source: rtems/c/src/lib/libbsp/powerpc/shared/irq/irq.h @ df49c60

/* irq.h
 *
 *  This include file describe the data structure and the functions implemented
 *  by rtems to write interrupt handlers.
 *
 *  CopyRight (C) 1999 valette@crf.canon.fr
 *
 *  This code is heavilly inspired by the public specification of STREAM V2
 *  that can be found at :
 *
 *      <http://www.chorus.com/Documentation/index.html> by following
 *  the STREAM API Specification Document link.
 *
 *  The license and distribution terms for this file may be
 *  found in found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id$
 */

#ifndef LIBBSP_POWERPC_MCP750_IRQ_IRQ_H
#define LIBBSP_POWERPC_MCP750_IRQ_IRQ_H


/*
 * 8259 edge/level control definitions at VIA
 */
#define ISA8259_M_ELCR          0x4d0
#define ISA8259_S_ELCR          0x4d1

#define ELCRS_INT15_LVL         0x80
#define ELCRS_INT14_LVL         0x40
#define ELCRS_INT13_LVL         0x20
#define ELCRS_INT12_LVL         0x10
#define ELCRS_INT11_LVL         0x08
#define ELCRS_INT10_LVL         0x04
#define ELCRS_INT9_LVL          0x02
#define ELCRS_INT8_LVL          0x01
#define ELCRM_INT7_LVL          0x80
#define ELCRM_INT6_LVL          0x40
#define ELCRM_INT5_LVL          0x20
#define ELCRM_INT4_LVL          0x10
#define ELCRM_INT3_LVL          0x8
#define ELCRM_INT2_LVL          0x4
#define ELCRM_INT1_LVL          0x2
#define ELCRM_INT0_LVL          0x1

#define BSP_ASM_IRQ_VECTOR_BASE 0x0
    /* PIC's command and mask registers */
#define PIC_MASTER_COMMAND_IO_PORT              0x20    /* Master PIC command register */
#define PIC_SLAVE_COMMAND_IO_PORT               0xa0    /* Slave PIC command register */
#define PIC_MASTER_IMR_IO_PORT                  0x21    /* Master PIC Interrupt Mask Register */
#define PIC_SLAVE_IMR_IO_PORT                   0xa1    /* Slave PIC Interrupt Mask Register */

    /* Command for specific EOI (End Of Interrupt): Interrupt acknowledge */
#define PIC_EOSI        0x60    /* End of Specific Interrupt (EOSI) */
#define SLAVE_PIC_EOSI  0x62    /* End of Specific Interrupt (EOSI) for cascade */
#define PIC_EOI         0x20    /* Generic End of Interrupt (EOI) */

#ifndef ASM


/*
 * Symblolic IRQ names and related definitions.
 */

typedef enum {
  /* Base vector for our ISA IRQ handlers. */
  BSP_ISA_IRQ_VECTOR_BASE       =       BSP_ASM_IRQ_VECTOR_BASE,
  /*
   * ISA IRQ handler related definitions
   */
  BSP_ISA_IRQ_NUMBER            =       16,
  BSP_ISA_IRQ_LOWEST_OFFSET     =       0,
  BSP_ISA_IRQ_MAX_OFFSET        =       BSP_ISA_IRQ_LOWEST_OFFSET + BSP_ISA_IRQ_NUMBER - 1,
  /*
   * PCI IRQ handlers related definitions
   * CAUTION : BSP_PCI_IRQ_LOWEST_OFFSET should be equal to OPENPIC_VEC_SOURCE
   */
  BSP_PCI_IRQ_NUMBER            =       16,
  BSP_PCI_IRQ_LOWEST_OFFSET     =       BSP_ISA_IRQ_NUMBER,
  BSP_PCI_IRQ_MAX_OFFSET        =       BSP_PCI_IRQ_LOWEST_OFFSET + BSP_PCI_IRQ_NUMBER - 1,
  /*
   * PowerPc exceptions handled as interrupt where a rtems managed interrupt
   * handler might be connected
   */
  BSP_PROCESSOR_IRQ_NUMBER      =       1,
  BSP_PROCESSOR_IRQ_LOWEST_OFFSET =     BSP_PCI_IRQ_MAX_OFFSET + 1,
  BSP_PROCESSOR_IRQ_MAX_OFFSET  =       BSP_PROCESSOR_IRQ_LOWEST_OFFSET + BSP_PROCESSOR_IRQ_NUMBER - 1,
  /*
   * Summary
   */
  BSP_IRQ_NUMBER                =       BSP_PROCESSOR_IRQ_MAX_OFFSET + 1,
  BSP_LOWEST_OFFSET             =       BSP_ISA_IRQ_LOWEST_OFFSET,
  BSP_MAX_OFFSET                =       BSP_PROCESSOR_IRQ_MAX_OFFSET,
    /*
     * Some ISA IRQ symbolic name definition
     */        
  BSP_ISA_PERIODIC_TIMER        =       0,

