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powerpc/mpic: allow coreint to be determined by MPIC version

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This will be used by the qemu-e500 platform, as the MPIC version (and
thus whether we have coreint) depends on how QEMU is configured.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Scott Wood 2013-01-21 19:56:41 -06:00 committed by Kumar Gala
parent 52c5affc54
commit 7c509ee014
1 changed files with 23 additions and 3 deletions
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26
arch/powerpc/sysdev/mpic.c
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@ -1182,6 +1182,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
const char *vers;
const u32 *psrc;
u32 last_irq;
u32 fsl_version = 0;
/* Default MPIC search parameters */
static const struct of_device_id __initconst mpic_device_id[] = {
@ -1314,7 +1315,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
if (mpic->flags & MPIC_FSL) {
u32 brr1, version;
u32 brr1;
int ret;
/*
@ -1327,7 +1328,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs,
MPIC_FSL_BRR1);
version = brr1 & MPIC_FSL_BRR1_VER;
fsl_version = brr1 & MPIC_FSL_BRR1_VER;
/* Error interrupt mask register (EIMR) is required for
* handling individual device error interrupts. EIMR
@ -1342,11 +1343,30 @@ struct mpic * __init mpic_alloc(struct device_node *node,
* is the number of vectors which have been consumed by
* ipis and timer interrupts.
*/
if (version >= 0x401) {
if (fsl_version >= 0x401) {
ret = mpic_setup_error_int(mpic, intvec_top - 12);
if (ret)
return NULL;
}
}
/*
* EPR is only available starting with v4.0. To support
* platforms that don't know the MPIC version at compile-time,
* such as qemu-e500, turn off coreint if this MPIC doesn't
* support it. Note that we never enable it if it wasn't
* requested in the first place.
*
* This is done outside the MPIC_FSL check, so that we
* also disable coreint if the MPIC node doesn't have
* an "fsl,mpic" compatible at all. This will be the case
* with device trees generated by older versions of QEMU.
* fsl_version will be zero if MPIC_FSL is not set.
*/
if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) {
WARN_ON(ppc_md.get_irq != mpic_get_coreint_irq);
ppc_md.get_irq = mpic_get_irq;
}
/* Reset */