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PCI Drivers

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PCI Drivers

  1. 1. © 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Peripheral Component Interconnect (PCI) Drivers
  2. 2. 2© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. What to Expect? PCI Subsystem Coding Details of a PCI Device Driver Browsing Sample Code
  3. 3. 3© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. PCI Prologue Developed by Intel as a replacement for ISA More of a processor (specific) bus for x86 architectures Replacing Features Plug n Play Platform independent Fast Hardware Addressing Through South Bridge (PCI Controller) Buses (upto 256) → Devices (upto 32) → Functions (upto 8)
  4. 4. 4© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Kernel Aspect Organized as PCI Core (driver of the PCI Controller) PCI Drivers (device drivers) Kernel Windows for PCI /proc/bus/pci/devices (Try cat) /sys/bus/pci/devices (Try tree) Command: lspci
  5. 5. 5© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Dynamic Device Configuration What Configuration? Device Base Address(es) Register Space(s) Memory(s) Interrupt Vectors ... Done during Bootup by BIOS, Or PCI Core (Bootloader or Kernel) Configured by the time, driver comes up But, where is this configuration stored?
  6. 6. 6© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. PCI Device Configuration Space Vendor ID BIST Header Type Lat Timer Cache Line Class Code Rev ID Status Register Command Register Device ID 0x0 0xF Base Address 0 CardBus CIS pointerBase Address 5Base Address 4 Base Address 3Base Address 2Base Address 1 Subsystem Vendor ID Subsystem Device ID Expansion ROM Base Address IRQ Line IRQ Pin Min Gnt Max Lat 0x00 0x30 0x20 0x10 Reserved
  7. 7. 7© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. PCI Device Config Space Access Header: <linux/pci.h> APIs int pci_read_config_byte(struct pci_dev *dev, int where, u8 *val); int pci_read_config_word(struct pci_dev *dev, int where, u16 *val); int pci_read_config_dword(struct pci_dev *dev, int where, u32 *val); int pci_write_config_byte(struct pci_dev *dev, int where, u8 *val); int pci_write_config_word(struct pci_dev *dev, int where, u16 *val); int pci_write_config_dword(struct pci_dev *dev, int where, u32 *val); NB struct pci_dev *dev would be available as parameter to probe()
  8. 8. 8© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Standard PCI Device Access API Upto 6 Memory or I/O regions Header: <linux/pci.h> APIs unsigned long pci_resource_start(dev, bar); unsigned long pci_resource_len(dev, bar); unsigned long pci_resource_flags(dev, bar); Flags IORESOURCE_IO IORESOURCE_MEM IORESOURCE_PREFETCH
  9. 9. 9© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. PCI Driver Registration int pci_register_driver(struct pci_driver *drv); int pci_unregister_driver(struct pci_driver *drv); struct pci_driver const char *name const struct pci_dev_id *id_table; PCI_DEVICE(vendor, device); PCI_DEVICE_CLASS(dev_class, dev_class_mask); int (*probe)(pci_dev, id_table); void (*remove)(pci_dev); Header: <linux/pci.h>
  10. 10. 10© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Typical 'probe' Function int probe(struct pci_dev *dev, struct pci_dev_id *id) { /* Enable the PCI Device */ pci_enable_device(dev); ... /* Acquire PCI Device's regions */ pci_request_regions(dev, “label”); ... /* Possibly map I/Os */ ... pci_set_drvdata(dev, <pvt_data_ptr>); // Optional ... /* Register the vertical */ ... return 0; /* Claimed. Negative for not Claimed */ }
  11. 11. 11© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Typical 'remove' Function void remove(struct pci_dev *dev) { /* Unregister the vertical */ ... pci_set_drvdata(dev, NULL); // Optional ... /* Possibly unmap I/Os */ ... /* Release PCI Device's regions */ pci_release_regions(dev); ... /* Disable the PCI Device */ pci_disable_device(dev); }
  12. 12. 12© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Old-style PCI Probing & Getting struct pci_dev *pci_find_*(vendor, device, from); struct pci_dev *pci_get_device(v, d, from); struct pci_dev *pci_get_subsys(v, d, ssv, ssd, f); struct pci_dev *pci_get_slot(bus, devfn); pci_dev_put(pci_dev);
  13. 13. © 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. DMA Mapping APIs dma_addr_t pci_map_single(struct pci_dev *, void *, size_t, int dir); void pci_unmap_single(struct pci_dev *, dma_addr_t, size_t, int dir); Directions PCI_DMA_BIDIRECTIONAL PCI_DMA_TODEVICE PCI_DMA_FROMDEVICE Header: <linux/pci.h> To Device PM VM PA VA From Device
  14. 14. © 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. DMA Allocation PM VM APIs void *pci_alloc_consistent(struct pci_dev *, size_t, dma_addr_t *); void pci_free_consistent(struct pci_dev *, size_t, void *, dma_addr_t); int pci_set_dma_mask(struct pci_dev *, u64 mask); Header: <linux/pci.h> PA VA
  15. 15. 15© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. What all have we learnt? PCI Subsystem Coding Details of a PCI Device Driver Browsing Sample Code DMA with PCI
  16. 16. 16© 2010-17 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Any Queries?

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