User:Combuster/Recovered USB Sheet

USB UHCI Enumeration

• Enumerate the UHCI Controller(s)
  • Class: 0x0C, Sub: 0x03, Intf: 0x00
• Store the I/O Base Address and Size
  • Determine Access Type
    • Address & (1<<0) ? IOMAP : MEMIO
  • Calculate I/O Address (MEMIO)
    • Address & 0xFFFFFFF0
  • Calculate I/O Address (IOMAP)
    • Address & 0xFFFFFFFC
  • Calculate Size of I/O
    • Address & 0xFFFFFFFF
• Store IRQ
  • 8 bit read to Base + 0x3C
• Enable Bus Master and IO Access
  • MEMIO Access
    • 16 bit write to Base + 0x04 of value 0x0006
  • IOMAP Access
    • 16 bit write to Base + 0x04 of value 0x0005
  • MEMIO & IOMAP Access
    • 16 bit write to Base + 0x04 of value 0x0007
• Disable Legacy Support
  • 16 bit write to Base + 0xC0 of value 0x8F00
  • 16 bit write to Base + 0xC0 of value 0x2000
• GRESET
  • 16 bit write to Base + 0x00 of value (1<<2)
  • Delay for 50 ms
  • 16 bit write to Base + 0x00 of value (~(1<<2))
  • Delay for 50 ms

Host Controller Configuration

• Allocate Physical Memory
• Initialize the Queue Chain
  • qh.h = 0x00000001
  • qh.v = 0x00000001
• Initialize the Frame List
  • frlist[0-1023] = QH.head | (1<<1)
• Set Basic Configurations
  • SOFMOD
    • 16 bit write to Base + 0x0C of value 0x40
  • FRBASEADD
    • 32 bit write to Base + 0x08 of value [physical address aligned to 4KB boundary]
  • FRNUM
    • 16 bit write to Base + 0x06 of value 0
  • USBINTR
    • 16 bit write to Base + 0x04 of value 0x000F
• Start the Host Controller
  • 16 bit write to Base + 0x00 of value (1<<0)

Detecting Device Attachment

• Test the CSC bit
  • 16 bit read to Base + [port #]
  • Value & (1<<1) ? TRUE : FALSE
• TRUE
  • Clear the CSC bit
    • 16 bit write to Base + [port #] of value (~(1<<1))
  • Test the CCS bit
    • 16 bit read to Base + [port #]
    • Value & (1<<0) ? TRUE : FALSE
  • TRUE
    • Device Attached
  • FALSE
    • Device Not Attached
• FALSE
  • Repeat

Basic Device Configuration

• In Progress...