bus_range[1]);
- printk(" controlled by %s", dev->type);
- if (dev->n_addrs > 0)
- printk(" at %x", dev->addrs[0].address);
- printk("n");
- hose = pcibios_alloc_controller();
- if (!hose) {
- printk("Can't allocate PCI controller structure for %sn",
- dev->full_name);
- continue;
- }
- hose->arch_data = dev;
- hose->first_busno = bus_range[0];
- hose->last_busno = bus_range[1];
- model = get_property(dev, "model", NULL);
- if (model == NULL)
- model = "<none>";
- if (device_is_compatible(dev, "IBM,python")) {
- setup_python(hose, dev);
- } else if (is_mot
- || strncmp(model, "Motorola, Grackle", 17) == 0) {
- setup_grackle(hose);
- } else if (is_longtrail) {
- hose->ops = &gg2_pci_ops;
- gg2_pci_config_base = (unsigned long)
- ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
- } else if (!strncmp(model, "IBM,CPC710", 10)) {
- setup_indirect_pci(hose,
- dev->addrs[0].address + 0x000f8000,
- dev->addrs[0].address + 0x000f8010);
- if (index == 0) {
- dma = (unsigned int *)
- get_property(dev, "system-dma-base", &len);
- if (dma && len >= sizeof(*dma)) {
- dma = (unsigned int *)(((unsigned long)dma) +
- len - sizeof(*dma));
- pci_dram_offset = *dma;
- }
- }
- } else {
- printk("No methods for %s (model %s), using RTASn",
- dev->full_name, model);
- hose->ops = &rtas_pci_ops;
- }
- pci_process_bridge_OF_ranges(hose, dev, index == 0);
- /* check the first bridge for a property that we can
- use to set pci_dram_offset */
- dma = (unsigned int *)
- get_property(dev, "ibm,dma-ranges", &len);
- if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
- pci_dram_offset = dma[2] - dma[3];
- printk("pci_dram_offset = %lxn", pci_dram_offset);
- }
- }
- ppc_md.pcibios_fixup = chrp_pcibios_fixup;
- }