diff options
Diffstat (limited to 'bsps/powerpc/ss555/start/irq_init.c')
| -rw-r--r-- | bsps/powerpc/ss555/start/irq_init.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/bsps/powerpc/ss555/start/irq_init.c b/bsps/powerpc/ss555/start/irq_init.c new file mode 100644 index 0000000000..351edb4ffe --- /dev/null +++ b/bsps/powerpc/ss555/start/irq_init.c @@ -0,0 +1,165 @@ +/* + * irq_init.c + * + * This file contains the implementation of rtems initialization + * related to interrupt handling. + */ + +/* + * MPC5xx port sponsored by Defence Research and Development Canada - Suffield + * Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca) + * + * Derived from libbsp/powerpc/mbx8xx/irq/irq_init.c: + * + * CopyRight (C) 2001 valette@crf.canon.fr + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <rtems.h> +#include <mpc5xx.h> +#include <libcpu/vectors.h> +#include <libcpu/raw_exception.h> +#include <bsp/irq.h> + +extern rtems_exception_handler_t dispatch_irq_handler; + +volatile unsigned int ppc_cached_irq_mask; + +/* + * default methods + */ +static void nop_hdl(rtems_irq_hdl_param ignored) +{ +} + +static void nop_irq_enable(const struct __rtems_irq_connect_data__*ignored) +{ +} + +static void nop_raw_enable( + const struct __rtems_raw_except_connect_data__*ignored +) +{ +} + +static int irq_is_connected(const struct __rtems_irq_connect_data__*ignored) +{ + return 0; +} + +static int raw_is_connected(const struct __rtems_raw_except_connect_data__*ignored) +{ + return 0; +} + +static rtems_irq_connect_data rtemsIrq[CPU_IRQ_COUNT]; +static rtems_irq_global_settings initial_config; +static rtems_irq_connect_data defaultIrq = { + 0, /* vector */ + nop_hdl, /* hdl */ + NULL, /* handle */ + nop_irq_enable, /* on */ + nop_irq_enable, /* off */ + irq_is_connected /* isOn */ +}; + +static rtems_irq_prio irqPrioTable[CPU_IRQ_COUNT]={ + /* + * actual priorities for interrupt : + * 0 means that only current interrupt is masked + * 255 means all other interrupts are masked + */ + /* + * USIU interrupts. + */ + 7,7, 6,6, 5,5, 4,4, 3,3, 2,2, 1,1, 0,0, + /* + * UIMB Interrupts + * + * Note that the first 8 UIMB interrupts overlap the 8 external USIU + * interrupts. + */ + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + /* + * Processor exceptions handled as interrupts + */ + 0 +}; + +static void CPU_USIU_irq_init(void) +{ + /* + * In theory we should initialize two registers at least : SIMASK and + * SIEL. SIMASK is reset at 0 value meaning no interrupts. If someone + * find a reasonnable value for SIEL, and the need to change it, please + * feel free to add it here. + */ + ppc_cached_irq_mask = 0; + usiu.simask = ppc_cached_irq_mask; + usiu.sipend = 0xffff0000; + usiu.siel = usiu.siel; +} + +/* + * Initialize UIMB interrupt management + */ +static void CPU_UIMB_irq_init(void) +{ +} + +void CPU_rtems_irq_mng_init(unsigned cpuId) +{ + rtems_raw_except_connect_data vectorDesc; + int i; + + CPU_USIU_irq_init(); + CPU_UIMB_irq_init(); + /* + * Initialize Rtems management interrupt table + */ + /* + * re-init the rtemsIrq table + */ + for (i = 0; i < CPU_IRQ_COUNT; i++) { + rtemsIrq[i] = defaultIrq; + rtemsIrq[i].name = i; + } + /* + * Init initial Interrupt management config + */ + initial_config.irqNb = CPU_IRQ_COUNT; + initial_config.defaultEntry = defaultIrq; + initial_config.irqHdlTbl = rtemsIrq; + initial_config.irqBase = CPU_ASM_IRQ_VECTOR_BASE; + initial_config.irqPrioTbl = irqPrioTable; + + if (!CPU_rtems_irq_mngt_set(&initial_config)) { + /* + * put something here that will show the failure... + */ + rtems_panic("Unable to initialize RTEMS interrupt Management\n"); + } + + /* + * We must connect the raw irq handler for the two + * expected interrupt sources : decrementer and external interrupts. + */ + vectorDesc.exceptIndex = ASM_DEC_VECTOR; + vectorDesc.hdl.vector = ASM_DEC_VECTOR; + vectorDesc.hdl.raw_hdl = dispatch_irq_handler; + vectorDesc.on = nop_raw_enable; + vectorDesc.off = nop_raw_enable; + vectorDesc.isOn = raw_is_connected; + if (!mpc5xx_set_exception (&vectorDesc)) { + rtems_panic("Unable to initialize RTEMS decrementer raw exception\n"); + } + vectorDesc.exceptIndex = ASM_EXT_VECTOR; + vectorDesc.hdl.vector = ASM_EXT_VECTOR; + if (!mpc5xx_set_exception (&vectorDesc)) { + rtems_panic("Unable to initialize RTEMS external raw exception\n"); + } +} |