pci.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:7k
- /*
- * 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.
- *
- * SNI specific PCI support for RM200/RM300.
- *
- * Copyright (C) 1997 - 2000 Ralf Baechle
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/pci.h>
- #include <linux/types.h>
- #include <asm/byteorder.h>
- #include <asm/pci_channel.h>
- #include <asm/hp-lj/asic.h>
- #ifdef CONFIG_PCI
- volatile u32* pci_config_address_reg = (volatile u32*)0xfdead000;
- volatile u32* pci_config_data_reg = (volatile u32*)0xfdead000;
- #define cfgaddr(dev, where) (((dev->bus->number & 0xff) << 0x10) |
- ((dev->devfn & 0xff) << 0x08) |
- (where & 0xfc))
- /*
- * We can't address 8 and 16 bit words directly. Instead we have to
- * read/write a 32bit word and mask/modify the data we actually want.
- */
- static int pcimt_read_config_byte (struct pci_dev *dev,
- int where, unsigned char *val)
- {
- *pci_config_address_reg = cfgaddr(dev, where);
- *val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xff;
- //printk("pci_read_byte 0x%x == 0x%xn", where, *val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pcimt_read_config_word (struct pci_dev *dev,
- int where, unsigned short *val)
- {
- if (where & 1)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- *pci_config_address_reg = cfgaddr(dev, where);
- *val = (le32_to_cpu(*pci_config_data_reg) >> ((where&3)<<3)) & 0xffff;
- //printk("pci_read_word 0x%x == 0x%xn", where, *val);
- return PCIBIOS_SUCCESSFUL;
- }
- int pcimt_read_config_dword (struct pci_dev *dev,
- int where, unsigned int *val)
- {
- if (where & 3)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- *pci_config_address_reg = cfgaddr(dev, where);
- *val = le32_to_cpu(*pci_config_data_reg);
- //printk("pci_read_dword 0x%x == 0x%xn", where, *val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pcimt_write_config_byte (struct pci_dev *dev,
- int where, unsigned char val)
- {
- *pci_config_address_reg = cfgaddr(dev, where);
- *(volatile u8 *)(((int)pci_config_data_reg) + (where & 3)) = val;
- //printk("pci_write_byte 0x%x = 0x%xn", where, val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int pcimt_write_config_word (struct pci_dev *dev,
- int where, unsigned short val)
- {
- if (where & 1)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- *pci_config_address_reg = cfgaddr(dev, where);
- *(volatile u16 *)(((int)pci_config_data_reg) + (where & 2)) =
- le16_to_cpu(val);
- //printk("pci_write_word 0x%x = 0x%xn", where, val);
- return PCIBIOS_SUCCESSFUL;
- }
- int pcimt_write_config_dword (struct pci_dev *dev,
- int where, unsigned int val)
- {
- if (where & 3)
- return PCIBIOS_BAD_REGISTER_NUMBER;
- *pci_config_address_reg = cfgaddr(dev, where);
- *pci_config_data_reg = le32_to_cpu(val);
- //printk("pci_write_dword 0x%x = 0x%xn", where, val);
- return PCIBIOS_SUCCESSFUL;
- }
- struct pci_ops hp_pci_ops = {
- pcimt_read_config_byte,
- pcimt_read_config_word,
- pcimt_read_config_dword,
- pcimt_write_config_byte,
- pcimt_write_config_word,
- pcimt_write_config_dword
- };
- struct pci_channel mips_pci_channels[] = {
- { &hp_pci_ops, &ioport_resource, &iomem_resource },
