Commit 05cf2079 authored by Jaidev Patwardhan's avatar Jaidev Patwardhan Committed by Ralf Baechle

MIPS: GCMP: Avoid accessing registers when they are not present

Signed-off-by: default avatarChris Dearman <chris@mips.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7098f748
......@@ -411,6 +411,11 @@ static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
*/
int __init gcmp_probe(unsigned long addr, unsigned long size)
{
if (mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) {
gcmp_present = 0;
return gcmp_present;
}
if (gcmp_present >= 0)
return gcmp_present;
......@@ -479,9 +484,14 @@ void __init arch_init_irq(void)
GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
gic_present = 1;
} else {
_msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
MSC01_SC_CFG_GICPRES_MSK) >> MSC01_SC_CFG_GICPRES_SHF;
if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
_msc01_biu_base = (unsigned long)
ioremap_nocache(MSC01_BIU_REG_BASE,
MSC01_BIU_ADDRSPACE_SZ);
gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
MSC01_SC_CFG_GICPRES_MSK) >>
MSC01_SC_CFG_GICPRES_SHF;
}
}
if (gic_present)
pr_debug("GIC present\n");
......
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