pci.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:13k
- /*
- * Cobalt Qube/Raq PCI support
- *
- * 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.
- *
- * Copyright (C) 1995, 1996, 1997 by Ralf Baechle
- * Copyright (C) 2001 by Liam Davies (ldavies@agile.tv)
- *
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/pci.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <asm/cobalt/cobalt.h>
- #include <asm/pci.h>
- #include <asm/io.h>
- #ifdef CONFIG_PCI
- int cobalt_board_id;
- static void qube_expansion_slot_bist(struct pci_dev *dev)
- {
- unsigned char ctrl;
- int timeout = 100000;
- pci_read_config_byte(dev, PCI_BIST, &ctrl);
- if(!(ctrl & PCI_BIST_CAPABLE))
- return;
- pci_write_config_byte(dev, PCI_BIST, ctrl|PCI_BIST_START);
- do {
- pci_read_config_byte(dev, PCI_BIST, &ctrl);
- if(!(ctrl & PCI_BIST_START))
- break;
- } while(--timeout > 0);
- if((timeout <= 0) || (ctrl & PCI_BIST_CODE_MASK))
- printk("PCI: Expansion slot card failed BIST with code %xn",
- (ctrl & PCI_BIST_CODE_MASK));
- }
- static void qube_expansion_slot_fixup(struct pci_dev *dev)
- {
- unsigned short pci_cmd;
- unsigned long ioaddr_base = 0x10108000; /* It's magic, ask Doug. */
- unsigned long memaddr_base = 0x12000000;
- int i;
- /* Enable bits in COMMAND so driver can talk to it. */
- pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
- pci_cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
- pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
- /* Give it a working IRQ. */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, COBALT_QUBE_SLOT_IRQ);
- dev->irq = COBALT_QUBE_SLOT_IRQ;
- /* Fixup base addresses, we only support I/O at the moment. */
- for(i = 0; i <= 5; i++) {
- unsigned int regaddr = (PCI_BASE_ADDRESS_0 + (i * 4));
- unsigned int rval, mask, size, alignme, aspace;
- unsigned long *basep = &ioaddr_base;
- /* Check type first, punt if non-IO. */
- pci_read_config_dword(dev, regaddr, &rval);
- aspace = (rval & PCI_BASE_ADDRESS_SPACE);
- if(aspace != PCI_BASE_ADDRESS_SPACE_IO)
- basep = &memaddr_base;
- /* Figure out how much it wants, if anything. */
- pci_write_config_dword(dev, regaddr, 0xffffffff);
- pci_read_config_dword(dev, regaddr, &rval);
- /* Unused? */
- if(rval == 0)
- continue;
- rval &= PCI_BASE_ADDRESS_IO_MASK;
- mask = (~rval << 1) | 0x1;
- size = (mask & rval) & 0xffffffff;
- alignme = size;
- if(alignme < 0x400)
- alignme = 0x400;
- rval = ((*basep + (alignme - 1)) & ~(alignme - 1));
- *basep = (rval + size);
- pci_write_config_dword(dev, regaddr, rval | aspace);
- dev->resource[i].start = rval;
- dev->resource[i].end = *basep - 1;
- if(aspace == PCI_BASE_ADDRESS_SPACE_IO) {
- dev->resource[i].start -= 0x10000000;
- dev->resource[i].end -= 0x10000000;
- }
- }
- qube_expansion_slot_bist(dev);
- }
- static void qube_raq_via_bmIDE_fixup(struct pci_dev *dev)
- {
- unsigned short cfgword;
- unsigned char lt;
- /* Enable Bus Mastering and fast back to back. */
- pci_read_config_word(dev, PCI_COMMAND, &cfgword);
- cfgword |= (PCI_COMMAND_FAST_BACK | PCI_COMMAND_MASTER);
- pci_write_config_word(dev, PCI_COMMAND, cfgword);
- /* Enable both ide interfaces. ROM only enables primary one. */
- pci_write_config_byte(dev, 0x40, 0xb);
- /* Set latency timer to reasonable value. */
- pci_read_config_byte(dev, PCI_LATENCY_TIMER, <);
- if(lt < 64)
- pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
- pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 7);
- }
- static void qube_raq_tulip_fixup(struct pci_dev *dev)
- {
- unsigned short pci_cmd;
- /* Fixup the first tulip located at device PCICONF_ETH0 */
- if (PCI_SLOT(dev->devfn) == COBALT_PCICONF_ETH0) {
- /*
- * The IRQ of the first Tulip is different on Qube and RaQ
- */
- if (cobalt_board_id == COBALT_BRD_ID_RAQ2) {
- /* Setup the first Tulip on the RAQ */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
- COBALT_RAQ_ETH0_IRQ);
- dev->irq = COBALT_RAQ_ETH0_IRQ;
- } else {
- /* All Qube's route this the same way. */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
- COBALT_QUBE_ETH_IRQ);
- dev->irq = COBALT_QUBE_ETH_IRQ;
- }
- dev->resource[0].start = 0x100000;
- dev->resource[0].end = 0x10007f;
- if (dev->resource[1].start < 0x10000000) {
- dev->resource[1].start = 0xe9ffec00;
- dev->resource[1].end = 0xe9ffefff;
- pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0xe9ffec00);
- }
- /* Fixup the second tulip located at device PCICONF_ETH1 */
- } else if (PCI_SLOT(dev->devfn) == COBALT_PCICONF_ETH1) {
- /* Enable the second Tulip device. */
- pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
- pci_cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MASTER);
- pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
- /* Give it it's IRQ. */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
- COBALT_RAQ_ETH1_IRQ);
- dev->irq = COBALT_RAQ_ETH1_IRQ;
- /* And finally, a usable I/O space allocation, right after what
- * the first Tulip uses.