- { NULL, NULL, NULL }
- };
- unsigned __init int pcibios_assign_all_busses(void)
- {
- return 1;
- }
- void __init pcibios_fixup(void)
- {
- }
- void __init pcibios_fixup_irqs(void)
- {
- struct pci_dev *dev;
- int slot_num;
- pci_for_each_dev(dev) {
- slot_num = PCI_SLOT(dev->devfn);
- switch(slot_num) {
- case 2: dev->irq = 3; break;
- case 3: dev->irq = 4; break;
- case 4: dev->irq = 5; break;
- default: break;
- }
- }
- }
- #define IO_MEM_LOGICAL_START 0x3e000000
- #define IO_MEM_LOGICAL_END 0x3fefffff
- #define IO_PORT_LOGICAL_START 0x3ff00000
- #define IO_PORT_LOGICAL_END 0x3fffffff
- #define IO_MEM_VIRTUAL_OFFSET 0xb0000000
- #define IO_PORT_VIRTUAL_OFFSET 0xb0000000
- #define ONE_MEG (1024 * 1024)
- void __init pci_setup(void)
- {
- u32 pci_regs_base_offset = 0xfdead000;
- switch(GetAsicId()) {
- case AndrosAsic: pci_regs_base_offset = 0xbff80000; break;
- case HarmonyAsic: pci_regs_base_offset = 0xbff70000; break;
- default:
- printk("ERROR: PCI does not support %s Asicn", GetAsicName());
- while(1);
- break;
- }
- // set bus stat/command reg
- // REVIST this setting may need vary depending on the hardware
- *((volatile unsigned int*)(pci_regs_base_offset | 0x0004)) = 0x38000007;
- iomem_resource.start = IO_MEM_LOGICAL_START + IO_MEM_VIRTUAL_OFFSET;
- iomem_resource.end = IO_MEM_LOGICAL_END + IO_MEM_VIRTUAL_OFFSET;
- ioport_resource.start = IO_PORT_LOGICAL_START + IO_PORT_VIRTUAL_OFFSET;
- ioport_resource.end = IO_PORT_LOGICAL_END + IO_PORT_VIRTUAL_OFFSET;
- // KLUDGE (mips_io_port_base is screwed up, we've got to work around it here)
- // by letting both low (illegal) and high (legal) addresses appear in pci io space
- ioport_resource.start = 0x0;
- set_io_port_base(IO_PORT_LOGICAL_START + IO_PORT_VIRTUAL_OFFSET);
- // map the PCI address space
- // global map - all levels & processes can access
- // except that the range is outside user space
- // parameters: lo0, lo1, hi, pagemask
- // lo indicates physical page, hi indicates virtual address
- add_wired_entry((IO_MEM_LOGICAL_START >> 6) | 0x17,
- ((IO_MEM_LOGICAL_START + (16 * ONE_MEG)) >> 6) | 0x17,
- 0xee000000, PM_16M);
- // These are used in pci r/w routines so need to preceed bus scan
- pci_config_data_reg = (u32*) (((u32)mips_io_port_base) | 0xcfc);
- pci_config_address_reg = (u32*) (((u32)pci_regs_base_offset) | 0xcf8);
- }
- void __init pcibios_fixup_resources(struct pci_dev *dev)
- {
- int pos;
- int bases;
- printk("adjusting pci device: %sn", dev->name);
-
- switch (dev->hdr_type) {
- case PCI_HEADER_TYPE_NORMAL: bases = 6; break;
- case PCI_HEADER_TYPE_BRIDGE: bases = 2; break;
- case PCI_HEADER_TYPE_CARDBUS: bases = 1; break;
- default: bases = 0; break;
- }
- for (pos=0; pos < bases; pos++) {
- struct resource* res = &dev->resource[pos];
- if (res->start >= IO_MEM_LOGICAL_START &&
- res->end <= IO_MEM_LOGICAL_END) {
- res->start += IO_MEM_VIRTUAL_OFFSET;
- res->end += IO_MEM_VIRTUAL_OFFSET;
- }
- if (res->start >= IO_PORT_LOGICAL_START &&
- res->end <= IO_PORT_LOGICAL_END) {
- res->start += IO_PORT_VIRTUAL_OFFSET;
- res->end += IO_PORT_VIRTUAL_OFFSET;
- }
- }
- }
- #endif /* CONFIG_PCI */