diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mvme3100/irq/irq_init.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mvme3100/irq/irq_init.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/mvme3100/irq/irq_init.c b/c/src/lib/libbsp/powerpc/mvme3100/irq/irq_init.c new file mode 100644 index 0000000000..9b474899b7 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/mvme3100/irq/irq_init.c @@ -0,0 +1,140 @@ +/* irq_init.c + * + * This file contains the implementation of rtems initialization + * related to interrupt handling. + * + * CopyRight (C) 1999 valette@crf.canon.fr + * + * Enhanced by Jay Kulpinski <jskulpin@eng01.gdds.com> + * to make it valid for MVME2300 Motorola boards. + * + * Till Straumann <strauman@slac.stanford.edu>, 12/20/2001: + * Use the new interface to openpic_init + * + * Adapted for the mvme3100 BSP by T. Straumann, 2007. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#include <libcpu/io.h> +#include <bsp/pci.h> +#include <bsp/openpic.h> +#include <bsp/irq.h> +#include <bsp.h> +#include <libcpu/raw_exception.h> +#include <rtems/bspIo.h> + +static void nop_func() +{ + printk("Unhandled IRQ\n"); +} + +static rtems_irq_connect_data rtemsIrq[BSP_IRQ_NUMBER]; +static rtems_irq_global_settings initial_config; +static rtems_irq_connect_data defaultIrq = { + /* vectorIdex, hdl , handle , on , off , isOn */ + 0, nop_func , NULL , 0 , 0 , 0 +}; + +static rtems_irq_prio irqPrioTable[BSP_IRQ_NUMBER]={ + /* + * actual priorities for interrupt : + * 0 means that only current interrupt is masked + * 255 means all other interrupts are masked + */ + /* + * PCI Interrupts + */ + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */ + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */ + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */ + /* + * Processor exceptions handled as interrupts + */ + 0 +}; + + /* + * This code assumes the exceptions management setup has already + * been done. We just need to replace the exceptions that will + * be handled like interrupt. On mcp750/mpc750 and many PPC processors + * this means the decrementer exception and the external exception. + */ +void BSP_rtems_irq_mng_init(unsigned cpuId) +{ + /* We should really have a way to find the number of sources + * the driver will use so that the size of the polarity-array + * matches the driver's idea of it. + */ + unsigned char pol[56]; + int i; + + /* Note: The openpic driver initializes only as many + * 'pic-external' interrupt sources as reported + * by the feature register. + * The 8540's openpic supports 12 core-external + * and 23 core-internal (both of these groups + * are external to the PIC, i.e., 'pic-external') + * interrupts but between the corresponding + * banks of vector/priority registers there is + * a gap leaving space for 4 (unsupported) irqs. + * The driver, not knowing of this gap, would + * initialize the 12 core-external sources + * followed by 4 unsupported sources and 19 + * core-internal sources thus leaving the last + * four core-internal sources uninitialized. + * Luckily, the feature register reports + * too many sources: + * - the 4 IPI plus 4 timer plus 4 messaging + * sources are included with the count + * - there are unused core-internal sources 24..32 + * which are also supported by the pic + * bringing the reported number of sources to + * a count of 56 (12+32+4+4+4) which is enough + * so that all pic-external sources are covered + * and initialized. + * + * NOTE: All core-internal sources are active-high. + * The manual says that setting the polarity + * to 'low/0' will disable the interrupt but + * I found this not to be true: on the device + * I tested the interrupt was asserted hard. + */ + + /* core-external sources on the mvme3100 are active-low, + * core-internal sources are active high. + */ + for (i=0; i<BSP_EXT_IRQ_NUMBER; i++) + pol[i]=0; + for (i=BSP_EXT_IRQ_NUMBER; i< BSP_EXT_IRQ_NUMBER + BSP_CORE_IRQ_NUMBER; i++) + pol[i]=1; + + openpic_init(1, pol, 0, 0, 0, 0); + + /* + * re-init the rtemsIrq table + */ + for (i = 0; i < BSP_IRQ_NUMBER; i++) { + rtemsIrq[i] = defaultIrq; + rtemsIrq[i].name = i; + } + /* + * Init initial Interrupt management config + */ + initial_config.irqNb = BSP_IRQ_NUMBER; + initial_config.defaultEntry = defaultIrq; + initial_config.irqHdlTbl = rtemsIrq; + initial_config.irqBase = BSP_LOWEST_OFFSET; + initial_config.irqPrioTbl = irqPrioTable; + + if (!BSP_rtems_irq_mngt_set(&initial_config)) { + /* + * put something here that will show the failure... + */ + BSP_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n"); + } +} |