  BSP_ISA_KEYBOARD              =       1,

  BSP_ISA_UART_COM2_IRQ         =       3,

  BSP_ISA_UART_COM1_IRQ         =       4,

  BSP_ISA_RT_TIMER1             =       8,
  
  BSP_ISA_RT_TIMER3             =       10,
    /*
     * Some PCI IRQ symbolic name definition
     */
  BSP_PCI_IRQ0                  =       BSP_PCI_IRQ_LOWEST_OFFSET,
  BSP_PCI_ISA_BRIDGE_IRQ        =       BSP_PCI_IRQ0,
    /*
     * Some Processor execption handled as rtems IRQ symbolic name definition
     */
  BSP_DECREMENTER               =       BSP_PROCESSOR_IRQ_LOWEST_OFFSET
  
}rtems_irq_symbolic_name;

    


/*
 * Type definition for RTEMS managed interrupts
 */
typedef unsigned char  rtems_irq_prio;
typedef unsigned short rtems_i8259_masks;

extern  volatile rtems_i8259_masks i8259s_cache;

struct  __rtems_irq_connect_data__;     /* forward declaratiuon */

typedef void (*rtems_irq_hdl)           (void);
typedef void (*rtems_irq_enable)        (const struct __rtems_irq_connect_data__*);
typedef void (*rtems_irq_disable)       (const struct __rtems_irq_connect_data__*);
typedef int  (*rtems_irq_is_enabled)    (const struct __rtems_irq_connect_data__*);

typedef struct __rtems_irq_connect_data__ {
  /*
   * IRQ line
   */
  rtems_irq_symbolic_name       name;
  /*
   * handler. See comment on handler properties below in function prototype.
   */
  rtems_irq_hdl                 hdl;
  /*
   * function for enabling interrupts at device level (ONLY!).
   * The BSP code will automatically enable it at i8259s level and openpic level.
   * RATIONALE : anyway such code has to exist in current driver code.
   * It is usually called immediately AFTER connecting the interrupt handler.
   * RTEMS may well need such a function when restoring normal interrupt
   * processing after a debug session.
   * 
   */
    rtems_irq_enable            on;     
  /*
   * function for disabling interrupts at device level (ONLY!).
   * The code will disable it at i8259s level. RATIONALE : anyway
   * such code has to exist for clean shutdown. It is usually called
   * BEFORE disconnecting the interrupt. RTEMS may well need such
   * a function when disabling normal interrupt processing for
   * a debug session. May well be a NOP function.
   */
  rtems_irq_disable             off;
  /*
   * function enabling to know what interrupt may currently occur
   * if someone manipulates the i8259s interrupt mask without care...
   */
    rtems_irq_is_enabled        isOn;
}rtems_irq_connect_data;

typedef struct {
  /*
   * size of all the table fields (*Tbl) described below.
   */
  unsigned int                  irqNb;
  /*
   * Default handler used when disconnecting interrupts.
   */
  rtems_irq_connect_data        defaultEntry;
  /*
   * Table containing initials/current value.
   */
  rtems_irq_connect_data*       irqHdlTbl;
  /*
   * actual value of BSP_ISA_IRQ_VECTOR_BASE...
   */
  rtems_irq_symbolic_name       irqBase;
  /*
   * software priorities associated with interrupts.
   * if irqPrio  [i]  >  intrPrio  [j]  it  means  that  
   * interrupt handler hdl connected for interrupt name i
   * will  not be interrupted by the handler connected for interrupt j
   * The interrupt source  will be physically masked at i8259 level.
   */
    rtems_irq_prio*             irqPrioTbl;
}rtems_irq_global_settings;