- */
- dev->resource[0].start = 0x101000;
- dev->resource[0].end = 0x10107f;
- }
- }
- static void qube_raq_scsi_fixup(struct pci_dev *dev)
- {
- unsigned short pci_cmd;
- /*
- * Tell the SCSI device that we expect an interrupt at
- * IRQ 7 and not the default 0.
- */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, COBALT_SCSI_IRQ);
- dev->irq = COBALT_SCSI_IRQ;
- if (cobalt_board_id == COBALT_BRD_ID_RAQ2) {
- /* Enable the device. */
- pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
- pci_cmd |= (PCI_COMMAND_IO | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY
- | PCI_COMMAND_INVALIDATE);
- pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
- /* Give it it's RAQ IRQ. */
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, COBALT_RAQ_SCSI_IRQ);
- dev->irq = COBALT_RAQ_SCSI_IRQ;
- /* And finally, a usable I/O space allocation, right after what
- * the second Tulip uses.
- */
- pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0x10102001);
- pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0x00002000);
- pci_write_config_dword(dev, PCI_BASE_ADDRESS_2, 0x00100000);
- }
- }
- static void qube_raq_galileo_fixup(struct pci_dev *dev)
- {
- unsigned short galileo_id;
- /* Fix PCI latency-timer and cache-line-size values in Galileo
- * host bridge.
- */
- pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
- pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 7);
- /* On all machines prior to Q2, we had the STOP line disconnected
- * from Galileo to VIA on PCI. The new Galileo does not function
- * correctly unless we have it connected.
- *
- * Therefore we must set the disconnect/retry cycle values to
- * something sensible when using the new Galileo.
- */
- pci_read_config_word(dev, PCI_REVISION_ID, &galileo_id);
- galileo_id &= 0xff; /* mask off class info */
- if (galileo_id == 0x10) {
- /* New Galileo, assumes PCI stop line to VIA is connected. */
- *((volatile unsigned int *)0xb4000c04) = 0x00004020;
- } else if (galileo_id == 0x1 || galileo_id == 0x2) {
- signed int timeo;
- /* XXX WE MUST DO THIS ELSE GALILEO LOCKS UP! -DaveM */
- timeo = *((volatile unsigned int *)0xb4000c04);
- /* Old Galileo, assumes PCI STOP line to VIA is disconnected. */
- *((volatile unsigned int *)0xb4000c04) = 0x0000ffff;
- }
- }
- static void
- qube_pcibios_fixup(struct pci_dev *dev)
- {
- if (PCI_SLOT(dev->devfn) == COBALT_PCICONF_PCISLOT) {
- unsigned int tmp;
- /* See if there is a device in the expansion slot, if so
- * discover its resources and fixup whatever we need to
- */
- pci_read_config_dword(dev, PCI_VENDOR_ID, &tmp);
- if(tmp != 0xffffffff && tmp != 0x00000000)
- qube_expansion_slot_fixup(dev);
- }
- }
- struct pci_fixup pcibios_fixups[] = {
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, qube_raq_via_bmIDE_fixup },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142, qube_raq_tulip_fixup },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_GALILEO, PCI_ANY_ID, qube_raq_galileo_fixup },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C860, qube_raq_scsi_fixup },
- { PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, qube_pcibios_fixup }
- };
- static __inline__ int pci_range_ck(struct pci_dev *dev)
- {
- if ((dev->bus->number == 0)
- && ((PCI_SLOT (dev->devfn) == 0)
- || ((PCI_SLOT (dev->devfn) > 6)
- && (PCI_SLOT (dev->devfn) <= 12))))
- return 0; /* OK device number */
- return -1; /* NOT ok device number */
- }
- #define PCI_CFG_DATA ((volatile unsigned long *)0xb4000cfc)
- #define PCI_CFG_CTRL ((volatile unsigned long *)0xb4000cf8)
- #define PCI_CFG_SET(dev,where)
- ((*PCI_CFG_CTRL) = (0x80000000 | (PCI_SLOT ((dev)->devfn) << 11) |
- (PCI_FUNC ((dev)->devfn) << 8) | (where)))
- static int qube_pci_read_config_dword (struct pci_dev *dev,
- int where,
- u32 *val)
- {
