diff options
Diffstat (limited to 'drivers/staging/tidspbridge/core/ue_deh.c')
| -rw-r--r-- | drivers/staging/tidspbridge/core/ue_deh.c | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/drivers/staging/tidspbridge/core/ue_deh.c b/drivers/staging/tidspbridge/core/ue_deh.c deleted file mode 100644 index e68f0ba8e12b..000000000000 --- a/drivers/staging/tidspbridge/core/ue_deh.c +++ /dev/null @@ -1,272 +0,0 @@ -/* - * ue_deh.c - * - * DSP-BIOS Bridge driver support functions for TI OMAP processors. - * - * Implements upper edge DSP exception handling (DEH) functions. - * - * Copyright (C) 2005-2006 Texas Instruments, Inc. - * Copyright (C) 2010 Felipe Contreras - * - * This package is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -#include <linux/kernel.h> -#include <linux/interrupt.h> - -#include <dspbridge/dbdefs.h> -#include <dspbridge/dspdeh.h> -#include <dspbridge/dev.h> -#include "_tiomap.h" -#include "_deh.h" - -#include <dspbridge/io_sm.h> -#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->bridge_context->resources; - if (!resources) { - dev_dbg(bridge, "%s: Failed to get Host Resources\n", - __func__); - return IRQ_HANDLED; - } - - hw_mmu_event_status(resources->dmmu_base, &event); - if (event == HW_MMU_TRANSLATION_FAULT) { - hw_mmu_fault_addr_read(resources->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->dmmu_base, - HW_MMU_TRANSLATION_FAULT); - } else { - hw_mmu_event_disable(resources->dmmu_base, - HW_MMU_ALL_INTERRUPTS); - } - return IRQ_HANDLED; -} - -int bridge_deh_create(struct deh_mgr **ret_deh, - struct dev_object *hdev_obj) -{ - int status; - struct deh_mgr *deh; - struct bridge_dev_context *hbridge_context = NULL; - - /* Message manager will be created when a file is loaded, since - * size of message buffer in shared memory is configurable in - * the base image. */ - /* Get Bridge context info. */ - dev_get_bridge_context(hdev_obj, &hbridge_context); - /* Allocate IO manager object: */ - deh = kzalloc(sizeof(*deh), GFP_KERNEL); - if (!deh) { - status = -ENOMEM; - goto err; - } - - /* Create an NTFY object to manage notifications */ - deh->ntfy_obj = kmalloc(sizeof(struct ntfy_object), GFP_KERNEL); - if (!deh->ntfy_obj) { - status = -ENOMEM; - goto err; - } - ntfy_init(deh->ntfy_obj); - - /* Create a MMUfault DPC */ - tasklet_init(&deh->dpc_tasklet, mmu_fault_dpc, (u32) deh); - - /* Fill in context structure */ - deh->bridge_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; - -err: - bridge_deh_destroy(deh); - *ret_deh = NULL; - return status; -} - -int bridge_deh_destroy(struct deh_mgr *deh) -{ - if (!deh) - return -EFAULT; - - /* If notification object exists, delete it */ - if (deh->ntfy_obj) { - 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); - - return 0; -} - -int bridge_deh_register_notify(struct deh_mgr *deh, u32 event_mask, - u32 notify_type, - struct dsp_notification *hnotification) -{ - if (!deh) - return -EFAULT; - - if (event_mask) - return ntfy_register(deh->ntfy_obj, hnotification, - event_mask, notify_type); - else - 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->dmmu_base); - hw_mmu_tlb_flush_all(resources->dmmu_base); - - hw_mmu_tlb_add(resources->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->dmmu_base, - HW_MMU_TRANSLATION_FAULT); - dump_dsp_stack(dev_context); - dsp_clk_disable(DSP_CLK_GPT8); - - hw_mmu_disable(resources->dmmu_base); - free_page((unsigned long)dummy_va_addr); -} -#endif - -static inline const char *event_to_string(int event) -{ - switch (event) { - case DSP_SYSERROR: return "DSP_SYSERROR"; break; - case DSP_MMUFAULT: return "DSP_MMUFAULT"; break; - case DSP_PWRERROR: return "DSP_PWRERROR"; break; - case DSP_WDTOVERFLOW: return "DSP_WDTOVERFLOW"; break; - default: return "unknown event"; break; - } -} - -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); - - if (!deh) - return; - - dev_dbg(bridge, "%s: device exception", __func__); - dev_context = deh->bridge_context; - - switch (event) { - case DSP_SYSERROR: - dev_err(bridge, "%s: %s, info=0x%x", __func__, - str, info); -#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE - dump_dl_modules(dev_context); - dump_dsp_stack(dev_context); -#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 - break; - default: - dev_err(bridge, "%s: %s", __func__, str); - break; - } - - /* Filter subsequent notifications when an error occurs */ - if (dev_context->brd_state != BRD_ERROR) { - ntfy_notify(deh->ntfy_obj, event); -#ifdef CONFIG_TIDSPBRIDGE_RECOVERY - bridge_recover_schedule(); -#endif - } - - /* Set the Board state as ERROR */ - dev_context->brd_state = BRD_ERROR; - /* Disable all the clocks that were enabled by DSP */ - dsp_clock_disable_all(dev_context->dsp_per_clks); - /* - * Avoid the subsequent WDT if it happens once, - * also if fatal error occurs. - */ - dsp_wdt_enable(false); -} |