diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/edb7312/irq/irq.h')
| -rw-r--r-- | c/src/lib/libbsp/arm/edb7312/irq/irq.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/edb7312/irq/irq.h b/c/src/lib/libbsp/arm/edb7312/irq/irq.h new file mode 100644 index 0000000000..f8ddcd5d44 --- /dev/null +++ b/c/src/lib/libbsp/arm/edb7312/irq/irq.h @@ -0,0 +1,195 @@ +/* + * Cirrus EP7312 Intererrupt handler + * + * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> + * + * Copyright (c) 2002 by Charlie Steader <charlies@poliac.com> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * + * http://www.OARcorp.com/rtems/license.html. + * + * + * $Id$ +*/ + +#ifndef __IRQ_H__ +#define __IRQ_H__ + +#ifdef __cplusplus +extern "C" { +#endif + + /* define that can be useful (the values are just examples) */ +#define VECTOR_TABLE 0x40 + +#ifndef __asm__ + +/* + * Include some preprocessor value also used by assember code + */ + +#include <rtems.h> + +extern void default_int_handler(); +/*-------------------------------------------------------------------------+ +| Constants ++--------------------------------------------------------------------------*/ + + /* enum of the possible interrupt sources */ +typedef enum { + /* int interrupt status/mask register 1 */ + BSP_EXTFIQ = 0, + BSP_BLINT, + BSP_WEINT, + BSP_MCINT, + BSP_CSINT, + BSP_EINT1, + BSP_EINT2, + BSP_EINT3, + BSP_TC1OI, + BSP_TC2OI, + BSP_RTCMI, + BSP_TINT, + BSP_UTXINT1, + BSP_URXINT1, + BSP_UMSINT, + BSP_SSEOTI, + /* int interrupt status/mask register 2 */ + BSP_KBDINT, + BSP_SS2RX, + BSP_SS2TX, + BSP_UTXINT2, + BSP_URXINT2, + /* int interrupt status/mask register 3 */ + BSP_DAIINT, + BSP_MAX_INT, +} rtems_irq_symbolic_name; + + + +/* + * Type definition for RTEMS managed interrupts + */ +typedef unsigned char rtems_irq_level; +typedef unsigned char rtems_irq_trigger; + +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. + * 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; + /* + * priority level at the vplus level + */ + rtems_irq_level irqLevel; + /* + * Trigger way : Rising or falling edge or High or low level + */ + rtems_irq_trigger irqTrigger; +} rtems_irq_connect_data; + +/*-------------------------------------------------------------------------+ +| Function Prototypes. ++--------------------------------------------------------------------------*/ +/* + * ------------------- RTEMS Single Irq Handler Mngt Routines ---------------- + */ + +/* + * function to initialize the interrupt for a specific BSP + */ +void BSP_rtems_irq_mngt_init(); + + +/* + * 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*); + +#endif /* __asm__ */ + +#ifdef __cplusplus +} +#endif + +#endif /* __IRQ_H__ */ |