- if (where & 0x3)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- if (pci_range_ck (dev)) {
- *val = 0xFFFFFFFF;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- PCI_CFG_SET(dev, where);
- *val = *PCI_CFG_DATA;
- return PCIBIOS_SUCCESSFUL;
- }
- static int qube_pci_read_config_word (struct pci_dev *dev,
- int where,
- u16 *val)
- {
- if (where & 0x1)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- if (pci_range_ck (dev)) {
- *val = 0xffff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- PCI_CFG_SET(dev, (where & ~0x3));
- *val = *PCI_CFG_DATA >> ((where & 3) * 8);
- return PCIBIOS_SUCCESSFUL;
- }
- static int qube_pci_read_config_byte (struct pci_dev *dev,
- int where,
- u8 *val)
- {
- if (pci_range_ck (dev)) {
- *val = 0xff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
- PCI_CFG_SET(dev, (where & ~0x3));
- *val = *PCI_CFG_DATA >> ((where & 3) * 8);
- return PCIBIOS_SUCCESSFUL;
- }
- static int qube_pci_write_config_dword (struct pci_dev *dev,
- int where,
- u32 val)
- {
- if(where & 0x3)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- if (pci_range_ck (dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- PCI_CFG_SET(dev, where);
- *PCI_CFG_DATA = val;
- return PCIBIOS_SUCCESSFUL;
- }
- static int
- qube_pci_write_config_word (struct pci_dev *dev,
- int where,
- u16 val)
- {
- unsigned long tmp;
- if (where & 0x1)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- if (pci_range_ck (dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- PCI_CFG_SET(dev, (where & ~0x3));
- tmp = *PCI_CFG_DATA;
- tmp &= ~(0xffff << ((where & 0x3) * 8));
- tmp |= (val << ((where & 0x3) * 8));
- *PCI_CFG_DATA = tmp;
- return PCIBIOS_SUCCESSFUL;
- }
- static int
- qube_pci_write_config_byte (struct pci_dev *dev,
- int where,
- u8 val)
- {
- unsigned long tmp;
- if (pci_range_ck (dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- PCI_CFG_SET(dev, (where & ~0x3));
- tmp = *PCI_CFG_DATA;
- tmp &= ~(0xff << ((where & 0x3) * 8));
- tmp |= (val << ((where & 0x3) * 8));
- *PCI_CFG_DATA = tmp;
- return PCIBIOS_SUCCESSFUL;
- }
- struct pci_ops qube_pci_ops = {
- qube_pci_read_config_byte,
- qube_pci_read_config_word,
- qube_pci_read_config_dword,
- qube_pci_write_config_byte,
- qube_pci_write_config_word,
- qube_pci_write_config_dword
- };
- void __init pcibios_init(void)
- {
- struct pci_dev dev;
- printk("PCI: Probing PCI hardwaren");
- /* Read the cobalt id register out of the PCI config space */
- dev.devfn = PCI_DEVFN(COBALT_PCICONF_VIA, 0);
- PCI_CFG_SET(&dev, (VIA_COBALT_BRD_ID_REG & ~0x3));
- cobalt_board_id = *PCI_CFG_DATA >> ((VIA_COBALT_BRD_ID_REG & 3) * 8);
- cobalt_board_id = VIA_COBALT_BRD_REG_to_ID(cobalt_board_id);
- printk("Cobalt Board ID: %dn", cobalt_board_id);
- ioport_resource.start = 0x00000000;
- ioport_resource.end = 0x0fffffff;
- iomem_resource.start = 0x01000000;
- iomem_resource.end = 0xffffffff;
- pci_scan_bus(0, &qube_pci_ops, NULL);
- }
- char *pcibios_setup(char *str)
- {
- return str;
- }
- int pcibios_enable_device(struct pci_dev *dev)
- {
- u16 cmd, status;
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- pci_read_config_word(dev, PCI_STATUS, &status);
- printk("PCI: Enabling device %s (%04x %04x)n", dev->slot_name, cmd, status);
- /* We'll sort this out when we know it isn't enabled ;) */
- return 0;
- }
- void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size, unsigned long align)
- {
- panic("Uhhoh called pcibios_align_resourcen");
- }
- void pcibios_update_resource(struct pci_dev *dev, struct resource *root,
- struct resource *res, int resource)
- {
- panic("Uhhoh called pcibios_update_resourcen");
- }
- void __init pcibios_fixup_bus(struct pci_bus *bus)
- {
- /* We don't have sub-busses to fixup here */
- }
- unsigned int __init pcibios_assign_all_busses(void)
- {
- return 1;
- }
- #endif /* CONFIG_PCI */