Revert "staging: tidspbridge - fix mmufault support"

This reverts commit f265846db1e755c11498f6f7c011127dfcc5634a.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>

diff --git a/drivers/staging/tidspbridge/core/_deh.h b/drivers/staging/tidspbridge/core/_deh.h
index f1254f0..16723cd 100644 (file)
--- a/drivers/staging/tidspbridge/core/_deh.h
+++ b/drivers/staging/tidspbridge/core/_deh.h
@@ -32,6 +32,4 @@ struct deh_mgr {
        struct tasklet_struct dpc_tasklet;
 };
 
-int mmu_fault_isr(struct iommu *mmu);
-
 #endif /* _DEH_ */

diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index b68050a..d643c2b 100644 (file)
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -57,7 +57,6 @@
 #include "_tiomap.h"
 #include "_tiomap_pwr.h"
 #include "tiomap_io.h"
-#include "_deh.h"
 
 /* Offset in shared mem to write to in order to synchronize start with DSP */
 #define SHMSYNCOFFSET 4                /* GPP byte offset */
@@ -380,7 +379,6 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
        }
        if (!status) {
                dev_context->dsp_mmu = mmu;
-               mmu->isr = mmu_fault_isr;
                sm_sg = &dev_context->sh_s;
                sg0_da = iommu_kmap(mmu, sm_sg->seg0_da, sm_sg->seg0_pa,
                        sm_sg->seg0_size, IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_32);

diff --git a/drivers/staging/tidspbridge/core/ue_deh.c b/drivers/staging/tidspbridge/core/ue_deh.c
index 2e1ac89..14f3191 100644 (file)
--- a/drivers/staging/tidspbridge/core/ue_deh.c
+++ b/drivers/staging/tidspbridge/core/ue_deh.c
@@ -31,7 +31,7 @@
 #include <dspbridge/drv.h>
 #include <dspbridge/wdt.h>
 
-#define MMU_CNTL_TWL_EN                (1 << 2)
+static u32 fault_addr;
 
 static void mmu_fault_dpc(unsigned long data)
 {
@@ -43,18 +43,43 @@ static void mmu_fault_dpc(unsigned long data)
        bridge_deh_notify(deh, DSP_MMUFAULT, 0);
 }
 
-int mmu_fault_isr(struct iommu *mmu)
+static irqreturn_t mmu_fault_isr(int irq, void *data)
 {
-       struct deh_mgr *dm;
+       struct deh_mgr *deh = data;
+       struct cfg_hostres *resources;
+       u32 event;
 
-       dev_get_deh_mgr(dev_get_first(), &dm);
+       if (!deh)
+               return IRQ_HANDLED;
 
-       if (!dm)
-               return -EPERM;
+       resources = deh->hbridge_context->resources;
+       if (!resources) {
+               dev_dbg(bridge, "%s: Failed to get Host Resources\n",
+                               __func__);
+               return IRQ_HANDLED;
+       }
 
-       iommu_write_reg(mmu, 0, MMU_IRQENABLE);
-       tasklet_schedule(&dm->dpc_tasklet);
-       return 0;
+       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,
@@ -136,45 +161,42 @@ int bridge_deh_register_notify(struct deh_mgr *deh, u32 event_mask,
 #ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
 static void mmu_fault_print_stack(struct bridge_dev_context *dev_context)
 {
-       void *dummy_addr;
-       u32 fa, tmp;
-       struct iotlb_entry e;
-       struct iommu *mmu = dev_context->dsp_mmu;
-       dummy_addr = (void *)__get_free_page(GFP_ATOMIC);
+       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.
         */
-       tmp = iommu_read_reg(mmu, MMU_CNTL);
-       tmp &= ~MMU_CNTL_TWL_EN;
-       iommu_write_reg(mmu, tmp, MMU_CNTL);
-       fa = iommu_read_reg(mmu, MMU_FAULT_AD);
-       e.da = fa & PAGE_MASK;
-       e.pa = virt_to_phys(dummy_addr);
-       e.valid = 1;
-       e.prsvd = 1;
-       e.pgsz = IOVMF_PGSZ_4K & MMU_CAM_PGSZ_MASK;
-       e.endian = MMU_RAM_ENDIAN_LITTLE;
-       e.elsz = MMU_RAM_ELSZ_32;
-       e.mixed = 0;
-
-       load_iotlb_entry(dev_context->dsp_mmu, &e);
+       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 */
-       tmp = iommu_read_reg(mmu, MMU_IRQSTATUS);
-       iommu_write_reg(mmu, tmp, MMU_IRQSTATUS);
-
+       hw_mmu_event_ack(resources->dw_dmmu_base,
+                       HW_MMU_TRANSLATION_FAULT);
        dump_dsp_stack(dev_context);
        dsp_clk_disable(DSP_CLK_GPT8);
 
-       iopgtable_clear_entry(mmu, fa);
-       free_page((unsigned long)dummy_addr);
+       hw_mmu_disable(resources->dw_dmmu_base);
+       free_page((unsigned long)dummy_va_addr);
 }
 #endif
 
@@ -193,7 +215,6 @@ void bridge_deh_notify(struct deh_mgr *deh, int event, int info)
 {
        struct bridge_dev_context *dev_context;
        const char *str = event_to_string(event);
-       u32 fa;
 
        if (!deh)
                return;
@@ -211,8 +232,8 @@ void bridge_deh_notify(struct deh_mgr *deh, int event, int info)
 #endif
                break;
        case DSP_MMUFAULT:
-               fa = iommu_read_reg(dev_context->dsp_mmu, MMU_FAULT_AD);
-               dev_err(bridge, "%s: %s, addr=0x%x", __func__, str, fa);
+               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);