[PATCH] ppc32: explicitly disable 440GP IRQ compatibility mode in 440…

…GX setup Add explicit disabling of 440GP IRQ compatibility mode when configuring 440GX interrupt controller. This helps when board firmware for some reason uses this compatibility mode and leaves it enabled. It breaks 440GX interrupt code because it assumes native 440GX IRQ mode. People seems to be continuously bitten by this. Signed-off-by: Eugene Surovegin <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
benxu · Jul 6, 2005 · 4b1294f · 4b1294f
1 parent f326d22
commit 4b1294f
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arch/ppc/syslib/ppc4xx_pic.c b/arch/ppc/syslib/ppc4xx_pic.c
@@ -110,6 +110,10 @@ static int ppc4xx_pic_get_irq(struct pt_regs *regs)
 
 static void __init ppc4xx_pic_impl_init(void)
 {
+#if defined(CONFIG_440GX)
+	/* Disable 440GP compatibility mode if it was enabled in firmware */
+	SDR_WRITE(DCRN_SDR_MFR, SDR_READ(DCRN_SDR_MFR) & ~DCRN_SDR_MFR_PCM);
+#endif
 	/* Configure Base UIC */
 	mtdcr(DCRN_UIC_CR(UICB), 0);
 	mtdcr(DCRN_UIC_TR(UICB), 0);