1 files changed, 1 insertions, 114 deletions

diff --git a/drivers/staging/tidspbridge/core/ue_deh.c b/drivers/staging/tidspbridge/core/ue_deh.c
index 3430418..e24ea0c 100644
--- a/drivers/staging/tidspbridge/core/ue_deh.c
+++ b/drivers/staging/tidspbridge/core/ue_deh.c
@@ -31,57 +31,6 @@
 #include <dspbridge/drv.h>
 #include <dspbridge/wdt.h>
 
-static u32 fault_addr;
-
-static void mmu_fault_dpc(unsigned long data)
-{
-	struct deh_mgr *deh = (void *)data;
-
-	if (!deh)
-		return;
-
-	bridge_deh_notify(deh, DSP_MMUFAULT, 0);
-}
-
-static irqreturn_t mmu_fault_isr(int irq, void *data)
-{
-	struct deh_mgr *deh = data;
-	struct cfg_hostres *resources;
-	u32 event;
-
-	if (!deh)
-		return IRQ_HANDLED;
-
-	resources = deh->hbridge_context->resources;
-	if (!resources) {
-		dev_dbg(bridge, "%s: Failed to get Host Resources\n",
-				__func__);
-		return IRQ_HANDLED;
-	}
-
-	hw_mmu_event_status(resources->dw_dmmu_base, &event);
-	if (event == HW_MMU_TRANSLATION_FAULT) {
-		hw_mmu_fault_addr_read(resources->dw_dmmu_base, &fault_addr);
-		dev_dbg(bridge, "%s: event=0x%x, fault_addr=0x%x\n", __func__,
-				event, fault_addr);
-		/*
-		 * Schedule a DPC directly. In the future, it may be
-		 * necessary to check if DSP MMU fault is intended for
-		 * Bridge.
-		 */
-		tasklet_schedule(&deh->dpc_tasklet);
-
-		/* Disable the MMU events, else once we clear it will
-		 * start to raise INTs again */
-		hw_mmu_event_disable(resources->dw_dmmu_base,
-				HW_MMU_TRANSLATION_FAULT);
-	} else {
-		hw_mmu_event_disable(resources->dw_dmmu_base,
-				HW_MMU_ALL_INTERRUPTS);
-	}
-	return IRQ_HANDLED;
-}
-
 int bridge_deh_create(struct deh_mgr **ret_deh,
 		struct dev_object *hdev_obj)
 {
@@ -109,18 +58,9 @@ int bridge_deh_create(struct deh_mgr **ret_deh,
 	}
 	ntfy_init(deh->ntfy_obj);
 
-	/* Create a MMUfault DPC */
-	tasklet_init(&deh->dpc_tasklet, mmu_fault_dpc, (u32) deh);
-
 	/* Fill in context structure */
 	deh->hbridge_context = hbridge_context;
 
-	/* Install ISR function for DSP MMU fault */
-	status = request_irq(INT_DSP_MMU_IRQ, mmu_fault_isr, 0,
-			"DspBridge\tiommu fault", deh);
-	if (status < 0)
-		goto err;
-
 	*ret_deh = deh;
 	return 0;
 
@@ -140,11 +80,6 @@ int bridge_deh_destroy(struct deh_mgr *deh)
 		ntfy_delete(deh->ntfy_obj);
 		kfree(deh->ntfy_obj);
 	}
-	/* Disable DSP MMU fault */
-	free_irq(INT_DSP_MMU_IRQ, deh);
-
-	/* Free DPC object */
-	tasklet_kill(&deh->dpc_tasklet);
 
 	/* Deallocate the DEH manager object */
 	kfree(deh);
@@ -166,48 +101,6 @@ int bridge_deh_register_notify(struct deh_mgr *deh, u32 event_mask,
 		return ntfy_unregister(deh->ntfy_obj, hnotification);
 }
 
-#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
-static void mmu_fault_print_stack(struct bridge_dev_context *dev_context)
-{
-	struct cfg_hostres *resources;
-	struct hw_mmu_map_attrs_t map_attrs = {
-		.endianism = HW_LITTLE_ENDIAN,
-		.element_size = HW_ELEM_SIZE16BIT,
-		.mixed_size = HW_MMU_CPUES,
-	};
-	void *dummy_va_addr;
-
-	resources = dev_context->resources;
-	dummy_va_addr = (void*)__get_free_page(GFP_ATOMIC);
-
-	/*
-	 * Before acking the MMU fault, let's make sure MMU can only
-	 * access entry #0. Then add a new entry so that the DSP OS
-	 * can continue in order to dump the stack.
-	 */
-	hw_mmu_twl_disable(resources->dw_dmmu_base);
-	hw_mmu_tlb_flush_all(resources->dw_dmmu_base);
-
-	hw_mmu_tlb_add(resources->dw_dmmu_base,
-			virt_to_phys(dummy_va_addr), fault_addr,
-			HW_PAGE_SIZE4KB, 1,
-			&map_attrs, HW_SET, HW_SET);
-
-	dsp_clk_enable(DSP_CLK_GPT8);
-
-	dsp_gpt_wait_overflow(DSP_CLK_GPT8, 0xfffffffe);
-
-	/* Clear MMU interrupt */
-	hw_mmu_event_ack(resources->dw_dmmu_base,
-			HW_MMU_TRANSLATION_FAULT);
-	dump_dsp_stack(dev_context);
-	dsp_clk_disable(DSP_CLK_GPT8);
-
-	hw_mmu_disable(resources->dw_dmmu_base);
-	free_page((unsigned long)dummy_va_addr);
-}
-#endif
-
 static inline const char *event_to_string(int event)
 {
 	switch (event) {
@@ -240,13 +133,7 @@ void bridge_deh_notify(struct deh_mgr *deh, int event, int info)
 #endif
 		break;
 	case DSP_MMUFAULT:
-		dev_err(bridge, "%s: %s, addr=0x%x", __func__,
-				str, fault_addr);
-#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
-		print_dsp_trace_buffer(dev_context);
-		dump_dl_modules(dev_context);
-		mmu_fault_print_stack(dev_context);
-#endif
+		dev_err(bridge, "%s: %s, addr=0x%x", __func__, str, info);
 		break;
 	default:
 		dev_err(bridge, "%s: %s", __func__, str);