diff options
Diffstat (limited to 'arch/mips/kernel/pci.c')
| -rw-r--r-- | arch/mips/kernel/pci.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/mips/kernel/pci.c b/arch/mips/kernel/pci.c new file mode 100644 index 000000000..e521ecdd9 --- /dev/null +++ b/arch/mips/kernel/pci.c @@ -0,0 +1,177 @@ +/* + * 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. + * + * MIPS implementation of PCI BIOS services for PCI support. + */ +#include <linux/bios32.h> +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/types.h> +#include <asm/pci.h> + +#ifndef CONFIG_PCI + +/* + * BIOS32 replacement. + */ +unsigned long pcibios_init(unsigned long memory_start, unsigned long memory_end) +{ + return memory_start; +} + +#else /* defined(CONFIG_PCI) */ + +/* + * Following the generic parts of the MIPS BIOS32 code. + */ + +int pcibios_present (void) +{ + return _pcibios_init != NULL; +} + +/* + * Given the vendor and device ids, find the n'th instance of that device + * in the system. + */ +int pcibios_find_device (unsigned short vendor, unsigned short device_id, + unsigned short index, unsigned char *bus, + unsigned char *devfn) +{ + unsigned int curr = 0; + struct pci_dev *dev; + + for (dev = pci_devices; dev; dev = dev->next) { + if (dev->vendor == vendor && dev->device == device_id) { + if (curr == index) { + *devfn = dev->devfn; + *bus = dev->bus->number; + return PCIBIOS_SUCCESSFUL; + } + ++curr; + } + } + return PCIBIOS_DEVICE_NOT_FOUND; +} + +/* + * Given the class, find the n'th instance of that device + * in the system. + */ +int pcibios_find_class (unsigned int class_code, unsigned short index, + unsigned char *bus, unsigned char *devfn) +{ + unsigned int curr = 0; + struct pci_dev *dev; + + for (dev = pci_devices; dev; dev = dev->next) { + if (dev->class == class_code) { + if (curr == index) { + *devfn = dev->devfn; + *bus = dev->bus->number; + return PCIBIOS_SUCCESSFUL; + } + ++curr; + } + } + return PCIBIOS_DEVICE_NOT_FOUND; +} + +const char *pcibios_strerror (int error) +{ + static char buf[80]; + + switch (error) { + case PCIBIOS_SUCCESSFUL: + return "SUCCESSFUL"; + + case PCIBIOS_FUNC_NOT_SUPPORTED: + return "FUNC_NOT_SUPPORTED"; + + case PCIBIOS_BAD_VENDOR_ID: + return "SUCCESSFUL"; + + case PCIBIOS_DEVICE_NOT_FOUND: + return "DEVICE_NOT_FOUND"; + + case PCIBIOS_BAD_REGISTER_NUMBER: + return "BAD_REGISTER_NUMBER"; + + default: + sprintf (buf, "UNKNOWN RETURN 0x%x", error); + return buf; + } +} + +/* + * The functions below are machine specific and must be reimplented for + * each PCI chipset configuration. We just run the hook to the machine + * specific implementation. + */ +unsigned long (*_pcibios_init)(unsigned long memory_start, unsigned long memory_end); +unsigned long pcibios_init(unsigned long memory_start, unsigned long memory_end) +{ + return _pcibios_init ? _pcibios_init(memory_start, memory_end) + : memory_start; +} + +unsigned long (*_pcibios_fixup) (unsigned long memory_start, + unsigned long memory_end); +unsigned long pcibios_fixup (unsigned long memory_start, + unsigned long memory_end) +{ + return _pcibios_fixup(memory_start, memory_end); +} + +int (*_pcibios_read_config_byte) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned char *val); +int pcibios_read_config_byte (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned char *val) +{ + return _pcibios_read_config_byte(bus, dev_fn, where, val); +} + +int (*_pcibios_read_config_word) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned short *val); +int pcibios_read_config_word (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned short *val) +{ + return _pcibios_read_config_word(bus, dev_fn, where, val); +} + +int (*_pcibios_read_config_dword) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned int *val); +int pcibios_read_config_dword (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned int *val) +{ + return _pcibios_read_config_dword(bus, dev_fn, where, val); +} + +int (*_pcibios_write_config_byte) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned char val); +int pcibios_write_config_byte (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned char val) +{ + return _pcibios_write_config_byte(bus, dev_fn, where, val); +} + +int (*_pcibios_write_config_word) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned short val); +int pcibios_write_config_word (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned short val) +{ + return _pcibios_write_config_word(bus, dev_fn, where, val); +} + +int (*_pcibios_write_config_dword) (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned int val); +int pcibios_write_config_dword (unsigned char bus, unsigned char dev_fn, + unsigned char where, unsigned int val) +{ + return _pcibios_write_config_dword(bus, dev_fn, where, val); +} + +#endif /* defined(CONFIG_PCI) */ |