/*-------------------------------------------------------------------------+
| Function Prototypes.
+--------------------------------------------------------------------------*/
/*
 * ------------------------ Intel 8259 (or emulation) Mngt Routines -------
 */

/*
 * function to disable a particular irq at 8259 level. After calling
 * this function, even if the device asserts the interrupt line it will
 * not be propagated further to the processor
 */
int BSP_irq_disable_at_i8259s        (const rtems_irq_symbolic_name irqLine);
/*
 * function to enable a particular irq at 8259 level. After calling
 * this function, if the device asserts the interrupt line it will
 * be propagated further to the processor
 */
int BSP_irq_enable_at_i8259s            (const rtems_irq_symbolic_name irqLine);
/*
 * function to acknoledge a particular irq at 8259 level. After calling
 * this function, if a device asserts an enabled interrupt line it will
 * be propagated further to the processor. Mainly usefull for people
 * writting raw handlers as this is automagically done for rtems managed
 * handlers.
 */
int BSP_irq_ack_at_i8259s               (const rtems_irq_symbolic_name irqLine);
/*
 * function to check if a particular irq is enabled at 8259 level. After calling
 */
int BSP_irq_enabled_at_i8259s           (const rtems_irq_symbolic_name irqLine);
/*
 * ------------------------ RTEMS Single Irq Handler Mngt Routines ----------------
 */
/*
 * function to connect a particular irq handler. This hanlder will NOT be called
 * directly as the result of the corresponding interrupt. Instead, a RTEMS
 * irq prologue will be called that will :
 *
 *      1) save the C scratch registers,
 *      2) switch to a interrupt stack if the interrupt is not nested,
 *      3) store the current i8259s' interrupt masks
 *      4) modify them to disable the current interrupt at 8259 level (and may
 *      be others depending on software priorities)
 *      5) aknowledge the i8259s',
 *      6) demask the processor,
 *      7) call the application handler
 *
 * As a result the hdl function provided
 *
 *      a) can perfectly be written is C,
 *      b) may also well directly call the part of the RTEMS API that can be used
 *      from interrupt level,
 *      c) It only responsible for handling the jobs that need to be done at
 *      the device level including (aknowledging/re-enabling the interrupt at device,
 *      level, getting the data,...)
 *
 *      When returning from the function, the following will be performed by
 *      the RTEMS irq epilogue :
 *
 *      1) masks the interrupts again,
 *      2) restore the original i8259s' interrupt masks
 *      3) switch back on the orinal stack if needed,
 *      4) perform rescheduling when necessary,
 *      5) restore the C scratch registers...
 *      6) restore initial execution flow
 * 
 */
int BSP_install_rtems_irq_handler       (const rtems_irq_connect_data*);
/*
 * function to get the current RTEMS irq handler for ptr->name. It enables to
 * define hanlder chain...
 */
int BSP_get_current_rtems_irq_handler   (rtems_irq_connect_data* ptr);
/*
 * function to get disconnect the RTEMS irq handler for ptr->name.
 * This function checks that the value given is the current one for safety reason.
 * The user can use the previous function to get it.
 */
int BSP_remove_rtems_irq_handler        (const rtems_irq_connect_data*);

/*
 * ------------------------ RTEMS Global Irq Handler Mngt Routines ----------------
 */
/*
 * (Re) Initialize the RTEMS interrupt management.
 *
 * The result of calling this function will be the same as if each individual
 * handler (config->irqHdlTbl[i].hdl)  different from "config->defaultEntry.hdl"
 * has been individualy connected via
 *      BSP_install_rtems_irq_handler(&config->irqHdlTbl[i])
 * And each handler currently equal to config->defaultEntry.hdl
 * has been previously disconnected via
 *       BSP_remove_rtems_irq_handler (&config->irqHdlTbl[i])
 *
 * This is to say that all information given will be used and not just
 * only the space.
 *
 * CAUTION : the various table address contained in config will be used
 *           directly by the interrupt mangement code in order to save
 *           data size so they must stay valid after the call => they should
 *           not be modified or declared on a stack.
 */

int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config);
/*
 * (Re) get info on current RTEMS interrupt management.
 */
int BSP_rtems_irq_mngt_get(rtems_irq_global_settings**);
  
extern void BSP_rtems_irq_mng_init(unsigned cpuId);
extern void BSP_i8259s_init(void);
#endif

#endif