diff options
| -rw-r--r-- | sys/arm/freescale/imx/imx6_machdep.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_machdep.c b/sys/arm/freescale/imx/imx6_machdep.c index 1abbd6c..061355d 100644 --- a/sys/arm/freescale/imx/imx6_machdep.c +++ b/sys/arm/freescale/imx/imx6_machdep.c @@ -94,6 +94,74 @@ fdt_pic_decode_t fdt_pic_table[] = { }; #endif +/* + * Fix FDT data related to interrupts. + * + * Driven by the needs of linux and its drivers (as always), the published FDT + * data for imx6 now sets the interrupt parent for most devices to the GPC + * interrupt controller, which is for use when the chip is in deep-sleep mode. + * We don't support deep sleep or have a GPC-PIC driver; we need all interrupts + * to be handled by the GIC. + * + * Luckily, the change to the FDT data was to assign the GPC as the interrupt + * parent for the soc node and letting that get inherited by all other devices + * (except a few that directly name GIC as their interrupt parent). So we can + * set the world right by just changing the interrupt-parent property of the soc + * node to refer to GIC instead of GPC. This will get us by until we write our + * own GPC driver (or until linux changes its mind and the FDT data again). + * + * We validate that we have data that looks like we expect before changing it: + * - SOC node exists and has GPC as its interrupt parent. + * - GPC node exists and has GIC as its interrupt parent. + * - GIC node exists and is its own interrupt parent. + * + * This applies to all models of imx6. Luckily all of them have the devices + * involved at the same addresses on the same busses, so we don't need any + * per-soc logic. We handle this at platform attach time rather than via the + * fdt_fixup_table, because the latter requires matching on the FDT "model" + * property, and this applies to all boards including those not yet invented. + */ +static void +fix_fdt_interrupt_data(void) +{ + phandle_t gicipar, gicnode, gicxref; + phandle_t gpcipar, gpcnode, gpcxref; + phandle_t socipar, socnode; + int result; + + socnode = OF_finddevice("/soc"); + if (socnode == -1) + return; + result = OF_getencprop(socnode, "interrupt-parent", &socipar, + sizeof(socipar)); + if (result <= 0) + return; + + gicnode = OF_finddevice("/soc/interrupt-controller@00a01000"); + if (gicnode == -1) + return; + result = OF_getencprop(gicnode, "interrupt-parent", &gicipar, + sizeof(gicipar)); + if (result <= 0) + return; + gicxref = OF_xref_from_node(gicnode); + + gpcnode = OF_finddevice("/soc/aips-bus@02000000/gpc@020dc000"); + if (gpcnode == -1) + return; + result = OF_getencprop(gpcnode, "interrupt-parent", &gpcipar, + sizeof(gpcipar)); + if (result <= 0) + return; + gpcxref = OF_xref_from_node(gpcnode); + + if (socipar != gpcxref || gpcipar != gicxref || gicipar != gicxref) + return; + + gicxref = cpu_to_fdt32(gicxref); + OF_setprop(socnode, "interrupt-parent", &gicxref, sizeof(gicxref)); +} + static vm_offset_t imx6_lastaddr(platform_t plat) { @@ -104,6 +172,10 @@ imx6_lastaddr(platform_t plat) static int imx6_attach(platform_t plat) { + + /* Fix soc interrupt-parent property. */ + fix_fdt_interrupt_data(); + /* Inform the MPCore timer driver that its clock is variable. */ arm_tmr_change_frequency(ARM_TMR_FREQUENCY_VARIES); |
