• Sam Ravnborg's avatar
    sparc32: genirq support · 6baa9b20
    Sam Ravnborg authored
    
    
    The conversion of sparc32 to genirq is based on original work done
    by David S. Miller.
    Daniel Hellstrom has helped in the conversion and implemented
    the shutdowm functionality.
    Marcel van Nies <morcles@gmail.com> has tested this on Sparc Station 20
    
    Test status:
    sun4c      - not tested
    sun4m,pci  - not tested
    sun4m,sbus - tested (Sparc Classic, Sparc Station 5, Sparc Station 20)
    sun4d      - not tested
    leon       - tested on various combinations of leon boards,
                 including SMP variants
    
    generic
       Introduce use of GENERIC_HARDIRQS and GENERIC_IRQ_SHOW
       Allocate 64 IRQs - which is enough even for SS2000
       Use a table of irq_bucket to maintain uses IRQs
          irq_bucket is also used to chain several irq's that
          must be called when the same intrrupt is asserted
       Use irq_link to link a interrupt source to the irq
       All plafforms must now supply their own build_device_irq method
       handler_irq rewriten to use generic irq support
    
    floppy
       Read FLOPPY_IRQ from platform device
       Use generic request_irq to register the floppy interrupt
       Rewrote sparc_floppy_irq to use the generic irq support
    
    pcic:
       Introduce irq_chip
       Store mask in chip_data for use in mask/unmask functions
       Add build_device_irq for pcic
       Use pcic_build_device_irq in pci_time_init
       allocate virtual irqs in pcic_fill_irq
    
    sun4c:
       Introduce irq_chip
       Store mask in chip_data for use in mask/unmask functions
       Add build_device_irq for sun4c
       Use sun4c_build_device_irq in sun4c_init_timers
    
    sun4m:
       Introduce irq_chip
       Introduce dedicated mask/unmask methods
       Introduce sun4m_handler_data that allow easy access to necessary
         data in the mask/unmask functions
       Add a helper method to enable profile_timer (used from smp)
       Added sun4m_build_device_irq
       Use sun4m_build_device_irq in sun4m_init_timers
    
       TODO:
          There is no replacement for smp_rotate that always scheduled
          next CPU as interrupt target upon an interrupt
    
    sun4d:
       Introduce irq_chip
       Introduce dedicated mask/unmask methods
       Introduce sun4d_handler_data that allow easy access to
       necessary data in mask/unmask fuctions
       Rewrote sun4d_handler_irq to use generic irq support
    
       TODO:
          The original implmentation of enable/disable had:
    
              if (irq < NR_IRQS)
                   return;
    
          The new implmentation does not distingush between SBUS and cpu
          interrupts.
          I am no sure what is right here. I assume we need to do
          something for the cpu interrupts.
    
          I have not succeeded booting my sun4d box (with or without this patch)
          and my understanding of this platfrom is limited.
          So I would be a bit suprised if this works.
    
    leon:
       Introduce irq_chip
       Store mask in chip_data for use in mask/unmask functions
       Add build_device_irq for leon
       Use leon_build_device_irq in leon_init_timers
    Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
    Acked-by: default avatarDaniel Hellstrom <daniel@gaisler.com>
    Tested-by: default avatarDaniel Hellstrom <daniel@gaisler.com>
    Tested-by: default avatarMarcel van Nies <morcles@gmail.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    6baa9b20
leon_kernel.c 10.2 KB