core_polaris.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:6k
- /*
- * linux/arch/alpha/kernel/core_polaris.c
- *
- * POLARIS chip-specific code
- */
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/pci.h>
- #include <linux/sched.h>
- #include <linux/init.h>
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #define __EXTERN_INLINE inline
- #include <asm/io.h>
- #include <asm/core_polaris.h>
- #undef __EXTERN_INLINE
- #include "proto.h"
- #include "pci_impl.h"
- /*
- * BIOS32-style PCI interface:
- */
- #define DEBUG_CONFIG 0
- #if DEBUG_CONFIG
- # define DBG_CFG(args) printk args
- #else
- # define DBG_CFG(args)
- #endif
- /*
- * Given a bus, device, and function number, compute resulting
- * configuration space address. This is fairly straightforward
- * on POLARIS, since the chip itself generates Type 0 or Type 1
- * cycles automatically depending on the bus number (Bus 0 is
- * hardwired to Type 0, all others are Type 1. Peer bridges
- * are not supported).
- *
- * All types:
- *
- * 3 3 3 3|3 3 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1
- * 9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |1|1|1|1|1|0|0|1|1|1|1|1|1|1|1|0|B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|x|x|
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *
- * 23:16 bus number (8 bits = 128 possible buses)
- * 15:11 Device number (5 bits)
- * 10:8 function number
- * 7:2 register number
- *
- * Notes:
- * The function number selects which function of a multi-function device
- * (e.g., scsi and ethernet).
- *
- * The register selects a DWORD (32 bit) register offset. Hence it
- * doesn't get shifted by 2 bits as we want to "drop" the bottom two
- * bits.
- */
- static int
- mk_conf_addr(struct pci_dev *dev, int where, unsigned long *pci_addr, u8 *type1)
- {
- u8 bus = dev->bus->number;
- u8 device_fn = dev->devfn;
- *type1 = (bus == 0) ? 0 : 1;
- *pci_addr = (bus << 16) | (device_fn << 8) | (where) |
- POLARIS_DENSE_CONFIG_BASE;
- DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x,"
- " returning address 0x%pn"
- bus, device_fn, where, *pci_addr));
- return 0;
- }
- static int
- polaris_read_config_byte(struct pci_dev *dev, int where, u8 *value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- *value = __kernel_ldbu(*(vucp)pci_addr);
- return PCIBIOS_SUCCESSFUL;
- }
- static int
- polaris_read_config_word(struct pci_dev *dev, int where, u16 *value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- *value = __kernel_ldwu(*(vusp)pci_addr);
- return PCIBIOS_SUCCESSFUL;
- }
- int
- polaris_read_config_dword(struct pci_dev *dev, int where, u32 *value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- *value = *(vuip)pci_addr;
- return PCIBIOS_SUCCESSFUL;
- }
- static int
- polaris_write_config_byte(struct pci_dev *dev, int where, u8 value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- __kernel_stb(value, *(vucp)pci_addr);
- mb();
- __kernel_ldbu(*(vucp)pci_addr);
- return PCIBIOS_SUCCESSFUL;
- }
- static int
- polaris_write_config_word(struct pci_dev *dev, int where, u16 value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- __kernel_stw(value, *(vusp)pci_addr);
- mb();
- __kernel_ldwu(*(vusp)pci_addr);
- return PCIBIOS_SUCCESSFUL;
- }
- int
- polaris_write_config_dword(struct pci_dev *dev, int where, u32 value)
- {
- unsigned long pci_addr;
- unsigned char type1;
- if (mk_conf_addr(dev, where, &pci_addr, &type1))
- return PCIBIOS_DEVICE_NOT_FOUND;
- *(vuip)pci_addr = value;
- mb();
- *(vuip)pci_addr;
- return PCIBIOS_SUCCESSFUL;
- }
- struct pci_ops polaris_pci_ops =
- {
- read_byte: polaris_read_config_byte,
- read_word: polaris_read_config_word,
- read_dword: polaris_read_config_dword,
- write_byte: polaris_write_config_byte,
- write_word: polaris_write_config_word,
- write_dword: polaris_write_config_dword
- };
- void __init
- polaris_init_arch(void)
- {
- struct pci_controller *hose;
- /* May need to initialize error reporting (see PCICTL0/1), but
- * for now assume that the firmware has done the right thing
- * already.
- */
- #if 0
- printk("polaris_init_arch(): trusting firmware for setupn");
- #endif
- /*
- * Create our single hose.
- */
- pci_isa_hose = hose = alloc_pci_controller();
- hose->io_space = &ioport_resource;
- hose->mem_space = &iomem_resource;
- hose->index = 0;
- hose->sparse_mem_base = 0;
- hose->dense_mem_base = POLARIS_DENSE_MEM_BASE - IDENT_ADDR;
- hose->sparse_io_base = 0;
- hose->dense_io_base = POLARIS_DENSE_IO_BASE - IDENT_ADDR;
- hose->sg_isa = hose->sg_pci = NULL;
- /* The I/O window is fixed at 2G @ 2G. */
- __direct_map_base = 0x80000000;
- __direct_map_size = 0x80000000;
- }
- static inline void
- polaris_pci_clr_err(void)
- {
- *(vusp)POLARIS_W_STATUS;
- /* Write 1's to settable bits to clear errors */
- *(vusp)POLARIS_W_STATUS = 0x7800;
- mb();
- *(vusp)POLARIS_W_STATUS;
- }
- void
- polaris_machine_check(unsigned long vector, unsigned long la_ptr,
- struct pt_regs * regs)
- {
- /* Clear the error before any reporting. */
- mb();
- mb();
- draina();
- polaris_pci_clr_err();
- wrmces(0x7);
- mb();
- process_mcheck_info(vector, la_ptr, regs, "POLARIS",
- mcheck_expected(0));
- }